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Permit PL16-0037 - CITY OF TUKWILA / PUBLIC WORKS - SURFACE WATER CODE AMENDMENTS CHECKLIST
SURFACE WATER CODE AMENDMENTS SITE APN: PROJ-00007 RECEIVED PARENT PROJECT NO: PL16-0037 PROJECT NO: L16-0050 STATE OF WASHIilGT©id DEPARTMENT OF COW ERCE 1011 Plum Street SE • PO Box 42525 • O.fmp a, Wash.n ion 98504-2525 • (360j 725-4000 tcx,"7.c0mmerce.t a.gov December 8, 2016 Moira Carr Bradshaw Senior Planner City of Tukwila 6200 Southcenter Boulevard Tukwila , Washington 98188 Dear Ms. Carr Bradshaw: Thank you for sending the Washington State Department of Commerce (Commerce) the following materials as required under RCW 36.70A.106. Please keep this letter as documentation that you have met this procedural requirement. City of Tukwila - Adopted amendments to the development regulations Municlipal Code 14, 16 and 18 are to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution -generating activities. The changes are intended to: 1. Provide better protection of environmental resources and private property, and 2. Meet the intent of requirements of the GMA, the Clean Water Act and Tukwila's Municipal Stormwater permit. The proposed changes adopt King County's new Surface Water Design Manual and incorporate low impact development standards throughout the City's development regulations. These materials were received on December 07, 2016 and processed with the Material ID # 23160. We have forwarded a copy of this notice to other state agencies. If this submitted material is an adopted amendment, then please keep this letter as documentation that you have met the procedural requirement under RCW 36.70A.106. If you have submitted this material as a draft amendment, then final adoption may occur no earlier than February 05, 2017. Please remember to submit the final adopted amendment to Commerce within ten (10) days of adoption. If you have any questions, please contact Growth Management Services at reviewteam@commerce.wa.gov, or call Dave Andersen (509) 434-4491. Sincerely, Review Team Growth Management Services -4,-- A----- ILA -I �,n\ /2 `� 1908! "- ` Monday, December Tukwi/a City Council Agenda • •REGULAR MEETING •♦• Allan Ekberg, Mayor Couna%/members. ❖ Dennis Robertson ❖ Verna Seal David Cline, City Administrator ❖ Kathy Hougardy ❖ De'Sean Quinn Joe Duffie, Council President ❖ Kate Kruller ❖ Thomas McLeod 5, 2016; 7:00 PM • Ord #2515 • Res #1899 1. CALL TO ORDER / PLEDGE OF ALLEGIANCE / ROLL CALL 2. PROCLAMATION A proclamation proclaiming December 10, 2016 as "Seattle Sounders FC Spirit Day." Pg.1 3. CITIZEN COMMENT At this time, you are invited to comment on items not included on this agenda (please limit your comments to five minutes per citizen). To comment on an item listed on this agenda, please save your comments until the issue is presented for discussion. (Refer to back of agenda page for additional information.) 4. CONSENT AGENDA a. Approval of Minutes: 11/21/16 (Regular) b. Approval of Vouchers c. A resolution expressing the City Council's support for regional transfer of development rights and the City Council's willingness to consider, at the appropriate time, developing an Interlocal Agreement with King County to establish a Landscape Conservation and Local Infrastructure Program that includes transfer of development rights policies. [Reviewed and forwarded to Consent by the Committee of the Whole on 11/28/16.J d. Accept as complete the 2016 Overlay and Repair Program (contract #16-070) with Lakeside Industries, Inc. of Kent; authorize release of retainage, subject to the standard claim and lien release procedures (final cost of project, including retainage: $1,098,062.24). [Reviewed and forwarded to Consent by the Transportation Committee on 11/21/16. J e. Authorize the Mayor to sign an Interagency Agreement with King County for Baker Boulevard and Christensen Road non -motorized improvements. (Funding through $1,000,000 in King County grant funds) [Reviewed and forwarded to Consent by the Transportation Committee on 11/21/16.J f. Authorize the Mayor to sign Supplement #1 to contract #16-053 with Transpo Group USA, Inc., for the ADA Transition Plan in the amount of $15,700 for a revised contract total of $43,500. [Reviewed and forwarded to Consent by the Transportation Committee on 11/21/16.J g. Authorize the Mayor to sign a contract with Summit Strategies Government Affairs, LLC, for 2017-2018 federal and legislative services in an amount not to exceed $80,000 a year. [Reviewed and forwarded to Consent by the Finance and Safety Committee on 11/22/16. J h. Authorize the Mayor to sign a contract with Total Destination Marketing for branding for the City's day marketing campaign in an amount not to exceed $105,075. [Reviewed and forwarded to Consent by the Finance and Safety Committee on 11/22/16.J (continued...) Pg.3 Pg.9 Pg.17 Pg.55 Pg.63 Pg.77 REGULAR MEETING Monday, December 5, 2016 Page 2 4. CONSENT AGENDA (cont.) i. Authorize the Mayor to sign a contract with Kenyon Disend, PLLC, for 2017-2018 legal services in an amount not to exceed $46,436 per month, plus expenses. [Reviewed and forwarded to Consent by the Finance and Safety Committee on 11/22/16. J j. Authorize the Mayor to sign a contract with Kirshenbaum & Goss, Inc., P.S., for 2017-2018 public defender services in an amount not to exceed $32,600 per month. [Reviewed and forwarded to Consent by the Finance and Safety Committee on 11/22/16.J k. Authorize the Mayor to sign a contract with King County for Community Development Block Grant (CDBG) funds for the 2016 Minor Home Repair Program. [Reviewed and forwarded to Consent by the Community Affairs and Parks Committee on 11/28/161 I. Authorize the Mayor to sign an amendment to contract #15-156 with Forterra for services at Duwamish Hill Preserve in the amount of $7,500 for a revised contract total not to exceed $45,000. [Reviewed and forwarded to Consent by the Community Affairs and Parks Committee on 11/28/16.J m. Authorize the Mayor to sign a contract with B-Force Protection for park security services in the amount of $50,400. [Reviewed and forwarded to Consent by the Community Affairs and Parks Committee on 11/28/16.J n. Accept as complete the Urban Renewal/Motel Demolition Project (contract #15-202) with Construction Group Internatlional, LLC, of Woodinville; authorize release of retainage, subject to the standard claim and lien release procedures (final cost of project, including retainage: $636,194.04). [Reviewed and forwarded to Consent by the Community Affairs and Parks Committee on 11/28/16. J Pg.117 Pg.131 Pg.147 Pg.203 Pg.219 Pg.231 5. UNFINISHED BUSINESS a. A resolution reaffirming Tukwila's commitment to being a diverse, tolerant and inclusive City. b. Budget legislation: (1) An ordinance adopting the biennial budget for the 2017-2018 biennium. (2) A resolution adopting the 2017-2022 Financial Planning Model and the Capital Improvement Program for general government and the City's enterprise funds. c. A resolution accepting the donation of certain real property to the City of Tukwila by Gregory S. Sarantos and Peter Sarantos. d. Authorize the Mayor to sign a non -binding statement of intent to enter into an Interlocal Agreement with Regional Animal Services of King County (RASKC) beginning January 1, 2018 (based on Agreement in Principle dated September 1, 2016). P/ease refer to 11/28/16 C.O.W. packet. Q (continued..) Pg.239 Pg.251 Pg.253 Pg.257 Pg.259 Pg.269 REGULAR MEETING Monday, December 5, 2016 Page 3 5. UNFINISHED BUSINESS (cont.) e. Code changes: (1) An ordinance updating regulations regarding surface water management, establishing a new section entitled "Trash and Waste Receptacles." (TMC Title 14) (2) An ordinance related to low impact development requirements, establishing two new sections entitled "Permit Application Requirements" and "Seasonal Limitation Period." (TMC Title 16) (3) An ordinance implementing low impact development requirements in the design and review of surface water drainage on development projects. (TMC Titles 8 and 18) f. An ordinance to update Tukwila's Residential Rental Business License and Inspection Program requirements. g. Affordable housing legislation: (1) An ordinance reducing development and land use fees for certain affordable housing projects as codified in Tukwila Municipal Code Chapters 16.04, 16.54 and 18.88. (2) An ordinance establishing regulations for a residential impact fee deferral to be codified in Tukwila Municipal Code Chapters 9.48, 16.25 and 16.28. Pg.271 Pg.273 Pg.281 Pg.291 Pg.309 Pg.317 Pg.319 Pg.325 6. NEW BUSINESS a. Authorize the Mayor to sign a 2017-2018 lease agreement with Alliance One Receivables Management, Inc., for use of space in the Municipal Court in the amount of $900.00 per month paid to the City of Tukwila. b. Authorize the utilization of Lodging Tax Funds for Seattle Sounders FC events in the amount of $30,000. Pg.339 Pg.349 7. REPORTS a. Mayor b. City Council c. Staff - City Administrator Report d. City Attorney e. Intergovernmental Pg.351 8. MISCELLANEOUS 9. EXECUTIVE SESSION 10. ADJOURNMENT Tukwila City Hall is ADA accessible. Reasonable accommodations are available at public hearings with advance notice to the City Clerk's Office (206-433-1800 or TukwilaCityClerk@TukwilaWA.gov). This agenda is available at www.tukwilawa.gov, and in alternate formats with advance notice for those with disabilities. Tukwila Council meetings are audio/video taped (available at www.tukwilawa.gov) City of Tukwila Washington Ordinance No. AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 1 of 18 WHEREAS, Section S5.C.4 of the Permit requires the City to implement and enforce a program to reduce pollutants in stormwater runoff by regulating new development, redevelopment and construction sites; and WHEREAS, a requirement of Section S5.C.4 of the Permit mandates the City reduce pollutants in stormwater by implementing Low Impact Development (LID) requirements through new and revised development codes by December 31, 2016; and WHEREAS, the City Council deems it necessary to update the code provisions in Title 8, "Public Peace, Morals and Safety," and Title 18, "Zoning," to remain in compliance with the Permit; and WHEREAS, on October 27, 2016, the Tukwila Planning Commission, following adequate public notice, held a public hearing to receive testimony concerning amending the Tukwila Municipal Code and at that meeting adopted a motion recommending the proposed changes; and WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing to receive testimony concerning the recommendations of the Planning Commission; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. Repealer. Ordinance Nos. 2495, 2371, 2251 §1 (part), and 2056, as codified at Tukwila Municipal Code (TMC) Chapter 8.25, are hereby repealed, thereby eliminating TMC Chapter 8.25, "Vehicle Storage and Parking on Single -Family Residential Property," in its entirety. Section 2. Repealer. Ordinance Nos. 2075 §1 (part) and 1758 §1 (part), as codified at TMC Section 18.06.515, "Lot Coverage" (definition), are hereby repealed, thereby eliminating TMC Section 18.06.515. Section 3. TMC Chapter 18.06, "Definitions," Amended. Ordinance Nos. 2075 §1 (part) and 1758 §1 (part), as codified at TMC Section 18.06.215, "Development Area," are hereby amended to read as follows: 18.06.215 Development Area "Development area" means the impervious surface area plus 75% of any area of pervious hard surface. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 2 of 18 Section 4. TMC Chapter 18.06, "Definitions," Amended. Ordinance No. 2347 §21, as codified at TMC Section 18.06.586, "Native Vegetation," is hereby amended to read as follows: 18.06.586 Native Vegetation "Native vegetation" means plant species, other than noxious weeds, that are indigenous to the coastal region of the Pacific Northwest and that reasonably could be expected to have occurred naturally on the site. Section 5. New Definition Adopted. A new section is hereby added to TMC Chapter 18.06, "Definitions," to read as follows: Durable Uniform Surface "Durable uniform surface" means a durable uniform surface approved for the storage of vehicles by the City and consists of: 1. Permeable pavement, such as grasscrete, porous pavers, permeable asphalt; or 2. Three inches of 3/8" to 1-1/4" crushed porous aggregate consisting of open - graded top course, base course, or similar material with 35-40% porosity. Mud or other fine materials should be prevented from working their way to the surface by the installation of a geotextile fabric, quarry spalls, or other approved materials below the porous aggregate; or 3. Concrete (4" minimum Portland cement concrete) over gravel section as described above and sloped to drain to prevent drainage impacts; or 4. Blacktop (2" minimum asphalt concrete pavement) over gravel section as described above and sloped to drain to prevent drainage impacts; or 5. Any other configuration of materials approved by the City that maintains a durable uniform surface and prevents drainage impacts. Section 6. New Definition Adopted. A new section is hereby added to TMC Chapter 18.06, "Definitions," to read as follows: Pervious Hard Surface "Pervious hard surface" means permeable pavement or a green roof. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 3 of 18 Section 7. TMC Section 18.10.060 Amended. Ordinance Nos. 1971 §4 and 1758 §1 (part), as codified at TMC Section 18.10.060, "Basic Development Standards," are hereby amended to read as follows: 18.10.060 Basic Development Standards Development within the Low -Density Residential District shall conform to the following listed and referenced standards: LDR BASIC DEVELOPMENT STANDARDS Lot area, minimum 6,500 sq. ft. Average lot width (min. 20 ft. street frontage width), minimum 50 feet Development Area, maximum (only for single family development) 75% on lots less than 13,000 sq. ft. up to a maximum of 5,850 sq. ft_ 45% on lots greater than or equal to 13,000 sq. ft. Setbacks to yards (minimum): • Front 20 feet • Front, decks or porches 15 feet • Second front 10 feet • Sides 5 feet • Rear 10 feet Height, maximum 30 feet Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See 18.10.030 • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 4 of 18 Section 8. TMC Section 18.20.080 Amended. Ordinance Nos. 1976 §39, 1872 §3, and 1758 §1 (part), as codified at TMC Section 18.20.080, "Basic Development Standards," are hereby amended to read as follows: 18.20.080 Basic Development Standards Development within the Residential Commercial Center District shall conform to the following listed and referenced standards: RCC BASIC DEVELOPMENT STANDARDS Lot area, minimum 5,000 sq. ft. Lot area per unit (multi -family), minimum 3,000 sq. ft. Setbacks to yards (min.): • Front 20 feet • Second front 10 feet • Sides 5 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear 10 feet Height, maximum 3 stories or 35 feet Landscape requirements (minimum): All setback areas shall be landscaped. Required landscaping may include a mix of plant materials, bioretention facilities, pedestrian amenities and features, outdoor cafe -type seating and similar features, subject to approval. See Landscape, Recreation, Recycling/Solid Waste Space chapter for further requirements • Front 20 feet • Second front 10 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet Recreation space 200 sq. ft. per dwelling unit (1,000 sq. ft. min.) W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 5 of 18 / Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See Accessory Use section of this chapter • Office, minimum 3 per 1,000 sq. ft. usable floor area • Retail, minimum 2.5 per 1,000 sq. ft. usable floor area • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations Performance Standards: Use, activity and operations within a structure or a site shall comply with (1) standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, (2) TMC Chapter 8.22, "Noise", and (3) adopted State and Federal standards for water quality and hazardous materials. In addition, all development subject to the requirements of the State Environmental Policy Act, RCW 43.21 C, shall be evaluated to determine whether adverse environmental impacts have been adequately mitigated. Section 9. TMC Section 18.28.240 Amended. Ordinance No. 2443 §25, as codified at TMC Section 18.28.240, "General Landscaping," subparagraph B.3., "Soil Preparation and Planting," is hereby amended to read as follows: 18.28.240 General Landscaping 3. Soil Preparation and Planting. a. For trees and plants planted in sidewalks and parking Tots, or in limited areas of soil volume, structural soils (Cornell University "CU" product or similar) must be used to a preferred depth of 36 inches, to promote root growth and provide structural support to the paved area. Minimum soil volumes for tree roots shall be 750 square feet per tree (see specifications and sample plans for CU-Structural Soils). Trees and other landscape materials shall be planted per specifications in "CU Structural Soils — A Comprehensive Guide" or using current BMPs subject to administrative review and approval of the technical information report (TIR.) Suspended pavement systems (Silva Cells or similar) may also be used if approved. b. For soil preparation in bioretention areas, existing soils must be protected from compaction. Bioretention soil media must be prepared in accordance with standard specifications of the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30, to promote a proper functioning bioretention system. These specifications shall be adhered to regardless of whether a stormwater permit is required from the City. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 6 of 18 c. For all other plantings, soils must be prepared for planting in accordance with specifications to restore soil moisture -holding capacity in accordance with TMC Chapter 16.54, Grading, regardless of whether a stormwater permit is required by the City. d. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting to ensure soils are properly prepared. e. Installation of landscape plants must comply with best management practices including: (1) Planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball. (2) Root balls of potted and balled and burlapped (B&B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B&B plants prior to planting. (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3-inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns of perennial plants. Section 10. TMC Section 18.50.085 Amended. Ordinance Nos. 2199 §17, 1830 §28, and 1758 §1 (part), as codified at TMC Section 18.50.085, "Maximum Percent Development Area Coverage," are hereby amended to read as follows: 18.50.085 Maximum Percent Development Area Coverage A. in the LDR zones the maximum percent development area coverage for a single- family development shall be as follows: 1. 75% on lots less than 13,000 square feet up to a maximum of 5,850 sq. ft.; and 2. 45% on lots greater than or equal to 13,000 square feet. B. In the MDR and HDR zones the maximum percent development area coverage shall be 50%, less the following surfaces: 1. the footprint of an exclusive recreational facility; 2. a proportion of a recreational facility footprint when contained within a general use building as follows: the portion of the footprint area occupied by a recreational facility divided by the number of floors in that portion of the building; 3. vehicle circulation aisles between separate parking areas; 4. sidewalks; W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 7 of 18 5. paths; and 6. other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment. C. Senior citizen housing development in HDR is exempt from development area coverage maximum; however, if the senior citizen housing is converted to regular apartments, the 50% limit must be met. D. The 50% maximum development area coverage for townhouse development may be increased up to a maximum of 75% development area coverage, if the applicant uses low -impact development techniques that are technically feasible and in accordance with the Surface Water Design Manual (TMC Chapter 14.30). Section 11. TMC Section 18.52.030 Amended. Ordinance Nos. 2251 §62 and 1872 §14 (part), as codified at TMC Section 18.52.030, "Perimeter Landscape Types," are hereby amended to read as follows: 18.52.030 Perimeter Landscape Types A. Type I landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a light visual separation between uses and zoning districts, screen parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 30 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 7 lineal feet of required perimeter excluding curb cuts or a planted berm at least 24 inches high; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type I landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. B. Type 11 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a moderate visual separation between uses and zoning districts, screen blank building walls and parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 20 lineal feet of required perimeter excluding curb cuts; and W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 8 of 18 b. One shrub for each 5 lineal feet of required perimeter excluding curb cuts; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type II landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. C. Type In landscape perimeter. 1. Purpose is to provide extensive visual separation between industrial areas and nearby residential areas. 2. Plant materials shall consist of the following: a. One tree per 20 lineal feet of required perimeter excludiing curb cuts; and b. Shrubs to provide a solid planting screen with a height of five to eight feet or a solid wooden fence or masonry wall to be approved by the Community Development Director; and c. Living groundcover to cover 90% of the landscape area within three years. D. Plant material requirements. 1. Plants shall meet the current American Standard for Nursery Stock (American Nursery and Landscape Association — ANLA), and shall be healthy, viigorous and well - formed, with well -developed, fibrous root systems, free from dead branches or roots. Plants shall be free from damage caused by temperature extremes, lack of or excess moisture, insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good color. Plants shall be habituated to outdoor environmental conditions (hardened -off). 2. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 3. Deciduous trees shall be used to allow visual access to entryways, signage and pedestrian use areas. 4. Evergreen shrubs shall be used to screen parking Tots along street frontages. 5. In perimeters located adjacent to residential zones 75% of trees and shrubs shall be evergreen. 6. Evergreen trees shall be a minimum of 6 feet in height at time of planting. 7. Deciduous trees shall have at least a 2-inch caliper at time of planting, determined according to the American Standard for Nursery Stock. 8. Shrubs shall be at least 18 inches in height at time of planting. 9. No plants listed on the current King County Noxious Weed list may be used. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 9 of 18 10. Existing vegetation may be used to meet the requirements of this chapter. All significant trees located within any required perimeter landscaping area which are not dead, dying, or diseased and which do not pose a safety hazard as determined by the Community Development Director shall be retained. 11. The classification of plant material as trees, shrubs and evergreens shall be as listed in the Hortus Third, A Concise Dictionary of Plants Cultivated in the U.S. and Canada. 12. Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant list or as administratively approved by the Director. Section 12. TMC Section 18.52.035 Amended. Ordinance Nos. 2442 §2, 2251 §63, 2235 §14 and 1872 §14 (part), as codified at TMC Section 18.52.035, "Interior Parking Lot Landscaping Requirements," are hereby amended to read as follows: 18.52.035 Interior Parking Lot Landscaping Requirements Landscaping within parking areas shall be provided as shown below. 1. Requirements for each distinctly separate parking area within the LDR zone for uses other than dwelling units, and in the MDR and HDR zones: a. For areas with up to 20 parking stalls per parking area, no interior landscaping is required. b. For areas with 21 - 40 parking stalls per parking area, 7 square feet of interior landscape area is required for each parking stall. c. For areas with more than 40 parking stalls per parking area, 12 square feet of interior landscape area is required for each parking stall (see Multi -Family Design Guidelines, Site Planning Section, No. 31, for the normal 15 square feet to be provided). d. All parking areas shall have a perimeter landscape strip a minimum of 2 feet wide with an average width of 5 feet. 2. Requirements for parking lots within the 0, MUO, RCC, and NCC zones: a. For lots with up to 20 parking stalls, no interior landscaping is required. b. For Tots with 21 - 40 parking stalls, a minimum of 10 square feet of interior landscape area is required for each parking stall over 20. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 10 of 18 c. For Tots with more than 40 parking stalls, a minimum of 200 square feet of interior landscape area plus 15 square feet for each parking stall over 40 is required. For areas placed behind buildings or otherwise screened from streets, parks and City trails the interior landscape requirement is reduced to a minimum of 200 square feet plus 10 square feet for each parking stall over 40. 3. Requirements for parking lots within the RC, RCM, C/LI, TSO and TVS zones: a. For areas adjacent to public or private streets, a minimum of 15 square feet of landscaping is required for each parking stall. b. For areas placed behind buildings or otherwise screened from streets, parks and City trails a minimum of 10 square feet of interior landscape area is required for each parking stall. 4. Planting Standards: a. Interior landscape islands shall be distributed to break up expanses of paving. Landscaped areas shall be placed at the ends of each interior row in the parking area, with no stall more than 10 stalls or 100 feet from a landscape area. Landscaped areas and planting islands may contain bioretention systems. b. The minimum size for interior parking lot planting islands is 100 square feet. c. Planting islands shall be a minimum of 6 feet in any direction and generally the length of the adjacent parking space. d. Raised curbs or curb stops shall be used around the landscape islands to prevent plant material from being struck by automobiles. Where bioretention is used, curb cuts shall be placed to allow stormwater runoff from adjacent pavements to enter the bioretention system. e. A minimum of 1 evergreen or deciduous tree is required per landscape island, with the remaining area to contain a combination of shrubs, living groundcover and mulch. Section 13. TMC Section 18.56.040 Amended. Ordinance Nos. 2500 §24, 2368 §54, 2251 §66, 1795 §3 (part), and 1758 §1 (part), as codified at TMC Section 18.56.040, "General Requirements," are hereby amended to read as follows: 18.56.040 General Requirements Any required off-street parking and loading facilities shall be developed in accordance with the following standards: 1. LOCATION. Any on -premises parking area that contains parking stalls located more than 1,000 feet from the principal use shall require Hearing Examiner approval for the entire parking lot. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 11 of 18 2. PARKING DIMENSIONS. Minimum parking area dimensions for surface and structured parking facilities shall be as provided in Figure 18-6. Standard and compact parking stalls shall be allowed a two -foot landscaping overhang to count towards the stall length. 3. TANDEM PARKING SPACES. In the MDR and HDR zones, tandem spaces (where one car is parked directly behind another) will be allowed for each three bedroom and 1/3 of all two bedroom units. No more than 1/3 of all project parking spaces may be tandem and all tandem parking spaces will be designed for full size rather than compact size vehicles based on the dimensions in Figure 18-6. 4. PARKING AREA AND PARKING AREA ENTRANCE AND EXIT SLOPES. The slope of off-street parking spaces shall not exceed 5%. The slope of entrance and exit driveways providing access for off-street parking areas and internal driveway aisles without parking stalls shall not exceed 15%. 5. DRIVEWAYS AND MANEUVERABILITY. a. Adequate ingress to and egress from each parking space shall be provided without moving another vehicle and without backing more than 50 feet. b. Turning and maneuvering space shall be located entirely on private property unless specifically approved by the Public Works Director. c. All parking spaces shall be internally accessible to one another without reentering adjoining public streets. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. d. When off-street parking is provided in the rear of a building and a driveway or lane alongside the building provides access to rear parking area, such driveway shall require a minimum width of twelve feet and a sidewalk of at least a three-foot section, adjoining the budding, curbed or raised six inches above the driveway surface. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. e. Ingress and egress to any off-street parking lot shall not be located closer than 20 feet from point of tangent to an intersection. f. The Public Works Director or the Community Development Director may require ingress separate from an egress for smoother and safer flow of traffic. 6. The Director may require areas not designed or approved for parking to be appropriately marked and/or signed to prevent parking. 7. SURFACE. a. The surface of any required off-street parking or loading facility shall be paved with permeable pavement, which is the preferred material, or asphalt, concrete or other similar approved material(s) that maintains a durable uniform surface and shall be graded and drained as to dispose of all surface water, but not across sidewalks. b. Any parking stalls provided in excess of the required minimum shall use permeable pavement where technically feasible in accordance with the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 12 of 18 c. All traffic -control devices, such as parking stripes designating car stalls, directional arrows or signs, bull rails, curbs and other developments shall be installed and completed as shown on the approved plans. d. Paved parking areas shall use paint or similar devices to delineate car stalls and direction of traffic. e. Where pedestrian walks are used in parking Tots for the use of foot traffic only, they shall be curbed or raised six inches above the lot surface. f. Wheel stops shall be required on the periphery of parking lots so cars will not protrude into the public right-of-way, walkways, off the parking lot or strike buildings. Wheel stops shall be two feet from the end of the stall of head -in parking. 8. PARALLEL PARKING STALLS. Parallel parking stalls shall be designed so that doors of vehicles do not open onto the public right-of-way. 9. OBSTRUCTIONS. No obstruction that would restrict car door opening shall be permitted within five feet of the centerline of a parking space. 10. LIGHTING. Any lighting on a parking lot shall illuminate only the parking lot, designed to avoid undue glare or reflection on adjoining premises. 11. CURB -CUTS. All parking areas shall have specific entrance and/or exit areas to the street. The width of access roads and curb -cuts shall be determined by the Public Works Director. The edge of the curb -cut or access road shall be as required by the Public Works Director for safe movement of vehicles or pedestrians. Curb -cuts in single-family districts shall be limited to a maximum of 20 feet in width and the location shall be approved by the Public Works Director. 12. PARKING STALL. Parking stalls shall not be used for permanent or semi- permanent parking or storage of trucks or materials. Section 14. TMC Section 18.56.065 Amended. Ordinance Nos. 2368 §57, 2199 §19, and 1976 §62, as codified at TMC Section 18.56.065, "Residential Parking Requirements," are hereby amended to read as follows: 18.56.065 Residential Parking and Storage Requirements A. Parking and vehicle storage limitations on properties devoted to single-family residential use shall be as follows: 1. Motor vehicles on property devoted to single-family residential use shall be parked on an approved durable uniform surface that is designed to retain surface water on -site and without causing impacts. If necessary, surface water may drain to street if no other design is feasible. Motor vehicles, other than those specified in TMC Section 18.56.065.A.2, shall not be parked in setbacks except in front or secondary front -yard setbacks from streets, when in a driveway that provides access to an approved parking location, and is in conformance with TMC Title 18, as that title currently exists or as it may be subsequently amended. Parking in the rear setback for a single-family home is permitted where the parking is connected to a rear alley. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 13 of 18 2. Recreational vehicles, boats or trailers shall be parked, kept or stored on an approved durable uniform surface and shall not be parked, kept or stored in required front yard setbacks, except for a driveway. Recreational vehicle parking in the side or rear yard setbacks is allowed, provided no recreational vehicle is parked so as to prevent access by emergency responders to all sides of a structure. 3. No more than 50% of the front yard or 800 square feet, whichever is smaller, may be approved durable uniform surface. An approved durable uniform surface exceeding this requirement prior to August 25, 2004 may be maintained, but shall not be expanded. The Director of Community Development may approve exceptions to this requirement for an access driveway, particularly on pie -shaped or other odd shaped Tots where it is infeasible to meet this requirement. 4. Single-family properties on pre-existing, legal lots of record containing Tess than 6,500 square feet are exempt from the percentages noted in TMC Section 18.56.065.A.3. 5. No more than six motor vehicles shall be parked on a single-family residential property of 13,000 square feet or less outside of a carport or enclosed garage for a period of more than 48 hours. For purposes of this section, "single-family residential property" means any parcel containing a single-family residence or multiple parcels combined containing one single-family residence, typically identified by a single address located in the LDR zone. The parking limitations in this subsection shall apply to all motor vehicles as defined by state law with the exception of motorcycles and mopeds. B. Each unit in a townhouse development shall have an attached garage with parking for at least one vehicle or a parking space in an underground garage. C. Waiver from the requirement for number of required stalls. The Director shall have the discretion to waive the requirement to construct a portion of the off-street parking requirement if, based on a parking demand study, the property owner establishes that the dwelling will be used primarily to house residents who do not and will not drive due to a factor other than age. Such a study shall ensure that ample parking is provided for residents who can drive, guests, caregivers and other persons who work at the residence. If such a waiver is granted, the property owner shall provide a site plan, which demonstrates that in the event of a change of use that eliminates the reason for the waiver, there is ample room on the site to provide the number of off-street parking spaces required by this Code. In the event that a change of use or type of occupant is proposed that would alter the potential number of drivers living or working at the dwelling, the application for change of use shall be conditioned on construction of any additional off- street parking spaces required to meet the standards of this Code. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 14 of 18 Section 15. TMC Section 18.70.050 Amended. Ordinance Nos. 2175 §1, 2077 §1, and 1819 §1 (part), as codified at TMC Section 18.70.050, "Nonconforming Structures," are hereby amended to read as follows: 18.70.050 Nonconforming Structures Where a lawful structure exists at the effective date of adoption of this title that could not be built under the terms of this title by reason of restrictions on area, development area, height, yards or other characteristics of the structure, it may be continued so long as the structure remains otherwise lawful subject to the following provisions: 1. No such structure may be enlarged or altered in such a way that increases its degree of nonconformity. Ordinary maintenance of a nonconforming structure is permitted, pursuant to TMC Section 18.70.060, including but not limited to painting, roof repair and replacement, plumbing, wiring, mechanical equipment repairfreplacement and weatherization. These and other alterations, additions or enlargements may be allowed as long as the work done does not extend further into any required yard or violate any other portion of this title. Complete plans shall be required of all work contemplated under this section. 2. Should such structure be destroyed by any means to an extent of more than 50% of its replacement cost at time of destruction, in the judgment of the City's Building Official, it shall not be reconstructed except in conformity with provisions of this title, except that in the LDR zone, structures that are nonconforming in regard to yard setbacks or sensitive area buffers, but were in conformance at the time of construction may be reconstructed to their original dimensions and location on the lot. 3. Should such structure be moved for any reason or any distance whatsoever, it shall thereafter conform to the regulations for the zone in which it is located after it is moved. 4. When a nonconforming structure, or structure and premises in combination, is vacated or abandoned for 24 consecutive months, the structure, or structure and premises in combination, shall thereafter be required to be in conformance with the regulations of the zone in which it is located. Upon request of the owner, the City Council may grant an extension of time beyond the 24 consecutive months. 5. Residential structures and uses located in any single-family or multiple - family residential zoning district and in existence at the time of adoption of this title shall not be deemed nonconforming in terms of bulk, use, or density provisions of this title. Such buildings may be rebuilt after a fire or other natural disaster to their original dimensions and bulk, but may not be changed except as provided in the non -conforming uses section of this chapter. 6. Single-family structures in single- or rnultiple-family residential zone districts that have legally nonconforming building setbacks, shall be allowed to expand the ground floor only along the existing building line(s), so long as the existing distance from the nearest point of the structure to the property line is not reduced, and the square footage of new intrusion into the setback does not exceed 50% of the square footage of the current intrusion. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 15 of 18 7. In wetlands, watercourses and their buffers, existing structures that do not meet the requirements of the Sensitive Areas Overlay District chapter of this title may be remodeled, reconstructed or replaced, provided that: a. The new construction does not further intrude into or adversely impact an undeveloped sensitive area or the required buffer; b. The new construction does not threaten the public health, safety or welfare; and c. The structure otherwise meets the requirements of this chapter. 8. In areas of potential geologic instability, coal mine hazard areas, and buffers, as defined in the Sensitive Areas Overlay District chapter of this title, existing structures may be remodeled, reconstructed or replaced, provided that: a. The new construction is subject to the geotechnical report requirements and standards of TMC Sections 18.45.120B and 18.45.120C; b. The new construction does not threaten the public health, safety or welfare; c. The new construction does not increase the potential for soil erosion or result in unacceptable risk or damage to existing or potential development or to neighboring properties; and d. The structure otherwise meets the requirements of this chapter. 9. A nonconforming use, within a nonconforming structure, shall not be allowed to expand into any other portion of the nonconforming structure. Section 16. TMC Figure 18-6, "Off -Street Parking Area Dimensions," Amended. Ordinance No. 1758 §1 (part), codified as Figure 18-6 in Title 18, is hereby amended to be shown as follows: W: Word Processing\ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 16 of 18 Off -Street Parking Area Dimensions TMC 18.56.040 A B C D E F Panting Stall Stall Aisle Width Curb Unit Width Angle Width Depth 1-way traffic 2-way traffic Length 1-way traffic 2-way traffic 0° 8* 8* 12 20 20* 28* 36* 8.5 8.5 12 20 23 29 37 30° 8* 15* 11 20 16* 41* 54* 8,5 17 11 20 17 45 54 9 17.5 11 20 18 46 55 9.5 18 11 2D 19 _ 47 56 45° 8* 17* 12.5 20 11.5* 46.5* 54* 8.5 19.5 12.5 20 12 51.5 59 9 20 12 20 12.7 52 60 9.5 20 12 20. 13.4 52 60 60° 8* 18* 17.5* 20 9.2* 53.5 56* 8.5 21 17.5 20 9,8 59.5 62 9 21 17 20 10.4 59 62 16.5 11 9.5 21 20 58.5 62 90° 8* 16* 24 25 8* 56* 57* 8.5 19 24 25 8.5 62 63 9 19 23 24 9 61 62 9.5 19 22 24 9.5 60 62 *These figures are for use with compact cars on y. Any bays that contain combined compact and normal spaces shall be designed for normal spaces. Curb Length (E) w� Paddy 0/:hta� tAl Aisle (D) stall width or depth (B or C) Aisle or Street r o •� Perpencriadar e \to \1 IIIC__ Length(E) Unit Width (F) Angled Parking W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Parallel Parking Figure 18-6 Off -Street Parking Area Dimensions Page 17 of 18 Section 17. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 18. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 19. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this -17-} day of to Q ,.ha-, , 2016. ATTEST/AUTHENTICATED: ,e6-P Christy O'Flaherty, MMC, City Clerk A an kberg, M or APPROVED AS TO FORM BY: Filed with the City Clerk: -Iia Passed by the City Council: _ S ,6 Published: _ -' --- Effective Date: P¢„ SO ell ar) 1 G Rachel B. Turpin, City Attorney Ordinance Number: .D-5/ f W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 11-29-16 MB:bjs Page 18 of 18 City of Tukwila Public Notice of Ordinance Adoption for Ordinances 2515-2521. On December 5, 2016 the City Council of the City of Tukwila, Washington, adopted the following ordinances, the main points of which are summarized by title as follows: Ordinance 2515: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ADOPTING THE BIENNIAL BUDGET OF THE CITY OF TUKWILA FOR THE 2017-2018 BIENNIUM; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2516: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2274 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 14.30.030, 14.30.060 AND 14.30.100, TO UPDATE REGULATIONS REGARDING SURFACE WATER MANAGEMENT; ESTABLISHING A NEW SECTION ENTITLED "TRASH AND WASTE RECEPTACLES," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTION 14.30.110; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2517: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2062 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 16.54.010, 16.54.030, 16.54.050, 16.54.060 AND 16.54.080, RELATED TO LOW IMPACT DEVELOPMENT REQUIREMENTS; ESTABLISHING TWO NEW SECTIONS ENTITLED "PERMIT APPLICATION REQUIREMENTS" AND "SEASONAL LIMITATION PERIOD," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTIONS 16.54.055 AND 16.54.065 RESPECTIVELY; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2518: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2519: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2459 §1, §2, AND §8, AND ORDINANCE NO. 2281 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 5.06.020, 5.06.040, 5.06.050 AND 5.06.140, TO UPDATE TUKWILA'S RESIDENTIAL RENTAL BUSINESS LICENSE AND INSPECTION PROGRAM REQUIREMENTS; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2520: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING NEW REGULATIONS TO REDUCE DEVELOPMENT AND LAND USE FEES FOR CERTAIN AFFORDABLE HOUSING PROJECTS, TO BE CODIFIED IN TUKWILA MUNICIPAL CODE CHAPTERS 16.04, 16.54, AND 18.88; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2521: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING REGULATIONS FOR A RESIDENTIAL IMPACT FEE DEFERRAL, TO BE CODIFIED IN TUKWILA MUNICIPAL CODE CHAPTERS 9.48, 16.26 AND 16.28; AMENDING AND/OR ADDING SECTIONS IN EACH OF THE AFOREMENTIONED CHAPTERS RELATING TO EXEMPTIONS AND DEFINITIONS (AMENDING ORDINANCE NOS. 2366 §1 (PART), 2365 §1 (PART), 2305 §1 AND 2111 §1 (PART) AS DELINEATED; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. The full text of these ordinances will be provided upon request. Christy O'Flaherty, MMC, City Clerk Published Seattle Times: December 8, 2016 City of Tukwila Washington Ordinance No. .51 �7 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2062 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 16.54.010, 16.54.030, 16.54.050, 16.54.060 AND 16.54.080, RELATED TO LOW IMPACT DEVELOPMENT REQUIREMENTS; ESTABLISHING TWO NEW SECTIONS ENTITLED "PERMIT APPLICATION REQUIREMENTS" AND "SEASONAL LIMITATION PERIOD," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTIONS 16.54.055 AND 16.54.065 RESPECTIVELY; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and WHEREAS, Permit section S5.C.4 requires the City to implement and enforce a program to reduce pollutants in stormwater runoff by regulating new development, redevelopment and construction sites; and W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 1 of 9 WHEREAS, on November 28, 2016, the Tukwila City Council, folllowing adequate public notice, held a public hearing on the draft ordinance; and WHEREAS, the City Council deems it necessary to update Tukwila Municipal Code Chapter 16.54, "Grading," to remain in compliance with the Permit; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. TMC Section 16.54.010 Amended. Ordinance No 2062 §1 (part), as codified at Tukwila Municipal Code (TMC) Section 16.54.010, "Purpose," is hereby amended to read as follows: The provisions of TMC Chapter 16.54 shall be liberally construed to accomplish the following purposes: 1. Prevent damage to life, public and private property, surface waters, sensitive areas and associated buffers. 2. Regulate grading activities, including excavation, fill, grading, earthwork construction, and structural preloads. 3. Prevent erosion and control sedimentation. 4. Establish the standards to govern grading activities. 5. Provide for approval and inspection of grading activities. 6. Prevent and minimize disturbance of native soils and landscapes, and restore the moisture -holding capacity of disturbed soils. Section 2. TMC Section 16.54.030 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.030, "Definitions," is hereby amended to read as follows: As used in TMC Chapter 16.54, the terms shall be defined as follows: 1. "Applicant" means any person who has applied for a grading permit. 2. "Buffer" means the area contiguous to a sensitive area that is required for the continued maintenance, function and structural stability of the sensitive area as defined in the Environmentally Sensitive Areas chapter of the Zoning Code (TMC Chapter 18.45). 3. "Compaction" means the densification of a fill or of existing soils by mechanical or other means, whether intentional or incidental. 4. "Director" means the Public Works Director or his/her designee, including the City Engineer and Public Works inspectors. 5. "Erosion" means the wearing away of land surface by the action of wind, water, gravity, or any combination thereof. 6. "Excavation" means the digging or removal of earth material, also referred to as a "cut." 7. "Fill" means a deposit of material placed by artificial means. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 2 of 9 8. "Grade" means the vertical location of the ground surface. 9. "Grading" means any activity that results in change of the cover or topography, or any activity that may cause erosion, including clearing, excavating, filling, and stockpiling associated with excavating and filling. 10. "Sensitive area" means wetlands, watercourses, areas of potential geologic instability, abandoned coal mines, and fish and wildlife habitat areas, per the City's Environmentally Sensitive Areas chapter of the Zoning Code (TMC Chapter 18.45.) 11. "Site" means any legally defined section of real property, whose boundaries are recorded with the King County Assessor's Office for the purposes of assessing taxes, or a group of adjoining sections of such real property that are proposed as the location for grading activities. 12. "Slope" means an inclined surface, the inclination of which us expressed as a ratio of horizontal distance to vertical distance. Section 3. TMC Section 16.54.050 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.050, "Permit," is hereby amended to read as follows: A. A permit is required for all grading activities occurring within the City limits, except the following: 1. Excavation for construction of a structure permitted under the Buildings and Construction chapter of Title 16 (TMC Chapter 16.04). 2. Cemetery graves. 3. Refuse disposal sites controlled by other regulations. 4. Excavations for wells, or trenches for utilities. 5. Mining, quarrying, excavating, processing or stockpiling rock, sand, gravel, aggregate or clay controlled by other regulations, provided such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties. 6. Exploratory excavations performed under the direction of a registered design professional, as long as this exploratory excavation does not constitute the beginning of construction of a building prior to obtaining a permit. 7. Gardening and routine landscape maintenance on a single-family residential lot. B. Applications for permits pursuant to TMC Chapter 16.54 shall be submitted to the City in the format and manner specified in TMC Section 16.54.055. C. An approved grading permit applies to one site. A separate permit shall be obtained for each site. D. The City shall collect a nonrefundable permit fee, the amount set by resolution of the City Council. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 3 of 9 Section 4. Regulations Established. TMC Section 16.54.055, "Permit Application Requirements," is hereby established to read as follows: 16.54.055 Permit Application Requirements A. To obtain a permit, the applicant shall submit an application on a form provided by or approved by the Director that shall include, at a minimum: 1. Identification and description of the work to be covered by the permit. 2. An estimate of the quantities of excavation and fill involved by volume and by the total area graded in square feet and as a percentage of the total site area. 3. Identification and description of all sensitive areas on the site or visible from the boundaries of the site. 4. Plans, reports, and specifications that, at a minimum, include those items required in IBC Section J104 and: a. Property boundaries, all existing and proposed easements and required setbacks; b. A 1:2000 scale vicinity map with a north arrow; c. Horizontal and vertical scale; d. Size and location of existing improvements on and wuthin 50 feet of the project, indicating which will remain and which will be removed; e. Location of all proposed cleared areas; f. Existing and proposed contours at maximum 2-foot intervals, extending for 20 feet beyond the project edge, that provide sufficient detail to identify how grade changes will conform to the requirements of this code; g. At least two cross sections, one in each direction, showing existing and proposed contours and horizontal and vertical scales; and h. A proposed erosion and sediment control plan consistent with TMC Chapter 14.30 and the Surface Water Design Manual, as adopted and as may be amended from time to time. B. Materials in addition to those required in TMC Section 16.54.055.A may be necessary for the Director to complete the review. The following materials shall be submitted when required by the Director: 1. Higher accuracy contours and more details of existing terrain and area drainage, limiting dimensions, elevations or finished contours to be achieved by the grading, and proposed drainage channels and related construction. 2. If applicable, all drainage plans and documentation consistent with TMC Chapter 14.30 and the Surface Water Design Manual, as adopted and as may be amended from time to time. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 4 of 9 3. Studies prepared by qualified specialists, as necessary to substantiate any submitted materials and compliance with this chapter or other law, particularly if clearing or grading is proposed to take place in or adjacent to an environmentally sensitive area. C. Plans and specifications shall include permanent drainage facilities and be prepared by a civil engineer if the project is: 1. in conjunction with the placement of a structure; or 2. located in steep slope or landslide hazard areas as defined in the Environmentally Sensitive Areas chapter of the Zoning Code (TMC Chapter 18.45). The Director may modify this requirement depending on the circumstances of the site or the proposed project. D. The Director shall determine the number of copies of the required plans, specifications and supporting materials necessary to perform the review and may require submittal of materials in alternative formats. E. The Director may waive specific submittal requirements if they are determined to be unnecessary for the acceptance and subsequent review of an application. Section 5. TMC Section 16.54.060 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.060, "Standards," is hereby amended to read as follows: A. All grading activities require erosion prevention and sediment control that prevents, to the maximum extent practicable, the transport of sediment from the site to drainage facilities, rights -of -way, water resources, and adjacent properties. Erosion and sediment controls shall be applied commensurate with the degree of risk, and as specified by the temporary erosion and sediment control measures, performance criteria, and implementation requirements of TMC Chapter '14.30 and the Surface Water Design Manual. B. All grading activities shall be undertaken according to the following mandatory standards: 1. All design and construction shall be performed to minimize soil disturbance, to minimize compaction where not required for structural stability, and to maximize erosion prevention and sediment control. 2. All grading activities shall be consistent with: a. The standards provided by this chapter. b. The Buildings and Construction Chapter (TMC Chapter 16.04), the Zoning Code (TMC Title 18,) and the International Building Code ("IBC") Appendix J. Appendix J is hereby adopted by reference, except as amended in TMC Sections 16.54.050, 16.54.060 and 16.54.065, and as may be amended from time to time. c. The Infrastructure Design and Construction Standards chapter (TMC Chapter 16.36). W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 5 of 9 d. The Surface Water Design Manual, as adopted in accordance with TMC Chapter 14.30 and as may be amended from time to time. e. Policies and procedures set forth by the Director. C. Cuts and fills shall conform to the standards provided in IBC Section J106, "Excavations," and J107, "Fills," except as modified below or otherwise approved by the Director: 1. Proviisions shall be made to: a. Prevent any surface water or seepage from damaging the cut face of any excavation or the sloping face of a fill. b. Address any surface water that is or might be concentrating as a result of a fill or excavation to a natural watercourse in accordance with TMC Chapter 14.30 and the Surface Water Design Manual. 2. Fill shall be compacted according to the following standards: a. Fill greater than 18 inches in depth shall be engineered and compacted to accommodate the proposed use in accordance with the applicable standard listed below unless a notice on title documenting the location of the fill is recorded and the fill is sufficiently stable so as not to pose a hazard, as follows: (1) Fill material at the location of a proposed building or a location not listed in subparagraphs (2) or (3) below shall be compacted in accordance with IBC Section J107.B. (2) Fill material at the location of proposed public infrastructure, such as streets and roads, shall be compacted in accordance with the Infrastructure Design and Construction Standards (TMC Chapter 16.36). (3) Fill material including, but not limited to, imported soils and compost, at the location of a proposed stormwater facility or placed as part of earthwork construction of a stormwater facility, shall be compacted in accordance with the Surface Water Design Manual and TMC Chapter 14.30. D. Access roads to grading sites shall be: 1. Maintained and located to the satisfaction of the Director to minimize problems with dust, mud, and traffic circulation; 2. Located where the permanent access to the site is proposed in the permit application to minimize site disturbance; and 3. Controlled by a gate when required by the Director. E. Signs warning of hazardous conditions, if determined by the Director to exist on a particular site, shall be affixed at locations as required by the Director. F. Where required by the Director to protect life, limb and property, fencing shall be installed with lockable gates that must be closed and locked when no work is being W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page6of9 conducted on the site. The fence shall be no less than six feet in height and the fence material shall have no opening larger than two inches. G. Rocks, dirt, mud, vegetation, topsoil, duff layer and any other materials stripped from, imported onto, used or produced on -site in the course of grading activities shall not be spilled onto, stockpiled, or otherwise left on public roadways or on any off -site property not specifically authorized as a receiving site under a valid permit. H. The duff layer and native topsoil shall be retained in an undisturbed state to the maximum extent practicable. Any duff layer or topsoil removed during grading shall be stockpiled to the maximum extent practicable on -site in a designated, controlled area not adjacent to public resources or to environmentally sensitive areas. The material shall be reapplied to other portions of the site where feasible. I. The soil moisture holding capacity of the soil shall be restored as follows: 1. Except as otherwise provided in TMC Section 16.54.060.1.2, areas that have been cleared and graded shall have the soil moisture -holding capacity restored to that of the original undisturbed soil native to the site to the maximum extent practicable. The soil in any area that has been compacted or that has had some or all of the duff layer or underlying topsoil removed shall be amended to mitigate for lost moisture -holding capacity. The amendment shall take place between May 1 and September 30. The topsoil layer shall be a minimum of eight inches thick, unless the applicant demonstrates that a different thickness will provide conditions equivalent to the soil moisture -holding capacity native to the site. The topsoil layer shall have an organic matter content of between 5% to 10% dry weight and a pH suitable for the proposed landscape plants. Subsoils below the topsoil layer should be scarified at least four inches with some incorporation of the upper material to avoid stratified layers. Compost used to achieve the required soil organic matter content must meet the definition of "composted materials" in WAC 173-350-220. 2. This subsection does not apply to areas that will be covered by an impervious surface at project completion, incorporated into a drainage facility or engineered as structural fill or slope. Section 6. Regulations Established. TMC Section 16.54.065, "Seasonal Limitation Period," is hereby established to read as follows: 16.54.065 Seasonal Limitation Period A. An annual period of limitation on site disturbance is established from October 1 through April 30. B. During the seasonal limitation period, grading shall only be permitted if demonstrated to the satisfaction of the Director that runoff leaving the construction site will comply with the erosion and sediment control measures, performance criteria and implementation requirements in the Surface Water Design Manual and after a review of the following: W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 7 of 9 1. Site conditions, including, but not limited to, vegetative coverage, slope, soil type, and proximity to receiving waters; 2. Proposed limitations on activities and the extent of disturbed areas; and 3. Proposed erosion and sedimentation control measures. C. Based on the information provided under TMC Section 16.54.065.B, the Director may expand or restrict the seasonal limitation on site disturbance. The Director shall set forth in writing the basis for approval or denial of clearing or grading during the seasonal limitation period. D. During the seasonal limitation period, grading will be allowed only if there is installation and maintenance of an erosion and sedimentation control plan approved by the Director that defines any limits on clearing and grading and specific erosion and sediment control measures required during the seasonal limitation period. The department may require or approve alternate best management practices. E. If, during the course of construction activity or soil disturbance during the seasonal limitation period, silt -laden runoff violating standards in the Surface Water Design Manual leaves the construction site or if clearing and grading limits or erosion and sediment control measures shown in the approved plan are not maintained, a Violation Notice and Order shall be issued in accordance with TMC Section 8.45.050. F. If the erosion and sediment control problem defined in the Violation Notice and Order is not adequately repaired within 24 hours of issuance, then a Stop Work Order may be issued in accordance with TMC Section 8.45.070 until such time as adequate erosion and sediment control measures to stop silt -laden runoff from leaving the site are installed. The Stop Work Order may also require the property owner or authorized agent to discontinue any further clearing or grading, except for erosion and sediment control maintenance and repair, until the following May 1. G. The following activities are exempt from the seasonal limitations of this section: 1. Routine maintenance and necessary repair of erosion and sediment control facilities. 2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in removal of the vegetative cover to the soil. 3. Activities where there is 100% infiltration of surface water runoff within the site in approved and installed erosion and sedimentation control facilities. 4. Typical landscaping activities of existing single-family residences that do not require a permit 5. Class I, II III and IV special forest practices in accordance with Chapter 76.09 RCW. 6. Response to emergencies that threaten the public health, safety or welfare. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs Page 8 of 9 Section 7. TMC Section 16.54.080 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.080, "Financial Guarantees," is hereby amended to read as follows: A. The Director may require a maintenance bond for erosion prevention and sediment control in the amount of 10% of the total project cost on projects which clear more than 6,000 square feet or contain or abut sensitive areas such as, but not limited to, Class 2 or steeper slopes, wetlands, or critical drainage. B. If the Director determines the nature of any work creates a hazard to human life or endangers public or private property or sensitive areas, the Director may require the applicant to file a Certificate of Insurance. The Director, based on the nature of the risks involved, shall determine the amount of insurance. Section 8. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 9. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 10. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of Q(`, a ,.,r. b_2., , 2016. ATTES /AUTHENTICATED: O'Fla e r Christy rty, MMC, City Clerk APPROVED AS TO FORM BY: rdaeiLa-- Rac ieI B. Turpin, City Attorney Alla?'f Ekberg, Mayor Filed with the City Clerk: Passed by the City Cou Published: Effective Date: Ql)--k < cTi040 t 0 Ordinance Number: I0-/6 W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 11-29-16 GV:bjs I: Page 9 of 9 City of Tukwila Public Notice of Ordinance Adoption for Ordinances 2515-2521. On December 5, 2016 the City Council of the City of Tukwila, Washington, adopted the following ordinances, the main points of which are summarized by title as follows: Ordinance 2515: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ADOPTING THE BIENNIAL BUDGET OF THE CITY OF TUKWILA FOR THE 2017-2018 BIENNIUM; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2516: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2274 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 14.30.030, 14.30.060 AND 14.30.100, TO UPDATE REGULATIONS REGARDING SURFACE WATER MANAGEMENT; ESTABLISHING A NEW SECTION ENTITLED "TRASH AND WASTE RECEPTACLES," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTION 14.30.110; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2517: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2062 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 16.54.010, 16.54.030, 16.54.050, 16.54.060 AND 16.54.080, RELATED TO LOW IMPACT DEVELOPMENT REQUIREMENTS; ESTABLISHING TWO NEW SECTIONS ENTITLED "PERMIT APPLICATION REQUIREMENTS" AND "SEASONAL LIMITATION PERIOD," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTIONS 16.54.055 AND 16.54.065 RESPECTIVELY; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2518: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2519: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2459 §1, §2, AND §8, AND ORDINANCE NO. 2281 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 5.06.020, 5.06.040, 5.06.050 AND 5.06.140, TO UPDATE TUKWILA'S RESIDENTIAL RENTAL BUSINESS LICENSE AND INSPECTION PROGRAM REQUIREMENTS; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2520: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING NEW REGULATIONS TO REDUCE DEVELOPMENT AND LAND USE FEES FOR CERTAIN AFFORDABLE HOUSING PROJECTS, TO BE CODIFIED IN TUKWILA MUNICIPAL CODE CHAPTERS 16.04, 16.54, AND 18.88; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2521: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING REGULATIONS FOR A RESIDENTIAL IMPACT FEE DEFERRAL, TO BE CODIFIED IN' TUKWILA MUNICIPAL CODE CHAPTERS 9.48, 16.26 AND 16.28; AMENDING AND/OR ADDING SECTIONS IN EACH OF THE AFOREMENTIONED CHAPTERS RELATING TO EXEMPTIONS AND DEFINITIONS (AMENDING ORDINANCE NOS. 2366 §1 (PART), 2365 §1 (PART), 2305 §1 AND 2111 §1 (PART) AS DELINEATED; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. The full text of these ordinances will be provided upon request. Christy O'Flaherty, MMC, City Clerk Published Seattle Times: December 8, 2016 City of Tukwila Washington Ordinance No. 5 Ih AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2274 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 14.30.030, 14.30.060 AND 14.30.100, TO UPDATE REGULATIONS REGARDING SURFACE WATER MANAGEMENT; ESTABLISHING A NEW SECTION ENTITLED "TRASH AND WASTE RECEPTACLES," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTION 14.30.110; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends the coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and WHEREAS, stormwater management procedures established in 2010 by City of Tukwila Ordinance No. 2274, and amended by Ordinance No. 2423, no longer effectively address the surface water management requirements outlined above; and WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing on the draft ordinance; and W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 1 of 7 WHEREAS, the City Council deems it to be in the best interest of public safety, health and welfare for its citizens to enact the new surface water regulations; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. TMC Section 14.30.030 Amended. Ordinance No. 2274 §1 (part), as codified at Tukwila Municipal Code (TMC) Section 14.30.030, "Definitions," subparagraph 13, is hereby amended to read as follows: 14.30.030 Definitions 13. "Low impact development ("LID") means a stormwater and land use management strategy that strives to mimic pre -disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. Section 2. TMC Section 14.30.060 Amended. Ordinance No. 2274 §1 (part), as codified at TMC Section 14.30.060, "Standards," is hereby amended to read as follows: 14.30.060 Standards All development activities within the City shall be undertaken in accordance with the following minimum standards, except that depending on a project's possible impact to public and environmental health and safety, the Director may require stricter standards: 1. The City's National Pollutant Discharge Elimination System (NPDES) permit. 2. The 2016 King County Surface Water Design Manual (hereafter known and referred to as "KCSWDM"), attached hereto as "Exhibit A" (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Surface Water Design Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Surface Water Design Manual or the SWDM. The Director will review subsequent amendments to the KCSWDM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 3. The Department of Ecology 2012 Stormwater Management Manual for Western Washington, hereafter known and referred to as the "DOE SWDM," may be used for project design for multi -jurisdictional development projects wherein a substantial and material portion of the development project will take place outside of the jurisdictional boundaries of the City and will be required by a permitting authority to comply with the standards set forth in the DOE SWDM; provided that the Public Works Director approves of the DOE SWDM based upon a finding that application of differing standards set forth in the SWDM and the DOE SWDM will create a hardship for the applicant, and that approval of use of the DOE SWDM will not result in requirements W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 2 of 7 that are less restrictive than the SWDM or otherwise inconsistent with the purpose of this chapter. 4. The 2016 King County Stormwater Pollution Prevention Manual, hereafter known and referred to as "KCSPPM," attached hereto as Exhibit B (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Stormwater Pollution Prevention Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Stormwater Pollution Prevention Manual or the "SPPM." The Director will review subsequent amendments to the KCSPPM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 5. The Public Works Surface Water Regulations and Procedures. 6. Development design and construction shall meet all of the applicable standards and codes, recommendations in specific reports, such as the geo-technical report and the Technical Information Report, and design criteria contained in the Comprehensive Surface Water Management Plan or Drainage Basin Plans. 7. Unless the context indicates otherwise, the following terms and phrases, as used in the SWDM or the SPPM, shall have the meaning or reference given. See Figure 14-4 relating to Tukwila Terminology Equivalents to King County Terminology. Figure 14.4 — Tukwila Terminology Equivalents to King County Terminology King County Term City of Tukwila Term Agricultural Project Term does not apply. Critical Drainage Area Critical Drainage Area means an area as determined by the City needing additional controls to address flooding, drainage and/or erosion condition that poses an imminent likelihood of harm to the welfare and safety of the surrounding community. DDES1 City of Tukwila Department of Community Development. DNRP1 City of Tukwila Department of Community Development. Director City of Tukwila Public Works Director. King County City of Tukwila. King County Road Standards City of Tukwila Infrastructure Design and Construction Standards and the requirements of the City of Tukwila Public Works Department. Water and Land Resource Division City of Tukwila Public Works. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 3 of 7 Zoning Classifications: Agriculture (A); Forest (F); Rural (Z) These zoning classifications are intended for areas outside the Urban Growth Boundary; therefore the City of Tukwila contains no equivalent zoning. Refer to City of Tukwila zoning maps and designations. 'Other terms used in the KCSWDM to reference other King County staff or departments shall also refer to the City of Tukwila Department of Community Development. 8. All references in the SWDM or the SPPM to the following King County codes, or any section thereof, shall be replaced by reference as indicated in Figure 14-5 to the applicable code and comparable section thereof. 9. All references in the SWDM and SPPM to the following maps shall be replaced by reference as indicated in Figure 14-6. Figure 14.6 — Tukwila Maps Equivalent to King County Maps or Designation King County Map or Designation City of Tukwila Map or Designation Coal Mine Hazard Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Landslide Hazard Area and Landslide Drainage Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Water Quality Applications Map Not applicable.. Aquatic areas (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Wetlands (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Seismic Hazard Areas Defined and regulated through the Washington State Building Code. Flood Hazard Area (as defined in KCC 21A.06) Flood Plain Management will be regulated through TMC Section 16.52. Steep Slope Hazard Area (no map referenced in the KCSWDM) Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Critical Aquifer Recharge Area (as defined in KCC 21A.06) Not applicable. Wildlife Habitat Conservation Area (as defined in KCC 21A.06) Fish and wildlife habitat conservation areas will be regulated through TMC Chapter 18.44, Shoreline Overlay District, and the regulations in TMC Chapter 18.45 related to wetlands and watercourses. Wildlife Habitat Networks (as defined in KCC 21A.06) No equivalent. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 4 of 7 All references in the SWDM to the Stormwater Pollution Prevention Manual shall mean and refer to the SPPM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. All references in the SPPM to the Stormwater Design Manual shall mean and refer to the SWDM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. The definition of Critical Drainage Area in Chapter 1 of the SWDM is amended by striking "by administrative rule under the procedures specified in KCC 2.98." The reference in Section 1.1.2.4 of the SWDM to Urban Planned Development shall mean and refer to the equivalent such designation under the City of Tukwila Comprehensive Plan as determined by the City of Tukwila Community Development Director. The note following the third sentence of Section 1.1.3 of the SWDM is stricken. The last paragraph of Section 1.1.4 beginning with "Additional mitigation" is stricken. The reference in Section 1.2.2 at paragraph 2 of the SWDM to KCC 21A.24.110 shall mean and refer to the applicable provision of Title 18 of the Tukwila Municipal Code. All references to Critical Area Review in the SWDM and the SPPM shall mean and refer to Environmentally Sensitive Area Review pursuant to Title 18 of the Tukwila Municipal Code. References in the SWDM and SPPM to Chapter 16.82 of the King County Code shall mean and refer to the clearing and grading provisions of Title 16 of the Tukwila Municipal Code. Subsection F of Section 1.2.4.3 of the SWDM is omitted. The reference in Section 1.2.7 to King County Ordinance 12020 shall mean and refer to the financial guarantee requirements of the applicable provisions of the Tukwila Municipal Code or the Public Works Surface Water Regulations and Procedures. Section 1.4.4 of the SWDM is stricken and replaced with the following: All variances ("Adjustments") from Chapter 14.30 of the TMC, the SWDM and the SPPM shall be governed by the procedures, standards and requirements set forth in Chapter 18.72 of the Tukwila Municipal Code, as it now exists or may hereafter be amended. The reference in Section 1.4.5 of the SWDM to KCC 20.20 shall mean and refer to the applicable provisions of Title 18 of the Tukwila Municipal Code. References to offices of King County shall mean and refer to the equivalent offices of the City of Tukwila. Except when the context indicates otherwise, references in the SWDM and the SPPM to specific codes or sections of codes of King County, such as the King County critical areas code, shoreline management code, clearing and grading code, and road standards, shall mean and refer to the equivalent codes or sections of codes of the City of Tukwila. Section 3. TMC Section 14.30.100 Amended. Ordinance No. 2274 §1 (part), as codified at TMC Section 14.30.100, "Inlet Marking," is hereby amended to read as follows: 14.30.100 Inlet Marking A. All new inlets and catch basin grates, public or private, shall be marked "No Dumping! Drains to Stream." In addition, a four -inch raised pavement marking that states "No dumping —Drains to Streams" or equivalent as approved by the Public Works Director shall be installed. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 5of7 B. Existing inlets and catch basin grates in areas being resurfaced or when being modified or replaced, shall be marked "No Dumping! Drains to Stream." In addition, a four -inch raised pavement marking that states "No dumping —Drains to Streams" or equivalent as approved by the Public Works Director shall be installed. C. The marking shall meet the standard in the City's Development Guidelines and Design and Construction Standards. Section 4. Regulations Established. TMC Section 14.30.110, "Trash and Waste Receptacles," is hereby established to read as follows: 14.30.110 Trash and Waste Receptacles A. Restaurants, including food preparation facilities; facilities with an outdoor trash compactor; or facilities that have been determined to generate pollution or waste activities, shall have a dedicated, roof -covered trash enclosure that drains to a catch basin connected to a grease interceptor that drains to the sanitary sewer. The trash enclosure area shall be kept clean and contained and shall not drain to a storm drainage system. B. Dumpsters and garbage and waste containers shall be Teak -proof and kept closed or lidded at all times except when disposing of waste materials. C. Grease storage containers shall be kept covered at all times and shall have spill containment. The area shall be kept clean and clear of any fats, oil or grease and shall not drain to a storm drainage system or sanitary sewer system Section 5. TMC Sections Recodified. The following TMC sections are hereby renumbered to be codified as follows: 14.30.120 Financial Guarantees 14.30.130 Insurance 14.30.140 Exceptions 14.30.150 Liability 14.30.160 Penalties 14.30.170 Abatement 14.30.180 Injunctive Relief 14.30.190 Appeals Section 6. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 11-29-16 GV:bjs Page 6 of 7 other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 7. Severability. If any section subsection, paragraph, sentence, clause or phase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 8. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this STN day of _b , 2016. ATTEST/AUTHENTICATED: yQ r, F Christy O'FIerty, MMC, City Cler APPROVED AS TO FORM BY: Rachel B. Turpin, City Attorney Filed with the City Clerk: ) )—,D--/, Passed by the City Council: I -_-_t.b Published: ) -- ),b Effective Date: p 0.4. Spry Ordinance Number:Sf Attachments: Exhibit A — 2016 King County Surface Water Design Manual (KCSWDM) Exhibit B — 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 '11-29-16 GV:bjs Page 7 of 7 City of Tukwila Public Notice of Ordinance Adoption for Ordinances 2515-2521. On December 5, 2016 the City Council of the City of Tukwila, Washington, adopted the following ordinances, the main points of which are summarized by title as follows: Ordinance 2515: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ADOPTING THE BIENNIAL BUDGET OF THE CITY OF TUKWILA FOR THE 2017-2018 BIENNIUM; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2516: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2274 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 14.30.030, 14.30.060 AND 14.30.100, TO UPDATE REGULATIONS REGARDING SURFACE WATER MANAGEMENT; ESTABLISHING A NEW SECTION ENTITLED "TRASH AND WASTE RECEPTACLES," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTION 14.30.110; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2517: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2062 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 16.54.010, 16.54.030, 16.54.050, 16.54.060 AND 16.54.080, RELATED TO LOW IMPACT DEVELOPMENT REQUIREMENTS; ESTABLISHING TWO NEW SECTIONS ENTITLED "PERMIT APPLICATION REQUIREMENTS" AND "SEASONAL LIMITATION PERIOD," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTIONS 16.54.055 AND 16.54.065 RESPECTIVELY; PROVIDING FOR SEVERAIBILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2518: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2519: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2459 §1, §2, AND §8, AND ORDINANCE NO. 2281 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 5.06.020, 5.06.040, 5.06.050 AND 5.06.140, TO UPDATE TUKWILA'S RESIDENTIAL RENTAL BUSINESS LICENSE AND INSPECTION PROGRAM REQUIREMENTS; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2520: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING NEW REGULATIONS TO REDUCE DEVELOPMENT AND LAND USE FEES FOR CERTAIN AFFORDABLE HOUSING PROJECTS, TO BE CODIFIED IN TUKWILA MUNICIPAL CODE CHAPTERS 16.04, 16.54, AND 18.88; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. Ordinance 2521: AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, ESTABLISHING REGULATIONS FOR A RESIDENTIAL IMPACT FEE DEFERRAL, TO BE CODIFIED IN TUKWILA MUNICIPAL CODE CHAPTERS 9.48, 16.26 AND 16.28; AMENDING AND/OR ADDING SECTIONS IN EACH OF THE AFOREMENTIONED CHAPTERS RELATING TO EXEMPTIONS AND DEFINITIONS (AMENDING ORDINANCE NOS. 2366 §1 (PART), 2365 §1 (PART), 2305 §1 AND 2111 §1 (PART) AS DELINEATED; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. The full text of these ordinances will be provided upon request. Christy O'Flaherty, MMC, City Clerk Published Seattle Times: December 8, 2016 Tukwila City Council Agenda `. ��'� ' `' ��0 �i9 �oa ❖ COMMITTEE OF THE WHOLE ❖ Allan Ekberg, Mayor Counci/members; + Dennis Robertson ❖ Verna Seal David Cline, City Administrator ❖ Kathy Hougardy ❖ De'Sean Quinn Joe Duffle, Council President + Kate Kruller + Thomas McLeod Monday, November 28, 2016; 7:00 PM Tukwila City Hall Council Chambers 1. CALL TO ORDER / PLEDGE OF ALLEGIANCE 2. CITIZEN COMMENT At this time, you are invited to comment on items not included on this agenda (p/ease limit your comments to five minutes per citizen). To comment on an item listed on this agenda, please save your comments until the issue is presented for discussion. (Refer to back of agenda page for additional information.) 3. PUBLIC HEARINGS a. Code changes: (1) An ordinance updating regulations regarding surface water management, establishing a new section entitled "Trash and Waste Receptacles." (TMC Title 14) (2) An ordinance related to low impact development requirements, establishing two new sections entitled "Permit Application Requirements" and "Seasonal Limitation Period." (TMC Title 16) (3) An ordinance implementing low impact development requirements in the design and review of surface water drainage on development projects. (TMC Titles 8 and 18) Pg.1 Pg.7 Pg.15 Pg.25 4. SPECIAL ISSUES a. Code changes: (1) An ordinance updating regulations regarding surface water management, establishing a new section entitled "Trash and Waste Receptacles." (TMC Title 14) (2) An ordinance related to Vow impact development requirements, establishing two new sections entitled "Permit Application Requirements" and "Seasonal Limitation Period." (TMC Title 16) (3) An ordinance implementing low impact development requirements in the design and review of surface water drainage on development projects. (TMC Titles 8 and 18) b. A non -binding statement of intent to enter into an Interlocal Agreement with Regional Animal Services of King County (RASKC). c. A resolution accepting a land donation. d. A resolution authorizing study of the Landscape Conservation and Local Infrastructure Program (LCLIP). e. An ordinance updating the rental license requirements to match the fee resolution and require proactive pest control. Pg.1 Pg7 Pg15 Pg.25 Pg.51 Pg.111 Pg.129 Pg.189 (continued...) COUNCIL AGENDA SYNOPSIS Initials Meeting Date Prepared by Mayor's review C until review 11J28/16 BG Z.... 12/05/16 BG ITEM INFORMATION ITEMNo. 3.A. & 4.A. STAFF SPONSOR: BOB GIBERSON ORIGINAL AGENDA DATE: 11/28/16 AGENDA ITEM TITLE NPDES Surface Water Permit Requirements for LID Development Ordinance Amendments to TMC Titles 14, 16, 8.25 & 18 CATEGORY / 1 Discussion Mtg Date 11/28/16 ❑ Motion Mtg Date ❑ Resolution Mtg Date / / Ordinance Mtg Date 12/05/16 ❑ Bid Award Mtg Date ❑ Other Mtg Date / 1 Public Hearing Mtg Date 11/28/16 SPONSOR ❑ Council ❑ Mayor ❑ HR ❑ DCD ❑ Finance ❑ Fire ❑ TS ❑ P&R ❑ Police I P117 SPONSOR'S Per our National Pollutant Discharge Elimination System Permit, the City is required to SUMMARY adopt Low Impact Development (LID) Principles and LID Best Management Practices. In addition, the City is required to adopt the State Department of Ecology's Stormwater Manual or equivalent. TMC Titles 14, 16, 8.25 & 18 will need to be amended by Ordinance to meet these requirements. Title 14 will adopt the 2016 King County Surface Water Design Manual and the 2016 King County Stormwater Pollution Prevention Manual. REVIEWED BY ❑ COW Mtg. ❑ CA&P Cmte ❑ F&S Cmte Cmte ❑ Arts Comm. ❑ Parks Comm. & 9/27, & 10/27/16 COMMITTEE CHAIR: KATHY Transportation Cmte I Utilities ►1 Planning Comm. HOUGARDY DATE: 9/13 RECOMMENDATIONS: SPONSOR/ADMIN. COMMITTEE Public Works Department Unanimous Approval; Forward to Committee of the Whole COST IMPACT / FUND SOURCE EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED $0.00 $0.00 $0.00 Fund Source: Comments: MTG. DATE RECORD OF COUNCIL ACTION 11/28/16 12/05/16 MTG. DATE ATTACHMENTS 11/28/16 Informational Memorandum dated 11/23/16 Draft Title 14 Ordinance, Draft Title 16 Ordiance, Draft Title 8.25 & 18 Ordinances Minutes from the Utilties Committee meeting of 9/13/16 and 9/27/16 Minutes from the Planning Commission meeting of 10/27/16 12/5/16 1 f 1 r 1 ti �J City of Tukwila Allan Ekberg, Mayor Public Works Department - Bob Giberson, Director INFORMATIONAL MEMORANDUM TO: .City Council FROM: Bob Giberson, Public Works Director BY: Greg Villanueva, NPDES Coordinator CC: Mayor Ekberg DATE: November 23, 2016 SUBJECT: NPDES Phase II Permit for Surface Water Project No. 99341210 Stormwater Updates to TMC Title 14, Title 16, and Title 8.25 & 18 ISSUE Adopt three ordinances that update Tukwila Municipal Code (TMC) Title 14, 16, 8.25 & 18. BACKGROUND The City of Tukwila operates its municipal drainage system under a National Pollutant Discharge Elimination System (NPDES) Phase II storm water permit administered by the Department of Ecology (DOE). This NPDES permit allows the City to discharge surface water to Waters of the State (Green/Duwamish River) if we meet various permit requirements. One permit requirement mandates that the City review, revise, and make Low Impact Development (LID) principles and LID Best Management Practices effective in City codes and other enforceable documents no later than December 31, 2016. This mandate also requires that the City adopt a new Surface Water Design Manual that meets Department of Ecology requirements. ANALYSIS TMC Section 14.30 Surface Water Management For the updated Surface Water Design Manual, staff began working on this NPDES permit requirement by comparing the DOE's 2012 Stormwater Management Manual and the 2016 King County Surface Water Design Manual (KCSWDM). Staff determined that adopting the 2016 KCSWDM along with the 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) is our best option to meet the DOE requirement to adopt a new Surface Water Design Manual. The City currently uses the 2009 KCSWDM and the 2016 KCSWDM is an update that incorporates the required LID principles and practices. Adopting the 2016 KCSWDM is consistent with the majority of our neighboring cities. Staff prepared an ordinance to amend the Surface Water Management Chapter, TMC Section 14.30, to adopt these manuals as well as several other code changes. The proposed substantive changes are: • Adding a definition for Low Impact Development (LID) • Adopting the 2016 King County Surface Water Design Manual (KCSWDM) • Adopting the 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) • Adding a requirement for additional no dumping labeling to catch basins • Adding requirements for trash and waste receptacles The 2016 King County Surface Water Design Manual and the 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) can be found on the City's NPDES web page. W:PW Eng1PROJECTSIA- DR Projects NPDES Program (99341210)12015 2017 Capacity Gran6Otak LID Gap Analysis1COW Nov 28 2016 Info Memo.itcx 3 NPDES Info Memo November 23, 2016 Page 2 TMC Titles 16, 8.25 & 18 In addition to adopting new storm water requirements, the NPDES Permit requires that the City review all development related codes, rules, and standards to incorporate LID principles and practices and identify any existing regulations that might conflict with those LID principles and practices. To accomplish this requirement, the City contracted with Otak, Inc. to provide an LID gap analysis of our codes. Otak developed a list of various City codes that may provide barriers to LID implementation. Otak then met and worked with staff from relevant departments to review the potential LID barriers and update the City codes where needed. The public was informed about this code updates through notices posted at public facilities and LID information on the City's NPDES web page, along with holding several public meetings. This process produced proposed changes to TMC Section 16.54, Section 8.25, and Title 18. The proposed changes to each are as follows: TMC Section 16.54 Grading The proposed grading changes in TMC 16.54 are significant and are consistent with changes King County was required to make to their grading ordinance in order for the DOE to consider the King County Surface Water Design Manual equivalent to the DOE Surface Water Design Manual. The proposed substantive changes that amend TMC Section 16.54 are: • Adding additional permit application requirements • Revising erosion and sediment control standards • Adopting the International Building Code by reference • Adding cut and fill standards • Adding requirements to maintain moisture holding capacity of soil TMC Section 8.25 Vehicle Parking and Storage on Single Family Property and Title 18 Zoning In addition to LID code updates to TMC Chapter 18, it was also determined that Parking regulations currently in TMC Section 8.25 Vehicle Parking and Storage on Single Family Property, which contained LID regulations, were better suited in TMC Chapter 18. The proposed substantive changes to both chapters are: • Updating the Durable Uniform Surface definition to include pervious surfaces and moving it from TMC Section 8.25 and into Section18.06 • Moving TMC Section 8.25.020 Parking Limitations to TMC Section 18.56.056 • TMC Title 18 - Adding definitions concerning permeable pavement and green roofs • TMC Title 18 - Modifying the development area for single family properties • TMC Title 18 - Allowing bioretention facilities as acceptable within landscaped areas • TMC Title 18 - Adding soil protection and amendment requirements • TMC Title 18 - Eliminating the largest Off -Street Parking stall size standard • TMC Title 18 - Referencing a bioretention plant list for bioretention facilities Committee Review and Public Input The following is a summary of the various committee meetings and public involvement: • 2/14/16 Surface Water Management Program Open House LID Discussion • 2/23/16 Utilities Committee LID presentation • 3/21/16 Transportation Committee LID presentation • 5/14/16 Backyard Wildlife Festival LID presentation W:1PW Eng♦PROJECTS\A• DR ProjectsWPDES Program (99341210)12015 2017 Capacity Grant Otak LID Gap Malysis\COW Nov 28 2016 Into Meno.docx 4 NPDES Info Memo November 23, 2016 Page 3 • 8/10/16 LID Open House • 9/13/16 Utilities Committee Title 14, Title 8, and Title 18 LID Code Update • 9/27/16 Utilities Committee Title 16 LID Code Update • 10/27/16 Planning Commission Meeting Title 8 and 18 Public Hearing • 11/28/16 Committee of Whole Title 14 and 16 Public Hearing • 11/28/16 Committee of Whole Titles 8, 14, 16 and 18 discussion • 12/05/16 Scheduled adoption Council Regular meeting FISCAL IMPACT The new drainage requirements will impact both private and public projects and may affect design, construction, and maintenance costs. The U.S. Environmental Protection Agency has competed studies on the cost of LID implementation and determined that an LID approach to storm water management is less expensive on average to construct and maintain then using conventional storm water facilities. RECOMMENDATION Council is being asked to approve three Ordinances that amend TMC Sections 14.30, 16.54, and 8.25 & Title 18 and consider these items on the Consent Agenda at the December 5, 2016 Regular Meeting. ATTACHMENTS Draft Ordinance Amending TMC Section 14.30 Draft Ordinance Amending TMC Section 16.54 Draft Ordinance Amending TMC Section 8.25 and TMC Title 18 W9PW Eng\PROJECTSIA• DR PrajectsWPDES Program (99341210)12015 2017 Capacity Gran9Otak LID Gap Anaysis\COW Nov 28 2016 Into Merno docx 5 l .....l Proposed TMC Title 14 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2274 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 14.30.030, 14.30.060 AND 14.30.100, TO UPDATE REGULATIONS REGARDING SURFACE WATER MANAGEMENT; ESTABLISHING A NEW SECTION ENTITLED "TRASH AND WASTE RECEPTACLES," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTION 14.30.110; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends the coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and WHEREAS, stormwater management procedures established in 2010 by City of Tukwila Ordinance No. 2274, and amended by Ordinance No. 2423, no longer effectively address the surface water management requirements outlined above; and WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing on the draft ordinance; and W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 1 of 7 7 WHEREAS, the City Council deems it to be in the best interest of public safety, health and welfare for its citizens to enact the new surface water regulations; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. TMC Section 14.30.030 Amended. Ordinance No. 2274 §1 (part), as codified at Tukwila Municipal Code (TMC) Section 14.30.030, "Definitions," subparagraph 13, is hereby amended to read as follows: 14.30.030 Definitions 13. "Low impact development ("LID") means use of innovative or creative a stormwater and land use management strategy that strives to mimic pre -disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. Section 2. TMC Section 14.30.060 Amended. Ordinance No. 2274 §1 (part), as codified at TMC Section 14.30.060, "Standards," is hereby amended to read as follows: 14.30.060 Standards All development activities within the City shall be undertaken in accordance with the following minimum standards, except that depending on a project's possible impact to public and environmental health and safety, the Director may require stricter standards: 1. The City's National Pollutant Discharge Elimination System (NPDES) permit. 2. The 2009 2016 King County Surface Water Design Manual (hereafter known and referred to as "KCSWDM"), attached hereto as "Exhibit A" (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Surface Water Design Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Surface Water Design Manual or the SWDM. The Director will review subsequent amendments to the KCSWDM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 3. The Department of Ecology 2005 2012 Stormwater Management Manual for Western Washington, hereafter known and referred to as the "DOE SWDM," may be used for project design for multi -jurisdictional development projects wherein a substantial and material portion of the development project will take place outside of the jurisdictional boundaries of the City and will be required by a permitting authority to comply with the standards set forth in the DOE SWDM; provided that the Public Works Director approves W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 2 of 7 8 of the DOE SWDM based upon a finding that application of differing standards set forth in the SWDM and the DOE SWDM will create a hardship for the applicant, and that approval of use of the DOE SWDM will not result in requirements that are less restrictive than the SWDM or otherwise inconsistent with the purpose of this chapter. 4. The 2009 2016 King County Stormwater Pollution Prevention Manual, hereafter known and referred to as "KCSPPM," attached hereto as Exhibit B (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Stormwater Pollution Prevention Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Stormwater Pollution Prevention Manual or the "SPPM." The Director will review subsequent amendments to the KCSPPM and will make recommendations to th.e City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 5. The Public Works Surface Water Regulations and Procedures. 6. Development design and construction shall meet all of the applicable standards and codes, recommendations in specific reports, such as the geo-technical report and the Technical Information Report, and design criteria contained in the Comprehensive Surface Water Management Plan or Drainage Basin Plans. 7. Unless the context indicates otherwise, the following terms and phrases, as used in the SWDM or the SPPM, shall have the meaning or reference given. See Figure 14-4 relating to Tukwila Terminology Equivalents to King County Terminology. Figure 14.4 — Tukwila Terminology Equivalents to King County Terminology King County Term City of Tukwila Term Agricultural Project Term does not apply. Critical Drainage Area Critical Drainage Area means an area as determined by the City needing additional controls to address flooding, drainage and/or erosion condition that poses an imminent likelihood of harm to the welfare and safety of the surrounding community. DDES' City of Tukwila Department of Community Development. DNRP1 City of Tukwila Department of Community Development. Director City of Tukwila Public Works Director. King County City of Tukwila. King County Road Standards City of Tukwila Infrastructure Design and Construction Standards and the requirements of the City of Tukwila T-ranapn-Public Works Department and Surface Wator Util-ity-as-applicable. Water and Land Resource Division City of Tukwila Public Works. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14,30 strike-thru 10-11-16 GV:bjs Page 3 of 7 9 Zoning Classifications: Agriculture (A); Forest (F); Rural (Z) These zoning classifications are intended for areas outside the Urban Growth Boundary; therefore the City of Tukwila contains no equivalent zoning. Refer to City of Tukwila zoning maps and designations. 'Other terms used in the KCSWDM to reference other King County staff or departments shall also refer to the City of Tukwila Department of Community Development. 8. All references in the SWDM or the SPPM to the following King County codes, or any section thereof, shall be replaced by reference as indicated in Figure 14-5 to the applicable code and comparable section thereof. 9. All references in the SWDM and SPPM to the following maps shall be replaced by reference as indicated in Figure 14-6. Figure 14.6 — Tukwila Maps Equivalent to King County Maps or Designation King County Map or Designation City of Tukwila Map or Designation Coal Mine Hazard Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Landslide Hazard Area and Landslide Drainage Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Water Quality Applications Map Not applicable. Aquatic areas (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Wetlands (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Seismic Hazard Areas Defined and regulated through the Washington State Building Code. Flood Hazard Area (as defined in KCC 21A.06) Flood Plain Management will be regulated through TMC Section 16.52. thocc maps A V. with an or Steep Slope Hazard Area (no map referenced in the KCSWDM) Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Critical Aquifer Recharge Area (as defined in KCC 21A.06) Not applicable. Wildlife Habitat Conservation Area (as defined in KCC 21A.06) Fish and wildlife habitat conservation areas will be regulated through TMC Chapter 18.44, Shoreline Overlay District, and the regulations in TMC Chapter 18.45 related to wetlands and watercourses. Wildlife Habitat Networks (as defined in KCC 21A.06) No equivalent. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 4 of 7 10 All references in the SWDM to the Stormwater Pollution Prevention Manual shall mean and refer to the SPPM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. All references in the SPPM to the Stormwater Design Manual shall mean and refer to the SWDM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. The definition of Critical Drainage Area in Chapter 1 of the SWDM is amended by striking "by administrative rule under the procedures specified in KCC 2.98." The reference in Section 1.1.2.4 of the SWDM to Urban Planned Development shall mean and refer to the equivalent such designation under the City of Tukwila Comprehensive Plan as determined by the City of Tukwila Community Development Director. The note following the third sentence of Section 1.1.3 of the SWDM is stricken. The last paragraph of Section 1.1.4 beginning with "Additional mitigation" is stricken. The reference in Section 1.2.2 at paragraph 2 of the SWDM to KCC 21A.24.110 shall mean and refer to the applicable provision of Title -1-9-18 of the Tukwila Municipal Code. All references to Critical Area Review in the SWDM and the SPPM shall mean and refer to Critical Environmentally Sensitive Area Review pursuant to Title 18 of the Tukwila Municipal Code. References in the SWDM and SPPM to Chapter 16.82 of the King County Code shall mean and refer to the clearing and grading provisions of Title 16 of the Tukwila Municipal Code. Subsection F of Section 1.2.4.3 of the SWDM is omitted. The reference in Section 1.2.7 to King County Ordinance 12020 shall mean and refer to the financial guarantee requirements of the applicable provisions of the Tukwila Municipal Code or the Public Works Surface Water Regulations and Procedures. Section 1.4.4 of the SWDM is stricken and replaced with the following: All variances ("Adjustments") from Chapter 14.30 of the TMC, the SWDM and the SPPM shall be governed by the procedures, standards and requirements set forth in Chapter 18.72 of the Tukwila Municipal Code, as it now exists or may hereafter be amended. The reference in Section 1.4.5 of the SWDM to KCC 20.20 shall mean and refer to the applicable provisions of Title 18 of the Tukwila Municipal Code. References to offices of King County shall mean and refer to the equivalent offices of the City of Tukwila. Except when the context indicates otherwise, references in the SWDM and the SPPM to specific codes or sections of codes of King County, such as the King County critical areas code, shoreline management code, clearing and grading code, and road standards, shall mean and refer to the equivalent codes or sections of codes of the City of Tukwila. Section 3. TMC Section 14.30.100 Amended. Ordinance No. 2274 §1 (part), as codified at TMC Section 14.30.100, "Inlet Marking," is hereby amended to read as follows: 14.30.100 Inlet Marking A. All new inlets and catch basin grates, public or private, shall be marked "No Dumping! Drains to Stream." In addition, a four -inch raised pavement marking that states "No dumping —Drains to Streams" or equivalent as approved by the Public Works Director shall be installed. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 5 of 7 11 B. Existing inlets and catch basin grates in areas being resurfaced or when being modified or replaced, shall be marked "No Dumping! Drains to Stream." In addition, a four -inch raised pavement marking that states "No dumping —Drains to Streams" or equivalent as approved by the Public Works Director shall be installed. C. The marking shall meet the standard in the City's Development Guidelines and Design and Construction Standards. Section 4. Regulations Established. TMC Section 14.30.110, "Trash and Waste Receptacles," is hereby established to read as follows: 14.30.110 Trash and Waste Receptacles A. Restaurants, including food preparation facilities; facilities with an outdoor trash compactor; or facilities that have been determined to generate pollution or waste activities, shall have a dedicated, roof -covered trash enclosure that drains to a catch basin connected to a grease interceptor that drains to the sanitary sewer. The trash enclosure area shall be kept clean and contained and shall not drain to a storm drainage system. B. Dumpsters and garbage and waste containers shall be leak -proof and kept closed or lidded at all times except when disposing of waste materials. C. Grease storage containers shall be kept covered at all times and shall have spill containment. The area shall be kept clean and clear of any fats, oil or grease and shall not drain to a storm drainage system or sanitary sewer system Section 5. TMC Sections Recodified. The following TMC sections are hereby renumbered to be codified as follows: 14.30.440120 14.30.120130 14.30.130140 14.30.4-40150 14.30.150160 14.30.4-60170 14.30.0180 14.30.4-80190 Financial Guarantees Insurance Exceptions Liability Penalties Abatement Injunctive Relief Appeals Section 6. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 6 of 7 12 Section 7. Severability. If any section subsection, paragraph, sentence, clause or phase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 8. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of , 2016. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of , 2016. ATTEST/AUTHENTICATED: Christy O'Flaherty, MMC, City Clerk APPROVED AS TO FORM BY: Rachel B. Turpin, City Attorney Allan Ekberg, Mayor Filed with the City Clerk: Passed by the City Council: Published: Effective Date: Ordinance Number: Attachments: Exhibit A — 2016 King County Surface Water Design Manual (KCSWDM) Exhibit B — 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) W: Word Processing\ordinances\Low Impact Development rqmts-TMC 14.30 strike-thru 10-11-16 GV:bjs Page 7of7 13 r1 Proposed TMC Title 16 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING ORDINANCE NO. 2062 §1 (PART), AS CODIFIED AT TUKWILA MUNICIPAL CODE SECTIONS 16.54.010, 16.54.030, 16.54.050, 16.54.060 AND 16.54.080, RELATED TO LOW IMPACT DEVELOPMENT REQUIREMENTS; ESTABLISHING TWO NEW SECTIONS ENTITLED "PERMIT APPLICATION REQUIREMENTS" AND "SEASONAL LIMITATION PERIOD," TO BE CODIFIED AS TUKWILA MUNICIPAL CODE SECTIONS 16.54.055 AND 16.54.065 RESPECTIVELY; PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Westem Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and WHEREAS, Permit section S5.C.4 requires the City to implement and enforce a program to reduce pollutants in stormwater runoff by regulating new development, redevelopment and construction sites; and W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 1 of 9 15 WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing on the draft ordinance; and WHEREAS, the City Council deems it necessary to update Tukwila Municipal Code Chapter 16.54, "Grading," to remain in compliance with the Permit; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. TMC Section 16.54.010 Amended. Ordinance No 2062 §1 (part), as codified at Tukwila Municipal Code (TMC) Section 16.54.010, "Purpose," is hereby amended to read as follows: The provisions of TMC Chapter 16.54 shall be liberally construed to accomplish the following purposes: 1. Prevent damage to life, public and private property, surface waters, sensitive areas and associated buffers. 2. Regulate grading activities, including excavation, fill, grading, earthwork construction, and structural preloads. 3. Prevent erosion and control sedimentation. 4. Establish the standards to pet ►it- ovem grading activities. 5. Provide for approval and inspection of grading activities. 6. Prevent and minimize disturbance of native soils and Landscapes, and restore the moisture -holding capacity of disturbed soils. Section 2. TMC Section 16.54.030 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.030, "Definitions," is hereby amended to read as follows: As used in TMC Chapter 16.54, the terms shall be defined as follows: 1. `Applicant"means any person who has applied for a grading permit. 2. "Buffer"means the area contiguous to a sensitive area that is required for the continued maintenance, function and structural stability of the sensitive area as defined in the Environmentally Sensitive Areas chapter of the Zoning Code (TMC Chapter 18.45). 3. "Compaction"means the densification of a fill or of existing soils by mechanical or other means, whether intentional or incidental. 34. "Director" means the Public Works Director or his/her designee, including the City Engineer and Public Works inspectors. 45. "Erosion"means the wearing away of land surface by the action of wind, water, gravity, or any combination thereof. 66. "Excavation" means the digging or removal of earth material, also referred to as a "cut." W: Word Processing\ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 2 of 9 16 67. "Fill" means a deposit of material placed by artificial means. 7. "Geotechnical engineering" means the application of coil mechanics in the 8. "Grade"means the vertical location of the ground surface. 89. "Grading"means any activity that results in change of the cover or topography, or any activity that may cause erosion, including clearing, exsavationexcavatinq, filling, grad+n-and stockpiling associated with excavating and filling. 910. "Sensitive area" means wetlands, watercourses, areas of potential geologic instability, abandoned coal mines, and fish and wildlife habitat areas, per the City's Environmentally Sensitive Areas Oretinaneechapter of the Zoning Code (TMC Chapter 18.45.) 4011. "Site" means any legally defined section of real property, whose boundaries are recorded with the King County Assessor's Office for the purposes of assessing taxes, or a group of adjoining sections of such real property that are proposed as the location for grading activities. 12. "Slope" means an inclined surface, the inclination of which is expressed as a ratio of horizontal distance to vertical distance. Section 3. TMC Section 16.54.050 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.050, "Permit," is hereby amended to read as follows: A. A permit is required for all grading activities occurring within the City limits, except the following: 1. Excavation for construction of a structure permitted under the Buildings and Construction chapter of Title 16 (TMC Chapter 16.04). 2. Cemetery graves. 3. Refuse disposal sites controlled by other regulations. 4. Excavations for wells, or trenches for utilities. 5. Mining, quarrying, excavating, processing or stockpiling rock, sand, gravel, aggregate or clay controlled by other regulations, provided such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties. 6. Exploratory excavations performed under the direction of a registered design professional, as long as this exploratory excavation does not constitute the beginning of construction of a building prior to obtaining a permit. 7. Gardening and routine landscape maintenance on a single-family residential lot. B. Applications for permits pursuant to TMC Chapter 16.54 shall be submitted to the City in the format and manner specified by the Dircctorin TMC Section 16.54.055. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 3 of 9 17 C. An approved grading permit applies to one site. A separate permit shall be obtained for each site. D. The City shall collect a nonrefundable permit fee, the amount set by resolution of the City Council. Section 4. Regulations Established. TMC Section 16.54.055, "Permit Application Requirements," is hereby established to read as follows: 16.54.055 Permit Application Requirements A. To obtain a permit, the applicant shall submit an application on a form provided by or approved ty the Director that shall include, at a minimum: 1. Identification and description of the work to be covered by he permit. 2. An estimate of the quantities of excavation and fill involved by volume and by the total area graded in square feet and as a percentage of the total site area. 3. Identification and description of all sensitive areas on the site or visible from the boundaries of the site. 4. Plans, reports, and specifications that, at a minimum, inolude those items required in IBC Section J104 and: a. Property boundaries, all existing and proposed easements and required setbacks: b. A 1:2000 scale vicinity map with a north arro v. c. Horizontal and vertical scale; d. Size and location of existing improvements on and within 50 feet ot the project. indicating which will remain and which will be removed; e. Location of all proposed cleared areas; f. Existing and proposed contours at maximum 2-foot intervals, extending for 20 feet beyond the protect edge, that provide sufficient detail to identify how grade changes will conform to the requirements of this code; q. At least two cross sections, one in each direction, showing existing and proposed contours and horizontal and vertical scales: and h. A proposed erosion and sediment control plan consistent with TMC Chapter 14.30 and the Surface Water Design Manual, as adopted and as may be amended from time to time. B. Materials in addition to those required in TMC Section 16.54.055.A may be necessary for the Director to complete the review. The following materials shall be submitted when required by the Director: 1. Higher accuracy contours and more details of existing terrain and area drainage, limiting dimensions, elevations or finished contours to be achieved by the grading, and proposed drainage channels and related construction. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 4 of 9 18 2. If applicable, all drainage plans and documentation consistent with TMC Chapter 14.30 and the Surface Water Design Manual, as adopted and as may be amended from time to time. 3. Studies re ared b ualified s ecialists as necessary to substantiate any submitted materials and compliance with this chapter or other law, particularly if clearing or grading is proposed to take place in or adjacent to an environmentally sensitive area. C. Plans and specifications shall include permanent drainage facilities and be prepared by a civil engineer if the project is: 1. in conjunction with the placement of a structure; or 2. located in steep slope or landslide hazard areas as defined in the Environmentally Sensitive Areas chapter of the Zoning Code (TMC Chapter 18.45). The Director may modify this requirement depending on the circumstances of the site or the proposed project. D. The Director shall determine the number of copies of the required plans, specifications and supporting materials necessary to perform the review and may require submittal of materials in alternative formats. E. The Director may waive specific submittal requirements if they are determined to be unnecessary for the acceptance and subsequent review of an application. Section 5. TMC Section 16.54.060 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.060, "Standards," is hereby amended to read as follows: A. All grading activities require erosion prevention and sediment control that prevents, to the maximum extent practicable, the transport of sediment from the site to drainage facilities, rights -of -way, water resources, and adjacent properties. Erosion and sediment controls shall be applied commensurate with the degree of risk, and as specified by the temporary erosion and sediment control measures, performance criteria, and implementation requirements of TMC Chapter 14.30 and the Surface Water Design Manual . B. All grading activities shall be undertaken according to the following mandatory standards: 1. All design and construction shall be performed to minimize soil disturbance, to minimize compaction where not required for structural stability, and to maximize erosion prevention and sediment control. 2. All grading activities shall be consistent with: a. The standards provided by this chapter. ab. The Buildings and Construction Chapter (TMC Chapter 16.04)The Chapter -the Zoning Code (TMC Title 18,) and the International Building Code ("IBC") Appendix J. Appendix J is hereby adopted by reference, except as W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 5 of 9 19 amended in TMC Sections 16.54.050, 16.54.060 and 16.54.065, and as may be amended from time to time. bc. The Infrastructure Design and Construction Standards chapter (TMC Chapter 16.36) ' ed. The I g--County Surface Water Design Manual, Appendix-DT as adopted in accordance with TMC Chapter 14.30 and as may be amended from time to time. Wi. T4.I ifa-Municipal-Cede Chapter`18.45-, "Sensitive-Arcas." e. Policies and procedures set forth by the Director. C. Cuts and fills shall conform to the standards provided in IBC Section J106, "Excavations," and J107, "Fills," except as modified below or otherwise approved by the Director: 1. Provisions shall be made to: a. Prevent any surface water or seepage from damaging the cut face of any excavation or the sloping face of a fill. b. Address anv surface water that is or might be concentrating as a result of a fill or excavation to a natural watercourse in accordance with TMC Chapter 14.30 and the Surface Water Design Manual. 2. Fill shall be compacted according to the following standards: a. Fill greater than 18 inches in depth shall be engineered and compacted to accommodate the proposed use in accordance with the applicable standard listed below unless a notice on title documenting the location of the fill is recorded and the fill is sufficiently stable so as not to pose a hazard, as follows: (1) Fill material at the location of a proposed building or a location not listed in subparagraphs (2) or (3) below shall be compacted in accordance with IBC Section J107.B. (2) Fill material at the location of proposed public infrastructure, such as streets and roads, shall be compacted in accordance with the Infrastructure Design and Construction Standards (TMC Chapter 16.36). (3) Fill material including, but not limited to, imported soils and compost, at the location of a proposed stormwater facility or placed as part of earthwork construction of a stormwater facility, shall be compacted in accordance with the Surface Water Design Manual and TMC Chapter 14.30. D. Access roads to grading sites shall be: 1. Maintained and located to the satisfaction of the Director to minimize problems with dust, mud, and traffic circulation~ 2. Located where the permanent access to the site is proposed in the permit application to minimize site disturbance; and W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 6 of 9 20 3. Controlled by a gate when required by the Director, E. Signs warning of hazardous conditions, if determined by the Drector to exist on a particular site, shall be affixed at locations as required by the Director. F. Where required by the Director to protect life, limb and property, fencing shall be installed with lockable gates that must be closed and locked when no work is being conducted on the site. The fence shall be no less than six feet in height and the fence material shall have no opening larger than two inches. G. Rocks, dirt, mud, vegetation, topsoil, duff layer and any other materials stripped from, imported onto, used or produced on -site in the course of grading activities shall not be spilled onto, stockpiled, or otherwise left on public roadways or on any off -site property not specifically authorized as a receiving site under a valid permit. H. The duff layer and native topsoil shall be retained in an undisturbed state to the maximum extent practicable. Any duff laver or topsoil removed during grading shall be stockpiled to the maximum extent practicable on -site in a designated, controlled area not adjacent to public resources or to environmentally sensitive areas. The material shall be reapplied to other portions of the site where feasible. I. The soil moisture holding capacity of the soil shall be restored as follows: 1. Except as otherwise provided in TMC Section 16.54.060.1.2, areas that have been cleared and graded shall have the soil moisture -holding capacity restored to that of the original undisturbed soil native to the site to the maximum extent practicable. The soil in any area that has been compacted or that has had some or all of the duff layer or underlying topsoil removed shall be amended to mitigate for lost moisture -holding capacity. The amendment shall take place between May 1 and September 30. The topsoil layer shall be a minimum of eight inches thick, unless the applicant demonstrates that a different thickness will provide conditions equivalent to the soil moisture -holding capacity native to the site. The topsoil layer shall have an organic matter content of between 5% to 10% dry weight and a pH suitable for the proposed landscape plants. Subsoils below the topsoil layer should be scarified at least four inches with some incorporation of the upper material to avoid stratified layers. Compost used to achieve the required soil organic matter content must meet the definition of "composted materials" in WAC 173-350-220. 2. This subsection does not apply to areas that will be covered by an impervious surface at project completion, incorporated into a drainage facility or engineered as structural fill or slope. Section 6. Regulations Established. TMC Section 16.54.065, "Seasonal Limitation Period," is hereby established to read as follows: 16.54.065 Seasonal Limitation Period A. An annual period of limitation on site disturbance is established from October 1 through April 30. W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 7 of 9 21 B. During the seasonal limitation period, grading shall only be permitted if demonstrated to the satisfaction of the Director that runoff leaving the construction site will comply with the erosion and sediment control measures, performance criteria and implementation requirements in the Surface Water Design Manual and after a review of the following: 1. Site conditions, including, but not limited to, vegetative coverage, slope, soil type, and proximity to receiving waters; 2._Proposed limitations on activities and the extent of disturbed areas; and 3. Proposed erosion and sedimentation control measures. C. Based on the information provided under TMC Section 16.54.065.B, the Director may expand or restrict the seasonal limitations on site disturbance. The Director shall set forth in writing the basis for approval or denial of clearing or grading during the seasonal (imitation period. D. During the seasonal limitation period, grading will be allowed only if there is installation and maintenance of an erosion and sedimentation control plan approved by the Director that defines any limits on clearing and grading and specific erosion and sediment control measures required during the seasonal limitation period. The department may require or approve alternate best management practices. E. If, during the course of construction activity or soil disturbance during the seasonal limitation period, silt -laden runoff violating standards in the Surface Water Design Manual leaves the construction site or if clearing arid grading limits or erosion and sediment control measures shown in the approved plan are not maintained, a Violation Notice and Order shall be issued in accordance with TMC Section 8.45.050. F. If the erosion and sediment control problem defined in the Violation Notice and Order is not adequately repaired within 24 hours of issuance, then a Stop Work Order may be issued in accordance with TMC Section 8.45.070 until such time as adequate erosion and sediment control measures to stop silt -laden runoff from leaving the site are installed. The Stop Work Order may also require the property owner or authorized agent to discontinue any further clearing or grading, except for erosion and sediment control maintenance and repair, until the following May 1. G. The following activities are exempt from the seasonal limitations of this section: 1. Routine maintenance and necessary repair of erosion and sediment control facilities. 2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in removal of the vegetative cover to the soil. 3. Activities where there is 100% infiltration of surface water runoff within the site in approved and installed erosion and sedimentation control facilities. 4. Typical landscaping activities of existing single-family residences that do not require a permit. W: Word Processing\OrdinanceslLow Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 8 of 9 22 RCW. 5. Class I, II III and IV special forest practices irl accordance with Chapter 76.09 6. Response to emergencies that threaten the public health, safety or welfare. Section 7. TMC Section 16.54.080 Amended. Ordinance No 2062 §1 (part), as codified at TMC Section 16.54.080, "Financial Guarantees," is hereby amended to read as follows: A. The Director may require a maintenance bond for erosion prevention and sediment control in the amount of 10% of the total project cost on projects which clear more than 6,000 square feet or contain or abut sensitive areas such as, but not limited to, Class 2 or steeper slopes, wetlands, or critical drainage. B. If the Director determines the nature of any work creates a hazard to human life; or endangers public or private property or sensitive areas, the Director may require the applicant to file a Certificate of Insurance. The Director, based on the nature of the risks involved, shall determine the amount of insurance. Section 8. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 9. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 10. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of , 2016. ATTEST/AUTHENTICATED: Christy O'Flaherty, MMC, City Clerk Allan Ekberg, Mayor APPROVED AS TO FORM BY: Filed with the City Clerk: Passed by the City Council: Published: Effective Date: Rachel B. Turpin, City Attorney Ordinance Number: W: Word Processing\Ordinances\Low Impact Development rqmts-TMC 16.54 strike-thru 11-5-16 GV:bjs Page 9 of 9 23 f Proposed TMC Title 8-25 & 18 GM ir AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Washington State Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 1 of 19 25 WHEREAS, Section S5.C.4 of the Permit requires the City to implement and enforce a program to reduce pollutants in stormwater runoff by regulating new development, redevelopment and construction sites; and WHEREAS, a requirement of Section S5.C.4 of the Permit mandates the City reduce pollutants in stormwater by implementing Low Impact Development (LID) requirements through new and revised development codes by December 31, 2016; and WHEREAS, the City Council deems it necessary to update the code provisions in Title 8, "Public Peace, Morals and Safety," and Title 18, "Zoning," to remain in compliance with the Permit; and WHEREAS, on October 27, 2016, the Tukwila Planning Commission, following adequate public notice, held a public hearing to receive testimony concerning amending the Tukwila Municipal Code and at that meeting adopted a motion recommending the proposed changes; and WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing to receive testimony concerning the recommendations of the Planning Commission; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. Repealer. Ordinance Nos. 2495, 2371, 2251 §1 (part), and 2056, as codified at Tukwila Municipal Code (TMC) Chapter 8.25, are hereby repealed, thereby eliminating TMC Chapter 8.25, "Vehicle Storage and Parking on Single -Family Residential Property," in its entirety. 8.25.010 Definition Section 8.25.010; or Section 8.26.010; or W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 2 of 19 26 8.-2 020 A. Tho requirements of TMC Chapter 8.25 apply to the storage and parking of vehicles . connected to a roar alley. C. Recreational vehicles, boats or trailers shall, O. Approved durable uniform surfaces outside of structures on site may cover a 0 0 an accex. driveway, particularly on pie shaped or other odd shaped Tots where it is infeasible to meet this requirement. s noted in TMC Section 8.25.020, G. No more than six motor vehicles shall be parked on a single-family residential Section 2. Repealer. Ordinance Nos. 2075 §1 (part) and 1758 §1 (part), as codified at TMC Section 18.06.515, "Lot Coverage" (definition), are hereby repealed, thereby eliminating TMC Section 18.06.515. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 3 of 19 27 4. Blacktop (2" minimum asphalt concrete pavement) over gravel section as described above and sloped to drain to prevent drainage impacts; or 5. Any other configuration of materials approved by the City that maintains a durable uniform surface and prevents drainage impacts. Section 6. New Definition Adopted. A new section is hereby added to TMC Chapter 18.06, "Definitions," to read as follows: Pervious Hard Surface "Pervious hard surface" means permeable pavement or a green roof. Section 7. TMC Section 18.10.060 Amended. Ordinance Nos. 1971 §4 and 1758 §1 (part), as codified at TMC Section 18.10.060, "Basic Development Standards," are hereby amended to read as follows: 18.10.060 Basic Development Standards Development within the Low -Density Residential District shall conform to the following listed and referenced standards: LDR BASIC DEVELOPMENT STANDARDS Lot area, minimum 6,500 sq. ft. Average lot width (min. 20 ft. street frontage width), minimum 50 feet Development Area, maximum 75% on lots Tess than 13,000 sq. ft. (only for single family up to a maximum of 5,850 sq. ft. development) 45% on lots greater than or equal to 13,000 sq. ft. Setbacks to yards (minimum): • Front 20 feet • Front, decks or porches 15 feet • Second front 10 feet • Sides 5 feet • Rear 10 feet Height, maximum 30 feet Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See 18.10.030 • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 5 of 19 28 Section 8. TMC Section 18.20.080 Amended. Ordinance Nos. 1976 §39, 1872 §3, and 1758 §1 (part), as codified at TMC Section 18.20.080, "Basic Development Standards," are hereby amended to read as follows: 18.20.080 Basic Development Standards Development within the Residential Commercial Center District shall conform to the following listed and referenced standards: RCC BASIC DEVELOPMENT STANDARDS Lot area, minimum 5,000 sq. ft. Lot area per unit (multi -family), minimum 3,000 sq. ft. Setbacks to yards (min.): • Front 20 feet • Second front 10 feet • Sides 5 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear 10 feet Height, maximum 3 stories or 35 feet Landscape requirements (minimum): All setback areas shall be landscaped. Required landscaping may include a mix of plant materials, bioretention facilities, pedestrian amenities and features, outdoor cafe -type seating and similar features, subject to approval. See Landscape, Recreation, Recycling/Solid Waste Space chapter for further requirements • Front 20 feet • Second front 10 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet Recreation space 200 sq. ft. per dwelling unit (1,000 sq. ft. min.) W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 6 of 19 29 Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See Accessory Use section of this chapter • Office, minimum 3 per 1,000 sq. ft usable floor area • Retail, minimum 2.5 per 1,000 sq. It usable floor area • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations Performance Standards: Use, activity and operations within a structure or a site shall comply with (1) standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, (2) TMC Chapter 8.22, "Noise", and (3) adopted State and Federal standards for water quality and hazardous materials. In addition, all development subject to the requirements of the State Environmental Policy Act, RCW 43.21C, shall be evaluated to determine whether adverse environmental impacts have been adequately mitigated. Section 9. TMC Section 18.28.240 Amended. Ordinance No. 2443 §25, as codified at TMC Section 18.28.240, "General Landscaping," subparagraph B.3., "Soil Preparation and Planting," is hereby amended to read as follows: 18.28.240 General Landscaping 3. Soil Preparation and Planting. a. For trees and plants planted in sidewalks and parking Tots, or in limited areas of soil volume, Cornell University CU-structural soils (Cornell University "CU" product or similar) must be used to a preferred depth of 36 inches, to promote tree root growth and provide structural support to the paved area. Minimum soil volumes for tree roots shall be 750 square feet per tree (see specifications and sample plans for CU- Structural Soils). Trees and other landscape materials shall be directly —planted der specifications in "CU Structural Soils — A Comprehensive Guide" or using current BMPs subject to administrative review and approval of the technical information report (TIR.) Suspended pavement systems (Silva Cells or similar) may also be used if approved. into b. For soil preparation in bioretention areas, existing soils must be protected from compaction. Bioretention soil media must be prepared in accordance with standard specifications of the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30, to promote a proper functioning bioretention system. These W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 7 of 19 30 specifications shall be adhered to regardless of whether a stormwater permit is required from the City. bc. For all other plantings, soils must be prepared for planting in accordance with specifications to restore soil moisture -holding capacity in accordance with TMC Chapter 16.54, Grading, BMP T5.13, "Post Construction Soil Quality and Depth," from the Washington (or as amended) regardless of whether a stormwater permit is required by the City. ed. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting to ensure soils are properly prepared. de. Installation of landscape plants must comply with best management practices including: (1) Planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball. (2) Root balls of potted and balled and burlapped (B&B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B&B plants prior to planting. (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3-inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns of perennial plants. Section 10. TMC Section 18.50.085 Amended. Ordinance Nos. 2199 §17, 1830 §28, and 1758 §1 (part), as codified at TMC Section 18.50.085, "Maximum Percent Development Area Coverage," are hereby amended to read as follows: 18.50.085 Maximum Percent Development Area Coverage A. In the LDR zones the maximum percent development area coverage for a single- family development shall be as follows: 1. 75% on lots less than 13,000 square feet up to a maximum of 5,850 sq. ft.; and 2. 45% on lots greater than or equal to 13,000 square feet. B. In the MDR and HDR zones the maximum percent development area coverage shall be 50%, less the following surfaces: 1. the footprint of an exclusive recreational facility; W: Word Processing\Ordinances\Low Impact Development rqmts-Title 10 strike-thru 11-4-16 MB:bjs Page 8 of 19 31 2. a proportion of a recreational facility footprint when contained within a general use building as follows: the portion of the footprint area occupied by a recreational facility divided by the number of floors in that portion of the building; 3. vehicle circulation aisles between separate parking areas; 4. sidewalks; 5. paths; and 6. other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment. C. except for Senior citizen housing developments in HDR is exempt from development area coverage maximum; however, if the senior citizen housing is converted to regular apartments, the 50% limit must be met. D. The 50% maximum development area coverage for Ttownhouse development may be are -allowed --increased up to a maximum of 75% development area coverage, The if the applicant uses low -impact development techniques; that are technically feasible and in accordance with the Surface Water Design Manual (TMC Chapter 14.30) Section 11. TMC Section 18.52.030 Amended. Ordinance Nos. 2251 §62 and 1872 §14 (part), as codified at TMC Section 18.52.030, "Perimeter Landscape Types," are hereby amended to read as follows: 18.52.030 Perimeter Landscape Types A. Type I landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a Tight visual separation between uses and zoning districts, screen parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 30 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 7 lineal feet of required perimeter excluding curb cuts or a planted berm at least 24 inches high; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type I landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 9 of 19 32 B. Type 11 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a moderate visual separation between uses and zoning districts, screen blank building walls and parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 20 lineal feel of required perimeter excluding curb cuts; b. One shrub for each 5 lineal feet of required perimeter excluding curb cuts; c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type II landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. and and C. Type 111 landscape perimeter. 1. Purpose is to provide extensive visual separation between industrial areas and nearby residential areas. 2. Plant materials shall consist of the following: a. One tree per 20 lineal feet of required perimeter excluding curb cuts; and b. Shrubs to provide a solid planting screen with a height of five to eight feet or a solid wooden fence or masonry wall to be approved by the Community Development Director; and c. Living groundcover to cover 90a/o of the landscape area within three years. D. Plant material requirements. 1. Plants shall meet the current American Standard for Nursery Stock (American Nursery and Landscape Association — ANLA), and shall be healthy, vigorous and well - formed, with well -developed, fibrous root systems, free from dead branches or roots. Plants shall be free from damage caused by temperature extremes, lack of or excess moisture, insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good color. Plants shall be habituated to outdoor environmental conditions (hardened -off). 2. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 3. Deciduous trees shall be used to allow visual access to entryways, signage and pedestrian use areas. 4. Evergreen shrubs shall be used to screen parking lots along street frontages. 5. In perimeters located adjacent to residential zones 75% of trees and shrubs shall be evergreen. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 10 of 19 33 6. Evergreen trees shall be a minimum of 6 feet in height at time of planting. 7. Deciduous trees shall have at least a 2-inch caliper at time of planting, determined according to the American Standard for Nursery Stock. 8. Shrubs shall be at least 18 inches in height at time of planting. 9. No plants listed on the current King County Noxious Weed list may be used. 10. Existing vegetation may be used to meet the requirements of this chapter. All significant trees located within any required perimeter landscaping area which are not dead, dying, or diseased and which do not pose a safety hazard as determined by the Community Development Director shall be retained. 11. The classification of plant material as trees, shrubs and evergreens shall be as listed in the Hortus Third, A Concise Dictionary of Plants Cultivated in the U.S. and Canada. 12. Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant list or as administratively approved by the Director. Section 12. TMC Section 18.52.035 Amended. Ordinance Nos. 2442 §2, 2251 §63, 2235 §14 and 1872 §14 (part), as codified at TMC Section 18.52.035, "Interior Parking Lot Landscaping Requirements," are hereby amended to read as follows: 18.52.035 Interior Parking Lot Landscaping Requirements Landscaping within parking areas shall be provided as shown below. 1. Requirements for each distinctly separate parking area within the LDR zone for uses other than dwelling units, and in the MDR. and HDR zones: a. For areas with up to 20 parking stalls per parking area, no interior landscaping is required. b. For areas with 21 - 40 parking stalls per parking area, 7 square feet of interior landscape area is required for each parking stall. c. For areas with more than 40 parking stalls per parking area, 12 square feet of interior landscape area is required for each parking stall (see Multi -Family Design Guidelines, Site Planning Section, No. 31, for the normal 15 square feet to be provided). d. All parking areas shall have a perimeter landscape strip a minimum of 2 feet wide with an average width of 5 feet. 2. Requirements for parking lots within the 0, MUO, RCC, and NCC zones: a. For lots with up to 20 parking stalls, no interior landscaping is required. b. For lots with 21 - 40 parking stalls, a minimum of 10 square feet of interior landscape area is required for each parking stall over 20. W: Word Processing\ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 11 of 19 34 feet. c. For Tots with more than 40 parking stalls, a minimum of 200 square feet of interior landscape area plus 15 square feet for each parking stall over 40 is required. For areas placed behind buildings or otherwise screened from streets, parks and City trails the interior landscape requirement is reduced to a minimum of 200 square feet plus 10 square feet for each parking stall over 40. 3. Requirements for parking lots within the RC, RCM, C/LI, TSO and TVS zones: a. For areas adjacent to public or private streets, a minimum of 15 square feet of landscaping is required for each parking stall. b. For areas placed behind buildings or otherwise screened from streets, parks and City trails a minimum of 10 square feet of interior landscape area is required for each parking stall. 4. Planting Standards: a. Interior landscape islands shall be distributed to break up expanses of paving. Landscaped areas shall be placed at the ends of each interior row in the parking area, with no stall more than 10 stalls or 100 feet from a landscape area. Landscaped areas and planting islands may contain bioretention systems. b. The minimum size for interior parking lot planting islands is 100 square c. Planting islands shall be a minimum of 6 feet in any direction and generally the length of the adjacent parking space. d. Raised curbs or curb stops shall be used around the landscape islands to prevent plant material from being struck by automobiles. Where bioretention is used, curb cuts shall be placed to allow stormwater runoff from adjacent pavements to enter the bioretention system. e. A minimum of 1 evergreen or deciduous tree is required per landscape island, with the remaining area to contain a combination of shrubs, living groundcover and mulch. Section 13. TMC Section 18.56.040 Amended. Ordinance Nos. 2500 §24, 2368 §54, 2251 §66, 1795 §3 (part), and 1758 §1 (part), as codified at TMC Section 18.56.040, "General Requirements," are hereby amended to read as follows: 18.56.040 General Requirements Any required off-street parking and loading facilities shall be developed in accordance with the following standards: 1. LOCATION. Any on -premises parking area that contains parking stalls located more than 1,000 feet from the principal use shall require Hearing Examiner approval for the entire parking lot. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 12 of 19 35 2. MINIMUM -PARKING DIMENSIONS. Minimum parking area dimensions for surface and structured parking facilities shall be as provided in Figure 18-6. Standard and compact parking stalls shall be allowed a two -foot landscaping overhang to count towards the stall length. 3. TANDEM PARKING SPACES. In the MDR and HDR zones, tandem spaces (where one car is parked directly behind another) will be allowed for each three bedroom and 1/3 of all two bedroom units. No more than 1/3 of all project parking spaces may be tandem and all tandem parking spaces will be designed for full size rather than compact size vehicles based on the dimensions in Figure 18-6. 4. PARKING AREA AND PARKING AREA ENTRANCE AND EXIT SLOPES. The slope of off-street parking spaces shall not exceed 5%. The slope of entrance and exit driveways providing access for off-street parking areas and internal driveway aisles without parking stalls shall not exceed 15%. 5. DRIVEWAYS AND MANEUVERABILITY. a. Adequate ingress to and egress from each parking space shall be provided without moving another vehicle and without backing more than 50 feet. b. Turning and maneuvering space shall be located entirely on private property unless specifically approved by the Public Works Director. c. All parking spaces shall be internally accessible to one another without reentering adjoining public streets. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. d. When off-street parking is provided in the rear of a building and a driveway or lane alongside the building provides access to rear parking area, such driveway shall require a minimum width of twelve feet and a sidewalk of at least a three-foot section, adjoining the building, curbed or raised six inches above the driveway surface. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. e. Ingress and egress to any off-street parking lot shall not be located closer than 20 feet from point of tangent to an intersection. f. The Public Works Director or the Community Development Director may require ingress separate from an egress for smoother and safer flow of traffic. 6. The Director may require areas not designed or approved for parking to be appropriately marked and/or signed to prevent parking. 7. SURFACE. a. The surface of any required off-street parking or loading facility shall be paved with permeable pavement, which is the preferred material, or asphalt, concrete or other similar approved material(s) that maintains a durable uniform surface and shall be graded and drained as to dispose of all surface water, but not across sidewalks. b. Any parking stalls provided in excess of the required minimum shall use permeable pavement where technically feasible in accordance with the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 13 of 19 36 bc. All traffic -control devices, such as parking stripes designating car stalls, directional arrows or signs, bull rails, curbs and other developments shall be installed and completed as shown on the approved plans. ed. Paved parking areas shall use paint or similar devices to delineate car stalls and direction of traffic. de. Where pedestrian walks are used in parking Tots for the use of foot traffic only, they shall be curbed or raised six inches above the lot surface. ef. Wheel stops shall be required on the periphery of parking Tots so cars will not protrude into the public right-of-way, walkways, off the parking lot or strike buildings. Wheel stops shall be two feet from the end of the stall of head -in parking. 8. PARALLEL PARKING STALLS. Parallel parking stalls shall be designed so that doors of vehicles do not open onto the public right-of-way. 9. OBSTRUCTIONS. No obstruction that would restrict car door opening shall be permitted within five feet of the centerline of a parking space. 10. LIGHTING. Any lighting on a parking lot shall illuminate only the parking lot, designed to avoid undue glare or reflection on adjoining premises. 11. CURB -CUTS. All parking areas shall have specific entrance and/or exit areas to the street. The width of access roads and curb -cuts shall be determined by the Public Works Director. The edge of the curb -cut or access road shall be as required by the Public Works Director for safe movement of vehicles or pedestrians. Curb -cuts in single-family districts shall be limited to a maximum of 20 feet in width and the location shall be approved by the Public Works Director. 12. PARKING STALL. Parking stalls shall not be used for permanent or semi- permanent parking or storage of trucks or materials. Section 14. TMC Section 18.56.065 Amended. Ordinance Nos. 2368 §57, 2199 §19, and 1976 §62, as codified at TMC Section 18.56.065, "Residential Parking Requirements," are hereby amended to read as follows: 18.56.065 Residential Parking and Storage Requirements A. Parking and vehicle storage limitations on properties devoted to single-family residential use shall be as follows: 1. Motor vehicles on property devoted to single-family residential use shall be parked on an approved durable uniform surface that is designed to retain surface water on -site and without causing impacts. If necessary, surface water may drain to street if no other design is feasible. Motor vehicles, other than those specified in TMC Section 18.56.065.A.2, shall not be parked in setbacks except in front or secondary front -yard W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 14 of 19 37 setbacks from streets, when in a driveway that provides access to an approved parking location, and is in conformance with TMC Title 18, as that title currently exists or as it may be subsequently amended. Parking in the rear setback for a single-family home is permitted where the parking is connected to a rear alley. 2. Recreational vehicles, boats or trailers shall be parked, kept or stored on an approved durable uniform surface and shall not be parked, kept or stored in required front yard setbacks, except for a driveway. Recreational vehicle parking in the side or rear yard setbacks is allowed, provided no recreational vehicle is parked so as to prevent access by emergency responders to all sides of a structure. 3. No more than 50% of the front yard or 800 square feet, whichever is smaller, may be approved durable uniform surface. An approved durable uniform surface exceeding this requirement prior to August 25, 2004 may be maintained, but shall not be expanded. The Director of Community Development may approve exceptions to this requirement for an access driveway, particularly on pie -shaped or other odd shaped Tots where it is infeasible to meet this requirement. 4. Single-family properties on pre-existing, legal lots of record containing less than 6,500 square feet are exempt from the percentages noted in TMC Section 18.56.065.A.3. 5. No more than six motor vehicles shall be parked on a single-family residential property of 13,000 square feet or less outside of a carport or enclosed garage for a period of more than 48 hours. For purposes of this section, "single-family residential property" means any parcel containing a single-family residence or multiple parcels combined containing one single-family residence, typically identified by a single address located in the LDR zone. The parking limitations in this subsection shall apply to all motor vehicles as defined by state law with the exception of motorcycles and mopeds. B. Each unit in a townhouse development shall have an attached garage with parking for at least one vehicle or a parking space in an underground garage. C. Waiver from the requirement for number of required stalls. The Director shall have the discretion to waive the requirement to construct a portion of the off-street parking requirement if, based on a parking demand study, the property owner establishes that the dwelling will be used primarily to house residents who do not and will not drive due to a factor other than age. Such a study shall ensure that ample parking is provided for residents who can drive, guests, caregivers and other persons who work at the residence. If such a waiver is granted, the property owner shall provide a site plan, which demonstrates that in the event of a change of use,-whiehthat eliminates the reason for the waiver, there is ample room on the site to provide the number of off-street parking spaces required by this Code. In the event that a change of use or type of occupant is proposed that would alter the potential number of drivers living or working at the dwelling, the application for change of use shall be conditioned on construction of any additional off-street parking spaces required to meet the standards of this Code. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 15 of 19 38 Section 15. TMC Section 18.70.050 Amended. Ordinance Nos.. 2175 §1, 2077 §1, and 1819 §1 (part), as codified at TMC Section 18.70.050, "Nonconforming Structures," are hereby amended to read as follows: 18.70.050 Nonconforming Structures Where a lawful structure exists at the effective date of adoption of this title that could not be built under the terms of this title by reason of restrictions on area, lot soverage,development area, height, yards or other characteristics of the structure, it may be continued so long as the structure remains otherwise lawful subject to the following provisions: 1. No such structure may be enlarged or altered in such a way that increases its degree of nonconformity. Ordinary maintenance of a nonconforming structure is permitted, pursuant to TMC Section 18.70.060, including but not limited to painting, roof repair and replacement, plumbing, wiring, mechanical equipment repairlreplacement and weatherization. These and other alterations, additions or enlargements may be allowed as long as the work done does not extend further into any required yard or violate any other portion of this title. Complete plans shall be required of all work contemplated under this section. 2. Should such structure be destroyed by any means to an extent of more than 50% of its replacement cost at time of destruction, in the judgment of the City's Building Official, it shall not be reconstructed except in conformity with provisions of this title, except that in the LDR zone, structures that are nonconforming in regard to yard setbacks or sensitive area buffers, but were in conformance at the time of construction may be reconstructed to their original dimensions and location on the lot. 3. Should such structure be moved for any reason or any distance whatsoever, it shall thereafter conform to the regulations for the zone in which it is located after it is moved. 4. When a nonconforming structure, or structure and premises in combination, is vacated or abandoned for 24 consecutive months, the structure, or structure and premises in combination, shall thereafter be required to be in conformance with the regulations of the zone in which it is located. Upon request of the owner, the City Council may grant an extension of time beyond the 24 consecutive months. 5. Residential structures and uses located in any single-family or multiple - family residential zoning district and in existence at the time of adoption of this title shall not be deemed nonconforming in terms of bulk, use, or density provisions of this title. Such buildings may be rebuilt after a fire or other natural disaster to their original dimensions and bulk, but may not be changed except as provided in the non -conforming uses section of this chapter. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 16 of 19 39 6. Single-family structures in single- or multiple -family residential zone districts that have legally nonconforming building setbacks, shall be allowed to expand the ground floor only along the existing building line(s), so long as the existing distance from the nearest point of the structure to the property line is not reduced, and the square footage of new intrusion into the setback does not exceed 50% of the square footage of the current intrusion. 7. In wetlands, watercourses and their buffers, existing structures that do not meet the requirements of the Sensitive Areas Overlay District chapter of this title may be remodeled, reconstructed or replaced, provided that: a. The new construction does not further intrude into or adversely impact an undeveloped sensitive area or the required buffer; b. The new construction does not threaten the public health, safety or welfare; and c. The structure otherwise meets the requirements of this chapter. 8. In areas of potential geologic instability, coal mine hazard areas, and buffers, as defined in the Sensitive Areas Overlay District chapter of this title, existing structures may be remodeled, reconstructed or replaced, provided that: a. The new construction is subject to the geotechnical report requirements and standards of TMC Sections 18.45.120B and 18.45.120C; b. The new construction does not threaten the public health, safety or welfare; c. The new construction does not increase the potential for soil erosion or result in unacceptable risk or damage to existing or potential development or to neighboring properties; and d. The structure otherwise meets the requirements of this chapter. 9. A nonconforming use, within a nonconforming structure, shall not be allowed to expand into any other portion of the nonconforming structure. Section 16. TMC Figure 18-6, "Off -Street Parking Area Dimensions," Amended. Ordinance No. 1758 §1 (part), codified as Figure 18-6 in Title 18, is hereby amended to be shown as follows: W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Page 17 of 19 40 Off -Street Parking Area Dimensions TMC 18.56.040 A B C D E F Parking Angle Stall Width Stall Depth Aisle Width Curb Length Unit Width 1-way traffic 2-way traffic 1-way traffic 2-way traffic 0° 8* 8.5 8* 12 20 20* 28* 36* 8.5 12 20 23 29 37 30° 8* 8.5 9 9.5 15* 17 17.5 18 11 11 11 11 20 20 20 16* 17 18 41* 45 46 54* 54 55 20 10 47 56 45° 8* 8.5 9 9.5 17* 19.5 20 20 12.5 12.5 12 20 20 20 11.5* 12 12.7 46.5* 51.5 52 54* 59 60 12 20 13.4 52 60 60° 8* 8.5 9 9.5 18* 21 21 21 17.5* 17.5 17 'bra. 20 20 20 9.2* 9.8 10.4 53.5 59.5 59 56* 62 62 20 11 58.5 62 90° 8* 8.5 9 9.5 16* 19 19 19 24 24 23 22 25 25 24 8* 8.5 9 56* 62 61 57* 63 62 24 0.5 60 62 hese figures are for use with compact cars on y. Any bays that contain combined compact and normal spaces shall be designed for normal spaces. Curb Length (E) Aisle (D) 1 stall width or depth (B or C) L Aisle or Street Unit Width (F) Angled Parking W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 11-4-16 MB:bjs Parallel Parking Figure 18-6 Off -Street Parking Area Dimensions Page 18 of 19 41 fTh Section 17. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 18. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 19. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of , 2016. ATTEST/AUTHENTICATED: Christy O'Flaherty, MMC, City Clerk APPROVED AS TO FORM BY: Rachel B. Turpin, City Attorney Allan Ekberg, Mayor Filed with the City Clerk: Passed by the City Council: Published: Effective Date: Ordinance Number: W: Word Processing\Ordinances\Low Impact Development rqmts-Title 16 strike-thru 11-4-16 MB:bjs Page 19 of 19 42 f City of Tukwila City Council Utilities Committee UTILITIES COMMITTEE Meeting Minutes September 13, 2016 - 5:30 p.m. - Foster Conference Room, 6300 Building Councilmembers: Kathy Hougardy, Chair; Kate Kruller, Thomas McLeod Staff: Bob Giberson, Robin Tischmak, Mike Cusick, Ryan Larson, Minnie Dhaliwal, Pat Brodin, Peter Lau, Gail Labanara, Laurel Humphrey CALL TO ORDER: Committee Chair Hougardy called the meeting to order at 5:30 p.m. I. PRESENTATIONS II. BUSINESS AGENDA A. Bid Award: Crystal Springs Emergency Surface Water Repair Staff is seeking Council approval to award a contract to Hoffmann Construction Inc. in the amount of $203,361.00 for the Crystal Springs Emergency Surface Water Repair. Hoffman was the lowest bidder of nine bids received, and is under the Engineer's Estimate of $251,605. This project will construct a permanent repair of the surface water pipe at Crystal Springs Park, which was declared an emergency in July. Funds for the contract will come from the 2016 Annual Small Drainage Program. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. B. Amendments to Tukwila Municipal Code Chapter 14.30, Surface Water Management The City's current National Pollutant Discharge Elimination System (NPDES) permit requires the City to adopt either the 2012 Department of Ecology Surface Water Design Manual or an equivalent by December 31, 2016. The intent is to make Low Impact Development (LID) techniques the preferred and common approach to development and redevelopment. Following analysis, staff proposes adopting the 2016 King County Surface Water Design Manual (KCSWDM) and 2016 King County Stormwater Pollution Prevention Manual. Amendments are proposed to Chapter 14.30, Surface Water Management, of the Tukwila Municipal Code to adopt these manuals as well as add a section on waste receptacle requirements and catch basin labeling. The proposed amendments must be reviewed by the Department of Commerce and then will return for Council review and adoption. COMMITTEE DISCUSSION ONLY. 43 f "\ Utilities Committee Minutes September13, 2016 C. Amendments to Tukwila Municipal Code Title 18 - Zoning Staff is seeking Committee approval to forward proposed amendments to Tukwila Municipal Code Title 18, Zoning, to the Planning Commission to make recommendations back to the Utilities Committee later this year. The City's NPDES Phase II permit requires the City to review, * revise and make effective local development codes and standards to incorporate LID principles and best practices by December 31, 2016. Amendments have been prepared including cross - departmental review as well as feedback from the City's consultant on this project, Otak. COMMITTEE APPROVAL TO FORWARD TO THE PLANNING COMMISSION. D. Supplemental Agreement: Andover Park East Water & Sewer Replacement Staff is seeking Council approval of Supplemental Agreement No. 1 to Contract No. 15-116 with PACE Engineers, Inc. in the amount of $55,096.32 for the Andover Park East Water and Sewer Replacement Project. The supplement will provide for additional design, on -call construction management, and extends the contract to December 31, 2017. The supplemented contract is within the remaining construction management budget of $107,106.16. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 26, 2016 COMMITTEE OF THE WHOLE. E. Project Completion: Emergency Sewer Repair at 1200 Andover Park East Staff is seeking Council approval of project completion and release of retainage to the R.L. Alia Company in the amount of $168,669.76 for the CBD Sanitary Sewer Rehabilitation - Emergency Sewer Repair at 1200 Andover Park East. This project provided roadway excavation and sewer pipe replacement in an area of severe deterioration and was completed on May 11, 2016. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. F. Project Completion: Sewer Repair at 1227 Andover Park East Staff is seeking Council approval of project completion and release of retainage to the R.L. Alia Company in the amount of $109,213.68 for the CBD Sanitary Sewer Rehabilitation - Sewer Repair at 1227 Andover Park East. This project provided sewer pipe replacement in an area of severe deterioration and was completed on May 11, 2016. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. III. MISCELLANEOUS Councilmember Kruller raised a concern about a dangerous intersection at South 137th St and 34th Avenue South impacting children walking to school at Cascade View Elementary. In addition, there was a recent hit and run property damage accident at South 135th St and 34th Avenue South. Further discussion on these intersections will take place in Transportation Committee. Meeting adjourned at 6:03 p.m. Next meeting: Tuesday, September 27, 2016 1 it Committee Chair Approval Minutes by LH, Reviewed by GL 44 2 City of Tukwila City Council Utilities Committee UTILITIES COMMITTEE Meeting Minutes September27, 2016 - 5:30 p.m. - Foster Conference Room, 6300 Building Councilmembers: Kathy Hougardy, Chair; Kate Kruller, Thomas McLeod Staff: Bob Giberson, Robin Tischmak, Ryan Larson, Pat Brodin, Greg Villanueva, Gail Labanara, and Laurel Humphrey CALL TO ORDER: Committee Chair Hougardy called the meeting to order at 5:30 p.m. I. PRESENTATIONS II. BUSINESS AGENDA A. Supplemental Agreement: Crystal Springs Emergency Surface Water Repair Staff is seeking Council approval of Supplemental Agreement No. 1 to Contract No. 16-104 in the amount of $39,905.11 with KPG, Inc. for construction management services for the Crystal Springs Emergency Surface Water Repair project. KPG was selected from three firms due to experience with the City and the project design. Funds will come from the 2016 Annual Small Drainage Program. UNANIMOUS APPROVAL. FORWARD TO OCTOBER 1, 2016 REGULAR CONSENT AGENDA. B. Amendments to Tukwila Municipal Code Title 16, Grading The City's current National Pollutant Discharge Elimination System (NPDES) permit requires the *City make Low Impact Development (LID) techniques the preferred and common approach to development and redevelopment. Significant amendments are proposed to Title 16, Grading, of the Tukwila Municipal Code to be consistent with the changes made by the Department of Ecology's requirements . Changes are proposed in the areas of permit applications, erosion and sediment control, standards, inspections and hazard damage. Because the November 15, 2016 meeting will likely be cancelled, the Committee agreed that the draft ordinance including the amendments can go directly to the Committee of the Whole. UNANIMOUS APPROVAL. FORWARD TO NOVEMBER 28, 2016 COMMITTEE OF THE WHOLE. 45 f l Utilities Committee Minutes September13, 2016 111. MISCELLANEOUS Staff asked for Committee approval to forward the three ordinances relating to the NPDES permit (amending TMC Titles 14,16, and 18) to the November 28, 2016 Committee of the Whole as they are all related and can then move through Council review as a package. The Committee agreed, and Councilmember Kruller requested this be confirmed via formal motion. Motion was made by Councilmember Kruller and seconded by Councilmember McLeod to send all three ordinances to the November 28, 2016 Committee of the Whole. The ordinance relating to the Zoning Code, Title 18, is scheduled for the Planning Commission on October 27, 2016. Meeting adjourned at 5:56 p.m. Next meeting: Tuesday, October 11, 2016 Committee Chair Approval Minutes by LH, Reviewed by GL 46 "\ City of Tukwila Planning Commission PLANNING COMMISSION (PC) MINUTES Date: October 27, 2016 Time: 6:30 PM Location: Council Chambers Present: Vice Chair, Miguel Maestas; Commissioners, Mike Hansen, Louise Strander, Brooke Alford and Nhan Nguyen Absent: Chair, Sharon Mann and Commissioner Dennis Martinez Staff: Nora Gierloff, Deputy Director; and Wynetta Bivens, Planning Commission Secretary, Greg Villanueva, NPDES Coordinator and Ryan Larson, Senior Engineer Vice -Chair Maestas called the public hearing to order. He asked for a motion to amend the agenda to hear comments from the City's Deputy Police Chief Bruce Linton and Fire Chief Jay Wittwer on the Public Safety Bond Measure prior to the public hearing. Commissioner Strander moved and Commissioner Hanson seconded the motion. All were in favor. Bruce Linton, Deputy Police Chief, City of Tukwila said that he was not present to advocate for the Public Safety Bond Measure but was present to provide some information. He said there has been a lot of questions regarding where the information can be found on thepublic safety plan. He directed folks to the Tukwila website for information. There are links to a fact sheet, (which were handed out to the Commission), all the presentations provided to Council, a video presentation with a message from the Police and Fire Department and the Court. Deputy Police Chief Linton also offered to answer questions. Jay Wittwer, Fire Chief, City of Tukwila introduced himself and provided some history on his career. Chief Wittwer was available to answer questions. Planning Commission Public Hearing Adoption of Minutes: Commissioner Strander made a motion to adopt the 07/20/16 minutes. Commissioner Maestas seconded the motion and all were in favor. CASE NUMBER: L16-0050 APPLICANT: City of Tukwila, Department of Public Works REQUEST: Adoption of Low Impact Development Regulations and amendments to TMC Title 18, Zoning, and Title 8.25, Vehicle Storage and Parking on Single Family Residential Property, in order to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution —generating activities. LOCATION: City -Wide Vice -Chair Maestas opened the public hearing and swore in those wishing to provide testimony. 47 Page 2 Public Hearing Minutes October 27, 2016 Greg Villanueva, National Pollutant Discharge Elimination Systems (NPDES) Coordinator, City of Tukwila noted that the PC agenda packet staff report was prepared by Moira Bradshaw on amending the City's codes for required Low Impact Development (LID). Mr. Villanueva provided background on why the City is required to incorporate LID into its development codes. As the NPDES Coordinator he is responsible for management and implementation of the NPDES Phase II Permit. The Permit authorizes discharge of the surface water bodies of the state, Green River, and Duwamish River. The Permit requires all Washington state cities: 1) To update their codes and make effective LID principles and LID Best Management Practices, which involves amending Title 14 by adopting the 2016 King County Surface Water Design Manual and the 2016 Stormwater Pollution Prevention Manual, which the Public Works Department is currently doing. 2) Amend Title 16 Building and Construction, specifically 16.54 grading, which is currently being done. 3) And before the Commission tonight, Title 18, Zoning and Title 8.25 Vehicle Storage and Parking on Single Family Residential Property. Mr. Villanueva introduced Trista Kobluskie, with Otak Consultants, who the City contracted with to help with implementation of LID into the City's code. Trista Kobluskie, Stormwater Planner, Otak Consultants gave a presentation on LID and noted the following: • Why the code is being amended to incorporate LID? The municipal stormwater permit requires it. The goal is to make low impact development; the preferred and commonly used approach to site development in the city, which should replace the traditional way of developing sites if possible. This goal is required to be met by December 31, 2016, and implemented at the beginning of 2017 for development proposals. • What is LID? It's a set of site development principles; it prioritizes retention of native vegetation; reduction of impervious surfaces and managing stormwater close to its source. • Intent? To disturb less land, generate less stormwater, and have a smaller impact on receiving waters. • Technique Examples — parking area reduction; dedicating less land to automobile use; limiting development coverage or impervious surface coverage. • Some techniques to manage stormwater close to its source — bioretention, known as rain gardens; or permeable pavement • The goal of LID is to create an urban landscape that still functions with a natural hydrologic process. The Process used to get where we are today: • The Department of Ecology produced a guideline book, which the City followed. • Involvement and resources - Department of Community Development, Public Works, the Fire Marshal, Public Safety, City Attorney, and ordinances to determine what is appropriate for Tukwila. • Ecology requires participation from officials and community stakeholders because the scope of the changes is potentially large. • The following code titles were reviewed — 8, 14, 16, 17, and 18 which is the purpose of the public hearing. Ms. Kobluskie also provided a summary of her findings during review, such as Comp Plan goal 4.13, promotion of tree retention through the City, which she said was the most sought after goal of LID. • There have been several public outreach efforts throughout this process. A summary of proposed amendments was provided. It was noted that no changes are currently being proposed for the tree regulations as they are subject to amendments in a separate process to follow. 48 Page 3 Public Hearing Minutes October 27, 2016 Commissioner Hansen requested a walk -though of the proposed code amendments listed in the ordinance. Ms. Kobluskie addressed several questions for the Commission. Commissioner Strander made an inquiry on material surface use if a single-family resident were remodeling their driveway. Staff noted pervious concrete or pavement is going to be placed where feasible. ACTION ITEMS (2): Commissioner Hansen asked staff to clean up the language under section 18.50.085, Maximum Percent Development Area Coverage, paragraph C. Commissioner Alford recommended more flexibility for plant material requirements beyond the City's bioretention plant list. Commissioner Hansen suggested some revisions to the language regarding planting material. Russ Gaston, Engineer, Otak Consultant, responded to inquiries from the Commissioners. Ryan Larson, Senior Engineer, City of Tukwila also responded to inquiries from the Commissioners. There was no public testimony. The public hearing was closed. The Planning Commission deliberated. Commissioner Hansen made a motion recommending adoption of Case Number L16-0050, proposed ordinance code amendments. And the additional revised amendment, Section 11, C,12 to read: `Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant List, unless approved by the Director.' And forward to City Council for their approval. Commissioner Alford seconded the motion. All were in favor. Director's Report: • PC will meet 2nd Thursdays in November and December due to the holidays • An update of up -coming projects was given. The Landscaping Code Update is on the November 10 PC agenda. • The Congress for New Urbanism is holding their national conference in Seattle in 2017 and are doing a public service project in the city of the conference. The City applied to have these national experts look at the Tukwila International Blvd Transit Oriented Development. The City was approved and there will be a charrette for the City. On Feb 23-26 recommendations will be provided on physical design, code and policy changes the City could make in order to implement the vision laid out in the Comprehensive Plan. They will hold a series of workshops with community and stakeholder involvement. They will also give a presentation on their recommendations during the conference. • Revision to the By -Laws in progress and will come to the PC for their review. Adjourned: 8:35 PM Submitted by: Wynetta Bivens Planning Commission Secretary 49 / 1 City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director CHAIR, SHARON MANN; VICE -CHAIR, MIGUEL MAESTAS; COMMISSIONERS, MIKE HANSEN, LOUISE STRANDER, BROOKE ALFORI), NHAN NGUYEN AND DENNIS MARTINEZ PLANNING COMMISSION PUBLIC HEARING AGENDA OCTOBER 27, 2016 - 6:30 PM TUKWILA CITY HALL COUNCIL CHAMBERS Ca11 to order the public hearing Adopt the minutes from 7/28/16 Attendance IV. CASE NUMBER: APPLICANT: REQUEST: LOCATION: PLANNING COMMISSION PUBLIC HEARING L16-0050 City of Tukwila, Department of Public Works Adoption of Low Impact Development Regulations and amendments to TMC Title 18, Zoning, and Title 8.25, Vehicle Storage and Parking on Single Family Residential Property, in order to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution —generating activities. City -Wide V. DIRECTOR'S REPORT VI. ADJOURN Sample motions on the back Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov / 1 City trf T kw la Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director STAFF REPORT TO THE PLANNING COMMISSION Prepared October so, 2016 FILE NUMBERS: Li6-oo5o Low Impact Development Code Amendments E16-0008 SEPA Checklist REQUEST: Public Hearing regarding the proposed low impact development code changes to the Zoning and Vehicle Parking Storage regulations. Based on direction from the Planning Commission staff will revise the ordinances and then the Planning Commission's recommendations w€II be forwarded to the City Council for review. PUBLIC HEARING: October 27, 2016 LOCATION: City wide STAFF: Moira Bradshaw, Senior Planner ATTACHMENTS: Titles 8.25 and 18 Draft Ordinance Bioretention Plant List Introduction The National Pollutant Discharge Elimination System (NPDES) permit program, created in 1972 by the Clean Water Act (CWA), helps address water pollution by regulating point sources that discharge pollutants to waters of the United States. Due to recent regulatory changes at the Federal and State levels Tukwila needs to modify its regulations to better control water pollution. The City's NPDES Phase II permit allows the City to drain the collected surface water from its system into the Green River. The permit is conditioned upon the City reviewing, revising, and making effective changes to the City's development related codes, standards, and other enforceable documents. The stipulation is that the City incorporate into its development codes the low impact development (LID) principles and LID Best Management Practices no later than December 31, 2016. LID is a stormwater and land use management strategy that strives to mimic pre -disturbance natural hydrologic processes of infiltration, filtration, storage, evaporation and transpiration. It emphasizes conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov / Tukwila Planning Commission Staff Report Li6-oo5o Low Impact Development Code Changes BACKGROUND The Tukwila Planning Commission advises the Mayor and City Council on matters relating to land use, comprehensive planning and zoning (TMC2.36.o30.) Additionally, all code cities are required to adopt development regulations that are consistent with and implement the City's Comprehensive Plan. (RCW 35A.63.1o5) The Tukwila Comprehensive Plan has the following policies regarding surface water management and design. Any proposed regulation must implement and be consistent with these policies. Natural Environment Element 4.1.5 Develop and implement programs that encourage Tukwila residents and businesses to take active measures to protect and enhance Tukwila's natural environment. Such measure could include the use of Low Impact Development (LID) techniques, natural stream bank restoration, non -toxic lawn care, composting and recycling, among others. Natural Environment 4.8.1 Demonstrate implementation of low impact development techniques through grant funded public projects. Where feasible incorporate such techniques into City Capital facilities projects. Provide technical assistance to developers, and encourage the use of such techniques for storm water management. Natural Environment 4.8.2 Require that all proposed development applications identify hydrologic features, both on and off -site, that could be impacted by the project. Evaluate and prevent project impacts on on -site and off -site watercourses, wetlands, drainage features and springs to avoid adverse impacts to existing sensitive area hydrology. Shoreline 5.10.1 Design, locate and manage shoreline development including streets, flood control projects, surface water drainage and sewer systems, clearing and grading activities, and landscaping in a manner that minimizes opportunities for pollutants to enter the river, provides erosion control, and otherwise protects water quality. Utilities Element 12.1.26 Apply an adopted surface water design manual as the minimum requirement for all development projects and other actions that could cause or worsen flooding, erosion, water quality and habitat problems, for both upstream and downstream development. Utilities 12.1. 29 Encourage the retention and planting of trees for their beneficial effects on surface water runoff, including flow attenuation, water quality enhancements and temperature reduction. Page 2 of 6 / 1 t . Tukwila Planning Commission Staff Report Li6-oo5o Low Impact Development Code Changes DISCUSSION OF PROPOSED CHANGES The draft ordinance (Attachment A) contains proposed changes to the City's Vehicle Parking and Storage Section of the Tukwila Municipal Code (TMC) as well as a variety of changes to the Zoning Code. Below is a summary of each section of the draft ordinance. Section s. Vehicle Storage and Parking on Single-family Residential Property (TMC8.25) is being moved into the Zoning Code. Three chapters of the Zoning Code will be changed to include the items being moved - the Definitions, Low Density Residential — Basic Development Standards, and Off-street Parking Chapters. The existing standard is that no more than 1o9/0 of a lot's surface or 1,200 square feet, whichever is greater, be covered with a durable uniform surface (TMC 8.25.o2o(D).) That is proposed for replacement with the development coverage standard of 75% for single family homes. See the definition of "development area" below. See Sections 3, 7, and 14 below for how the other elements of existing TMC 8.25 are being carried over into the Zoning Code. Section 2. Lot coverage and development area are interchangeable terms and both are defined in the Zoning code. Development area is more prevalently used. "Lot coverage" is therefore being deleted and where it was used (See Section 15,) "development area" is substituted. Section 3. The definition of "Development area" is being modified to distinguish between pervious and impervious surfaces and provide an incentive to use pervious surfaces. The goal of low impact development is to preserve native soils and vegetation, hence the allowance for only 75% of new pervious surfaces/area. The exception for pedestrian and recreation space in MDR and HDR is being moved out of the Definition to the Supplemental Development Standards section (TMC 18.5o.) See Section 1o. Section 4. The definition for "native vegetation" is proposed for modification to allow a wider range of materials that may be used in planting plans. Section 5. The "durable uniform surface" definition is being moved from the Vehicle Parking and Storage Chapter (TMC8.25) to the Zoning Code and updated to reflect the goal of using pervious (or permeable) surfaces. Section 6. A "pervious surfaces" definition is being added in order to encompass low impact development materials. The Appendix shows images of pervious surfaces. Section 7. Page 3 of 6 Tukwila Planning Commission Staff Report Li6-ooso Low Impact Development Code Changes A "development area" standard is being proposed for single family development. Single family lots are divided into two categories: 75% on lots less than 13,00o square feet up to a maximum of 5,85o square feet and 45% for those equal to and larger than 13,000. A 5o% standard currently exists for multi -family and 75% exists for townhomes. Below is a table showing the development area coverage for single family homes permitted in 2015. amount of site impervious area - amount of total Structure other than pervious impervious Permit # Lot size coverage structures improvements area Lot coverage D15-0021 6,780 2276 710 2,986 0.44 D15-0157 98,446 1694 2345 4,039 0.04 D15-0161 9,459 1274 1308 2,582 0.27 D15-0163 9,400 2451 1279 3,730 0.40 D15-0285 15,387 3907 1455 2643 5,362 0.35 D15-0302 6,635 1870 1765 3,635 0.55 D13-179 4,218 1315 338 192 1653 0.39 Section 8. In the chapter for Residential Commercial Center Zone (RCC,) the development standards table has a description of what may be included in landscape areas. Bioretention facilities are being proposed for addition as they are a low impact development technique for landscape areas. Bioretention is defined in the 2016 Surface Water Design Manual, which is being adopted by the City as part of its update to the Surface Water Management Section of the TMC. It means, "A stormwater best management practice consisting of a shallow landscaped depression designed to temporarily store and promote infiltration or stormwater runoff. Standards for bioretention design, including soil mix, plants, storage volume and feasibility criteria are specified in the Design manual." Biorretention area use plants and soils to retain surface water and slowly absorb this water into the ground instead of into man-made pipes and area streams and the River. The proposed Biorretention Plant list is attached. Images of Biorretention facilities are contained in this Report's Appendix. Section 9. The proposed amended language is to update the code with respect to structural soils and to ensure that the standards reflect the best available science with respect to landscape health. Section 10 This section repeats the standards for development area that was noted in Section 7 above and includes the exception from the development area standard for pedestrian, landscape and recreation facilities in MDR and HDR. It also provides a reference to the Surface Water Design Manual for Page 4 of 6 Tukwila Planning Commission Staff Report Li6-oo5o Low Impact Development Code Changes evaluation of low impact development proposals. Minor changes in wording are incorporated to clarify standards without changing the substance for senior housing and townhouse developments. Section 11 and 12. Proposed language to allow Biorretention as a viable landscaping technique and references a City of Tukwila biorretention plant list. (See also Attachment B.) Section 13. Proposed language clarifies the off-street parking standards for low density residential development, references "pervious pavement" as the preferred surface for parking areas and adds a stipulation that any "additional" parking —that is any additional stalls greater than the minimum numbers - shall use pervious surfaces. Section 14. The Residential Parking Requirements section of the Zoning Code is being updated to: • Delete the reference to the number of stalls required as that exists in Figure 7 — "Required Number of Parking Spaces for Automobiles and Bicycles." • Include the standards from "Vehicle Parking and Storage Chapter of TMC (8.25.) See Section 1 above. • Eliminate a standard from TMC 8.25 that limits the amount of durable uniform surfaces to io% of a lot's area. The development area standard is being substituted for this requirement. See Section 7 above. • Eliminates the reference to "Vehicle Parking and Storage Section of the Public Peace and Morals Chapter (TMC 8.25) because that has all been brought into the Zoning Chapter. Section 15. Substitutes the term "development area" for "lot coverage." Section 16. Eliminates the largest size parking stall in order to minimize the amount of impervious surface that is allowed for automobile parking. REQUESTED ACTION Hold the public hearing on the proposed changes, deliberate and make a recommendation to the City Council. Page 5 of 6 Tukwila Planning Commission Staff Report Li6-ooso Low Impact Development Code Changes Appendix Bio-retention Images Pt , (,Il,. ( /, Asphalt paving half pervious half impervious Commercial example of bioretention facilih. Access street using pervious material Residential scale bioretention facility. Catch basin in place to drain overflow. Page 6 of 6 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, AMENDING VARIOUS ORDINANCES AS CODIFIED IN TUKWILA MUNICIPAL CODE (TMC) TITLE 18, "ZONING CODE," TO IMPLEMENT LOW IMPACT DEVELOPMENT REQUIREMENTS IN THE DESIGN AND REVIEW OF SURFACE WATER DRAINAGE ON DEVELOPMENT PROJECTS; REPEALING ORDINANCE NOS. 2495, 2371, 2251 §1 (PART) AND 2056 TO ELIMINATE TMC CHAPTER 8.25, "VEHICLE STORAGE AND PARKING ON SINGLE-FAMILY RESIDENTIAL PROPERTY"; REPEALING ORDINANCE NOS. 2075 §1 (PART) AND 1758 §1 (PART), TO ELIMINATE TMC SECTION 18.06.515, "LOT COVERAGE" (DEFINITION); PROVIDING FOR SEVERABILITY; AND ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila ("City") is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHEREAS, the Permit extends coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 1 of 19 WHEREAS, Section S5.C.4 of the Permit requires the City to implement and enforce a program to reduce pollutants in stormwater runoff by regulating new development, redevelopment and construction sites; and WHEREAS, a requirement of Section S5.C.4 of the Permit mandates the City reduce pollutants in stormwater by implementing Low Impact Development (LID) requirements through new and revised development codes by January 1, 2017; and WHEREAS, the City Council deems it necessary to update the code provisions in Title 8, "Public Peace, Morals and Safety," and Title 18, "Zoning," to remain in compliance with the Permit; and WHEREAS, on October 27, 2016, the Tukwila Planning Commission, following adequate public notice, held a public hearing to receive testimony concerning amending the Tukwila Municipal Code and at that meeting adopted a motion recommending the proposed changes; and WHEREAS, on November 28, 2016, the Tukwila City Council, following adequate public notice, held a public hearing to receive testimony concerning the recommendations of the Planning Commission; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. Repealer. Ordinance Nos. 2495, 2371, 2251 §1 (part), and 2056, as codified at Tukwila Municipal Code (TMC) Chapter 8.25, are hereby repealed, thereby eliminating TMC Chapter 8.25, "Vehicle Storage and Parking on Single -Family Residential Property," in its entirety. 8.25.010 Definition "Approved Durable Uniform Surface" is a durable uniform surface approved for the do not work their way to the surface of the rock. Alternate sized minus compacted rock 2. Concrete (4" Portland cement concrete) over gravel section as described in Section 8.25.010; or 3. Blacktop (2" asphalt concrete pavement) over gravel section as described in Section 8.25.010; or W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 2 of 19 on properties devoted to single family residential use hicles, other than those specified in TMC with TMC Title 18, as that title currently exists or as it may be subsequently amended. Parking in the rear setback of a single family -home is peeped -where --tom rking connected to a rcar alley. C. Recreational vehicles, boats or trailers shall be parked, kept or stored on an approved durable uniform surface and shall not be parked, kept or stored in required front yard setbacks, except for a driveway. Recreational vehicle parking in the side or rear yard ,Ie is parked so as to prevent access by emergency responders to all sides of a structure. D. Approved durable uniform surfaces outside of structures on site may cover a maximum of 1,200 square feet or 10% of the lot surface, whichever is greater. The Director E. No more than 50% of the front yard or 800 square feet, whichever is smaller, may be approved durable uniform surface. An approved durable uniform surface exceeding this requirement prior to August 25, 2004 may bc maintained, but shall not bc expanded. The Director of Community Development may approve exceptions to this requirement for an accccc driveway, particularly on pie shaped or other odd shaped lots where it is infeasible to meet this requirement. F. Single family properties on pre existing, legal lots of record containing less than 6,50 cg io eet ercentages- voted in T C Sontinn 8.25.020, f subparagraphs D and E. G. No morc than six motor vehicles shall bc parked on a single family residential property of 13,000 square feet or less outside of a carport or enclosed garage for a period of more than 18 hours. Fo ' , " ' " containing one single family residence, typically identified by a single address located in the Low Density zone. The parking limitations in this subsection shall apply to all motor „nhinlnc+ as clnfined by state law with the exception of motorcycles and mopeds. Section 2. Repealer. Ordinance Nos. 2075 §1 (part) and 1758 §1 (part), as codified at TMC Section 18.06.515, "Lot Coverage" (definition), are hereby repealed, thereby eliminating TMC Section 18.06.515. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 3 of 19 g Let -Coverage "Lot coverage" means the surface of the subject property covered with impervious surface, Section 3. TMC Chapter 18.06, "Definitions," Amended. Ordinance Nos. 2075 §1 (part) and 1758 §1 (part), as codified at TMC Section 18.06.215, "Development Area," are hereby amended to read as follows: 18.06.215 Development Area "Development area" means the impervious surface area plus 75% of any area of pervious hard surface. Section 4. TMC Chapter 18.06, "Definitions," Amended. Ordinance No. 2347 §21, as codified at TMC Section 18.06.586, "Native Vegetation," is hereby amended to read as follows: 18.06.586 Native Vegetation "Native vegetation" means plant species, other than noxious weeds, that are indigenous to the coastal region of the Pacific Northwest and that reasonably could be expected to have occurred naturally on the site. , Section 5. New Definition Adopted. A new section is hereby added to TMC Chapter 18.06, "Definitions," to read as follows: Durable Uniform Surface "Durable uniform surface" means a durable uniform surface approved for the storage of vehicles by the City and consists of: 1. Permeable pavement, such as grasscrete, porous pavers, permeable asphalt; or 2. Three inches of 3/8" to 1-1/4" crushed porous aggregate consisting of open - graded top course, base course, or similar material with 35-40% porosity. Mud or other fine materials should be prevented from working their way to the surface by the installation of a geotextile fabric, quarry spalls, or other approved materials below the porous aggregate; or 3. Concrete (4" minimum Portland cement concrete) over gravel section as described above and sloped to drain to prevent drainage impacts; or W: Word Processing\Ordinances\Low Impact Development rgmts-Title 18 strike-thru 10-4-16 MB:bjs Page 4 of 19 4. Blacktop (2" minimum asphalt concrete pavement) over gravel section as described above and sloped to drain to prevent drainage impacts; or 5. Any other configuration of materials approved by the City that maintains a durable uniform surface and prevents drainage impacts. Section 6. New Definition Adopted. A new section is hereby added to TMC Chapter 18.06, "Definitions," to read as follows: Pervious Hard Surface "Pervious hard surface" means permeable pavement or a green roof. Section 7. TMC Section 18.10.060 Amended. Ordinance Nos. 1971 §4 and 1758 §1 (part), as codified at TMC Section 18.10.060, "Basic Development Standards," are hereby amended to read as follows: 18.10.060 Basic Development Standards Development within the Low -Density Residential District shall conform to the following listed and referenced standards: LDR BASIC DEVELOPMENT STANDARDS Lot area, minimum 6,500 sq. ft. Average lot width (min. 20 ft. street frontage width), minimum 50 feet Development Area, maximum 75% on Tots less than 13,000 sq. ft. (only for single family up to a maximum of 5,850 sq. ft. development) 45% on lots greater than or equal to 13,000 sq. ft. Setbacks to yards (minimum): • Front _ 20 feet • Front, decks or porches 15 feet • Second front 10 feet • Sides 5 feet • Rear 10 feet Height, maximum 30 feet Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See 18.10.030 • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 5 of 19 Section 8. TMC Section 18.20.080 Amended. Ordinance Nos. 1976 §39, 1872 §3, and 1758 §1 (part), as codified at TMC Section 18.20.080, "Basic Development Standards," are hereby amended to read as follows: 18.20.080 Basic Development Standards Development within the Residential Commercial Center District shall conform to the following listed and referenced standards: RCC BASIC DEVELOPMENT STANDARDS Lot area, minimum 5,000 sq. ft. Lot area per unit (multi -family), minimum 3,000 sq. ft. Setbacks to yards (min.): • Front 20 feet • Second front 10 feet • Sides 5 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear 10 feet �....w.........._ „ -. „f . . Landscape requirements (minimum): All setback areas shall be landscaped. Required landscaping may include a mix of plant materials, bioretention facilities, pedestrian amenities and features, outdoor cafe -type seating and similar features, subject to approval. See Landscape, Recreation, Recycling/Solid Waste Space chapter for further requirements • Front 20 feet • Second front • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet 10 feet • Rear, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet Recreation space 200 sq. ft. per dwelling unit (1,000 sq. ft. min.) W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 6 of 19 Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Re ulations • Accessory dwelling unit See Accessory Use section of this chapter • Office, minimum 3 per 1,000 sq. ft. usable floor area • Retail, minimum 2.5 per 1,000 sq. ft. usable floor area • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations Performance Standards: Use, activity and operations within a structure or a site shall comply with (1) standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, (2) TMC Chapter 8.22, "Noise", and (3) adopted State and Federal standards for water quality and hazardous materials. In addition, all development subject to the requirements of the State Environmental Policy Act, RCW 43.21C, shall be evaluated to determine whether adverse environmental impacts have been adequately mitigated. Section 9. TMC Section 18.28.240 Amended. Ordinance No. 2443 §25, as codified at TMC Section 18.28.240, "General Landscaping," subparagraph B.3., "Soil Preparation and Planting," is hereby amended to read as follows: 18.28.240 General Landscaping 3. Soil Preparation and Planting. a. For trees and plants planted in sidewalks and parking Tots, or in limited areas of soil volume, Cornell University CU structural soils .(Cornell University "CU" product or similar) must be used to a preferred depth of 36 inches, to promote tree root growth and provide structural support to the paved area. Minimum soil volumes for tree roots shall be 750 square feet per tree (see specifications and sample plans for CU- Structural Soils). Trees and other landscape materials shall be directly planted per specifications in "CU Structural Soils — A Comprehensive Guide" or using current BMPs subject to administrative review and approval of the technical information report (TIR.) Suspended pavement systems (Silva Cells or similar) may also be used if approved. into a planting mix, approved by thc Director, that is installcd on top of thc structural soils. b. For soil preparation in bioretention areas, existing soils must be protected from compaction. Bioretention soil media must be prepared in accordance with standard specifications of the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30, to promote a proper functioning bioretention system. These W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 7 of 19 specifications shall be adhered to regardless of whether a stormwater permit is required from the City. bc. For all other plantings, soils must be prepared for planting in accordance with specifications to restore soil moisture holding capacity in accordance with TMC Chapter 16.54, Grading, BMP T5.13, "Post Construction Soil Quality and Depth," from the Washington Department of Ecology Stormwater Management Manual for Western or amended) regardless of whether a stormwater permit is required by the City. sd. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting to ensure soils are properly prepared. 4e. Installation of landscape plants must comply with best management practices including: (11) Planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball. (2) Root balls of potted and balled and burlapped (B&B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B&B plants prior to planting. (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3-inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns of perennial plants. Section 10. TMC Section 18.50.085 Amended. Ordinance Nos. 2199 §17, 1830 §28, and 1758 §1 (part), as codified at TMC Section 18.50.085, "Maximum Percent Development Area Coverage," are hereby amended to read as follows: 18.50.085 Maximum Percent Development Area Coverage A. In the LDIR zones the maximum percent development area coverage for a single- family development shall be as follows: 1. 75% on lots less than 13,000 square feet up to a maximum of 5,850 sq. ft.; and 2. 45% on lots greater than or equal to 13,000 square feet. B. In the MDR and HDR zones the maximum percent development area coverage shall be 50%, less the following surfaces: 1. the footprint of an exclusive recreational facility; W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 8 of 19 2. a proportion of a recreational facility footprint when contained within a general use building as follows: the portion of the footprint area occupied by a recreational facility divided by the number of floors in that portion of the building; 3. vehicle circulation aisles between separate parking areas; 4. sidewalks; 5. paths; and 6. other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment. C. except for Senior citizen housing developments in HDR is exempt from development area coverage maximum; however, if the senior citizen housing is converted to regular apartments, the 50% limit must be met. D. The 50% maximum development area coverage for Ttownhouse development may be arc allowed increased up to a maximum of 75% development area coverage,. The s incrcace from 50% to 75% if the applicant uses low -impact development techniques; that are technically feasible and in accordance with the Surface Water Design Manual (TMC Chapter 14.30) p cd site, :os f- or c easurzc a„d the drainage design meets all adopted codes. Section 11. TMC Section 18.52.030 Amended. Ordinance Nos. 2251 §62 and 1872 §14 (part), as codified at TMC Section 18.52.030, "Perimeter Landscape Types," are hereby amended to read as follows: 18.52.030 Perimeter Landscape Types A. Type I landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a light visual separation between uses and zoning districts, screen parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 30 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 7 lineal feet of required perimeter excluding curb cuts or a planted berm at least 24 inches high; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type I landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 9 of 19 B. Type 11 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a moderate visual separation between uses and zoning districts, screen blank building walls and parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 20 lineal feet of required perimeter excluding curb cuts; b. One shrub for each 5 lineal feet of required perimeter excluding curb cuts; c. Living groundcover to cover 90% of the landscape area within three years. 3. Biorelention may be used as a Type II landscape perimeter, provided the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided public safety is not compromised. and and C. Type 111landscape perimeter. 1. Purpose is to provide extensive visual separation between industrial areas and nearby residential areas. 2. Plant materials shall consist of the following: a. One tree per 20 lineal feet of required perimeter excluding curb cuts; and b. Shrubs to provide a solid planting screen with a height of five to eight feet or a solid wooden fence or masonry wall to be approved by the Community Development Director; and c. Living groundcover to cover 90% of the landscape area within three years. D. Plant material requirements. 1. Plants shall meet the current American Standard for Nursery Stock (American Nursery and Landscape Association — ANLA), and shall be healthy, vigorous and well - formed, with well -developed, fibrous root systems, free from dead branches or roots. Plants shall be free from damage caused by temperature extremes, lack of or excess moisture, insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good color. Plants shall) be habituated to outdoor environmental conditions (hardened -off). 2. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 3. Deciduous trees shall be used to allow visual access to entryways, signage and pedestrian use areas. 4. Evergreen shrubs shall be used to screen parking lots along street frontages. 5. In perimeters located adjacent to residential zones 75% of trees and shrubs shall be evergreen. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 10 of 19 6. Evergreen trees shall be a minimum of 6 feet in height at time of planting. 7. Deciduous trees shall have at least a 2 inch caliper at time of planting, determined according to the American Standard for Nursery Stock. 8. Shrubs shall be at least 18 inches in height at time of plantiing. 9. No plants listed on the current King County Noxious Weed list may be used. 10. Existing vegetation may be used to meet the requirements of this chapter. All significant trees located within any required perimeter landscaping area which are not dead, dying, or diseased and which do not pose a safety hazard as determined by the Community Development Director shall be retained. 11. The classification of plant material as trees, shrubs and evergreens shall be as listed in the Hortus Third, A Concise Dictionary of Plants Cultivated in the U.S. and Canada. 12. Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant list. or\ 0,(1),, Section 12. TMC Section 18.52.035 Amended. Ordinance Nos. 2442 §2, 2251 §63, 2235 §14 and 1872 §14 (part), as codified at TMC Section 18.52.035, "Interior Parking Lot Landscaping Requirements," are hereby amended to read as follows: 18.52.035 Interior Parking Lot Landscaping Requirements Landscaping within parking areas shall be provided as shown below. 1. Requirements for each distinctly separate parking area within the LDR zone for uses other than dwelling units, and in the MDR and HDR zones: a. For areas with up to 20 parking stalls per parking area, no interior landscaping is required. b. For areas with 21 - 40 parking stalls per parking area, 7 square feet of interior landscape area is required for each parking stall. c. For areas with more than 40 parking stalls per parking area, 12 square feet of interior landscape area is required for each parking stall (see Multi -Family Design Guidelines, Site Planning Section, No. 31, for the normal 15 square feet to be provided). d. All parking areas shall have a perimeter landscape strip a minimum of 2 feet wide with an average width of 5 feet. 2. Requirements for parking lots within the 0, MUO, RCC, and NCC zones: a. For lots with up to 20 parking stalls, no interior landscaping is required. b. For lots with 21 - 40 parking stalls, a minimum of 10 square feet of interior landscape area is required for each parking stall over 20. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 11 of 19 c. For lots with more than 40 parking stalls, a minimum of 200 square feet of interior landscape area plus 15 square feet for each parking stall over 40 is required. For areas placed behind buildings or otherwise screened from streets, parks and City trails the interior landscape requirement is reduced to a minimum of 200 square feet plus 10 square feet for each parking stall over 40. 3. Requirements for parking Tots within the RC, RCM, C/LI, TSO and TVS zones: a. For areas adjacent to public or private streets, a minimum of 15 square feet of landscaping is required for each parking stall. b. For areas placed behind buildings or otherwise screened from streets, parks and City trails a minimum of 10 square feet of interior landscape area is required for each parking stall. 4. Planting Standards: a. Interior landscape islands shall be distributed to break up expanses of paving. Landscaped areas shall be placed at the ends of each interior row in the parking area, with no stall more than 10 stalls or 100 feet from a landscape area. Landscaped areas and planting islands may contain bioretention systems. b. The minimum size for interior parking lot planting islands is 100 square feet. c. Planting islands shall be a minimum of 6 feet in any direction and generally the length of the adjacent parking space. d. Raised curbs or curb stops shall be used around the landscape islands to prevent plant material from being struck by automobiles. Where bioretention is used, curb cuts shall be placed to allow stormwater runoff from adjacent pavements to enter the bioretention system. e. A minimum of 1 evergreen or deciduous tree is required per landscape island, with the remaining area to contain a combination of shrubs, living groundcover and mulch. Section 13. TMC Section 18.56.040 Amended. Ordinance Nos. 2500 §24, 2368 §54, 2251 §66, 1795 §3 (part), and 1758 §1 (part), as codified at TMC Section 18.56.040, "General Requirements," are hereby amended to read as follows: 18.56.040 General Requirements Any required off-street parking and loading facilities shall be developed in accordance with the following standards: 1. LOCATION. Any on -premises parking area that contains parking stalls located more than 1,000 feet from the principal use shall require Hearing Examiner approval for the entire parking lot. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 12 of 19 2. MGM -PARKING DIMENSIONS. Minimum parking area dimensions for surface and structured parking facilities shall be as provided in Figure 18-6. Standard and compact parking stalls shall be allowed a two -foot landscaping overhang to count towards the stall length. 3. TANDEM PARKING SPACES. In the MDR and HDR zones, tandem spaces (where one car is parked directly behind another) will be allowed for each three bedroom and 1/3 of all two bedroom units. No more than 1/3 of all project parking spaces may be tandem and all tandem parking spaces will be designed for full size rather than compact size vehicles based on the dimensions in Figure 18-6. 4. PARKING AREA AND PARKING AREA ENTRANCE AND EXIT SLOPES. The slope of off-street parking spaces shall not exceed 5%. The slope of entrance and exit driveways providing access for off-street parking areas and internal driveway aisles without parking stalls shall not exceed 15%. 5. DRIVEWAYS AND MANEUVERABILITY. a. Adequate ingress to and egress from each parking space shall be provided without moving another vehicle and without backing more than 50 feet. b. Turning and maneuvering space shall be located entirely on private property unless specifically approved by the Public Works Director. c. All parking spaces shall be internally accessible to one another without reentering adjoining public streets. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. d. When off-street parking is provided in the rear of a building and a driveway or lane alongside the building provides access to rear parking area, such driveway shall require a minimum width of twelve feet and a sidewalk of at least a three-foot section, adjoining the building, curbed or raised six inches above the driveway surface. This standard does not apply to single family, duplex, triplex, fourplex or townhouse uses. e. Ingress and egress to any off-street parking lot shall not be located closer than 20 feet from point of tangent to an intersection. f. The Public Works Director or the Community Development Director may require ingress separate from an egress for smoother and safer flow of traffic. 6. The Director may require areas not designed or approved for parking to be appropriately marked and/or signed to prevent parking. 7. SURFACE. a. The surface of any required off-street parking or loading facility shall be paved with permeable pavement, which is the preferred material, or asphalt, concrete or other similar approved material(s) that maintains a durable uniform surface and shall be graded and drained as to dispose of all surface water, but not across sidewalks. b. Any parking stalls provided in excess of the required minimum shall use permeable pavement where technically feasible in accordance with the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 13 of 19 bc. All traffic -control devices, such as parking stripes designating car stalls, directional arrows or signs, bull rails, curbs and other developments shall be installed and completed as shown on the approved plans. ed. Paved parking areas shall use paint or similar devices to delineate car stalls and direction of traffic. de. Where pedestrian walks are used in parking lots for the use of foot traffic only, they shall be curbed or raised six inches above the lot surface. ef. Wheel stops shall be required on the periphery of parking lots so cars will not protrude into the public right-of-way, walkways, off the parking lot or strike buildings. Wheel stops shall be two feet from the end of the stall of head -in parking. 8. PARALLEL PARKING STALLS. Parallel parking stalls shall be designed so that doors of vehicles do not open onto the public right-of-way. 9. OBSTRUCTIONS. No obstruction that would restrict car door opening shall be permitted within five feet of the centerline of a parking space. 10. LIGHTING. Any lighting on a parking lot shall illuminate only the parking lot, designed to avoid undue glare or reflection on adjoining premises. 11. CURB -CUTS. All parking areas shall have specific entrance and/or exit areas to the street. The width of access roads and curb -cuts shall be determined by the Public Works Director. The edge of the curb -cut or access road shall be as required by the Public Works Director for safe movement of vehicles or pedestrians. Curb -cuts in single-family districts shall be limited to a maximum of 20 feet in width and the location shall be approved by the Public Works Director. 12. PARKING STALL. Parking stalls shall not be used for permanent or semi- permanent parking or storage of trucks or materials. • Section 14. TMC Section 18.56.065 Amended. Ordinance Nos. 2368 §57, 2199 §19, and 1976 §62, as codified at TMC Section 18.56.065, "Residential Parking Requirements," are hereby amended to read as follows: 18.56.065 Residential Parking and Storage Requirements A. Two off street parking spaces shall be provided for each dwelling unit which for every two bedrooms in exccsc of three bcdrooms in a dwelling unit (i.c., four and five bedroom dwelling units shall have three off street parking spaces, six and seven bedroom homes shall have four spaces, and so on). A. Parking and vehicle storage limitations on properties devoted to single-family residential use shall be as follows: 1. Motor vehicles on property devoted to single-family residential use shall be parked on an approved durable uniform surface that is designed to retain surface water on -site and without causing impacts. If necessary, surface water may drain to street if no other design is feasible. Motor vehicles, other than those specified in TMC Section 18.56.065.A.2, shall not be parked in setbacks except in front or secondary front -yard W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 14 of 19 setbacks from streets, when in a driveway that provides access to an approved parking location, and is in conformance with TMC Title 18, as that title currently exists or as it may be subsequently amended. -Parking in the rear setback for a single-family home is permitted where the parking is connected to a rear alley. 2. Recreational vehicles, boats or trailers shall be parked, kept or stored on an approved durable uniform surface and shall not be parked, kept or stored in required front yard setbacks, except for a driveway. Recreational vehicle parking in the side or rear yard setbacks is allowed, provided no recreational vehicle is parked so as to prevent access by emergency responders to all sides of a structure. 3. No more than 50% of the front yard or 800 square feet, whichever is smaller, may be approved durable uniform surface. An approved durable uniform surface exceeding this requirement prior to August 25, 2004 may be maintained, but shall not be expanded. The Director of Community Development may approve exceptions to this requirement for an access driveway, particularly on pie -shaped or other odd shaped lots where it is infeasible to meet this requirement. 4. Single-family properties on pre-existing, legal lots of record containing less than 6,500 square feet are exempt from the percentages noted in TMC Section 18.56.065.A.3. 5. No more than six motor vehicles shall be parked on a single-family residential property of 13,000 square feet or less outside of a carport or enclosed garage for a period of more than 48 hours. For purposes of this section, "single-family residential property" means any parcel containing a single-family residence or multiple parcels combined containing one single-family residence, typically identified by a single address located in the LDR zone. The parking limitations in this subsection shall apply to all motor vehicles as defined by state law with the exception of motorcycles and mopeds. B. Each unit in a townhouse development shall have an attached garage with parking for at least one vehicle or a parking space in an underground garage. C. Waiver from the requirement for number of required stalls. The Director shall have the discretion to waive the requirement to construct a portion of the off-street parking requirement if, based on a parking demand study, the property owner establishes that the dwelling will be used primarily to house residents who do not and will not drive due to a factor other than age. Such a study shall ensure that ample parking is provided for residents who can drive, guests, caregivers and other persons who work at the residence. If such a waiver is granted, the property owner shall provide a site plan, which demonstrates that in the event of a change of use, which eliminates the reason for the waiver, there is ample room on the site to provide the number of off-street parking spaces required by this Code. In the event that a change of use or type of occupant is proposed that would alter the potential number of drivers living or working at the dwelling, the application for change of use shall be conditioned on construction of any additional off- street parking spaces required to meet the standards of this Code. D. Parking in a L ew Density Residential (r)R) zone is subject to vehicle storage and parking regulations listed under TMC Chapter 8.25. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 15 of 19 Section 15. TMC Section 18.70.050 Amended. Ordinance Nos. 2175 §1, 2077 §1, and 1819 §1 (part), as codified at TMC Section 18.70.050, "Nonconforming Structures," are hereby amended to read as follows: 18.70.050 Nonconforming Structures Where a lawful structure exists at the effective date of adoption of this title that could not be built under the terms of this title by reason of restrictions on area, lot covee,development area, height, yards or other characteristics of the structure, it may be continued so long as the structure remains otherwise lawful subject to the following provisions: 1. No such structure may be enlarged or altered in such a way that increases its degree of nonconformity. Ordinary maintenance of a nonconforming structure is permitted, pursuant to TMC Section 18.70.060, including but not limited to painting, roof repair and replacement, plumbing, wiring, mechanical equipment repair/replacement and weatherization. These and other alterations, additions or enlargements may be allowed as long as the work done does not extend further into any required yard or violate any other portion of this title. Complete plans shall be required of all work contemplated under this section. 2. Should such structure be destroyed by any means to an extent of more than 50% of its replacement cost at time of destruction, in the judgment of the City's Building Official, it shall not be reconstructed except in conformity with provisions of this title, except that in the LDR zone, structures that are nonconforming in regard to yard setbacks or sensitive area buffers, but were in conformance at the time of construction may be reconstructed to their original dimensions and location on the lot. 3. Should such structure be moved for any reason or any distance whatsoever, it shall thereafter conform to the regulations for the zone in which it is located after it is moved. 4. When a nonconforming structure, or structure and premises in combination, is vacated or abandoned for 24 consecutive months, the structure, or structure and premises in combination, shall thereafter be required to be in conformance with the regulations of the zone in which it is located. Upon request of the owner, the City Council may grant an extension of time beyond the 24 consecutive months. 5. Residential structures and uses located in any single-family or multiple - family residential zoning district and in existence at the time of adoption of this title shall not be deemed nonconforming in terms of bulk, use, or density provisions of this title. Such buildings may be rebuilt after a fire or other natural disaster to their original dimensions and bulk, but may not be changed except as provided in the non -conforming uses section of this chapter. W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 16 of 19 6. Single-family structures in single- or multiple -family residential zone districts that have legally nonconforming building setbacks, shall be allowed to expand the ground floor only along the existing building line(s), so long as the existing distance from the nearest point of the structure to the property line is not reduced, and the square footage of new intrusion into the setback does not exceed 50% of the square footage of the current intrusion. 7. In wetlands, watercourses and their buffers, existing structures that do not meet the requirements of the Sensitive Areas Overlay District chapter of this title may be remodeled, reconstructed or replaced, provided that: a. The new construction does not further intrude into or adversely impact an undeveloped sensitive area or the required buffer; b. The new construction does not threaten the public health, safety or welfare; and c. The structure otherwise meets the requirements of this chapter. 8. In areas of potential geologic instability, coal mine hazard areas, and buffers, as defined in the Sensitive Areas Overlay District chapter of this title, existing structures may be remodeled, reconstructed or replaced, provided that: a. The new construction is subject to the geotechnical report requirements and standards of TMC Sections 18.45.120B and 18.45.120C; b. The new construction does not threaten the public health, safety or welfare; c. The new construction does not increase the potential for soil erosion or result in unacceptable risk or damage to existing or potential development or to neighboring properties; and d. The structure otherwise meets the requirements of this chapter. 9. A nonconforming use, within a nonconforming structure, shall not be allowed to expand into any other portion of the nonconforming structure. Section 16. TMC Figure 18-6, "Off -Street Parking Area Dimensions," Amended. Ordinance No. 1758 §1 (part), codified as Figure 18-6 in Title 18, is hereby amended to be shown as follows: W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 17 of 19 Off -Street Parking Area Dimensions TMC 18.56.040 A B C D E F Parking Angle Stall Width Stall Depth Aisle Width Curb Length Unit Width 1-way traffic 2-way traffic 1-way traffic 2-way traffic 0° 8* 8.5 8* 12 20 20* 28* 36* 8.5 12 20 23 29 37 30° 8* 8.5 9 9.5 15* 17 17.5 18 11 11 11 11 20 20 20 20 16* 17 18 41* 45 46 54* 54 55 19 47 56 45° 8* 8.5 9 9.5 17* 19.5 20 20 12.5 12.5 12 20 20 20 11.5* 12 12.7 46.5* 51.5 52 54* 59 60 12 20 13.4 52 60 60° 8* 8.5 9 9.5 18* 21 21 21 17.5* 17.5 17 16.5 20 20 20 9.2* 9.8 10.4 53.5 59.5 59 56* 62 62 20 11 58.5 62 90° 8* 8.5 9 9.5 16* 19 19 19 24 24 23 22 25 25 24 8* 8.5 9 56* 62 61 57* 63 62 24 9.5 60 62 ese figures are for use with compact cars only. Any bays that contain combined compact and normal spaces shall be designed for normal spaces. Curb Length (E) Aisle (D) f stall width or depth (B or C) Aisle or Street \ A Stall Depth Perpendicular to Aisle (C) Curb length (E) • • Unit Width (F) Angled Parking Parallel Parking Figure 18-6 Off -Street Parking Area Dimensions W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 18 of 19 Section 17. Corrections by City Clerk or Code Reviser. Upon approval of the City Attorney, the City Clerk and the code reviser are authorized to make necessary corrections to this ordinance, including the correction of clerical errors; references to other local, state or federal laws, codes, rules, or regulations; or ordinance numbering and section/subsection numbering. Section 18. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 19. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force on December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of , 2016. ATTEST/AUTHENTICATED: Christy O'Flaherty, MMC, City Clerk APPROVED AS TO FORM BY: Rachel B. Turpin, City Attorney Allan Ekberg, Mayor Filed with the City Clerk: Passed by the City Council: Published: Effective Date: Ordinance Number: W: Word Processing\Ordinances\Low Impact Development rqmts-Title 18 strike-thru 10-4-16 MB:bjs Page 19 of 19 CITY OF TUKWILA PREFERRED BIORETENTION PLANTS DRAFT - SEPTEMBER 15, 2016 Attachment B Staff Report L16-0050 0 PLANTING ZONES for BIORETENTION CELLS ZONE 1 Plants in Zone 1 can tolerate moist soils and standing water. Zone 1 is the bottom of the bioretention cell. Plants in Zone 2 can tolerate moist soils and occasional standing water. Zone 2 is typically side - slopes and banks. Plants in Zone 3 can prefer drier planting conditions. Zone 3 is the highest point of the biorentention cell. Note about Plant Spacing: he Biorentention Plant List gives an appproximate spacing guide for plants based on type of - !ant and mature, but it is always best to follow plant specific recommendations when spacing" Depending n the soil mix, plantings in biorentention cells fypicalljr, each mature size more quickly that when planted In ther locations. BIORETENTION CELL DIAGRAM BIORETENTION CELL SECTION rims Scientific Name Common Name �• ° vY' . k -k Ay +a" Fru r. .e- r. .{ .. t.1 hh7. c{'. s..:+ '� _ fi• �.k �5"s`J t .. ".z M . �',...,„ ` :,�., Carexobnupta . _ 7 to Slough sedge ti 1 1 Zone 2 •P.l: : 10. `•' +: 2 3 ti 1 Native r ^ i �1in1�k F R Sun Exposure Mature T Height 'z'i c' .a 12"- 36" Size Spread r taK .w3., %"k " - ems up to 48" On Center Spacing ems' � " yr 36" Fail Color F -z-� �-w^a,, "� nAr b ! Bloom Time & Color KR ; y1 ,� r r Late Spring Characteristics rrs � c'brr ,J,§, s*F-,yC .iy • Spreads quickly; excellent soil binder Sun ti r 'gyp ,g.. �.,.. Partial •� y �iYF Yd �.,r Shade '" '; ` i ;,am Carex oshimensis " y EvergOld' 1 } Varie tedJa Japanese 1 . g p e.; *.tI' � Sedge 2 3 di 1 y _ 24" 24, _ 36" 28"-Early Late Spring Summer Variegated leaves with white band; great for planting along sidewalk edges • t. , J; ; Carex stipata Sawbeak Sedge tia1, 1 24'-36' 24"-36" 28" Spring Spends quickly; long, tapered foliage f t+ •' 3j ��. �4 Juncus acuminatus Taper -tipped Rush 1 6" -18" 12"- 24" 18" Spring - Summer Red -brown flowers; delicate 4 i ' •y y Juncus ensifolius , ti i Dagger -lead Rush t •� A' i' , 1 6"-Pom-pom 15" 6"-9" 6" Summer like Flowers; adds interest to landscape #c1 �•. 1 Juncus tennis Slender Rush 1 2 3' ; 6"-20" 6"-30" 22" Late Spring Lateto Summer erightgreenfoliage 1 Scirpus acutus Hardstem Bulrush 1 10' 6' 4' Summer Gray -green to dark green foliage; dense ; SCirpusm!crocarpus \1` Small -fruited Bulrushegi 1 24 36" 12"-24" 18" Summer Spreads quickly; excellent soil binder 1 0 0 ORNAMENTAL h( c (1 Inc PLANTS Aster chilensis California Aster I Zone 2 2 3 3 N:'; Sun - Exposure "- Mature -- 24"-36" Size - 18"-36" On Center SpJw+inn +. ` 18"-28" ' Fall Color Bloom Time & Color Late Summer Ilk Characteristics Low -growing plant; shear when bloomingceases in the autumn, returns in the spring - r �.. , -A Aquilegia formosa Western Columbine 2 3 ila 12"-36" 12"-36" 18"-28" Spring Excellent in wooland areas; attracts pollinators; tolerant of shallow flooding },',- Arctostaphylos e.ia Uvp-UISI !w { ,.� < Kinnikinnick or ' .�,I .. Bearberry 2 3 6"- 12" 24••_ 36" 18"-28" Spring - Summer Glossy, leathery leaves; low- growing ground cover; easy -care once established; bell -shaped flowers; red berries Asarum caudatum Wild ginger 2 3 4"-6" 36" 18"-28" Late Spring Glossy leaves that exude the fragranceofgingerwhencrushed Athyrium i [ ! filix-femina Tr? Lady fern 1 2 3 di iii 36"-60" 24" 12"-18" Fast-growin 'tooldei�antofshallow g > _ T F i . • — Blechnum spicant 1r_t �i Deer fern 1 2 3 l 12"-36" 24" 12"-18' Late Spring Dark, glossy leaves with a crinkled texture; tolerant of shallow flooding lipit4. -ti Camassia leichtlinii '; Leichtlin's camass i a 2 3 abl 36"-48" 12"-24" 12"-16" Late Spring Linear foliage; flowers range in color from white, cream, blue or purple; excellent fresh -cut flower Camassia quamash Common camass 2 3 18" 12" 6"-9' Late Spring Distinct clusters of flowers make this plant attractive in mass plantings; best when planted in the autumn after weather cools 2 ' SrliVnt< 1Late ` " •• 4 • ft; ^Yi .:x, Scientific Name Cnmman Name ' 5 •_..�i' Corms canadensis Bunchberry _ 1 Zone 2 i.q�y�.., 2 3 3 Native ^ i Sun Sun Exposure Mature Height 3, �4R 6-9" Size Spread i' "k,D I�Q'se4 6-9" On Center Spacing J 4 1 4.5J" Fall Color I -q �'''-� irY'aaeJ1 Bloom I Time & Color ,`�.5� S Spring Characteristics +. I.ii�6y l' {jl Performs best in full shade; excellent complement to rhododendrons or ferns Partial /{)+k r ��-y — Shade 71 ($ P w�''^,L'S^ '. .nw• ,.r ' * ` *r Dicentra formosa ** i 4 Pacific Bleeding Heart 2 3 fit, AI 12" 24" 12"-18' Spring Delicate foliage; disrincrs rin 9l P 9 time Bowers • Descham sia P cespirosa Tufted hair grass 2 3 6"-12" 24" 12"-18" Spring Stunning grassy foliage with creamy white variegation that turns pink in winter; spring -time inflorescence can make plant 4'-tall r. 4Summer wr". '� lit "r-. i. , .; Fragaria chiloensis Beach Strawberry11111 2 3 a f 10" 36" 18"-28" Forms a lush, compact groundcover; cut back in the early spring to prompt new growth and prevent stem build-up; ornamental berries Fragaria vesca Alpine Strawberry 2 3filli 10" 36" 18'-28" Bears tiny, fragrant (and edible) berries in the summer months; attracts butterflies; likes some afternoon shade , '''z'a-> itit Festuca idahoensis t, Idaho Fescue 3 y, ''`ith" 24" 24" 12" 18" Summer ®. Dense plant; gray -green foliage; excellent when planted alongside sidewalksorusedasaground- cover - - ';- Hemerocallis i `�� Daylily 2 2 24"-48" 24" 12"-18" Spring- Summer a Attracts pollinators; Bower color dependent on cultivar(pink, red, orange, purple, yellow) • 1' ,. Heuchera varieties Alumroot 2 3 24"-36" 18" 9"-14" Spring- Summer Many cultivars available; dintinct foliage and flower colors of chartreuse, white, and scarlet 3 Scientific Name rammon Nauru' ) '. Iris douglasiana acY Douglas Iris �,a l t Zone 2 2 3 1 i Native II Sun Sun 1 Exposure Putial I h�ude Mature — Hergi?t 24" Size — Spread 24" On ! Center Spacing 1 12"- 18" Fall Color Bloom Time & Color Early Spring Characteristics ,h Clumping foliage; beautiful purple flowers are nice color addition to planting scheme 1 Iris tenax Oregon Iris t 2 3 3 18" 12" 6"-9" Late Spring Beautiful blue and purple flowers; nice color addition to any planting scheme y • Lillium T columbianum Tiger Lily 2 5'-6' 36" 18"-28" Mid- Summer Produces one to six unscented blooms per stem; attracts butterflies R :t t." ' M • Lupinus varieties Lupine 18' 48" 24"-30' 15'-22" Summer Attacts butterflies and caterpillars; many r� Nothochelone - nemorosa <+ . Turtlehead41$* 3 up to 40" up to 40" 20 30 Summer Flowers continuously throughout the summer Ophiopogon planisCarpos Black Mondograss 3 12" 12" 6"-9" Spring/ Summer Black foliage makes this an g excellent accent when used with brightly flowering plants; maintains color Penstemon Varieties Pemstemon 3 11) 4"-24" (varies) 12"-24" (varies) 12"-18" (Varies) Summer (varies) Beautiful blue andpurpleflowers, depending onvariant,•nice color addition to planting scheme; attracts hummingbirds R... ? c" -•" Polystichum * �"� munitum ' Western Sword Fern 2 3• 36" 48" 36"-60" 30"-45" Beautiful foliage and size allows this plant to stand out in planting schemes yr 4 �lkif ',1 i 3 ,y}) %5+fY� Scientific Name _ Cornrnon Narpe k' �' '� b :.'�#Y 3^ i'[ �` e Y'N. i, iiM1 1 r Y4 d L ,y` If i k .-. L Y'-t. a '`�'yr Sedum varieties Sedum ; 1 Zone 2 �' � - `3 .,��il %v 3 Natrve .' -�.. ' 4 i'- 4U =i��l.,ilC fA' Sun Sun # .�.A; Exposure Partial 4 ` i d id•. Shade Mature Size On Center Spacing ' .. ! k�. e (varies) Fall Color yak ` F +s. L Bloom Time & Color r A .-. _,{{ ,p Spring- Summer �d'-- Characteristics pr• �d`.-�*F�' Yt '�,', I,' J'. Y- 'k 7r�3 „ y+` � M. uJ'�.1'fy' 4pj^ r, Spoon -shaped blue-green foliage, depending on variant; trailing stems; excellent asagroundcover ;Height �...^,� '�S' F (varies) ': Spread ',d' , } e -. (varies) Sidalcea varieties Checkermallows, Cherckerblooms 1 36"-48" (varies) 24"-36" (varies) 18"-28' (varies) Summer Fast-growing; manycultivarsare appropriate for biortention cells, including S. hendersonii 14. ,#' ► s ,. Smllacina racemosa Solomon's Plume .ems " 2 3 12'-36" 12"-36" 18"-28" Spring Creamy spring -time blossoms are followed by yellow -green berries that turn to red; attracts birds; fragrant flowers t s 4t 1 '. + " Soltdago canadensts e J Goldenrod 2 3 36" 24" 12'-18" Late Sum- mer * " Small bright -yellow Bowers make a live) y addition to any planting scheme; narrow lance -shaped leaves .,J Tellima randifloraFoliage ' grandiflora 2 3 12"12 6 9 1 Spring maintains a throughout the winter 1 " ! - , F jjj k • 4.t, Tiarella trifoliateDense; 1Y " S e� Western Foamflower Mk 2 3 12" 12" 6„_9„ Summer foliage maintains appearance throughout the winter . i:r. Trillium ovatum Western Trillium 2 3 18" 12" 6"-9" Spring Unique Bower to add to any planting scheme Vancouveria hexandra , Ducks Foot 2 3di 12" 12"-36" 18'-28" Spring Foliage maintains appearance throughout the winter 5 3 � Scientific Name ommon N ne Cistus salvifolius 'Prostratus' Sageleaf Rockrose Zone 2 3 3 Native Sun Sun Exposure Partial ,hr:de Mature lieplht 2' Size T Spread 6' On Center :Spacing 3'-4.5' I Fall I Colo : Bloom Time & Color Spring - Summer Characteristics Evergreen; excellent for erosion control on banks; light g ray- green leaves -'6 _. Comas sanguineo r= Bloodtwig Dogwood . t? 1 2 3 6' 6' 3'-4.5' Summer Stunning red stems in the winter months; beautiful addition to bioretention cell for winter interest t' (1 Comus sericea �_, 1 �`� Dogwood •1' i -Kira 1 2 3ES 3'-8' 3'-5' 2.5'-4' Summer Many cultivars available, including 'Flavimera'and 'Kelseyi; stunning colored stems in the winter months � !' 4� Gaultheria shallop ` rSalal h w 2 3 5' 5' 2.5'-4' Spring Fast-growing when planted shaded areas, otherwise difficult to establish 4 `' "r Holodiscus discolor . Cream Bush yr. 3 8' 15' 7.5'-12' Summer Attracts pollinators; excellent soil binder a • Mahonia aquifolium i . Oregon Grape 14 c. 2 3 6'-10' 5' 2.5'-4' Spring Attracts pollinators; blue and black berries Osmanthus burkwoodii Hybrid Sweet Olive 2 3 6'-10' 8'-1 2' 6'-9' Spring i Leathery, glossy dark -green foliage; excellent when used as a hedge; tolerant of many soils 't• .14(.4P, �,• ,� . 0! gig` p> 4 Osmanthus delavayi Sweet Olive 3 6di 5'-20' 7'-20' 10'-15' Spring p 9 , : Evergreen; dark green leaves with tubular flowers; year-round interest Scientific Name ., C ommgn Name Philadel phus iewisii Mock -Orange 1 I Zone 2 2 — 3 3 rJdtw Sun Sun Exposure Partial i i Shade Mature -Height 5'-10' Size -- Spread 5'-10' ' On Center Spacing 61144usy3 5'-7.5' Fall Color Bloom Time & Color Summer Characteristics Founstain-shaped plant; aromatic flowers * Y' p•' •, Physocarpus ca itatus p �,xr.F Pacific Ninebark 2 3 % 5'-10' 5'-10' 5'-7.5' Late Spring Dense clusters of flowers; plamts resemble spirea; rejuvenate old lantin s b cutting plantings y g to ground • '► ' • Physocarpos al ��4�..QQ opulifolius N -'h,t)'"41r�r' Common Ninebark 2 3 ti ''�• 5'-10' 3'-6' 3'-4.5' Late Spring - Dense clusters of Flowers; plamts resemble spirea; rejuvenate old plantings by cutting to ground I . z A. Pinus mugo-mugo Dwarf Mugo Pine kV 3 is 4' 5' 2.5'-4' Late Spring Low -growing; performs well, but variable in growing habit; great as an anchor plant ^'• , V( Rhododendron w�;; 1 J �r varieties - Rhododendron 2 3 10' (varies) 10' (varies) S'-7.5' (varies) Spring- Summer (varies) Many cultivarsthat vary in bloomtime, size, and color, leathery leafed with stunning flowers ;' Ribes eying Cneum Red -Flowering Currant 2 3 di5'-12' 10' 5'-7.5' Spring Produces drooping clusters of Flowers l'. » Rosa gymnocarpa=r !, r BaldhipRoseill 2 3 jb 5' 1'-2' 1'-1.5' 1 Sri ng- Summer Fast-growing to 3'; slender; small rose with delicate stems and flowers; stems are bristled Rosa pisocarpa1 Swamp Rose" FA. 2 3 1r 10' 3'-6' 3'-4.5' Spring - Fall Unique among roses given is preference forwet, almost swampy conditions; stems have thorns 7 Scientific Name Common NJ me Zone Sun Exposure j Mature Size On — Native j — — f Center 2 3 Sun Partial Shnde I Height Spread Spacing Fall Bloom Color Time & Color Characteristics Rosa nutkana Nootka Rose Rubus spectabilis Salmonberry Salix purpurea Purple Osier Sambucus nigra Elderberry Symphoricarpos albus Snowberry Thuja plicata 'Whipcord' Dwarf Red Cedar Vaccinium parvifolium Red Huckleberry 8 Spring Winter - Spring Late Spring Spring Spring Arching stems with gray -green leaves Fast-growing; excellent soil binder Dark green leaves with blue under- side; striking purple branches; cut to ground if overgrown Dramatic accent plant fragrant white flowers Pink spring -time flowers are followed by white berries that last through the winter; great for erosion control Unusual and unique planting; cascading branches form a nice mound; bronze winter color Thin branches with cascading habit create a beautfil silhouette Scientific NameFall Common Name AO' ELv. M �!'+h ° a.},?�?.e vML tFyYa�k,, t. , . Acer circinatum 1 '. r` `+ . Vine Maple 1 on• 2 2 — 3 3 Native un Sun - xp•sire Partial Shad a u Height 30' e ze --I Spread 30' pi„, Smp Width +iY .ixs' } 5' �), Cc.ntor p 7 yTIXTn"'�''C3 15' Color tr: v`j .,•.' lT WO : oom Trme & Color �..§&°. �"' : yr. a Spring Characteristics + £a -., ° f Small, nearly symmetrical tree; multiple trunks Alnus rubra " r Red Alder i.... 1 2 3 di 45'-50' 20'-30' 6' 15' Attractive light gray bark; dark green leaves with rust -colored underside; most common alder of the Pacific Northwest Betula papyfera Paper Birch 2 3 50'-60' 25' 6' 12.5' Attractive, creamy -white bark y Cornus varieties + M- .1 Cherry Tree 3 a 20' (varies) 20' (varies) 5' 10' (varies) Spring E- Highly adapatable to environment; many appropriate cultivarsavailable '!! Cory! us eornuta Beaked Hazlenut 2 3 20' 10' S' 5' Vase -like shape; needs adequate space to grow; catkins add winter interest d. .� '• Crataegus x l avahi -s c Lavalle Hawthorne ,r 3 25' 20' 5' 10' Spring Dark green leathery leaves; clusters fof red fruits add winter color Fraxinuslatifolia Oregon Ash 1 2 60' 35' 6' 18' Tolerant of wet conditions P ?. t .110. Lonicera involucrata Y r' . �ua • Y 4 -r -7'Y• BlackTwinberry 1 2 9' 10' 5' Summer -. Attractive to hummingbirds 9 Scientific Name t ornmon Nel7lc' LARGE SHRUBS AND TREES Malus1 Pacific Crabapple In --- 1 Zone --_ 2 i'--'— 3 Native Sun ---- ----- Sun F=, Exposure Part. I r;iir -------- Sh ie Mature — Height 10'-30' Size -- `)bread 10'-30' r rant strir. Width Or, Center our P• xr Mat., 'Spread 15' Fall COIOr Bloom Time& Color Spring Characteristics Requires adequate room to grow; fragrant apple blossoms of white or pink; bears fruit ,'' Myrica californica Pacific Wax Myrtle 1 2 s3� i 15' 15' 5' 7.5' Spring Many upright trunks; branches are densely covered in foliage; purple nutlets attract birds; useful in screening _ Parrotla persiCa PersianParrotia 2 3 EA 15'-30' 20' 5' 10' Early Spring Smooth gray bark with white patches; colorful tree year- round n. Rhamnuspurshiana / ' Cascara I 2Wil 3 20'-40' 10'-30' 5' 15' Smooth gray bark; picturesque branches; dark green leaves , ": " `• . - Salix I ucida Pacific Willow 2 it 15'-45' 30' 15' Spring Useful as a screening plant or windbreaker; aggressive roots are excellent for stablizing banks Salix sitchensis Sitka Willow 1 2 25'15' 7.5' Spring Multi -stemmed; gray -brown bark; useful in screening '''''::-(I 1. SambucusCaerulea o ti L {NA)I Blue Elderberry w{�i, i,t . , 2 3 fa 10'-30' 8'-20' 10' Spring Clusters of summertime blue or black berries follow spring- time flowers 1/4 Thujaplicata , Western Red Cedar • ( 2 3Ali 50'- 100' 25'-60' 12' 30' Many cultivars; slender, drooping branches with dark green leaves; requires adequate space to grow City of Tukwila City Council Utilities Committee UTILITIES COMMITTEE Meeting Minutes September 27, 2016 - 5:30 p.m. - Foster Conference Room, 6300 Building Councilmembers: Kathy Hougardy, Chair; Kate Kruller, Thomas McLeod Staff: Bob Giberson, Robin Tischmak, Ryan Larson, Pat Brodin, Greg Villanueva, Gail Labanara, and Laurel Humphrey CALL TO ORDER: Committee Chair Hougardy called the meeting to order at 5:30 p.m. I. PRESENTATIONS II. BUSINESS AGENDA A. Supplemental Agreement: Crystal Springs Emergency Surface Water Repair Staff is seeking Council approval of Supplemental Agreement No. 1 to Contract No. 16-104 in the amount of $39,905.11 with KPG, Inc. for construction management services for the Crystal Springs Emergency Surface Water Repair project. KPG was selected from three firms due to experience with the City and the project design. Funds will come from the 2016 Annual Small Drainage Program. UNANIMOUS APPROVAL. FORWARD TO OCTOBER 1, 2016 REGULAR CONSENT AGENDA. B. Amendments to Tukwila Municipal Code Title 16, Grading The City's current National Pollutant Discharge Elimination System (NPDES) permit requires the City make Low Impact Development (LID) techniques the preferred and common approach to development and redevelopment. Significant amendments are proposed to Title 16, Grading, of the Tukwila Municipal Code to be consistent with the changes made by the Department of Ecology's requirements . Changes are proposed in the areas of permit applications, erosion and sediment control, standards, inspections and hazard damage. Because the November 15, 2016 meeting will likely be cancelled, the Committee agreed that the draft ordinance including the amendments can go directly to the Committee of the Whole. UNANIMOUS APPROVAL. FORWARD TO NOVEMBER 28, 2016 COMMITTEE OF THE WHOLE. Utilities Committee Minutes September 13, 2016 III. MISCELLANEOUS Staff asked for Committee approval to forward the three ordinances relating to the NPDES permit (amending TMC Titles 14,16, and 18) to the November 28, 2016 Committee of the Whole as they are all related and can then move through Council review as a package. The Committee agreed, and Councilmember Kruller requested this be confirmed via formal motion. Motion was made by Councilmember Kruller and seconded by Councilmember McLeod to send all three ordinances to the November 28, 2016 Committee of the Whole. The ordinance relating to the Zoning Code, Title 18, is scheduled for the Planning Commission on October 27, 2016. Meeting adjourned at 5:56 p.m. Next meeting: Tuesday, October 11, 2016 FL Committee Chair Approval Minutes by LH, Reviewed by GL Moira Bradshaw From: COM GMU Review Team <reviewteam@commerce.wa.gov> Sent: Monday, September 26, 2016 8:56 AM To: Moira Bradshaw Cc: Andersen, Dave (COM) Subject: 22834, City of Tukwila, Expedited Review Granted, DevRegs Dear Ms. Carr Bradshaw: The City of Tukwila has been granted expedited review for the: Proposed amendments to the City's development regulations (Tukwila Municipal Code 14, 16 and 18) are to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution -generating activities. The changes are intended to: 1. Provide better protection of environmental resources and private property, and 2. Meet the intent of requirements of the GMA, the Clean Water Act and Tukwila's Municipal Stormwater permit. The proposed changes adopt King County's new Surface Water Design Manual and incorporate low impact development standards throughout the City's development regulations. This proposal was submitted for the required state agency review under RCW 36.70A.106. As of receipt of this email, the City of Tukwila has met the Growth Management Act notice to state agency requirements in RCW 36.70A.106 for this submittal. For the purpose of documentation, please keep this email as confirmation. If you have any questions, please contact reviewteam@commerce.wa.gov Thank you. Review Team, Growth Management Services Department of Commerce P.O. Box 42525 Olympia WA 98504-2525 1 �./ STATE OF WASFw:GTO; DEPARTMENT OF COMMERCE 1011 P!um Sueet SE • PO Box 42525 • O yrnpia, Washinion 98504-2525 • (360) 725-4000 ttr, -4l.commerce.:ta.0 v September 21, 2016 Moira Carr Bradshaw Senior Planner City of Tukwila 6200 Southcenter Boulevard Tukwila , Washington 98188 Dear Ms. Carr Bradshaw: Thank you for sending the Washington State Department of Commerce (Commerce) the following materials as required under RCW 36.70A.106. Please keep this letter as documentation that you have met this procedural requirement. City of Tukwila - Proposed amendments to the development regulations Municipal Code 14, 16 and 18 are to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution -generating activities. The changes are intended to: 1. Provide better protection of environmental resources and private property, and 2. Meet the intent of requirements of the GMA, the Clean Water Act and Tukwila's Municipal Stormwater permit. The proposed changes adopt King County's new Surface Water Design Manual and incorporate low impact development standards throughout the City's development regulations. These materials were received on September 21, 2016 and processed with the material ID # 22862. Expedited Revie is requested under RCW 36.70A.106(3)(b). If this submitted material is an ad p e6 ame dment, then please keep this letter as documentation that you have met the procedural requirement under RCW 36.70A.106. If you have submitted this material as a draft amendment requesting expedited review, then we have forwarded a copy of this notice to other state agencies for expedited review and comment. If one or more state agencies indicate that they will be commenting, then Commerce may deny expedited review and the standard 60-day review period will end on November 20, 2016. Commerce will notify you by e-mail regarding of approval or denial of your expedited review request. If approved for expedited review, then final adoption may occur no earlier than October 05, 2016. Please remember to submit the final adopted amendment to Commerce within ten (10) days of adoption. If you have any questions, please contact Growth Management Services at reviewteam@commerce.wa.gov, or call Dave Andersen (509) 434-4491. Sincerely, Review Team Growth Management Services Ohl of gam& Department Of Community Development AFFIDAVIT OF DISTRIBUTION I, 11 101Y HEREBY DECLARE THAT: Notice of Application Notice of Decision Notice of Public Hearing Notice of Public Meeting )c Determination of Non- Significance Mitigated Determination of Non - Significance Determination of Significance & Scoping Notice Short Subdivision Agenda Notice of Application for Shoreline Mgmt Permit Shoreline Mgmt Permit Board of Appeals Agenda Packet Board of Adjustment Agenda Packet Official Notice Notice of Action Other: Was mailed to each of the addresses listed/attached on this day of Project Name: 1.51he'� Project Number: giv.0 3 Associated File Number (s): L`/ f©O5 U Mailing requested by: Mailer's si nature: W:\PLANNING\DEVELOPMENT REVIEW MANUAL\2. LAND USE APPLICATIONS REVIEW PROCESS'5,. PUBLIC NOTICE PROCEDURES\MAILING\AFFIDAVIT OF DISTRIBUTION.DOC Moira Bradshaw From: Moira Bradshaw Sent: Monday, September 19, 2016 2:11 PM To: Moira Bradshaw Cc: Greg Villanueva Subject: Determination of Non -Significance - Low Impact Development procedures for Surface Water Attachments: DNS.pdf; E16-0008 Staff Report.doc Dear interested parties: Attached is the SEPA Determination of Nonsignificance for City of Tukwila File: E16-0008 that relates to an updated Surface Water Design Manual and other Tukwila Municipal Code changes that emphasize low impact development standards for the design of development projects. The issue will be moving through a public review process with the Planning Commission and City Council. Please contact me or Greg Villanueva if you have any questions. http://www.tukwilawa.gov/proposed-new-standards- drainage-review-design-development-projects/ Kind regards, Moira Carr Bradshaw Senior Planner Community Development Department 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 (206) 4313651 1 Moira Bradshaw From: Moira Bradshaw Sent: Monday, September 19, 2016 3:27 PM To: 'sepaunit@ecy.wa.gov' Cc: Greg Villanueva Subject: DNS SEPA File E16-0008 Attachments: SEPA Application and checklist for LID.pdf; DNS.pdf; E16-0008 Staff Report.doc; Amended IDCS Draft FINAL.pdf; Amended Tukwila Development Code Draft FINAL.pdf; Draft 2016 KCSWDM Ord 2.doc; New Tukwila Bioretention Plant List Draft FINAL.pdf; New Tukwila Street Tree List Draft FINAL.pdf; Affidavit of Distribution for NOA.pdf Please contact me if you have any questions. Moira Carr Bradshaw Senior Planner Community Development Department 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 (206) 4313651 1 City of Tukwila City Council Utilities Committee UTILITIES COMMITTEE Meeting Minutes September 13, 2016 - 5:30 p.m. - Foster Conference Room, 6300 Building Councilmembers: Kathy Hougardy, Chair; Kate Kruller, Thomas McLeod Staff: Bob Giberson, Robin Tischmak, Mike Cusick, Ryan Larson, Minnie Dhaliwal, Pat Brodin, Peter Lau, Gail Labanara, Laurel Humphrey CALL TO ORDER: Committee Chair Hougardy called the meeting to order at 5:30 p.m. I. PRESENTATIONS II. BUSINESS AGENDA A. Bid Award: Crystal Springs Emergency Surface Water Repair Staff is seeking Council approval to award a contract to Hoffmann Construction Inc. in the amount of $203,361.00 for the Crystal Springs Emergency Surface Water Repair. Hoffman was the lowest bidder of nine bids received, and is under the Engineer's Estimate of $251,605. This project will construct a permanent repair of the surface water pipe at Crystal Springs Park, which was declared an emergency in July. Funds for the contract will come from the 2016 Annual Small Drainage Program. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. B. Amendments to Tukwila Municipal Code Chapter 14.30, Surface Water Management The City's current National Pollutant Discharge Elimination System (NPDES) permit requires the City to adopt either the 2012 Department of Ecology Surface Water Design Manual or an equivalent by December 31, 2016. The intent is to make Low Impact Development (LID) techniques the preferred and common approach to development and redevelopment. Following analysis, staff proposes adopting the 2016 King County Surface Water Design Manual (KCSWDM) and 2016 King County Stormwater Pollution Prevention Manual. Amendments are proposed to Chapter 14.30, Surface Water Management, of the Tukwila Municipal Code to adopt these manuals as well as add a section on waste receptacle requirements and catch basin labeling. The proposed amendments must be reviewed by the Department of Commerce and then will return for Council review and adoption. COMMITTEE DISCUSSION ONLY. Utilities Committee Minutes. September13, 2016 C. Amendments to Tukwila Municipal Code Title 18 - Zoning Staff is seeking Committee approval to forward proposed amendments to Tukwila Municipal Code Title 18, Zoning, to the Planning Commission to make recommendations back to the Utilities Committee later this year. The City's NPDES Phase II permit requires the City to review, revise and make effective local development codes and standards to incorporate LID principles and best practices by December 31, 2016. Amendments have been prepared including cross - departmental review as well as feedback from the City's consultant on this project, Otak. COMMITTEE APPROVAL TO FORWARD TO THE PLANNING COMMISSION. D. Supplemental Agreement: Andover Park East Water & Sewer Replacement Staff is seeking Council approval of Supplemental Agreement No. 1 to Contract No. 15-116 with PACE Engineers, Inc. in the amount of $55,096.32 for the Andover Park East Water and Sewer Replacement Project. The supplement will provide for additional design, on -call construction management, and extends the contract to December 31, 2017. The supplemented contract is within the remaining construction management budget of $107,106.16. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 26, 2016 COMMITTEE OF THE WHOLE. E. Project Completion: Emergency Sewer Repair at 1200 Andover Park East Staff is seeking Council approval of project completion and release of retainage to the R.L. Alia Company in the amount of $168,669.76 for the CBD Sanitary Sewer Rehabilitation - Emergency Sewer Repair at 1200 Andover Park East. This project provided roadway excavation and sewer pipe replacement in an area of severe deterioration and was completed on May 11, 2016. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. F. Project Completion: Sewer Repair at 1227 Andover Park East Staff is seeking Council approval of project completion and release of retainage to the R.L. Alia Company in the amount of $109,213.68 for the CBD Sanitary Sewer Rehabilitation - Sewer Repair at 1227 Andover Park East. This project provided sewer pipe replacement in an area of severe deterioration and was completed on May 11, 2016. UNANIMOUS APPROVAL. FORWARD TO SEPTEMBER 19, 2016 REGULAR CONSENT AGENDA. III. MISCELLANEOUS Councilmember Kruller raised a concern about a dangerous intersection at South 137th St and 34th Avenue South impacting children walking to school at Cascade View Elementary. In addition, there was a recent hit and run property damage accident at South 135th St and 34th Avenue South. Further discussion on these intersections will take place in Transportation Committee. Meeting adjourned at 6:03 p.m. Next meeting: Tuesday, September 27, 2016 Committee Chair Approval Minutes by LH, Reviewed by GL City of Lkwila Utilities Committee •�• •�• •�• Kathy Hougardy, Chair Kate Kruller Thomas McLeod AGENDA "ribution: 1._.,,iougardy K. Kruller T. McLeod J.Duffie D. Robertson Mayor Ekberg D. Cline L. Humphrey B. Giberson R. Tischmak G. Labanara P. Brodin R. Turpin Deputy City Clerk Clerk File Copy 2 Extra e-mail cover to: A. Le, C. O'Flaherty, K. Hougardy, D. Almberg, B. Saxton, S. Norris, L. Humphrey TUESDAY, SEPTEMBER 13, 2016 — 5:30 PM FOSTER CONFERENCE ROOM - 6300 Building Item Recommended Action Page 1. PRESENTATION(S) 2. BUSINESS AGENDA a) Crystal Springs Emergency Surface Water Repair a) Forward to 9/19/16 Regular Pg. 1 Bid Award Consent Agenda b) NPDES — Review Surface Water Management LID b) Information Only Pg. 5 Code Amendments, TMC Title 14 c) NPDES — Review Surface Water Low Impact Development Code Update, TMC Title 18 Zoning c) Committee Approval to forward to Planning Commission Pg. 23 d) Andover Park East Water & Sewer Replacement d) Forward to 9/26/16 C.O.W. and Pg. 37 PACE Engineers Supplemental Agreement No. 1 10/3/16 Regular e) CBD Sanitary Sewer Rehabilitation e) Forward to 9/19/16 Regular Pg. 43 Emergency Sewer Repair at 1200 Andover Park E Consent Agenda Project Completion and Acceptance f) CBD Sanitary Sewer Rehabilitation f) Forward to 9/19/16 Regular Pg. 47 Sewer Repair at 1227 Andover Park East Consent Agenda Project Completion and Acceptance 3. ANNOUNCEMENTS 4. MISCELLANEOUS Future Agendas: Next Scheduled Meeting: Tuesday, September 27, 2016 The City of Tukwila strives to accommodate individuals with disabilities. Please contact the Public Works Department at 206-433-0179 for assistance. f City of Tukwila i •\ Allan Ekberg, Mayor INFORMATIONAL MEMORANDUM TO: Utilities Committee FROM: Bob Giberson, Public Works Director-fA BY: Greg Villanueva, NPDES Coordinator CC: Mayor Ekberg DATE: September 9, 2016 SUBJECT: National Pollutant Discharge Elimination System (NPDES) Project NO. 99341210 Surface Water Management LID Code Amendments — TMC Title 14 ISSUE Review new Surface Water Management Ordinance per National Pollutant Discharge Elimination System (NPDES) permit requirements. BACKGROUND The City operates the surface water system under a general NPDES permit issued by the Department` of Ecology (DOE). The NPDES permit allows the City to discharge surface water to Waters of the State provided we meet the NPDES permit requirements. The City's current IVPDES permit requires that the City adopt either the 2012 DOE Surface Water Design Manual or an equivalent surface water manual, such as the 2016 King County Surface Water Design Manual (KCSWDM), by December 31, 2016. ANALYSIS The intent of the required storm water manual update is to make Low Impact Development (LID) techniques the preferred and commonly -used approach to site development and or re -development. LID refers to systems and practices that use or mimic natural processes that result in the infiltration, evapotranspiration, or storage on site using soil or vegetation. Staff reviewed the 2016 KCSWDM and determined that it is the City's best option to meet the NPDES permit requirements. In order to be considered equivalent to the DOE manual, the City must also adopt the 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) and ensure that other development codes are equivalent to King County codes referenced in the KCSWDM. Both manuals are adopted through a City Ordinance process. The proposed substantive changes to the Surface Water Management Ordinance are: • Adopt the 2016 KCSWDM in place of the 2009 KCSWDM (design manual) • Adopt the 2016 KCSPPM in place of the 2009 KCSPPM (prevention manual) • Add a section on trash and waste receptacle requirements • Add catch basin labeling The proposed code revisions will first be sent to the Dept. of Commerce for review prior to Ordinance adoption. FINANCIAL IMPACT No financial impact. RECOMMENDATION For information only. Attachments: Draft Code Revisions in Strikethreugh and Underline Form LID Milestones and Schedule W:\PW Eng\PROJECTS\A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\0tak LID Gap Malysis\Into Memo 2016 UC KC SWDM RDL.doc CHAPTER 14.30 SURFACE WATER MANAGEMENT Sections: 14.30.010 Authority 14.30.020 Purpose 14.30.030 Definitions 14.30.040 Applicability 14.30.050 Compliance 14.30.060 Standards 14.30.070 Permits 14.30.080 Stormwater Drainage System Maintenance and Inspection Requirements 14.30.090 Special Drainage Fee 14.30.100 Inlet Marking 14.30.110 Financial Guarantees 14.30.120 Insurance 14.30.130 Exceptions 14.30.140 Liability 14.30.150 Penalties 14.30.160 Abatement 14.30.170 Injunctive Relief 14.30.180 Appeals 14.30.010 Authority. A. The Public Works Director shall administer TMC Chapter 14.30. The Director's authority includes the establishment and publication of regulations and procedures to supplement and implement this Chapter, approval of permits and exceptions, and enforcement and implementation of measures necessary to carry out the intent of TMC Chapter 14.30. Such regulations and procedures shall be incorporated within Chapter 5 of the Public Works Infrastructure and Design and Construction Standards, as amended, revised or re -adopted from time to time and hereinafter known and referred to as the Public Works Surface Water Regulations and Procedures. B. The Public Works Director may initiate all required actions to prevent or stop acts or intended acts of an applicant or other person that constitute a hazard to life or safety; endangered property; or adversely affect the safety, use or stability of a public way, surface water, a conveyance system or a sensitive area or buffer. C. If the Director determines that a person engaged in an activity that could or does negatively affect surface water has failed to comply with City code or with approved surface water plans and/or other permit conditions, the Director may implement any or all of the following enforcement actions: 1. Suspend or revoke without written notice any surface water permit issued by the City, when the Director determines an immediate danger to life, safety or property exists in a downstream area or adjacent property. 2. Serve a written notice of violation upon that person by registered or certified mail or personal service. The notice shall set forth the measures necessary to achieve compliance, specify the time to commence and complete corrections and indicate the consequences for failure to correct the violation. 3. Suspend or revoke any surface water permit issued by the City after written notice is given to the applicant for any of the following reasons: W:\PW Eng1PROJECTSIA- DR ProiectsltiPDES Program (9934121011201 S 2017 Capacity GrantV )tak LID Gap Analvsist2016 KCSWDM Onlinancc\Drefr 2016 KCSWDM Codified RT Tracked.doc 6 a. Any violation(s) of the conditions of the surface water permit; b. Changes in site runoff characteristics upon which a permit or exception was granted; c. Construction not in accordance with the approved plans; or d. Non-compliance with correction notice(s) or "stop work" order(s) issued for the construction of temporary or permanent stormwater management facilities. 4. Post a "stop work" order at the site directing that all activities that could affect surface water or a conveyance system cease immediately. The "stop work" order may include any discretionary conditions and standards adopted in TMC 1430.070 that must be fulfilled before any work may continue. 14.30.020 Purpose. The provisions of TMC Chapter 14.30 shall be liberally construed to accomplish the following purposes: 1. Promote sound development policies and procedures that protect and preserve the City's water courses, groundwater and surface water infrastructure; 2. Protect surface water conveyance systems and receiving waters from pollution, mechanical damage, excessive flows and other conditions that increase erosion and/or turbidity, siltation and other pollution, or that will reduce groundwater recharge or endanger aquatic and benthic life within surface waters and receiving waters within the State; 3. Meet the requirements of State and federal law; 4. Fulfill the City's responsibilities as trustee of the environment for future generations; 5. Promote the health, safety and welfare of the public; 6. Protect private and public property from drainage -related damage; 7. Promote site planning and construction practices that are consistent with natural topographical, vegetative and hydrological conditions; and 8. Preserve and enhance the suitability of water bodies for recreation and wildlife habitat. 14.30.030 Definitions. Unless specifically defined below, words or phrases used in TMC Chapter 14.30 shall be interpreted using the meaning they have in common usage and to give TMC Chapter 14.30 its most reasonable application; provided that words or phrases not defined herein that are defined in the City of Tukwila Surface Water Design Manual or Stormwater Pollution Prevention Manual, shall have the meaning given therein. 1. "Applicant" means any person, governmental agency or other entity that executes the necessary forms to procure official approval of a project or a permit to carry out construction of a project. Applicant also means any person, governmental agency or other entity that is performing or plans to perform permitted work within the City. 2. "Approval" means proposed work or completed work conforming to TMC Chapter 14.30 as approved by the Director. 3. "Best Management Practice" means those practices which provide the best available and reasonable physical, structural, managerial or behavioral activity to reduce or eliminate pollutant loads and/or concentrations leaving a site. W:WW EnpWROJECTSIM DR Proiectsil4PDES Program (9934121011201C 2017 Capacity GratnlOtak LTG Gap Analysis12016 KCSWDM Onlinance\Draft 2016 KCSWDM Codified RT Tracked.doc GV:ksnJJ2414^/HAIcnnnnI4111.1nr114n14ln14nn»ni4n11 f11Confnnlcv"Onn+.gf{y__gly Page 2 of 15 7 4. "City" means the City of Tukwila or the City Council of Tukwila. 5. "Comprehensive Surface Water Management Plan" means a plan adopted by the City Council to guide the physical growth and improvement of the City and urban growth management area, including any future amendments and revisions. 6. "Conveyance system" means natural and man-made drainage features that collect, convey, channel, hold, inhibit, retain, detain, infiltrate, divert, treat or filter surface water. Natural drainage features include swales, streams, rivers, lakes and wetlands. Man-made features include gutters, ditches, pipes and detention/retention facilities. 7. "Critical drainage area" means an area, as determined by the City, needing additional controls to address flooding, drainage, and/or erosion conditions that pose an imminent likelihood of harm to the welfare and safety of the surrounding community. 8. 'Development" means any man-made change of improved or unimproved real estate; the construction, reconstruction, conversion, structural alteration, relocation or enlargement of any structure; any mining, excavation, landfill, clearing or land disturbance; or any use or extension of the use of land. 9. "Director" means the Director of Public Works or his or her designee. 10. "Drainage review" means an evaluation by the City to determine compliance with the City's standards and adopted Surface Water Management Manual. 11. "Erosion" means detachment and transport of soil or rock fragments by water, wind, ice, etc. 12. "Illicit discharge" means all non -surface water discharges to surface water conveyance systems that cause or contribute to a violation of State water quality, sediment quality or ground water quality standards. These discharges include sanitary sewer connections, industrial process water, interior floor drains, car washing and grey water systems. 13. "Low impact development *(LID)" means use of innovative or creative reduced or zero drainage discharge from the site after development means a :stormwater and land use ;management strategv that strives to mimic pre -disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. 14. "Plans" means the plans, profiles, cross sections, elevations, details and supplementary specifications, showing the location, character, dimensions and details of the work to be performed. These plans are approved by the Public Works Director and are usually signed by a registered professional engineer licensed in the State of Washington. 15. "Pollutant" means anything which causes or contributes to pollution. Pollutants may include, but are not limited to: paints, varnishes and solvents; oil and other automotive fluids; non -hazardous liquid, solid waste and yard waste; refuse, rubbish, garbage, litter or other discarded or abandoned objects, ordnance and accumulations, so that same may cause or contribute to pollution; floatables; pesticides, herbicides and fertilizers; hazardous substances and wastes; sewage, fecal coliform and pathogens; dissolved and particulate metals; animal waste; waste and residue that W:1PW Ene\PROJECTS\A- DR Proiects\NPDES Program (99341210I4015 2017 Capacity Gram\Otak LID Ciao Analvsis\20I6 KCSW[)M Qrdinance\D aft 2016 KCSWDM Codified RT Trxkedeloc GV:ksn 9nnol' Page 3 of 15 8 results from constructing a building or structure; and noxious or offensive matter of any kind. 16. "Pollution" means contamination or other alteration of the physical, chemical, or biological properties of waters of the State that will or is likely to create a nuisance or render waters harmful, detrimental or injurious 1) to public health, safety or welfare, or 2) to domestic, commercial, industrial, agricultural, recreational or other legitimate beneficial uses, or 3) to livestock, wild animals, birds, fish or other aquatic life. Contamination includes discharge of any liquid, gas or solid radioactive or other substance. Alteration includes temperature, taste, color, turbidity or odor. 17. "Project" means activity encompassing all phases of the work to be performed and is synonymous to the term "improvement" or "work." 18. "Runoff" means water originating from rainfall and other precipitation that is found in drainage facilities, rivers, streams, springs, seeps, ponds, lakes and wetlands, as well as shallow groundwater and that portion of precipitation that becomes surface flow and interflow. 19. "Sediment" means fragmented material originating from weathering and erosion of rocks or unconsolidated deposits, which is transported by, suspended in or deposited by water. 20. "Sedimentation" means the deposition or formation of sediment. 21. "Single-family residence" means a project that constructs or modifies one single family dwelling unit and/or makes related on -site improvements, such as a driveway, outbuildings or play courts. 22. "Surface water plan" means a set of drawings and documents submitted as prerequisite to obtaining a development permit. 23. "Stormwater" means surface water. 24. "Stormwater drainage system" means conveyance system. 25. "Surface flow" means flow that travels overland in a dispersed manner (sheet flow) or in natural channels or streams or constructed conveyance system. 26. "Surface Water" means that portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow channels or pipes into a natural drainage system, a surface water conveyance system or into a constructed surface water facility. 27. "TMC" means the Tukwila Municipal Code. 28. "Typical" means the guidelines that shall be followed unless the Director approves an exception. 29. "Water body" means a creek, stream, pond, wetland, lake or river. 30. "Watershed" means a geographic region within which water drains into a particular river, stream or water body as identified and numbered by the State of Washington Water Resource Inventory Areas (WRIAs) as defined in the Washington Administrative Code. 14.30.040 Applicability. TMC Chapter 14.30 applies to all development activities occurring within the City limits that could affect surface water. 14.30.050 Compliance. A. TMC Chapter 14.30 contains minimum requirements. The requirements do not replace, repeal, abrogate, supersede or affect any other more stringent requirements, W:\PW Ene\PROJECTSW- DR Projects\NPDES Program (99341210)12015 2017 Carmen), Grant\Otak LID Gan Anainsis\2016 KCSWD 4 Ordinance\ Draft 2016 KCSWDM Codified RTTracked doe 9 rules, regulations, covenants, standards or restrictions. Where TMC Chapter 14.30 imposes requirements that provide more protection to human health or the environment, the requirements of TMC Chapter 14.30 shall prevail. B. Approvals and permits granted under TMC Chapter 14.30 do not imply waiver of other laws and regulations, nor do they indicate compliance with other laws and regulations. C. Compliance with the minimum standards and requirements set forth in TMC Chapter 14.30 and related regulations, standards and manuals adopted by the City does not necessarily mitigate all impacts to human health and the environment. In such cases, the applicant must implement additional mitigation to protect human health and the environment. D. City departments shall comply with all the requirements of TMC Chapter 14.30, with the exception of obtaining permit and approvals from the City for works performed in the public rights -of -way, or for operation and maintenance activities by the Department of Parks and Recreation. E. Unless otherwise required by law, in the event of a conflict or inconsistency between a standard or requirement of this chapter and a standard or requirement of the Public Works Surface Water Regulations and Procedures, the SWDM, the DOE SWDM or the SPPM, this chapter shall control to the extent of the conflict or inconsistency; provided that, if a requirement or standard of the Public Works Surface Water Regulations and Procedures, SWDM, DOE SWDM or SPPM, is more restrictive, i.e., provides more protection to human health or the environment, then the more restrictive requirement or standard shall control. For example, if a particular core requirement exemption allowed under the SWDM is not allowed pursuant to the Public Works Surface Water Regulations and Procedures, the more restrictive standard of the Public Works Surface Water Regulations and Procedures will apply. 14.30.060 Standards. All development activities within the City shall be undertaken in accordance with the following minimum standards, except that depending on a project's possible impact to public and environmental health and safety, the Director may require stricter standards: 1. The City's National Pollutant Discharge Elimination System (NPDES) permit. 2. The 2009 2016 King County Surface Water Design Manual (hereafter known and referred to as "KCSWDM"), attached hereto as "Exhibit A" (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Surface Water Design Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Surface Water Design Manual or the SWDM. The Director will review subsequent amendments to the KCSWDM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 3. The Department of Ecology 2005 2012 Stormwater Management Manual for Western Washington, hereafter known and referred to as the "DOE SWDM," may be used for project design for multi -jurisdictional development projects wherein a substantial and material portion of the development project will take place outside of the jurisdictional boundaries of the City and will be required by a permitting authority to comply with the standards set forth in the DOE SWDM; provided that the Public Works Director approves of the DOE SWDM based upon a finding that application of differing standards set forth in the SWDM and the DOE SWDM will create a hardship for the applicant, and that approval of use of the DOE SWDM will not result in requirements that are less restrictive than the SWDM or otherwise inconsistent with the purpose of this chapter. W:WW Ena\PROJECTS\A- DR Projects \ NPDES_Plog[an1991412101\2015 2017 Capacity GranitOtak UP Gap Analysisl2016 KCSWDM Ordinance' Draft 2016 KCSWDM Codified RT Tracked.doc A...tl/AfTlf l'..Ln n nt!•I`Tel A 1111 2,1....11l Mlt'C GV:ksn 9f1201 ...... 111111 l Illtltt'tltt v.r•'.1... lfll<vr'cun„; Page 5 of 15 10 4. The 2009 2016 King County Stormwater Pollution Prevention Manual, hereafter known and referred to as "KCSPPM," attached hereto as Exhibit B (or in alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Stormwater Pollution Prevention Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Stormwater Pollution Prevention Manual or the "SPPM." The Director will review subsequent amendments to the KCSPPM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 5. The Public Works Surface Water Regulations and Procedures. 6. Development design and construction shall meet all of the applicable standards and codes, recommendations in specific reports, such as the geo-technical report and the Technical Information Report, and design criteria contained in the Comprehensive Surface Water Management Plan or Drainage Basin Plans. 7. Unless the context indicates otherwise, the following terms and phrases, as used in the SWDM or the SPPM, shall have the meaning or reference given. Table 14.1 Tukwila Terminology Equivalents to King County Terminology King County Term City of Tukwila Term Agricultural Project Term does not apply. Critical Drainage Area Critical Drainage Area means an area as determined by the City needing additional controls to address flooding, drainage and/or erosion condition that poses an imminent likelihood of harm to the welfare and safety of the surrounding community. DDES1 City of Tukwila Department of Community Development. DNRP1 City of Tukwila Department of Community Development. Director City of Tukwila Public Works Director. King County City of Tukwila. King County Road Standards City of Tukwila Infrastructure Design and Construction Standards and the requirements of the City of Tukwila Transper-tation Public Works Department and Surface Water and Land Resource Division City of Tukwila Public Works. Zoning Classifications: Agriculture (A); Forest (F); Rural (Z) These zoning classifications are intended for areas outside the Urban Growth Boundary; therefore the City of Tukwila contains no equivalent zoning. Refer to City of Tukwila zoning maps and designations. 1Other terms used in the KCSWDM to reference other King County staff or departments shall also refer to the City of Tukwila Department of Community Development. 8. All references in the SWDM or the SPPM to the following King County codes, or any section thereof, shall be replaced by reference as indicated in Table 14.2 to the applicable code and comparable section thereof. Table 14.2 Tukwila Municipal Code Equivalent to King County Code1 King County Code de C Description Tukwila Code (TMuniciM Description W:\PW ling \PROJECTS41- DR Proiects\NPDES Program (99341210)t01 S 2017 Capacity Grantl()tak LID Gap Analvsis\2016 KCSWDM. Shdinancc\Draft 2016 KCSWDM Codified RT Tracked.docW:'^ W 11 KCC 2.98 Critical Drainage Areas TMC 14.30 WATER AND SEWER - Stormwater Management KCC 16.82 BUILDING AND CONSTRUCTION STANDARDS - Clearing and Grading TMC 16.54 BUILDING AND CONSTRUCTION - Grading KCC 21A.14 Development Standards Design Requirements TMC 14.30 WATER AND SEWER - Stormwater Management KCC 21A.24 Critical Areas TMC 18.45 ZONING - Environmentally Sensitive Areas KCC 21A.06 Technical Terms and Land Use Definitions TMC 18.08 ZONING - Districts Established - Map KCC 20.14 Basin Plans TMC 14.30 WATER AND SEWER - Stormwater Management ZONING - Shoreline Overlay District KCC 25 Shoreline Management TMC 18.44 KCC 9 KCC 9.02 KCC 9.04 KCC 9.08 KCC 9.12 KCC 9.14 Surface Water Management General Provisions Surface Water Runoff Policy Surface Water Management Program Water Quality Groundwater Protection TMC 14.30 TMC 18.45 WATER AND SEWER - Stormwater Management ZONING - Environmentally Sensitive Areas 1This table identifies the main City municipal code chapters that contain information/requirements for the City where the SWDM references the King County code. There may be other instances where other City code chapters also apply. 9. All references in the SWDM and SPPM to the following maps shall be replaced by reference as indicated in Table 14.3. Table 14.3 Tukwila Maps Equivalent to King County Maps or Designation King County Map or Designation City of Tukwila Map or Designation Coal Mine Hazard Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Landslide Hazard Area and Landslide Drainage Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Water Quality Applications Map Not applicable. Aquatic areas (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Wetlands (as defined in Maps delineating stream and wetland types and W:\PW Eng\1'RO)EcTS\A• DR Proiects\:`PUES Program (993412I01%2015 2017 Capacity Grant\Otak UU Gap Analvsis12016 KCSWUM O inance(flmft 2016 KCSWDM Codified RT Trackcd.docW:`PW .'-_'.,l,....•C �.. ,. _ i rnm (07? 1I,..,.UOI ,O .,._,...J. I A all. v ,�, ,,..s..r•e..,,... -t 12 l \ KCC 21A.06) their associated buffers within Tukwila are available at the Department of Community Development service desk. Seismic Hazard Areas Defined and regulated through the Washington State Building Code. Flood Hazard Area (as defined in KCC 21A.06) Flood Plain Management will be regulated through TMC 16.52. r Steep Slope Hazard Area (no map referenced in the KCSWDM) Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Critical Aquifer Recharge Area (as defined in KCC 21A.06) Not applicable. Wildlife Habitat Conservation Area (as defined in KCC 21A.06) Fish and wildlife habitat conservation areas will be regulated through TMC Chapter 18.44, Shoreline Overlay District and the regulations in TMC Chapter 18.45 related to wetlands and watercourses. Wildlife Habitat Networks (as defined in KCC 21A.06) No equivalent. All references in the SWDM to the Stormwater Pollution Prevention Manual shall mean and refer to the SPPM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. All references in the SPPM to the Stormwater Design Manual shall mean and refer to the SWDM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. The definition of Critical Drainage Area in Chapter 1 of the SWDM is amended by striking "by administrative rule under the procedures specified in KCC 2.98." The reference in Section 1.1.2.4 of the SWDM to Urban Planned Development shall mean and refer to the equivalent such designation under the City of Tukwila Comprehensive Plan as determined by the City of Tukwila Community Development Director. The note following the third sentence of Section 1.1.3 of the SWDM is stricken. The last paragraph of Section 1.1.4 beginning with "Additional mitigation" is stricken. The reference in Section 1.2.2 at paragraph 2 of the SWDM to KCC 21A.24.110 shall mean and refer to the applicable provision of Title 19 of the Tukwila Municipal Code. All references to Critical Area Review in the SWDM and the SPPM shall mean and refer to Critical Area Review pursuant to Title 18 of the Tukwila Municipal Code. References in the SWDM and SPPM to Chapter 16.82 of the King County Code shall mean and refer to the clearing and grading provisions of Title 16 of the Tukwila Municipal Code. Subsection F of Section 1.2.4.3 of the SWDM is omitted. The reference in Section 1.2.7 to King County Ordinance 12020 shall mean and refer to the financial guarantee requirements of the applicable provisions of the W.\PW En,\PROJECTSIA- DR Projects lls1PDES Prggrarn (993412101\201 S 2017 Capacity Grant\Utak 1d17 Gao Analvsis.2016 KCSWDM Urdinance\Draft 2016 KCSWUM Codified RTTracked.doc GV.ksn9nnm6 ^„«„'"'<„nn„tom„,<n„ .„„ ,,, ,,,,.,..,o „ „ <o „ „.erg Page 8 of 15 13 Tukwila Municipal Code or the Public Works Surface Water Regulations and Procedures. Section 1.4.4 of the SWDM is stricken and replaced with the following: All variances ("Adjustments") from Chapter 14.30 of the TMC, the SWDM and the SPPM shall be governed by the procedures, standards and requirements set forth in Chapter 18.72 of the Tukwila Municipal Code, as it now exists or may hereafter be amended. The reference in Section 1.4.5 of the SWDM to KCC 20.20 shall mean and refer to the applicable provisions of Title 18 of the Tukwila Municipal Code. References to offices of King County shall mean and refer to the equivalent offices of the City of Tukwila. Except when the context indicates otherwise, references in the SWDM and the SPPM to specific codes or sections of codes of King County, such as the King County critical areas code, shoreline management code, clearing and grading code, and road standards, shall mean and refer to the equivalent codes or sections of codes of the City of Tukwila. 14.30.070 Permits. A. The application for and issuance of a surface water/storm drainage permit constitutes the administrative mechanism for the enforcement of the provisions contained herein. Such permits shall be non -transferable without approval of the Public Works Director and shall be limited to the specific activities for which they are granted. B. Activities that trigger drainage review pursuant to the Surface Water Design Manual require a permit. Permit application shall be made to the City's permit center. C. All plans, drawings and calculations shall be prepared, stamped, signed and dated by a registered professional engineer, licensed in the State of Washington. A single-family residence that is not in a sensitive area and does not trigger drainage review may be exempt from this requirement. D. The submittals for the permit must meet or exceed the minimum criteria in the Surface Water Design Manual and the City's Development Guidelines and Design and Construction Standards. The Director may require additional submittals to those described therein. E. Any significant changes to the approved plans or specifications of a permitted project require a revision submittal to the City for approval before the changes are implemented. 14.30.080 Stormwater Drainage System Maintenance and Inspection Requirements. A. All Stormwater Drainage Systems. All public and private stormwater drainage systems providing permanent stormwater treatment and/or flood control shall be inspected and maintained in accordance with the standards contained in the Surface Water Design Manual. The following are additional minimum standards for the maintenance of all stormwater drainage systems: 1. All stormwater treatment and flow control components of stormwater drainage systems shall be inspected annually, but the frequency of such inspections may be reduced based on inspection records. Owners of private stormwater drainage systems shall be responsible for maintenance, inspection and corrections. The City will perform periodic inspections of these same stormwater drainage systems. 2. When an inspection identifies an exceedance of the maintenance standard, maintenance shall be performed by the owner or person in control of the stormwater drainage systems within the following time period: W:1PW EnR PROJECTSIA- DR Proiects\NPDES Proeram (993412I0112013 2017 Capacity Grant\Otak LID Gan Analvsis12016 KCSWDM OrdinancclDraft 2016 KCSWDM Codified RTTrackcd.da 14 a. Within one year for wet pool facilities, infiltration facilities, and detention facilities including detention pipes, ponds and valves; b. Within six months for routine maintenance operations; c. Within nine months for maintenance requiring re -vegetation; and d. Within two years for maintenance that requires capital construction of less than $25,000.00. 3. The Director or his or her designee may order corrective maintenance to occur within a specific time period. 4. The Director has unlimited access - at all reasonable times - to any property whenever the Director has reasonable cause to believe violations of TMC Chapter 14.30 are present or operating on a subject property, whenever necessary to make an inspection or perform activities to enforce any provisions of TMC Chapter 14.30, whenever necessary to monitor proper function of drainage facilities or whenever the condition of a surface water system presents imminent hazard. 5. When the City has given a stormwater drainage system owner or person in control prior notification and the owner or person in control has failed to maintain such stormwater drainage system or when conditions make it impossible to give prior notice, the City may perform the required maintenance or repairs with the cost of said work assessed as a lien against the properties responsible for the maintenance. This action shall be in addition to any other enforcement provisions provided in TMC Chapter 14.30. 6. Maintenance of private stormwater drainage systems and implementation of best management practices are the responsibility of the owners and persons in control of the stormwater drainage systems. 7. If the property owner(s) or person in control does not maintain the stormwater drainage system as prescribed in the approved maintenance schedule, the Director may issue a written notice specifying the required actions and setting a time frame for completion of the specified actions. If these corrective actions are not performed in a timely manner, the City or a private contractor hired by the City may enter the property to perform the actions and bill the property owner(s) and/or person in control for the cost of the work. In the event the Director determines a hazard to public safety exists, written notice is not required. B. New Facilities. 1. For privately -owned stormwater drainage systems, the applicant shall provide a monitoring and maintenance schedule for the life of each stormwater drainage system or component thereof or best management practice resulting from the development. At a minimum, the schedule shall describe the maintenance activities, spell out the frequency for each activity and state who performs and who pays for each activity. 2. The monitoring and maintenance schedule shall provide unlimited access, at all reasonable times, to the stormwater drainage systems for inspection by the Public Works Department. 3. The Director shall review and approve the monitoring and maintenance schedule before the applicant records the schedule with King County Records. 4. Owners of projects distributing over one acre must maintain records of facility inspections and maintenance actions. Records shall be retained for a period of at least ten years. These maintenance records are to be provided to the City upon request. W PW Erts1PMECrS\A- UR Proiccts\NPUES Projram 0934 12101\1015 2017 Capacity (3 nt\Otak UD Gap Anatysis12016 KCSWDK Grdiaance(Draft 2016 KCSWUM Codified RT Trscked.doc Page 10 of 15 15 5. For new residential developments in excess of 1 acre, additional inspections are required of all new flow control and water quality treatment facilities, including catch basins, every six months during the period of heaviest residential construction (i.e., 1 to 2 years following subdivision approval) to identify maintenance needs and enforce compliance with maintenance standards as needed. The City will perform periodic inspections of these same stormwater drainage systems. 14.30.090 Special Drainage Fee. When the City accepts stormwater drainage system infrastructure that requires upkeep in excess of normal maintenance, the City has the right to charge the benefiting parties a special drainage fee in addition to the City's normal surface water charge, as condition of turnover, in order to cover costs for this maintenance. 14.30.100 Inlet Marking. A. All new inlets and catch basin grates, public or private, shall be marked "No Dumping! Drains to Stream." In addition, a four inch raised pavement marking that states "No dumping Drains to Streams" or equivalent as approved by the Public Works Director. B. Existing inlets and catch basin gratess, in areas being resurfaced or when being modified or replaced, shall be marked "No Dumping! Drains to Stream." In addition, a four inch raised pavement marking that states "No dumping Drains to Streams" or equivalent as approved by the Public Works Director. C. The marking shall meet the standard in the City's Development Guidelines and Design and Construction Standards. 14.30.110 Trash -En lesffes and Waste Receptacles A. Restaurants, including food preparation facilities and facia ies that have been dctermined to h ave-pollution-generating-activities shall 1.a dcdicateEl trash which = eetcd to the nitaw• , facilities with an outdoor trash compactor, or facilities that have been determined to have pollution generating waste activities, shall have a dedicated roof covered trash enclosure that drains to a catch basin connected to a grease interceptor that drains to the sanitary sewer. The trash enclosure area shall be kept clean and contained and not allowed to drain to a storm drainage system. B. sa .,taincrs shall 1.e kept c ere,1 _at _allures and shall have spill elleWet4-40--Elfft41-40--a-S4erfft-tifainage-systein-eF-saftitafr -sewer-system. Dumpsters, garbage and waste containers shall be leak -proof and kept closed or lidded at all times except for when disposing of waste materials. C. Grease storage containers shall be kept covered at all times and shall have spill containment. The area shall be kept clean and clear of any fats, oil or grease and not allowed to drain to a storm drainage system or sanitary sewer system Dumpsterrs; 14.30.440120 Financial Guarantees. A. The Public Works Director may require from the applicant a surety, cash bond, irrevocable letter of credit or other means of financial guarantee acceptable to the City, prior to approving the permit. B. The amount of the financial guarantee shall not be less than the total estimated construction cost of all interim and permanent stormwater control facilities and shall not be fully released without final inspection and approval of completed work by the City. W:1PW ImpiPROJECTSIA- DR ProiectsWPDES Program (9934121002015 2017 Capacity GrantiOtak LID Gap Analvsist2016 KCSWP1 t Ordinance' 3mft 2016 KCSWUM Codified RT Tracked.da GV:ksn 9n201 Page 11 of 15 16 C. For developments that may involve a risk of property damages or possible hazards, the Public Works Director may require the provision of financial guarantee (bond, note, letter of credit, etc.) with the City to mitigate damages should they occur. The following provisions shall apply in instances where such financial guarantees are required: 1. Such bond or other proof of financial guarantee shall not exceed 150% of the estimated cost of constructing and maintaining those improvements which are the source of the risk or potential hazard; provided that, in the case of surface water activities which do not involve expenditures at least equal to the cost of remedying the possible adverse impacts of such activities, the required financial guarantee shall be equal to City staff's best estimate of the possible cost directly associated with remedying the adverse impacts to public or private properties not associated with the development. 2. The amount of any financial guarantee shall not serve as a gauge or limit to the compensation collected from a property owner because of damages associated with any surface water activity. D. The City shall retain the financial guarantee until the completion of any project involving surface water activity or following a prescribed trial maintenance period. E. The City of Tukwila may redeem financial guarantees provided in accordance with this provision in whole or in part upon determination by the Public Works Director that any or all of the following circumstances exist 1. Failure on the part of the party providing such financial guarantee to fully comply, within the time specified, with approved plans and/or any corrective or enforcement actions mandated by TMC Chapter 14.30; or, 2. Damages to public or private property arising from the activities for which the financial guarantee was required. 14.30.120 Insurance. A. If, in the opinion of the Public Works Director, the risks to property or life and safety associated with a proposed development activity are substantial, said official may require the property owner to purchase liability insurance coverage in the following minimum amounts: 1. Bodily injury liability - $1 million per occurrence. 2. Property damage liability - $1 million per occurrence. B. The Public Works Director may require higher policy limits than set forth in TMC Section 14.30.120A in those cases where the minimum amounts are deemed insufficient to cover possible risks. All insurance policies obtained in accordance with these provisions shall name the City of Tukwila as an "additional insured," and shall be written by a company licensed to do business in the State of Washington. Neither issuance of a permit, nor compliance with these provisions or any other conditions imposed by the City relieves any person from responsibility for damage to persons or property otherwise imposed by law, nor for damages in an amount greater than the insured amount. Issuance of a permit shall not form the basis of liability against the City for damages to persons or property arising from the development activities permitted by the City or otherwise undertaken by any person. 14.30.130 Exceptions. A. Requested by Applicant. W:\'W Ene1PROJECPSIA- DR Proiects\NPDES Provram (99341210112015 2017 Capacity GraniK)tak LII) Gan Analvsis12016 KCSWDM. Ordinance\haft 2016 KCSWDM Codified RT Tracked.doc Page 12 of 15 17 1. The Director may grant a written exception from any requirements of TMC Chapter 14.30 if there are exceptional circumstances applicable to the site such that strict adherence to the provisions contained herein will result in unnecessary hardship and not fulfill the purpose of TMC Chapter 14.30. The cost to design and construct the improvements shall not constitute hardship and shall not form the basis for an exception. 2. The applicant shall provide the Director a written request stating the specific exception sought and the reasons supporting the exception. 3. The Director may grant an exception to TMC Chapter 14.30 only if all of the following criteria are met a. Strict compliance with the provisions of TMC Chapter 14.30 may jeopardize project feasibility and reasonable use of property; b. Proposed drainage facilities are consistent with the purpose and intent of TMC Chapter 14.30; c. Granting the exception or standard reduction will not be detrimental to the public welfare, public safety, existing drainage systems or other property in the drainage basin; and d. The recommendation of a registered civil engineer supports the exception. B. Low Impact Development. 1. In order to achieve the City's goal of increasing the amount of development with less impervious surface, the Director may approve exceptions to Public Works standards, including street standards. Exceptions requiring approval under the land use codes, such as parking and landscaping, must be made to the Department of Community Development. 2. The applicant shall provide justification for each exception and shall show that the project meets all other TMC requirements and that the project has a reasonable assurance of long-term success. 3. Each exception shall be assessed on the following criteria: a. The result will compensate for or be comparable with surface water flow control and treatment that is in the public's interest; b. The exception contributes to and is consistent with achieving low effective impervious surface area within a development; c. The exception contains reasonable assurances that low effective impervious surfaces will be achieved and maintained; d. Granting of the exception will not threaten public health and safety; e. The exception meets or is consistent with generally accepted engineering design practices; f. The exception promotes one or more of the following: (1) Innovative site or housing design; (2) Increase in on -site surface water retention using native vegetation; (3) Retention of at least 60% of natural vegetation conditions over the site; (4) Improved on -site water quality beyond that required in current standards adopted by the City; W:1PW Etta\PRGJECT51A UR Proiccts4NP[)ES Program (99341210)12015 2017 Capacity Grant\Gtak Llt) Gan Analvsis12016 KCSW DM Grdinancc\Dralt 2016 KCSWDM Codified RT Tracked.doc Page 13 of 15 18 / 1 . i (5) Retention or recreation of predevelopment and/or natural hydrologic conditions to the maximum extent possible; and (6) Reduction of effective impervious surface to lowest extent practicable. g. The exceptions do not present significantly greater maintenance requirements at facilities that will eventually be transferred to the public ownership; h. Covenant, conditions and restrictions necessary for native growth protection easements, impervious surface restrictions and other such critical features necessary for the exceptions will be recorded against and will be binding against all affected properties. C. The Director may require a monitoring and evaluation plan in order to measure performance of specific elements in the exceptions. D. The Director may require a performance bond for 150% of the installation cost of the exceptions. E. The Director may require a two-year maintenance bond for 20% of the construction cost. 14.30.140 Liability. Liability for any adverse impacts or damages resulting from work performed in accordance with any permit issued on behalf of the City of Tukwila for the development of any site within the City limits shall be the sole responsibility of the applicant. 14.30.150 Penalties. The following penalties shall be applied in whole or in part for the violation of permit conditions or for the failure to obtain permits required for activities regulated by TMC Chapter 14.30. All remedies shall be considered cumulative in addition to any other lawful action. Each day that a violation of this code is committed or permitted to continue constitutes a separate offense to which both the civil and criminal penalties set forth below shall apply. 1. The violation of or failure to comply with any order or requirements made in accordance with the provisions of TMC Chapter 14.30 is a civil violation. The provisions of TMC Chapter 8.45 shall be used to enforce this code. 2. It shall not be a defense to the prosecution for failure to obtain a permit required under TMC Chapter 14.30 that a contractor, subcontractor, person with responsibility on a site or person authorizing or directing the work erroneously believed a permit had been issued to the property owner or any other person, 14.30.160 Abatement. The City may abate any surface water activity that is deemed a public nuisance and is performed in violation of TMC Chapter 14.30 or any lawful order or requirement of the Director. 14.30.170 Injunctive Relief. A. Whenever the City has reasonable cause to believe that any person is violating or threatening to violate TMC Chapter 14.30 or any rule or other provision adopted or issued pursuant to TMC Chapter 14.30, it may either before or after the institution of any other action or proceeding authorized by TMC Chapter 14.30 institute a civil action in the name of the City for injunctive relief to restrain the violation or threatened violation. Such action shall be brought in King County Superior Court. B. The institution of an action for injunctive relief under TMC Chapter 14.30 shall not relieve any party to such proceedings from any penalty prescribed for violations of TMC Chapter 14.30. 14.30.180 Appeals. The appeals process for/by any person aggrieved by the action of the City is provided under TMC Chapter 8.45, "Enforcement." W:1PW Ene\PROJECTSIA- DR Proiects\NPDES Proeram (993412101\2015 2017 Canacity Grant'Otak LID Gan Malvsis12010 KCSWDM OrdinanceUhaft 2016 KCSWDM Codified RT Tracked doe 1 .1,...111.t,, Ir 1' ..1Y10n/ ntl 11/l11101 C 1,1 / /�.. GV:ksn VrnnInvyt Page 14 of 15 19 Section 2. Repealer. Ordinance No. 2064 is hereby repealed. Section 3. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 4. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force five-istaysOn December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of 20432016. A 1-1"hST/ AUTHENTICATED: Christy O'Flaherty, CMC, City Clerk APPROVED AS TO FORM BY: Jtin44aggeftenAllan Ekberg, Mayor Filed with the City Clerk: Passed by the City Council: Published: Effective Date: Office of the City Attorney Ordinance Number: Attachments: Exhibit A - The 2009-2016 King County Surface Water Design Manual (KCSWDM) Exhibit B - The 2009-2016 King County Stormwater Pollution Prevention Manual (KCSPPM) W:WW Eng\PROJECTS\A- DR ProiectsWPDES Pron am (99341210112015 2017 Capacity Grant1Otak 1 ID Gan Analvsis\2016 KCSWDM Ordinance \Draft2016 KCSWDM Codified RT Tracked doc Page 15 of 15 20 l N. Low Impact Development Milestones and Adoption Schedule 1. December 16, 2015 - LID Gap Analysis Consultant Agreement with Otak, Inc. signed. 2. February 5, 2016 - Staff & Otak begin LID coordination teleconference bi-weekly meetings. 3. February 23, 2016 LID Team Introduction Kickoff meeting with Otak and key department staff, PW, DCD, Fire, Water, Sewer/Surface Water, Street, and Parks Departments - Otak Utilities Committee LID Code Update presentation - PW/Otak 4. March 21, 2016 - LID Team second meeting and review LID gap analysis - Otak - Transportation Committee Lid Code Update presentation - PW 5. May 14, 2016 - Provide LID information booth at Wildlife Festival — PW 6. April 29, 2016 - Review TMC & King County SWDM equivalency - PW 7. May 25, 2016 - PW staff begin review of LID Code Update findings and recommendations report - Otak begins developing plant list 8. June 20, 2016 - LID Code recommendation finalization teleconference meeting 9. July 8, 2016 - Otak begins Infrastructure Design and Construction Standards updates and Standard details updates 10. August 10, 2016 - Surface Water Low Impact Development Open House held at TCC PW 11. August 29, 2016 - Online Agenda Item Submission Form submitted to City Clerk's Office — PW 12. September 6, 2016 - Submit Utilities Committee info memo to RL/GL/SM. Attach LID schedule, Utilitiies and Transportation Committee previous minutes (FYI) — PW Brief City Administrator on LID code amendments & KCSWDM adoption items — PW 13. September 9' 2016 Otak submits final draft of TMC 16 & 18. Forward three draft code revisions (TMC 14,16, and 18) to Moira/DCD to send to Department of Commerce (60 day comment period) - PW 14. September 13, 2016 - Utilities Committee, request approval to adopt TMC Title 14 -2016 King County Surface Water Design Manual and forward to COW. - Info memo PW 21 W:\PW Eng\PROJECTS\A- DR Projects\NPDES Program (99341214\2015 2017 Capacity Grant\Otak LID Gap Analysis\LID Adoption Schedule GAV.docx Request approval to forward code amendments to Title 18 to the October 27, 2016 Planning Commission for Public Hearing and recommendation - Info memo PW Executive Staff Title 14 Ordinance review period over. Forward Title 14 Ord. to City Attorney & City Clerk's office for review and preparation - PW 15. September 26, 2016 Committee of the Whole, request approval to adopt the 2016 King County Surface Water Design Manual and 2016 Stormwater Pollution Prevention Manual. Forward to Council Regular Meeting. PW. 16. September 27, 2016 - Utilities Committee, request approval to adopt Title 16 - Grading 17. October 11, 2016 (or sooner) - Submit Public Notlice to Wynetta/DCD for Planning Commission Public Hearing — PW 18. October 13, 2016 - Submit Planning Commission packets, Title 18, to Wynetta/DCD - PW 19. October 19, 2016 (or sooner) - Submit Public Notice language/description for Ordinance 16, & 18. 20. October 31, 2016 - Public Hearing notice publish date for Nov. 14th COW Public Hearing 21. October 27, 2016 Planning Commission, LID presentation by OTAK. TMC, Title 18 - Zoning, Chapter 18.06, 18.20, 18.28, 18.52, 18.56 — OTAK, PW - Anticipate Planning Commission recommendations to Committee of Whole on November 14th 22. November 9, 2016 - Expect Department of Commerce notice 23. November 14, 2016 Committee of Whole, LID presentation by OTAK, Public Hearing on draft ordinances, for Title 14, 16 & 18. Otak, PW. Anticipate COW to forward recommendations to Council Regular meeting on November 215t Present Planning Commission LID finding & recommendations. Request forwarding recommendations to Council regular meeting November 215t 24. November 21, 2016 - Council Regular meeting. Anticipate adoption of TMC Title 14, 16, and 18 - with effective dates of December 31, 2016. 22 W:\PW Eng\PROJECTS\A- DR Projects\NPDES Program (99341210)\201S 2017 Capacity Grant\Otak LID Gap Analysis\LID Adoption Schedule GAV.docx City of Tukwila Allan Ekberg, Mayor INFORMATIONAL MEMORANDUM TO: Utilities Committee FROM: Bob Giberson, Public Works Director BY: Greg Villanueva, NPDES Coordinator CC: Mayor Ekberg DATE: September 9, 2016 SUBJECT: National Pollutant Discharge Elimination System (NPDES) Project NO. 99341210 Low Impact Development Code Update — TMC Title 18 ISSUE Review new LID code updates to Tukwila Municipal Code (TMC) Title 18 - Zoning. BACKGROUND The City's National Pollutant Discharge Elimination System (NPDES) Phase II permit requires the City to review, revise, and make effective their local development related codes, rules standards, or other enforceable documents to incorporate and require Low Impact Development (LID) principles and LID Best Management Practices no later than December 31, 2016. As part of this effort, the City's consultant, Otak, and staff from various departments reviewed all development codes to determine which required updating to facilitate LID implementation and remove barriers. TMC Title 18 — Zoning was determined to not be consistent with Department of Ecology requirements and requires updating. ANALYSIS Staff, working with Otak, identified LID code updates that needed to be inserted into Title 18 — Zoning. Draft amendments to this code have been made in strikeout & underline in codified format for review and comment by the Planning Commission. FINANCIAL IMPACT No financial impact. RECOMMENDATION Utilities Committee approval to forward the proposed changes to TMC Title 18 — Zoning to the Planning Commission for review and comment. Final amendments, in Ordinance form, will return to Utilities Committee and full Council for final approval and adoption in the 4th Quarter of 2016. Attachments: Draft Zoning Ordinance (codified version). W:\PW Eng\PROJECTS\A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\Info Memo 2016 UC LID Code Update RDL2 sb.doc CHAPTER 18.06 DEFINITIONS 18.06.586 Native Vegetation "Native vegetation" means plant species, other than noxious weeds, that are indigenous to the coastal region of the Pacific Northwest and that reasonably could be expected to have occurred naturally on the site. Examples of these plant species include Douglas fir, westem hemlock, westem red cedar, alder, big -leaf maple, vine maple, willow, elderberry, salmonberrv, salal, sword fern, foam flower, and fireweed.eetatien with (Ord. 2347 §21, 2011) CHAPTER 18.20 RESIDENTIAL COMMERCIAL CENTER (RCC) DISTRICT 18.20.080 Basic Development Standards Development within the Residential Commercial Center District shall conform to the following listed and referenced standards: RCC BASIC DEVELOPMENT STANDARDS Lot area, minimum 5,000 sq. ft, I Lot area per unit (multi -family), minimum 3,000 sq. ft. Setbacks to yards (min.): • Front 20 feet • Second front 10 feet • Sides 5 feet • Sides, if any portion of the 10 feet yard is within 50 feet of LDR, MDR, HDR 1 • Rear 10 feet Height, maximum 3 stories or 35 feet Landscape requirements (minimum): All setback areas shall be landscaped. Required landscaping may include a mix of plant materials, biorefention facilities, pedestrian amenities and features, outdoor cafe -type seating and similar features, subject to approval. See Landscape, Recreation, Recycling/Solid Waste Space chapter for further requirements • Front 20 feet • Second front 10 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet Recreation space 200 sq. ft. per dwelling unit (1,000 sq. ft. min.) Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See Accessory Use section of this chapter • Office, minimum 3 per 1,000 sq. ft. usable floor area • Retail, minimum 2.5 per 1,000 sq. ft. usable floor area • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations Performance Standards: Use, activity and operations within a structure or a site shall comply with (1) standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, (2) TMC Chapter 8.22, "Noise", and, (3) adopted State and Federal standards for water quality and hazardous materials. In addition, all development subject to the requirements of the State Environmental Policy Act, RCW 43.21 C, shall be evaluated to determine whether adverse environmental j impacts have been adequately mitigated. (Ord. 1976 §39, 2001; Ord. 1872 §3, 1999; Ord. 1758 §1 (part), 1995) 24 / \ CHAPTER 18.28 TUKWILA URBAN CENTER (TUC) DISTRICT 18.28.070 Structure Height A. The minimum and maximum height of a structure shall be as specified by District or modified by a special height overlay. See Table 3, "District Standards." 1. Structures oriented to Baker Boulevard shall have an average height at least as high as the minimum listed in Table 18-3, "District Standards." B. Pond Edge Height Limit. 1. Development located within 150 feet of the edge of Tukwila Pond is not eligible for incentive height increases. 2. The maximum height in this location shall be as specified by District. C. Public Frontage Improvement Height Incentive. 1. As an incentive to provide public frontage improvements and/or new streets that are not otherwise required under this code, allowable structure heights may be increased to the limits as specified for each District as shown in Table 18-3, "District Standards," when: a. Developers construct public frontage improvements along their parcel frontages on existing streets, constructed to the standards of this code; or b. Developers construct new 20 foot wide half streets with one side of public frontage improvements, constructed to the standards of this code; or c. The existing sidewalk width and configuration along a parcel's frontage meets or exceeds the public frontage standard and, when averaged, the landscape width and street tree spacing meet the required public frontage standard. Additional sidewalk width may substitute for an equal area of landscaping. d. In order to take advantage of this incentive, the public frontage improvements must start and stop at property boundaries, intersections or traffic signals and transition safely to neighboring conditions. 2. The public frontage height incentive will be applied proportionally to parcels with more than one frontage based on the following: a. Each frontage will be evaluated separately based on its Corridor Type's public frontage standards. b. The height bonus will be applied to a percentage of the total building footprint(s) on site based on the percentage of the parcel's total public frontage that, when averaged, meets the public frontage standard. For example, when averaged, if one of a parcel's two similar length frontages meets the corridor's public frontage standard, then 50% of the total building footprint on site is eligible for the height incentive. D. Multi -Family Height Incentive. 1. As an incentive to construct residential dwelling units, allowable structure heights may be increased to the limits specified in Table 18-3, "District Standards." 2. Structures may be completely residential or mixed use, with residential uses comprising at least half of the occupied floor area of the building. E. Structured Parking Height Incentive 1. As an incentive to reduce impervious cover associated with parking lots and increase areas of native vegetation, allowable structure heights may be increased to the limits specified in Table 18-3, "District Standards," when: a. Developers place a minimum of 80 percent of the minimum required parking stalls within structured panting (transferred parking); and b. Developers restore as a native growth retention area an area equal to 40 percent of the area that otherwise would have been needed to construct the transferred parking as a surface lot. 2. In order to take advantage of this incentive, the native growth retention area must meet specifications of the native vegetated landscape of the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30 and must be set aside by a covenant, easement, or tract and rerved and maintained for the life of the protect. €F. Structures qualify for increased height as set forth in Table 18-3, "District Standards," when integrating any of the following combination of height incentives: 1. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that meet the requirements of two of the three available height incentives: both -the frontal improvement, an8-multi-family, or structured ng-height-ihoentive-requirerhehts. ement 2. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that achieve a LEED certification of silver or higher and meet either the requirements of one of the three available height incentives: the frontal improvement--or—multi-family, or structured parking 3. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that meet the multi -family height incentive requirements and make at least 20% of the residential units affordable per the standards in WAC 365-196-870. For rental units, affordability is set at 50% of the county median family income, adjusted for family size. For owner -occupied units, affordability is set at 80°/m of the county median family income, adjusted for family size. (Ord. 2443 §8, 2014) 18.28.240 General Landscaping A. The provisions herein are applicable to setbacks, public frontage areas, open space, and other areas on - premises. These regulations address plant materials and design, visibility, irrigation, landscape plans, utility and service areas. B. General Landscaping Requirements. 1. Plant Materials. a. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 25 b. All plant material shall meet the most recent American Standards for Nursery Plant Stock (ANSI Z60.1). c. Evergreen trees shall be a minimum of 6 feet in height at time of planting. d. Deciduous trees shall be a minimum 2.5 inch caliper six inches off the ground when installed. e. Shrubs shall be at least 18 inches in height at time of planting. f. Existing vegetation may be used to meet the perimeter landscaping requirements. All significant trees located within any required perimeter landscape area that are not dead, dying, or diseased and that do not pose a safety hazard as determined by the City or a qualified arborist shall be retained and protected during construction with temporary fencing or other enclosure, as appropriate to the site. The area designated for protection will vary based on the tree's diameter, species, age, and the characteristics of the planted area. Property owners may be required to furnish a report by an International Society of Arborsst (ISA) certified arborist to document a tree's condition. The Director may require that an ISA certified arborist be retained to supervise tree protection during construction. Grade changes around existing trees are to be avoided whenever possible. g. New plant materials shall include native species or non-native species that are drought tolerant and have adapted to the climatic conditions of the Puget Sound Region. There must be a diversity of tree and shrub genus and species in the site landscaping, taking into account species in existing development around the site. h. No species that are listed on the State or King County noxious weed lists may be planted. i. Plant materials shall be selected that reinforce the landscape design concept, and are appropriate to their location in terms of hardiness, tolerance to urban conditions, maintenance needs and growth characteristics. Large and medium canopy tree species are required, except where there is insufficient planting area (due to proximity to a building, street light, above ground or underground utility line, etc.). 2. Visibility. a. Design of new landscaping and maintenance of existing landscaping shall consider Crime Prevention Through Environmental Design (CPTED) principals and visibility for safety and views. Appropriate plant species shall be specified to avoid the need for excessive maintenance pruning. Trees along the street frontages, as they mature, shall be limbed up to a minimum height of 6 feet (8 feet where they extend over sidewalks) to allow adequate visibility and clearance for vehicles. Trees may be pruned to improve views of signage and entryways by using such techniques as windowing, thinning, and limbing-up. However, no more than 1/4 of the canopy may be removed within any 2-year period, and the crown should be maintained to at least 2/3 the height of the tree. All pruning shall be dome in accordance with ANSI Standard A-300 specifications. Trees may not be topped for any reason. Trees may only be pruned to lower their height to prevent interference with an overhead utility or electrical line, with prior approval by the Director. b. Landscaping shall not obstruct views from or into the driveway, sidewalk or street. Landscape design shall allow for surveillance from streets and buildings and avoid creating areas that might harbor criminal activity. c. Landscaping at crosswalks and other locations where vehicles and pedestrians intersect must not block pedestrians' and drivers' views. d. Evergreen shrubs and trees shall be used for screening along rear property lines, around solid waste/recycling areas and mechanical equipment, and to obscure grillwork and fencing associated with subsurface parking garages. 3. Soil Preparation and Planting. a. For trees planted in sidewalks and parking lots, Cornell University CU-Structural Soils must be used to a preferred depth of 36 inches, to promote tree root growth and provide structural support to the paved area. Minimum soil volumes for tree roots shall be 750 square feet per tree (see specifications and sample plans for CU-Structural Soils). Trees and other landscape materials shall be directly planted into a planting mix, approved by the Director, that is installed on top of the structural soils. b. For soil preparation in bioretention areas, existing soils must be protected from compaction, and bioretention soil media must be prepared in accordance with Bioretention Soil Media Standard Specifications from the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30 to promote a proper functioning bioretention system. These specifications shall be adhered to regardless of whether a stormwater permit is required from the City. 14c. For all other plantings, soils must be prepared for planting in accordance with specifications to restore soil moisture holding capacity in accordance with TMC Chapter 16.54, Grading , " Quality_and_Depth,2_4rem__the__washimten_Department of regardless of whether a stormwater permit is required by the City. ad. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting to ensure soils are properly prepared. de. Installation of landscape plants must comply with best management practices including: (1) Planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball. (2) Root balls of potted and balled and burlapped (B&B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B&B plants prior to planting. (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the 26 f...\ f � surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3-inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns of perennial plants. 4. Irrigation. a. The intent of this standard is to ensure that plants will survive the critical establishment period when they are most vulnerable due to lack of watering. b. All required plantings must be served by a permanent automatic irrigation system. (1) Irrigation shall be designed to conserve water by using the best practical management techniques available. These techniques may include, but not be limited to: drip irrigation to minimize evaporation loss, moisture sensors to prevent irrigation during rainy periods, automatic controllers to insure proper duration of watering, sprinkler head selection and spacing designed to minimize overspray, and separate zones for turf and shrubs and for full sun exposure and shady areas to meet watering needs of different sections of the landscape. (2) Exceptions to the irrigation requirement may be approved by the Director, such as xeriscaping (i.e., low water usage plantings), plantings approved for low impact development techniques, established indigenous plant material, or landscapes where natural appearance is acceptable or desirable to the City. However, those exceptions will require temporary irrigation until established. 5. Landscape Plan Requirements. a. A Washington State licensed landscape architect shall prepare and stamp the landscape plans in accordance with the standards herein. Detailed plans for landscaping and screening shall be submitted with plans for building and site improvements. Included in the plans shall be type, quantity, spacing and location of plants and materials; typical planting details; and the location of irrigation systems. Underground and at -ground utilities shall be shown on the plans so that planting conflicts are avoided. b. Installation of the landscaping and screening shall be completed and a Landscaping Declaration submitted by the owner or owner's agent prior to issuance of the Certificate of Occupancy. If necessary due to weather conditions or construction scheduling, the installation may be postponed to the next planting season if approved by the Director and stated on the building permit. A performance assurance device equal to 150% of the cost of the labor and materials must be provided to the City before the deferral is approved. 6. Parking Lots. a. Setback and Perimeter Landscaping: (1) Surface parking lots shall set back a minimum of five feet from any open space, building facade, or Corridor back of sidewalk. The setback shall be designed and planted with: (a) 1 evergreen shrub per 4 linear feet of property line, excluding curb cuts. (b) Sufficient live groundcovers of varying heights, colors and textures to cover, within 3 years, 100% of the yard area not needed for trees and shrubs. Groundcover must be planted with a minimum spacing of 12 inches on center for 4-inch pots and 18 inches on center for 1- gallon pots. If turf grass is being used as the groundcover, a 3-foot diameter ring of bark mulch is required around any tree. (2) Surface parking lots shall be buffered from adjacent residential development with heavy screening in the side and rear setback areas. b. Interior Parking Lot Landscaping: (1) For surface parking lots adjacent to public or private streets, a minimum of 20 square feet of interior parking lot landscaping is required for each parking stall. In the Workplace District, a minimum of 15 square feet per stall is required for warehouse and light industrial uses. (2) For surface parking lots located behind buildings or otherwise screened from public or private streets or public spaces, a minimum of 10 square feet of interior parking lot landscaping is required for each parking stall. (3) Flexibility is allowed for the layout of parking lots and landscaped areas, but the goal is to provide shade from trees that are evenly distributed throughout the parking lot. Planting trees in continuous, landscaped planting strips between rows of parking is encouraged. This approach may also be combined with surface water management design. For parking lots adjacent to public or private streets, if landscape islands are designed into the parking lot layout to divide continuous rows of parking stalls, they must be placed at minimum spacing of every 10 parking spaces. For parking areas located behind buildings or otherwise screened from public or private streets or public spaces, if landscape islands are used, they shall be placed at a minimum of one island every 15 parking stalls. (4) Landscape islands must be a minimum of 6 feet wide and a minimum of 100 square feet in area. All landscaped areas must be protected from damage by vehicles (curbs, tire stops, other techniques). (5) Landscape islands shall be placed at the ends of each row of parking to protect parked vehicles from tuming movements of other vehicles. (6) A minimum of one large -canopy evergreen or deciduous tree or two medium -canopy trees are required for every 100 square feet of landscaped island, with the remaining area to contain a combination of shrubs, living groundcover, and mulch (see Figure 18-47). 27 Figure 18-47: A single tree planted with no other materials and little room for viability is not acceptable. 7. Utility and Service Areas. Utility easements and other similar areas between property lines and curbing shall be landscaped and/or treated with dust and erosion control planting or surfacing. Trees proposed under overhead transmission lines shall be approved by the City on a case -by - case basis. 8. Street Trees in the Public Frontage. a. Street tree spacing in the public frontage shall be as specified in the applicable Corridor Standards. For smaller stature trees (those with canopies at maturity of less than 20 feet), spacing should be every 20 feet. For larger canopy trees, spacing should be wider as appropriate to the mature spread of the tree. Spacing will also need to consider sight vision distance at intersections, driveway locations, and utility conflicts. b. Street trees in the public frontage shall be planted to at least the following spacing standards: (1) At least 3.5 feet back from the face of the curb and with an approved root barrier installed on the curb side. (2) At least 5 feet from underground utility lines. (3) At least 10 feet from power poles. (4) At least 7.5 feet from driveways. (5) At least 3 feet from pad -mounted transformers (except 10 feet in front for access). (6) At least 4 feet from fire hydrants and connections. c. When used, tree grates and landscaped tree wells shall be a minimum 36 square feet in size (6' x 6'). Tree grates are not encouraged, but when used grates must have easily removable rings so that sections of grate can be removed incrementally as the tree matures. Tree well size may be adjusted to comply with ADA standards on narrower sidewalks. Root barriers must be installed at curb face. See TMC Section 18.28.240.B.3, "Soil Preparation and Planting," for structural soil requirements. d. Planting and lighting plans shall be coordinated so that trees are not planted in locations where they would obstruct existing or planned street or site lighting, while maintaining appropriate spacing and allowing for their size and spread at maturity. 9. Maintenance and Pruning. a. Any landscaping required by this chapter shall be retained and maintained by the property owner for the life of the project in conformance with the intent of the approved landscape plan and this chapter. Maintenance shall include keeping all planting areas free of weeds and trash and replacing any unhealthy or dead plant materials. b. Pruning of trees is only allowed for the health of the tree, to maintain sight distances or sight lines into commercial areas, or if interfering with overhead utilities. All pruning must be done in accordance with American National Standards Institute (ANSI) A-300 specifications. No tree planted by a property owner or the City to fulfill landscape requirements, or any existing tree, may be topped or removed without prior approval from the City. If a tree is topped or removed without approval, it shall be replaced with a new tree that meets the intent of this chapter within 120 days or the property owner will be subject to code enforcement action per TMC Chapter 8.45. Options at the Director's discretion are to require replacement of the tree with a new tree of similar species that will achieve a similar canopy size at maturity, replace the tree with multiple smaller diameter trees of an appropriate species (only if there are limitations on space or conflicts with utility infrastructure), and/or require an in -lieu fee for off -site tree replacement. C. General Landscaping Considerations. 1. Plant Materials. a. Drought resistant species are encouraged in order to minimize irrigation requirements, except where site conditions within the required landscape areas ensure adequate moisture for growth. b. The mature size of selected tree species should be suitable to lot size, the scale of adjacent structures, and the proximity to utility lines. c. In general, deciduous trees with open branching structures are recommended to ensure visibility to retail establishments. More substantial shade trees are recommended in front of private residences. d. All trees should be selected and located so they will not obstruct views to showroom windows and building signage as they mature. e. Evergreen landscaping (Figure 18-48) is appropriate for screening utility vaults, loading docks and some storage areas. (Also see TMC Section 18.52.040 for screening outdoor storage areas.) 28 1 \ \ \. J Figure 18-48: Using evergreen landscaping to screen utilities f. Species selection is very important in grouped plantings (Figure 18-49). Drought tolerant species are strongly recommended and monoculture plantings are discouraged. Low maintenance cost and low replacement costs are two advantages of planting drought tolerant species in grouped configurations. Low (24-30 inches) shrubs, perennial or groundcover plantings that provide a superior degree of separation between the sidewalk and street at reduced maintenance costs may be used. Figure 18-49: Examples of landscaped tree wells 2. Design. a. Shade trees should be planted to shade buildings' east and west -facing windows to provide a balance between summer cooling and winter heating through solar gain. b. All landscaped areas should be designed to allow aquifer filtration and minimize stormwater run-off utilizing bio-swales, filtration strips, and bio-retention ponds where appropriate. (Ord. 2443 §25, 2014) 29 CHAPTER 18.52 LANDSCAPE, RECREATION, RECYCLING/SOLID WASTE SPACE REQUIREMENTS 18.52.020 Perimeter Landscaping Requirements by Zone District A. In the various zone districts of the City, landscaping in the front, rear and side yards shall be provided as established by the various zone district chapters of this title. These requirements are summarized in the following table, except for Tukwila Urban Center (TUC) requirements, which are listed in TMC Chapter 18.28. ZONING FRONT YARD DISTRICTS (SECOND FRONT) LANDSCAPE TYPE FOR FRONTS SIDE YARD REAR YARD LANDSCAPE TYPE FOR SIDE/REAR LDR (for uses other 2 than dwelling 15 units Type I 10 10 Type I MDR 151'2 Type 1 10 10 Type I HDR 151'2 Type 1 10 10 Type I MUO 15 (12.5)2 Type 17 54 54 Type 17 0 15 (12.5)2 Type 17 54 54 Type 17 RCC 20 (10)2'3 Type 17 54 10 Type II NCC 54 Type 17 , 04 04 Type II RC 10 Type I 54 04 Type 118 RCM 10 Type 1 54 04 Type 18 TUC — See TMC Chapter 18.28 CILI 12.55 Type 18 55 05 Type 118 LI 12.52 Type II 04 04 Type III HI 12.52 Type II 04 04 Type III MIC/L 55 Type II 05 05 Type III MIC/H 55 Type II 05 05 Type III TVS 152'3 Type II 04 04 Type III ISO 159'2 Type 1 010 010 Type III Notes: 1. Minimum required front yard landscaped areas in the MDR and HDR zones may have up to 20% of their required landscape area developed for pedestrian and transit facilities upon approval as a Type 2 special permission decision. Bioretention may also serve as 20% of the required front yard landscaping for MDR and HDR zones. 2. In order to provide flexibility of the site design while still providing the full amount of landscaping required by code, the front yard landscape width may be divided into a perimeter strip and one or more other landscape areas between the building and the front property line, if the perimeter strip is a minimum of 10 feet and the landscape materials are sufficient to provide landscaping along the perimeter and screening of the building mass. 3. Required landscaping may include a mix of plant materials, pedestrian amenities and features, outdoor cafe - type seating and similar features, subject to approval as a Type 2 special permission decision. Bioretention may also be used as required landscaping for RCC, TVS, and ISO districts. Required plant materials will be reduced in proportion to the amount of perimeter area devoted to pedestrian oriented space. 4. Increased to 10 feet if any portion of the yard is within 50 feet of LDR, MDR or HDR. 5. Increased to 15 feet if any portion of the yard is within 50 feet of LDR, MDR or HDR. 30 \ N 6. Increased to Type II if the front yard contains truck loading bays, service areas or outdoor storage. 7. Increased to Type II if any portion of the yard is within 50 feet of LDR, MDR or HDR. 8. Increased to Type III if any portion of the yard is within 50 feet of LDR, MDR or HDR. 9. Only required along public streets. 10. Increased to 10 feet if adjacent to residential uses or non-TSO zoning. B. The landscape perimeter may be averaged if the total required square footage is achieved, unless the landscaping requirement has been increased due to proximity to LDR, MDR or HDR. Landscape perimeter averaging may be allowed as a Type 2 special permission decision if all of the following criteria are met: 1. Plant material can be clustered to more effectively screen parking areas and blank building walls. 2. Perimeter averaging enables significant trees or existing built features to be retained. 3. Perimeter averaging is used to reduce the number of driveways and curb cuts and allow joint use of parking facilities between neighboring businesses. 4. Width of the perimeter landscaping is not reduced to the point that activities on the site become a nuisance to neighbors. 5. Averaging does not diminish the quality of the site landscape as a whole. (Ord. 2442 §1, 2014; Ord. 2251 §61, 2009; Ord. 2235 §13, 2009; Ord. 1872 §14 (part), 1999) 18.52.030 Perimeter Landscape Types A. Type llandscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a Tight visual separation between uses and zoning districts, screen parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 30 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 7 lineal feet of required perimeter excluding curb cuts or a planted berm at least 24 inches high; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type I landscape perimeter, provided that the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided that public safety is not compromised. B. Type 11 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a moderate visual separation between uses and zoning districts, screen blank building walls and parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 20 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 5 lineal feet of required perimeter excluding curb cuts; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type II landscape perimeter, provided that the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided that public safety is not compromised. C. Type III landscape perimeter. 1. Purpose is to provide extensive visual separation between industrial areas and nearby residential areas. 2. Plant materials shall consist of the following: a. One tree per 20 lineal feet of required perimeter excluding curb cuts; and b. Shrubs to provide a solid planting screen with a height of five to eight feet or a solid wooden fence or masonry wall to be approved by the Community Development Director; and c. Living groundcover to cover 90% of the landscape area within three years. D. Plant material requirements. 1. Plants shall meet the current American Standard for Nursery Stock (American Nursery and Landscape Association — ANLA), and shall be healthy, vigorous and well - formed, with well -developed, fibrous root systems, free from dead branches or roots. Plants shall be free from damage caused by temperature extremes, lack of or excess moisture, insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good color. Plants shall be habituated to outdoor environmental conditions (hardened -off). 2. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 3. Deciduous trees shall be used to allow visual access to entryways, signage and pedestrian use areas. 4. Evergreen shrubs shall be used to screen parking lots along street frontages. 5. In perimeters located adjacent to residential zones 75% of trees and shrubs shall be evergreen. 6. Evergreen trees shall be a minimum of 6 feet in height at time of planting. 7. Deciduous trees shall have at least a 2 inch caliper at time of planting, determined according to the American Standard for Nursery Stock. 8. Shrubs shall be at least 18 inches in height at time of planting. 9. No plants listed on the current King County Noxious Weed list may be used. 10. Existing vegetation may be used to meet the requirements of this chapter. All significant trees located within any required perimeter landscaping area which are not dead, dying, or diseased and which do not pose a safety hazard as determined by the Community Development Director shall be retained. 31 11. The classification of plant material as trees, shrubs and evergreens shall be as listed in the Hortus Third, A Concise Dictionary of Plants Cultivated in the U.S. and Canada. 12. Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant list. (Ord. 2251 §62, 2009; Ord. 1872 §14 (part), 1999) 18.52.035 Interior Parking Lot Landscaping Requirements Landscaping within parking areas shall be provided as shown below. 1. Requirements for each distinctly separate parking area within the LDR zone for uses other than dwelling units, and in the MDR and HDR zones: a. For areas with up to 20 parking stalls per parking area, no interior landscaping is required. b. For areas with 21 - 40 parking stalls per parking area, 7 square feet of interior landscape area is required for each parking stall. c. For areas with more than 40 parking stalls per parking area, 12 square feet of interior landscape area is required for each parking stall (see Multi -Family Design Guidelines, Site Planning Section, No. 31, for the normal 15 square feet to be provided). d. All parking areas shall have a perimeter landscape strip a minimum of 2 feet wide with an average width of 5 feet. 2. Requirements for parking lots within the 0, MUO, RCC, and NCC zones: a. For lots with up to 20 parking stalls, no interior landscaping is required. b. For lots with 21 - 40 parking stalls, a minimum of 10 square feet of interior landscape area is required for each parking stall over 20. c. For lots with more than 40 parking stalls, a minimum of 200 square feet of interior landscape area plus 15 square feet for each parking stall over 40 is required. For areas placed behind buildings or otherwise screened from streets, parks and City trails the interior landscape requirement is reduced to a minimum of 200 square feet plus 10 square feet for each parking stall over 40. 3. Requirements for parking lots within the RC, RCM, C/LI, ISO and TVS zones: a. For areas adjacent to public or private streets, a minimum of 15 square feet of landscaping is required for each parking stall. b. For areas placed behind buildings or otherwise screened from streets, parks and City trails a minimum of 10 square feet of interior landscape area is required for each parking stall. 4. Planting Standards: a. Interior landscape islands shall be distributed to break up expanses of paving. Landscaped areas shall be placed at the ends of each interior row in the parking area, with no stall more than 10 stalls or 100 feet from a landscape area. Landscaped areas and planting islands may contain bioretention. b. The minimum size for interior parking lot planting islands is 100 square feet. c. Planting islands shall be a minimum of 6 feet in any direction and generally the length of the adjacent parking space. d. Raised curbs or curb stops shall be used around the landscape islands to prevent plant material from being struck by automobiles. Where bioretention is used, curb cuts shall be placed to allow stormwater runoff from adiacent pavements to enter the bioretention system. e. A minimum of 1 evergreen or deciduous tree is required per landscape island, with the remaining area to contain a combination of shrubs, living groundcover and mulch. (Ord. 2442 §2, 2014; Ord. 2251 §63, 2009; Ord. 2235 §14, 2009; Ord. 1872 §14 (part), 1999) 18.52.050 Landscape Plan Requirements A. A Washington State licensed landscape architect shall prepare and stamp the landscape plans in accordance with the standards herein. Detailed plans for landscaping and screening shall be submitted with plans for building and site improvements. Included in the plans shall be type, quantity, spacing and location of plants and materials, site preparation and specifications for soils and mulches, location of all overhead and underground utilities (so as to avoid conflicts with proposed planting locations), typical planting details and the location of irrigation systems. B. Installation of the landscaping and screening shall be completed and a Landscaping Declaration submitted by the owner or owner's agent prior to issuance of the certificate of occupancy. If necessary, due to weather conditions or construction scheduling, the installation may be postponed to the next planting season if approved by the Community Development Director and stated on the building permit. A performance assurance device equal to 150% of the cost of the labor and materials must be provided to the City before the deferral is approved. The property owner shall keep all planting areas free of weeds and trash and replace any unhealthy or dead plant materials for the life of the project in conformance with the intent of the approved landscape plan and TMC Section 8.28.180. Any landscaping required by this chapter shall be retained and maintained for the life of the project. Additionally, topping or removal of required trees is prohibited. Only trees that pose a danger or are diseased, as determined by an ISA certified arborist, shall be allowed to be removed. Any illegal removal of required trees shall be subject to obtaining a tree permit and replacement with trees that meet or exceed the functional value of the removed trees. C. Landscape Plans that include a bioretention facility shall be submitted to the Public Works Director in addition to the Community Development Director. 32 \ (Ord. 2368 §53, 2012; Ord. 2251 §65, 2009; CHAPTER 18.56 Ord. 1971 §19, 2001; Ord. 1872 §14 (part), 1999) OFF-STREET PARKING AND LOADING REGULATIONS 18.56.040 General Requirements Any required off-street parking and loading facilities shall be developed in accordance with the following standards: 1. Location. Any on -premises parking area which contains parking stalls located more than 1,000 feet from the principal use shall require Board of Architectural Review approval for the entire parking lot. 2. MINIMUM PARKING. Minimum parking area dimensions for surface and structured parking facilities shall be as provided in Figure 18-6. Standard and compact parking stalls shall be allowed a two -foot landscaping overhang to count towards the stall length. 3. TANDEM PARKING SPACES. In the MDR and HDR zones, tandem spaces (where one car is parked directly behind another) will be allowed for each three bedroom and 1/3 of all two bedroom units. No more than 1/3 of all project parking spaces may be tandem and all tandem parking spaces will be designed for full size rather than compact size vehicles based on the dimensions in Figure 18-6. 4. PARKING AREA AND PARKING AREA ENTRANCE AND EXIT SLOPES. The slope of off-street parking spaces shall not exceed 5%. The slope of entrance and exit driveways providing access for off-street parking areas and internal driveway aisles without parking stalls shall not exceed 15%. 5. DRIVEWAYS AND MANEUVERABILITY. a. Adequate ingress to and egress from each parking space shall be provided without moving another vehicle and without backing more than 50 feet. b. Turning and maneuvering space shall be located entirely on private property unless specifically approved by the Public Works Director and the Board of Architectural Review. c. All parking spaces shall be internally accessible to one another without reentering adjoining public streets. d. When off-street parking is provided in the rear of a building and a driveway or lane alongside the building provides access to rear parking area, such driveway shall require a minimum width of twelve feet and a sidewalk of at least a three-foot section, adjoining the building, curbed or raised six inches above the driveway surface. e. Ingress and egress to any off-street parking lot shall not be located closer than 20 feet from point of tangent to an intersection. f. The Public Works Director or the Community Development Director may require ingress separate from an egress for smoother and safer flow of traffic. 6. The Director may require areas not designed or approved for parking to be appropriately marked and/or signed to prevent parking. 7. SURFACE. 33 a. The surface of any required off-street parking or loading facility shall be paved with asphalt, concrete or other similar approved material (s) and shall be graded and drained as to dispose of all surface water, but not across sidewalks. b. All traffic -control devices, such as parking stripes designating car stalls, directional arrows or signs, bull rails, curbs and other developments shall be installed and completed as shown on the approved plans. c. Paved parking areas shall use paint or similar devices to delineate car stalls and direction of traffic. d. Where pedestrian walks are used in parking lots for the use of foot traffic only, they shall be curbed or raised six inches above the lot surface. e. Wheel stops shall be required on the periphery of parking Tots so cars will not protrude into the public right-of-way, walkways, off the parking lot or strike buildings. Wheel stops shall be two feet from the end of the stall of head -in parking. f. The use of permeable pavement is the preferred material for parking surfaces, and any parking stalls provided in excess of the required minimum required off-street parking spaces shall use permeable pavement where technically feasible in accordance with the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30. 8. PARALLEL PARKING STALLS. Parallel parking stalls shall be designed so that doors of vehicles do not open onto the public right-of-way. 9. OBSTRUCTIONS. No obstruction which would restrict car door opening shall be permitted within five feet of the centerline of a parking space. 10. LIGHTING. Any lighting on a parking lot shall illuminate only the parking lot, designed to avoid undue glare or reflection on adjoining premises. 11. CURB -CUTS. All parking areas shall have specific entrance and/or exit areas to the street. The width of access roads and curb -cuts shall be determined by the Public Works Director. The edge of the curb -cut or access road shall be as required by the Public Works Director for safe movement of vehicles or pedestrians. Curb -cuts in single- family districts shall be limited to a maximum of 20 feet in width and the location shall be approved by the Public Works Director. 12. PARKING STALL. Parking stalls shall not be used for permanent or semi -permanent parking or storage of trucks or materials. (Ord. 2368 §54, 2012; Ord. 2251 §66, 2009; Ord. 1795 §3 (part), 1997; Ord. 1758 §1(part), 1995) 34 Off -Street Parking Area Dimensions TMC 18.56.040 A B C D E F Parking Angle Stall Width Stall Depth Aisle Width Curb Length Unit Width 1-way traffic 2-way traffic 1-way traffic 2-way traffic 0° 8* 8* 12 20 20* 28* 36* 8.5 8.5 12 20 23 29 37 30° 8* 8.5 9 15* 17 17.5 11 11 11 20 20 20 16* 17 18 41* 45 46 54* 54 55 9.5 18 11 20 10 47 56 45° 8* 8.5 9 17* 19.5 20 12.5 12.5 12 20 20 20 11.5* 12 12.7 46.5* 51.5 52 54* 59 60 9.5 20 12 20 13.4 52 60 60° 8* 8.5 9 18* 21 21 21 17.5* 17.5 17 20 20 20 9.2* 9.8 10.4 53.5 59.5 59 56* 62 62 9.5 16.5 20 11 58.5 62 90° 8* 8.5 9 9.5 16* 19 19 19 24 24 23 25 25 24 24 8* 8,5 9 56* 62 61 57* 63 62 22 9.5 60 62 *These figures are for use with compact cars on y. Any bays that contain combined compact and normal spaces shall be designed for normal spaces. Curb Length (E) Aisle (D) stall width or depth (B or C) 1 Aisle or Street Unit Width (F) Angled Parking Parallel Parking Figure 18-6 Off -Street Parking Area Dimensions 35 Table 18.3 District Standards: Regional Corridor District Standards Center TOD Pond District Comm. Workplace 18.28.070 Structure Height' Minimum Height Maximum Height without Incentives Frontal Improvement Height Incentive Multi -Family Height Incentive Structured Parking Height Incentive 25 ft fronting Baker BI. 85 ft 115 ft, or 214 ft w/in 300 ft of Tukwila Pkwy & Southcenter Pkwy 25 ft fronting Baker BI. 45ft 70ft, 115'if combined with MF, LEED, Structured Parking or Affordable Housing Incentive n/a 45 ft 70 ft, no increase w/in 150 ft of Pond edge n/a 45 ft n/a 45 ft n/a n/a 115ft,or214ft w/in 300 ft of Tukwila Pkwy & Southcenter Pkwy 115ft,or214ft w/in 300 ft of Tukwila Pkwy & Southcenter Pkwy 70ft,115'if combined with 70 ft, no increase Frontal Imp., w/in LEED, Structured 150 ft of Pond Parking or edge Affordable Housing Incentive 70 ft,115' if combined with 70 ft, no increase Frontal Imp., MF, w/in LEED or I 150 ft of Pond Affordable Housing edge Incentive n/a 70 ft River adjacent parcels only 18.28.080 Maximum Block Face Length Provision of New Streets 850 ft max2 700 ft max 700 ft max - 900 ft max 900 ft max 18.28.090 Permitted Corridor Types for New Streets Pedestrian Corridor permitted permitted Walkable Corridor permitted permitted Neighborhood Corridor permitted permitted permitted permitted3 Urban Corridor permitted permitted permitted Commercial Corridor permitted permitted Workplace Corridor permitted permitted Tukwila Pond Esplanade permitted Pedestrian Walkway permitted 18.28.100 Side and Rear Setbacks Side and Rear Yards 5 ft4 5 ft4 5 ft4 5ft 5 ft 18.28.110 Side and Rear Landscaping Requirements Side and Rear Yards 18.28.220 Special Corner Feature Special Corner Feature on Building 5ft4 5ft4 5ft4 permitted permitted permitted Oft Oft 1) Portions of the building that extend above the primary building mass, such as non -habitable space (clock towers, roof -top cupolas, elevator and mechanical equipment enclosures), unenclosed space (roof deck trellises, gazebos), and other special architectural features, shall not exceed the maximum height requirement by more than 20 feet, provided they are set back a minimum of 10 feet from the edge of the roof (see also TMC 18.50.080). 2) Does not apply to Freeway Frontage Corridors 3) Permitted adjacent to residential uses. 4) May be waived as part of design review if Building and Fire Code requirements are met. 36 STATE OF WASHIt4GTO DEPARTMENT OF COMMERCE 1011 Plum Street SE • P© Box 42525 • Olympia. Was htrgron 98504-2525 • (360)725-4000 v.r.mcornmerce.:*.a.goi September 12, 2016 Moira Carr Bradshaw Senior Planner City of Tukwila 6200 Southcenter Boulevard Tukwila , Washington 98188 Dear Ms. Carr Bradshaw: Thank you for sending the Washington State Department of Commerce (Commerce) the following materials as required under RCW 36.70A.106. Please keep this letter as documentation that you have met this procedural requirement. City of Tukwila - Proposed amendments to the City's development regulations (Tukwila Municipal Code 14, 16 and 18) are to modify the existing standards for drainage review and design of development projects and institute best management practices for controlling pollution from potentially pollution -generating activities. The changes are intended to: 1. Provide better protection of environmental resources and private property, and 2. Meet the intent of requirements of the GMA, the Clean Water Act and Tukwila's Municipal Stormwater permit. The proposed changes adopt King County's new Surface Water Design Manual and incorporate low impact development standards throughout the City's development regulations. These materials were received on September 09, 2016 and processed with the material ID # 22834. Expedited Review is requested under RCW 36.70A.106(3)(b). If this submitted material is an adopted amendment, then please keep this letter as documentation that you have met the procedural requirement under RCW 36.70A.106. If you have submitted this material as a draft amendment requesting expedited review, then we have forwarded a copy of this notice to other state agencies for expedited review and comment. If one or more state agencies indicate that they will be commenting, then Commerce may deny expedited review and the standard 60-day review period will end on November 08, 2016. Commerce will notify you by e-mail regarding of approval or denial of your expedited review request. If approved for expedited review, then final adoption may occur no earlier than September 23, 2016. Please remember to submit the final adopted amendment to Commerce within ten (10) days of adoption. If you have any questions, please contact Growth Management Services at reviewteam@commerce.wa.gov, or call Dave Andersen (509) 434-4491. Sincerely, Review Team Growth Management Services l \ Department of Commerce innovedo...:ES our nature. Notice of Proposed Amendment Request for Expedited Review Pursuant to RCW 36.70A.106(3)(b), the following jurisdiction provides notice of a proposed development regulation amendment and requests expedited state agency review under the Growth Management Act. Under statute, proposed amendments to comprehensive plans are not eligible for expedited review. The expedited review period is 10 business days (14 calendar days). (If needed, you may expand this form and the fields below, but please try to keep the entire form under two pages in length.) Jurisdiction: City of Tukwila Mailing Address: 6300 Southcenter Blvd Ste. 100 Tukwila WA 98188 Date: September 9, 2016 Contact Name: Moira Carr Bradshaw Title/Position: Senior Planner Phone Number: 206-431-3651 E-mail Address: Moira.bradshaw@tukwilawa.gov Brief Description of the Proposed/Draft Development Regulations Amendment: (40 words or less) The proposed amendments to the City's development regulations (Tukwila Municipal Code 14, 16 and 18) are to modify the existing standards for drainage review and design of development projects and institute best management practices for controlNing pollution from potentially pollution —generating activities. The changes are intended to: 1. Provide better protection of environmental resources and private property, and 2. Meet the intent of requirements of the GMA, the Clean Water Act and Tukwila's Municipal Stormwater permit. The proposed changes adopt King County's new Surface Water Design Manual and incorporate low impact development standards throughout the City's development regulations Rev 03/2015 Is this action part of the scheduled review and update? GMA requires review every 8 years under RCW 36.70A.130(4)-(6). Yes. No: X Public Hearing Date: Planning Board/Commission: October 27, 2016 Council/County Commission: November 14, 2016 Proposed Adoption Date: November 21, 2016 REQUIRED: Attach or include a copy the proposed amendment text or document(s). We do not accept a website hyperlink requiring us to retrieve external documents. Jurisdictions must submit the actual document(s) to Commerce. If you experience difficulty, please contact reviewteam@commerce.wa.gov. Rev 03/2015 Moira Bradshaw From: Don Tomaso Sent: Thursday, September 01, 2016 6:15 PM To: Moira Bradshaw Subject: RE: Low Impact Development Surface Water Design Amendments Greg had them incorporated already and they remained the same in this draft. Don From: Moira Bradshaw Sent: Thursday, September 01, 2016 9:36 AM To: Don Tomaso Subject: RE: Low Impact Development Surface Water Design Amendments Thanks Don — any comments? m From: Don Tomaso Sent: Wednesday, August 31, 2016 6:26 PM To: Moira Bradshaw; Jerry Hight; Laurie Werle Cc: Greg Villanueva Subject: RE: Low Impact Development Surface Water Design Amendments Done! Don From: Moira Bradshaw Sent: Wednesday, August 17, 2016 5:30 PM To: Jerry Hight; Laurie Werle; Don Tomaso Cc: Greg Villanueva Subject: Low Impact Development Surface Water Design Amendments Jerry, Laurie and Don — Attached is a "land use routing form" for the SEPA File E16-0008. The City needs to make a SEPA Determination on the proposed TMC changes, which are linked below. The SEPA checklist is also linked below. Z:\DCD & PW\Low Impact Dev\SEPA\SEPA Application for LID Package\Amended Tukwila Development Code Draft FINAL.pdf Z:\DCD & PW\Low Impact Dev\SEPA\SEPA Application for LID Package\Amended IDCS Draft FINAL.pdf Z:\DCD & PW\Low Impact Dev\SEPA\SEPA Application for LID Package\SEPA Application for LID.pdf Z:\DCD & PW\Low Impact Dev\SEPA\SEPA Application for LID Package\New Tukwila Street Tree List Draft FINAL.pdf Z:\DCD & PW\Low Impact Dev\SEPA\SEPA Application for LID Package\New Tukwila Bioretention Plant List Draft FINAL.pdf 1 If you have any difficulty accessing the information or understanding the process please contact me and I will see about getting you a hard copy of the info and reviewing the proposed actions. I will be putting a hard copy of the routing form in your boxes as a physical reminder of the action and time frame. Here is a link to the Notice of application that is being circulated to other agencies and the public: Z:\DCD & PW\Low Impact Dev\SEPA\E16-0008 Notice of Application.doc Thanks, Moira Carr Bradshaw Senior Planner Community Development Department 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 (206) 4313651 T, Th 8:30-5:00; W 8:00-12:00 2 ram• Goal of LID • Urban Landscape More Like Pre -Development Hydrology Example (Less Runoff) Replicating Natural HydrologicProcesses To Manage Stormwater O liilYM ,n uvm.0 :a[ lu .•rr. 5:or roue- MC l. . secR ca.tnrnent--:. Y,d R tg.h.,clet to _ LID Integmtetl inIo Redeveloprnent r,:,il Col V,m!t LID I�wiE,ci _ = t olvetwat.'v te 1n.ngtt ell•.rmn_ -.. INF! LTRA r1UN 5IIAM3ERS lnfdl rjtlon [Stream -i�Mn fl� ita a„a+r4r. 'It,114.tO i3ilei . VA- . Jr.Med MealaVi TRANSITION srtnrxl hrtoms (2.W.1, . fln.�Mveflk STREAM BUFFED tnuno.rw x e. tiTet.T. oYp!fC'�S IIM-C.aC4 =__ Miller Creek 0 STREAM Design for Miller Creek, Burien NERA, Otak, Inc. 8 Co TO Update City Codes and Standards 28 Ft Street T „. , e•a.i .�w1 Parking on both sides A -.. � 24 Ft Street Parking on ane side Burien 2008 Rood Design and Construction Standards coke Conventional LID For example: Standard Streets and Commercial Developments 12 r 1 / '; INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS iron CHAPTER 2 DEVELOPMENT GUIDELINES AUG 1 6 2016 Com1rnunity Ceve;oP e-at SECTION 2.0 ERRORS AND OMISSIONS At the Director's discretion, any significant error or omission in the approved plans, or information used as a basis for approval, will constitute grounds for withdrawal of any permit approvals and/or stoppage of any or all of the permitted work. The Permittee shall show cause why such work should continue and make such changes in plans as required by the Director. SECTION 2.1 PERMITS Prior to beginning multifamily -residential, commercial, or industrial development, or development requiring construction of public infrastructure within the City, the Applicant shall submit a permit application, plans, and specifications to the Permit Center for review and approval by the Public Works Department. Development design and construction shall meet all of the applicable standards, codes, and recommendations in specific reports, such as the geotechnical report, the traffic impact analysis, and the surface water Technical Information Report. Depending on particular project elements, the Director may require submittals in addition to those described in this chapter. Any significant changes to the approved plans or specifications of a permitted project require a REVISION submittal to the City for approval. TYPE A SHORT-TERM NONPROFIT Issued for 72 hours to nonprofit organizations for assemblies, bike races, block parties, parades, parking, processions, non -motorized vehicle races, street dances, street runs. TYPE B SHORT-TERM PROFIT Issued for 72 hours to for -profit entities for fairs, house moves, sales, street closure. TYPE C CONSTRUCTION Issued for 180 days for activities in the right-of-way and on private property. These activities include sewer, water, surface water, grading, street improvements, boring, culverts, curb cuts, paving, driveways, Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 1 (INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS fences, landscaping, painting/striping, sidewalks, trenching, utility installation/repair, traffic signals and illumination. TYPE C RIGHT-OF-WAY Issued for 180 days for activities that will disturb the right-of-way, including boring, installation of culverts, curb cuts, and public facilities, paving, landscaping, and trenching. TYPE C GRADING Issued for 180 days for all grading activities occurring within the City limits except the following: 1. Excavation for construction of a structure permitted under the International Building Code; 2. Cemetery graves; 3. Refuse disposal sites controlled by other regulations; 4. Excavations for wells, or trenches for utilities; 5. Mining, quarrying, excavating, processing or stockpiling rock, sand, gravel, aggregate or clay controlled by other regulations, provided such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties; 6. Exploratory excavations performed under the direction of a registered design professional, as long as this exploratory excavation does not constitute the beginning of construction of a building prior to obtaining a permit. TYPE D LONG-TERM Issued for periods greater than 72 hours for activities which do not disturb the right-of-way including: air rights, bus shelters, access to construction sites, loading zones, newspaper sales, recycling facilities, sales structures, sidewalk cafes, awnings, benches etc, underground rights, utility facilities, waste facilities. TYPE E POTENTIAL DISTURBANCE Issued for 180 days for activities having a potential to disturb the right-of- way, such as hauling 6 loaded vehicles/hr/8 hr day for 2 or more consecutive days, hauling hazardous waste as defined in the Revised Code of Washington, or surveying (other than for a Tukwila capital improvement project). Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 2 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS TYPE F BLANKET Issued for 365 days to telecommunications and cable franchisee, and utilities for connections, repairs, and emergencies. FLOOD ZONE Any construction or development within any special flood hazard area, including manufactured homes, watercourse alteration, excavation, fill, requires a Flood Zone Control permit (FZCP). An FZCP grants approval to construct or develop within a special hazard area, a flood -prone area or the shoreline, but does not replace the need for additional permits such as a building permit or a Type C Construction permit. A permit shall be obtained before construction or development begins within any area of special flood hazard established in TMC 16.52.050. The permit shall be for all structures including manufactured homes, and for all development including fill and other activities. WATER METER - PERMANENT Issued for domestic water supply of all new or reestablished services when sewer discharge rates are calculated based on water usage. Each individual building requires a separate water main tap. The fee includes a City -provided water meter. WATER METER - WATER ONLY Issued for a separate service from the main for water that will not discharge to the public sewer. The fee includes a City -provided water meter. WATER METER - DEDUCT Required to meter water that will not discharge to the public sewer. The Permittee provides, owns, installs, and maintains the meter. This meter is installed downstream of a permanent water meter. An example is landscape irrigation. WATER METER - TEMPORARY Required for use of public water, on a short-term basis, where a metered supply does not already exist. The Permittee rents the meter from the City. Examples include dust suppression during construction or water supply during hydroseeding. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 3 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDAIRDS SECTION 2.2 FEES 2.2.1 PERMIT Public Works establishes and collects fees as set forth in the fee schedule adopted by the City Council. Most of the permit fees are flat rates that are due when the permit is issued. Type C permit fees are based on the estimated construction value of the public works elements in a project. For Type C permits, Public Works collects an Application and Plan Review Fee when the application is submitted and a Permit Issuance and Inspection fee when the permit is issued. After the permit is issued, Public Works may assess additional fees for revisions and inspections and may adjust pavement mitigation fees. Any additional fees must be paid before the PUBLIC WORKS Final Inspection occurs. Public Works charges 25% of the Total Plan Review Fee for each additional review, which is attributable to the Applicant's action or inaction. Each revision to approved plans is charged 25% of the Issuance and Inspection fee. Each re -inspection after the first two inspections is charged $60.00/inspection per inspection item. Refer to Public Works Bulletin for permit fee estimates. 2.2.2 PAVEMENT MITIGATION The City calculates the square footage used to determine a mitigation fee according to the following: A. For repairs requiring an overlay, the City uses the total square feet of overlay. B. For pavement repair, the City uses the cut area plus two feet on each side of the cut. Public Works may adjust this fee when the actual field measurements differ from the proposed measurements shown on the permit application. Any adjustment to the mitigation fees must be completed before the Public Works Final Inspection. Refer to Public Works Customer Assistance Bulletins for a more complete description of Pavement Mitigation fees. 2.2.3 TRANSPORTATION IMPACT FEES Consistent with the Comprehensive Plan, the Six -year Transportation Plan and the Capital Improvement Plan, transportation impact fees help ensure that new development bears its proportionate fair share of Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 4 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS transportation facilities necessitated by the new development. The fee applies to any construction, reconstruction, conversion, structural alteration, relocation or enlargement of any structure that requires a building permit and generates any new PM peak hour trips. The transportation impact fee is charged to each development according to an impact fee schedule based on defined zones. The fees are assessed as part of the building permit and are due and payable when the permit is issued (TMC 9.48 and Ordinance 211). 2.2.4 INDEPENDENT REVIEW Depending on the site conditions and design complexity, reports submitted to the City may receive independent review. The Applicant pays the review fee. 2.2.5 CONNECTION CHARGES Some City water and sewer services have special connection charges. When these charges apply, the Applicant shall provide a legal description of the property to aid in calculating the charges. 2.2.6 CAPACITY CHARGES King County Metro determines the sanitary sewer capacity charge based on the information provided on the Sewer Use Certification form. For new construction within the City's service area and for all tenant improvements within the city limits, the Applicant submits a completed Sewer Use Certification form. This form is available in Public Works. Upon completion of the project work, Public Works forwards the completed form to Metro. 2.2.7 OVERTIME FEES Inspections that occur during non -regular business hours are subject to "after hours" inspection fees. The Director determines when these inspections are allowed. The fees are charged at the inspector's overtime -hourly rate and include vehicle, overhead, and expense charges. 2.2.8 SPECIAL BILLING FEES The City shall charge for any work or services provided by Public Works, such as traffic control or utility relocation, which occurs under an Authorization for Special Billing or provided by Public Works as a response to infrastructure damage during construction. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 5 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS SECTION 2.3 SUBMITTALS 2.3.1 PLANS Plans submitted to Public Works for review and approval, except for single family residences that are not in or adjacent to a sensitive area and that do not trigger surface water drainage review, shall be prepared, signed, stamped, and dated by a Washington State registered Professional Engineer. These plans must be submitted to the City for plan review and approval prior to the commencement of any construction. Public Works will review all submittals for compliance with these Standards. Plan approval does not relieve the Applicant, the Applicant's Engineer, or the Contractor from responsibility for ensuring that all facilities are safe and that calculations, plans, specifications, construction drawings, record drawings, and as -built information complies with normal engineering standards, these Standards, and applicable federal, state, and local laws and codes. Refer to Appendix C for a plan completeness checklist. 2.3.2 SPECIFICATIONS Specifications shall be submitted with the plans, when the plans and notes do not adequately describe the proposed work and materials. 2.3.3 PLAN CHECKLIST A completed Plan Checklist may be submitted with the plans. The engineer should use the Plan Checklist to ensure the plans meet the specific minimum requirements. A Plan Checklist is included as Appendix C. 2.3.4 EROSION PREVENTION AND SEDIMENT CONTROL PLAN Any project that will clear, grade, or otherwise disturb a site must provide erosion prevention and sediment controls to prevent, as much as possible, sediment transportation offsite to downstream drainage facilities and water resources, or onto other properties. The erosion prevention and sediment control plan shall meet or exceed the standards in the adopted King County Surface Water Design Manual. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 6 r� f'� INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2.3.5 POLLUTION PREVENTION PLAN Any construction project that includes any of the following activities must provide best management practices to prevent pollution: A. Dewatering B. Paving C. Structure construction and painting D. Material delivery, use, or storage (soil, pesticides, herbicides, fertilizers, detergent, plaster, petroleum products, acids, lime, paints, solvents, curing compounds) E. Solid waste F. Hazardous waste G. Contaminated soils H. Concrete waste I. Sanitary/septic waste J. Vehicle or equipment cleaning, fueling, or maintenance 2.3.6 PROJECT SCHEDULE The project schedule shall include the proposed sequence and expected start and end dates for all major activities. The schedule shall include installation of temporary and permanent erosion prevention and sediment control measures and schedules for monitoring, operation, and maintenance of these measures. 2.3.7 WORK IN RIGHT-OF-WAY Required permit application submittals when proposing work within City right-of-way include the following (TMC > Los): A. Applicant/Owner information 1. Applicant name, address, phone number, email address 2. Owner name, address, phone number (if not the Applicant) B. Activity Description 1. Cut and fill volumes 2. Location 3. Proposed use 4. Excavation method and areas, surface and subsurface 5. Restoration method 6. Start and end dates and expected duration C. Plans, profiles, cross sections D. Copy of franchise agreement, easement, encroachment permit, license or other legal authorization Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 7 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS E. Document from Owner and Applicant saying they are in compliance F. Hold Harmless Agreement G. Traffic control plan H. City of Tukwila business license I. Copy of the contractor estimate or engineer estimate for the activity being permitted. Public Works will review and may adjust. Any fee adjustment will be made when the permit is issued J. Application fee K. Comprehensive general liability insurance with limits not less than $2,000,000, naming City of Tukwila as additional insured L. Business automobile liability insurance with limits not less than $1,000,000 M. Contractor's pollution liability insurance, on an occurrence form, with limits not Tess than $1,000,000 each occurrence and deductible not more than $25,000 N. Corporate surety bond, cash deposit or letter of credit for 150% of the value of the right-of-way work to be done, in order to guarantee faithful performance of the permitted work O. Maintenance Bond - Two years - minimum 10% of construction costs 2.3.8 TECHNICAL INFORMATION REPORT (SURFACE WATER) The scope of drainage review varies with the project complexity and potential surface water impacts. Refer to the adopted King County Surface Water Design Manual to determine Technical Information Report and design requirements appropriate for the project. 2.3.9 GEOTECHNICAL REPORT A geotechnical report helps determine if the proposal for a site is appropriate. A geotechnical report contains information used to design retaining walls, foundations, permeable pavements, hazardous waste facilities, and infiltration systems, such as trench drains, sand filters and septic drain fields. Geotechnical reports also supply information for settlement analysis, liquefaction, structural fill, and storm water design. The report shall meet the City's current sensitive area, Public Works, and Uniform Building Code requirements. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 8 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS The City may require a geotechnical investigation and report based on the nature of the proposal. All of the following require a geotechnical investigation and report prepared by a Geotechnical Engineer. A. Unless waived by the Building Official: 1. All new buildings except a residential structure that falls under the International Residential Code 2. Any structure, including a rockery, that retains a surcharge 3. Any retaining structure, including a rockery, that is over four feet above existing grade 4. Grease interceptors that are 1000 gallons or larger 5. Surface water retention/detention structures, including bioretention and permeable pavements B. Unless waived by the Department of Community Development Director: 1. Any work on sites containing or adjacent to slopes that are 15% or steeper 2. Grading that requires environmental review under the State Environmental Policy Act C. Unless waived by the Public Works Director 1. Surface water infiltration, including bioretention and permeable pavements 2. Riverbank Stability (Ordinance 2038) 3. Hazardous Waste Facility Design The reporting requirements for single-family permits may be waived, if a report for the site meeting the City of Tukwila's criteria has been filed Tess than five years before the date of application and the Geotechnical Engineer who signed the report prepares a written letter stating the report is still applicable to the site and currently proposed project. Similarly, reporting requirements may be waived for single- family permits if the applicant can demonstrate, to the City's satisfaction, that soil or groundwater conditions at or near the site pose little or no risk. 2.3.10 TRAFFIC CONTROL PLAN Prior to beginning any activity which might affect City right-of-way, the Applicant/Permittee shall provide the City, for review and approval, a traffic control plan that meets MUTCD standards. The traffic control plan shall accurately reflect existing site conditions including accesses, channelization, sidewalks, bike/pedestrian paths, bus stops and such. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 9 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS The Applicant must provide the location, address and description of expected traffic flow during the proposed work. 2.3.11 RIVERBANK STABILITY ANALYSIS As part of the Flood Control Zone permit application, the Applicant must provide a riverbank stability analysis for projects adjacent to the Green/Duwamish River, whenever the natural riverbank is expected to provide bank protection for the life of the project. A geotechnical engineer must prepare the analysis. The geotechnical engineer must certify that the riverbank is stable for the lifetime of the proposed project. The analysis scope will vary with the site conditions. All elevations shall use the same datum as the FZCP submittal. The analysis report shall include assessment of current conditions, conclusions, and construction recommendations. At a minimum, the report shall include: A. Site map showing location of riverbank cross -sections, structures, roads, drainage, wells, septic tanks, utilities, and other significant features at the project site. B. Riverbank cross -sections at intervals sufficient to provide accurate detail for analysis. Cross sections should show the top -of -bank, grade -breaks, toe -of -bank, and, whenever feasible, streambed geometry. C. Soil strength and erodability parameters, current slope stability and expected slope stability during rapid drawdown, including factors of safety. Provide possible failure modes and failure causes. D. Discussion of risk and possible environmental effects, both locally and downstream. E. Prevention measures, repair and monitoring requirements. 2.3.12 SANITARY SEWER Your project may require submittal of any of the following: A. King County Sewer Use Certification form for new or modified facilities, B. South King County Health Department septic system approval for construction on a site having a septic tank, C. Copy of King County Industrial Waste Discharge approval for gas stations and some industrial operations that discharge to a sanitary sewer, Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 10 r � INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS D. Septic tank abandonment documentation, E. Copy of King County Department of Natural Resources approval for direct side sewer connection to interceptor lines. 2.3.13 FINANCIAL GUARANTEE A. For work in the right-of-way Applicant shall provide: 1. A corporate surety bond, cash deposit or letter of credit for 150% of the value of the proposed right-of-way work, in order to guarantee faithful performance of the permitted work. 2. A corporate surety bond, cash deposit or letter of credit for 10% (minimum) of the value of the right-of-way work, to guarantee workmanship and materials for two years following completion of work. B. For hauling, the applicant shall provide a $2,000 financial guarantee to assure clean up and repair of any damage. C. For moving an oversize Toad, the applicant shall provide a $5,000 financial guarantee to assure repair of any damage. D. For the Public Works part of a subdivision, short plat, or projects containing or abutting sensitive areas, the Owner shall provide a corporate surety bond, cash deposit or letter of credit for 150% of the total cost of the proposed work to guarantee performance of proposed work. E. For street lighting as part of subdivision, the Owner shall provide a two-year financial guarantee for 150% of the cost of the illumination for maintenance. (TMC 11.12.110) F. The Director may require a financial guarantee for 10% of the project costs for erosion prevention and sediment control on projects which clear more than 6000 square feet or contain or abut sensitive areas such as Class 2 or steeper slopes, wetlands, or critical drainage. 2.3.14 INSURANCE A. Permittee performing work within City right-of-way shall provide proof of the following insurance, showing the City as additional insured: 1. Comprehensive general liability insurance with limits not less than $2,000,000. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 11 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2. Business automobile liability insurance with limits not less than $1,000,000. 3. Contractor's pollution liability insurance, on an occurrence form, with limits not less than $1,000,000 each occurrence and deductible not more than $25,000. B. If the Director determines the nature of any work is such that it may create a hazard to human life, endanger adjoining property, street, street improvement, or any other public property, the Director may require the applicant to file a certificate of insurance. The Director, based on the nature of the risks involved, shall determine the amount of insurance. 2.3.15 HOLD HARMLESS The Applicant shall complete a hold harmless agreement for activities in the right-of-way, for activities in or near a sensitive area, and for major deviation from City standards. Hold harmless agreements are available in Public Works. 2.3.16 EASEMENT(S) The City reviews and approves all easements prior to recording with King County Records. For easements granted to the City, the legal description(s) and exhibit(s) shall be prepared and stamped by a land surveyor, or professional engineer registered in Washington State. The easement document shall include the easement legal description and a site plan showing the easement location, and shall specify maintenance responsibility, when applicable. (TMC 11.12.050) A. Utility Water, sewer, drainage facilities, minimum 20 feet wide, generally, ten feet either side of the centerline of the facility. Additional width may be required to accommodate maintenance. Utility easements adjacent to public right-of-way shall be ten feet wide. B. Traffic Where needed for purposes of traffic safety or access to schools, playgrounds, urban trails, shopping facilities, or other community facilities, public easements for bikeways or walkways, not less than ten feet in width, will be provided. C. Levee access Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 12 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS All proposed development adjacent to the Green River shall, as part of their permit submittal, grant access and maintenance easements for existing or future dikes/levees and riverbanks along the Green River. The City, in cooperation with King County, shall determine these easement locations and widths. D. Non -motorized easements The easement shall be wide enough to include the trail plus at least two feet on each side. 2.3.17 PROPERTY DEDICATION The City may require right-of-way dedication to incorporate necessary transportation improvements. Property shall be deeded to the City using a statutory warranty deed. The dedication must be accompanied by a Title report less than 6 months old and a completed excise tax affidavit. 2.3.18 MAINTENANCE AGREEMENT(S) A. Before Public Works final project approval, the Permittee/ Owner/ Contractor shall provide Maintenance Agreements, in recordable format, for common improvements such as access, utilities, surface water elements, and cul-de-sac landscape island. B. The Owner shall provide a maintenance agreement (and bond) for street lighting in subdivision. (TMC 11.12.110) 2.3.19 PERMITS FROM OTHER AGENCIES It is the Applicant's responsibility to obtain permits from outside agencies such as WDFW, Department of Natural Resources, Corps of Engineers, Department of Ecology, Department of Health, WSDOT or FEMA. The Director requires proof of other required permits prior to issuing permit approval. 2.3.20 DEVELOPER AGREEMENT The City and the Developer shall enter a Developer Agreement whenever required by the City. The Developer Agreement shall be written and signed before the permit is issued. The Developer Agreement should contain work descriptions and estimated costs. The Agreement should assign responsibilities for the work performance and shall provide an expiration date. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 13 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2.3.21 DEVELOPER REIMBURSEMENT AGREEMENT (LATECOMER AGREEMENT) The City may enter into agreements with developers who have installed public improvements valued at $50,000 or more, in order to provide for reimbursement of a fair prorated share by any real estate owners who have not contributed to the original cost of such facilities, and who subsequently connect to, or use the improvement. Such agreements shall be entered into at the time of, or prior to, issuance of a Certificate of Occupancy. The Public Works Department shall approve the prorated share based on construction cost provided by the Developer. The developer is responsible for initiating, executing, and, after City approval, recording the latecomers agreement with the County. The agreement must include a list of those properties that will benefit from the improvement, a map outlining and designating these properties, legal descriptions as required by the City, backup data supporting the costs submitted, and an expiration date. There are three acceptable methods for the determination of benefit: 1) gross parcel area, 2) property frontage, or 3) number of connections. The proponent will submit the format most appropriate to the nature of the project, as approved by the City. No credit will be given for open space, recreation areas, or undevelopable portions of the development proposal when calculating gross parcel area. The City will collect the latecomer's fee from property owners, which benefit from the improvements and will meet the Revised Code of Washington when disbursing payment to the developer. SECTION 2.4 CONSTRUCTION Contractor/Permittee shall perform all work in accordance with all federal, state, and local laws and shall be in accordance with approved plans, specifications, and permit conditions. The Permittee/Contractor shall maintain a set of approved plans, specifications, and associated permits on the job site. Permittee shall apply for a revision for any work proposed that is not according to approved plans and specifications, and permit conditions. 2.4.1 MATERIALS Materials proposed for use in construction of publicly owned or publicly maintained utilities must be in conformance to approved material standards. Unapproved materials cannot be adequately evaluated within the plan review period. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 14 A INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2.4.2 PRECONSTRUCTION CONFERENCE Prior to beginning any work, Permittee/Contractor shall contact the City's Inspector to arrange a preconstruction conference. 2.4.3 CONSTRUCTION ON EASEMENT Construction on easement(s) shall be performed strictly in accordance with the easement provisions. The Permittee/Contractor shall make himself aware of all conditions pertaining to the easement agreement. No work shall be permitted in easement areas where City utilities may be located until specifically authorized by the City. 2.4.4 RIGHT-OF-WAY A. Access 1. During construction and until permanent access is installed and approved, provide pedestrian/ADA and emergency access to any abutting public school, public building, urban trail, transit stop, or business. 2. Provide temporary sidewalk, curb ramp, or bike path, meeting the Director's approval, when construction blocks existing. 3. Maintain access to fire stations, fire hydrants, fire escapes, and fire fighting equipment. Do not place materials or obstructions within 15 feet of fire hydrants. B. Monuments 1. Locate and protect survey monuments, property corners, bench marks, and other such. 2. All disturbed monuments shall be replaced by a Washington State licensed surveyor at the Owner's expense. C. Drainage 1. Keep existing drainage features free of dirt and other debris. 2. Reroute flow when it is necessary to block or otherwise interrupt a drainage feature. (TMc11.08.220) D. Cuts 1. Roadway crossings for utilities shall be by jacking, tunneling, or boring with "windows" or shafts 20 feet or more apart. 2. Crossing under State Highways and crossings involving railroads or other easements and rights -of -way will also require approval from the appropriate agency. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 15 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 3. Newly constructed or recently overlaid streets shall not be open cut for three years. Open cuts are allowed on an exception basis and only when roadway conditions warrant or in cases of undue hardship. 4. All pavement cuts in right-of-way are subject to a pavement mitigation fee. 5. All pavement cuts in right-of-way must have a preapproved street and pavement restoration plan. E. Restoration Any disturbance of right-of-way or right-of-way facilities, including sidewalks and vegetation, shall be restored to current City standards. The City shall approve all backfill and pavement base. All damaged or broken pavement and other disturbed pavement shall be replaced with the same type and depth of pavement adjoining the disturbed area. F. Restrictions 1. From the third Thursday in November to the following January 2nd, the Director restricts lane closures in the Tukwila Urban Center. 2. Maintain emergency, pedestrian, and vehicular access to buildings, trails, and transit at all times. 3. Keep all roadways free of dirt and debris using street sweepers. Use of water trucks for cleaning roadways requires preapproval from the Director. 4. Install and secure non-skid steel plates over any trench at any time work has stopped and the trench is left open. Place warning signs in locations adequate to warn drivers and bicyclists. Warning signs shall read "Motorcycles Use Extreme Caution" and "Caution Steel Plates Ahead". 2.4.5 TRENCH EXCAVATION Construct per City of Tukwila standard detail WS-18 and WISHA/OSHA requirements and meet the erosion prevention and sediment control requirements. A. All trench excavation operations shall meet or exceed all applicable shoring laws for trenches. B. During excavation, divert any surface water and pump the trench as needed to keep the trench free of water. Store pumping Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 16 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS equipment near the trench excavation to ensure that these provisions are carried out. Completely excavate boulders, rocks, roots, and other obstructions or excavate to the width of the trench, and to a depth of 6 inches below the bottom pipe grade. C. Use hand tools to: 1. Finish the trench bottom in such a manner that the pipe will have a uniform slope along the entire length of the pipe. 2. Excavate the bell holes enough to make up the joint. D. Extend trenching operations a maximum of 100 feel in advance of the pipe laying operation. For excavation greater than 100 feet, the Permittee must obtain written approval from the Director. E. Pipe Installation: 1. Pipe deflection is not allowed. 2. Imbed pipe in 5/8" crushed gravel. 3. According to Standard Specifications and the manufacturer's recommendation. 4. Install pipe cover and surface restoration as soon as possible following installation and testing of pipe. 5. Mark all new pipes with 3M EMS 4" Extended Range Marker Balls (Model No. 140X-XR-ID). Use appropriate colors to match APWA utility locate color codes ( http://www.callbeforevoudig.org/color.htm ). 2.4.6 STOP WORK ORDER A. Following written notice to the Permittee, the Director may suspend or revoke any permit for any of the following reasons: 1. Changes in site runoff characteristics upon which the permit is granted. 2. Construction not in accordance with the approved plans. 3. Noncompliance with correction notice(s) or stop work order(s) issued for erosion or sediment controls. 4. Immediate danger to a downstream area or adjacent property as determined by the Director. B. The Director may post a site with a "stop work" order directing that all construction activity cease immediately. The issuance of a "stop Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 17 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS work" order may include any "discretionary conditions" or "standard requirements" which must be fulfilled before work under the Permit may continue. C. No person shall continue or permit the continuance of work in an area covered by a "stop work" order, except work required to correct an imminent safety hazard as prescribed by the Director. D. The cost of any corrective measures shall be borne by the Permittee. 2.4.7 INSPECTIONS A. All public infrastructure construction is to be done under the control and at the direction of the Public Works Director. Public Works supervises and inspects the design and installation of public improvements. B. For private development, Public Works approves permits and inspects the public works elements of the development. C. Field Inspections 1. The Permittee shall schedule Public Works inspections at least 24- hours in advance. The inspections shall occur at completion of significant work segments, at intervals sufficient to confirm all work is performed in accordance with the plans and specifications, and at the project completion. 2. Work covered prior to inspection will be uncovered at the expense of the Permittee. 3. At a minimum, the Permittee shall request inspections for the following events: a. Before backfilling, for compliance with all construction standards. b. After placement of rock, for compaction and material quantity and quality verification. c. Prior to the placement of any materials, which would preclude full and complete inspection of construction, which will be buried or covered. d. At completion of sub -grade, for compaction and grade. e. During and after placement of finish course for compaction and material (quantity and quality). Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 18 r 1 r1 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS f. After placement of forms and before pouring for line, grade, and compaction. g. All pressure testing, including air and water tests. D. Sampling and Testing 1. Tests and material sampling for the purposes of determining compliance with the specifications shall be required at the Director's discretion. All costs incurred for testing or sampling, done at the Director's request, shall be the responsibility of the Permittee. 2. Determination of field density of compacted earth will be per ASTM D1557: "Modified Proctor." E. Video Pipe Inspection 1. Prior to inspection and acceptance of any sanitary sewer and storm drainage pipes, all pipes and structures shall be cleaned and flushed. Any obstructions to flow within the system, (such as rubble, mortar and wedged debris), shall be removed at the nearest structure. 2. Cleaning and flushing of the pipes and structures shall be at the sole cost of the permittee. 3. Video Inspection: The permittee shall perform a complete video inspection of all 8-inch and larger pipes and associated appurtenances. The contractor shall provide to the City a digital video disk (DVD) audio-visual recording of these 'inspections. The DVD shall be formatted to allow real time fast forward and reverse review of the inspections. Individual structure -to - structure pipe runs shall be saved as separate files on DVD with file names relating to structures identifications numbers and plan set, or as approved by the City. All equipment and materials shall be compatible with existing City -owned equipment. It shall be the permittee's responsibility to confirm equipment compatibility and DVD file formats with the City prior to inspection. A Pan -And -Tilt Camera with the proper sized light head for the size of pipe being inspected shall be utilized by the Contractor at all times for televised inspection. The finished product shall be clear and have the proper amount of lighting to see any and all defects encountered during the inspection. Camera shall be equipped with a 1" reference ball at all times to aid with inspection of 8-inch diameter pipe. Pipe of 12-inch diameter or larger will require a 2" reference ball to aid with the inspection Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 19 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS At all times during the video inspection process, the City shall be present. The City shall be notified forty-eight (48) hours prior to any video inspection. The Permittee shall bear all costs of video inspection and all costs incurred in correcting any deficiencies found during video inspection including the cost of additional television inspection that may be required by the City to verify the correction of said deficiency. SECTION 2.5 FINAL PROJECT APPROVAL 2.5.1 WORK COMPLETION Upon completion of all required project elements, the Permittee shall request a final inspection by contacting the Public Works Inspector. The permit process is complete upon sign -off of the issued permit(s) by the Director. 2.5.2 PERMANENT STABILIZATION All disturbed areas must have permanent stabilization in place and functioning before the temporary erosion prevention and sediment control measures are removed. 2.5.3 FLOOD CERTIFICATE Upon completion of construction and prior to Final Public Works Inspection, the Permittee shall provide Public Works with a completed Elevation Certificate for residential. For non-residential, Permittee shall provide a completed Flood -proof Certificate or Elevation Certificate. 2.5.4 FINANCIAL GUARANTEE The owner/agent shall provide a two-year guarantee for the faithful performance of the operation and maintenance to improvements in the right-of-way or on City property. The guarantee shall be by a surety approved by the Director. 2.5.5 TURNOVER DOCUMENTS The City requires Turnover Documents when a developer constructs public infrastructure as part of private development. The owner/agent Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 20 r 1 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS shall provide a complete set of turnover documents before Final Public Works Inspection. The Mayor's Office or the City Council must accept constructed infrastructure, when the value exceeds $25,000. If the City does not accept the constructed infrastructure, the ownership and maintenance of the facilities remains the sole responsibility of the Developer. 2.5.6 RECORD DRAWINGS All projects, except most single-family residences, require Record Drawings. Projects will not receive final approval from Public Works until a complete set of Record Drawings is submitted and approved. For public facilities and facilities installed in the right-of-way, the owner/agent shall provide record construction drawings at project closeout. Record drawings shall accurately reflect design revisions that were made to the approved plans during construction. The record drawings shall locate all existing and abandoned utilities encountered during construction, but not shown on the approved plans. A Washington State registered professional engineer of record shall approve the record drawings. As -built survey information provided on a record drawing shall be provided by a Professional Land Surveyor currently licensed in the State of Washington, who certifies that the as - built survey and revisions to the Record Drawings were performed under the surveyor's direction. Information from sources such as the contractor's red -lined drawings, for which the surveyor is not responsible, shall be clearly noted/identified on the face of the Record Drawings. The owner/agent shall provide record drawings on 4.0 mil double matte mylar drafting film (24" by 36") and in AutoCAD format and PDF on CD (or DVD). Each drawing, except for the digital file, shall bear the engineer and the surveyor stamps, signed and dated. 2.5.7 SURVEY DATUM The drawing and all utility features shall be accurately located in Washington State Plane (grid) Coordinates, North Zone, using NAD 83/91 survey control and tied to at least two City of Tukwila Horizontal Control Monuments. Elevations shall be NAVD 88. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 21 (INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS CHAPTER 4 STREETS SECTION 4.0 GENERAL 4.0.1 TRANSPORTATION ELEMENT All roadway design in the City shall meet the design guidelines and requirements in the Transportation Element of the Comprehensive Land Use Plan, other applicable subarea plans, and the Subdivision Code (TMC 17.20). 4.0.2 MANUFACTURING/INDUSTRIAL CENTER For projects in the M/IC, provide driveway design and location per RS- 30. 4.0.3 DEVELOPMENT SITES A paved street surface shall serve all development sites. This street surface shall connect to an existing paved street surface. (TMC 11.12.060) 4.0.4 FRONTAGE IMPROVEMENTS A. The installation of street frontage improvements is required prior to issuance of a certificate of occupancy for new construction, other than single-family homes, or prior to final approval for subdivisions and 5-9 lot short plats and Planned Residential Developments. For additions and remodels to existing buildings, see TMC 11.12.070. B. Complete street frontage improvements shall be installed along the entire frontage of the property at the sole cost of the permittee as directed by the Director. Street frontage improvements may include curb, gutter, sidewalk, storm drainage, street lighting, traffic signal equipment, utility installation or relocation, landscaping strip, street trees and landscaping, irrigation, street widening, and channelization. Beyond the property frontage, the Permittee shall provide ramps from the new sidewalk or walkway to the exiting shoulder, and pavement and channelization tapering back to the existing pavement and channelization as needed for safety. C. When (due to site topography, city plans for improvement projects, or other similar reasons) the Director determines that street frontage improvements cannot or should not be constructed at the time of Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 22 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS building construction, the property owner shall, prior to issuance of the building permit, at the direction of the Director: 1. Pay to the City an amount equal to the property owner's cost of installing the required improvements prior to issuance of a building permit. The property owner shall provide documentation satisfactory to the Director that establishes the cost of the materials, labor, quantities; or 2. Record an agreement which provides for these improvements to be installed by the property owner by a date acceptable to the Director; or 3. Record an agreement to not protest a local improvement district to improve the street frontage. D. If, at a time subsequent to the issuance of a building permit, a local improvement district is established that includes the property for which the building permit was issued, the property may be considered in the compilation of the local improvement district assessment with the appropriate amount of costs of construction expended by the developer. E. The Director under either of the following conditions may waive the requirement for installation of frontage improvements: 1. If the exact location of the adjacent street frontage improvements cannot be determined at this time; or 2. If the installation of the required improvement would cause significant adverse environmental impacts. F. Additions, alterations, repairs adding square footage to existing structure, or new accessory building: 1. Street improvements shall be constructed and shall be determined by the Director. 2. Property owner costs shall be 10% or less of the total improvement cost. 3. Director may waive. G. Additional structure(s) on private campus 1. Street improvements shall be constructed and shall be determined by the Director. 2. Property owner costs shall be 10% or less of the total improvement cost. H. Additional structure(s) on Public campus Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 23 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 1. Street improvements shall be installed along entire frontage. 2. Corner lots, etc. when cost does not dictate all frontage be improved, Director will determine which frontage will be improved. I. Single Family Residence (TMC 11.12.080) 1. In all cases install surface water drainage on all frontage. 2. Abutting unpaved street, not a corner lot, requires a 1/2 street section of pavement or a No Protest LID for pavement and storm drainage. 3. Abutting both paved and unpaved requires 1/2 street pavement and drainage on unpaved right-of-way. 4. Contiguous to a parcel served by paved street requires 1/2 street and drainage frontage abutting existing paved right-of-way. 5. Abutting a paved street surface requires complete minor pavement edge improvements. J. Landscaping, easement, access tracts (TMC 11.12.100) The following apply when there are frontage improvements: 1. Retain existing vegetation, and replace and replant existing vegetation that gets disturbed during development. 2. Arterial street landscaping must include installation of ground cover in erosion areas and installation of trees per City standards. 3. Abutting property owners maintain landscaping, unless City specifically accepts the responsibility. 4. City may require removal of landscaping that encroaches on right-of-way. 4.0.5 RIGHTS -OF -WAY, EASEMENTS, AND IMPROVEMENTS The developer shall dedicate right-of-way and grant easements for all public streets and non -motorized facilities needed to serve a proposed development. (TMC 11.12.050) 4.0.6 DEAD END STREET (TMC 17.20.030) New public and private dead-end streets are not allowed, unless justification can be provided for their necessity. If new or necessary, they must terminate with a cul-de-sac and a landscaped island. The maximum cul-de-sac length allowed is 600', measured from the edge of Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 24 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS curb or edge of pavement at the connection to the end of the right-of- way at the cul-de-sac. A hammerhead is allowed when the road is less than 200 feet and serves less than six lots. A temporary dead end can terminate with barricade(s). (TMC 11.12.170) 4.0.7 GRADE The maximum grade for all roadways and driveways shall be fifteen percent (15%). Grades over 15% require approval of the Director and the Fire Department. 4.0.8 PARKING LOTS All permanent parking lots shall be paved. Temporary Tots can be gravel with paved driveway aprons if lot is paved within three (3) years of operating temporary lot. 4.0.9 BUS Provide bus pullouts as required on principal arterials. 4.0.10 UTILITY RELOCATION The developer shall relocate any utilities that must be relocated to accommodate street or other required improvements. 4.0.11 NON -MOTORIZED FACILITIES (TMC 11.12.150) A. Pedestrian Systems 1. Internal pedestrian circulation systems shall be provided within and between existing, new and redeveloping commercial, multifamily and single family developments, activity centers, and existing frontage pedestrian systems. 2. Concrete sidewalks a. Arterial street - on both sides. b. Non -arterial street longer than 200 feet -both sides. c. Non -arterial less than 200 feet - one side. d. Public streets accessing existing or planned sidewalk, activity centers, parks, schools, neighborhoods, or public transit facilities - both sides. e. Director may grant exception. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 25 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 3 Pavement in lieu of concrete is acceptable when: a. The facility is temporary. b. Flexible pavement is required due to soils and topography. c. The neighborhood character does not warrant concrete. B. Bikeways and Walkways 1. Bikeways and walkways will be surfaced with asphalt concrete. Bikeways and walkways will be illuminated in accordance with the specifications set forth in this standard. Install posts or other facilities to prohibit the passage of motor vehicles through pedestrian easements. C. Non -motorized easements 1. Following City approval, record with King County Records, an easement titled "City of Tukwila Non -motorized Public Easement". 2. The easement shall be the trail width plus 2 feet on each side (can vary). A designated bicycle route may require additional paved right-of-way. 3. The easement shall specify the maintenance requirements and designate responsible parties. 4.0.12 NEW STREETS A. Where a street is designated by the Land Use Comprehensive Plan and is within the boundaries of a development, the developer shall dedicate the entire right-of-way, and shall construct frontage improvement. B. Where a street designated in the Comprehensive Plan is adjacent to a boundary of a development, the developer shall dedicate the necessary right-of-way and shall construct frontage improvement. 4.0.13 HALF STREET The construction of half -street improvements will be permitted only along the boundaries of a development. Pavement, at least twenty (20) feet in width or as required for that street classification (measured from curb face) will be provided, and an adequate right-of-way width may be dedicated. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 26 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 4.0.14 ALLEYS The Director may allow an alley at the rear of single-family residential, multifamily residential, commercial, or industrial property. An alley not required for fire suppression access, solid waste collection, or other public purposes may be privately owned. A private alley must conform to all improvement standards for public alleys, must be posted as a private alley and must meet all other provisions applicable to private streets. A dead-end on a public alley is prohibited. 4.0.15 SIGHT DISTANCE Sight distance at intersections and right-of-way access points shall meet the most current edition of AASHTO Policy on Geometric Design and shall be clear of sight obstructions. 4.0.16 PAVEMENTS AND PERMEABLE PAVEMENTS Where the terms "asphalt" and "concrete" are used in these standards as general descriptors of surfacing materials, the terms shall be understood to include both the impermeable and the permeable versions of the pavement. Where a permeable pavement is proposed on a fire lane, the surface must be capable of supporting a live load of HS-25 (AASHTO Load Factor Design) and an outrigger load of 45,000 lbs applied to an area of 2 feet x 2 feet on 16-foot centers. SECTION 4.1 PRIVATE STREETS (TMC 17.20.030.C(5)) A. The City allows private streets when the street: 1. Serves four or fewer lots, 2. Is part of a Planned Residential Development, or 3. Serves commercial or industrial facilities where no circulation continuity is necessary. B. Owner(s) must provide: 1. Recorded covenant granting the City the right to fully use the private street for emergency access and public service vehicles. 2. Recorded provision for the ownership and maintenance of the private street by the owners within the development. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 27 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 3. Final site plans showing private streets must include an unconditional and irrevocable offer of dedication that may be accepted by the City Council at such time as the street is needed for development of contiguous property or for the protection of public health, safety and welfare. The design and improvement of any private street will be subject to all of the requirements prescribed by this document for public streets. C. Owner(s) must install and maintain a sign indicating the street is private. SECTION 4.2 PUBLIC STREETS Streets longer than 200 feet or streets that serve more than four lots shall be constructed to public street standards. See City of Tukwila standard detail RS-01. 4.2.1 GEOMETRIC DESIGN On the plans, note the sight distance for horizontal and vertical curves, intersections, and access points. Setbacks shall meet the current edition of the AASHTO Policy on Geometric Design. (TMC 11.20.090) 4.2.2 ALIGNMENT AND CONNECTIONS A. Alignment 1. Align proposed streets and other primary accesses with existing streets or accesses. 2. Relate alignments, where practical, to natural topography. 3. Select alignment to minimize grading and avoid excessive runoff. B. Connections 1. Provide street connection to any existing public street or right-of- way "stub" abutting the proposed development. 2. Provide "stub" roads for connection to any adjacent undeveloped, or partially developed, contiguous land, and to any site officially designated for a public facility. 3. Locate a stub so that it allows for future block sizes consistent with the Land Use Comprehensive Plan. 4. Locate "stub" connections to other "stub" roads on adjacent and nearby property. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 28 / 1 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 5. Install "Dead End" signage and barricades per the current edition of the MUTCD. 4.2.3 STREET INTERSECTIONS A. Primary points of access or street intersections with centerline offsets of less than one hundred fifty (150) feet will not be allowed unless the Director finds special conditions requiring a reduction. The intersection spacing requirements will not be used as criteria/justification to close existing streets. B. Unless required by street spacing standards, intersections on curves will be avoided. C. Right-of-way and curb radii will be provided at all intersections in accordance with the Land Use Comprehensive Plan and the Transportation Element. Curb radii will be the smallest necessary to achieve the goals at each intersection. D. Turning lanes and acceleration/deceleration lanes will be provided as required by the current edition of the AASHTO Policy on Geometric Design. 4.2.4 UNDERGROUND UTILITIES A. Where several utilities are planned or required in the same right-of- way corridor, joint trenches shall be used whenever possible. B. Where underground utilities are planned in the right-of-way corridor, utilities shall be placed under the paved portions of the right-of-way whenever possible. C. Where underground utilities are planned under an existing permeable pavement or an existing bioretention facility, the utility shall take measures to protect the utility trench from infiltration of stormwater, without compromising the function of the permeable pavement or the bioretention facility. D. Where a permeable pavement or a bioretention facility is planned over an existing underground utility, the developer shall protect the utility trench from infiltration of stormwater. 1147E. All new electrical and communication facilities shall be underground per TMC 1 1.28. F. Undergrounding requirements for new facilities or rebuild, replacements and additions are described in TMC 11.28.070 and TMC 11.28.080. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 29 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 4.2.5 ACCESS A. Pedestrian/ADA and emergency vehicle access will be provided to any abutting public school, public building, trail, or transit stop. (TMC 11.12.150) B. Development 1. All development sites shall be served by a paved street surface that connects to an existing paved street surface. (TMC 11.12.060) 2. Applicant may provide an access lane rather than a private street if the access serves four or fewer Tots and is 200' or shorter. The access lane may be on an easement, shall be 20 feet wide and paved the full 20' width and will be owned and maintained by the property owners served by the lane. 3. Provide more than one connection to the existing public street system for any development, or part thereof, of four acres or more. If not otherwise prohibited, each connection will be to a different collector or arterial street. Where the site includes only a single frontage of less than 400 feet, this requirement may be met by provision of one or more stub roads. 4.2.6 RIGHT-OF-WAY VEGETATION A. New vegetation must match or complement existing street vegetation or be approved by the Director. B. New vegetation in the Tukwila Urban Center must meet the adopted plan (refer to Ordinance No. 1276). C. Notify owners within 100 feet when removing or pruning vegetation that is 4-inch diameter or larger. D. No maple, Lombardy poplar, cottonwood, gum, or other trees with invasive root system. (TMC 1 1.20.070) E. Vegetation removed from right-of-way or damaged during construction shall be replaced with equivalent number, size, quality, and species. (TMC 11.20.110) F. The design shall include a plan for irrigation. Irrigation is required for two years following project acceptance. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 30 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS SECTION 4.3 ILLUMINATION 4.3.1 GENERAL A. Required along all public streets, including new public streets in subdivisions and short subdivisions. (TMC 11.12.110) B. Required at the intersection of a public and a private street. C. Not required along a private street. (TMC 11.12.110) D. All wiring, conduit and power connections, new or relocated, shall be underground. E. For a new subdivision, Developer assumes maintenance and power cost until the development is 50% or more occupied. (TMC 11.12.010.c) F. Developer designs to City standards, installs new lighting, and relocates existing lighting along development frontage. G. Provide calculations using ALADAN found under "Roadways" at the General Electric website. 4.3.2 MATERIALS A. New installations shall use cut-off optics. Additions to existing street lighting systems shall match the existing fixtures. B. Luminaires - Hubbel or General Electric (GE). C. Wattage per City of Tukwila standard detail RS-24. GE Cutoff # MDCL SOAllFC32F Drop Lens # MDRL SOAllRMS32F HUBBEL Cutoff # RLCD S38032035F0M53 Drop Lens # RLGD S38072035F0M53 D. Junction Boxes - per Standard Specifications and Standard Plans; (see J-40.30-00 and J-40.10-00), with galvanized lids and frames and 48" bond straps between the traffic bearing lid and frame. E. Conduit - 2-inch 1. Most applications - schedule 40 polyvinyl chloride (PVC) with bell ends, unless capped for non-use. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 31 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2. Roadway application - schedule 40 polyvinyl chloride (PVC) with bell ends, unless capped for non-use. F. Circuit conductors - all conductors shall be stranded copper sized per current NEC. All grounds will be green #8 AWG stranded copper. G. Pole wiring - # 10 AWG pole and bracket cable. H. Fuse kits - Homac #SLK-M or SEC #1791-SF. I. Fuses - FMN-5. J. Putty tape - Scotchcast electrical insulation. K. Electrical tape - 3M Super 33 or better. L. Photocell. M. Shorting cap. 4.3.3 INSTALLATION A. J-boxes - Install so the top of the box is at grade and positioned so that all conduits are 4 inches from the inside walls. Fill with clean drainage gravel, leaving at least 6 inches of free space between the conduit and the top of the box. B. Wire splice. 1. Two -wire splices - Crimp the butt splice with 4-inch minimum length of thick-walled shrink tube. 2. Three or more wire splices - Use split bolt and cover with one wrap of electrical tape, followed by one wrap of Scotchcast electrical insulation putty tape and two wraps of 3M Super 33 or better electrical tape. C. Install one photocell per lighting system and shorting caps on remaining luminaires. SECTION 4.4 TRAFFIC SIGNALS 4.4.1 GENERAL A. A licensed engineer experienced in traffic signal design shall prepare all traffic signal design and modifications. The Director or designee shall approve all traffic signal system equipment submittals. The City shall be the sole judge of any materials to be considered equal or better. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 32 \_J INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS B. When a proposed street or driveway design will interfere with existing traffic signal facilities, the developer shall modify or relocate the signal. (TMC 11.12.160) 4.4.2 MATERIALS A. All new or revised traffic signal systems shall include, but not be limited to the following minimum requirements: 1. Current Tukwila design ITS signal cabinet, controller and all peripherals. 2. Controller foundation shall be a modified Standard Plan J-6C. 3. PTZ traffic monitoring camera. 4. Battery backup power system. 5. System interconnection to the City's traffic operations fiber-optic network. 6. All signal heads and visors shall be powder -coated green. Back plates shall be louvered and powder coated black. 7. All vehicular signal indications will be 12" tinted LED modules meeting the current ITE specifications and be manufactured by either Dialight, GE or pre -approved equivalent. 8. All pedestrian signal indications will be countdown type LED modules meeting the current ITE specifications and be manufactured by Dialight, GE or pre -approved equivalent. 9. All vehicle detection shall be performed by use of an induction loop system unless approved by the Director. 10. All pedestrian push buttons shall comply with Standard Plan J-5 until the City of Tukwila standard detail RS-23 is revised. 1 1. All emergency preemption devices and cabling will be current model "Opticom" brand. 12. All new or modified signal poles shall have aluminum terminal cabinets installed. 13. Meet current ADA requirements. 14. Meet current Tukwila signing and marking standards. B. Submit catalog cuts and material data sheets to the City for review and approval. The City will be the sole judge of a product being approved as equal or better. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 33 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 4.4.3 (INSTALLATION Install detector cable from preemption detector to controller with no splices. SECTION 4.5 VEHICLE DETECTOR LOOPS 4.5.1 MATERIALS A. Loop wire per Standard Specification Section 9-29.3. B. Lead-in cable per Standard Specification Section 9-29.3. C. Wire 1. Loop wire - # 12 USE stranded copper conductor Class B, with chemically cross -linked polyethylene type RHH-RHW, thickness of code. 2. Shielded loop lead-in wire - # 18 stranded tinned copper, twisted pair, 2 conductor cable with polyethylene insulation, conductor cabled, and shall have aluminum polyester foil shield furnished in 100% coverage, stranded tinned -copper drain wire and an overall chrome -vinyl jacket. D. Wire splice kits - 3M vinyl mastic pads Model #2200 (or #2210 rolls) except for Federally funded projects - Scotchcast Model 82 epoxy splice kit. E. Loop sealant - Crafco, Specialty Asphalt, or Albina Asphalt, meeting ASTM D312 Type 4. F. Mastic Pads - 3M 2200. G. Use Standard Plan J-8b, c & d for guidance. 4.5.2 INSTALLATION A. Vehicle Detection Loops 1. Proper installation of vehicle detection loops is vital to performance of the controller. Never install loops during rainy weather or when pavement is wet. Close traffic lane(s) during loop installation. Permittee shall not allow traffic across the work area until the Director approves the work. 2. Make just enough saw cuts and cut only the amount of wire that can be installed before the end of that working day. 3. Install loops after grinding the surface pavement or prior to paving final lift of asphalt. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 34 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 4. Test loops before filling saw cuts with sealant. See Section 4.3 for testing specifics. B. Splices 1. Install a continuous piece of loop wire to the J-box. Shielded loop lead-in wire shall be continuous from the controller to the junction box closet to the loop where it is spliced to the loop wire. 2. Connect all splices and underground induction loop circuits inside the junction boxes. The only splice allowed in the induction circuit shall be the shielded cable to loop wire splice. 3. Splices shall be crimped, soldered and insulated with 3M 2200 Mastic Pads. 4. Tag all loop lead-in wire at the splice point and at the controller with a small permanent band bearing loop designation. C. Saw Cuts 1. Remove sharp protrusions and clean all saw cuts using a high- pressure washer followed by drying with 100-psi minimum air pressure. 2. Make all saw cuts in the top course of pavement a full 1 /4-inch wide and 2 inches deep. Make cuts in the base course a minimum of 1 inch deep. Make the saw cut at least 1-1/2 inches deep for installations having three or more turns of wire. Do not cut through the pavement to the subgrade. 3. For square cuts, hand chisel the corners. 4. Gradually transition the last 12 to 18 inches of the lead-in cut to a full depth cut where conduit stubs out under the curb and gutter. D. Loops 1. Install the wiring using a blunt -nosed wooden wedge. 2. Do not kink or fold -back the wiring. 3. Lay the detector loop wire in the clockwise direction being careful not to pull the wire. Lay the wire loosely around any corners. 4. Install 3 turns for loops that will be hooked up in series, and 4 turns for loops that will be operating as a single loop. 5. Place a tag on the start end of the wire for later identification. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 35 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 6. Remove all slack from the wiring prior to sealant application. E. Sealant 1. Seal saw -cuts with sealant before exposure to traffic. 2. Install loop sealant by pressure injection. During installation, avoid creating air bubbles or foam in the sealant. 4.5.3 TESTING Perform all four of the following tests on each detector loop. Perform the tests in the presence of a City representative. Record the test results and submit to the Director. Perform all tests at the amplifier location after the loop is completely installed. If any of the installations fail to pass all tests, the Permittee shall repair the loop or lead-in cable and retest (tests A-D). 1. Test A - Measure the DC resistance between the two lead-in cable wires using a volt ohmmeter. The resistance shall be 5 ohms or less. 2. Test B - Prior to connection to grounding, perform a megohm meter test at 500 volts DC between the lead-in cable shield and grounding. The resistance shall equal or exceed 50 megaohms. 3. Test C - Perform a meggar test between the loop circuit and grounding. The resistance shall equal or exceed 50 megaohms. 4. Test D - Perform an induction test on each induction loop. A Type 1 loop passes if the inductance level is equal to or greater than 150 microhenries. A Type 2 loop passes if the inductance level is equal to or greater than 75 microhenries. SECTION 4.6 SIGNS AND MARKINGS The Director determines the type, size, and location of signs and markings in the right-of-way. Signs shall meet the URBAN AREAS criteria in the MUTCD and meet the criteria in TMC 11.24 Placement of Signs or Banners. 4.6.1 MATERIALS A. Markings 1. All pavement markings shall comply with the MUTCD , Standard Plans and the Standard Specifications, unless otherwise specified herein, or if waived by the City Engineer. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 36 / INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 2. All arrows shall be per Standard Plan Numbers M-24.20-01 for high speed roadways (over 45 mph) and M-24.40-01 for low speed roadways (under 40 mph). 3. All traffic signalized intersections that include bicycle lanes must include the bicycle detector pavement marking per the Guide for the Development of Bicycle Facilities, AASHTO, 1999. (http://www.wsdot.wa.gov/bike/pdf/bikebook.pdf ) 4. All bike lanes shall include markings per Standard Plan M-9.50- 01 5. Profiled and embossed plastic lines per Standard Plan M-20.20- 01 may be used in place of type 1 traffic buttons per Tukwila standard detail RS-13, provided that both ends are marked by type 2 reflectors. B. Street Signs Refer to City of Tukwila standard detail RS-10 for Street Name Signs. C. Other Signs 1. Posts: a. Round posts are not allowed. b. In areas with frontage improvements, treated wood 4" X 4", using 5/16" x 2-1/2" galvanized or stainless lag screws and flat washers. c. In other areas, galvanized u-channel posts using galvanized or stainless 5/16" x 1-1/2" bolts, nuts, flat and lock washers. 2. Signs: a. Street markers shall have white lettering and border on a green background. The sign shall be six inches high and shall have 4-inch letters. b. Stop and regulatory signs shall be High Intensity Prismatic reflective sheeting, or City Engineer approved equivalent. c. Regulatory signs shall have a border. d. Other Signs. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 37 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS 4.6.2 INSTALLATION A. Street Signs The Developer shall install all street signs on public right-of-way (including street name signs, warning signs, and regulatory signs). B. Other Signs 1. Posts: a. Do not backfill holes with concrete. b. In soil, dig hole at least 30" deep. Backfill to the top using 5/8" angular crushed rock. c. On a raised island or in asphalt or concrete, dig a hole that is at least two feet in diameter, and at least 30 inches deep. Back fill to top of hole using 5/8" angular, crushed rock. d. For street markers, install at intersection. 2. Mount: a. Primary signs so that there are seven feet from the ground to the bottom of the sign. b. Secondary signs on the same post so there is at least six feet from the ground to the bottom of the sign. c. Object markers and large single or double arrows so there is at least four to five feet from the ground to the bottom of the sign. d. Opposing chevrons or signs for both directions on same post, if they are clearly visible from both directions. e. Street markers on top of post using a metal bracket. f. On street light poles using stainless bands and mounting hardware. So that posts do not show above the sign, except when installing a street marker bracket. g. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 38 1 f 1 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS SECTION 4.7 STREET STANDARD DETAILS RS-01 Typical Roadway Section RS-02 Turn Around - Cul-de-sac and Hammerhead RS-03 Pavement Restoration RS-04 Bollard RS-05 Steel Pipe Railing RS-06 Mailbox Installation RS-07 Street Monument w/ Frame and Cover RS-08-A Residential Driveway Alternate 1 RS-08-B Residential Driveway Alternate 2 RS-08-C Residential Driveway Alternate 3 RS-09 Commercial Driveway RS-10 Street Name Sign RS-11 Sidewalk RS-12 Curb Ramp RS-13 Raised Pavement Marker RS-14 Typical Sign Installation RS-15 Street Opening RS-16 Left Turn - Noncontinuous RS-17 Left Turn- Two-way Left RS-18 [Under Revision - refer to Section 4.4.2] RS-19 Crosswalk - Design and Placement RS-20 Street Light Pole - 30' to 40' Mounting Height RS-21 Residential Street Light Pole - 30' to 40' Mounting Height RS-22 [Deleted - see section 4.4.2] RS-23 [Under Revision - refer to section 4.4.2] RS-24 Street Light Design Guidelines RS-25 Luminaire Foundation - Sidewalk Application RS-26 Ground Rod Box RS-27 Curb and Gutter - Catch Basin Surround RS-28 Induction Loop - Vehicle Detectors RS-29 Traffic Signal - Controller Cabinet RS-30 M/IC Driveway Design and Location RS-31 Utility Adjustment RS-32 Work Zone Plan - Centerline Work RS-33 Work Zone Plan - Surveying Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 39 INFRASTRUCTURE DESIGN AND CONSTRUCTION STANDARDS TBD Residential Driveway Alternate 4, Ribbon Driveway TBD Inlet to Bioretention Curb Extension TBD Trench Drain and Outlet from Bioretention Curb Extension TBD Sidewalk, Reverse Slope Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 40 • APPENDIX A DEFINITIONS DEFINITIONS AND ACRONYMS These definitions are for use with these Standards. Unless specifically defined below, words or phrases used in this ordinance shall be interpreted to give them the meaning they have in common usage and to give this ordinance its most reasonable application. AASHTO - American Association of State Highway and Transportation Officials. ACCESS - means the safe, adequate, and usable ingress/egress (entrance/exit) to a property or use. ACTUAL ELEVATION - means the elevation in relationship to mean sea level. ADVERSE IMPACT - means any deleterious effect on waters or wetlands, including their quality, quantity, surface area, species composition, aesthetics or usefulness for human or natural uses which are or may potentially be harmful or injurious to human health, welfare, safety or property, to biological productivity, diversity, or stability or which unreasonably interferes with the enjoyment of life or property, including outdoor recreation. AGRICULTURAL LAND MANAGEMENT PRACTICES - means those methods and procedures used in the cultivation of land in order to further crop production and conservation of related soil and water resources. AIA - American Institute of Architecture. ANNUAL AVERAGE DAILY TRAFFIC (AADT) - means daily traffic that is averaged over one calendar year. APPLICANT - means any person, governmental agency, or other entity that executes the necessary forms to procure official approval of a project or a permit to carry out construction of a project. STANDARD SPECIFICATIONS - means the current edition of the standard specifications for municipal public works construction prepared by the Washington State Chapter of the American Public Works Association and the Washington State Department of Transportation, as adopted by the City of Tukwila. ASTM - American Standards for Testing Materials. AVERAGE DAILY TRAFFIC (ADT) - means the average number of vehicles passing a specified point during a 24-hour period. AWWA - American Water Works Association. BACKFLOW - means a flow of water or other liquids, gases or solids from any source back into the customer's plumbing system or the water purveyor's distribution system. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 41 / 0 I BACKFLOW PREVENTION DEVICE - means a device, approved by the State Department of Health and by the American Water Works Association, used to counteract back pressure or prevent back -siphoning into the distribution system of a public water supply. BASE FLOOD ELEVATION - means the flood having a one -percent chance of being equaled or exceeded in any given year. Also referred to as the 100-year flood. BASEMENT - means any area of the building having its floor subgrade (below ground) on all sides. BEST AVAILABLE INFORMATION - means in the absence of official flood insurance rate map data, the City can use data from federal, state, or other sources provided this data has either been generated using technically defensible methods or is based on reasonable historical analysis and experience. BIORETENTION - means a stormwater best management practice consisting of a shallow landscaped depression designed to temporarily store and promote infiltration of stormwater runoff. Bioretention may take the form of a cell, swale, or planter. BOLLARD - means a post used to prevent vehicle access. BOND/SURETY - means a surety bond, cash deposit, escrow account, any assignment of funds, irrevocable letter of credit, or other means acceptable to the Director to guarantee acceptable performance, execution, and completion of the work, in accordance with the project's approved plans and in accordance with all applicable governmental requirements. CBD - Central Business District. CDF - Controlled density fill. CFR -Code of Federal Regulations. CITY - means the City of Tukwila or the City Council of Tukwila. CLEARING - means the removal of vegetation from a site by physical, mechanical, chemical, or other means. This does not mean landscape maintenance or pruning consistent with accepted horticultural practices that do not impair the health or survival of trees and vegetation. COMPREHENSIVE PLAN - means a plan adopted by the City Council to guide the physical growth and improvement of the City and urban growth management area, including any future amendments and revision. CONVEYANCE SYSTEM - means natural and man-made drainage features that collect, contain, and convey surface water. Natural drainage features include swales, streams, rivers, lakes, and wetlands. Man-made features include gutters, ditches, pipes, and detention/retention facilities. CRITICAL DRAINAGE AREA - means any drainage basin having erosion, flooding or water quality issues as documented in the Comprehensive Surface Water Management Plan or drainage basin studies. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 42 CRITICAL FACILITY - means any structure for which even a slight chance of flooding is too great, such as schools, nursing homes, hospitals, police, fire and emergency response installations, and installations which produce, use, or store hazardous materials or hazardous waste. CROSS -CONNECTION - means any physical arrangement whereby a public water supply is connected, directly or indirectly, with any other water supply system, sewer, drain, conduit, pool, storage reservoir, plumbing fixture, or other device which contains or may contain contaminated water, sewage, or other wastes or liquids of unknown or unsafe quality, which may be capable of imparting contamination to a public water supply. DEDICATION - means the deliberate appropriating of land by an owner(s) for any general and public uses, reserving to themselves no other rights than such as are compatible with the full exercise and enjoyment of the public uses to which the property is to be devoted. The intent to dedicate will be evidenced presentation of a deed. DETENTION STRUCTURE - means a permanent structure designed to store runoff and discharge storage at controlled rates. DEVELOP LAND - means to change the runoff characteristics of a parcel of land. DEVELOPER - means the applicant for a development permit, his successors, and/or assignees. DEVELOPER AGREEMENT - means an agreement between the City and the Developer, which contains work descriptions, estimated costs, responsibilities for the work performance and an expiration date. DEVELOPER REIMBURSEMENT AGREEMENT - means an agreement between the City and a developer, who installed public improvements. The agreement provides for reimbursement of a fair prorated share by any real estate owners who have not contributed to the original cost of such facilities, and who subsequently connect to, or use the improvement. DEVELOPMENT - means any man-made change of improved or unimproved real estate,; the construction, reconstruction, conversion, structural alteration, relocation, or enlargement of any structure; any mining, excavation, landfill, clearing, or land disturbance; or any use or extension of the use of land. DIRECTOR - means the Director of the Public Works Department or designee, including the City Engineer and City inspectors. DNR - Department of Natural Resources. DOE - State Department of Ecology. DOH - State Department of Health. EASEMENT - means interest in land which does not include any rights of possession. A right of one owner of land to make lawful and beneficial use of the land of another created by an express or implied agreement. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 43 ELEVATED BUILDING - means for flood insurance purposes, a non -basement building which has its lowest elevated floor raised above ground level by foundation walls, shear walls, post, piers, pilings, or columns. ENGINEER, GEOTECHNICAL - means a practicing, professional civil engineer registered with the State of Washington, who has knowledge and practice of geotechnical engineering. ENGINEER, PROFESSIONAL - means an engineer, registered in Washington State. ENGINEER, SOILS - means Geotechnical Engineer. ENGINEERING GEOLOGIST - means a geologist certified by the State as experienced and knowledgeable in engineering geology. ENGINEERING GEOLOGY - means the application of geologic knowledge in the investigation and evaluation of naturally occurring rock and soil for use in the design of civil works. ENGINEERING, GEOTECHNICAL - means the application of soil mechanics in the investigation, evaluation, and design of civil works involving the use of earth materials and the inspection or testing of the construction thereof. ESC - Erosion prevention and sediment control. FBFM - Flood boundary/floodway map. FEMA - Federal Emergency Management Agency. FIRE MAIN - means a water line, at least 6 inch diameter, serving fire hydrants or fire protection systems. FIRM - Flood Insurance Rate Map. FLOOD INSURANCE RATE MAP (FIRM) - means the official map on which the Federal Insurance Administration has delineated both the areas of special flood hazards and the risk premium zones applicable to the City. FLOOD INSURANCE STUDY - means the official report and documents provided by the Federal Insurance Administration that includes flood profiles, the flood boundary-floodway map, and the water surface elevation of the base flood. FLOOD OR FLOODING - means a general and temporary condition of partial or complete inundation of normally dry land areas from the overflow of inland or tidal waters, and/or the unusual and rapid accumulation of runoff of surface waters from any source. FLOOD PLAIN - means any land area susceptible to flooding from any source. FLOOD PRONE - means any land area susceptible to flooding, not shown on FIRMs, designated as flood -prone by the Director, using best available information. FLOOD PROOFING - means any combination of structural and non-structural additions, changes, or adjustments to nonresidential structures, which reduce or eliminate flood damage to real estate or improved real property, water and sanitary facilities, structures, or their contents. For flood proofed nonresidential buildings, FEMA bases flood insurance premiums on rates that are one foot Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 44 f 1 below the flood -proofed level. For example, a building flood proofed to the base flood level will be rated as one foot below that level. FLOOD ZONE - means any area designated as special flood hazard or flood prone, or any area within the shoreline per Tukwila Municipal Code. FLOODWAY - means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot. FLOW ATTENUATION - means detaining or retaining runoff to reduce the peak discharge. FRONTAGE IMPROVEMENTS - means all of the street pavement, curb, gutter, sidewalk, transit bus shelters, bus pullouts, storm drainage, water and sewer utilities, power and communications cable undergrounding, street trees and street lighting, located within any public right-of-way abutting the property boundary of a development. FZCP - Flood Zone Control Permit. GRADING - means any act by which soil is cleared, stripped, stockpiled, excavated, scarified, filled, or any combination thereof. HALF STREET - means a street constructed utilizing at least half the regular width of the right-of-way and permitted as an interim facility pending construction of the other half. HDPE - high -density polyethylene. HEALTH OFFICER - means the Director of the South King County Department of Public Health or his duly authorized representative. HIGH USE SITE - means a commercial or industrial site that (1) has an expected average daily traffic (ADT) count equal to or greater than 100 vehicles per 1,000 square feet of gross building area, (2) is subject to petroleum storage or transfer in excess of 1,500 gallon per year, not including delivered heating oil, or (3) is subject to use, storage, or maintenance of a fleet of 25 or more diesel vehicles that are over 10 tons net weight (trucks, buses, trains, heavy equipment). Also included is any road intersection with a measured ADT count of 25,000 vehicles or more on the main roadway and 15,000 vehicles or more on any intersecting roadway, excluding projects proposng primarily pedestrian or bicycle use improvements. IMPERVIOUS SURFACE - means any surface that cannot be effectively and easily penetrated by water; a hard surface that either prevents or restricts the entry of water into the soil mantle or causes water to run off the surface in greater quantities or at an increased flow rate compared to natural conditions prior to development. Impervious surfaces include roof tops, paved areas, gravel roads, packed earthen surfaces, oiled surfaces, and macadam. Open, uncovered flood control, or water quality facilities are not considered impervious surfaces. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 45 IMPROVEMENTS - means any improvement to public, real, or personal property, including but not limited to, installation of streets, roads, pedestrian/bike facilities, streetlights; landscape features; sewer and waterlines; bridge structures; storm drainage facilities; and traffic control devices. INFILTRATION - means the passage or movement of water into the soil subsurface. INTERCEPTOR - means a sewer that receives flow from a number of main or trunk sewers, force mains, etc. KCSWDM - the adopted King County Surface Water Design Manual. LEVEE - means a man-made structure, designed and constructed in accordance with sound engineering practices to contain, control, or divert water flow for protection from flooding. LEVEL III CERTIFICATION - means a National Institute For Certification in Engineering Technologies, fire protection engineering technology certificate of competency, to design and install fire protection systems including underground backflow prevention devices and associated thrust blocking. LOCAL IMPROVEMENT - means a public improvement provided to a specific area benefiting that area and usually paid for by a special assessment for the benefit of property owners. LOWEST FLOOR (flood control definition) - means the lowest floor of the lowest enclosed area (including basement). If an unfinished or flood resistant enclosure is used solely for vehicle parking, building access, or storage, if this enclosure is in an area other than a basement, and if this enclosure is built so that the structure meets the applicable non -elevation design requirements for nonresiaiential construction, the enclosure is not considered the structure's lowest floor. MANUFACTURED HOME (flood control definition) - means a structure, transportable in one or more sections, built on a permanent chassis and designed for use with or without a permanent foundation when attached to the required utilities. The term "manufactured home" does not include a "recreational vehicle." MANUFACTURED HOME PARK OR SUBDIVISION (flood control definition) - means a parcel (or contiguous parcels) of land divided into two or more manufactured home lots for rent or sale. MANUFACTURED HOME PARK OR SUBDIVISION, EXISTING - means a manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before 1981, the effective date of the Tukwila's original floodplain management regulations. MANUFACTURED HOME PARK OR SUBDIVISION, EXPANSION TO AN EXISTING - means the preparation of additional sites by the construction of facilities for servicing the lots on which the manufactured homes are to be affixed, including the Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 46 installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads. MEAN SEA LEVEL (flood control definition) - means the National Geodetic Vertical Datum (NGVD) of 1929 to which the base flood elevations shown on the Flood Insurance Rate Map are referenced. METER - means a water measuring device approved by the Director. METER, DEDUCT - means a meter for water supply that does not discharge to the public sewer. The Permittee provides, owns, installs, and maintains the meter. This meter is installed downstream of a permanent water meter. An example is landscape irrigation. METER, PERMANENT - means meter for domestic water supply of all new or reestablished services when sewer discharge rates are calculated based on water usage. Each individual building requires a separate water main tap. The Permittee pays for a City -provided water meter. METER, TEMPORARY - means a water meter rented from the City for use of public water, on a short term basis, where a metered supply does not already exist. The Permittee rents the meter from the City. Examples include dust suppression during construction or water supply during hydroseeding. METER, WATER ONLY - Required for a separate service from the main that will not discharge to the public sewer. The Permittee pays for a City -provided water meter. MULTIFAMILY - means, in reference to development, the construction of a building or buildings to house two or more families living independently of each other. MUTCD - Manual on Uniform Traffic Control Devices. NAD - means North American Datum, horizontal, of 1983/1991. NAVD - means North American Vertical Datum. NEW CONSTRUCTION (flood control definition) - means structures for which the "start of construction" commenced on or after 1981, the effective date of Tukwila's original floodplain management regulations. NEW MANUFACTURED HOME PARK OR SUBDIVISION - means a manufactured home park or subdivision for which the construction of facilities, including streets, utilities, concrete pads, is completed on or after 1988, the effective date of Tukwila's original floodplain management regulations. NFIP - National Flood Insurance Program. NGVD - National Geodetic Vertical Datum of 1929. NICET - National Institute for Certification in Engineering Fundamentals. NPDES - National Pollutant Discharge Elimination System. OSHA - Occupational Safety and Health Administration. PERFORMANCE GUARANTEE - means a financial guarantee in a form acceptable to the City Attorney, ensuring all improvements, facilities, or work will be Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 47 completed in compliance with regulafons, and approved plans and specifications. PERMEABLE PAVEMENT - means a pervious concrete, porous asphalt, permeable pavers or other forms of pervious or porous paving material intended to allow passage of water through the pavement section. It often includes an aggregate base that provides structural support and acts as a stormwater reservoir. PERMITTEE - means any person, governmental agency, or other entity that is performing, or plans to perform, permitted work within the City. PLANS - means the plans, profiles, cross sections, elevations, details, and supplementary specifications, signed by a licensed professional engineer and approved by the Director, showing the location, character, dimensions, and details of the work to be performed. POLLUTION - means contamination or other alteration of the physical, chemical, or biological properties of waters of the state that will or is likely to create a nuisance or render waters harmful, detrimental, or injurious 1) to public health, safety, or welfare, or 2) to domestic, commercial, industrial, agricultural, recreational, or other legitimate beneficial uses, or 3) to livestock, wild animals, birds, fish, or other aquatic life. Contamination includes discharge of any liquid, gas, or solid, radioactive or other substance. Alteration includes temperature, taste, color, turbidity, or odor. PROJECT - means activity encompassing all phases of the work to be performed and is synonymous to the term "improvement" or "work." PW - means Public Works Department. RECREATIONAL VEHICLE - means a vehicle which is: (a) Built on a single chassis; (b) 400 square feet or less when measured at the largest horizontal projections; (c) Designed to be self-propelled or permanently towable by a light duty truck; and, (d) Designed primarily for use as temporary living quarters for recreational, camping, travel, or seasonal use. REDEVELOPMENT PROJECT - means a project that adds, replaces, or alters exterior impervious surface on a site that already has 35% or impervious surface. RETENTION STRUCTURE - means a permanent structure that provides for the storage of runoff by means of a permanent pool of water. RIGHT-OF-WAY - means (1) a strip of land acquired by reservation, dedication, forced dedication, prescription, or condemnation and intended to be occupied by a road, crosswalk, railroad, electric transmission lines, oil or gas pipeline, water line, sanitary sewer, storm sewer, or other similar public Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 48 accesses or public uses; and (2) the right of one to pass over The property of another. ROAD - means street. RPPA - Reduced pressure principle assembly (formerly Reduced Pressure Backflow Assembly). SAO - Sensitive Areas Overlay. SEDIMENT - means soils or other materials transported or deposited by the action of wind, water, ice, or gravity. SENSITIVE AREA - means wetland, watercourse, landslide hazard area, or abandoned coal mine as designated or defined by the City's Sensitive Areas Ordinance. SENSITIVE AREA, CLASS 2 - means an area where landslide potential is moderate, including areas sloping between 20% and 40%, and which are underlain by relatively permeable soils. SENSITIVE AREA, CLASS 3 - means an area where landslide potential is high, including areas sloping between 20% and 40%, and which are underlain by relatively impermeable soils or by bedrock, and which also include all areas sloping more steeply than 40%. SENSITIVE AREA, CLASS 4 - means areas, where landslide potential is very high, which include sloping areas with mapable zones of groundwater seepage, and which also include existing mapable landslide deposits regardless of slope. SEPA - State Environmental Policy Act. SEWER, LATERAL - means the portion of the sewer line extending from the City's main to the building, having no other common sewers discharging into it. A lateral sewer is operated and maintained by the property owner. Sometimes called a side sewer. SEWER, MAIN or TRUNK - means a sewer that receives flow from one or more mains. SEWER, MAIN EXTENSION - means the portion of the sewer line extending for more than 150 feet from the City's main. Lateral sewer connections are made to the sewer main extension. SEWER, PRIVATE - means that portion of the system located on private property where no easements are granted to the City. Private sewers include gravity laterals, building sewers, and sewer collection systems internal to developments; such as, apartment complexes, condominiums, townhouses, shopping centers, commercial office parks, mobile home parks, etc. A private sewer includes the portion of the lateral between the property line and sewer main. Maintenance of a private sewer will be the responsibility of the property owner(s). SEWER, PUBLIC - means that portion of the system located within rights -of -way or easements (excluding laterals) and is operated and maintained by the City. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 49 SEWER, STUB - means sewer, lateral. SHALLOW FLOODING AREA - means a designated AO, or AH zone on the Flood Insurance Rate Map (FIRM). The base flood depths range from one to three feet; a clearly defined channel does not exist; the path of flooding is unpredictable and indeterminate; and, velocity flow may be evident. AO is characterized as sheet flow and AH indicates ponding. SIDEWALK - a paved, surfaced, or leveled area, paralleling and usually separated from the street and normally used as a pedestrian walkway. SITE - means any tract, lot, or parcel of land, or combination of tracts, lots, or parcels of land which are in one ownership, or are contiguous and in diverse ownership, where development is to be performed as a part of a unit, subdivision, or project. SITE PLAN - means the development plan for one or more lots on which is shown the existing and proposed conditions of the lot, topography, vegetation, drainage, flood plains, walkways; means of ingress and egress; circulation; utility services; structures and buildings; signs and lighting; berms, buffers, and screening devices; surrounding development; and any other information that reasonably may be required in order that an informed decision can be made by the reviewing authority. SPECIAL FLOOD HAZARD AREA - means the land in the flood plain subject to a one - percent or greater chance of flooding in any given year. Also called the 100- year flood elevation or the base flood elevation. These areas are designated on Flood Insurance Rate Maps (FIRMs) using the letters A or V. Special flood hazard areas include flood prone areas designated by the City. STABILIZATION - means the prevention of soil movement by any various vegetative and/or structural means. STANDARDS - means the City of Tukwila Development Guidelines and Design and Construction Standards. START OF CONSTRUCTION - includes, for flood insurance purposes, substantial improvement, and means the date the building permit was issued, provided the actual start of construction, repair, reconstruction, placement or other improvement occurred within 180 days of the permit date. The actual start means either the first placement of permanent construction of a structure on a site, such as the pouring of slab or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; nor does it include the installation on the property of accessory buildings, such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of construction means the first alteration of any wall, ceiling, floor, Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 50 or other structural part of a building, whether or not that alteration affects the external dimensions of the building. STORM DRAINAGE PLAN - means a set of drawings and documents submitted as a prerequisite to obtaining a development permit. The plan contains all of the information and specifications pertaining to surface water management onsite and offsite. STREET, ARTERIAL - means a street that connects access streets to higher classifications. STREET, CUL-DE-SAC - means a street with a single common ingress and egress and with a circular turnaround at the end. STREET FRONTAGE - means either the area between any lot lines that intersect, and the area of a lot that directly abuts the boundary of a public or private street right-of-way. STREET, PRIVATE - means a street, built to City standards, but is not owned, nor maintained by the City. A private street is a street the City or other governmental entity has not accepted for ownership or maintenance. This does not include private access road as defined in the Subdivision code. STREET, PUBLIC - means a public right-of-way, usually containing improved facilities for transportation and utilities. A public street is a publicly owned and maintained street that serves more than four lots or is longer than 200 feet. STRUCTURE (flood control definition) - means, for flood plain management, a manufactured home or a walled and roofed building, including a gas or liquid storage tank, that is principally above ground. Structure, for insurance purposes, means a manufactured home, or a walled and roofed building, except a gas or liquid storage tank, that is principally above ground. (CFR 59.1) SUBSTANTIAL DAMAGE - means damage of any origin sustained by a structure whereby the cost of restoring the structure to it's before damaged condition would equal or exceed 50 percent of the market value of the structure before the damage occurred. SUBSTANTIAL IMPROVEMENT (flood control definition) - means any repair, reconstruction, rehabilitation, addition, or other improvement of a structure, the cost of which equals or exceeds 50 percent of the assessed value of the structure either: 1. Before the improvement or repair is started, or 2. Before damage occurred, if the structure is being restored. For the purposes of this definition, "substantial improvement" occurs when the first alteration of any wall, ceiling, floor, or other structural part of the building commences, whether or not that alteration affects the external dimensions of the structure. "Substantial improvement" does not include: Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 51 1. Any improvement of a structure to comply with existing state or local health, sanitary, or safety code specifications which is solely necessary to assure safe living conditions, nor 2. Any alteration of a structure listed on the national Registry of Historic Places or a state inventory of historic places. SURVEYOR - means any Washington State licensed professional land surveyor. TMC - Tukwila Municipal Code. TRAFFIC IMPACT ANALYSIS - means a report analyzing anticipated roadway conditions with and without proposed development, including an analysis of mitigation measure and a calculation of fair share financial contributions. TYPICAL - means the guidelines that shall be followed unless the Director approves a variation. UTILITY - means a company providing public service including, but not limited to, gas, oil, electric power, street lighting, telephone, telegraph, water, sanitary sewer, storm drainage, solid waste, or cable television, whether or not such company is privately owned or owned by a governmental entity. VACATION - means the process by which public right-of-way becomes private property. VARIANCE - means a grant of relief by the City for activities that would otherwise be prohibited by the TMC. WAC - Washington Administrative Code. WDFW - Washington Department of Fish and Wildlife WISHA - Washington Industrial Safety and Health Administration. WSDOT - Washington State Department of Transportation. ZONE "A" - means a zone on the Flood Insurance Rate Map (FIRM) where flooding is known to occur, but no flood elevation has been determined. ZONE "AH" - means a zone on the Flood Insurance Rate Map (FIRM) characterized by base flood depths from one to three feet; having no clearly defined channel or having an unpredictable and indeterminate channel, where velocity flow may be evident. AH indicates ponding. ZONE "AE" - means a zone on the Flood Insurance Rate Map (FIRM) where base flood elevations are determined and are shown on the map. Tukwila Proposed Amended IDCS and Standard Details Draft, August 5, 2016 Page 52 Tukwila Proposed Amended IDCS " >tandard Details Draft, August 5, 2016 Page 53 PATH: K:\project\32600\32634\CARD\AGD\Dwq\CAD Detals.dwg PLOT DATE: 7/15/I6 2'-0" 8' 6" 6' 6° 6' 0' 336' CLASS 8 CONCRETE - 3' CLR 1'-0' MIN. - / �UNDISTURBED EARTH OR COMPACTED flu FOUNDATION PLAN 1" ♦ A307 ANCHOR eat 1y° CLR FACE OF CURB 0 TOP #5 0 18" O.X. W/HOOK EACH END, LONG D4IENSION ONLY BOTTOM /5 0 6' O.C. EACH WAY W/ HOOK EACH END. EXISTING CURB & GUTTER _, GROUND ROD NOTES: tY 0 PVC CONDUIT FOUNDATION SECTION 6' RADIUS 12' MIN, 1. THE FOUNDATION SHOWN IS SPECIFICALLY DESIGNED FOR A "HAPCO TYPE" ALUMINUM POLE UP TO 30' MOUNTING HEIGHT AND 8' MAST ARM. 2. CONCRETE FOR FOUNDATION SHALL BE CLASS B, 3000 PSI COMPRESSIVE STRENGTH AT 28 DAYS. USE OF PERVIOUS CONCRETE IS PROHIBITED WITHIN FOUNDATION. 3. REINFORCING STEEL SHALL CONFORM TO MINIMUM REQUIREMENTS OF ASTM A615 GRADE 60. 4. CONTACT CITY OF TUKWILA FOR SECONDARY VOLTAGE AND GROUND WIRE CONNECTION. 5. FOR SERVICE CONNECTION, CONTACT PROVIDER AT LEAST TWO WORKING DAYS IN ADVANCE. 6. ALL PERMANENT CONDUCTORS SHALL BE COPPER. ALL ELECTRICAL WORKMANSHIP AND MATERIALS SHALL CONFORM TO NATIONAL ELECTRICAL CODE REQUIREMENTS. NOT TO SCALE City of Tukwila LUMINAIRE SHEET: RS-25 REVISION #1: LAST REVISION: APPROVAL: Tukwila Proposed Amended IDCE Standard Details Draft, August 5, 2016 Page 54 0 a i RAMP WITH 12H:1V SLOPE (TYP.) `°`•..` ♦. ° `• TWO -TRACK RIBBON DRIVEWAY `.+• CEMENT CONCRETE SIDEWALK 5' CEMENT CONCRETE 6• CURB AND GUTTER ( , 3/JOINT 8� EXPANSION PLAN VIEW CEMENT CONCRETE DRIVEWAY RIBBON ENTRANCE VARIES , FLUSH 1/27 R (TYP.) / DRIVEWAY - 6' 3/8' MIN. 5' VARIES j EXPANSION JOINT (TYP.) SECTION 2% MAX 6° A DEPRESSED CURB AND GUTTER CEMENT CONCRETE MAXIMUM 150' SIDEWALK RIBBON LENGTH TWO • ♦ f` -TRACK RIBBON DRIVEWAY ®♦ ` ` , ` ` °.. GRASS CEMENT CONCRETE CURB AND GUTTER • r ,./ • DEPRESSED CURB AND GUTTER Ntili RAMP WITH 12H:1V SLOPE (TYP.) PoBBON - ISOMERIC VIEW NOTES: 1. THIS ALTERNATE SHOULD BE USED ONLY AFTER STUDYING CLOSENESS OF DRIVEWAYS, DRAINAGE, TOPOGRAPHY, DRIVEWAY GRADES, ETC. 2. CONCRETE SHALL BE CLASS 4000. 3. INSPECTION REQUIRED BEFORE PLACING CONCRETE. AT LEAST 24 HOUR NOTICE MUST BE GIVEN TO TUKWILA PUBLIC WORKS DEPARTMENT. 4. ALL DRIVEWAY APRONS SHALL BE A MINIMUM OF 6" THICK. 5. ALL WORK SHALL BE PERFORMED IN ACCORDANCE WITH APA/WSDOT PLANS AND SPECIFICATIONS OR AS DIRECTED BY THE CITY OF TUKWILA. 6. AN ASPHALT APRON MAY BE USED IN AREAS WHERE NO CURB EXISTS. 7. REMOVAL OF EXISTING CONCRETE CURB, GUTTER OR SIDEWALK SHALL BE SAW CUT TO THE NEXT CONSTRUCTION JOINT. NOT TO SCALE 04. A9� './ x d 'c1 `�s+ tl� y 1908 City of Tukwila RIBBON RESIDENTIAL DRIVEWAY TBD SHEET: REVISION #1: LAST REVISION: APPROVAL: Tukwila Proposed Amended IDCS / itandard Details Draft, August 5, 2016 Page 55 TOP OF - \ CURB 1 6" 12" A MODIFIED METAL INLET ASSEMBLY DEPRESSED GUTTER 2" AT OPENING NOTES: 24" WALL 18"-- 4 4 MODIFIED METAL INLET (SEE DETAIL B & SW-334) TOP OF WALL SLOPED TO DRAIN SECTION A -A VARIES CONCRETE SPLASH PAD 4- 12" 4 4 DETAIL A - INLET PLAN 18" 44 CONCRETE SPLASH PAD LEVEL WITH SOIL %4" 1 15" CONCRETE SPLASH PAD 4' 4, CURB W THICKENED CURB AND GUTTER PER STANDARD DRAWING P-5433 2' DEPRESSION BELOW EXISTING CUTTER DETAL B - INLET TO BIORETENTION CURB EXTENSION 1. ADDITIONAL CONCRETE INLETS, CAN BE ADDED IF NECESSARY (PREFERABLY IMMEDIATELY DOWNSTREAM OF EACH CHECK DAM TO MINIMIZE POTENTIAL BACKFLOW). 2. SAWCUT BEYOND FACILITY AND TRANSITION EXISTING CURB TO NEW CURB AND GUTTER AT 1" PER FOOT AS NECESSARY. 3. INLET MAY BE MODIFIED TO MAXIMIZE FLOW ENTRY TO STORMWATER FACILITY. 4. MODIFY INLET AND OUTLET DESIGN AS NEEDED FOR SITE. 5. ENSURE OUTLET NOTCH ELEVATION IS 2" BELOW LOWEST INLETS AND SIDEWALK NOTCHES. 6. CONCRETE SPLASH PAD REQUIRED AT ALL INLETS. NOT TO SCALE City of Tukwila INLET TO BIORETENTION CURB EXTENSION TBD SHEET: REVISION #1: APPROVAL: LAST REVISION: Tukwila Proposed Amended IDCF/ Standard Details Draft, August 5, 2016 Page 56 r a K:\project\32600\32634\CADO\ACAD\Dwg\CAD Details.dwg PLOT DATE: 7/15/16 CURB NOTES: BIORETENTION AREA 4, 4, W y� 4,4, 4, 4, \11 4, 3H:1V 4, 6- WIDE TRENCH DRAIN y W W 'Y 3H:TV W 4, di W CEAK=NT CONCRETE SIDEWALK W W 4, CEMENT CONCRETE CURB AND GUTTER DETAIL A - BIORETENT1ON TRENCH DRAIN DETAIL OUTLET NOTCH (SEE DETAIL D) WALL DETAIL B - OUTLET FROM BIORETENTION CURB EXTENSION 12" 4 6- DESIGNER INFO, SEE NOTE 5 DETAIL C - OUTLET NOTCH SECTION VIEW 1. SAWCUT BEYOND FACILITY AND TRANSITION EXISTING CURB TO NEW CURB AND GUTTER AT 1" PER FOOT AS NECESSARY. 2. MODIFY INLET AND OUTLET DESIGN AS NEEDED FOR SITE. 3. ENSURE OUTLET NOTCH ELEVATION IS 2" BELOW LOWEST INLETS AND SIDEWALK NOTCHES. 4. CONCRETE SPLASH PAD REQUIRED AT ALL INLETS. NOT TO SCALE City of Tukwila TRENCH DRAIN INLET AND OUTLET FROM BIORETENTION CURB EXTENSION TBD SHEET: REVISION #1: LAST REVISION: APPROVAL: I Tukwila Proposed Amended IDCS( Standard Details Draft, August 5, 2016 f� Page 57 PATH: K:\project\32600\32634\CADO\ACAD\Dwg\CAD Oetails.dwg PLOT DATE: 7/15/16 TOP OF ROADWAY CURB AND GUTTER NOTES: 6' WIDE SIDEWALK MAX. (SEE NOTE) 2% MAX 1' WIDE SHOULDER MAX. CONCRETE SIDEWALK TYPICAL SECTION 10' MIN. PROPERLY UNE VEGETATED FLOWPATH (SEE NOTE) 1. THE EDGE OF THE SIDEWALK AND THE GROUND ADJACENT TO OR IMMEDIATELY BELOW THE EDGE MUST BE EITHER LEVEL OR SLOPED SUCH THAT THE DIRECTION OF SHEET FLOW IS PERPENDICULAR TO THE EDGE OR NO MORE THAN 45 DEGREES FROM PERPENDICULAR. 2. A 'VEGETATED FLOWPATH SEGMENT" OF AT LEAST 10 FEET IN LENGTH MUST BE AVAILABLE ALONG THE FLOWPATH THAT RUNOFF WOULD FOLLOW UPON DISCHARGE FROM THE SIDEWALK. VEGETATED FLOW PATH MUST MEET CRITERIA OF 2016 KING COUNTY SWDM C.2.41. 3. SIDEWALK LONGITUDINAL SLOPE SHALL BE 10% MAXIMUM. NOT TO SCALE City of Tukwila REVERSE SLOPE SIDEWALK SHEET: TBD REVISION #1: APPROVAL: LAST REVISION: Tukwila Proposed Amended IDCr ' Standard Details Draft, August 5, 2016 Page 58 4 b 3 6 1 1 1V-a' PICK 6 MY 10' 0' t f if. t +: 4 Y.i 4 •4. 4 k t•• i 4' 1 y 4 4 4 • 4 4 444 4 4 Nit 9• • • C t 4 • s4•43 4 4 4 4 4 4 s• 4 4 4' X4' X 3' UNCOVERED SOL 4'X 10' X3' COMM 9X once stowx) ,7)1 CLOSED SOIL VOLUME (UNDER SIDEWALK) 4' 0" 10' 0 15'-0" RIGHT OF WAY OPEN SOIL VOLUME 4'X4' MINIMUM TREE CUT OUT TOTAL SOIL VOLUME CALCULATION FOR TYPICAL STREET TREE: OPEN SOIL VOLUME = 4' X 4' X 3' = 48 CUBIC FEET CLOSED SOIL VOLUME = 24' X 10' X 3' = 720 CUBIC FEET TOTAL SOIL VOLUME = 768 CUBIC FEET (750 C.F. MIN. REQUIRED) MEET VIM aue VERTICAL CURB STREET NOT TO SCALE City of Tukwila SOIL VOLUME CALCULATION, TYP. STREET TREE SHEET: TBD REVISION 11: LAST REVISION: APPROVAL: / L ,- TITLE 16 — BUILDINGS AND CONSTRUCTION 11 CHAPTER 16.54 GRADING Sections: 16.54.010 Purpose 16.54.020 Authority 16.54.030 Definitions 16.54.040 Applicability 16.54.050 Permit 16.54.055 Permit Application Requirements 16.54.060 Standards 16.54.065 Erosion and Sediment Control Standards 16.54.070 Supplemental Information 16.54.075 Inspections 16.54.080 Hazard and Damage 16.54.085 Financial Guarantees 16.54.090 Exceptions 16.54.100 Penalties 16.54.120 Appeals 16.54.010 Purpose The provisions of TMC Chapter 16.54 shall be liberally construed to accomplish the following purposes: 1. Prevent damage to life, public and private property, surface waters, sensitive areas and associated buffers. 2. Regulate grading activities, including excavation, fill, grading, earthwork construction, and structural preloads. 3. Prevent erosion, and control sedimentation,_minimize disturbance, and restore the moisture holding capacity of soils. 4. Establish the standards to permit grading activities. 5. Provide for approval and inspection of grading activi- ties. (Ord. 2062 §1(part), 2009) 16.54.020 Authority A. The Public Works Director shall administer TMC Chapter 16.54. The Director's authority includes the estab- lishment of regulations and procedures, approval of permits and exceptions, inspection of work, and enforcement and im- plementation of measures necessary to carry out the intent of TMC Chapter 16.54. B. The Public Works Director may initiate all required ac- tions to prevent or stop acts or intended acts which the Direc- tor determines to constitute a hazard to life or safety, or en- danger property, or adversely affect the safety, use or stability of a public or private property or a sensitive area or its buffer. C. If the Director determines that a person is engaged in grading activities that do not comply with City code or with ap- proved permit plans and/or other permit conditions, the Direc- tor may implement any or all of the following enforcement ac- tions: 1. Suspend or revoke without written notice any grading activity, when the Director determines that activity poses an immediate danger to life, safety or property. 2. Serve a written notice of violation upon that per- son by registered or certified mail or personal service. The notice shall set forth the measures necessary to achieve com- pliance, specify the time to commence and complete correc- tions, and indicate the consequences for failure to correct the violation. 3. Suspend or revoke any City approval for grading activities after written notice is given to the Applicant for any of the following reasons: a. Any violation(s) of the permit or the permit conditions; b. Construction not in accordance with the ap- proved plans; or c. Non-compliance with correction notice(s) or "Stop Work Order(s)" issued for the construction of temporary or permanent storm water management facilities. 4. Post a "Stop Work Order" at the site, directing that all grading activities cease immediately. The "Stop Work Order" may include any discretionary conditions and standards adopted in TMC Chapter 16.54 that must be fulfilled before any work may continue. (Ord. 2062 §1(part), 2004) 16.54.030 Definitions As used in TMC Chapter 16.54, the terms shall be defined as follows: 1. —"Applicant" means any person who has applied for a grading permit. 2. "Bench" means a relatively level step excavated into earth material on which fill is to be placed. 23. 'Buffer" means the area contiguous to a sensitive area that is required for the continued maintenance, function and structural stability of the sensitive area as defined in the sensitive areas overlay. 4. "Compaction" means the densification of a fill or of existing soils by mechanical or other means, whether intentional or incidental. 5. "Cut" see "Excavation". 66. "Director" means the Public Works Director or his/her designee, including the City Engineer and Public Works inspectors. 7. "Down Drain" means a device for collecting water from a swale or ditch located on or above a slope and safely delivering it to an approved drainage facility. 8. — "Erosion" means the wearing away of land sur- face by the action of wind, water, gravity, or any combination thereof. 59. —"Excavation"-means -the digging or removal of earth material, also referred to as a cut. 610. — "Fill" means a deposit of material placed by artifi- cial means. 711. — "Geotechnical engineering" means the applica- tion of soil mechanics in the investigation, evaluation, and de- sign of civil works involving the use of earth materials and the inspection or testing of the construction thereof. 12. "Grade" means the vertical location of the ground surface. 13. "Grade, Existing" means the grade prior to grading. 14. "Grade, Finished" means the grade of the site at the conclusion of all grading efforts. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 1 TUKWILA MUNICIPAL CODE 815. "Grading" —means any activity that results in change of the cover or topography, or any activity that may cause erosion, including clearing, cxcavationcxcavatinq, filling, wing -and stockpiling. 16. "Key" means a compacted fill placed in a trench excavated in earth material beneath the toe of a slope. 817. "Sensitive area" means wetlands, watercourses, areas of potential geologic instability, abandoned coal mines, and fish and wildlife habitat areas, per the City's Sensitive Areas Ordinance. 4818. "Site" means any legally defined section of real property, whose boundaries are recorded with the King County Assessor's office for the purposes of assessing taxes. 19. "Slope" means an inclined surface, the inclination of which is expressed as a ratio of horizontal distance to vertical distance. 20. "Terrace" means a relatively level step constructed in the face of a graded slope for drainage and maintenance purposes. (Ord. 2062 §1(part), 2004) 16.54.040 Applicability A. TMC Chapter 16.54 applies to all grading activities within the City limits. B. Flood zone grading, excavation and earthwork con- struction, including fills and embankments, shall comply with the requirements of TMC Chapter 16.52. C. City departments shall comply with all the require- ments of TMC Chapter 16.54, except that they are not required to obtain permits and approvals from the City for work per- formed in the public right-of-way, nor for operation and main- tenance activities by the Department of Parks and Recreation. (Ord. 2062 §1(part), 2004) 16.54.050 Permit A. A permit is required for all grading activities occurring within the City limits, except the following: 1. Excavation for construction of a structure permit- ted under the International Building Code. 2. Cemetery graves. 3. Refuse disposal sites controlled by other regula- tions. 4. Excavations for wells, or trenches for utilities. 5._—Mining, quarrying, excavating, processing or stockpiling rock, sand, gravel, aggregate or clay controlled by other regulations, provided such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties. 6. Exploratory excavations performed under the di- rection of a registered design professional, as long as this ex- ploratory excavation does not constitute the beginning of con- struction of a building prior to obtaining a permit. B. Applications -for permits pursuant to TMC Chapter 16.54 shall be submitted to the City in the format and manner specified laythe-Direstefin TMG 16.54.055. C. An approved grading permit applies to one site. —A separate permit shall be obtained for each site. D. The City shall collect a nonrefundable permit fee, the Tukwila Proposed Amended Development Code Draft, August 8, 2016 amount set by resolution of the City Council. (Ord. 2062 §1(part), 2004) 16.54.055 Permit Application Requirements A. To obtain a permit, the applicant shall first file an application in writing on a form provided by or approved by the Director that shall include, at a minimum: 1. Identification and description of the work to be covered by the permit for which application is made. 2. An estimate of the quantities of excavation and fill involved by volume and the total area cleared or graded in square feet and as a percentage of the total site area. 3. Identification and description of: a. all critical areas on the site or visible from the boundaries of the site; and b. property -specific development standards and special district overlays. 4. Location of any open space tracts or conservation easements. 5. Plans and specifications that, at a minimum, include: a. property boundaries, easements and setbacks. b. a 1:2000 scale vicinity map with a north arrow. c. horizontal and vertical scale. d. size and location of existing improvements on and within fifty feet of the project, indicating which will remain and which will be removed. e. location of all proposed cleared areas. f. existing and proposed contours at maximum five foot intervals, and extending for one hundred feet beyond the protect edge, providing sufficient detail to identify how grade changes will conform to the requirements of this code. q. at least two cross sections, one in each direction, showing existing and proposed contours and horizontal and vertical scales. h. a proposed erosion and sediment control plan as required by TMC 16.54.065. 6. A geotechnical report prepared by a registered geotechnical engineer that, at a minimum, includes: a. the nature and distribution of existing soils. b. conclusions and recommendations for grading procedures. c. soil design criteria for any structures or embankments required to accomplish the proposed grading. d. where appropriate, slope stability studies, and recommendations and conclusions regarding site geology. Exception: A geotechnical report is not required where the Director determines that the nature of the work applied for is such that a report is not necessary. 7. For sites with mapped maximum considered earthquake spectral response accelerations at short periods (Ss) greater than 0.5q as determined by the adopted International Building Code, Section 1613, a study of the liquefaction potential of the site shall be provided, and the recommendations incorporated in the plans. Exception: A liquefaction study is not required where the Director determines from established local data that the Page 2 /.` TITLE 16 — BUILDINGS AND CONSTRUCTION liquefaction potential is low. B. Materials in addition to those required in subsection A. of this section may be necessary for the Director to complete the review. The following materials shall be submitted when required by the Director: 1. Higher accuracy contours and more details of existing terrain and area drainage, limiting dimensions, elevations or finished contours to be achieved by the grading, and proposed drainage channels and related construction. 2. If applicable, all drainage plans and documentation consistent with TMC Chapter 14.30 and the Surface Water Design Manual, as adopted in accordance with TMC Chapter 14.30. 3. Studies prepared by qualified specialists, as necessary to substantiate any submitted materials and compliance with this chapter or other law, particularly if clearing or grading is proposed to take place in or adjacent to an environmentally sensitive area. C. Plans and specifications shall be prepared and signed by a civil engineer if they are prepared in conjunction with the proposed construction or placement of a structure, include permanent drainage facilities or, if _required by the Director, propose alterations in steep slope or landslide hazard areas. D. The Director shall determine the number of copies of the required plans, specifications and supporting materials necessary to expedite review and may require submittal of materials in alternative formats. E. The Director may waive specific submittal requirements if they are determined to be unnecessary for the acceptance and subsequent review of an application. F. Any plans, specifications, or supporting materials that are returned as a result of permit denial or any other reason shall be returned to the applicant. 16.54.060 Standards A. All grading activities require erosion prevention and sediment control in accordance with TMC 16.54.065 and commensurate with the degree of risk, as determined by the Director. B. All grading activities shall be undertaken according to the following mandatory standards: 1. All design and construction shall be performed to minimize soil disturbance, to minimize compaction where not required for structural stability, and to maximize erosion prevention and sediment control. 2. All grading activities shall be consistent with: a. The standards given in this chapter. ab. The International Building Code, Chapter 18 and Appendix J. Appendix J is hereby adopted by reference, except as amended in TMC 16.51.050, and as may be amended from time to time. b. The Public Works Department's Development Guidelines and Design and Construction Standards. c. The #fig -Cody -Surface Water Design Ma- nual,_ Appendix D, and as may be amended from time to time.. as adopted in accordance with TMC Chapter 14.30. d. Tukwila Municipal Code Chapter 18.45, Tukwila Proposed Amended Development Code Draft, August 8, 2016 "Environmentally Sensitive Areas." e. Policies and procedures set forth by the Di- rector. (Ord. 2062 §1(part), 2004) C. Cuts and fills shall conform to the following provisions unless otherwise approved by the Director: 1. A slope of cut and fill surfaces shall not be steeper than is safe for both the intended use and soil type and shall not exceed two horizontal to one vertical (50-percent slope) unless the owner or authorized agent furnishes a geotechnical report justifying a steeper slope. The following exceptions can be made for cut surfaces: a. A cut surface shall be permitted to be at a slope of 1.5 horizontal to one vertical (67-percent slope) provided that all of the following are met: 1) it is not intended to support structures or surcharges. 2) it is adequately protected against erosion. 3) it is no more than 8 feet in height. 4) it is approved by the Director. 5) ground water is not encountered. b. A cut surface in bedrock shall be permitted to be at a slope of one horizontal to one vertical (100-percent slope); 2. All disturbed areas including faces of cuts and fill slopes shall be prepared and maintained to control erosion in compliance with TMC 16.54.065. Erosion control for the slopes shall be installed as soon as practicable and prior to call for final inspection. Where necessary, check dams, cribbing, riprap or other devices or methods shall be employed to control erosion and provide safety. 3. The ground surface shall be prepared to receive fill by removing unsuitable material such as concrete slabs, tree stumps, brush, vegetation, topsoil, car bodies and other materials as determined by the Director, and scarifying the ground to provide a bond with the fill material. 4. Except in an approved sanitary landfill, as part of engineered fill, as part of public infrastructure, as part of a stormwater facility or lawn or landscaping, or as approved by the Director, fill material shall meet the following standards: a. Fill material shall consist of earthen material, organic material or recycled or reprocessed materials that are not categorized as dangerous waste under Title 173 WAC and that were produced originally from an earthen or organic material. b. Fill material shall have a maximum dimension of less than twelve inches. c. Recycled concrete shall be free of rebar and other materials that may pose a safety or health hazard. d. Recycled asphalt shall not be used in areas subject to exposure to seasonal or continual perched ground water, in a critical aquifer recharge area or over a sole -source aquifer. e. Recycled materials that have not been reprocessed to meet the definition of common borrow in the latest WSDOT Standard Specifications shall be intermixed with well-qraded, natural, earthen materials in sufficient quantities Page 3 TUKWILA MUNICIPAL CODE and of a suitable size to assure filling of all voids and to assure that the fill can be compacted to ninety percent of the maximum density. 5. Provisions shall be made to: a. prevent any surface water or seepage from damaging the cut face of any excavation or the sloping face of a fill. b. address any surface water that is or might be concentrated as a result of a fill or excavation to a natural watercourse in accordance with TMC Chapter 14.30 and the Surface Water Design Manual. 6. Benches and any swales or ditches on benches shall be designed in accordance with the Surface Water Design Manual. 7. All cut and fill slopes shall meet the following setback requirements: a. Cut and fill slopes shall be set back from property lines as shown in Figure 16-6, Drainage Dimensions, to preserve the safety of adiacent properties, provide for adequate foundation support, prevent damage from runoff or erosion of the slopes, and preserve the permitted uses on the adjacent properties, unless substantiating data is submitted justifying reduced setbacks. Setback dimensions shall be measured perpendicular to the property line. b. The setback at the top of a cut slope shall not be less than shown in Figure 16-6, Drainage Dimensions, or than is required to accommodate any required interceptor drains, whichever is greater. c. Where required to protect adiacent properties at the toe of a slope from adverse effects of the grading, additional protection, approved by the Director shall be included. Such protection may include but shall not be limited to: 1) setbacks greater than those required by Figure 16-6, Drainage Dimensions. 2) provisions for retaining walls or similar construction. 3) erosion protection of the fill slopes. 4) provision for the control of surface waters. 8. Fill shall meet the following standards: a. Fill greater than 18 inches in depth shall be engineered and compacted to accommodate the proposed use in accordance with the applicable standard unless a notice on title documenting the location of the fill is recorded and the fill is sufficiently stable to not pose a hazard, as follows: 1) Fill material at the location of proposed buildings shall be compacted to 90 percent of maximum density as determined by ASTM D 1557, Modified Proctor, in lifts not exceeding 12 inches in depth, unless another compaction is recommended in the geotechnical report. 2) Fill material at the location of proposed public infrastructure, such as streets and roads, shall be compacted in accordance with the Infrastructure Design and Construction Standards. 3) Fill material, including imported soils and compost, at the location of a proposed stormwater facility or Tukwila Proposed Amended Development Code Draft, August 8, 2016 placed as part of earthwork construction of a stormwater facility shall be compacted in accordance with the Surface Water Design Manual and TMC 14.30. 4) Fill material at the location of proposed landscape areas, including lawn, shall be compacted in accordance with TMC 16.54.060(1). b. Where existinq grade is at a slope steeper than five horizontal to one vertical (20-percent slope) and the depth of the fill exceeds 5 feet benching shall be provided in accordance with Figure 16-5, Benching Details. A key shall be provided which is at least 10 feet in width and 2 feet in depth. c. Any fill in the floodplain shall, from the face of the fill to a horizontal distance of six feet back from the face, meet the compaction requirements for pond embankments in the Surface Water Design Manual, unless determined by the department that inundation is not a threat to fill integrity. D. Access roads to grading sites shall be: 1. Maintained and located to the satisfaction of the Director to minimize problems of dust, mud and traffic circulation. 2. Located where the permanent access to the site is proposed in the permit application to minimize site disturbance. 3. Controlled by a pate when required by the Director. E. Signs warning of hazardous conditions, if determined by the Director to exist on a particular site, shall be affixed at locations as required by the Director. F. Where required by the Director, to protect life, limb and property, fencing shall be installed with lockable gates that must be closed and locked when not working on the site. The fence shall be no less than six feet in height and the fence material shall have no opening larger than two inches. G. Rocks, dirt, mud, vegetation, topsoil, duff layer and any other materials stripped from, imported onto, used or produced on -site in the course of permitted activities shall not be spilled onto, stockpiled, or otherwise left on public roadways or any off -site property not specifically authorized as a receiving site under a valid permit. H. The duff layer and native topsoil shall be retained in an undisturbed state to the maximum extent practicable. Any duff layer or topsoil removed during grading shall be stockpiled to the maximum extent practicable on -site in a designated, controlled area not adjacent to public resources and environmentally sensitive areas. The material shall be reapplied to other portions of the site where feasible. 1. The soil moisture holding capacity of the soil shall be restored as follows: 1. Except as otherwise provided in subsection 1.2. of this section, areas that have been cleared and graded shall have the soil moisture holding capacity restored to that of the original undisturbed soil native to the site to the maximum extent practicable. The soil in any area that has been compacted or that has had some or all of the duff layer or underlying topsoil removed shall be amended to mitigate for lost moisture -holding capacity. The amendment shall take place between May 1 and October 1. The topsoil laver shall be a minimum of eight inches thick, unless the applicant demonstrates that a different thickness will provide conditions equivalent to the soil moisture -holding capacity native to the site. The topsoil layer shall have an organic Page 4 ! TITLE 16 — BUILDINGS AND CONSTRUCTION matter content of between five to ten percent dry weiqht and a pH suitable for the proposed landscape plants. When feasible, subsoils below the topsoil layer should be scarified at least four inches with some incorporation of the upper material to avoid stratified layers. Compost used to achieve the required soil organic matter content must meet the definition of "composted materials" in WAC 173-350-220. 2. This subsection does not apply to areas that at project completion are covered by an impervious surface, incorporated into a drainage facility or engineered as structural fill or slope. J. Drainage and terracing shall be provided as follows, except where the ground slope is not steeper than three horizontal to one vertical (33-percent slope): 1. Terraces at least 6 feet in width shall be established at not more than 30-foot vertical intervals on all cut or fill slopes to control surface drainage and debris. Suitable access shall be provided to allow for cleaning and maintenance. Where more than two terraces are required, one terrace, located at approximately mid -height, shall be at least 12 feet in width. 2. Swales or ditches shall be provided on terraces. They shall have a minimum gradient of 20 horizontal to one vertical (5-percent slope) and shall be paved with concrete not less than 3 inches in thickness, or with other materials suitable to the application. They shall have a minimum depth of 12 inches and a minimum width of 5 feet. A single run of swale or ditch shall not collect runoff from a tributary area exceeding 13,500 square feet (projected) without discharging into a down drain. 3. Interceptor drains shall be installed along the top of cut slopes receiving drainage from a tributary width greater than 40 feet, measured horizontally. They shall have a minimum depth of 1 foot and a minimum width of 3 feet. The slope shall be approved by the Director, but shall not be less than 50 horizontal to one vertical. The drain shall be paved with concrete not less than 3 inches in thickness, or by other materials suitable to the application. Discharge from the drain shall be accomplished in a manner to prevent erosion and shall be approved by the Director. 4. Drainage across property lines shall not exceed that which existed prior to grading. Excess or concentrated drainage shall be contained on site or directed to an approved drainage facility. Erosion of the ground in the area of discharge shall be prevented by installation of nonerosive down drains or other devices. 16.54.065 Erosion and Sediment Control Standards A. A person who clears, grades or otherwise disturbs a site shall provide erosion and sediment control that prevents, to the maximum extent practicable, the transport of sediment from the site to drainage facilities, water resources and adjacent properties. Erosion and sediment controls shall be applied as specified by the temporary erosion and sediment control measures and performance criteria and implementation requirements in the Surface Water Design Manual. B. From October 1 through April 30, which is the seasonal limitation period, clearing and grading shall only be permitted if shown to the satisfaction of the Director that runoff leaving the construction site will comply with the erosion and sediment control measures and performance criteria and implementation requirements in the Surface Water Design Manual through a combination of the following: 1. Site conditions including vegetative coverage, slope, soil type and proximity to receiving waters; 2. Proposed limitations on activities and the extent of disturbed areas; and 3. Proposed erosion and sedimentation control measures. C. Based on the information provided under subsection A. of this section, the Director may expand or restrict the seasonal limitations on site disturbance. The Director shall set forth in writing the basis for approval or denial of clearing or grading during the seasonal limitation period. D. During the seasonal limitation period, clearing and grading will be allowed only if there is installation and maintenance of an erosion and sedimentation control plan approved by the Director that defines any limits on clearing and grading or specific erosion and sediment control measures required during the seasonal limitation period. The department may require or approve alternate best management practices. E. If, during the course of construction activity or soil disturbance during the seasonal limitation period, silt -laden runoff violating standards in the Surface Water Design Manual leaves the construction site or if clearing and grading limits or erosion and sediment control measures shown in the approved plan are not maintained, a Violation Notice and Order shall be issued in accordance with TMC 8.45.050. F. If the erosion and sediment control problem defined in the Violation Notice and Order is not adequately repaired within twenty-four hours of issuance, then a Stop Work Order may be issued in accordance with TMC 8.45.070 until such time as adequate erosion and sediment control measures to stop silt - laden runoff from leaving the site are installed. The Stop Work Order may also require the property owner to discontinue any further clearing or grading, except for erosion and sediment control maintenance and repair, until the following April 30. G. The following activities are exempt from the seasonal limitations of this section: 1. Routine maintenance and necessary repair of erosion and sediment control facilities. 2. Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in removal of the vegetative cover to the soil. 3. Activities where there is one hundred percent infiltration of surface water runoff within the site in approved and installed erosion and sedimentation control facilities. 4. Typical landscaping activities of existing single family residences that do not require a permit. 5. Class I, II III and IV special forest practices in accordance with chapter 76.09 RCW. 6. Response to emergencies that threaten the public health, safety or welfare. 16.54.070 Supplemental Information A. The Director may require supplemental studies, Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 5 TUKWILA MUNICIPAL CODE inspections, or testing by an approved testing agency to be performed at the owner's expense. B. The Director may require a Hold Harmless Agreement for activities in or near a sensitive area, or for a deviation from standards set forth in TMC 16.54,060. (Ord. 2062 §1(part), 2004) 16.54.075 Inspections A. Inspections shall be governed by Section 109 of the International Building Code adopted in accordance with TMC 16.04.020. B. The Director may require a special inspection as described in Section 1704.7 of the International Building Code adopted in accordance with TMC 16.04.020. 16.54.080 Hazard and Damage A. A person conducting clearing or grading shall protect adjacent property, public resources including surface and groundwaters, set -aside areas, rights -of -way and drainage systems from hazards and damage resulting from activities allowed under this chapter. 16.54.080 085 Financial Guarantees A. The Director may require a bond for erosion preven- tion and sediment control in the amount of 10% of the total project cost on projects which clear more than 6,000 square feet or contain or abut sensitive areas such as, but not limited to, Class 2 or steeper slopes, wetlands, or critical drainage. B. If the Director determines the nature of any work creates a hazard to human life, endangers public or private property or sensitive areas, the Director may require the appli- cant to file a Certificate of Insurance. The Director, based on the nature of the risks involved, shall determine the amount of insurance. (Ord. 2062 §1(part), 2004) 16.54.090 Exceptions The Director may grant a written variance from any re- quirements of TMC Chapter 16.54 if there are exceptional cir- cumstances applicable to the site such that strict adherence to these provisions will not fulfill the intent of TMC Chapter 16.54. (Ord. 2062 §1(part), 2004) 16.54.100 Penalties A. Any violation of any provision, or failure to comply with any of the requirements of TMC Chapter 16.54, shall be subject to the terms and conditions of TMC Chapter 8.45, "Enforcement". B. The City Attorney shall bring injunctive, declaratory, or other actions as necessary to ensure compliance with TMC Chapter 16.54. Any person failing to comply with TMC Chap- ter 16.54 shall be subject to a civil penalty not to exceed $1,000 for each violation. Each violation or each day of non- compliance constitutes a separate violation. C. A notice in writing shall impose the penalty provided for in TMC Chapter 16.54 by certified mail, either with return receipt requested or by personal service, to the person incur- ring the notice. The notice shall describe the violation with reasonable particularity, and order the act or acts constituting the violation or violations to cease and desist or, in appropriate cases, require necessary corrective action within a specific and reasonable time. D. A schedule of penalty fees pursuant to TMC Chapter 16.54 is subject to review by the Tukwila City Council. (Ord. 2062 §1(part), 2009) 16.54.120 Appeals A decision of the Director made in accordance with TMC Chapter 16.54 shall be considered determinative and final. Any appeal must be filed in King County Superior Court within 30 days of the date of issuance of the final determination. (Ord. 2062 §1(part), 2004) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 6 5 FT. OR GREATER 55 1 KEY 10 FT. MINIMUM BENCHING DETAIL I 2 FT. MINIMUM NATURAL SLOPE REMOVE UNSUITABLE MATERIAL Figure 16-5 Benching Details Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 7 PROPERTY LINE H/5 BUT 2 FT MINIMUM AND NEED NOT EXCEED 20 FT MAXIMUM NATURAL OR FINISH GRADE TOE OF SLOPE TOP OF SLOPE H/5 BUT 2 FT MINIMUM AND NEED NOT EXCEED 10 FT MAXIMUM CUT OR FILL SLOPE DRAINAGE DIMENSIONS PROPERTY LINE NATURAL OR FINISH GRADE INTERCEPTOR DRAIN (IF REQUIRED) Figure 16-6 Drainage Dimensions Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 8 � 1 TITLE 17 — SUBDIVISIONS AND PLATS CHAPTER 17.20 DESIGN AND IMPROVEMENT STANDARDS FOR THE SUBDIVISION OF LAND Sections: 17.20.010 Applicability 17.20.020 Improvements, supervision, inspections and permits required 17.20.030 General standards 17.20.010 Applicability The standards contained in this chapter are to be used as the basic standards for addressing the approval criteria for subdivisions, short plats, boundary line adjustments and binding site improvement plans. The decision making entity may require additional standards be met if it is determined necessary to meet the approval criteria for a particular application. (Ord. 1833 §1(part), 1998) 17.20.020 Improvements, supervision, inspections and permits required A. REQUIRED IMPROVEMENTS: Every subdivider may be required to grade and pave streets and alleys, install curbs and gutters, sidewalks, monuments, sanitary and storm sewers, water mains, fire hydrants, street lights and name signs, together with all appurtenances in accordance with specifications and standards of this code, approved by the Public Works Department, and in accordance with other standards of the City. B. SUPERVISION AND INSPECTION: A licensed engineer or engineering firm, acceptable to the Department of Public Works, shall be responsible for the supervision and inspection of all subdivision improvements. All improvements shall be certified in writing as completed in accordance with plans and specifications as approved by the Department of Public Works. C. PERMITS: Prior to proceeding with any subdivision improvements, the subdivider shall obtain those permits from the City as are necessary. The subdivider is also responsible for complying with all applicable permit requirements of other Federal, State and local agencies. (Ord. 1833 §1(part), 1998) 17.20.030 General Standards A. Environmental Considerations: 1. SENSITIVE AREAS - Land which contains a sensitive area or its buffer as defined in Title 18, or is subject to the flood zone control ordinance as defined in TMC Chapter 16.52, shall be platted to reflect the standards and requirements of the sensitive areas overlay zone, TMC Chapter 18.45, the planned residential development overlay if required pursuant to TMC Chapter 18.46, and/or the flood zone control ordinance, TMC Chapter 16.52. No lot shall be created that does not contain an adequate building site, given the environmental considerations of the lot and current development standards. 2. TREES - In addition to meeting the requirements of TMC Chapter 18.54, Tree Regulations, every reasonable effort shall be made to preserve existing trees and native vegetation, and integrate them into the subdivision's design. B. Compatibility with Existing Land Use and Plans: 1. BUFFER BETWEEN USES - Where single-family residential subdivisions are to be adjacent to multiple -family, commercial or industrial land use districts, and where natural separation does not exist, adequate landscape buffer strips and/or solid fences for screening shall be provided. 2. CONFORMITY WITH EXISTING PLANS - The location of all streets shall conform to any adopted plans for streets in the City. If a subdivision is located in the area of an officially designated trail, provisions may be made for reservation of the right-of-way or for easements to the City for trail purposes. The proposed subdivision shall respond to and complement City ordinances, resolutions, and comprehensive plans. 3. OTHER CITY REGULATIONS - All subdivisions shall comply with all adopted City regulations. In the event of a conflict, the more restrictive regulation shall apply. 4. ACCESSORY STRUCTURES - If a subdivision, short plat, or boundary line adjustment in a residential zone would result in an accessory structure remaining alone on a lot, the structure must be demolished before preliminary approval, or the owner must provide a bond or other financial guarantee acceptable to the Director in the amount of 150% of the cost of demolition and assurance that the accessory structure will be demolished if a residence is not built on the lot within 12 months of final approval. C. Streets: 1. EXTENSION: Proposed street systems shall extend existing streets at the same or greater width, unless otherwise approved by the Department of Public Works and authorized by the City Council in approval of the plat. Where appropriate, streets shall be extended to the boundaries of the plat to ensure access to neighboring properties. The City's goal is to have an integrated system of local streets whenever practical. Grading of steep topography may be necessary to achieve this objective. However, in sensitive areas, the layout and construction of streets shall follow the standards and procedures of the sensitive areas overlay zone. Dedication of additional right-of-way may be required for a short plat when it is necessary to meet the minimum street width standards or when lack of such dedication would cause or contribute to an unsafe road or intersection. 2. NAMES: All proposed street names or numbers shall be subject to approval by the Department of Community Development. 3. INTERSECTIONS: Any intersection of public streets, whatever the classification, shall be at right angles as nearly as possible and not be offset insofar as practical. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 9 TITLE 17 — SUBDIVISIONS AND PLATS 4. STREET LAYOUT: Street layout shall provide for the most advantageous development of the subdivision, adjoining areas, and the entire neighborhood. Evaluation of street layout shall take into consideration potential circulation solutions. While it is important to minimize the impact to the topography from creating an integrated road system, improved site development and circulation solutions shall not be sacrificed to minimize the amount of cut and fill requirements of the proposal. Where sensitive areas are impacted, the standards and procedures for rights -of -way in the sensitive areas overlay zone shall be followed. 5. Private access roads may be authorized if: a. Allowing private access roads in the area being subdivided will not adversely affect future circulation in neighboring parcels of property; and b. Adequate and reasonable provisions are made for the future maintenance and repair of the proposed private access roads; and c. The proposed private access roads can accommodate potential full (future) development on the lots created; and d. For residential subdivisions, the proposed private access roads do not serve more than four lots nor are more than 200 feet in length. Those access roads 150 feet or greater in length shall have a turnaround built to Fire Department standards. e. For commercial and industrial subdivisions, when private access roads are authorized, there shall be a minimum easement width of 40 feet. With the exception of minimum easement widths, private access roads shall be designed and constructed in accordance with the Department of Public Works standards, and zoning setbacks shall be required as though the easement were a public right-of-way. 6. PUBLIC ROADS: a. Right-of-way and paving widths for public roads shall be based as shown in the following table. The minimum paving and right-of-way width shall be used unless the City Engineer demonstrates a wider width is needed due to site circumstances, including but not limited to topography, traffic volume, street patterns, on -street parking, lot patterns, land use and bike and transit facilities, that justify an increase in width. Type of Street Right -of -Way Roadway Pavement Principal Arterial 80 -100 feet 48 - 84 feet Minor Arterial 60 - 80 feet 36 - 64 feet Collector Arterial 60 - 80 feet 24 - 48 feet Access Road 50 - 60 feet 28 - 36 feet Cul-De-Sac Roadway 40 feet 26 feet Turnaround 92 feet (dia.) 81 feet (dia.) Alley 20 feet 15 feet Private Access Roads Residential 20 feet 20 feet Commercial 40 feet 28 feet b. Design: The design and alignment of all public streets shall conform to the following standards unless otherwise approved by the Department of Public Works: (1) Cul-de-sacs: Cul-de-sacs are not allowed unless there is no reasonable alternative or the cul-de- sac is shown on an officially adopted street plan. When allowed, they shall not exceed a length of 600 feet unless the City Council determines that adequate alternative emergency access will be provided. (2) Street Grades: Street grades shall not exceed 15%. However, provided there are no vehicular access points, grades may be allowed up to 18%, for not more than 200 feet when: (a) Exceeding the grades would facilitate a through street and connection with the larger neighborhood; (b) The greater grade would minimize disturbance of sensitive slopes; (c) The Fire Marshal grants approval of the grade transition; and (d) Tangents, horizontal curves, vertical curves, and right-of-way improvements conform to Department of Public Works standards. c. Full width improvement: (1) When interior to a subdivision or a short plat of five or more lots, all publicly owned streets shall be designed and installed to full width improvement as provided below: (a) Shall be graded as necessary to conform to Department of Public Works standards. (b) Shall be of asphaltic concrete according to Department of Public Works standards. (c) Shall have permanent concrete curbs and gutters according to Department of Public Works standards. (d) Shall have storm drains consisting of the proper size pipe and catch basins; sizes to be approved by the Department of Public Works prior to the public hearing for the preliminary plat. (e) Shall have sidewalks provided at a minimum width as specified in TMC Chapter 11.12. (2) When interior to a short plat of four or fewer lots, all public streets and all privately owned streets that have the potential to serve five or more lots shall be designed and installed to full width improvement as provided below: (a) Shall be graded as necessary to conform to Department of Public Works standards. (b) Shall be of asphaltic concrete according to Department of Public Works standards. (c) Shall provide storm drainage to be approved by the Department of Public Works. (d) Shall provide sidewalk right-of-way or easements at a minimum width as specified in TMC Chapter 11.12. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 10 7 1 TITLE 17 — SUBDIVISIONS AND PLATS (e) Shall construct or provide L.I.D. no - protest agreements for permanent concrete curbs, gutters, and sidewalks according to Department of Public Works standards. (f) Shall be dedicated to the City or subject to a binding agreement for future dedication. (3) All privately owned roads that will serve four or fewer houses shall be designed and installed to full width improvement as provided below: (a) Shall be graded as necessary to conform to Department of Public Works standards. (b) Shall be of asphaltic concrete according to Department of Public Works standards. (c) Shall provide storm drainage to be approved by the Department of Public Works. d. Half width improvement: (1) Streets abutting the perimeter of a subdivision or short plat of five or more lots shall provide the full improvements on the half of the street adjacent to the site, provided additional paving may be required to ensure safe and efficient roads exist to serve the subdivision; provided further that there are no physical obstructions to completing the other half of the roadway; and that there is a minimum of 20 feet of paving. (2) If the future grade or alignment of the adjacent public street is unknown and it is not feasible to establish the grade in a reasonable period or the immediate improvement of the street would result in a short, isolated segment of improved street and similar street improvements in the vicinity are unlikely to occur within six years, the City may approve a delay of improvements. The owner(s) must agree to enter into a binding L.I.D. no -protest agreement to further improve the street to full public street standards in the future, however adjacent streets must still be improved to the minimum level necessary, in the judgment of the City Engineer, to safely accommodate traffic generated by the proposed subdivision or short plat. (3) Streets abutting the perimeter of a short plat of four or fewer lots shall provide L.I.D. no -protest agreements for construction of frontal improvements on the half of the street adjacent to the site, provided that there is a minimum of 20 feet of paving. D. Utilities: 1. GENERALLY: All utilities designed to serve the subdivision shall be placed underground and, if located within a sensitive area, shall be designed to meet the standards of the sensitive areas overlay zone. Those utilities to be located beneath paved surfaces shall be installed, including all service connections, as approved by the Department of Public Works; such installation shall be completed and approved prior to application of any surface materials. Easements may be required for the maintenance and operation of utilities as specified by the Public Works Department. 2. SANITARY SEWERS: Sanitary sewers shall be provided to each lot at no cost to the City and designed in accordance with City standards. Septic systems may be installed when approved by the Seattle -King County Department of Public Health and when the existing sewer system will not be available to the lot within the life of the preliminary approval. 3. STORM DRAINAGE: The storm drainage collection system shall meet the requirements of the City's stormwater ordinance standards (Ordinance #1755). 4. WATER SYSTEM: Each lot within a proposed subdivision shall be served by a water distribution system designed and installed in accordance with City standards. Locations of fire hydrants and flow rates shall be in accordance with City standards and the Uniform Fire Code. E. Blocks: 1. LENGTH: Residential blocks should not be less than 300 feet nor more than 1,000 feet in length, (600 - 2,000 feet for commercial and industrial areas). Where circumstances warrant for the purpose of implementing the Comprehensive Plan, the Planning Commission may require one or more public pathways of not less than six feet nor more than 15 feet in width, either by dedication or easement, to extend entirely across the width of the block to connect public rights -of -way. 2. WIDTH: Blocks shall be wide enough to allow two tiers of lots, except where abutting a major street or prevented by topographical conditions or size of the property, in which case the City Council may approve a single tier. 3. PEDESTRIAN CONSIDERATIONS: Blocks, roads and pedestrian improvements shall be designed to provide a safe and convenient pedestrian network. F. Lots: 1. ARRANGEMENT: Insofar as practical, side lot lines shall be at right angles to street lines or radial to curved street lines. Each lot must have access to a public street that is approved at the time of plat review; however, rather than designing flag lots, access shall be accomplished with common drive easements. 2. LOT DESIGN: The lot area, width, shape, and orientation shall be appropriate for the location of the subdivision, for the type of development and land use contemplated, and shall conform with the requirements of the zoning ordinance. 3. CORNER LOTS: Corner lots may be required to be platted with additional width to allow for the additional side yard requirements. G. Landscaping: 1. Each lot within a '.new subdivision or short plat of five lots or greater shall be landscaped with at least one tree in the front yard to create a uniform streetscape. 2. Landscaping shall conform with Public Work standards. H. Street Signs: The subdivider shall be responsible for the initial cost of any street name or number signs, or street markings, including installation thereof, that Public Works finds necessary for the subdivision, Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 11 TITLE 17 — SUBDIVISIONS AND PLATS I. Lighting: Street lighting shall conform to the De- partment of Public Works standards unless the City Council requires alternative fixtures, poles, and/or spacing to contribute to an overall design concept of the subdivision. J. Monumentation: 1. IMPRINTED MONUMENT: All monuments set in subdivisions shall be at least 1/2 inch x 24-inch steel bar or rod, or equivalent, with durable cap imprinted with the license number of the land surveyor setting the monument. 2. CENTERLINE MONUMENT: After paving, except as provided in TMC 17.20.030J.5, monuments shall be driven flush with the finished road surface at the following intersections: a. Centerline intersections. b. Points of intersection of curves if placement falls within the paved area: otherwise, at the beginnings and endings of curves. c. Intersections of the plat boundaries and street center lines. 3. PROPERTY LINE MONUMENTATION: All front corners, rear corners, and beginnings and endings of curbs shall be set with monuments, except as provided in TMC 17.20,030J.5. In cases where street curbs are concentric and/or parallel with front right-of-way lines, front property line monumentation may be provided by brass screws or concrete nails at the intersections of curb lines and the projections of side property lines. If curb monumentation is used, it shall be noted on the plat, and also that such monumentation is good for projection of line only and not for distance. 4. POST-MONUMENTATION: All monuments for exterior boundaries of the subdivision shall be set and referenced on the plat prior to plat recording. Interior monuments need not be set prior to recording if the developer certifies that the interior monuments shall be set within 90 days of final subdivision construction inspection by the Department of Public Works, and if the developer guarantees such interior monumentation. 5. POST-MONUMENTATION BONDS: In lieu of setting interior monuments prior to final plat recording as provided in TMC 17.20.030J.3, the Public Works Director may accept a bond in an amount and with surety and conditions satisfactory to the Director, or other secure method as the Public Works Director may require, providing for and securing the actual setting of the interior monuments. (Ord. 1971 §21, 2001; Ord. 1833 §1(part), 1998) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 12 TITLE 18 - ZONING CHAPTER 18.06 DEFINITIONS 18.06.586 Native Vegetation "Native vegetation" means plant species, other than noxious weeds, that are indigenous to the coastal reqion of the Pacific Northwest and that reasonably could be expected to have occurred naturally on the site. uq as Ir, erne oc , western red cedar; alder, lig-leaf-n apte, Vint a 16 willaw elderberry;-`salmonbeny, salal,_swerd-fem,-foam-flower, and fireweed.vegetatier wit -a (Ord. 2347 §21, 2011) CHAPTER 18.20 RESIDENTIAL COMMERCIAL CENTER (RCC) DISTRICT i n c I vac_ Non &Ave ,• 18.20.080 Basic Development Standards Development within the Residential Commercial Center District shall conform to the following listed and referenced standards: RCC BASIC DEVELOPMENT STANDARDS Lot area, minimum 5,000 sq. ft. Lot area per unit (multi -family), minimum 3,000 sq. ft. Setbacks to yards (min.): • Front 20 feet • Second front 10 feet • Sides 5 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear 10 feet Height, maximum 3 stories or 35 feet Landscape requirements (minimum): All setback areas shall be landscaped. Required landscaping may include a mix of plant materials, bioretention facilities, pedestrian amenities and features, outdoor cafe -type seating and similar features, subject to approval. See Landscape, Recreation, Recycling/Solid Waste Space chapter for further requirements • Front 20 feet • Second front 10 feet • Sides, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet • Rear, if any portion of the yard is within 50 feet of LDR, MDR, HDR 10 feet Recreation space 200 sq. ft. per dwelling unit (1,000 sq. ft. min.) Off-street parking: • Residential See TMC Chapter 18.56, Off-street Parking & Loading Regulations • Accessory dwelling unit See Accessory Use section of this chapter • Office, minimum 3 per 1,000 sq. ft. usable floor area • Retail, minimum 2.5 per 1,000 sq. ft. usable floor area • Other uses See TMC Chapter 18.56, Off-street Parking & Loading Regulations Performance Standards: Use, activity and operations within a structure or a site shall comply with (1) standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, (2) TMC Chapter 8.22, "Noise", and, (3) adopted State and Federal standards for water quality and hazardous materials. In addition, all development subject to the requirements of the State Environmental Policy Act, RCW 43.21 C, shall be evaluated to determine whether adverse environmental impacts have been adequately mitigated. (Ord. 1976 §39, 2001; Ord. 1872 §3, 1999; Ord. 1758 §1 (part), 1995) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 13 CHAPTER 18.28 TUKWILA URBAN CENTER (TUC) DISTRICT 18.28.070 Structure Height A. The minimum and maximum height of a structure shall be as specified by District or modified by a special height overlay. See Table 3, "District Standards." 1. Structures oriented to Baker Boulevard shall have an average height at least as high as the minimum listed in Table 18-3, "District Standards." B. Pond Edge Height Limit. 1. Development located within 150 feet of the edge of Tukwila Pond is not eligible for incentive height increases. 2. The maximum height in this location shall be as specified by District. C. Public Frontage Improvement Height Incentive. 1. As an incentive to provide public frontage improvements and/or new streets that are not otherwise required under this code, allowable structure heights may be increased to the limits as specified for each District as shown in Table 18-3, "District Standards,' when: a. Developers construct public frontage improvements along their parcel frontages on existing streets, constructed to the standards of this code; or b. Developers construct new 20 foot wide half streets with one side of public frontage improvements, constructed to the standards of this code; or c. The existing sidewalk width and configuration along a parcel's frontage meets or exceeds the public frontage standard and, when averaged, the landscape width and street tree spacing meet the required public frontage standard. Additional sidewalk width may substitute for an equal area of landscaping. d. In order to take advantage of this incentive, the public frontage improvements must start and stop at property boundaries, intersections or traffic signals and transition safely to neighboring conditions. 2. The public frontage height incentive will be applied proportionally to parcels with more than one frontage based on the following: a. Each frontage will be evaluated separately based on its Corridor Type's public frontage standards. b. The height bonus will be applied to a percentage of the total building footprint(s) on site based on the percentage of the parcel's total public frontage that, when averaged, meets the public frontage standard. For example, when averaged, if one of a parcel's two similar length frontages meets the corridor's public frontage standard, then 50% of the total building footprint on site is eligible for the height incentive. D. Multi -Family Height Incentive. 1. As an incentive to construct residential dwelling units, allowable structure heights may be increased to the limits specified in Table 18-3, "District Standards." *' \ TITLE 18 — ZONING 2. Structures may be completely residential or mixed use, with residential uses comprising at least half of the occupied floor area of the building. E. Structured Parking Height Incentive 1. As an incentive to reduce impervious cover associated with parking lots and increase areas of native vegetation, allowable structure heights may be increased to the limits specified in Table 18-3, "District Standards," when: a. Developers place a minimum of 80 percent of the minimum required parking stalls within structured parking (transferred parking); and b. Developers restore as a native growth retention area an area equal to 40 percent of the area that otherwise would have been needed to construct the transferred parking as a surface lot. 2. In order to take advantage of this incentive, the native growth retention area must meet specifications of the native vegetated landscape of the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30 and must be set aside by a covenant, easement, or tract and preserved and maintained for the life of the project. EF. Structures qualify for increased height as set forth in Table 18-3, "District Standards," when integrating any of the following combination of height incentives: 1. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that meet the requirements of two of the three available height incentives: bet# -the frontal improvement, and -multi -family , or structured parking height incentive requirements. 2. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that achieve a LEED certification of silver or higher and meet eithef the requirements of one of the three available height incentives: the frontal improvement,,-f—multi-family structured parking height incentive requirement. 3. In the TUC-TOD District, allowable structure heights may be increased to 115 feet for developments that meet the multi -family height incentive requirements and make at least 20% of the residential units affordable per the standards in WAC 365-196-870. For rental units, affordability is set at 50% of the county median family income, adjusted for family size. For owner -occupied units, affordability is set at 80% of the county median family income, adjusted for family size. (Ord. 2443 §8, 2014) 18.28.240 General Landscaping A. The provisions herein are applicable to setbacks, public frontage areas, open space, and other areas on - premises. These regulations address plant materials and design, visibility, irrigation, landscape plans, utility and service areas. B. General Landscaping Requirements. 1. Plant Materials. a. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 14 TITLE 18 — ZONING b. All plant material shall meet the most recent American Standards for Nursery Plant Stock (ANSI Z60.1). c. Evergreen trees shall be a minimum of 6 feet in height at time of planting. d. Deciduous trees shall be a minimum 2.5 inch caliper six inches off the ground when installed. e. Shrubs shall be at least 18 inches in height at time of planting. f. Existing vegetation may be used to meet the perimeter landscaping requirements. All significant trees located within any required perimeter landscape area that are not dead, dying, or diseased and that do not pose a safety hazard as determined by the City or a qualified arborist shall be retained and protected during construction with temporary fencing or other enclosure, as appropriate to the site. The area designated for protection will vary based on the tree's diameter, species, age, and the characteristics of the planted area. Property owners may be required to furnish a report by an International Society of Arborist (ISA) certified arborist to document a tree's condition. The Director may require that an ISA certified arborist be retained to supervise tree protection during construction. Grade changes around existing trees are to be avoided whenever possible. g. New plant materials shall include native species or non-native species that are drought tolerant and have adapted to the climatic conditions of the Puget Sound Region. There must be a diversity of tree and shrub genus and species in the site landscaping, taking into account species in existing development around the site. h. No species that are listed on the State or King County noxious weed lists may be planted. i. Plant materials shall be selected that reinforce the landscape design concept, and are appropriate to their location in terms of hardiness, tolerance to urban conditions, maintenance needs and growth characteristics. Large and medium canopy tree species are required, except where there is insufficient planting area (due to proximity to a building, street light, above ground or underground utility line, etc.). 2. Visibility. a. Design of new landscaping and maintenance of existing landscaping shall consider Crime Prevention Through Environmental Design (CPTED) principals and visibility for safety and views. Appropriate plant species shall be specified to avoid the need for excessive maintenance pruning. Trees along the street frontages, as they mature, shall be limbed up to a minimum height of 6 feet (8 feet where they extend over sidewalks) to allow adequate visibility and clearance for vehicles. Trees may be pruned to improve views of signage and entryways by using such techniques as windowing, thinning, and limbing-up. However, no more than 1/4 of the canopy may be removed within any 2-year period, and the crown should be maintained to at least 2/3 the height of the tree. All pruning shall be done in accordance with ANSI Standard A-300 specifications. Trees may not be topped for any reason. Trees may only be pruned to lower their height to prevent interference with an overhead utility or electrical line, with prior approval by the Director. b. Landscaping shall not obstruct views from or into the driveway, sidewalk or street. Landscape design shall allow for surveillance from streets and buildings and avoid creating areas that might harbor criminal activity. c. Landscaping at crosswalks and other locations where vehicles and pedestrians intersect must not block pedestrians' and drivers' views. d. Evergreen shrubs and trees shall be used for screening along rear property lines, around solid waste/recycling areas and mechanical equipment, and to obscure grillwork and fencing associated with subsurface parking garages. 3. Soil Preparation and Planting. a. For trees planted in sidewalks and parking lots, Cornell University CU-Structural Soils must be used to a preferred depth of 36 inches, to promote tree root growth and provide structural support to the paved area. Minimum soil volumes for tree roots shall be 750 square feet per tree (see specifications and sample plans for CU-Structural Soils). Trees and other landscape materials shall be directly planted into a planting mix, approved by the Director, that is installed on top of the structural soils. b. For soil preparation in bioretention areas, existing soils must be protected from compaction, and bioretention soil media must be prepared in accordance with Bioretention Soil Media Standard Specifications from the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30 to promote a proper functioning bioretention system. These specfications shall be adhered to regardless of whether a stormwater permit is required from the City. lac. For all other plantings, soils must be prepared for planting in accordance with specifications to restore soil moisture holding capacity in accordance with TMC Chapter 16.54, GradinqBMP T5.13, "Post Construction Soil Quality and Depth," from the Washington Department of Ecology Stormwater Management Manual for Western Washi tea--was—amendod), regardless of whether a stormwater permit is required by the City. sd. The applicant will be required to schedule an inspection by the City of the planting areas prior to planting to ensure soils are properly prepared. de. Installation of landscape plants must comply with best management practices including: (1) Planting holes that are the same depth as the size of the root ball and 2 times wider than the size of the root ball. (2) Root balls of potted and balled and burlapped (B&B) plants must be loosened and pruned as necessary to ensure there are no encircling roots prior to planting. At least the top 2/3 of burlap and all straps or wire baskets are to be removed from B&B plants prior to planting. (3) The top of the root flare, where the roots and the trunk begin, should be about one inch from the Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 15 TITLE 18 — ZONING surrounding soil. The root ball shall not extend above the soil surface. (4) If using mulch around trees and shrubs, maintain at least a 3-inch mulch -free ring around the base of the plant trunks and woody stems of shrubs. If using mulch around groundcovers until they become established, mulch shall not be placed over the crowns of perennial plants. 4. Irrigation. a. The intent of this standard is to ensure that plants will survive the critical establishment period when they are most vulnerable due to lack of watering. b. All required plantings must be served by a permanent automatic irrigation system. (1) Irrigation shall be designed to conserve water by using the best practical management techniques available. These techniques may include, but not be limited to: drip irrigation to minimize evaporation loss, moisture sensors to prevent irrigation during rainy periods, automatic controllers to insure proper duration of watering, sprinkler head selection and spacing designed to minimize overspray, and separate zones for turf and shrubs and for full sun exposure and shady areas to meet watering needs of different sections of the landscape. (2) Exceptions to the irrigation requirement may be approved by the Director, such as xeriscaping (i.e., low water usage plantings), plantings approved for low impact development techniques, established indigenous plant material, or landscapes where natural appearance is acceptable or desirable to the City. However, those exceptions will require temporary irrigation until established. 5. Landscape Plan Requirements. a. A Washington State licensed landscape architect shall prepare and stamp the landscape plans in accordance with the standards herein. Detailed plans for landscaping and screening shall be submitted with plans for building and site improvements. Included in the plans shall be type, quantity, spacing and location of plants and materials; typical planting details; and the location of irrigation systems. Underground and at -ground utilities shall be shown on the plans so that planting conflicts are avoided. b. Installation of the landscaping and screening shall be completed and a Landscaping Declaration submitted by the owner or owner's agent prior to issuance of the Certificate of Occupancy. If necessary due to weather conditions or construction scheduling, the installation may be postponed to the next planting season if approved by the Director and stated on the building permit. A performance assurance device equal to 150% of the cost of the labor and materials must be provided to the City before the deferral is approved. 6. Parking Lots. a. Setback and Perimeter Landscaping: (1) Surface parking lots shall set back a minimum of five feet from any open space, building facade, or Corridor back of sidewalk. The setback shall be designed and planted with: (a) 1 evergreen shrub per 4 linear feet of property line, excluding curb cuts. (b) Sufficient live groundcovers of varying heights, colors and textures to cover, within 3 years, 100% of the yard area not needed for trees and shrubs. Groundcover must be planted with a minimum spacing of 12 inches on center for 4-inch pots and 18 inches on center for 1- gallon pots. If turf grass is being used as the groundcover, a 3-foot diameter ring of bark mulch is required around any tree. (2) Surface parking lots shall be buffered from adjacent residential development with heavy screening in the side and rear setback areas. b. Interior Parking Lot Landscaping: (1) For surface parking lots adjacent to public or private streets, a minimum of 20 square feet of interior parking lot landscaping is required for each parking stall. In the Workplace District, a minimum of 15 square feet per stall is required for warehouse and light industrial uses. (2) For surface parking lots located behind buildings or otherwise screened from public or private streets or public spaces, a minimum of 10 square feet of interior parking lot landscaping is required for each parking stall. (3) Flexibility is allowed for the layout of parking lots and landscaped areas, but the goal is to provide shade from trees that are evenly distributed throughout the parking lot. Planting trees in continuous, landscaped planting strips between rows of parking is encouraged. This approach may also be combined with surface water management design. For parking lots adjacent to public or private streets, if landscape islands are designed into the parking lot layout to divide continuous rows of parking stalls, they must be placed at minimum spacing of every 10 parking spaces. For parking areas located behind buildings or otherwise screened from public or private streets or public spaces, if landscape islands are used, they shall be placed at a minimum of one island every 15 parking stalls. (4) Landscape islands must be a minimum of 6 feet wide and a minimum of 100 square feet in area. All landscaped areas must be protected from damage by vehicles (curbs, tire stops, other techniques). (5) Landscape islands shall be placed at the ends of each row of parking to protect parked vehicles from turning movements of other vehicles. (6) A minimum of one large -canopy evergreen or deciduous tree or two medium -canopy trees are required for every 100 square feet of landscaped island, with the remaining area to contain a combination of shrubs, living groundcover, and mulch (see Figure 18-47). Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 16 TITLE 18 — ZONING Figure 18-47: A single tree planted with no other materials and little room for viability is not acceptable. 7. Utility and Service Areas. Utility easements and other similar areas between property lines and curbing shall be landscaped and/or treated with dust and erosion control planting or surfacing. Trees proposed under overhead transmission lines shall be approved by the City on a case -by - case basis. 8. Street Trees in the Publiic Frontage. a. Street tree spacing in the public frontage shall be as specified in the applicable Corridor Standards. For smaller stature trees (those with canopies at maturity of less than 20 feet), spacing should be every 20 feet. For larger canopy trees, spacing should be wider as appropriate to the mature spread of the tree. Spacing will also need to consider sight vision distance at intersections, driveway locations, and utility conflicts. b. Street trees in the public frontage shall be planted to at least the following spacing standards: (1) At least 3.5 feet back from the face of the curb and with an approved root barrier installed on the curb side. (2) At least 5 feet from underground utility lines. (3) At least 10 feet from power poles. (4) At least 7.5 feel from driveways. (5) At least 3 feet from pad -mounted transformers (except 10 feet in front for access). (6) At least 4 feet from fire hydrants and connections. c. When used, tree grates and landscaped tree wells shall be a minimum 36 square feet in size (6' x 6'). Tree grates are not encouraged, but when used grates must have easily removable rings so that sections of grate can be removed incrementally as the tree matures. Tree well size may be adjusted to comply with ADA standards on narrower sidewalks. Root barriers must be installed at curb face. See TMC Section 18.28.240.B.3, "Soil Preparation and Planting," for structural soil requirements. d. Planting and lighting plans shall be coordinated so that trees are not planted in locations where they would obstruct existing or planned street or site lighting, while maintaining appropriate spacing and allowing for their size and spread at maturity. 9. Maintenance and Pruning. a. Any landscaping required by this chapter shall be retained and maintained by the property owner for the life of the project in conformance with the intent of the approved landscape plan and this chapter. Maintenance shall include keeping all planting areas free of weeds and trash and replacing any unhealthy or dead plant materials. b. Pruning of trees is only allowed for the health of the tree, to maintain sight distances or sight lines into commercial areas, or if interfering with overhead utilities. All pruning must be done in accordance with American National Standards Institute (ANSI) A-300 specifications. No tree planted by a property owner or the City to fulfill landscape requirements, or any existing tree, may be topped or removed without prior approval from the City. If a tree is topped or removed without approval, it shall be replaced with a new tree that meets the intent of this chapter within 120 days or the property owner will be subject to code enforcement action per TMC Chapter 8.45. Options at the Director's discretion are to require replacement of the tree with a new tree of similar species that will achieve a similar canopy size at maturity, replace the tree with multiple smaller diameter trees of an appropriate species (only if there are limitations on space or conflicts with utility infrastructure), and/or require an in -lieu fee for off -site tree replacement. C. General Landscaping Considerations. 1. Plant Materials. a. Drought resistant species are encouraged in order to minimize irrigation requirements, except where site conditions within the required landscape areas ensure adequate moisture for growth. b. The mature size of selected tree species should be suitable to lot size, the scale of adjacent structures, and the proximity to utility lines. c. In general, deciduous trees with open branching structures are recommended to ensure visibility to retail establishments. More substantial shade trees are recommended in front of private residences. d. All trees should be selected and located so they will not obstruct views to showroom windows and building signage as they mature. e. Evergreen landscaping (Figure 18-48) is appropriate for screening utility vaults, loading docks and some storage areas. (Also see TMC Section 18.52.040 for screening outdoor storage areas.) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 17 TITLE 18 — ZONING Figure 18-48: Using evergreen landscaping to screen utilities f. Species selection is very important in grouped plantings (Figure 18-499. Drought tolerant species are strongly recommended and monoculture plantings are discouraged. Low maintenance cost and low replacement costs are two advantages of planting drought tolerant species in grouped configurations. Low (24-30 inches) shrubs, perennial or groundcover plantings that provide a superior degree of separation between the sidewalk and street at reduced maintenance costs may be used. Figure 18-49: Examples of landscaped tree wells 2. Design. a. Shade trees should be planted to shade buildings' east and west -facing windows to provide a balance between summer cooling and winter heating through solar gain. b. All landscaped areas should be designed to allow aquifer filtration and minimize stormwater run-off utilizing bio-swales, filtration strips, and bio-retention ponds where appropriate. (Ord. 2443 §25, 2014) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 18 TITLE 18 — ZONING CHAPTER 18.52 LANDSCAPE, RECREATION, RECYCLING/SOLID WASTE SPACE REQUIREMENTS 18.52.020 Perimeter Landscaping Requirements by Zone District A. In the various zone districts of the City, landscaping in the front, rear and side yards shall be provided as established by the various zone district chapters of this title. These requirements are summarized in the following table, except for Tukwila Urban Center (TUC) requirements, which are listed in TMC Chapter 18.28. ZONING DISTRICTS FRONT YARD (SECOND FRONT) LANDSCAPE TYPE FOR FRONTS SIDE YARD REAR YARD LANDSCAPE TYPE FOR SIDE/REAR LDR (for uses other than dwelling units 152 Type I 10 10 Type I MDR 151'2 Type I 10 10 Type I HDR 151'2 Type I 10 10 Type I MUO 15 (12.5)2 Type 17 54 54 Type 17 O 15 (12.5)2 Type 17 54 54 Type 17 RCC 20 (10)2'3 Type 17 54 10 Type II NCC 54 Type 17 04 04 Type 11 RC 10 Type I 54 0 Type 118 RCM 10 Type I 54 0 Type 118 TUC — See TMC Chapter 18.28 C/LI 12.55 Type 16 5 05 Type 18 LI 12.52 Type II 04 04 Type III HI 12 52 Type II 04 0 Type III MIC/L 55 Type II 05 05 Type III MIC/H 55 Type II 05 05 Type III TVS 152'3 Type II 04 04 Type III TSO 159'2 Type I 010 010 Type III Notes: 1. Minimum required front yard landscaped areas in the MDR and HDR zones may have up to 20% of their required landscape area developed for pedestrian and transit facilities upon approval as a Type 2 special permission decision. Bioretention may also serve as 20% of the required front yard landscaping for MDR and HDR zones. 2. In order to provide flexibility of the site design while still providing the full amount of landscaping required by code, the front yard landscape width may be divided into a perimeter strip and one or more other landscape areas between the building and the front property line, if the perimeter strip is a minimum of 10 feet and the landscape materials are sufficient to provide landscaping along the perirneter and screening of the building mass. 3. Required landscaping may include a mix of plant materials, pedestrian amenities and features, outdoor cafe - type seating and similar features, subject to approval as a Type 2 special permission decision. Bioretention may also be used as required landscaping for RCC, TVS, and TS0 districts. Required plant materials will be reduced in proportion to the amount of perimeter area devoted to pedestrian oriented space. 4. Increased to 10 feet if any portion of the yard is within 50 feet of LDR, MDR or HDR. 5. Increased to 15 feet if any portion of the yard is within 50 feet of LDR, MDR or HDR. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 19 TITLE 18 — ZONING 6. Increased to Type II if the front yard contains truck loading bays, service areas or outdoor storage. 7. Increased to Type II if any portion of the yard is within 50 feet of LDR, MDR or HDR. 8. Increased to Type III if any portion of the yard is within 50 feet of LDR, MDR or HDR. 9. Only required along public streets. 10. Increased to 10 feet if adjacent to residential uses or non-TSO zoning. B. The landscape perimeter may be averaged if the total required square footage is achieved, unless the landscaping requirement has been increased due to proximity to LDR, MDR or HDR. Landscape perimeter averaging may be allowed as a Type 2 special permission decision if all of the following criteria are met: 1. Plant material can be clustered to more effectively screen parking areas and blank building walls. 2. Perimeter averaging enables significant trees or existing built features to be retained. 3. Perimeter averaging is used to reduce the number of driveways and curb cuts and allow joint use of parking facilities between neighboring businesses. 4. Width of the perimeter landscaping is not reduced to the point that activities on the site become a nuisance to neighbors. 5. Averaging does not diminish the quality of the site landscape as a whole. (Ord. 2442 §1, 2014; Ord. 2251 §61, 2009; Ord. 2235 §13, 2009; Ord. 1872 § 14 (part), 1999) 18.52.030 Perimeter Landscape Types A. Type 1 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a light visual separation between uses and zoning districts, screen parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 30 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 7 lineal feet of required perimeter excluding curb cuts or a planted berm at least 24 inches high; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type I landscape perimeter, provided that the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided that public safety is not compromised. B. Type 11 landscape perimeter. 1. Purpose is to enhance Tukwila's streetscapes, provide a moderate visual separation between uses and zoning districts, screen blank building walls and parking areas, and allow views to building entryways and signage. 2. Plant materials shall consist of the following: a. One tree for each 20 lineal feet of required perimeter excluding curb cuts; and b. One shrub for each 5 lineal feet of required perimeter excluding curb cuts; and c. Living groundcover to cover 90% of the landscape area within three years. 3. Bioretention may be used as a Type II landscape perimeter, provided that the intent of the screen is achieved. To support bioretention facility function and plant survival, flexibility in plant materials and placement shall be allowed, provided that public safety is not compromised. C. Type 111 landscape perimeter. 1. Purpose is to provide extensive visual separation between industrial areas and nearby residential areas. 2. Plant materials shall consist of the following: a. One tree per 20 lineal feet of required perimeter excluding curb cuts; and b. Shrubs to provide a solid planting screen with a height of five to eight feet or a solid wooden fence or masonry wall to be approved by the Community Development Director; and c. Living groundcover to cover 90% of the landscape area within three years. D. Plant material requirements. 1. Plants shall meet the current American Standard for Nursery Stock (American Nursery and Landscape Association — ANLA), and shall be healthy, vigorous and well - formed, with well -developed, fibrous root systems, free from dead branches or roots. Plants shall be free from damage caused by temperature extremes, lack of or excess moisture, insects, disease, and mechanical injury. Plants in leaf shall be well foliated and of good color. Plants shall be habituated to outdoor environmental conditions (hardened -off). 2. A mix of evergreen trees and evergreen shrubs shall be used to screen blank walls. 3. Deciduous trees shall be used to allow visual access to entryways, signage and pedestrian use areas. 4. Evergreen shrubs shall be used to screen parking lots along street frontages. 5. In perimeters located adjacent to residential zones 75% of trees and shrubs shall be evergreen. 6. Evergreen trees shall be a minimum of 6 feet in height at time of planting. 7. Deciduous trees shall have at least a 2 inch caliper at time of planting, determined according to the American Standard for Nursery Stock. 8. Shrubs shall be at least 18 inches in height at time of planting. 9. No plants listed on the current King County Noxious Weed list may be used. 10. Existing vegetation may be used to meet the requirements of this chapter. All significant trees located within any required perimeter landscaping area which are not dead, dying, or diseased and which do not pose a safety hazard as determined by the Community Development Director shall be retained. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 20 TITLE 18 — ZONING 11. The classification of plant material as trees, shrubs and evergreens shall be as listed in the Hortus Third, A Concise Dictionary of Plants Cultivated in the U.S. and Canada. 12. Plant material requirements for bioretention facilities shall be in accordance with the City's bioretention plant list. (Ord. 2251 §62, 2009; Ord. 1872 §14 (part), 1999) 18.52.035 Interior Parking Lot Landscaping Requirements Landscaping within parking areas shall be provided as shown below. 1. Requirements for each distinctly separate parking area within the LDR zone for uses other than dwelling units, and in the MDR and HDR zones: a. For areas with up to 20 parking stalls per parking area, no interior landscaping is required. b. For areas with 21 - 40 parking stalls per parking area, 7 square feet of interior landscape area is required for each parking stall. c. For areas with more than 40 parking stalls per parking area, 12 square feet of interior landscape area is required for each parking stall (see Multi -Family Design Guidelines, Site Planning Section, No. 31, for the normal 15 square feet to be provided). d. All parking areas shall have a perimeter landscape strip a minimum of 2 feet wide with an average width of 5 feet. 2. Requirements for parking lots within the 0, MUO, RCC, and NCC zones: a. For lots with up to 20 parking stalls, no interior landscaping is required. b. For lots with 21 - 40 parking stalls, a minimum of 10 square feet of interior landscape area is required for each parking stall over 20. c. For lots with more than 40 parking stalls, a minimum of 200 square feet of interior landscape area plus 15 square feet for each parking stall over 40 is required. For areas placed behind buildings or otherwise screened from streets, parks and City trails the interior landscape requirement is reduced to a minimum of 200 square feet plus 10 square feet for each parking stall over 40. 3. Requirements for parking lots within the RC, RCM, C/LI, TSO and TVS zones: a. For areas adjacent to public or private streets, a minimum of 15 square feet of landscaping is required for each parking stall. b. For areas placed behind buildings or otherwise screened from streets, parks and City trails a minimum of 10 square feet of interior landscape area is required for each parking stall. 4. Planting Standards: a. Interior landscape islands shall be distributed to break up expanses of paving. Landscaped areas shall be placed at the ends of each interior row in the parking area, with no stall more than 10 stalls or 100 feet from a landscape area. Landscaped areas and planting islands may contain bioretention, b. The minimum size for interior parking lot planting islands is 100 square feet. c. Planting islands shall be a minimum of 6 feet in any direction and generally the length of the adjacent parking space. d. Raised curbs or curb stops shall be used around the landscape islands to prevent plant material from being struck by automobiles. Where bioretention is used, curb cuts shall be placed to allow stormwater runoff from adjacent pavements to enter the bioretention system. e. A minimum of 1 evergreen or deciduous tree is required per landscape island, with the remaining area to contain a combination of shrubs, living groundcover and mulch. (Ord. 2442 §2, 2014; Ord. 2251 §63, 2009; Ord. 2235 § 14, 2009; Ord. 1872 §14 (part), 1999) 18.52.050 Landscape Plan Requirements A. A Washington State licensed landscape architect shall prepare and stamp the landscape plans in accordance with the standards herein. Detailed plans for landscaping and screening shall be submitted with plans for building and site improvements. Included in the plans shall be type, quantity, spacing and location of plants and materials, site preparation and specifications for soils and mulches, location of all overhead and underground utilities (so as to avoid conflicts with proposed planting locations), typical planting details and the location of irrigation systems. B. Installation of the landscaping and screening shall be completed and a Landscaping Declaration submitted by the owner or owner's agent prior to issuance of the certificate of occupancy. If necessary, due to weather conditions or construction scheduling, the installation may be postponed to the next planting season if approved by the Community Development Director and stated on the building permit. A performance assurance device equal to 150% of the cost of the labor and materials must be provided to the City before the deferral is approved. The property owner shall keep all planting areas free of weeds and trash and replace any unhealthy or dead plant materials for the life of the project in conformance with the intent of the approved landscape plan and TMC Section 8.28.180. Any landscaping required by this chapter shall be retained and maintained for the life of the project. Additionally, topping or removal of required trees is prohibited. Only trees that pose a danger or are diseased, as determined by an ISA certified arborist, shall be allowed to be removed. Any illegal removal of required trees shall be subject to obtaining a tree permit and replacement with trees that meet or exceed the functional value of the removed trees. C. Landscape Plans that include a bioretention facility shall be submitted to the Public Works Director in addition to the Community Development Director. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 21 TITLE 18 — ZONING (Ord. 2368§53, 2012; Ord. 2251 §65, 2009; CHAPTER 18.56 Ord. 1971 §19, 2001; Ord. 1872 §14 (part), 1999) OFF-STREET PARKING AND LOADING REGULATIONS 18.56.040 General Requirements Any required off-street parking and loading facilities shall be developed in accordance with the following standards: 1. Location. Any on -premises parking area which contains parking stalls located more than 1,000 feet from the principal use shall require Board of Architectural Review approval for the entire parking lot. 2. MINIMUM PARKING. Minimum parking area dimensions for surface and structured parking facilities shall be as provided in Figure 18-6. Standard and compact parking stalls shall be allowed a two -foot landscaping overhang to count towards the stall length. 3. TANDEM PARKING SPACES. In the MDR and HDR zones, tandem spaces (where one car is parked directly behind another) will be allowed for each three bedroom and 1/3 of all two bedroom units. No more than 1/3 of all project parking spaces may be tandem and all tandem parking spaces will be designed for full size rather than compact size vehicles based on the dimensions in Figure 18-6. 4. PARKING AREA AND PARKING AREA ENTRANCE AND EXIT SLOPES. The slope of off-street parking spaces shall not exceed 5%. The slope of entrance and exit driveways providing access for off-street parking areas and internal driveway aisles without parking stalls shall not exceed 15%. 5. DRIVEWAYS AND MANEUVERABILITY. a. Adequate ingress to and egress from each parking space shall be provided without moving another vehicle and without backing more than 50 feet. b. Turning and maneuvering space shall be located entirely on private property unless specifically approved by the Public Works Director and the Board of Architectural Review. c. All parking spaces shall be internally accessible to one another without reentering adjoining public streets. d. When off-street parking is provided in the rear of a building and a driveway or lane alongside the building provides access to rear parking area, such driveway shall require a minimum width of twelve feet and a sidewalk of at least a three-foot section, adjoining the building, curbed or raised six inches above the driveway surface. e. Ingress and egress to any off-street parking lot shall not be located closer than 20 feet from point of tangent to an intersection. f. The Public Works Director or the Community Development Director may require ingress separate from an egress for smoother and safer flow of traffic. 6. The Director may require areas not designed or approved for parking to be appropriately marked and/or signed to prevent parking. 7. SURFACE. Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 22 TITLE 18 — ZONING a. The surface of any required off-street parking or loading facility shall be paved with asphalt, concrete or other similar approved material (s) and shall be graded and drained as to dispose of all surface water, but not across sidewalks. b. All traffic -control devices, such as parking stripes designating car stalls, directional arrows or signs, bull rails, curbs and other developments shall be installed and completed as shown on the approved plans. c. Paved parking areas shall use paint or similar devices to delineate car stalls and direction of traffic. d. Where pedestrian walks are used in parking lots for the use of foot traffic only, they shall be curbed or raised six inches above the lot surface. e. Wheel stops shall be required on the periphery of parking lots so cars will not protrude into the public right-of-way, walkways, off the parking lot or strike buildings. Wheel stops shall be two feet from the end of the stall of head -in parking. f. The use of permeable pavement is the preferred material for parking surfaces, and any parking stalls provided in excess of the required minimum required off-street parking spaces shall use permeable pavement where technically feasible in accordance with the Surface Water Design Manual, adopted in accordance with TMC Chapter 14.30. 8. PARALLEL PARKING STALLS. Parallel parking stalls shall be designed so that doors of vehicles do not open onto the public right-of-way. 9. OBSTRUCTIONS. No obstruction which would restrict car door opening shall be permitted within five feet of the centerline of a parking space. 10. LIGHTING. Any lighting on a parking lot shall illuminate only the parking lot, designed to avoid undue glare or reflection on adjoining premises. 11. CURB -CUTS. All parking areas shall have specific entrance and/or exit areas to the street. The width of access roads and curb -cuts shall be determined by the Public Works Director. The edge of the curb -cut or access road shall be as required by the Public Works Director for safe movement of vehicles or pedestrians. Curb -cuts in single- family districts shall be limited to a maximum of 20 feet in width and the location shall be approved by the Public Works Director. 12. PARKING STALL. Parking stalls shall not be used for permanent or semi -permanent parking or storage of trucks or materials. (Ord. 2368 §54, 2012; Ord. 2251 §66, 2009; Ord. 1795 §3 (part), 1997; Ord. 1758 §1 (part), 1995) Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 23 Off -Street Parking Area Dimensions TMC 18.56.040 A B C D E F Parking Angle Stall Width Stall Depth Aisle Width Curb Length Unit Width 1-way traffic 2-way traffic 1-way traffic 2-way traffic 0° 8* 8* 12 20 20* 28* 36* 8.5 8.5 12 20 23 29 37 30° 8* 8.5 9 9.; 15* 17 17.5 18 11 11 11 11 20 20 20 16* 17 18 41* 45 46 54* 54 55 20 10 47 56 45° 8* 8.5 9 9.5 17* 19.5 20 20 12.5 12.5 12 20 20 20 11.5* 12 12.7 46.5* 51.5 52 54* 59 60 12 20 13.4 52 60 60° 8* 8.5 9 9.5 18* 21 21 21 17.5* 17.5 17 16.5 20 20 20 9.2* 9,8 10.4 53.5 59.5 59 56* 62 62 20 11 58.5 62 90° 8* 8.5 9 9.5 16* 19 19 19 24 24 23 22 25 25 24 24 8* 8.5 9 56* 62 61 57* 63 62 9.5 60 62 *These figures are for use with compact cars only. Any bays that contain combined compact and normal spaces shall be designed for normal spaces. Curb Length (E) Aisle (D) t stall width or depth (t3 or C) 1L Aisle or Street Stal Depth Perpercular to Aisle (C) Cub Length (E) Unit Width (F) Angled Parking Parallel Parking Figure 18-6 Off -Street Parking Area Dimensions Tukwila Proposed Amended Development Code Draft, August 8, 2016 Page 24 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, UPDATING REGULATIONS REGARDING SURFACE WATER MANAGEMENT; REPEALING ORDINANCE NO. 2064, AS CODIFIED AT TUKWILA MUNICIPAL CODE CHAPTER 14.30, "SURFACE WATER MANAGEMENT"; PROVIDING FOR SEVERABILITY; AND j ESTABLISHING AN EFFECTIVE DATE. WHEREAS, the Federal Clean Water Act requires protection of water quality through implementation of water quality protection measures; and WHEREAS, the National Pollutant Discharge Elimination System (NPDES), administered by the Environmental Protection Agency (EPA), is one of the primary mechanisms for achieving the objectives of the Federal Clean Water Act; and WHEREAS, the EPA has delegated responsibility to administer the NPDES permit program to the State of Washington pursuant to Chapter 90.48 RCW, which defines the Department of Ecology's authority and obligations in administering the program; and WHEREAS, the City of Tukwila ("City") is regulated under the Washington State Department of Ecology's Western Washington Phase II Municipal Stormwater Permit (the "Permit"); and WHERAS, the Permit extends the coverage of the NPDES permit program to certain "small" municipal separate stormwater sewer systems (MS4), some of which are located within the City of Tukwila; and WHEREAS, stormwater management procedures established in 200410 by City of Tukwila Ordinance No. 2064 2274 and amended by 2423 no longer effectively address the surface water management requirements outlined above; and WHEREAS, the City Council deems it to be in the best interest of public safety, health and welfare for its citizens to enact the new surface water regulations; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, HEREBY ORDAINS AS FOLLOWS: Section 1. Regulations established. New surface water management provisions, to be codified at Tukwila Municipal Code (TMC) Chapter 14.30, are hereby established to read as follows: 14.30.010 Authority. A. The Public Works Director shall administer TMC Chapter 14.30. The Director's authority includes the establishment and publication of regulations and procedures to supplement and implement this Chapter, approval of permits and exceptions, and enforcement and implementation of measures necessary to carry out the intent of TMC Chapter 14.30. Such regulations and procedures shall be incorporated within Chapter 5 of the Public Works Infrastructure and Design and Construction Standards, as amended, revised or re -adopted from time to time and hereinafter known and referred to as the Public Works Surface Water Regulations and Procedures. W:\PW Eng\PROJECTS \A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc W:\Word Processing\Ordinances \Surface Water Management Chapter 11.30.doc GV:ksn 8/23/20168/19/2016 Page 1 of 15 B. The Public Works Director may initiate all required actions to prevent or stop acts or intended acts of an applicant or other person that constitute a hazard to life or safety; endangered property; or adversely affect the safety, use or stability of a public way, surface water, a conveyance system or a sensitive area or buffer. C. If the Director determines that a person engaged in an activity that could or does negatively affect surface water has failed to comply with City code or with approved surface water plans and/or other permit conditions, the Director may implement any or all of the following enforcement actions: 1. Suspend or revoke without written notice any surface water permit issued by the City, when the Director determines an immediate danger to life, safety or property exists in a downstream area or adjacent property. 2. Serve a written notice of violation upon that person by registered or certified mail or personal service. The notice shall set forth the measures necessary to achieve compliance, specify the time to commence and complete corrections and indicate the consequences for failure to correct the violation. 3. Suspend or revoke any surface water permit issued by the City after written notice is given to the applicant for any of the following reasons: a. Any violation(s) of the conditions of the surface water permit; b. Changes in site runoff characteristics upon which a permit or exception was granted; c. Construction not in accordance with the approved plans; or d. Non-compliance with correction notice(s) or "stop work" order(s) issued for the construction of temporary or permanent stormwater management facilities. 4. Post a "stop work" order at the site directing that all activities that could affect surface water or a conveyance system cease immediately. The "stop work" order may include any discretionary conditions and standards adopted in TMC 14.30.070 that must be fulfilled before any work may continue. 14.30.020 Purpose. The provisions of TMC Chapter 14.30 shall be liberally construed to accomplish the following purposes: 1. Promote sound development policies and procedures that protect and preserve the City's water courses, groundwater and surface water infrastructure; 2. Protect surface water conveyance systems and receiving waters from pollution, mechanical damage, excessive flows and other conditions that increase erosion and/or turbidity, siltation and other pollution, or that will reduce groundwater recharge or endanger aquatic and benthic life within surface waters and receiving waters within the State; 3. Meet the requirements of State and federal law; 4. Fulfill the City's responsibilities as trustee of the environment for future generations; 5. Promote the health, safety and welfare of the public; 6. Protect private and public property from drainage -related damage; 7. Promote site planning and construction practices that are consistent with natural topographical, vegetative and hydrological conditions; and 8. Preserve and enhance the suitability of water bodies for recreation and wildlife habitat. W_APW E'iAPROTECTS\A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 KCSWDM Ordinance \Draf_ 2016 KCSWDM Ord 2.doc 14.30.doe GV:ksn 8/23/20168/19/2016 Page 2of15 14.30.030 Definitions. Unless specifically defined below, words or phrases used in TMC Chapter 14.30 shall be interpreted using the meaning they have in common usage and to give TMC Chapter 14.30 its most reasonable application; provided that words or phrases not defined herein that are defined in the City of Tukwila Surface Water Design Manual or Stormwater Pollution Prevention Manual, shall have the meaning given therein. 1. "Applicant" means any person, governmental agency or other entity that executes the necessary forms to procure official approval of a project or a permit to carry out construction of a project. Applicant also means any person, governmental agency or other entity that is performing or plans to perform permitted work within the City. 2. "Approval" means proposed work or completed work conforming to TMC Chapter 14.30 as approved by the Director. 3. "Best Management Practice" means those practices which provide the best available and reasonable physical, structural, managerial or behavioral activity to reduce or eliminate pollutant loads and/or concentrations leaving a site. 4. "City" means the City of Tukwila or the City Council of Tukwila. 5. "Comprehensive Surface Water Management Plan" means a plan adopted by the City Council to guide the physical growth and improvement of the City and urban growth management area, including any future amendments and revisions. 6. "Conveyance system" means naturaland man-made drainage features that collect, convey, channel, hold, inhibit, retain, detain, infiltrate, divert, treat or filter surface water. Natural drainage features include swales, streams, rivers, lakes and wetlands. Man-made features include gutters, ditches, pipes and detention/retention facilities. 7. "Critical drainage area" means an area, as determined by the City, needing additional controls to address flooding, drainage, and/or erosion conditions that pose an imminent likelihood of harm to the welfare and safety of the surrounding community. 8. "Development" means any man-made change of improved or unimproved real estate; the construction, reconstruction, conversion, structural alteration, relocation or enlargement of any structure; any mining, excavation, landfill, clearing or land disturbance; or any use or extension of the use of land. 9. "Director" means the Director of Public Works or his or her designee. 10. "Drainage review" means an evaluation by the City to determine compliance with the City's standards and adopted Surface Water Management Manual. 11. "Erosion" means detachment and transport of soil or rock fragments by water, wind, ice, etc. 12. "Illicit discharge" means all non -surface water discharges to surface water conveyance systems that cause or contribute to a violation of State water quality, sediment quality or ground water quality standards. These discharges include sanitary sewer connections, industrial process water, interior floor drains, car washing and grey water systems. 13. "Low impact development *(LID)" means use of innovative or creative approaches to site design, using methods Such as retention of natural vegetation, significant reduction of effective impervious surface, enhanced infiltration and changes in traditional site features such as roads and structures to achieve dramatically reduced or zcro drainage discharge from the site after development means a stormwater and land use ;management strategy that strives to mimic pre -disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by W:APW Eng\PRO[ECTS\A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant \Otak LID Gap Analysis\2016 KCSWDM Ordinance\Draft 2016 KCSWDM Ord 2.doc W:` i" 1-" 3,.n dr.�.c�ooe c GV:ksn 8/23/20168/19/201€, Page 3 of 15 emphasizing conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. 14. "Plans" means the plans, profiles, cross sections, elevations, details and supplementary specifications, showing the location, character, dimensions and details of the work to be performed. These plans are approved by the Public Works Director and are usually signed by a registered professional engineer licensed in the State of Washington. 15. "Pollutant" means anything which causes or contributes to pollution. Pollutants may include, but are not limited to: paints, varnishes and solvents; oil and other automotive fluids; non -hazardous liquid, solid waste and yard waste; refuse, rubbish, garbage, litter or other discarded or abandoned objects, ordnance and accumulations, so that same may cause or contribute to pollution; floatables; pesticides, herbicides and fertilizers; hazardous substances and wastes; sewage, fecal coliform and pathogens; dissolved and particulate metals; animal waste; waste and residue that results from constructing a building or structure; and noxious or offensive matter of any kind. 16. "Pollution" means contamination or other alteration of the physical, chemical, or biological properties of waters of the State that will or is likely to create a nuisance or render waters harmful, detrimental or injurious 1) to public health, safety or welfare, or 2) to domestic, commercial, industrial, agricultural, recreational or other legitimate beneficial uses, or 3) to livestock, wild animals, birds, fish or other aquatic life. Contamination includes discharge of any liquid, gas or solid radioactive or other substance. Alteration includes temperature, taste, color, turbidity or odor. 17. "Project" means activity encompassing all phases of the work to be performed and is synonymous to the term "improvement" or "work." 18. "Runoff" means water originating from rainfall and other precipitation that is found in drainage facilities, rivers, streams, springs, seeps, ponds, lakes and wetlands, as well as shallow groundwater and that portion of precipitation that becomes surface flow and interflow. 19. "Sediment" means fragmented material originating from weathering and erosion of rocks or unconsolidated deposits, which is transported by, suspended in or deposited by water. 20. "Sedimentation" means the deposition or formation of sediment. 21. "Single-family residence" means a project that constructs or modifies one single family dwelling unit and/or makes related on -site improvements, such as a driveway, outbuildings or play courts. 22. "Surface water plan" means a set of drawings and documents submitted as prerequisite to obtaining a development permit. 23. "Stormwater" means surface water. 24. "Stormwater drainage system" means conveyance system. 25. "Surface flow" means flow that travels overland in a dispersed manner (sheet flow) or in natural channels or streams or constructed conveyance system. 26. "Surface Water" means that portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow channels or pipes into a natural drainage system, a surface water conveyance system or into a constructed surface water facility. 27. "TMC" means the Tukwila Municipal Code. W:\PW Eng\PRQIF'CTS\A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant \Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc 14.30.doc GV:ksn 8/23/20168/19/2016 Page 4 of 15 28. "Typical" means the guidelines that shall be followed unless the Director approves an exception. 29. "Water body" means a creek, stream, pond, wetland, lake or river. 30. "Watershed" means a geographic region within which water drains into a particular river, stream or water body as identified and numbered by the State of Washington Water Resource Inventory Areas (WRIAs) as defined in the Washington Administrative Code. 14.30.040 Applicability. TMC Chapter 14.30 applies to all development activities occurring within the City limits that could affect surface water. 14.30.050 Compliance. A. TMC Chapter 14.30 contains minimum requirements. The requirements do not replace, repeal, abrogate, supersede or affect any other more stringent requirements, rules, regulations, covenants, standards or restrictions. Where TMC Chapter 14.30 imposes requirements that provide more protection to human health or the environment, the requirements of TMC Chapter 14.30 shall prevail. B. Approvals and permits granted under TMC Chapter 14.30 do not imply waiver of other laws and regulations, nor do they indicate compliance with other laws and regulations. C. Compliance with the minimum standards and requirements set forth in TMC Chapter 14.30 and related regulations, standards and manuals adopted by the City does not necessarily mitigate all impacts to human health and the environment. In such cases, the applicant must implement additional mitigation to protect human health and the environment. D. City departments shall comply with all the requirements of TMC Chapter 14.30, with the exception of obtaining permit and approvals from the City for works performed in the public rights -of -way, or for operation and maintenance activities by the Department of Parks and Recreation. E. Unless otherwise required by law, in the event of a conflict or inconsistency between a standard or requirement of this chapter and a standard or requirement of the Public Works Surface Water Regulations and Procedures, the SWDM, the DOE SWDM or the SPPM, this chapter shall control to the extent of the conflict or inconsistency; provided that, if a requirement or standard of the Public Works Surface Water Regulations and Procedures, SWDM, DOE SWDM or SPPM, is more restrictive, i.e., provides more protection to human health or the environment, then the more restrictive requirement or standard shall control. For example, if a particular core requirement exemption allowed under the SWDM is not allowed pursuant to the Public Works Surface Water Regulations and Procedures, the more restrictive standard of the Public Works Surface Water Regulations and Procedures will apply. 14.30.060 Standards. All development activities within the City shall be undertaken in accordance with the following minimum standards, except that depending on a project's possible impact to public and environmental health and safety, the Director may require stricter standards: 1. The City's National Pollutant Discharge Elimination System (NPDES) permit. 2. The 2009 2016 King County Surface Water Design Manual (hereafter known and referred to as "KCSWDM"), attached hereto as "Exhibit A" (or in the alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Surface Water Design Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Surface Water Design Manual or the SWDM. The Director will review subsequent amendments to the KCSWDM and will make recommendations to the City Council for adoption as needed and as applicable, W:\PW Eng \ PROIECTS \ A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant \Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc 11.30.doc GV:ksn 8/23/20168/19/201G Page 5 of 15 or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 3. The Department of Ecology 2005 2012 Stormwater Management Manual for Western Washington, hereafter known and referred to as the "DOE SWDM," may be used for project design for multi -jurisdictional development projects wherein a substantial and material portion of the development project will take place outside of the jurisdictional boundaries of the City and will be required by a permitting authority to comply with the standards set forth in the DOE SWDM; provided that the Public Works Director approves of the DOE SWDM based upon a finding that application of differing standards set forth in the SWDM and the DOE SWDM will create a hardship for the applicant, and that approval of use of the DOE SWDM will not result in requirements that are less restrictive than the SWDM or otherwise inconsistent with the purpose of this chapter. 4. The 2009 2016 King County Stormwater Pollution Prevention Manual, hereafter known and referred to as "KCSPPM," attached hereto as Exhibit B (or in alternative) as filed in the City Clerk's Office, is hereby adopted by reference as the City of Tukwila Stormwater Pollution Prevention Manual and, together with the amendments thereto as set forth in this section, shall be known and referred to as the Stormwater Pollution Prevention Manual or the "SPPM." The Director will review subsequent amendments to the KCSPPM and will make recommendations to the City Council for adoption as needed and as applicable, or will adopt and implement necessary administrative regulations and/or procedures pursuant to the Director's authority under TMC Section 14.30.010(A). 5. The Public Works Surface Water Regulations and Procedures. 6. Development design and construction shall meet all of the applicable standards and codes, recommendations in specific reports, such as the geo-technical report and the Technical Information Report, and design criteria contained in the Comprehensive Surface Water Management Plan or Drainage Basin Plans. 7. Unless the context indicates otherwise, the following terms and phrases, as used in the SWDM or the SPPM, shall have the meaning or reference given. Table 14.1 Tukwila Terminology Equivalents to King County Terminology King County Term City of Tukwila Term Agricultural Project Term does not apply. Critical Drainage Area Critical Drainage Area means an area as determined by the City needing additional controls to address flooding, drainage and/or erosion condition that poses an imminent likelihood of harm to the welfare and safety of the surrounding community. DDES1 City of Tukwila Department of Community Development. DNRP1 City of Tukwila Department of Community Development. Director City of Tukwila Public Works Director. King County City of Tukwila. King County Road Standards City of Tukwila Infrastructure Design and Construction Standards and the requirements of the City of Tukwila Transportation Public Works Department Surface and Water Utility as applicable. Water and Land Resource Division City of Tukwila Public Works. Zoning Classifications: These zoning classifications are intended for areas outside the Urban Growth Boundary; therefore the City W:APW Fng\PRQ E(TS\A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant \Otak LID Gap Analysis \ 2016 KCSWDM Ordinance\ Draft 2016 KCSWDM Ord 2.doc 14.30.doc GV:ksn tit 23.Z 20168/ 19/2016 Page 6 of 15 Agriculture (A); of Tukwila contains no equivalent zoning. Refer to City Forest (F); Rural (Z) of Tukwila zoning maps and designations. 'Other terms used in the KCSWDM to reference other King County staff or departments shall also refer to the City of Tukwila Department of Community Development. 8. All references in the SWDM or the SPPM to the following King County codes, or any section thereof, shall be replaced by reference as indicated in Table 14.2 to the applicable code and comparable section thereof. Table 14.2 Tukwila Municipal Code Equivalent to King County Code' King County Code (KCC) Description Tukwila Municipal Code (TMC) Description KCC 2.98 Critical Drainage Areas TMC 14.30 WATER AND SEWER — Stormwater Management KCC 16.82 BUILDING AND CONSTRUCTION STANDARDS — Clearing and Grading TMC 16.54 BUILDING AND CONSTRUCTION — Grading KCC 21A.14 Development Standards Design Requirements TMC 14.30 WATER AND SEWER — Stormwater Management KCC 21A.24 Critical Areas TMC 18.45 ZONING — Environmentally Sensitive Areas KCC 21A.06 Technical Terms and Land Use Definitions TMC 18.08 ZONING — Districts Established - Map KCC 20.14 Basin Plans TMC 14.30 WATER AND SEWER — Stormwater Management ZONING — Shoreline Overlay District KCC 25 Shoreline Management TMC 18.44 KCC 9 KCC 9.02 KCC 9.04 KCC 9.08 KCC 9.12 KCC 9.14 Surface Water Management General Provisions Surface Water Runoff Policy Surface Water Management Program Water Quality Groundwater Protection TMC 14.30 TMC 18.45 WATER AND SEWER — Stormwater Management ZONING — Environmentally Sensitive Areas 1This table identifies the main City municipal code chapters that contain information/requirements for the City where the SWDM references the King County code. There may be other instances where other City code chapters also apply. 9. All references in the SWDM and SPPM to the following maps shall be replaced by reference as indicated in Table 14.3. Table 14.3 Tukwila Maps Equivalent to King County Maps or Designation King County Map or Designation City of Tukwila Map or Designation Coal Mine Hazard Areas Map Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Landslide Hazard Area and Landslide Drainage Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are W:\PW Enl;\PROJECTS \A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak [ID Gap Analysis \ 2016 KCSWDM Ordinance\Draft 2016 KCSWDM Ord 2.doc 14.30.doc GV:ksn 8/23/20168/19/2016 Page 7 of 15 Areas Map available at the Department of Community Development service desk. Water Quality Applications Map Not applicable. Aquatic areas (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Wetlands (as defined in KCC 21A.06) Maps delineating stream and wetland types and their associated buffers within Tukwila are available at the Department of Community Development service desk. Seismic Hazard Areas Defined and regulated through the Washington State Building Code. Flood Hazard Area (as defined in KCC 21A.06) Flood Plain Management will be regulated through TMC 16.52. Flood Insurance Rate Maps available from the Public Works Department and the areas marked those A V. on maps with an or Steep Slope Hazard Area (no map referenced in the KCSWDM) Maps delineating landslide areas, steep slopes and coal mine hazard areas within Tukwila are available at the Department of Community Development service desk. Critical Aquifer Recharge Area (as defined in KCC 21A.06) Not applicable. Wildlife Habitat Conservation Area (as defined in KCC 21A.06) Fish and wildlife habitat conservation areas will be regulated through TMC Chapter 18.44, Shoreline Overlay District and the regulations in TMC Chapter 18.45 related to wetlands and watercourses. Wildlife Habitat Networks (as defined in KCC 21A.06) No equivalent. All references in the SWDM to the Stormwater Pollution Prevention Manual shall mean and refer to the SPPM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. All references in the SPPM to the Stormwater Design Manual shall mean and refer to the SWDM as adopted by the City of Tukwila pursuant to this Chapter 14.30 of the Tukwila Municipal Code. The definition of Critical Drainage Area in Chapter 1 of the SWDM is amended by striking "by administrative rule under the procedures specified in KCC 2.98." The reference in Section 1.1.2.4 of the SWDM to Urban Planned Development shall mean and refer to the equivalent such designation under the City of Tukwila Comprehensive Plan as determined by the City of Tukwila Community Development Director. The note following the third sentence of Section 1.1.3 of the SWDM is stricken. The last paragraph of Section 1.1.4 beginning with "Additional mitigation" is stricken. The reference in Section 1.2.2 at paragraph 2 of the SWDM to KCC 21A.24.110 shall mean and refer to the applicable provision of Title 19 of the Tukwila Municipal Code. All references to Critical Area Review in the SWDM and the SPPM shall mean and refer to Critical Area Review pursuant to Title 18 of the Tukwila Municipal Code. IN:\ PW Frig \ PROJECTS \A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 K('SW DM Ordinance \ Draft 2016 KCSWDM Ord 2.doc i n n .7, zz-3�o:c�vc GV:ksn 8/23/20168/19/2016 Page 8 of 15 References in the SWDM and SPPM to Chapter 16.82 of the King County Code shall mean and refer to the clearing and grading provisions of Title 16 of the Tukwila Municipal Code. Subsection F of Section 1.2.4.3 of the SWDM is omitted. The reference in Section 1.2.7 to King County Ordinance 12020 shall mean and refer to the financial guarantee requirements of the applicable provisions of the Tukwila Municipal Code or the Public Works Surface Water Regulations and Procedures. Section 1.4.4 of the SWDM is stricken and replaced with the following: All variances ("Adjustments") from Chapter 14.30 of the TMC, the SWDM and the SPPM shall be governed by the procedures, standards and requirements set forth in Chapter 18.72 of the Tukwila Municipal Code, as it now exists or may hereafter be amended. The reference in Section 1.4.5 of the SWDM to KCC 20.20 shall mean and refer to the applicable provisions of Title 18 of the Tukwila Munici s al Code. References to offices of King County shall mean and refer to the equivalent offices of the City of Tukwila. Except when the context indicates otherwise, references in the SWDM and the SPPM to specific codes or sections of codes of King County, such as the King County critical areas code, shoreline management code, clearing and grading code, and road standards, shall mean and refer to the equivalent codes or sections of codes of the City of Tukwila. 14.30.070 Permits. A. The application for and issuance of a surface water/storm drainage permit constitutes the administrative mechanism for the enforcement of the provisions contained herein. Such permits shall be non -transferable without approval of the Public Works Director and shall be limited to the specific activities for which they are granted. B. Activities that trigger drainage review pursuant to the Surface Water Design Manual require a permit. Permit application shall be made to the City's permit center. C. All plans, drawings and calculations shall be prepared, stamped, signed and dated by a registered professional engineer, licensed in the State of Washington. A single-family residence that is not in a sensitive area and does not trigger drainage review may be exempt from this requirement. D. The submittals for the permit must meet or exceed the minimum criteria in the Surface Water Design Manual and the City's Development Guidelines and Design and Construction Standards. The Director may require additional submittals to those described therein. E. Any significant changes to the approved plans or specifications of a permitted project require a revision submittal to the City for approval before the changes are implemented. 14.30.080 Stormwater Drainage System Maintenance and Inspection Requirements. A. All Stormwater Drainage Systems. All public and private stormwater drainage systems providing permanent stormwater treatment and/or flood control shall be inspected and maintained in accordance with the standards contained in the Surface Water Design Manual. The following are additional minimum standards for the maintenance of all stormwater drainage systems: 1. All stormwater treatment and flow control components of stormwater drainage systems shall be inspected annually, but the frequency of such inspections W:\PW Ent;\PROTECTS \A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak I.ID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc W:\Word Procc;ring\Ordinances \Surface Water Management Chapter GV:ksn123/20168/19/2015 Page 9 of 15 may be reduced based on inspection records. Owners of private stormwater drainage systems shall be responsible for maintenance, inspection and corrections. The City will perform periodic inspections of these same stormwater drainage systems. 2. When an inspection identifies an exceedance of the maintenance standard, maintenance shall be performed by the owner or person in control of the stormwater drainage systems within the following time period: a. Within one year for wet pool facilities, infiltration facilities, and detention facilities including detention pipes, ponds and valves; b. Within six months for routine maintenance operations; c. Within nine months for maintenance requiring re -vegetation; and d. Within two years for maintenance that requires capital construction of less than $25,000.00. 3. The Director or his or her designee may order corrective maintenance to occur within a specific time period. 4. The Director has unlimited access — at all reasonable times — to any property whenever the Director has reasonable cause to believe violations of TMC Chapter 14.30 are present or operating on a subject property, whenever necessary to make an inspection or perform activities to enforce any provisions of TMC Chapter 14.30, whenever necessary to monitor proper function of drainage facilities or whenever the condition of a surface water system presents imminent hazard. 5. When the City has given a stormwater drainage system owner or person in control prior notification and the owner or person in control has failed to maintain such stormwater drainage system or when conditions make it impossible to give prior notice, the City may perform the required maintenance or repairs with the cost of said work assessed as a lien against the properties responsible for the maintenance. This action shall be in addition to any other enforcement provisions provided in TMC Chapter 14.30. 6. Maintenance of private stormwater drainage systems and implementation of best management practices are the responsibility of the owners and persons in control of the stormwater drainage systems. 7. If the property owner(s) or person in control does not maintain the stormwater drainage system as prescribed in the approved maintenance schedule, the Director may issue a written notice specifying the required actions and setting a time frame for completion of the specified actions. If these corrective actions are not performed in a timely manner, the City or a private contractor hired by the City may enter the property to perform the actions and bill the property owner(s) and/or person in control for the cost of the work. In the event the Director determines a hazard to public safety exists, written notice is not required. B. New Facilities. 1. For privately -owned stormwater drainage systems, the applicant shall provide a monitoring and maintenance schedule for the life of each stormwater drainage system or component thereof or best management practice resulting from the development. At a minimum, the schedule shall describe the maintenance activities, spell out the frequency for each activity and state who performs and who pays for each activity. 2. The monitoring and maintenance schedule shall provide unlimited access, at all reasonable times, to the stormwater drainage systems for inspection by the Public Works Department. W:\PW Eng\PROJECTS \A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant \Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc W:\Word Procering\Ordinances \Suit. le... 1 g,�ux,i.lilnet,kt 11.?,0.doc GV:ksn8/23/20168/19/2016 Page 10 of 15 3. The Director shall review and approve the monitoring and maintenance schedule before the applicant records the schedule with King County Records. 4. Owners of projects distributing over one acre must maintain records of facility inspections and maintenance actions. Records shall be retained for a period of at least ten years. These maintenance records are to be provided to the City upon request. 5. For new residential developments in excess of 1 acre, additional inspections are required of all new flow control and water quality treatment facilities, including catch basins, every six months during the period of heaviest residential construction (i.e., 1 to 2 years following subdivision approval) to identify maintenance needs and enforce compliance with maintenance standards as needed. The City will perform periodic inspections of these same stormwater drainage systems. 14.30.090 Special Drainage Fee. When the City accepts stormwater drainage system infrastructure that requires upkeep in excess of normal maintenance, the City has the right to charge the benefiting parties a special drainage fee in addition to the City's normal surface water charge, as condition of turnover, in order to cover costs for this maintenance. 14.30.100 Inlet Marking. A. All new inlets and catch basin grates, public or private, shall be marked "No Dumping! Drains to Stream." In addition, a four inch raised pavement marking that states "No dumping Drains to Streams" or equivalent as approved by the Public Works Director. B. Existing inlets and catch basin gratess, in areas being resurfaced or when being modified or replaced, shall be marked "No Dumping! Drains to Stream." In addition, a four inch raised pavement marking that states "No dumping Drains to Streams" or equivalent as approved by the Public Works Director. C. The marking shall meet the standard in the City's Development Guidelines and Design and Construction Standards. 14.30.110 Financial Guarantees. A. The Public Works Director may require from the applicant a surety, cash bond, irrevocable letter of credit or other means of financial guarantee acceptable to the City, prior to approving the permit. B. The amount of the financial guarantee shall not be less than the total estimated construction cost of all interim and permanent stormwater control facilities and shall not be fully released without final inspection and approval of completed work by the City. C. For developments that may involve a risk of property damages or possible hazards, the Public Works Director may require the provision of financial guarantee (bond, note, letter of credit, etc.) with the City to mitigate damages should they occur. The following provisions shall apply in instances where such financial guarantees are required: 1. Such bond or other proof of financialguarantee shall not exceed 150% of the estimated cost of constructing and maintaining those improvements which are the source of the risk or potential hazard; provided that, in the case of surface water activities which do not involve expenditures at least equal to the cost of remedying the possible adverse impacts of such activities, the required financial guarantee shall be equal to City staff's best estimate of the possible cost directly associated with remedying the adverse impacts to public or private properties not associated with the development. W:\PW Eng\PROJECTS \A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc W:\Word Proccrring\Ordinances \Surface Water Management Chapter 14.30.doc GV:ksn8/23/201614/19/2016 Page 11 of 15 2. The amount of any financial guarantee shall not serve as a gauge or limit to the compensation collected from a property owner because of damages associated with any surface water activity. D. The City shall retain the financial guarantee until the completion of any project involving surface water activity or following a prescribed trial maintenance period. E. The City of Tukwila may redeem financial guarantees provided in accordance with this provision in whole or in part upon determination by the Public Works Director that any or all of the following circumstances exist: 1. Failure on the part of the party providing such financial guarantee to fully comply, within the time specified, with approved plans and/or any corrective or enforcement actions mandated by TMC Chapter 14.30; or, 2. Damages to public or private property arising from the activities for which the financial guarantee was required. 14.30.120 Insurance. A. If, in the opinion of the Public Works Director, the risks to property or life and safety associated with a proposed development activity are substantial, said official may require the property owner to purchase liability insurance coverage in the following minimum amounts: 1. Bodily injury liability - $1 million per occurrence. 2. Property damage liability - $1 million per occurrence. B. The Public Works Director may require higher policy limits than set forth in TMC Section 14.30.120A in those cases where the minimum amounts are deemed insufficient to cover possible risks. All insurance policies obtained in accordance with these provisions shall name the City of Tukwila as an "additional insured," and shall be written by a company licensed to do business in the State of Washington. Neither issuance of a permit, nor compliance with these provisions or any other conditions imposed by the City relieves any person from responsibility for damage to persons or property otherwise imposed by law, nor for damages in an amount greater than the insured amount. Issuance of a permit shall not form the basis of liability against the City for damages to persons or property arising from the development activities permitted by the City or otherwise undertaken by any person. 14.30.130 Exceptions. A. Requested by Applicant. 1. The Director may grant a written exception from any requirements of TMC Chapter 14.30 if there are exceptional circumstances applicable to the site such that strict adherence to the provisions contained herein will result in unnecessary hardship and not fulfill the purpose of TMC Chapter 14.30. The cost to design and construct the improvements shall not constitute hardship and shall not form the basis for an exception. 2. The applicant shall provide the Director a written request stating the specific exception sought and the reasons supporting the exception. 3. The Director may grant an exception to TMC Chapter 14.30 only if all of the following criteria are met: a. Strict compliance with the provisions of TMC Chapter 14.30 may jeopardize project feasibility and reasonable use of property; b. Proposed drainage facilities are consistent with the purpose and intent of TMC Chapter 14.30; W:\PW Eng\PROIECTS\A- DR Projects \ NPDES Program (99341210)\2015 2017 Capacity Grant\Otak t 1D Gap Analysis\2016 KCSWDM Ordinance\Draft 2016 KCSWDM Ord 2.doc L3 oc GV:ksn 8/23/20168/19/2016 Page 12 of 15 c. Granting the exception or standard reduction will not be detrimental to the public welfare, public safety, existing drainage systems or other property in the drainage basin; and d. The recommendation of a registered civil engineer supports the exception. B. Low Impact Development. 1. In order to achieve the City's goal of increasing the amount of development with less impervious surface, the Director may approve exceptions to Public Works standards, including street standards. Exceptions requiring approval under the land use codes, such as parking and landscaping, must be made to the Department of Community Development. 2. The applicant shall provide justification for each exception and shall show that the project meets all other TMC requirements and that the project has a reasonable assurance of long-term success. 3. Each exception shall be assessed on the following criteria: a. The result will compensate for or be comparable with surface water flow control and treatment that is in the public's interest; b. The exception contributes to and is consistent with achieving low effective impervious surface area within a development; c. The exception contains reasonable assurances that low effective impervious surfaces will be achieved and maintained; d. Granting of the exception will not threaten public health and safety; e. The exception meets or is consistent with generally accepted engineering design practices; f. The exception promotes one or more of the following: (1) Innovative site or housing design; (2) Increase in on -site surface water retention using native vegetation; (3) Retention of at least 60% of natural vegetation conditions over the site; (4) Improved on -site water quality beyond that required in current standards adopted by the City; (5) Retention or recreation of predevelopment and/or natural hydrologic conditions to the maximum extent possible; and (6) Reduction of effective impervious surface to lowest extent practicable. g. The exceptions do not present significantly greater maintenance requirements at facilities that will eventually be transferred to the public ownership; h. Covenant, conditions and restrictions necessary for native growth protection easements, impervious surface restrictions and other such critical features necessary for the exceptions will be recorded against and will be binding against all affected properties. C. The Director may require a monitoring and evaluation plan in order to measure performance of specific elements in the exceptions. D. The Director may require a performance bond for 150% of the installation cost of the exceptions. E. The Director may require a two-year maintenance bond for 20% of the construction cost. W:\PW Eng\PROTECTS\A- DR Projects\NPDES Program (99341210) \ 2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc W:\W rd Pr cc sing\Ordinance\Surface Water Management Chapter 14.30.doc GV:ksn L23/20168/19/2016 Page 13 of 15 14.30.140 Liability. Liability for any adverse impacts or damages resulting from work performed in accordance with any permit issued on behalf of the City of Tukwila for the development of any site within the City limits shall be the sole responsibility of the applicant. 14.30.150 Penalties. The following penalties shall be applied in whole or in part for the violation of permit conditions or for the failure to obtain permits required for activities regulated by TMC Chapter 14.30. All remedies shall be considered cumulative in addition to any other lawful action. Each day that a violation of this code is committed or permitted to continue constitutes a separate offense to which both the civil and criminal penalties set forth below shall apply. 1. The violation of or failure to comply with any order or requirements made in accordance with the provisions of TMC Chapter 14.30 is a civil violation. The provisions of TMC Chapter 8.45 shall be used to enforce this code. 2. It shall not be a defense to the prosecution for failure to obtain a permit required under TMC Chapter 14.30 that a contractor, subcontractor, person with responsibility on a site or person authorizing or directing the work erroneously believed a permit had been issued to the property owner or any other person. 14.30.160 Abatement. The City may abate any surface water activity that is deemed a public nuisance and is performed in violation of TMC Chapter 14.30 or any lawful order or requirement of the Director. 14.30.170 Injunctive Relief. A. Whenever the City has reasonable cause to believe that any person is violating or threatening to violate TMC Chapter 14.30 or any rule or other provision adopted or issued pursuant to TMC Chapter 14.30, it may either before or after the institution of any other action or proceeding authorized by TMC Chapter 14.30 institute a civil action in the name of the City for injunctive relief to restrain the violation or threatened violation. Such action shall be brought in King County Superior Court. B. The institution of an action for injunctive relief under TMC Chapter 14.30 shall not relieve any party to such proceedings from any penalty prescribed for violations of TMC Chapter 14.30. 14.30.180 Appeals. The appeals process for/by any person aggrieved by the action of the City is provided under TMC Chapter 8.45, "Enforcement." Section 2. Repealer. Ordinance No. 2064 is hereby repealed. Section 3. Severability. If any section, subsection, paragraph, sentence, clause or phrase of this ordinance or its application to any person or situation should be held to be invalid or unconstitutional for any reason by a court of competent jurisdiction, such invalidity or unconstitutionality shall not affect the validity or constitutionality of the remaining portions of this ordinance or its application to any other person or situation. Section 4. Effective Date. This ordinance or a summary thereof shall be published in the official newspaper of the City, and shall take effect and be in full force five day,,On December 31, 2016 after passage and publication as provided by law. PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a Regular Meeting thereof this day of 20102016. ATTEST/AUTHENTICATED: Christy O'Flaherty, CMC, City Clerk rm Haggcrt »� Allan Ekberg, Mayor .,- ----as------ Filed with the City Clerk: W:APW Eng\PRC1EClS\A- DR Projects \NPDFS Program (99341210)\2015 2017 Capacity Grant\Otak LID G Analksis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc 11.30.doc GV:ksn 8/23/2016 i/ I')/2016 Page 14 of 15 APPROVED AS TO FORM BY: Passed by the City Council: Published: Effective Date: Office of the City Attorney Ordinance Number: Attachments: Exhibit A - The 2009 2016 King County Surface Water Design Manual (KCSWDM) Exhibit B - The 2009 2016 King County Stormwater Pollution Prevention Manual (KCSPPM) W:\PW Eng\PROJECTS \A- DR Projects\NPDES Program (99341210)\2015 2017 Capacity Grant\Otak LID Gap Analysis\2016 KCSWDM Ordinance \ Draft 2016 KCSWDM Ord 2.doc 1 GV:ksn 8/23/2016g/19/2016 Page 15 of 15 Greg Villanueva From: Coachman, Luanne <Luanne.Coachman@kingcounty.gov> Sent: Friday, August 12, 2016 4:23 PM To: Greg Villanueva Subject: FW: SWDM - SEPA/DNS Attachments: Determination of Nonsignificance.doc; SEPA Environmental Checklist.docx Luanne Coachman King County bepartment of Natural Resources and Parks Storm►vater Services Section desk: 206.477.4665 fax: 206.296.0192 Iuanne.coachman@kingcounty.gov From: Nielsen, Kris Sent: Friday, August 12, 2016 3:36 PM To: Coachman, Luanne Cc: Wilgus, Mark Subject: SWDM - SEPA/DNS Do you need signed copies? I have the versions that were transmitted to council with the SWDM ordinance package. I don't keep copies of signed documents anymore. They get returned to the project manager for the project files. I hope this helps. Thanks, Kris From: Shannon, Kathleen Sent: Tuesday, December 08, 2015 10:38 AM To: ExecLegislation Cc: Harris, Logan; Isaacson, Mark; Taylor, John; Nielsen, Kris; Crawford, Curt; Wilgus, Mark; Cleveland, Grover Subject: Ordinance - Surface Water Design Manual Title 9 Code Changes Hi Shelley — Here is another ordinance. We would like it to have this transmitted to Council by the end of the year. There are several attachments to the Transmittal Letter: SEPA Environmental Checklist Regulatory Note Determination of Nonsignificance Plain Language Summary 1 Let me know if you have any quest'fons. Thanks. Kathleen 2 New Tukwila Bioretention Plant List Draft August 2, 2016 j L.. AUG 15 2016 Community Development k. FJ V ..�{yq� ,...j i E r(• -,A y Scientific Name Common Name Icy 1 J .�. Carex obnupta Slough sedge1 1 }1 Zone 2 3 Native 11 1 c J .. Sun Exposure Height .. 12"- 36" Spread ....-.._ up to 48" Fall Color Bloom Time&Colo r Characteristics IV Partial Shade A .._ ....._ __.-. Late Spring ..tea__ . .__ _ .... .. .• Spreads quickly; excellent soil binder - _.._... .. Carex oshimensis wx 'Evergold' Variegted Japanese tf . � . Sedge 2 3 `' 12" 24" 24' 36" Late Spring - Earl Summer Y Variegated leaves with white band; great planting along sidewalked es 9 P 9 9 9� rr4 wry �' 'Ir "Y a•r�,���, i11 \n4it' i'lu Carex stipata Sawbeak Sedge 24"-36" 24"-36" Spring Speads quickly; long, tapered foliage N. ,y� e• y<< it , ,', Juncus acuminates Taper -tipped Rush 1 r `f , ; 6"- 18" 12"- 24" Spring Summer Red brown flowers; delicate q \ °x5, i 1 , Juncus ensifolius 1 .a '� �t' Dagger lead Rush 1 6" 15" 6" 9" Summer Pom-pom like flowers; adds interest to landscape xi r Juncus tenuis Slender Rush 1 2 — 6"- 20" 6"- 30" Late Spring Late Summer Bright green foliage ,�,��I 1t ,• ,'� Scirpus acutus Hardstem Bulrush 1 10' 6' Summer Gray -green to dark green foliage; dense Y X f Scirpus microcarpus Small -fruited Bulrush 1 di 24"- 36" 12"-24" Summer Spreads quickly; excellent soil binder ■ ` lw �•. ?. �j� ' s?4 st 4 Scientific Name Common Name V �. Aster chilensis California Aster 1 Zone e / 3 3 a Native Sun Exposure Mature Size Fall Color Bloom Time & Color Characteristic s , — _ ', Partial Shade Height 24"-36" Spread 18"-36" Late Summer rt` Low -growing plant; shear when blooming ceases in the autumn, returns in the spring .:. _ 4' Aquilegia formosa Western Columbine 2 3 4 12"-36" 12"-36" Spring ....ice Excellent in wooland areas; attracts pollinators; tolerant of shallow flooding `ter _ eon -Arctostaphylos UVa-Ursi ;,,i nn Ki i nn iki or k c Bearberry 2 3 # \-- 6" 12" 24" 36" ring - Summer er �\ �/ � :- Glossy, leathery leaves; low -growing ground cover, easy care once established, bell -shaped flowers; red P berries Asarum caudatum Wild ginger 2 3 4" 6" 36" Late Spring Glossy leaves that exude the fragrance of ginger when crushed Athyrium ,k r �_ ' r filix-femina Lady fern 1 2 3 di ab 36"-60" 24" Fast-growing; tolerant of shallow flooding ;:. Blechnum spicant Deer fern 1 2 3 E 111) 12"-36" 24" Late Spring ,;�i.,, r! Dark, glossy leaves with a crinkled texture; tolerant of shallow flooding Y# Camassia quamash Common canvass 2 3 \r'\ - ' , , , 18" 12" Late Spring Distinct clusters of flowers make this plant attractive in mass plantings; best when planted in the autumn after weather cools '' Corpus canadensis ;- - �'r hb ��y Buncer•ry • ti 2 3 • 6"-9" 6"-9" Late Spring / Performs best in full shade; excellent complement to rhododendrons or ferns Scientific Name Common Name •a '� : Dicentra formosa L,'' ' ' Pacific Bleeding Heart � Zone z, 2 3 3 Native Sun Exposure Height 12" Spread 24„ Fall C Color Bloom Time & Colo e r Spring � 1, • o ' Characteristics arac en s Delicate foliage; distinct spring -time flowers , ," Partial Shade Deschampsia ces itosa s x ir Tufted hair grass 2 3 N 1 , ,, - , -y,,,s , 6"-12" z4" Spring �1 - Stunning grassy foliage with creamy white variegation that turns pink in winter; spring -time inflorescence can makeplant4'-tall r e � itb `� .p * Fragaria chiloensis Beach Strawberry 2 3 y ; 11) 10" 36" Summer j Forms a lush, compact groundcover; cut back in the early spring to prompt new growth and prevent stem build-up; ornamental berries Fragaria vesca AI Strawberry Alpine p y 2 3 w A is 10" 36" Bears tiny, fragrant (and edible) berries in the summer months; attracts butterflies; likes some afternoon shade i f; ' ` d r Festuca glauca� Blue fescue 3 R Rom_ 12" 12" Summer �Z Dense plant; blue -gray, silvery foliage; excellent when planted alongside side - walks or used as a groundcover Hemerocallis 2 2_ - ° 4 :: 24" 48" 24" Spring- Summer `�'° ^� 7 Attracts pollinators; flower color dependent on cultivar (pink, red, orange purple, yellow) t ar �' 3 #�. Alumroot • 2 3 24"-36" 18" Spring - Summer -'1,j -� ✓ Many cultivars available; dintinct foliage and flower colors of chartreuse, white, and scarlet .:1„, \ `'' Y ; y �., { 4 4 iana Iris BLUE FESCUE BLUE FESCUE 1 2 3 - ;' 24" 24" Early Spring �►� Clumping foliage; beautiful purple flowers are nice color addition to plant- ing scheme Scientific Name Common Name Iris tenax 1 Oregon Iris LiIlium columbianum Tiger Lily Lupinus Lupine Nothochelone nemorosa Turtlehead Ophiopogon planiscarpos Black Mondo grass Penstemon cardivellii Beard Tongue Penstemon rupicola Rock Penstemon Polystichum munitum Western Sword Fern 2 2 2 3 3 3 3 3 3 3 3 Sun Exposure � � F 18" 5'-6' 18"-48" up to 40" 12" 12"-24" 4" 36"-48" 12" 36" 24"-30" up to 40" 12" 12"-24" 18" 36"-60" Bloom Time & Color Late Spring Mid -Summer Summer o I J Summer Spring/ Summer Early Summer Late Spring - Summer 0 Characteristics Beautiful blue and purple flowers; nice color addition to any planting scheme Produces one to six unscented blooms per stem; attracts butterflies Attacts butterflies and caterpillars; many cultivars available Flowers continuously throughout the summer Black foliage makes this an excellent accent when used with brightly flowering plants; maintains color Beautiful blue and purple flowers; nice color addition to planting scheme; attracts hummingbirds Woody, trailing stems; blue-green leaves Beautiful foliage and size allows this plant to stand out in planting schemes Scientific Name Common Name 1 Sedum spathulifolium 'Cape Blanco' Pacific Stonecrop Sidalcea hendersonii Henderson's Checker -mallow Smilacina racemosa Solomon's Plume Solidago canadensis Goldenrod Tellima grandiflora Fringecup Tiarella trifoliata Western Foamflower Trillium ovatum Western Trillium Vancouveria hexandra Duck's Foot 1 2 2 2 2 2 2 3 3 3 3 3 3 Sun Exposure 116 411, Height 4"-6" 36"-48" 12"-36" 36" 12" 12" 18" 12" Spread 8"-12" 24"-36" 12"-36" 24" 12" 12" 12" 12"-36" Fall Color Bloom Time & Color Spring - Summer Summer 0' Spring Late Summer Spring ) 2 ✓J Summer l Spring JJ Spring Characteristics Spoon -shaped blue-green foliage; trailing stems; excellent as a groundcover Fast-growing Creamy spring -time blossoms are followed by yellow -green berries that turn to red; attracts birds; fragrant flowers Small bright -yellow flowers make a lively addition to any planting scheme; narrow lance -shaped leaves Foliage maintains appearance throughout the winter ( Dense; foliage maintains appearance throughout the winter Unique flower to add to any planting scheme Foliage maintains appearance throughout the winter Scientific Name Common Name ,., ♦� �.., �r 1.1 .j f tx GxYY'(( �i$P' •'r _ _ _ fi .� -p' Cistussalvifolius 'Prostratus' Sageleaf Rockrose Zone 3 Sun Exposure Mature Size Fall Bloom Native Partial Shade Color Height Spread Time & Color Characteristics , , ' : `' ' 2' 6' Spring- Summer ‘ -- Excellent for erosion control on banks; light gray -green leaves . Corms sanguinea r x$t Bloodtwig Dogwood 1 2 3 '. 6' 6' Summer J Stunning red stems in the winter months .:. a1 li h t l .!C 9 tot �e ii ' • � � Corms sericea 'Flavimera' Yellow -Twig Dogwood 1 2 3 8" 5' Summer ��� Stunning yellow stems in the winter months , f ` Cornussericea 'Kelseyi' � � ` �.' Dwarf Red -Twig }? t _! ,,, 1 Dogwood 1 2 3 3' 3' Summer . /� = . Stunning red stems in the winter months ti Gaultheria shallon Salal 2 3 5' S' Spring • , ' ii Fast-growing when planted in shaded areas Holodiscus discolor Cream Bush 3 8' 15'u/ Summer , Attracts pollinators; excellent soil binder :• .r Mahonia aquifolium . f Oregon Grape 2 3 `? 6' 10' S' Spring Attracts pollinators; blue and black berries Osmanthus . x burkwoodii Hybrid Sweet Olive 2 3 �‘ ,, — 6'-10' 8'-12' Spring f J s, - 1_ Leathery, glossy dark -green foliage; excellent when used as a hedge; tolerant of many soils • i Scientific Name Common Name Philadelphus lewisii Mock -Orange 1 Zone � 2 3 3 Native Sun Exposure Mature Size Fan Colo' Bloom Time & Color Characteristics Sun >e { , q PartialShade Height Spread Summer �V Founstain-shaped plant; aromatic flowers 5' 10' S' 10' „ `- Physocarpus capitatus Pacific Ninebark 2 3 — 5' 10' S' 10'!}: Late Spring Dense clusters of flowers; plamts resemble spirea; rejuvenate old plantings by cutting to ground , `' "'* Physocarpos opulifolius Common Ninebark 2 3 - ' 5' 10' 3'-6' Late Spring _ a _ Dense clusters of flowers; plamts resemble spirea; rejuvenate old plantings by cutting to ground ,K iya . ,, aaYy. r Pinus mugo-mugo Dwarf Mugo Pine 3 4' 5' Late Spring Low -growing; performs well, but variable in growing habit great as an anchor plant Rhododendron Rhododendron 2 3 10' (varies) 10' (varies) Spring- Summer (varies) Many cultivars that vary in bloomtime, size, and color; leathery leafed with stunning flowers 4, ,�� f t tx „ -.` Ribes sanguineum Red -Flowering Currant 2 3 � ;0 5' 12' 10' Spring Produces drooping clusters of flowers � �� y 4 , Baldhip Rose 2 3 '� , . 5' 1'-2' Spring - Summer ` Fast-growing to 3; slender;; small rose with delicate stems and flowers; stems are bristled M# .- Rosa pisocarpa Swamp Rose 1 2 3 ,- , 10' 3'-6' Spring - Fall , r n c`_; !> Unique among roses given its preference for wet, almost swampy conditions; stems have thorns Sun Exposure Height Bloom Time & Color Characteristics Rosa nutkana Nootka Rose �,.. 2 3 , 3 , . — 6' 4' Spring , 1, Arching stems with gray -green leaves .- �`' :.Y �' a�,,..4 a, 4. Rubus spectabilis �v Salmonberry 1 2 3 10' 10'0 Late Winter Spring Fast-growing; excellent soil binder ira iM + . r! Salixpurpurea Purple Osier 2 3 r _ 15' 15' Dark green leaves with blue underside; striking purple branches; cut to ground if overgrown sue: l Sambucus nigra 'Black Lace' Black Lace Elderberry 1 2 3 t - 't 8' 8' Late Spring 1 -, Dramatic accent plant; fragrant white flowers �;, � ��' • ' ,, Spirea douglassii i Y f Douglas Spireae. 1 2 , ; 4'-6' 10' Summer Clumping; dark green leaves with velvety white underside 7�"� - 3 . s "- ;' Symphoricarpos yea ' ► w'm albUs ' ^M' Snowberr 2 3 `' . ;> MO 6' 6' Spring 1 a Pink spring -time flowers are followed by white berries that last through the winter; great for erosion control Thuja plicata 'Whipcord' . Dwarf Red Cedar 2 3 " , 4' 4' Unusual and unique planting; cascading branches form a nice mound;; bronze winter color S;'4'u '' Vaccinium ice• parvifolium Red Huckleberry 2 3 di Ail 4'-1 2' 6' prin Spring \14 - -/ Thin branches with cascading habit create a beautfil silhouette Scientific Name Common Name ty3 �.}.:. tu �. C 4''" ✓D � � � �� � _ i' 6 •.... ...-ma.. ..i ,Yz....._ ., ri: �. m `✓• ..: _ ..w. ,a ` s1' ` Acer circinatum Vine Maple 1 �"t?�.:.' £' v. Zone .. j _�.. i. 2 3 .'�� 3 Native A , e's F " _9.•a `. Sun Exposure Height `1L. Y%'r£ c_ Plant Strip Width �. a... .ui S' Fall Color e' - � .. _J.......__.� te) Bloom Time& Color � y r u Characteristics �` n :" -� : � I Partial _ ..x'.....v..3�,....._ Shade y� .i-)r _v Spread n _..�,sv, ...u. 30' i :'ei' ,u.�4Jr— ��„ :i'_ _ ,. 11t t I _ S _ � A Small, nearly symmetrical tree; multiple trunks 30' ,i., _.«. Spring 0 " * Alnus rubra Red Alder 1 2 3 t--",- ; , , f 45' S0' 20' 30' 6' Attractive light gray bark; dark green leaves with rust -colored underside; most common alder of the Pacific Northwest / Betulapapyfera Paper Birch 2 3 ., -„,- f .'� 50'-60' 25' 6' Attractive, creamy -white bark Cornus mas Cornelian Cherry 3 ' s= ;� ;..1 20' 20' 5' Spring Highlyadapatable to environment -" , Corylus cornuta Beaked Hazlenut 2 3 ' '% , : ' di 20' 10' 5' Vase -like shape; needs adequate space to grow; catkins add winter interest f t `.' ' , Crataegus x lavalii Lavalle Hawthorne a jai. 3 .r'�, ,' ; ; 25' 20' S' WO Spring \),% , J ♦_ Dark green leathery leaves; clusters fof red fruits add winter color Fraxinus latifolia �x a Oregon Ash 2 3 ; y' _ . 4 1 60' 35' 6' Tolerant of wet conditions 4''; Lonicera involucrata ,.4a 'r ` t -s,� BlackTwinberry 1 2 3 di i 9' 10' Summer ,� Attractive to hummingbirds .,,;.;.. .._.,.W::µ.f. ', „ �'. •r . � ..... , evr �: , ••i $F,°..'. . ,� - a i+.r.:.. .--. 'Yn,,-'`lL.. -,; . Scientific Name Common Name c ::✓,._..,.`..4._s_'_..� "��....r....:.,^},J.,.l��;.'.:. �..,1.:;6. i,c.±� ,,.:'. .s.".:-. '?,Z.l.._.s-.a_ 'r. • 1 �r.:w, xdr•,a,�in,. 1 Zone ",Y:K'>am%..:,n.,��.._.;.ri: r„x. v 2 3 . ,....h.....�,,.>..,,i. :. rc: 3 Native .� �., .F.»rv�..' ..r. °��.�+„.,,{;.J?,,..c:L. 3,h. ?:�- Sun Exposure Mature Size Plant Strip Width r.Sr+r.. ".. �,�,._,.,...,.'.< '.�. 'v3-. 4 Fall Color '��F .,€;-.xr„.r. v�;xx„'>��� 4 Bloom Time& Color Spring \',- c- - o Characteristics • -a�3.�Ts^, .` ( 3PFY'°•'�'"vk"y':(rH'ramiTr.�x-:..„-�taz',�`.".,'afaP.Yf.`. r":4��.n,�^.a`x-,'t::.� -'a-,:,:•f Requires adequate room to grow; fragrant apple blossoms of white or pink Sun . �,i,.Y.`..:�. . .. r.,.u:Tt4.,fr. , -%' -- ,` '1 : Partial k4� -0,�..?Sr .F -„..., '.....'.�se�.,,...ZaS.' :s:<�r•.s.*,�< Shade 'r§r.'r� v'� S„^# ..,.,,.;.,:.:..:.�...:,�"..�a..'. Fk�'{: Height fi$e�:4.,..�..�,...y.:,,',..'..7 yy�:Y : .✓4' 'r. .�,.,�1h';..r 10'-30' Spread : ......_.,:. Sk{` m.s +i�k.k, �1,."...'.,,T..y.. 10'-30' .�.1 ��'t.,:-,,�r.`?:,.._ i > Malus fusca Pacific Crabapple ", '. ."'�,�x Myrica ealifomiea Pacific Wax Myrtle 1 2 3 1 �f ,. f: _ f r 15' 15' 5' Spring Many upright trunks; branches are densely covered in foliage; purple nutlets attract birds; useful in screening Parrotia persica Persian Parrotia 2 3 "' '� = t 15'-30' 20' S' 00 Early Spring .- Smooth gray bark with white patches; colorful tree ear -round P Y ., ° ` Rhamnus purshiana Cascara 2 3 ' f �� 20' 40' 10' 30' S' 1 Smooth gray bark; picturesque branches; dark green leaves �,��" . , � Pacific Willow 2 3 B f ,� 15'-45' 30' Spring Useful as a screening plant orSalixlucida windbreaker; excellent for stablizing banks t v , p tip: Salixsitchensis . Sitka Willow 1 2 { N. ; .. 25' 15' Spring Multi-stemmed,•gray-brown bark; useful in screening g t t �� Sambucus caerulea Blue Elderberry 2 3 ' �" '; 10'30' 8'20' Spring % JI_ Clusters of summertime blue or black berries follow spring -time flowers Thuja plicata t Western Red Cedar 3 % i t -' 'v..d .r riii, I 50'-100' 25'-60' 12' Many cultivars; slender, drooping branches with dark green leaves; requires adequate space to grow New Tukwila Street Tree List Draft August 2, 2016 AUG 15 2016 Community Development Scientific Name Common Name ill/Seta Abies grandis Grand Fir Abies procera Noble Fir Chamaecyparis pisifera Sawara Cypress Picea sitchensis Sitka Spruce Pinus nigra Black Pine Pseudotsuga menziesii Douglas Fir Thuja plicata Western Red Cedar Tsuga heterophylla Western Hemlock Sun Exposure Mature Size Sun Partial Shade Height Spread ar Bloom Time &. Color 3 3 3 3 3 3 3 80' -100' 90' 20' - 30' 80'-100' 40' - 60' 80'-120' 50'-100' 70'-100' 15'-25' 20'-30' 20'-30' 20'-40' 25' 20'-30' 25'-60' 20'-30' Plant Strip Width 12' 12' 12' 12' 12' 12' 12' 12' Fragrant, glossy deep -green needles; native to British Columbia; requires adequate space to grow Short, stiff blue-green needles; requires adequate space to grow � 1 Many cultivars available; requires adequate space to grow Pyramidal in shape; glossy dark green needles; requires consistent moisture; requires adequate space to grow Pyramidal in shape; dense and stout; stiff dark -green needles; pollution tolerant; requires adequate space to grow Pyramidal in shape; soft deep -green or blue-green needles; fast-growing; requires adequate space to grow Many cultivars; slender, drooping branches with dark green leaves; requires adequate space to grow Narrow with pyramidal crown; dark - green to yellow fern -like leaves; nice for screening, fast-growing; requires adequate space to grow Scientific Name Common Name Acer nigrum 'Green Column' Green Column Sugar Maple Acer saccharum 'Bonfire' Bonfire Sugar Maple Acer saccharum 'Commemoration' Commemoration Sugar Maple Acer saccharum 'Green Mountain' Mountain Sugar Maple Alnus rubra Red Alder Fraxinus latifolia Oregon Ash Fraxinus pennsylvanica Patmore Ash Fraxinus pennsylvanica 'Urbanite' Urbanite Ash 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 Plant Strip Sun Partial Shade Height Spread Width • Sun Exposure Mature Size 65' 50' 50' 45' 45'-50' 60' 30'-50' 30'-50' 25' 40' 35' 35' 20'-30' 35' 30'-50' 30'-50' 6' 6' 6' 6' 6' 6' 6' 6' Bloom Time & Color Characteristics Similar to A. saccharum, but more resitant to heat and drought; Fast growing; stout branches form a dense canopy Fast growing; stout branches form a dense canopy Fast growing; stout branches form a dense canopy; tolerant of heat and drought Attractive light gray bark; dark green leaves with rust -colored underside; most common alder of the Pacific Northwest Tolerant of wet conditions Compact, oval crown; dense; strong resistance to disease and pests Pyramidal in shape; dense Scientific Name Common Name Gingko biloba 'Princeton Sentry' Princeton Sentry Gingko Gingko biloba 'Magyar' Magyar Gingko Liriodendron tulipifera Tulip Tree Metasequoia glyphtostroboides Dawn Redwood Nyssa sylvatica Tupelo Quercus coccinea Scarlet Oak Quercus frainetto Italian Oak Quercus garryana Oregon Oak 2 Native 6' 6' 6' 6' Bloom Time & Color Spring Sun Exposure Mature Size Sun Partial Shade Height Spread 35'-50' 15'-20' Plant Strip Width 50' 25' 6' 60'-80' 40' 8' 90' 25' 30'-50' 15'-25' 60'-80' 40'-60' 100' 70' 40'-90' 30'-60' Characteristics Pollution and heat tolerant; pyramidal in shape; autumn leaves fall to form a beautiful groundcover blanket Pollution and heat tolerant; upright and narrow in shape; autumn leaves fall to form a beautiful groundcover blanket ' Fast-growing; straight trunk with pyramidal crown; thrives in rich, well - drained soil Fast-growing; pyramidal in shape with soft, pale green needles and small cones; thrives in well -drained soil Crooked branches with a reddish bark; produces excellent shade; tolerant of poor draining soils Pyramidal when young, but round when mature; gray -brown bark Fast-growing; dark gray bark; glossy deep green leaves; symmetrical Gray, scaly bark; leathery and glossy green leaves i Scientific Name Zone Common Name 1 2 3 Quercus rubra Red Oak Taxodium distichum Bald Cypress Zelkova serrata 'Greenvase' Green Vase Zelkova Zelkova serrata 'Village Green' Village Green Zelkova Acer freemanii 'Autumn Blaze' Autumn Blaze Maple Acer miyabei 'Morton' State Street Maple Betula albosinensis var. septentrionalis Chinese Red Birch 2 2 2 2 3 3 3 3 3 3 3 Native Sun Exposure Mature Size Plant Strip Sun Partial Shade Height Spread Width 60'-75' 50'-70' 45' 45' 50' 40' 40' 50' 20'-30' 40' 40' 40' 30' 35' 8' 8' 6' 6' 6' 6' 5' Bloom Time & Color Characteristics Fast-growing; round canopy; requires fertile soil and regular moisture Pyramidal in shape; feathery, delicate foliage; resistant to disease and pests Attractive bark; tolerant of drought and wind; good shade tree; vase - shaped Attractive bark; tolerant of drought and wind; good shade tree; vase - shaped Fast-growing; dense, oval crown; excellent autumn colors Fast-growing; attractive autumn color Flaking orange to orange -brown bark Scientific Name Common Name Betula papyfera Paper Birch Carpinus caroliniana American Hornbeam Cornus controversa 'June Snow' Giant Dogwood Cornus florida x nuttallii Eddie's White Wonder Dogwood Crataegus x lavalii LavaIle Hawthorne Fraxinus americana Autumn Applause Ash Gingko biloba 'Autumn Gold' Autumn Gold Gingko Rhamnus purshiana Cascara ii) Color to) d to) Bloom Time & Color Spring Mid - Spring 4-6 Spring 2 2 2 2 2 2 2 Sun Exposure Native 3 Sun Partial Shade Height Y�6ua 4raA"llt�N1�htflluIld�ievNmlGrt(kfkiri!AfituT,dllfi,Y1[Cwu4u�PJufJ'�VAWaP4'�If6&AkNNillEsAV '�4L'" Mature Size 3 3 3 3 3 3 3 alba 50'-60' 25' 40'-60' 30' 25' 80' 35'-50' 20'-40' Spread 25' 25' 40'-60' 20' 20' 50' 15'-20' 10'-30' Plant Strip Width 6' 5' 5' 5' 5' 6' 6' 5' Characteristics Attractive, creamy -white bark Attractive, smooth blue -gray bark; can be single or multi-trunked Fast-growing; picturesque branches; full sun is necessary for best bloom Clusters of tiny flowers in mid -spring Dark green leathery leaves; clusters fof red fruits add winter color Fast-growing; useful as a shade tree; oval=shaped crown Pollution and heat tolerant; pyramidal in shape; autumn leaves fall to form a beautiful groundcover blanket Smooth gray bark; picturesque branches; dark green leaves Scientific Name Common Name Sophora japonica 'Regent' Japanese Pagodatree Sorbus aucuparis 'Mitchred' Cardinal Royal Moutain Ash Sorbus x hybridia Oakleaf Royal Mountain Ash Styrax japonicus Japanese Snowbell Tillia cordata 'Degroot' Degroot Littleleaf Linden Tillia cordata 'Chancole' Chancelor Linden Ulmus parvifolia 'Emer 1' Athena Classic Elm Ulmus parvifolia 'Emer 11' Allee Elm 2 2 2 2 2 2 2 3 3 3 Native Sun Exposure Plant Fall Bloom Strip Color Time & Sun Partial Shade Height Spread Width Color i' Mature Size 45' 40' 20'-40' 20'-30' 30' 30'-50' 30'-50' 35' 70' 15'-25' 20'-30' 30' 15'-30' 15'-30' 50' 60' 6' 5' 5' 5' 5' 6' 5' 5' to) Summer Spring J Spring Late Spring Late Spring Characteristics Fast-growing; dark green leaflets; tolerant of urban conditions; great shade tree Dense oval -to -round crown Blue-green foliage Slender trunk; strong horizontal branches; beautiful flowers warrant it being planted in a highly -visited area Very tolerant of urban conditions; excellent shade tree when given room to grow Very tolerant of urban conditions; excellent shade tree when given room to grow Fast-growing; long, weeping branches; excellent street tree or screening tree Long, weeping branches; excellent street tree or screening tree d 1- Scientific Name Zone Common Name 1 2 3 Acer circinatum Vine Maple Acer triflorum Three -Flower Maple Amelanchier grandiflora Autumn Brilliance Serviceberry Cotinus obovatus American Smoke Tree Magnolia 'Galaxy' Galaxy Magnolia Parrotia persica Persian Parrotia Prunus serrulata 'Amanogawa' Amanogawa Flowering Cherry Prunus yedoensis 'Akebono' Akebono Flowering Cherry Native Fall Culur to kid 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 Sun Exposure Mature Size Plant Strip Sun Partial Shade Height Spread Width 30' 30' 5' 25' 20' 5' 20' 15' 4' 25' 25' 5' 15'-30' 20' 5' 20' 8' 6' 25' 25' 6' Bloom Time & Color Spring Early Spring Spring Spring Early Spring Early Spring 7 j Characteristics Small, nearly symmetrical tree; multiple trunks Multi -season interest; beautiful autumn color; tan bark , Strong stems; blue-green foliage; drooping clusters of white flowers Unusual and colorful; excellent screening tree;; blue-green foliage Fast-growing; conical shape; showy flowers Smooth gray bark with white patches; colorful tree year-round Vase -like shape Most common cherry tree in the Pacific Northwest; disease resistant Memorandum 700 Washington Street Suite 401 Vancouver, WA 98660 Phone (360) 737-9613 Fax (360) 737-9651 To: Greg Villanueva, City of Tukwila From: Trista Kobluskie Prepared by: Trista Kobluskie; Finis Ray Copies: File Date: August 10, 2016 Subject: Additional Research on Recommendations to Limit Development Area Coverage and Offer Height Bonus Incentives to Restore Native Vegetation Project No.: 32634 On May 6, 2016 Otak submitted the Low Impact Development Code Update Findings and Recommendations Report to the city. The report included 40 recommendations for incorporating the principles of low impact development (LID). The city asked for additional research and justification on a few of the recommendations. Additional research is described below. Recommendations to Limit Development Area Coverage Recommendations Our Low Impact Development Code Update Findings and Recommendations Report contained three recommendations related to limiting development area coverage: — 28. Add language to 18.50.085 TMC to limit development area coverage on single-family lots to 75%. — 29. Amend the definition of developed area in 18.06.215 to include pervious hard surfaces. — 32. Develop a 90% lot coverage limitation for Tukwila's non-residential and mixed -use districts, excluding Tukwila Urban Center. LID Purpose Retaining vegetation and managing stormwater in small distributed facilities are primary tenets of LID. Regulations which ensure that at least some portion of a building or development site is not K:\project\32600\32634\ProjectDocs\Reports\_4 Draft Codes and Drawings\Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 2 August 10, 2016 ultimately covered with buildings, parking, sport courts, and other hard surfaces leave some room for trees, native vegetation retention, vegetated LID facilities, and landscaping. Background Tukwila limits development area coverage in Planned Residential Developments (PRD) in 18.45 TMC, and for medium and high density residential zones in 18.50 TMC. In a PRD, the limitation is 50% coverage on sites with sensitive areas. The limitation for MDR and HDR is 50%, with an allowed increase up to 75% for townhome development when LID techniques are used. Commercial, industrial and mixed -use lots are not limited in development coverage directly; however minimum landscaping standards ensure that some portions of these lots are not covered in developed surfaces (18.52 TMC). However, Tukwila has no mechanism for limiting development area coverage on single-family lots. In conversations with the city, city staff noted that under current regulations, some single-family building sites have covered almost the entire lot with buildings and paved surfaces. Analysis Other cities limit coverage of single-family lots. Olympia, Renton and Kent limit coverage of single- family lots through regulation of maximum impervious surface area. City Code Reference District Limitation Olympia 18.04 Residential Districts R4-8 Maximum impervious surface coverage limited to between 55% to 50% Renton 4-2-110A R-1 to R- 14 Maximum impervious surface area limited to 25% in R-1 to 80% in R-14 Kent 15.04.170 Residential Maximum impervious surface limited to 50% to 75% Maximum impervious surface coverage is similar to Tukwila's current definition of development area coverage. For a visualization of the proposed 75% limitation on single-family sites, see Figure 1 on page 4. At 18.06.215 TMC, Development Area is defined as: ""Development area" means the impervious surface area less the following surfaces: the footprint of an exclusive recreational facility; a proportion of a recreational facility footprint when contained within a general use building as follows: the portion of the footprint area occupied by a recreational facility divided by the number of floors in that portion of the building; vehicle circulation aisles between separate parking areas; K:\project\32600\32634\ProjectDocs\Reports\ 4 Draft Codes and Drawings \Title 18\Recommendations Additional Research nlcmo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 3 August 10, 2016 sidewalks; paths; and other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment." According to the Tukwila Department of Community Development, the intent in exempting recreational facilities and vehicle circulation aisles from the definition is to support the public goals of encouraging recreational amenities and conveniently -located parking in medium and high density residential areas. At 18.02.180, Definitions, Olympia Municipal Code states: "Coverage, Impervious/Development. The area which is occupied or covered by all impervious surfaces including the total horizontal surface of all buildings, except two feet of eaves. (See also Net Site Area and Impervious Surface.)" Definitions are similar in other cities we compared. From an LID perspective, we see a flaw in regulating only impervious surface coverage. A primary tenet of LID is to preserve vegetation and soils. Permeable pavements, while they are an LID technique, still displace vegetation and topsoils. Limiting the coverage of lots by developed hard surfaces of all kinds, including permeable pavements, leaves room for vegetation and soils on lots. On the other hand, including permeable pavements in the definition of development area could be perceived as discouraging the use of permeable pavement. We find that Tukwila does not directly limit development area coverage for commercial, industrial and mixed -use lots; however minimum landscaping standards ensure that some portions of these sites are not covered in developed surfaces (18.52 TMC). As a result of this finding, we rescind our recommendation #32 to develop a coverage limitation for non-residential and mixed -use districts. Options for Inclusion of Permeable Pavements To balance the considerations of vegetation and soils retention and restoration with the consideration that the city may want to avoid discouraging the use of permeable pavements, we consider two options for the question of whether to add permeable pavement to the definition of development area. Option I Focus the regulation of development area coverage on vegetation and soil retention by adding permeable pavement surfaces to the definition of development area. Option 2 Emphasize the retention of vegetation and soils while attempting not to discourage the use of permeable pavements by adding permeable pavement surfaces to the definition of development area on a prorated basis. Using this option, 75% of any area of permeable pavement would count toward the calculation of development area coverage. K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings \Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 4 August 10, 2016 Visualization Figure 1 shows two views of a 6,500 sf residential lot limited to 75% development area coverage. K:\project\32600\32634\ProjectDocs\Reports\ 4 Draft Codes and Draw ings\Title 18\Recommendations Additional Research Mcmo.docx f \ Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 5 August 10, 2016 Revised Recommendation Our revised set of recommendations on this topic addresses two elements. 1) We continue to recommend that Tukwila begin regulating development coverage in residential districts. This limitation is currently lacking, and residential parcels can completely cover a lot with buildings, driveways and the like. 2) To take the concept even further in support of LID principles, we recommend that Tukwila include a prorated portion of permeable pavement surfaces in the definition of development area in order to ensure that lots and sites have room for trees, native vegetation and landscaping. Recommendation 28 — no change. Add language to 18.50.085 TMC to limit development area coverage on single-family lots to 75%. Recommendation 29 — small change. Amend the definition of development area in 18.06.215 to include 75% of the area of any permeable pavements proposed. Amend the definition of development area to apply the exclusions relating to recreational facilities and vehicle circulation aisles only to MDR, HDR and townhomes. — Recommendation 32 — deleted. Recommendation to Preserve/Restore Native Vegetation by Offering a Height Bonus in the Tukwila Urban Center Recommendation Our Low Impact Development Code Update Findings and Recommendations Report contained a recommendation to help preserve or restore areas of native vegetation in the Tukwila Urban Center (TUC): — 4. Add structured parking to the list of items in 18.28.070 Tukwila Urban Center allowed for height bonus to 70 or 115 feet. Background Tukwila's urban center is regulated in 18.28 TMC, which contains all types of design standards for the district. The TUC is intended to be highly urban and accommodates buildings of up to 115 feet in height with a height bonus established in 18.28.070. The current height bonus incentivizes public frontage improvements, LEED certification, multi -family housing and affordable housing. LID Purpose Allowing development to build vertically naturally relieves some pressure on developing horizontally and could help to reverse the incentive to displace vegetation and soils with developed surfaces. Providing an incentive to preserve or restore additional areas of vegetation and soils in exchange for a height bonus could make preservation more attractive. K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings \ Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 6 August 10, 2016 Analysis The original recommendation is vague in describing the LID benefit of the height bonus. The real focus of the incentive is the restoration of pervious landscaped or natural areas in the TUC. Restoration of pervious landscaped areas on the site could be achieved by providing structured parking or through other means. However, the City does think structured parking would be a benefit in the TUC and contribute to the intent of a highly urban landscape. Clarified Recommendation and Proposed Draft We provided our proposed amendments to 18.28.070 TMC to the City on 8/05/2016. In order to guarantee an LID benefit in exchange for the height bonus, we clarified the proposed language so that restoration of native vegetated surfaces is a requirement of using the height bonus. Structured parking remains the method of reducing site coverage and provides a basis for calculating how much pervious landscaped surface is required to be restored on the site. To illustrate the LID benefit and other potential effects, we compared the hypothetical construction of a new large shopping center in the TOD using current standards and surface parking to the same development using the proposed height incentive. In both scenarios, the new shopping center has 500,000 square feet of usable floor area. We found that the hypothetical development using the proposed incentive could restore and preserve in perpetuity 280,000 square feet of native vegetation area and also might need 31% less total land area than the baseline scenario. The table below illustrates the comparison. K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings\Title 18\Recommendations Additional Research Mcmo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Comparison of Shopping Center in the TOD with 500,000 SF Usable Floor Area Page 7 August 10, 2016 Baseline (Surface Parking) Comparison (Structured Parking Height Incentive)1 Shopping Center Building UFA (SF) 500,000 500,000 Parking Needs Required Parking Stalls 2,500 2,500 Approx. Area for Parking2 (SF) 875,000 875,000 Structured Parking Incentive Min. Number of Structured Stalls3 0 2,000 Number of Surface Stalls Remaining 2,500 500 Approx. Area for Structured Parking2 (SF) 0 700,000 Approx. Area for Surface Parking2 (SF) 875,000 175,000 Land Area Needs Total Area for Building UFA and Surface Parking (SF) 1,375,000 675,000 Min. Area for Retained Vegetation4 (SF) 0 280,000 Total Area for Building UFA, Surface Parking, and Veg Protection (SF) 1,375,000 955,000 Savings in Land Area Needed Compared to Surface Parkings (%) 0% 31% 1. Assumes structured parking is located under shopping center building 2. Assumes 350 SF/stall, which includes aisles, etc. 3. Proposed incentive would require 80% of stalls to be structured 4. Proposed incentive requires 40% of area that would have been dedicated to surface parking to be native vegetation 5. Does not consider other needs for land on site, e.g. pedestrian open space requirement, stormwater management facilities, frontage. Recommendation to Preserve/Restore Native Vegetation by Offering a Height Bonus in Non -Residential and Mixed -Use Districts Recommendation Our Low Impact Development Code Update Findings and Recommendations Report contained a recommendation to help preserve or restore areas of native vegetation in non-residential areas that are outside of the TUC: — 33. Develop a two -tiered height bonus in the non-residential and mixed -use districts. Allow 1 story additional for structured parking that contains at least 50% of the required spaces. Allow 1 story additional for reduction in lot coverage to maintain/restore at least 15% of the site in native vegetation (in addition to any required landscaping and setbacks). Note: the proposed incentive is separate from the report's recommendation to develop a similar incentive in the TUC, discussed above. K:\project\32600\32634\ProjectDocs\Reports\_4 Draft Codes and Draw ings\Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Page 8 August 10, 2016 LID Purpose Allowing development to build vertically naturally relieves some pressure on developing horizontally and could help to reverse the incentive to displace vegetation and soils with developed surfaces. Providing an incentive to preserve or restore additional areas of vegetation and soils in exchange for a height bonus could make preservation more attractive. Background Tukwila regulates building height in each zoning district. The PRD provisions already allow applicants to increase building heights in order to maintain significant vegetation and enhance views, as long as a commensurate decrease in impervious surface is proposed. Other developments are not afforded the opportunity to increase building heights in exchange for limiting impervious surfaces or preserving/restoring vegetation and soils. City Concerns The City expressed concern about the potential effects of a building height bonus on adjacent low density residential districts. Visualizations The following figures illustrate a multi -story mixed -use building adjacent to existing single family residential lots. The base scenario illustrates a three-story building with surface parking. The recommended scenario illustrates a five -story building with structured parking and utilizing the proposed height bonus. K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings\Title ]8\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Figure 2 shows a street perspective of mixed -use buildings adjacent to residential.- 3-Story (top) and 5-Story (bottom). Page 9 August 10, 2016 K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings\Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Figure 3 shows a shade study simulated at 9:30am of mixed -use building adjacent to residential: 3-Story (left) and 5-Story (right). Page 10 K:\project\32600\32634\ProjectDocs\Reports\_4 Draft Codes and Drawings\Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Additional Research - Restore Native Vegetation Figure 4 shows the minimum pervious landscaping requirement of mixed -use building: No height incentive (left), height incentive (right). PE lIOUS SURFACE 15%PRESERVED NdYIVE,VEGETATIO14° IMPERVIOUS PARKING LOT.. (50 SPACES PER MUNICIPAL CODE) '-- 1 1 -IMPERVIOUS'� IS RUCTURED PARKING 95i SPAC ES. PER. MUNICIPAL CODE} -STORY' BUILDING Page 11 • K:\project\32600\32634\ProjectDocs\Reports\_4 Draft Codes and Drawings \Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Page 12 -Additional Research -Restore Native Vegetation Analysis The original two -tiered recommendation does not function to require an increase in pervious landscaped surfaces in support of LID principles when developers choose the first tier of the bonus. Only the second tier of the bonus requires additional pervious landscaping in support of LID principles. The original recommendation emphasizes the provision of structured parking as an innate way to reduce the outward pressure of development on the site. The real focus of the incentive, however, is the preservation or restoration of pervious landscaped or natural areas that naturally manage precipitation. It is not necessary to emphasize structured parking. The shade study (see Figure 3) reveals that an adjacent single-family home may be cast into greater shade by a taller building. However, in a review of Tukwila's zoning, we found few examples where a low density residential zone directly abuts a mixed use or commercial zone. Options In light of potential effects on adjacent properties and an LID -benefit that is not guaranteed, the recommendation could be revised to address these concerns. We consider three options. Option I Follow the original recommendation. Option 2 Modify the recommendation to ensure an LID benefit. Develop a two -tiered height bonus in the non-residential and mixed -use districts. Allow one story for a site that maintains or restores at least 10% of the site area in native vegetation. Allow one additional story for a site that maintains or restores at least 15% of the site in native vegetation. Retained or restored native vegetation areas must meet the standards of the King County Surface Water Design Manual and must be in addition to any required landscaping and setbacks. Applicants may use structured parking to help reduce site coverage. Option 3 Modify the recommendation to to ensure and LID benefit and reduce potential impacts on neighboring low density residential districts and to ensure an LID benefit. Develop a height bonus in the non-residential and mixed -use districts. Allow one story for a site that maintains or restores at least 10% of the site area in native vegetation. Retained or restored native vegetation areas must meet the standards of the King County Surface Water Design Manual and K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codes and Drawings\Title 18\Recommendations Additional Research Memo.docx Greg Villanueva, City of Tukwila Page 13 Additional Research - Restore Native Vegetation must be in addition to any required landscaping and setbacks. Applicants may use structured parking to help reduce site coverage. Recommendation We recommend Option 2. K:\project\32600\32634\ProjectDocs\Reports\4 Draft Codcs and Drawings \Title 18\Recommendations Additional Research Mcmo.docx 10% amount of site allowable impervious area - amount of lot Structure other than pervious total impervious Permit # Lot size coverage coverage structures improvements area Lot coverage D15-0021 6,780 678 2276 710 2,986 0.44 D15-0157 98,446 9,845 1694 2345 4,039 0.04 D15-0161 9,459 946 1274 1308 2,582 0.27 D15-0163 9,400 940 2451 1279 3,730 0.40 D15-0285 15,387 1,539 3907 1455 2643 5,362 0.35 D15-0302 6,635 664 1870 1765 3,635 0.55 D13-179 4,218 422 1315 338 192 1653 0.39 Lot Size Development Area standard Maximum developable area Lot Size % increase above 6500 75%-% inc. Maximum development area 6000 0.75 4,500 6000 6500 0.75 4,875 6500 7000 0.75 5,250 7000 500 0.63 74.38 4,688 7500 0.75 5,625 7500 1000 1.25 73.75 5,531 8000 0.75 6,000 'C 8000 1500 1.88 73.13 5,850 8500 0.75 6,375 h 6 8500 2000 2.50 72.50 6,163 9000 0.75 6,750 C is ''t o 9000 2500 3.13 71.88 6,469 9500 0.75 7,125 `lo 9500 3000 3.75 71.25 6,769 10000 0.75 7,500 \ 10000 3500 4.38 70.63 7,063 10500 0.75 7,875 I 10500 4000 5.00 70.00 7,350 11000 0.75 8,250 1 11000 4500 5.63 69.38 7,631 11500 0.75 8,625 11500 5000 6.25 68.75 7,906 12000 0.75 9,000 1 12000 5500 6.88 68.13 8,175 12500 0.75 9,375 / 12500 6000 7.50 67.50 8,438 13000 0.75 9,750 5 LtQ 13000 6500 8.13 66.88 8,694 13500 0.75 10,125 - co 0 13500 7000 8.75 66.25 8,944 .2 G 0001 Low Impact Development Code Update Findings and Recommendations Report Submitted to: City of Tukwila 6200 Southcenter Boulevard Tukwila, WA 98188 .\ �. `;'-- L Prepared by: Otak, Inc. 11241 Willows Road NE, Suite 200 Redmond, WA 98052 Otak Project No. 32634 May 6, 2016 HanmiGlobal Partner Acknowledgements Low Impact Development Code Update LID Code Update Findings Report Submitted to: City of Tukwila Greg Villanueva Prepared by: Otak, Inc. Trista Kobluskie Stormwater Planner Approved by: Russell Gaston, PE Principal Table of Contents Page Section I —Introduction Purpose 1 Low Impact Development Summary 1 Development Context 2 General Support for LID 3 How to Use this Document 4 Abbreviations 4 Section 2—Parking 6 Findings 6 Minimum/Maximum Parking Ratios 6 Use of Permeable Paving for Parking 7 Parking Stall Dimensions 7 Off -Street Parking Regulations 8 Recommendations 8 Section 3—Landscaping and Native Vegetation 9 Findings 9 Tree Preservation 9 Screening 11 Landscaping for Street Frontages 12 Landscaping in Parking Lots 14 Landscaping Site Preparation 15 Trees and Bioretention 15 Recommendations 15 Section 4 - Design Guidelines and Standards I8 Findings 18 Continuous Curb Requirements 18 Curb Radii 18 Recommendations 18 Section 5-Hard and Impervious Surfaces 21 Findings 21 Maximum Impervious Surface Allowances 21 Shared Driveways 22 Minimum Driveway Width 22 Permeable Paving for Driveways 22 Two -Track Driveway Design 22 Recommendations 23 Section 6-Clearing and Grading and Healthy Soils 24 Findings 24 Recommendations 24 Low Impact Development Code Update i Findings and Recommendations Report otak Table of Contents Continued Section 7-Bulk and Dimensional Considerations 25 Findings 25 Building Setbacks 25 Height Limitations 25 Clustering 26 Recommendations 26 Section 8-Streets and Roads 27 Findings 27 Pavement Width 27 Right -of -Way 27 Use of Permeable Paving for Streets and Roads 28 Placement of Utilities Under Paved Section 29 Required Turnarounds and Radii 29 Sidewalk Width 29 Sidewalk Slope . 30 Permeable Pavement for Sidewalks 30 Recommendations 30 Section 9-Site Planning & Assessment Findings 32 Findings 32 Recommendations 32 Section I 0-Subdivision and Planned Unit Development 33 Findings 33 Recommendations 33 Section I I -Stormwater Management and Maintenance 34 Findings 34 Maintenance Provisions 34 Inspection Access 34 Enforcement 34 Recommendations 35 Section 12-Critical Areas & Shoreline Management 36 Findings 36 Recommendations 36 Section I3—Summary 37 Section 14-References 44 Low Impact Development Code Update ii Findings and Recommendations Report otak Table of Contents Continued Figures Figure I —Artistic stormwater conveyance and vegetated LID facilities 12 Figure 2 — Bioretention integrated into urban landscape strip 13 Figure 3 — Bioretention swale as parking lot landscaping 15 Figure 4 — City of Redmond side curb cut to bioretention detail 19 Figure 5 — Inlet/outlet for curb extension for Portland OR 20 Figure 6 — Curb extension in the parking lane containing bioretention 28 Tables Table I— Comprehensive Plan Policies Supportive of LID 3 Table 2— Selected Parking Ratios 6 Table 3 — Selected Setbacks 25 Table 4 — Sidewalk Widths 29 Table 5 — Recommendation Categories 38 Low Impact Development Code Update Findings and Recommendations Report ui otak r\ Section I —Introduction The City of Tukwila is covered under the National Pollutant Discharge Elimination Systems (NPDES) Western Washington Phase II Municipal Stormwater Permit (Permit). Permit condition S5.C.4.f requires permittees to incorporate and require Low Impact Development (LID) principles and Best Management Practices (BMP) in local development - related codes, rules, and standards by December 31, 2016. The Permit states: The intent of the revisions shall be to make LID the preferred and commonly -used approach to site development. The revisions shall be designed to minimize impervious surfaces, native vegetation loss, and stormwater runoff in all types of development situations. The Permit requires permittees to engage in a process of review and revision of local codes similar to the process outlined in Integrating LID into Local Codes: A Guidebook for Local Governments (Puget Sound Partnership, 2012). For the remainder of this report, we refer to this document as the Guidebook. To facilitate this process, Otak reviewed Tukwila's development codes and then hosted discussions with City staff from February to April, 2016. Staff from Community Development, Public Works, and the Fire Department attended discussions and were trained on LID concepts. In consideration of the draft gap analysis and the ideas and feedback generated by staff, Otak proposes numerous changes to Tukwila's codes and standards. Proposed changes have been developed to the conceptual level and are presented here for review by the City's leadership. Purpose The purpose of this report is to provide City decision -makers with our findings, recommendations, and concepts for code updates related to LID and to obtain agreement for pursuing updates. Low Impact Development Summary LID is defined in numerous references, and LID best management practices have been allowed in various stormwater engineering manuals in Washington since at least 2005. Tukwila's Permit states in Appendix 1: Low -impact development (LID) is a stormwater and land use management strategy that strives to mimic pre -disturbance hydrologic processes of infiltration, filtration, storage, evaporation, and transpiration Low Impact Development Code Update 1 Findings and Recommendations Report otak / Section I —Introduction Continued by emphasizing conservation, use of on -site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. Several references that also define LID are listed in Section 14 of this report. LID techniques encourage the reduction of landscape cover such as roads, buildings, and parking lots, encourage restoration and retention of soils and native vegetation that effectively manage the rain that falls on them, and prioritize stormwater management practices that are small, vegetated, distributed throughout the landscape, and emphasize infiltration or dispersion. Common LID stormwater management practices include bioretention (also commonly known as rain gardens), permeable pavement, and downspout infiltration drywells. As a land use strategy, LID principles are applicable during land development and redevelopment and may be contradicted by a City's land use standards that require impervious cover and allow for removal of native vegetation, often in excess of absolute need. Thus, the City's Permit and Guidebook require a review of Tukwila's development codes and standards, including Zoning, Subdivision, and other enforceable documents that control land use. Development Context Tukwila is a small city of approximately 20,000 and 9.65 square miles in heavily -developed King County'. The City's daytime population increases to 150,0002. Tukwila's primary development pressures are expected to be infill and redevelopment'. There are few areas of the City with intact native forests and undisturbed soils'. Thus, the primary foci for the LID model of site development within the city will need to be 1) encouraging retrofit of existing impervious surfaces to permeable materials or reclaimed and restored landscaped areas, 2) managing stormwater close to its source, and 3) ensuring that there are no codified or procedural barriers to the use of LID techniques required in the King County Surface Water Design Manual 2016 (2016 KCSWDM). ' City of Tukwila web page: http:!!www.rukwilawa.guvi departments/economic-development data -and - demographics; (retrieved May 6, 2016) 2 City of Tukwila web page: htti : iNVVy NV. rukwilawa.gov dcparrimts; police/ administrarion(retrieved May 6, 2016) 3 LID Team Meeting, February 23, 2016. Ibid. Low Impact Development Code Update Findings and Recommendations Report 2 otak l � Section I— Introduction Continued General Support for LID Tukwila's policies as expressed through its Comprehensive Plan are frequently supportive of LID principles. Proposed updates to Tukwila's development and stormwater codes to ensure that LID becomes the preferred and commonly used approach to site development would implement or otherwise support many of these policies. Table I— Comprehensive Plan Policies Supportive of LID Element Goal Policy Summary Community Image and Identity 1.8.1 Maintain and periodically revise parking standards to ensure typical daily demand is met and to encourage shared parking. Natural Environment 4.1.5 Develop and implement programs encouraging residents to protect natural environment, including using LID techniques Natural Environment 4.5.3 Develop best management practices for surface water drainage and street maintenance to avoid disturbing native vegetation Natural Environment 4.8.3 Perform inspection programs to ensure proper maintenance of surface water management systems. Natural Environment 4.13.1 Promote tree retention throughout the City. Natural Environment 4.13.11 Evaluate current parking lot landscape requirements to identify opportunities to increase tree canopy. Natural Environment 4.13 Increase overall citywide canopy to 29% by 2034. Parks, Recreation and Open Space 6.2.1 Recognize that the City's open space network will be made up of public and private lands that provide or have the potential to provide stormwater detention, water quality enhancement, and urban forest preservation. Shorelines 5.3.1 Implement shoreline guidelines to encourage river views, multiple uses, and Low Impact Development Code Update Findings and Recommendations Report 3 otak Section I —Introduction Continued Element Goal Policy Summary encourage native vegetation. Southcenter 10.2.1 Promote use of indigenous plants, water - saving plants, and plants with wildlife habitat value. Utilities 12.1.25 Require on -site detention for both development and redevelopment projects, unless another viable option exists. Utilities 12.1.29 Encourage tree retention and plantings for their benefits to surface water quality and quantity. Transportation 13.1.5 Incorporate features such as natural drainage and native plantings into the design of transportation facilities. Transportation 13.2.2 Prioritize residential through streets, minimizing cul-de-sacs. Transportation 13.2 Street Network Implementation Strategy: Develop methods to incentive shared driveways. In addition, Title 14 — Waters & Sewers allows exceptions to Public Works standards and land use standards for the purpose of implementing LID principles with approval from the applicable department head. Under proposed updates, many codes and standards will already incorporate the principles of impervious surface reduction, vegetation and soils retention that are referenced in this title. How to Use this Document This document is organized by 12 topics that are cited in the Guidebook, and then further organized by sub -topic. Within each topic, we have provided a discussion of Tukwila's current regulations and recommendations for updates at the conceptual level. A full list of recommendations and justifications is given in Section 13-Summary. Abbreviations ADT Average daily traffic BMP Best Management Practices Low Impact Development Code Update Findings and Recommendations Report 4 otak Section I— Introduction Continued HDR High -density residential zone IBC International Building Code IDCS Infrastructure Design and Construction Standards KCC King County Code KCSWDM King County Surface Water Design Manual MDR Medium -density residential zone PRD Planned Residential Development RCC Residential Commercial Center TMC Tukwila Municipal Code TUC Tukwila Urban Center zone TVS Tukwila Valley South zone ROW Right-of-way Low Impact Development Code Update 5 Findings and Recommendations Report otak Section 2—Parking Surface parking contributes significantly to impervious cover of the landscape. City regulations can encourage parking by establishing minimum parking ratios for uses or zones, setting minimum dimensions for stalls and aisles, and disallowing shared parking. Parking requirements that supply parking in excess of need would be contrary to LID principles. Findings Tukwila recently re -wrote its parking code for other purposes'. Our recommendations factor this in. Minimum/Maximum Parking Ratios Tukwila describes parking ratio requirements in Title 18 — Zoning. Minimum required parking is listed by use within each zone. Parking requirements between zones appear consistent. We compared parking ratios for two benchmark uses to ratios recommended in the James River Association's publica ' n, Examples of Code and Ordinance Language for Better Site Design (Better Site Design). Table 2— Selected Parking Ratios Tukwila Title 18 Better Site Design Recommendations Category Minimum Parking Category Minimum Parking Office 3.0 (1:,er 1,000 usable floor area Professional Office 3 or less per 1,000 gross floor area rietail .2,51 ft-.. '¢. 0 J'per 1,000 sf usable floor area Shopping Center 4.5 or less per 1,000 sf GFA Compact Spaces Maximum number compact spaces is 30% Compact Spaces At least 30% at larger commercial/shopping centers Since 100% demand is rarely needed, providing parking for the 100% demand situation in commercial development may be the activity in Tukwila that adds the most "unnecessary" impervious cover'. However, Tukwila's current ratios for professional office and shopping center are similar to the ratios recommended by Better Site Design. Thus, we do not recommend a change at this time. Tukwila may want to continue to assess options for satisfying parking demand with less impervious cover. Note: the Office requirement may slightly exceed the Better Site Design recommendation; it is difficult to compare because Tukwila uses usable floor area while the recommendation 5 Ibid. 6 Bradshaw, M. Personal Communication. April 6, 2016. Low Impact Development Code Update 6 Findings and Recommendations Report otak Section 2—Parking Continued uses gross floor area to base calculations. Usable floor area excludes common corridors, restrooms, elevator shafts, stairwells, mechanical rooms, attics, and exterior covered loading docks (TMC 18.06.863). Better Site Design recommends at least 30% of spaces be required to be compact sized. Staff expressed that the current allowance of 30% is adequate because most developers use as many compact spaces as are allowed'. Comprehensive Plan policies 1.8.1 and 8.5.1 recognize that parking should not be supplied in excess of demand. Use of Permeable Paving for Parking This topic is not discussed in Tukwila's codes and standards. With adoption of the 2016 KCSWDM, permeable paving will be an option to meet Core Requirement #9. TMC 18.56 Off -Street Parking and Loading could be updated with a preference for use of permeable pavements. Staff supports the idea of requiring any stalls provided in excess of the minimum to use permeable pavements where feasible. We found that TMC 8.25 requires vehicle storage and parking on single family residential property to be on an "approved durable uniform surface." The definition of this surface would include permeable pavements and does not need to be updated. Parking Stall Dimensions Larger -than -necessary parking stall dimensions increase impervious cover. Stall and aisle dimensions are given in TMC 18.56 Off -Street Parking and Loading, Figure 18-6. For angle spaces, Tukwila gives three options for dimensions for each angle of regular size parking stall. The largest set of dimensions for each angle exceeds the dimensions recommended for Better Site Design. Supportive language in TMC 18.56 includes allowing a 2-foot landscaping overhang to count toward stall length and allowing tandem parking spaces in the medium -density residential (MDR) and high -density residential (HDR) zones. 7 LID Team Meeting, February 23, 2016. Low Impact Development Code Update 7 Findings and Recommendations Report otak Section 2—Parking Continued Off -Street Parking Regulations Impervious surface cover can be reduced by providing parking in structures rather than in lots and allowing shared parking. Structured parking could be incentivized in the Tukwila Urban Center (TUC) zone through a height incentive. However, structured parking is not necessarily feasible underground given high groundwater throughout much of the commercial district, so a provision like this may be infrequently used. Complementary shared parking is already allowed in all zones in Title 18 but is not promoted. Recommendations 1. Add a new section in TMC 18.56 Off -Street Parking and Loading to require any parking spaces provided above the minimum in a parking lot to use pervious materials, if feasible in accordance with the stormwater manual. 2. Add a preference within 18.56 Off -Street Parking and Loading for use of permeable pavements for off-street parking, if feasible in accordance with the stormwater manual. 3. Delete the largest set of parking stall dimensions for each angle from Figure 18-6. 4. Add structured parking to the list of items in 18.28.070 Tukwila Urban Center allowed for height bonus to 70 feet or 115 feet. \ct Low Impact Development Code Update 8 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Using vegetation and retained or enhanced soils to help slow, infiltrate, transpire, and treat precipitation and runoff is a principle of LID. Retention of native vegetation and soils is given as one of three performance measures for the LID code update in the City's Permit. The City's existing landscaping, screening, and tree preservation codes can be strengthened to support this important goal more fully. Municipal landscaping and native vegetation codes often compete with other needs on the landscape. With appropriate flexibility in municipal codes, some LID BMPs can be integrated into landscaping and screening areas, allowing stormwater management to be integrated throughout a site, and reducing costs and competing needs for space. The Guidebook notes that: Native vegetation and soils are also the most cost-effective and efficient tools for managing stormwater quantity and quality. Findings Tree Preservation Tukwila promotes preservation of trees on development sites in the Comprehensive Plan, Tide 17 — Subdivisions, Title 18 — Zoning, and the Infrastructure Design and Construction Standards (IDCS). In particular the Comprehensive Plan describes goal 4.13 to create a comprehensive list of measures to increase overall citywide canopy to 29°io by 2034. The City is already working on an update to its tree regulations in TMC 18.54 — Tree Regulations and intends to incorporate recommendations developed through the LID code update process'. Title 17's general standards require reasonable efforts to retain trees and vegetation during land division. This language could be strengthened by calling out and defining native vegetation. The 2016 KCSWDM defines a native vegetated surface as: Native vegetated surface means a surface in which the soil conditions, ground cover, and species of vegetation are like those of the original native condition for the site. More specifically, this means (1) the soil is either undisturbed or has been treated according to the "native vegetated landscape" specifications in Appendix C, Section C.2.1.8; (2) the ground is either naturally covered with vegetation litter or has been top -dressed between plants with 4 inches of mulch consistent with the native vegetated landscape specifications in Appendix C; and (3) the vegetation is either (a) comprised predominantly of plant species, other 8 LID Shorelines and Tree Code Review Meeting, March 15, 2016. Low Impact Development Code Update 9 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued than noxious weeds, that are indigenous to the coastal region of the Pacific Northwest and that reasonably could have been expected to occur naturally on the site or (b) comprised of plant species specified for a native vegetated landscape in Appendix C. Examples of these plant species include trees such as Douglas fir, western hemlock, western red cedar, alder, bigleaf maple and vine maple; shrubs such as willow, elderberry, salmonberry and salal; and herbaceous plants such as sword fern, foam flower, and fireweed. Tree preservation is discussed at length in 18.44 — Shorelines. Short plats and small lots often are exempt from the tree preservation requirements. With future adoption of the 2016 KCSWDM, small lot and single large -lot developments will be allowed a native growth retention credit for retained trees and native vegetation toward meeting Core Requirement #9, so it may not be necessary to reconsider these exemptions. TMC 18.54 exempts from regulation clearing vegetation on any site unless the site is located in a sensitive area or buffer or the Shoreline zone (18.54.050). This exemption is not supportive of LID principles to retain native vegetation in the development process. TMC 18.54 gives priority to retaining stands of trees over retention of individual trees. The LID Technical Guidance Manual is more specific and prioritizes native vegetation and soil protection in the order shown below: • Large tracts of riparian areas that connect and create contiguous riparian protection areas. • Large tracts of critical and wildlife habitat areas that connect and create contiguous protection areas. • Tracts that create common open space areas among and/or within developed sites. • Protection areas on individual lots that connect to areas on adjacent lots or common protection areas. • Protection areas on individual lots. Tree protection measures are given in TMC 18.54. These are not specific. The LID Technical Guidance Manual proposes specific tree protection measures for use during construction in Section 4.1.1. Doing more to ensure health of retained trees would be more supportive of LID principles. Tree replacement specifications are also given. No tree list is cited. Replaced trees should ideally be native trees to be in full support of LID principles. 9 Ibid. Lom Impact Development Code Update 10 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued In 4.0.4 Frontage Improvements in the IDCS, existing vegetation should be retained or replanted in the frontage when disturbed during development. This is supportive, although replaced vegetation should ideally be native vegetation suited for use in the ROW. Screening Screening codes provide an opportunity to integrate vegetated LID BMPs, making selection of LID BMPs more desirable compared to traditional stormwater management BMPs. Screening is discussed in Title 17 — Subdivisions and Tide 18 — Zoning. Use of LID could be promoted by allowing bioretention facilities to serve as screening, thus reducing space needed in a development for stormwater management. Required screening types and depths are summarized for all districts for front yard, side yard, and rear yard in a table shown in 18.52 — Landscape, Recreation, Recycling/Solid Waste Space Requirement. Requirements are established separately for each zone within the title. Good candidates for making clear that bioretention can serve as screening in some situations are listed below. • Bioretention could serve as up to 20% of the front yard landscaping of MDR and HDR, which already allow pedestrian and transit facilities under a Type 2 decision. • Bioretention could serve as part of required landscaping in RCC, TVS, and TSO districts. • Bioretention could serve as Types I and II landscape perimeters in 18.52.030. Low Impact Development Code Update 11 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued Figure I— Artistic stormwater conveyance and vegetated LID facilities provide screening at Estacada Library (Source: Low Impact Development Approaches Handbook) Staff requested a plant list that is suitable for bioretention to be cited in 18.52.030.D to support LID implementation. Staff also noted that when bioretention is proposed to serve as required screening, then plant selection and placement must be reviewed both by Planning and by Public Works and must meet the intent of both purposes. To facilitate use of bioretention, ensure landscaping review allows flexibility for plant selection and placement as long as public safety is not compromised. Landscaping for Street Frontages Allowing bioretention into landscaped areas in street frontages is an effective way to integrate stormwater management in urban infill and redevelopment settings where land is constrained. Low Impact Development Code Update 12 Findings and Recommendations Report otak i Section 3—Landscaping and Native Vegetation Continued Figure 2 — Bioretention integrated into urban landscape strip, Beaumont Village, Portland, OR (Source: Low Impact Development Approaches Handbook) Landscaping for street frontages is discussed in the Comprehensive Plan, Title 11 — Right - of -Way Use, Tide 17 — Subdivision, Title 18 — Zoning, and the IDCS. Like screening, allowing bioretention and other native vegetation in landscaping area of street frontages supports the goal of making LID more common. In addition street trees often required in street frontages are supportive of LID. MDR (18.12) and residential commercial (18.20) zones both have street frontage landscaping requirements but do not mention bioretention. TUC (18.28) already encourages landscaped areas within the street ROW and elsewhere to contain or act as functional stormwater facilities. Where bioretention is allowed to serve as landscaping, exceptions should be made when soil preparation requirements are given in zoning code, since soil preparation for bioretention should follow requirements in the 2016 KCSWDM. IDCS discusses timing, responsibilities, specifications, and maintenance of street frontage improvements. These are supportive and do not require any changes to support implementation of LID. Low Impact Development Code Update 13 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued Staff expressed concern for health of street trees in the City, which appear to suffer from insufficient space, poor planting methods, and pollution10. Landscaping in Parking Lots Interior and perimeter landscaping areas in parking lots are a popular location to integrate bioretention stormwater management, allowing stormwater to be managed for the parking lot within its own footprint. Parking lot landscaping requirements are discussed in Title 18 — Zoning and in the Comprehensive Plan. General landscaping for parking lots is set in 18.52 — Landscape, Recreation, Recycling/ Solid Waste Requirements, while separate standards are set for the Shoreline zone (18.44) and TUC (18.28). In the Shoreline District, native trees and shrubs are required, which is supportive of LID practices. TUC encourages and gives flexibility to integrate stormwater management into parking lot landscaping, except where a heavy perimeter screen is required. The same flexibility could be added to 18.52 to support integration of LID. Staff expressed concern that shade still be provided in parking lots, so flexibility to use bioretention should still require use of trees that are appropriate for the facility. Staff also expressed general concern over health of trees in parking lots11. 10 LID Team Meeting, February 23, 2016. 11 Ibid. Low Impact Development Code Update 14 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued Figure 3 — Bioretention swale as parking lot landscaping (Source: University of Florida, Op/ /%ort.refl.edrt/woody/park.in; island-examples.shtml) Landscaping Site Preparation Tukwila discusses landscaping site preparation in 18.52 — Landscape, Recreation, Recycling / Solid Waste Space Requirements for general landscape and screening requirements. Since all developed pervious areas on sites that trigger stormwater management requirements will need to follow King County Code 16.82.100.G for preserving the soil moisture capacity, which entails amending site soils, the requirement for site preparation should reference these requirements. Trees and Bioretention To support use of bioretention in landscaped areas where trees are required, Tukwila could provide applicants with a resource list of trees suitable for use in bioretention. This list could further indicate categories for street trees and parking lot trees. Recommendations Tree Preservation 5. Update general standards in 17.20.030 to prioritize retention of native vegetation. Low Impact Development Code Update 15 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued 6. Define native vegetation in Title 17 using a definition similar to the definition of native vegetated surface in the 2016 KCSWDM. 7. Remove the exemption in TMC 18.54 for clearing vegetation on sites that are not located in a critical area or buffer. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. 8. Prioritize tree retention following guidelines in the LID Technical Guidance Manual, section 4.1, page 76. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. 9. Specify tree protection measures during construction following guidelines in the LID Technical Guidance Manual, section 4.1.1, pages 77-79. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. — I 10. Develop a tree list for 18.54 that focuses on native species, and considers suitability for use in the right of way. Screening tolidSC 11. Update footnote 1 in 18.52 to explicitly allow bioretention to serve as up to 20% of the front yard landscaping of MDR and HDR, which already allow pedestrian and transit facilities under a Type 2 decision. 12. Update footnote 3 in 18.52 to explicitly allow bioretention to serve as part of required landscaping in RCC, TVS, and TSO districts. 13. Update 18.52.030.A to explicitly allow bioretention to serve as Types I landscape perimeters provided that equal mitigation of visual impacts is achieved. 14. Update 18.52.030.B to explicitly allow bioretention to serve as Types II landscape perimeters provided that equal mitigation of visual impacts is achieved. 15. Develop and require use of a plant list suitable for bioretention that will also contain plants suitable for screening and aesthetic purposes, such as ornamentals. 16. Add statements allowing flexibility in plant selection and placement in Types I and II landscape perimeter when incorporating bioretention as long as public safety is not compromised and the intent of the screening is met. 17. When bioretention is proposed to serve as required screening, plant selection and placement must be reviewed both by Planning and by Public Works. Require submittal of preliminary plant selection and placement in the landscaping plan Low Impact Development Code Update 16 Findings and Recommendations Report otak Section 3—Landscaping and Native Vegetation Continued during land use review; engineering review should determine that plant selection and placement is appropriate for facility function. Landscaping in Street Frontages 18. Update 18.12 MDR and 18.20 residential commercial to allow bioretention in the street frontage to meet landscaping requirements. 19. Update soil preparation requirements in 18.28.240 TUC to create a category for bioretention soil preparation. Include avoidance of compaction and refer to the 2016 KCSWDM for specific soil amendments. 20. For IDCS, develop a planting standard detail for street trees, including minimum soil volume and an option for tree pits in non-residential districts. Landscaping in Parking Lots 21. Add flexibility in 18.52 to allow bioretention to serve or meet setback and perimeter landscaping requirements except where a heavy screen is required. 22. Add flexibility in 18.52 to integrate bioretention into interior parking lot landscaping, similar to existing language in 18.28. 23. Insert a minimum soil volume for parking lot trees into 18.52. Trees and Bioretention 24. To support use of bioretention in landscaped areas where trees are required, develop a resource list of trees suitable for use in bioretention. Further indicate categories for street trees and parking lot trees. Low Impact Development Code Update 17 Findings and Recommendations Report otak / i / Section 4—Design Guidelines and Standards Design guidelines for buildings, site design, and street design may increase impervious cover or specify vegetation that is incompatible for use in LID BMPs. Removing these impediments where reasonable supports the goal of making LID the preferred and commonly used approach to site development. Findings Continuous Curb Requirements Curb and gutter are required in Tide 17 — Design Standards for Land Division and the IDCS contains several details for curb and gutter. Continuous curb is not explicitly required in any standard we reviewed. However, there is no standard detail for a curb cut or for sheet flow entry of flows into bioretention or dispersion trenches. While not prohibited, use of curb cuts to allow surface flows into ROW and parking lot bioretention facilities could be supported by inclusion of standard details showing the entrances. Curb Radii Smaller curb radii can leave more room in the streetscape and ROW for inclusion of landscaping and stormwater management features that are appropriate for use in the ROW. The IDCS does not list curb radii. The IDCS does reference curb radii in the Comprehensive Plan; however we did not find a discussion of curb radii in the Comprehensive Plan. Recommendations Continuous Curb Requirements 25. For IDCS, Develop standard details for various entrances to bioretention similar to Figures 4 and 5, below. Curb Radii 26. Add a statement in IDCS Chapter 4 encouraging use of the smallest curb radius necessary to achieve the goals at each intersection. Low Impact Development Code Update 18 Findings and Recommendations Report otak Section 4—Design Guidelines Continued 6 318' PRE -MOLDED JOINT FILLER (TYP.) SEE TYPICAL ROADWAY SECTIONS THICKENED CONC. CURS AND GUTTER 7 CRUSHED SURFACING SASE COURSE LIMITS OF CURB CUT 4' STREAMED COBBLES AND ONE MAN BOULDERS THICKENED CONC. CURD AND GUTTER SIDE CURB CUT DETAIL A NTS "— 16r14 TOP OF CURB GUTTER LINE STREET SLOPE CURB CUT TYPE 2 SECTION A -A NTS DROP 12' LAYER OF {• STREAMBED COBBLES PER 1-D9.11 (2) BIORETENTION SOIL MIX SIDE CURB CUT SECTION B-B nas APPROVED BY: GARY M. SCHWA NATURAL RESOURCES/STO U. WATER ENGINEERING MANAGER REV151ON DATE: Q1, 2015 1 oyrd ...4 STANDARD DETAILS IISIORIETEPIT1G11 aura CURS CUT FILENAME: 15t6S6,DWD 'DETAIL NUMBER; 665 Figure 4 — City of Redmond side curb cut to bioretention detail Low Impact Development Code Update 19 Findings and Recommendations Report otak Section 4—Design Guidelines Continued SIDENOLk ES 11' Ef1STKG COB T E7f1511NG CURB NLET SEE CETAL C. NOTE 1) FORERA•- 4' OF 4'-2' aLL.AST AGGREGATE OR 4' THICK CONCRETE PAD DETAIL A INLET FLAN VIEW as DETAIL 8 OUTLET CURB PLAN • MA R!NO AUf f t' N4 ALL 7' DROP FR04 GUTTER TO FDREBAY CMS THICKENED CURB AND GUTTER PER STD DRASM1hG P-540 r'� DETAIL C INLET ISOMETRIC VIEW ETAIL D OUTLET NOTCH NOTES: r MIN EELON INLET ELEVATION 1, Additional Inlets can be added If necessary (preferably knmedlately downstream of each clack dam to minimize potcnllal backflow). Additional Inlets are not recommended for streets sloped <1%. Z Detals A and C: For use on local sero a streets oriy, 3. Inlet may be modMed to maximize flow entry to stormwater faclllry. STORMWATER MANAGEMENT MANUAL TYPICAL DETAILS ILRau of Froinmrnntxl Salim D - 2010 Green Streets - Inlet/Outlet For Curb Extensions Curb Inlets O NULIL4 SW-335 REVISED: 02/0S/10 11:16 Figure 5 — City of Portland inlet/outlet to bioretention curb extension Low Impact Development Code Update 20 Findings and Recommendations Report otak Section 5—Hard and Impervious Surfaces Coverage of land with hard and impervious surfaces can be regulated through limitations on impervious cover by zone or by use, minimizing space taken up by driveways, and encouraging use of permeable materials where reasonable. Several sub -topics are discussed below. As a general rule, it may be beneficial to develop a common understanding that discussion of the terms pavement, paved, concrete pavement, asphalt pavement, and similar terms are construed to mean the permeable versions of these surfaces where allowed or required by the 2016 KCSWDM, unless explicitly prohibited by Tukwila. Given that none of these terms are currently defined in either Title 18 or the IDCS, this understanding may best be served by inserting a new section in IDCS Chapter 4 — Streets. Findings Maximum Impervious Surface Allowances Tukwila regulates impervious surface coverage for Planned Residential Developments (PRD) (18.46) and for medium and high density residential zones in 18.50. The PRD limitation is 50% coverage on sites with sensitive areas. Coverage of single-family lots is not regulated. The term Tukwila uses for this standard is "development area coverage." Currently, "development area" refers exclusively to impervious surfaces and exempts some surfaces such as "sidewalks, paths, and other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment" (18.06.215). The intent of regulating coverage would also be to regulate placement of pervious hard surfaces, such as a permeable pavement driveway, equally with their impervious counterparts. Also, the large list of exemptions could be creatively applied to still achieve almost total coverage of a single-family lot. The limitation for MDR and HDR is 50%, with an allowed increase up to 75% for townhome development when LID techniques are used. Staff has indicated that these code provisions are not widely used and are not a priority for update". However, staff has expressed concern that some single-family lots are paved over completely when new homes are built in existing neighborhoods, contrary to LID practices13. Therefore, regulating development area coverage on single-family lots could support LID and address an existing concern. 12 Ibid. 13 Ibid. Low Impact Development Code Update 21 Findings and Recommendations Report otak Section 5—Hard and Impervious Surfaces Continued Shared Driveways Tukwila's 2015 Comprehensive Plan includes an implementation strategy in the Transportation Element to develop methods to incentivize shared driveways. Staff indicated that they will work on developing the response to this policy outside of this process of LID code updates. Minimum Driveway Width Establishing a narrower minimum driveway width can support the goal of reducing impervious surfaces in development. Tukwila standard details in the IDCS include three residential and one commercial driveway options, which show driveway width between 10' and 20' for residential and 25' to 35' for commercial. Staff indicated that the local interpretation of International Fire Code Appendix D's requirement for fire apparatus access roads of 0'-150' in length to be a minimum width of 20' includes all driveways". Roads that require access for aerial apparatus are a minimum of 26'. Staff also indicated that plentiful residential parking on single family residential lots is popular with residents. Thus decreasing minimum driveway width likely would not result in on -the -ground decreases in impervious surfaces due to customer demand. TMC 18.28.260 General Parking Requirements for TUC limits commercial driveway width to 15' for one lane and 30' for two lanes. It also limits maximum driveway width in the Workplace District to 35'. Driveway width is not regulated for other districts. Permeable Paving for Driveways Use of permeable paving for driveways is not discussed in Tukwila's codes and standards. Staff expressed concern about strength when used for fire access. Permeable paving will need to be allowed for driveways for Permit compliance; however it may not be necessary to specifically call it out. Submitted engineered designs will need to demonstrate ability to handle loading requirements. Two -Track Driveway Design Two -track driveways, also called ribbon driveways or wheel strip driveways, can reduce impervious cover of driveways by allowing a permeable area between ribbons of concrete. Tukwila's codes and standards are silent on this option. These driveways will become an option under the 2016 KCSWDM. Staff indicated support for allowing this option for residential applications'. 14 Ibid. 15 Ibid. Low Impact Development Code Update 22 Findings and Recommendations Report otak 5° a /o vk Section 5—Hard and Impervious Surfaces Continued Recommendations General 27. Insert a new sub -section 4.0.16 in IDCS Section 4.0 Streets General Standards construing the uses of the words pavement, paved, concrete pavement, and asphalt concrete, and asphalt pavement to include the permeable versions of pavement materials, with appropriate and approved designs, unless specifically prohibited. Maximum Impervious Surface 28. Add language in 18.50.085 to limit development area coverage on single-family lots to 75%. 29. Amend the definition of developed area in 18.06.215 to include pervious hard 7' Y surfaces. For single-family residences, the term should not include sidewalks, paths, and other pedestrian/recreation facilities clearly designed to enhance the pedestrian . environment. Two -Track Driveway 30. Add new standard plan in IDCS for residential driveway alternate 4, showing a two - track design. Low Impact Development Code Update 23 Findings and Recommendations Report otak Section 6—Clearing and Grading and Healthy Soils Grading codes can be used to protect areas of existing infiltration, encourage conservation of native vegetation and soils, and control construction sequencing to limit disturbance. Importantly, they can assist in ensuring that areas of a site planned for use to manage stormwater with LID BMPs remain free from imported sediment and compaction. Other standards can control compost amendments to soils in landscaped areas and compaction where LID BMPs are planned. Findings Tukwila regulates clearing and grading in Title 17 — Subdivisions and Title 16 — Building and Construction through the adoption of International Building Code Appendix J. The Shoreline district also describes standards for land altering activities in 18.44.070.J. Staff indicated support for the language in 18.4416. Standards for restoring soil quality and depth after clearing and grading activities are given in IDCS Section 5.6.B, which is equivalent to King County's provision for retaining and restoring soil moisture capacity in KCC 16.82.G. The Comprehensive Plan encourages minimizing disturbance to vegetation and land in geologically hazardous areas. Generally, Tukwila's regulations regarding grading refer to steep topography (17.20.030) and do not address grading standards for all sites, conservation of soils, limitation on extent or timing of grading, or control of erosion and sedimentation. Staff indicated a concern about lack of regulation on location of stockpiles of fill for development". The ability of soil to absorb precipitation can be compromised during the development process. Standards to amend soils with compost and avoid compacting areas designated for LID BMPs will be regulated under clearing and grading and under 2016 KCSWDM. Recommendations 31. Develop a new grading ordinance replacing IBC Appendix J modeled after King County code 16.82 — Clearing and Grading, focusing on erosion and sediment control standards, seasonal limitations on grading activities, and grading standards, including a provision to protect or restore soil moisture capacity and regulation of location of stockpiles for development. Also incorporate language inspired by TMC 18.44 to limit clearing, grading and filling to the minimum necessary to accomplish the use and minimizing impacts to the natural environment. 16 LID Team Meeting #2, March 21, 2016. 17 Ibid. Low Impact Development Code Update 24 Findings and Recommendations Report otak Section 7—Bulk and Dimensional Considerations Rigid regulation of setbacks, height limitations, and placement of structures on a site can limit the flexibility needed to minimize site disturbance and locate LID BMPs in the best possible locations. Findings Building Setbacks Tukwila regulates setbacks in Title 18 — Zoning. A representative sample is shown in Table 2 below. We found that Tukwila's building setbacks are not excessive compared to neighboring cities. We have seen a low density residential front setback in a Washington city as low as 10'. Tukwila could consider reducing the front setback for residential areas to 10'. Table 3 — Selected Setbacks Front Rear Sicle Low Density Residential 20 10 5 Medium Density Residential 15 10 10 High Density Residential 15 10 10 Office/Mixed Use Office 25 10 10 Regional Commercial 20 10 10 Commercial/Light Industrial 25 5 5 Heavy Industrial 25 5 5 Height Limitations Tukwila regulates building height in each zoning district. Using a Planned Residential Development (18.46), an applicant can increase building height in order to maintain significant vegetation and enhance views as long as a commensurate decrease in impervious surface is proposed. This provision is supportive of LID; however staff has indicated that the PRD codes are not frequently used". Other developments are not afforded the opportunity to reduce lot coverage in exchange for a height bonus. In addition, height bonuses can be used to incentivize structured parking to reduce lot coverage. These bonuses may be most beneficial for non-residential and mixed used districts. Currently lot coverage is not regulated in these districts, except for TUC, so height incentives would need to be paired with a new limitation on lot coverage. 18 Ibid. Low Impact Development Code Update 25 Findings and Recommendations Report otak Section 7—Bulk and Dimensional Considerations Continued Clustering Clustering is a land use technique that provides flexibility for lot size and shape on a given site in exchange for preservation of critical areas and open space without increasing the overall density allowed on the site. Clustering in supported in the Comprehensive Plan for the Shoreline district and is allowed under the PRD in Title 18. Since clustering is most applicable to new development on large pieces of undeveloped land, which is lacking in Tukwila, we recommend no change to Tukwila's standards in this area. Recommendations Height Limitations 32. Develop a 90% lot coverage limitation for Tukwila's non-residential and mixed -use districts, with the exception of TUC. 33. Develop a two -tiered height bonus in the non-residential and mixed -use districts. Allow one story additional for structured parking that contains at least 50% of the required spaces. Allow one story additional for reduction in lot coverage to maintain/restore at least 15% of the site in native vegetation (in addition to any required landscaping and setbacks). Low Impact Development Code Update 26 Findings and Recommendations Report otak Section 8—Streets and Roads According to the Guidebook, streets and roads comprise a significant portion of impervious cover in urban areas. There are numerous opportunities to change municipal standards in order to reduce impervious cover and manage stormwater within the ROW. Findings Pavement Width Paved widths are established for various street types in Title 17 — Subdivisions. Widths are also given in IDCS detail RS-01 Typical Roadway Section. Reducing pavement width could be a consideration for new residential access roads, but is not well -supported by staff and fire safety officials'. Most new streets in Tukwila are private streets developed as part of short plat land divisions. Private streets are allowed 20' pavement width. Standards for residential retrofits could be considered. Currently Tukwila is retrofitting neighborhood streets with vertical curb and 5' sidewalks, sometimes as part of the Safe Routes to Schools program. Standards for City -sponsored retrofits will not be considered as part of this code update. Right -of -Way ROW width generally fluctuates with street pavement width and is designed to accommodate drainage, sidewalks, planting strips, and utilities. Wide ROW can encourage excessive pavement width. Since new public streets are rare in Tukwila, ROW width is not an issue we are considering. Use of curb extensions for bioretention in the ROW is a popular LID technique for managing stormwater on lower -volume streets. Although Tukwila anticipates few new public streets to result from private development activities, this technique could be used for City retrofits. 19 Ibid. Low Impact Development Code Update 27 Findings and Recommendations Report otak Section 8—Streets and Roads Continued Figure 6 — Curb extension in the parking lane containing bioretention, Clark County, WA (Source: Otak, Inc.) Use of Permeable Paving for Streets and Roads The 2016 KCSWDM will, under certain circumstances, require use of permeable pavement or a functional equivalent on roads up to 400 average daily traffic (ADT). Many other limitations will apply. Tukwila's standards are silent on the use of permeable pavements on streets and roads. Washington State Department of Transportation (WSDOT) recently added specifications for porous asphalt and pervious concrete to its Local Agency General Special Provisions (GSPs) developed by American Public Works Association (APWA). Tukwila recognizes and uses the APWA/WSDOT Standard Specifications, but not the APWA/WSDOT Local Agency General Special Provisions. Since few new public roads are constructed in Tukwila, and with addition of policy statement in IDCS 4.0.16 (see Recommendation 27), remaining otherwise silent on this issue should be acceptable, as long as use of permeable pavements on roads less than 400 ADT is not prohibited. Low Impact Development Code Update 28 Findings and Recommendations Report otak Section 8—Streets and Roads Continued Placement of Utilities Under Paved Section Placing underground utilities under the paved section of the roadway or sidewalks helps leave room in the ROW for managing stormwater using bioretention. Several sections of the IDCS discuss utility placement underground, but none emphasize placement under the paved area. Buried utilities can also pose a conflict with perrneable pavements. Tukwila's standards are silent on resolving potential conflicts. Required Turnarounds and Radii The common cul-de-sac turnaround required for dead-end streets covers a great deal of land compared to other options. Tukwila's code allows both cul-de-sacs and alternatives to cul- de-sacs; however staff indicated that in practice most turnarounds installed in the City are hammerheads20. These are far more efficient in impervious cover than cuA-de-sacs. The Fire Marshal allows reduction of one leg of the hammerhead from 45' to 30' with an exception21. Advertising the ability to reduce the hammerhead dimension would be supportive of reducing impervious cover. Finally, City policy expressed in Comprehensive Plan Policy 13.2.2 in the Transportation Element prioritizes residential access through -streets, minimizing need for turnarounds. Sidewalk Width Sidewalk widths are regulated in Tide 17 and described in IDCS detail RS-11, Sidewalk Widths and RS-08A,B,C — Residential Driveways. Widths shown in details are: Table 4 — Sidewalk Widths Minor arterial 5' Principal arterial 6' TUC 6' generally; 8' at bus stops and pullouts Residential 5' — 6' (typical, not required) Staff expressed reluctance to change sidewalk widths as compliance with Americans with Disability Act circulation requirements is paramount22. 20 Ibid. 21 Ibid. 22 Ibid. Low Impact Development Code Update 29 Findings and Recommendations Report otak Section 8—Streets and Roads Continued Sidewalk Slope Requirements for sidewalks to slope toward the street and gutter can create a barrier for use of LID techniques to manage runoff from sidewalks in the ROW. IDCS detail RS-011 shows maximum 2% sidewalk slope sloping toward the gutter. Allowing sidewalks to slope toward bioretention, if provided, supports the LID goal of managing stormwater close to its source. Permeable Pavement for Sidewalks The 2016 KCSWDM will, under certain circumstances, require use of permeable pavement or a functional equivalent on sidewalks and other pedestrian pathways. Many other limitations will apply. Tukwila's standards are silent on the use of permeable pavements on sidewalks. With addition of policy statement in IDCS 4.0.16 (see Recommendation 27), remaining otherwise silent on this issue should be acceptable, as long as use of permeable pavements is not prohibited where feasible. Staff expressed concern that pervious concrete be prohibited for use in luminaire foundations23. Recommendations Permeable Pavement for Streets and Roads See Recommendation 27. Placement of Utilities Under Paved Section 34. Add preference for buried utilities to be placed under the paved section of roadway in IDCS 4.2.4 Underground Utilities and 7.2 Water Mains. 35. In IDCS 4.2.4 insert a clause requiring installation of a new permeable pavement road surface to protect existing underground utilities and, conversely, a clause requiring new underground utility installations to take steps to protect the utility trench from infiltration when located under an existing permeable pavement. Required Turnarounds and Radii 36. Update application materials to note that an exception is available with approval from the Fire Marshal to shorten one leg of a hammerhead. 23 Villanueva, G. Personal Communication. April 4, 2016. Lou Impact Development Code Update 30 Findings and Recommendations Report otak l Section 8—Streets and Roads Continued Sidewalk Slope 37. Update detail RS-011 with a note that sidewalk should slope to gutter or to adjacent LID BMP per design. Remove arrow from slope indicator. Permeable Pavement for Sidewalks See Recommendation 27. 38. Add a note to IDCS detail RS-25 for luminaire foundation that prohibits use of pervious concrete for the foundation. Low Impact Development Code Update 31 Findings and Recommendations Report otak Section 9—Site Planning & Assessment Findings The LID approach to site design includes a careful assessment of existing conditions, allowing topography, hydrology, and soils to influence placement of buildings, parking, and stormwater facilities. Findings Tukwila does not anticipate new development on any large tracts of land since large tracts of unconstrained and undeveloped land are lacking within the City's boundaries'`'. Most residential development is in the form of the four -lot short plat on 6,500 sf lots25, providing few alternatives for placing structures and parking. For streets, IDCS 4.2.2 — Alignment and Connections for public streets encourages alignments to relate to natural topography and discourages excessive grading and excessive runoff. This is supportive of LID site planning. We found that Tukwila's policy direction is supportive of LID site planning, open space retention, and vegetation preservation. The Comprehensive Plan includes several policies supporting LID site planning for development, redevelopment, and transportation projects as shown in Table 1 in Section 1, above. Recommendations None. 24 LID Team Meeting #2, March 21, 2016. 25 Bradshaw, M. Personal Communication. April 6, 2016. Low Impact Development Code Update 32 Findings and Recommendations Report otak Section I0—Subdivision and Planned Unit Development Land divisions codes present opportunities to require open space and provide flexibility in curb and gutter style development. Undeveloped vegetated open space helps reduce effective impervious cover and manage stormwater naturally. Findings Tukwila regulates subdivisions, short subdivisions, and binding site plans in Title 17 — Subdivisions and Plats and provides development standards in Title 18 — Zoning. Generally there are no requirements to preserve native soils and vegetation in open space tracts, except in PRD where sensitive areas are on the site (18.46). Staff indicated that the PRD provisions are not used because short plats are the vast majority of residential development projects in the City'`. In the MDR and HDR districts, minimum recreation space requirements are given in Title 18. These requirements appear intended primarily to provide play areas for children; they allow, but do not emphasize, natural areas and passive recreation to meet the requirement. For standard plats and short plats in the MDR and HDR districts, limitations on development area coverage serve to protect open space to some degree. In LDR districts, we have proposed a recommendation to limit development area coverage, see Recommendation 28. Recommendations None. 26 LID Team Meeting, February 23, 2016. Low Impact Development Code Update 33 Findings and Recommendations Report otak Section I I—Stormwater Management and Maintenance Requirements for maintenance specifications for LID facilities are necessary to maintain facility function over time. Findings Maintenance criteria, instructions, and access and easement requirements are given in the 2016 KCSWDM for LID BMPs. With adoption of the updated manual, Tukwila will meet these requirements. Tukwila also regulates stormwater drainage system maintenance and inspection in Title 14 — Waters and Sewers. Maintenance Provisions Tukwila adopts the 2009 KCSWDM in Title 14 — Waters and Sewers and plans to adopt the 2016 KCSWDM by December 31, 201627. The 2016 manual contains maintenance requirements for LID BMPs. The City also adopts maintenance timelines in 14.30.080 — Stormwater Drainage System Maintenance and Inspection Requirements in accordance with NPDES 2007-2012 Permit requirements S5.C.4.c.iii and vi. If Tukwila updates these provisions to incorporate inspection requirements and timelines for LID BMPs by December 31, 2016 to comply with the 2013-2018 permit in, then maintenance provisions should be sufficient. TMC 14.30.080.A(6) establishes maintenance responsibility for private drainage facilities. Inspection Access Access for inspection of facilities on private property is necessary to ensure adequate maintenance of LID BMPs. Tukwila provides for inspection access in several sections of Title 14. TMC 14.30.080.A(4) establishes unlimited access to existing facilities when the Director has reason to believe that violations of 14.30 exist. TMC 14.30.080.B(2) requires a monitoring and maintenance schedule for new private facilities that grants unlimited access by the Public Works Department to the drainage system. These access provisions appear adequate to allow needed inspections of LID facilities. Enforcement Tukwila describes enforcement procedures for violations of stormwater drainage system maintenance and inspection requirements in TMC 14.30.080.A(5) and (7). Penalties are established in TMC 14.30.150. 27 Ibid. Low Impact Development Code Update 34 Findings and Recommendations Report otak Section I I —Stormwater Management and Maintenance Continued Recommendations Maintenance Provisions 39. Adopt the 2016 KCSWDM by December 31, 2016. This recommendation is provided to the City for use in its process to adopt the 2016 KCSWDM and comply with the Permit. 40. Update TMC 14.30.080.A in accordance with NPDES permit requirement S5.C.4.c.iii and vi by December 31, 2016. This recommendation is provided to the City for use in its process to adopt the 2016 KCSWDM and comply with the Permit. Low Impact Development Code Update 35 Findings and Recommendations Report otak Section 12—Critical Areas & Shoreline Management When compatible with a critical area, LID BMPs may be allowed in critical area buffers where traditional stormwater BMPs such as ponds and filters are already allowed. Findings Tukwila regulates critical areas as sensitive areas in TMC 18.45. Subject to administrative review, new surface water discharges to sensitive areas or their buffers from various surface water management structures are allowed if water quality standards are met and flow does not adversely affect water level fluctuations, habitat or flow rate. Bioswales and dispersion outfalls are specifically allowed in wetland and watercourse buffers. Dispersion is an LID BMP. Given the general nature of the term "surface water management structure" these provisions appears adequate to allowing LID BMPs in critical area buffers where appropriate and when supported by a sensitive areas study prepared by a qualified professional. Tukwila regulates state -classified Shorelines in TMC 18.44. Development standards in the Shoreline Overlay District specifically call for the use of LID techniques for surface water control unless infeasible. Staff indicated that lack of guidance on the definition of "infeasible" have prevented adequate enforcement of this provision'. Adoption of the 2016 KCSWDM will provide a definition and use of the term "infeasibility" and will also prioritize use of LID techniques for permanent stormwater management on all development sites. Permanent stormwater management will be required for most construction sites under the new manual. Thus, use of LID in the Shoreline district should increase when the City adopts the 2016 KCSWDM with no further action needed by the City. Recommendations None. 28 LID Shoreline and Tree Code Review Meeting, March 15, 2016. Low Impact Development Code Update 36 Findings and Recommendations Report otak Section I 3—Summary The purpose of this report is to provide City decision -makers with concepts for code updates and to obtain approval to begin drafting updates pursuant to the recommended concepts. We propose to update the following sections or chapters of Tukwila's standards using concepts described above: • TMC 14.30 Surface Water Management • TMC 17.20 Design and Improvement Standards for the Subdivision of Land • TMC 18.06 Definitions • TMC 18.12 Medium Density Residential • TMC 18.20 Residential Commercial • TMC 18.28 Tukwila Urban Center • TMC 18.50 Supplemental Development Standards • TMC 18.52 Landscape, Recreation, Recycling/Solid Waste Space Requirements • TMC 18.54 Tree Code • TMC 18.56 Off -Street Parking and Loading • Infrastructure Design and Construction Standards We also provided recommendations for the City's consideration in its update of: TMC 18.54 Tree Code and adoption of the 2016 KCSWDM. Our recommendations focus primarily on supporting tree preservation and canopy; improving standards for grading; ensuring that standards for vegetation retention and restoration focus on native species; and encouraging integration of bioretention in areas already set aside for landscaping, screening, and road ROW. We summarize our justification for each recommendation using six categories: 1. The recommendation removes a conflict with or barrier to implementation of required LID BMPs in the 2016 KCSWDM. 2. The recommendation makes designing and implementing LID BMPs easier, by providing a standard details or guidance, for example. 3. The recommendation makes a sweeping change emphasizing LID principles and techniques in a variety of common development circumstances in Tukwila. 4. The recommendation makes implementation of LID principles and techniques easier in a common development circumstance in Tukwila. 5. The recommendation supports a specific Comprehensive Plan policy. 6. The recommendation is requested by staff. Low Impact Development Code Update 37 Findings and Recommendations Report otak Section I 3—Summary Continued Table 5 — Recommendation Categories No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 1 Add a new section in 18.56 Off -Street Parking and Loading to require any parking spaces provided above the minimum in a parking lot to use pervious materials, if feasible in accordance with the stormwater manual. x 2x Add a preference within 18.56 Off -Street Parking and Loading for use of permeable pavements for off- street parking, if feasible in accordance with the stormwater manual. 3 Delete the largest set of parking stall dimensions for each angle from Figure 18-6. x 4 Add structured parking to the list of items in 18.28.070 Tukwila Urban Center allowed for height bonus to 70 feet or 115 feet. x 5 Update general standards in 17.20.030 to prioritize retention of native vegetation. x x x 6 Define native vegetation in Title 17 using a definition similar to the definition of native vegetated surface in the 2016 KCSWDM. x x x x 7 Remove the exemption in TMC 18.54 for clearing vegetation on sites that are not located in a critical area or buffer. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. x x x x 8 Prioritize tree retention following guidelines in the LID Technical Guidance Manual, section 4.1, page 76. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. x Low Impact Development Code Update Findings and Recommendations Report 38 otak Section I 3—Summary Continued No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 9 Specify tree protection measures during construction following guidelines in the LID Technical Guidance Manual, section 4.1.1, pages 77-79. This recommendation is provided to the City for use in its ongoing update of TMC 18.54. x 10 Develop a tree list for 18.54 that focuses on native species, and considers suitability for use in the right of way. x x x 11 Update footnote 1 in 18.52 to explicitly allow bioretention to serve as up to 20% of the front yard landscaping of MDR and HDR, which already allow pedestrian and transit facilities under a Type 2 decision. x x 12 Update footnote 3 in 18.52 to explicitly allow bioretention to serve as part of required landscaping in RCC, TVS, and TSO districts. x x 13 Update 18.52.030.A to explicitly allow bioretention to serve as Types I landscape perimeters provided that equal mitigation of visual impacts is achieved. x x 14 Update 18.52.030.B to explicitly allow bioretention to serve as Types II landscape perimeters provided that equal mitigation of visual impacts is achieved. x x 15 Develop and require use of a plant list suitable for bioretention that will also contain plants suitable for screening and aesthetic purposes, such as ornamentals. x x x Low Impact Development Code Update Findings and Recommendations Report 39 otak Section I 3—Summary Continued No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 16 Add statements allowing flexibility in plant selection and placement in Types I and II landscape perimeter when incorporating bioretention as long as public safety is not compromised and the intent of the screening is met. x x x 1 When bioretention is proposed to serve as required screening, plant selection and placement must be reviewed both by Planning and by Public Works. Require submittal of preliminary plant selection and placement in the landscaping plan during land use review; engineering review should determine that plant selection and placement is appropriate for facility function. x x 18 Update 18.12 MDR and 18.20 residential commercial to allow bioretention in the street frontage to meet landscaping requirements. x x 19 Update soil preparation requirements in 18.28.240 TUC to create a category for bioretention soil preparation. Include avoidance of compaction and refer to the 2016 KCSWDM for specific soil amendments. x 20 For IDCS, develop a planting standard detail for street trees, including minimum soil volume and an option for tree pits in non-residential districts. x x x x x 21 Add flexibility in 18.52 to allow bioretention to serve or meet setback and perimeter landscaping requirements except where a heavy screen is required. x x x 22 Add flexibility in 18.52 to integrate bioretention into interior parking lot landscaping, similar to existing language in 18.28. x x x Low Impact Development Code Update Findings and Recommendations Report 40 otak Section I 3—Summary Continued No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 23 Insert a minimum soil volume for parking lot trees into 18.52. x x x 24 To support use of bioretention in landscaped areas where trees are required, develop a resource list of trees suitable for use in bioretention. Further indicate categories for street trees and parking lot trees. x x x x 25 For IDCS, Develop standard details for various entrances to bioretention similar to Figures 4 and 5, below. x x x 26 Add a statement in IDCS Chapter 4 encouraging use of the smallest curb radius necessary to achieve the goals at each intersection. x 27 Insert a new sub -section 4.0.16 in IDCS Section 4.0 Streets General Standards construing the uses of the words pavement, paved, concrete pavement, and asphalt concrete, and asphalt pavement to include the permeable versions of pavement materials, with appropriate and approved designs, unless specifically prohibited. x x x 28 Add language in 18.50.085 to limit development area x x coverage on single-family lots to 75%. '. 29 Amend the definition of developed area in 18.06.215 to include pervious hard surfaces. For single-family , , x residences, the term should not include sidewalks, paths, and other pedestrian/recreation facilities clearly designed to enhance the pedestrian environment. 30 Add new standard plan in IDCS for residential driveway alternate 4, showing a two -track design. " x x 60, )\ ftb Low Impact Development Code Update Findings and Recommendations Report 41 otak / Section I 3—Summary Continued No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 31 Develop a new grading ordinance replacing IBC Appendix J modeled after King County code 16.82 — Clearing and Grading, focusing on erosion and sediment control standards, seasonal limitations on grading activities, and grading standards, including a provision to protect or restore soil moisture capacity and regulation of location of stockpiles for development. Also incorporate language inspired by 18.44 to limit clearing, grading and filling to the minimum necessary to accomplish the use and minimizing impacts to the natural environment. x x 32 Develop a 90%�ot covera e limitation for Tukwila's x non-residential and mixed -use districts, with the exception of TUC. 33 Develop a two -tiered height bonus in the non- residential and mixed -use districts. Allow 1 story additional for structured parking that contains at least 50% of the required spaces. Allow 1 story additional for reduction in lot coverage to maintain/restore at least 15% of the site in native vegetation (in addition to any required landscaping and setbacks). �' - , x 34 Add preference for buried utilities to be placed under the paved section of roadway in IDCS 4.2.4 Underground Utilities and 7.2 Water Mains. x 1tr • Low Impact Development Code Update 42 Findings and Recommendations Report otak Section I 3—Summary Continued No. Recommendation Removes Barrier/Conflict Supports LID BMP Use Sweeping Change Common Circumstance Supports Comp Plan Staff Request 35 In IDCS 4.2.4 insert a clause requiring installation of a new permeable pavement road surface to protect existing underground utilities and, conversely, a clause requiring new underground utility installations to take steps to protect the utility trench from infiltration when located under an existing permeable pavement. x x x 36 Update application materials to note that an exception is available with approval from the Fire Marshal to shorten one leg of a hammerhead. x 37 Update detail RS-011 with a note that sidewalk should slope to gutter or to adjacent LID BMP per design. Remove arrow from slope indicator. x x 38 Add a note to IDCS detail RS-25 for luminaire foundation that prohibits use of pervious concrete for the foundation. x x 39 Adopt the 2016 KCSWDM by December 31, 2016. This recommendation is provided to the City for use in its process to adopt the 2016 KCSWDM and comply with the Permit. x 40 Update TMC 14.30.080.A in accordance with NPDES permit requirement S5.C.4.c.iii and vi by December 31, 2016. This recommendation is provided to the City for use in its process to adopt the 2016 KCSWDM and comply with the Permit. x Low Impact Development Code Update Findings and Recommendations Report 43 otak / Section I 4—References City of Portland (2010). Stormwater Management Manual Typical Details. City of Redmond (2015). Standard Details. City of Tukwila web page: http://w w.tukwilawa.gov/departments/economic- devclopment/data-and-demographics/ (retrieved May 6, 2016) City of Tukwila web page: http://wvvw.tukwilawa.gov/departments/police/admhustration/ (retrieved May 6, 2016) Clean Water Services. (2009). Low Impact Development Approaches Handbook. Hillsboro, OR. James River Association. (2011). Examples of Code and Ordinance Language for Better Site Design. Richmond, VA. King County. (2016). Surface Water Design Manual. Seattle, WA. Puget Sound Partnership. (2012). Integrating LID into Local Codes: a Guidebook for Local Governments, prepared by AHBL. Tacoma, WA. University of Florida web page: http://hort.utl.edu/woody/parking-island-examples.shtml (retrieved October 1, 2015). Washington Department of Ecology. (2012, reissued 2015). Western Washington Pbase II Municipal Stormwater Permit. Olympia, WA. WSU Extension and Puget Sound Partnership. (2012). Low Impact Technical Guidance Manual for the Puget Sound. Puyallup, WA. Low Impact Development Code Update 44 Findings and Recommendations Report otak Meeting Summary 700 Washington Street Suite 401 Vancouver, WA 98660 Phone (360) 737-9613 Fax (360) 737-9651 Meeting: LID Introduction and Team Kickoff Project No.: 32634 Meeting Date: February 23, 2016 Meeting Time: 1 PM - 4:45 PM Location: Tukwila Community Center Attendees: See Sign -in Sheet Summary By: Jesse Reynolds Parking • Minimum/Maximum Parking Ratios— o City just redid parking code last month and council took a lot of heat —Title 8 and Title 9 has regs as far as how many cars can be on a lot and they need to be on impervious surface o Title 17 - No gap in 17 o Title 18 — ■ TUC — no gap ■ Shorelines — no gap • 18.56(60) — Residential parking — opportunity to reduce new impervious surface. Legislative intent was large group homes. Council wanted to maintain single family character so if these homes go in they need to have parking on. • Maximum 30% is fine if Tukwila lets them o Shared parking — complimentary parking is allowed (18.76?). This should be retained. City would possibly be supportive of incentives for shared parking. • Is there enough commercial development happening so shared parking will make a difference? • Need a permeant shared agreement. One owner needs to meet their requirements to offer sharing • Joint use works if timing is different (i.e. office and food). ■ Should add language so that developers explore shared parking. • Permeable pavement allowed? — o Percocrete does not have quarter inch gaps, works for ADA o A helpful tool would be a list of projects that have used these techniques for Tukwila K:\project\32600\32634\Admin\Meetings\Tukwila-LIDKickoffMeeting Sumtnary.docx Meeting Summary February 23, 2016 Page 2 o There are trainings through Ecology for contractors — this should be a pre -qualifying requirement for installation that the contractor has completed the training to properly install. This should be a condition of the permit for private development and public works projects. Normally inspectors don't check sidewalks, but if the sidewalk is a stormwater facility it needs to be done. With this there needs to be an inspection easement to check for ongoing inspection. This will need to be included in code o Could there be a blanket easement for maintenance? This is currently being discussed with the city attorney o Inspectors need to know what to look for — these inspection techniques are reference (most likely) in the King County manual • Parking stall dimensions — o Title 17 — no conflict o Title 18 — ■ Figure 18.6 — three options — the largest option is bigger than normal spaces, but two others do meet LID recommendations. We recommend to eliminate the larger set and go down to two stall sizes. They think this will work. Stall sizes have not been looked at for a while. They don't ever use the big one anyway. • Compact stalls can be up to 30% of parking spots. Tukwila feels this is reasonable. Can require half of the compacts to be closer to the door due to convenience. This is a requirement in the building code. • Driving aisle dimensions — o No comments • Off-street parking regulations — • Structured parking — Desirable but not very feasible. Would need to offer an incentive for this because it's expensive. Traffic impact fees could work but there would still be traffic problems o P&R needs more parking — this should work with Sound Transit o Some exists at mall o Can't put below ground due to shallow water table o Incentives - ■ Could incentivize height if parking is multi -story aboveground. Redmond does this and gives incentives on stormwater fees. • Height bonus program exists in Tukwila urban center. Exists where there is multi -family and LEED. There are two tiers in this — if do both can have 115ft, if do one get 70ft. Could add a third tier for multistory parking • For all of this we need to go to planning commission Landscaping/Native Vegetation/Street Landscaping • Tree code update is happening currently K:\project\32600\32634\Admire\Meetings\Tukwila-LIDKickoffMeeting Summary.docx 1 Meeting Summary February 23, 2016 Page 3 o They would like Otak provide recommendations of updates in support of LID. Tree canopy and attenuating stormwater are a concern. Going to planning commission in October, hoping to have a draft ordinance in May. • Tree preservation o We don't need to discuss a whole lot because of abovementioned. o Currently code is a little confusing. This can be discussed at a later date. ***** Schedule a meeting o Street trees get ran over • Screening — bioretention can serve as a screen o Possible to emphasize native vegetation and conifers for screening? Yes, can put preferred but not required because it depends on the planting area. Ornamental conifers should be fine. Conflicting advice from police dept because they can be a good place to hide — so should prune them up, but that is relative to the species o 18.52 — table that shows all types of screening. Footnote 1— could this also explicitly allow bioretention features in medium/high density residential? Yes if it is designed and maintained properly. This can be dealt with in inspections. Footnote 3 — Could explicitly allow bioretention as landscaping? This works if tree does not shade out bioretention. o Considering counting community gardening as open space. o Need to somehow provide incentive for LID because both LID and open space requirements will be double dinging the developer for space requirements o 18.52 Type 1 and Type 2 screes — could LID serve as screen? Could dispersion be used? — geared towards residential areas. Wooden weirs have been used. They would like to see examples. o Don't want that there are only a few types of trees that can withstand bioretention that takes over the landscape. Could there be flexibility of landscaping type? Just need to figure out how to word it to make it work. No reason you should not allow this in suite of vegetation, just need proper technical language. Could say bioretention as long as there are certain species and ornamentals only around the edge for example. o Is it possible to provide flexibility in number and type of trees? • Landscaping reqs for street frontages o Residential streets — unwritten policy where new residential streets don't have to have landscaping. This policy needs to be revisited to accommodate street trees. o Title 11 ROW use — inspection of the trees going in needs to improve. Soil underneath tree is too compact and so roots grow horizontal. Need to expand requirement for proper soil amendment. Also, the trees have a short lifespan due to oil and crud. Filterra strips have been successful in last couple of years o Title 18 — could explicitly allow bioretention in front and rear landscaping in medium residential, residential commercial? Sure as long as impede emergency access, required to have flat area for ladders, nothing under a rescue width (TMC 16). Also, concern of how they look — developers could try to cut corners and they could look ugly. Also long- K:\ project \32600\32634\Admin\ Meetings \Tukwila-LIDKickoffMeeting Summary.docx Meeting Summary February 23, 2016 Page 4 term maintenance is a concern. Can say as long as requirements of both are met it is fine. Could also implement a shorter draw -down time o Title 17 — one tree requirement in yards, but not going to get much traction for conifers o Design and Construction standards — incorporate LID in frontage improvement requirements Item B and a Preference in Item I for methods to handle surface water and 4.2.6 for native vegetation. Perhaps add a plant list that is appropriate for LID and Tukwila's landscaped areas. Will the city support this list? • Commercial is Ok? Street tree list was being developed a while ago, and need to revisit. Might as well require bioretention as well. • Design and Construction standards have been in review for four years, and will have to be revisited. Now is a great time to give recommendations. It may happen this year. This won't be part of the LID process but they probably do want language. o Comp plan was supportive • Landscaping reqs for parking lots - Is there enough required landscaping? o Title 18 good o Urban Center dist — want to allow bioretention to meet this req except where heavy screening is required. o 18.52(35) — seem conducive to allow bioretention. Required landscaping in middle? In TUC this is allowed. Want to allow flexibility for landscape clustering in parking lots, especially in areas with soil that has better retention. Though losing shade on a parking lot could be a disadvantage. Structural soil requirements could help this as well. This could be done with a soil amendment. In TUC there is already soil requirement. o Could there be flexibility in some but not all parking lot islands? Yes flexibility is possible. The more places that it could be designed the better. o Comprehensive plan — identify parking lot reqs to encourage tree canopy in parking areas. o Cul-de-sacs — new ones have to have landscaped island. Could allow bioretention? Hammerhead areas are used a lot. Can tell Ecology this o Soil preparation instructions — should be harmonized with soil moisture reqs with KC manual o Submittal timing — landscaping can come after occupancy — need to have landscaping with civil. This happens most of the time but may want to require it. • Financial feasibility — burden to developers — research has shown it is not as negative as originally thought. Wood Springs site is a Tukwila example of success. **** Send around some studies to support for commercial and retail areas Design Guidelines and Standards • Trees and bioretention and other plants o Otak will develop a plant list o Bioretention in ROW o Screening K:\project\32600\32634\Admin\Meetings\Tukwila-LIDKickoffMeeting Summary.docx i / -1. t _i mow' Meeting Summary February 23, 2016 Page 5 o Street tree list is being worked on o Other helpful things? ■ Raingardens for homeowners — in workbook. • Continuous curb o Design standards for land division — did not find a req for continuous curb. May be something in 18.56, for curb where car is parked o Public Works design book does have requirement • Curb radii o Did not find much to worry about • Supplemental design standards 18.50 — concrete product must enclose building. Alternative foundations should be an option, though are not very popular — need to check for seismic zone requirements, international code ASCI 7. In zoning code the legislative intent was to disallow mobile homes. Modular homes are not under international code, but under L&I. Jerry should be able to help with this, we should check with him. It might be worthwhile to add an exception for pin and pier foundation systems. Hard and Impervious Surfaces • Maximum impervious surface reqs — o Zoning code addresses this with maximum building footprint on single family home. o Sensitive areas • Shared driveways— o Support in comp plan. o Incentive program? Only policy, so next step is implementation of incentive program. We should identify where this should be place so there is a nexus between comp plan policies and new stormwater regulations • Minimum driveway width — o In Infrastructure Design Manual there is maximum for residential and commercial where driveway attaches to road, but not for rest of driveway. Currently 26ft for safety ■ Council adopted this o Ch 4 of design standards should have a 20ft driveway width maximum • Use of permeable pavement for driveways — o Not existing but have been encouraging it and has occurred in a few places. o Holiday Inn Express public works said pervious pavement should only be used in parking spot but not main driving areas • Two -track driveway design — o Option in KC manual to reduce impervious surface but not anywhere in Tukwila code. Tukwila should allow this. And this is ok for Emergency in residential. This didn't bode well in a development in Kirkland. Grasscrete could be allowed instead. o ICDS concrete standards should include definitions for pervious concrete and asphalt materials • Any time there are land use regulation changes we have to do a SEPA K:\project\32600\32634\Admire\Meetings\Tukwila-LIDKickoffMeeting Summary.docx Tukwila Low Impact Development Code Review Discussion Sheets Draft: February 20I 6 Prepared by Otak, Inc. Trista Kobluskie I Jesse Reynolds I Kaela Mansfield Russ Gaston, Project Manager : r1s_(1-4,61c. 1 / February 2016 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion & Follow-up sis ;Discussion Sheet Status of Sub Topic Minimum/maximum parking ratios ❑ Yes Title 17 —Subdivisions 17.16.030 @(A)(9) Parking calculations demonstrating the requirements of Ch. 18.56 have been met are required for a completed Binding Site Improvement Plan (BSIP). No conflict in Title 17. Will address parking ratios in discussion of Title 18. /1 No ❑ Does not apply Minimum/maximum /1 Yes Title 18 — Zoning Guidelines for provision, location and @ (3) Maximum of 30% of spaces are parking ratios n No 18.28.260 — TUC General design of parking in TUC. Number of allowed to be compact. Consider requiring n Does not apply Parking Requirements spaces given by use as established in some spaces to be compact. Table 18-5, same as for general zoning districts. Parking reduction credits are given and shared parking is allowed @ (5) New on -street parking meets minimum parking for commercial, and parking near transit centers may be reduced. Shared parking is allowed; with a parking study giving justification, number of required spaces may be reduced. 18.44 — Shorelines @ 070.1 — Off Street Parking is discussed with discussion of screening that includes requirements for additional screening using standards from the Supportive. Vegetation Protection and Landscaping section. LID measures are also required. '� f ! '- D 0 -'� 18.56 — Off -Street Parking & Loading @ 065, Residential Parking, requires 2 off-street spaces for each dwelling unit Are the additional off-street spots necessary? Can these requirements be / , , a v �� up to 3 bedrooms, and 1 additional for every 2 bedrooms in excess of 3. reduced? @ 090, Compact Car Allowance, maximum of 30% of spaces may be compact Consider requiring, instead of allowing, some spaces to be compact. Consider adding a new section that requires spaces provided above the min. to be compact, pervious or both. Minimum/maximum ❑ Yes Comprehensive Plan @ Policy 1.8.1— Maintain and Keep language. This language is parking ratios No Community Image and periodically revise parking standards to supportive. ❑ Does not apply Identity — Pg. 1-16 not exceed parking needs and allow flexibility. Parking I page 1 tv`C /I y',W,PO .( 3; a)/-ib1`1Z Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gao Identified Section/Pape Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion & Follow-up elft Status of Sub Topic Tukwila International Boulevard = Pg. 8-11 @ Policy 8.5.1— Recognize parking needs will be less for areas next to transit and neighborhood shopping streets. Keep language. This language is supportive. Use of permeable paving ►1 Yes All code titles and documents Did not find a discussion on use of permeable pavements for parking Opportunity to encourage use of permeable paving, particularly for parking overflow. This may be unnecessary with adoption of KCSWOM, which has permeable paving as an option for all development types in Core Requirement #9, Flow Control BMPs, No n Does not apply Parking stall dimensions I I Yes Title 17 - Subdivisions 17.16.030 @(A)(9) Parking calculations demonstrating the requirements of Ch. 18.56 have been met are required for a completed Binding Site Improvement Plan (BSIP). No conflict in Title 17. Will address parking dimensions in discussion of Title 18. No ❑ Does not apply Parking stall dimensions Yes ❑ No n Does not apply Title 18 — Zoning 18.56 —Off-street Parking and Loading Regulations Stall and aisle dimensions are given in Figure 18-6. For angle spaces, Tukwila gives three options sets of dimensions for each angle of regular size parking stall. @ 040.2, allows 2' landscaping overhand to count toward stall length @ 040.3, allows tandem parking spaces in MDR and HDR zones The largest set of dimensions for each angle exceeds the dimensions recommended by Better Site Design. Recommend eliminating the largest set of dimensions for each angle, leaving two options. This is supportive of impervious surface reduction and should be retained Presumably this reduces impervious cover by allowing reduction of aisle width and/or reducing number of aisles needed Driving aisle dimensions ❑ Yes Title 18 — Zoning See discussion of stall dimensions. // No ❑ Does not apply Off-street parking regulations ❑ Yes ❑ No /1 Does not apply Shared Parking n Yes Title 18 — Zoning 18.56 —Off-Street Parking & Loading @ 070.D, complementary parking is allowed (e.g. pharmacy within a hospital) that does not require additional parking spaces above those required for the principal use. This is supportive of LID principles and should be retained. 0 No Does not apply Parking I page 2 l \ / / \ t / L� sca " ping, Natwe Vegetation, and Street Landscaping • Gap Analysis n Sheet Discussion February 2016 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion, Notes on Team Discussion and Follow-up Status of Sub Topic Tree preservation n Yes Title 17 - Subdivisions 17.20.030 - General Standards @(A)(2) Every reasonable effort shall be made to preserve existing trees and vegetation. Keep language. This language is supportive. 11 No ❑ Does not apply Tree preservation ►1 Yes Title 18 - Zoning @ 080 — Vegetation Protection and @ B, in the Shoreline district, required to ❑ No 18.44 — Shorelines Landscaping, the purpose of protecting retain as many significant trees and native E Does not apply existing trees and native vegetation in the shoreline is given. A goal is to preserve as many trees as possible and increase native trees and shrubs. vegetation as possible during site development or re -development, even if planned locations of improvements need to be altered to accommodate the trees. Site planning requirements when trees are involved support tree retention and health by requiring an inventory and protection measures. This is an LID technique and should be retained. @ C(2) requires a planting plan for development in the River Buffer environment This is supportive of LID and is an example of language that could be used in Title 17 or elsewhere that site planning is discussed. @ 110 — Shoreline Design Guidelines, a requirement to clearly allocate space for improvements to preserve existing stands of vegetation or trees so that natural areas can be set aside, improved, or integrated into site organization and planning This language is supportive of LID principles. 18.54 Tree Regulations The purpose statement is supportive of Supportive xl �, l` LID, including statements that the "Tree Ordinance" is to mitigate some consequences of land development, promote building and site planning practices that are responsive to the Landscaping, Native Vegetation, and Street Landscaping I page 1 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic natural environment, and maintain benefits of vegetation, such as reduction of runoff and erosion. @ 050 activities requiring a Tree Clearing Permit are listed. This section appears to limit Tree Clearing Permit to trees within a sensitive area, buffer, or shoreline zone. Consider expanding this requirement to any tree to support retention of vegetation in accordance with LID principles. I Tree preservation r Yes IDCS 4.0.4 — Frontage Improvements, Item J.1 (page 4-3) Mandates that existing vegetation should be retained, or replanted, if disturbed during development when there are frontage improvements. Supportive /1 No Does not apply Tree preservation • Yes Comprehensive Plan Introduction — Pg. X Utilities — Pg. 12-17 @ Roles and Responsibilities — Emphasis on improved surface water management, i.e. land preserved for drainage, flooding and stormwater. @Policy 12.1.29 — Encourage tree retention and plantings for their benefits to surface water quality and quantity. Keep language. This language is supportive. Keep language. This language is supportive. Consider adding text to emphasize native conifer trees, whose ability to retain water is better than other species. 11 No ❑ Does not apply Screening /1 Yes Title 17 - Subdivisions 17.20.030 - General Standards @(B)(1) Where different zoning classes are adjacent and where a natural separation doesn't exist screening shall be provided. Consider emphasizing native vegetation use for screening through preservation or replanting in this section. ❑ No ❑ Does not apply Screening /1 Yes Title 18 - Zoning 18.52 — Landscape, Recreation, Recycling/Solid Waste Space Requirements Required screening types and depths are defined for all districts for front yard, side yard, and rear yard. Perimeter Landscape types are defined — In the table, at footnote 1, consider explicitly allowing LID features, especially bioretention, in the front yard landscaping of MDR and HDR, which already allow pedestrian and transit facilities under a Type 2 decision. In the table, at footnote 3, consider explicitly allowing bioretention to serve as required landscaping in RCC, TVS, and TSO districts. Allow bioretention in Types I and II E No (l Does not apply Landscaping, Native Vegetation, and Street Landscaping I page 2 Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic Types I (light screen) through III (extensive screen). screens. Allow dispersion in Type I screen, Landscaping n Yes Title 11— ROW Use Gives standards for maintenance of Appears conducive to LID. requirements for street frontages 12 No 11.20 — ROW Vegetation vegetation in the ROW. ❑ Does not apply Landscaping /1 Yes Title 18 - Zoning Minimum landscaping requirements for Consider explicitly allowing bioretention in requirements for street frontages Ti No ❑ Does not apply 18.12- medium density residential front, sides, and rear expressed in feet, but does not appear to specify a landscaping type. front, side, and rear landscaping. 18.20 — residential All setback areas must be landscaped Explicitly allow LID features in setbacks commercial with a mix of plants, pedestrian amenities, outdoor cafes and similar features subject to approval. also. 18.28 —Tukwila Urban @ 140(2)(i) encourages landscaped Supportive of LID in this district by Center District areas within the street ROW for new streets in the district to be functional stormwater treatment facilities allowing LID such as bioretention to meet landscaping requirements. @ 230 Landscaping is discussed in detail. @ B — Side and Rear Yard Landscape Types — consider specifically allowing LID to function as landscaping where only Groundcover is required and to substitute for the shrub and/or groundcover area when Moderate Screening is required. @240 General Landscaping criteria given @ 3 —gives requirements for soil preparation for trees and for all other plantings. Create a third category for bioretention used as landscaping/screening since the soil preparation should be in accordance with the design criteria for the BMP. @ (C)(2) General Landscaping Design, notes that "all landscaped areas should be designed to allow aquifer filtration and minimize stormwater run-off using bio- swales, filtration strips, and bio-retention ponds where appropriate." Unclear if this Landscaping, Native Vegetation, and Street Landscaping l page 3 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic provisions takes care of concerns from previous sub -sections of this section about allowing LID in landscaped areas. Landscaping requirements for street frontages // Yes Title 17 — Subdivisions 17.20.030 = General Standards @(G)(1) Each lot within a new subdivision or short plat of five lots or greater shall be landscaped with at least one tree in the front yard. Keep the language requiring a tree. Consider adding a requirement for native vegetation or allowing LID techniques such as raingardens to count toward the landscaping requirement. NINo Does not apply Landscaping requirements for street frontages ►1 Yes IDCS 4.0.4 — Frontage Improvements; Item D (page 4-1) 4.0.4 — Frontage Improvements, Item I (page 4-3) 4.2.6 — Right -of -Way Vegetation, (page 4-9) Lists several possibilities for street frontage improvements. Item 1.1 requires installation of "surface water drainage on all frontages" for SFR development. Describes requirements for new or replaced vegetation within the ROW. Consider incorporating language about LID strategies in this list. Could add language with preference for LID methods to handle surface water. Opportunity to add language promoting native or LID -friendly vegetation, particularly If bioretention will be encouraged in ROW. E No ❑ Does not apply Landscaping requirements for street frontages ❑ Yes Comprehensive Plan Community Image and Identity — Pg. 1-14 Natural Environment — Pg. 4-22 Natural Environment — Pg. 4-22 Southcenter — Tukwila's Urban Center — Pg. 10-10 @ Policy 1.7.4 — Incorporate substantial landscaping along street frontages and parking lots where there is room. @ Goal 4.12 — Take measures to promote, preserve, and enhance trees in Tukwila's urban landscape. @ Goal 4.13 — A comprehensive list of measures to increase overall citywide tree canopy to 29% by 2034. @ Goal 10.2.1— During review of projects promote use of indigenous Consider the addition of LID techniques such as rain gardens and native vegetation to this policy. Keep language. This language is supportive. Consider adding language to encourage the planting of native/conifer trees for their ability to intercept stormwater. This could be in addition to the heritage tree program mentioned in 4.12.9.1.Nk Keep language. This language is supportive. Consider adding language to encourage the planting of native/conifer trees for their ability to intercept 7// stormwater. Keep language. This language is supportive. Consider adding language Q- , likil—' /1 No U Does not apply Landscaping, Native Vegetation, and Street Landscaping I page 4 Topics Reviewed Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic plants, water -saving plants, and plants with wildlife habitat value. encouraging LID techniques such as bioretention and raingardens. Landscaping requirements for parking Tots /1 Yes ❑ No ❑ Does not apply Title 18 - Zoning 18.44 — Shorelines 18.28—Tukwila Urban Center District 18.52 Landscape, Recreation, Recycling/ Solid Waste Space Reqs. 18.56 — Off -Street Parking & Loading @ C(3) native trees and shrubs and groundcover are required in parking lot landscaping in the Shoreline district. @240 General Landscaping criteria given @ 035 interior parking lot landscaping requirements are given, indicating amount, location, distribution, and planting standards for landscaping in parking Tots. @ 070, Cooperative Parking, allows shared parking Tots to waive landscaping requirements on the common property line. Supportive. @ (B)(6) gives landscaping requirements for parking lots. Setback and perimeter landscaping is required for parking lots. Allow bioretention to serve or meet setback and perimeter landscaping requirements, except where a heavy screen is required. For interior parking lot landscaping, flexibility is given to integrate surface water management; this is supportive of LID and should be retained. Amounts seem conducive to integrating LID into parking lot landscaping. However, at 035.4, requires a landscaped area at the end of each Interior row. Minimum size of a landscaped island is 100 sf. With a minimum dimension of 6' in any one direction, landscape islands would be large enough to accommodate bioretention using the minimum dimension of the BMP (e.g. minimum 2' bottom width). Incentive to share parking is good. Can the landscaping requirement be moved and reduced instead of waived? (' .-' Y (` \A�5' `V i� I J� (S �' 1:9\\P b Landscaping requirements for parking Tots ❑ Yes Comprehensive Plan Natural Environment — Pg. 4-24 @ Goal 4.13.11— Evaluate current parking lot landscape requirements to identify opportunities to increase tree canopy. Keep language. This language is supportive. Consider adding language encouraging native conifer trees to increase water retention potential. 11 No ❑ Does not apply Landscaping requirements for cul- de -sacs /1 Yes Title 11— ROW Use 11.12.170 — Street Ends A landscaped island delineated by curbing is required in the center of each Allow this landscaped island to contain bioretention and serve the adjacent pavement. Ensure that water can enter through curb cuts or piped inlets. Consider whether thistitle t t t e is the appropriate O I ' V - X V''''Nf ❑ No n Does not apply cul-de-sac, t o maintained by an HOA or adjacent property owners. Landscaping, Native Vegetation, and Street Landscaping 1 page 5 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic location to require this. There may be a standard plan for a cul-de-sac or other/L appropriate location. �� � ��. �\ I Landscaping Site // Yes Title 18 - Zoning @ 040.B General Landscape and These guidelines should be harmonized Preparation ❑ No ❑ Does not apply 18.52 Landscape, Recreation, Recycling/ Solid Waste Space Reqs. Screening requirements, site preparation instructions are given, including tilling mulch to a depth of 18 Inches. with the KCSWDM requirements for soil moisture capacity preservation, since all landscaped areas will need to comply with that BMP. Landscaping ►1 Yes Title 18 - Zoning @ 050 Landscape Plan Requirements call This timing may not be adequate if Submittal ❑ No 18.52 Landscape, for submittals to be prepared by a landscaped areas are to be used for Requirements ❑ Does not apply Recreation, Recycling/ licensed landscape architect and allow bioretention, which must be reviewed Solid Waste Space Reqs. submittals prior to certificate of occupancy. with engineering plans. Consider requiting a landscape plan to be submitted earlier if the landscaped areas will contain bioretention. Additional Notes: Landscaping, Native Vegetation, and Street Landscaping I page 6 Design Guidelines and Standards. 1,11111,111,1111111, Anal` Gap sis`Discussion Sheet February 2016 Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic Trees and bioretention ►1 Yes All titles and documents Missing topic. Tukwila code does not appear to discuss a plant list or tree list suitable for bioretention anywhere. Opportunity to develop a list of plants appropriate for use in bioretention and in bioretention in the ROW to support use of these technologies. / [ No Does not apply Trees and bioretention /1 Yes Comprehensive Plan Community Image and Identity — Pg. 1-13 Southcenter-Tukwila's Urban Center — Pg. 10-12 @ Policy 1.6.2 — Develop streetscape design guidelines supporting pedestrian oriented amenities within urban and commercial areas: @ Policy 10.2.3 — Create regulations and design guidelines using physical and natural elements that enhance an area's overall aesthetic. Consider the addition of LID techniques to design guidelines. Consider adding text such as "and increase surface water quality" in order to encourage LID in new development. n No C Does not apply Continuous curb requirements ❑ Yes E No n Does not apply Title 17 — Subdivisions 17.20 — Design Standards for Land Division 17.20.030(6) — discusses curb requirements, referencing Public Works standards. Ensure that the Public Works standards allow for roads without curbs or with curb cuts when roadside dispersion and bioretention are used. Continuous curb requirementsNo Yes (IDcsfittki Did not find a discussion of this topic. Ensure that the Public Works standards allow for roads without curbs or with curb cuts when roadside dispersion and bioretention are used. n Does not apply Curb radii 11 Yes IOCS 4.2.3 — Street Intersections, p, 4-8 Directs user to Land Use Comprehensive Plan Transportation Element for curb radii. Discuss this further with City staff. ❑ No n Does not apply Building Design 11 Yes Title 18 — Zoning 18.50 Supplemental Design Standards `, @ 050 Single -Family dwelling design standards require single-family buildings to be set on a permanent foundation with the space from the bottom of the home to the ground enclosed by concrete or a concrete product, either load -bearing or decorative. This provision would restrict the use of minimum disturbance foundation systems, such as pin foundations, which also provide flow control credits by allowing runoff to sheet or travel in the upper soil strata below the building. This would limit the use of an allowed LID stormwater BMP ("Flow Control BMP") from the KCSWDM. ❑ No ❑ Does not apply • Additional Notes: Design Guidelines and StandardsI page 1 Hard and Impervious Surfaces Gap Analysis discussion Sheet February 2016 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion & Follow-up LrF Status of Sub Topic Maximum impervious surface allowances Yes Title 18 - Zoning 18.46 Planned Residential Development 18.50 Supplemental Development Standards @ 060.D Maximum impervious coverage for a PRD development in sites with sensitive areas is 50%. @ 085 the maximum percent development area coverage is given for MDR and HDR, and set at 50%, and allowing an increase to 75% for townhome developments if LID techniques are used. This is a little confusing since RDs are only allowed where there are sensitive areas.ig. g .'. We do not find a gap here. 1 IS No ❑ Does not apply 4:\,.\ \ Shared driveways ❑ Yes Comprehensive Plan Transportation — Pg. 13-10 @ Implementation Strategies — Develop methods top incentivize shared driveways. Keep language. This language is supportive. However, we did not find an incentive program. AI No ❑ Does not apply Minimum driveway width NII Yes All code titles and documents We did not find a discussion of this sub topic. Is there an opportunity to provide.- guidance on driveway width in order to discourage excessive hard and impervious surfaces? yy��� 5-v 37ff'Ob j ' �/ %%jj 8) u( n No ❑ Does not apply Use of permeable pavement for driveways & driveway encroachments G. Yes IDCS Topic is not discussed. May consider explicitly allowing permeable pavement driveways and providing a design detail or plan. n No n Does not apply Two -track driveway design N Yes E No ❑ Does not apply IDCS Topic is not discussed. This is not addressed in Tukwila's standards but will be allowed in the KCSWDM for a "Reduced Impervious Surface Credit". Called Wheel strip driveways in KCSWDM. Definitions E Yes mm. IDCS Appendix A Throughout the Infrastructure Design and Construction Standards are references to concrete pavement and asphalt pavement. Consider including a blanket statement that concrete pavement and asphalt pavement are construed to include the permeable versions of these surfaces, where allowed or required by the KCSWDM, unless explicitly prohibited. � ` (� { ( . 9( ` u \e/ . n No ❑ Does not apply Additional Notes: Hard and Impervious Surfaces I page 1 / II'II nnw vl'mv uRe . 1 ,!unn ,w , , ilw n', ap Analysis Discussion Initial Review Draft: Topics Reviewed Topic/Sub Topics February 2016 (aps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic Protecting existing infiltration I. Yes Title 17 - Subdivisions 1720.030 - General , Standards @(C)(1) Grading steep topography may be necessary to achieve the objective of an integrated system of Local streets. Consider including provisions for minimizing site disturbance and protective native vegetation and soils. n No Does not apply Protecting existing infiltration ❑ Yes Comprehensive Plan Introduction — Pg. X Natural Environment — Pg. 4-15 @ Roles and Responsibilities — Emphasis ' on improved surface water management, i.e. land preserved for drainage, flooding and stormwater. @ Policy 4.11.1— In geologically hazardous areas minimize disturbarce to vegetation and land. Keep language. This language is supportive. Keep language. This language is supportive. �� No n Does not apply Conserving native vegetation/soils a Yes Title 17 - Subdivisions 17.20.030 - General Standards @(C)(1) Grading steep topography may be necessary to achieve the objective of an integrated system of local streets. @(C)(4) Improved site development and circulation shall not be sacrificed to minimize the amount of cut and fill requirements. Mass grading of sites should be avoided to the greatest degree. Consider rewording this section to discourage grading steep topography, making it a last resort. Cut/fill should be minimized in order to conserve native vegetation and soils. It is encouraged to reword this section to enable flexibility between grading and circulation. 5q��� ❑ No ❑ Does not apply Conserving native vegetation/soils ❑ Yes Comprehensive Plan Introduction — Pg. X @ Roles and Responsibilities — Emphasis on improved surface water management, i.e. land preserved for drainage, flooding and stormwater. Keep language. This language is supportive. 12 No C Does not apply Construction sequencing ►1 Yes Title 17 - Subdivisions 17.24.020 — Process for installing public improvements Improvements installed shall conform to the requirements and specified procedures of this title and the Department of Public Works. Consider including proper construction sequencing as -a procedure to reduce the potential for soil erosion and compaction. n No ❑ Does not apply Construction sequencing H Yes Comprehensive Plan Natural Environment — Pg. 4-21 @ Goal 4.11— Minimize impacts to areas of potential geologic instability. Keep language. This language is supportive. Also consider adding a policy regarding proper construction sequencing to minimize impacts by reducing potential for soil erosion and compaction. /1 No ❑ Does not apply Additional Notes: Clearing and Grading 1 page 1 Bulk and Dimensional Considerations Gap Analysis Discussion Sheet Initial Review Draft: February 2016 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic Building setbacks /1 Yes ❑ No ❑ Does not apply Title 18 — Zoning Various sections 18.22 — neighborhood commercial center Setbacks are given in the various Chapters, 18.10 — low density residential, 18.12 — medium density residential, 18.14 — high density residential, etc. Note: we did not review setbacks for industrial and more intensive use zones. Recommend further discussion with City staff. Setbacks for HDR and Office seem to increase with Increased building height. Is that accurate? ,/�f, ,�%'� y C/ 16° \ Seiefil �}� AD° �p 1 I ''"1, ( 1 -. rri------1.---. Height limits 11 Yes (1 No ❑ Does not apply Title 18 -Zoning 18.46 Planned Residential Development @ 060.A building height may be modified to maintain significant vegetation and enhance views; commensurate decrease in impervious surface is required. This provision is supportive of LID, but can it be ex6anded outside of the PRD '�;�=,•,,ii 41:,I'i ( `�►j` / �l ^ ,� tN` �}✓' Maximum square footage ►1 Yes All codes titles and documents Topic not covered. Are there opportunities to encourage minimizing building footprints to make room for LID BMPs and retention of native vegetation? 1 XI W' E No ❑ Does not apply Clustering 11 Yes Title 17 - Subdivisions Clustering is not discussed as a subdivision technique. It may be more appropriate to contemplate this idea in Title 18 — Zoning. n No ❑ Does not apply Clustering Yes ❑ No ❑ Does not apply Title 18 — Zoning Definitions The definition of Planned Residential Development includes the idea that a PRD could include clustered housing, but otherwise clustering is not discussed. Could there be a more extensive discussion of clustering and specific parameters for encouraging clustering in new developments to protect permeable soils and native vegetation? / . .,('� J` L 'b vJ Clustering 1 Yes ❑ No ❑ Does not apply Comprehensive Plan Shorelines — Pg. 5-13 @ Policy 5.3.7 & 8 — Encourage efficient use of land through such techniques as clustering. Mixed -use alternatives, and hared use corridors. Keep language. This language is supportive. Consider adding LID to the use of techniques encouraged. arc_i_tlaLL ts? policy be extended to other districts? �---- —-----_._ _ Additional Notes: Bulk and Dimensional Considerations 1 page 1 He••Ithy S©ils • Gap Analysis y Discussion' Sheet February 2016 Topics Reviewed Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic Protecting and restoring healthy soil (continued below) a Yes Title 18 - Zoning 18.44 - Shorelines @ 070.J land altering activities are discussed in the shoreline district. Generally, land altering activity is only allowed to the minimum necessary to accomplish the allowed use. This language is supportive of LID; however there is no similar prohibition in other districts. f aid /T5 (' DeS 0(2-TL6' 60117g.1"tt E No ❑ Does not apply Protecting and restoring healthy soil (continued from above) ❑ Yes IDCS 5.6 — King County Surface Water Design Manual, Item B.1, (page 5-6 & 5-7) Section requests native topsoil/duff layer be retained to maximum extent practicable, or otherwise be amended or replaced with a material with an equivalent infiltration capacity to that of the existing ground. This may include adding organic matter to the soil. This language is supportive; however it is addressed in KCSWDM 2015 as part of Core Requirement #9, Flow Control BMPs, and is known as protecting the soil moisture holding capacity of new pervious surfaces. No conflict, but should defer to KCSWDM. No n Does not apply Protecting and restoring healthy soil (continued from above) ❑ Yes Comprehensive Plan Introduction — Pg. X @ Roles and Responsibilities — Emphasis on improved surface water management, i.e. land preserved for drainage, flooding and stormwater. Keep language. This language is supportive. ►1 No ❑ Does not apply Compost amendments ❑ Yes IDCS 5.6 — King County Surface Water Design Manual, g Item B.2, (page 5-7) Replaced topsoil is required to have 8- 13% organic matter content, and a suitablepH for proposed plantings. p p p g� Good language, but defer to KCSWDM's protection of soil moisture capacity. r �� V��,;,01ACx. ;1' � � /1 No Does not apply ❑ ppY Compaction /1 Yes ❑ No ❑ Does not apply IDCS Standard Details Compaction under roads and sidewalks is not addressed in the City's standard details. Avoidance of compaction under LID BMPs such as bioretention is not discussed or shown in standard details. Compaction under permeable pavement surfaces is generally required to be less than compaction under the analogous impermeable pavement surface. The Regional Porous Pavement Working Group has developed guideline specifications for subgrade preparation under permeable pavements. These recommend subgrade compaction of 90-92% standard proctor using ASTM D698 or to firm and unyielding. Include compaction instructions in a standard detail for permeable pavement, if included. No standard details for LID BMPs. If standard details for BMPs are included, show notes to avoid compaction. Healthy Soils I page 1 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap TeamDiscussion Notes on Team Discussion and Follow-up Status of Sub Topic 2.4.7 — Inspections, Item C This section discusses field inspection Recommend additional discussion with 5 < (page 2-18) requirements for public infrastructure, including inspection for compaction and grade of subgrade. g City staff. What standards for compaction are inspectors using, and where is it referenced? ` ^� Additional Notes: Healthy Soils 1 page 2 / Streets and Roads Gap Analysis Discussion Sheet February 2016 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Vim. Status of Sub Topic Travel lane widths /1 Yes Title 17 - Subdivisions 17.20.030 - General Standards @(C)(6)(a) widths for roadway pavement for various street types are given. For Access Road type and Cul-De-Sac road type, consider reducing paved width, currently at 28-36 feet for Access and 26 feet for cul-de-sac. Center for Watershed Protection recommends between 18'-22' of pavement width for residential streets with less than 500 ADT. ,,l l �rrp- e , jtA) r") J // � 5 �S ❑ No n Does not apply a)@!') s�i4 - 1 6' 0 Travel lane widths 11 Yes IDCS Public street dimensions described Consider whether minimum travel lane Lj No 4.2 — Public Streets, (page based on roadway type and Standard widths can be reduced to the minimum ❑ Does not apply 4-7) and Standard Detail RS-01 Detail RS-01. • required by emergency responders, particularly for local access streets or 9i) f a'6 those with no housin•/buildings or anticipated on -street parking. For public streets, current min. paved width = 28' residentiaLand 36' commercial. For private streets, current min. paved width = 20' residential, and 28' commercial. Center for Watershed Protection recommends between 18'-22' (of pavement width) for residential streets with Tess than 500 ADT. Costs: Considering that the cost of paving a road averages $15 per square yard, shaving even a mere four feet from existing street widths can yield cost savings of more than $35,000 per mile of residential street. In addition, since narrower streets produce less impervious cover and runoff, additional savings can be realized in the reduced size and cost of downstream stormwater management facilities. (Better Site Design Fact Sheet: Narrower Residential Streets, SMRC) Streets and Roads 1 page 1 Topics Reviewed Qaps and opportunities Identified Tonic/Sub Tonics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic 4.2,5 = Access, Item B (page 4-8) Discusses minimum lengths and widths for pavement for access lanes, Consider whether minimum access lane width can be reduced to the minimum required by emergency responders. Right-of-way (ROW) widths 1 Yes Title 17 - Subdivisions 17.20.030 - General Standards _ @(C)(1) Proposed street systems shall extend existing streets at the same or greater width. @(C)(6)(a) ROW and roadway pavement widths @(C)(6)(b)(1) Cul-de-sacs are not allowed unless there is no reasonable alternative? Recommendation for LID is to reduce ROW width, not increase, in an effort to reduce impervious surface. Consider revising width requirement. Keep language stating minimum widths shall be used unless City Engineer demonstrates a wider width is needed. If Access Road type and CuI-De-Sac roadN type pavement widths are reduced, consider a commensurate reduction in ROW width. Keep language. This language is . supportive since cul-de-sacs consume a lot of area. //TT 1 ❑ No ❑ Does not apply Right-of-way (ROW) widths 112 Yes IDCS 4.0.11— Non -Motorized Facilities, Item A.2, (page 4-4) Sidewalks required on one or both sides of street, depending on street designation or length. Opportunity to adjust length requirements/ for sidewalk to be on one vs. both sides of streets. ' 0 f ` ' E \ et,,,,,,„,/, (1 No n Does not apply Use of permeable pavement for streets and roads A Yes Title 11— ROW Use 11.12.120 — Private Streets One condition required for allowing a private street is that the owners will record a covenant for maintenance and repair. Adequate maintenance of permeable pavements may be beyond the ability of private owners. n No ❑ Does not apply Use of permeable pavement for streets and roads AI Yes Title 17 - Subdivisions 17.20.030 - General Standards @(C) General guidance to street extension, names, intersection, and layout.ncor\i(j @(C)(5) Requirements for private road authorization @(C)(6)(c) Full width improvement of ROW for new developments. Consider mentioning the use of pervious materials where feasible. Could add language encouraging or requiring permeable pavement on private roads. Could add language encouraging the use of LID techniques. ,Q� �, " jU U / Q/ � ❑ No ❑ Does not apply Use of permeable pavement for streets and roads I Yes IDCS 4.2.5 —Access, Item B (page 4-8) Discusses the required paved street surface for access lanes. Consider whether this access lane qualifies as "low volume/low load" as required for permeable pavements, and if so, can the text be revised to suggest using permeable ❑ No ❑ Does not apply Streets and Roads I page 2 Topics Reviewed Gaps and Opportunities Identified Teamr)isrussinn Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic pavements for access lanes. Placement of utilities i under paved areas in the ROW /1 Yes IDCS 4.2.4 — Underground Utilities, (page 4-5) 4.3.1— General Illumination, Item D,(page 4-9) 7.2 — Water Main, (page 4- 9) Discusses that certain new utilities shall always be buried underground, and those within the same ROW corridor shall be buried in a joint trench wherever possible. Requires all new or relocated illumination conduit, wiring, etc. to be underground. N/A Opportunity to add language about preference for buried utilities to be located under the paved section of ROW (less conflict for future roadside LID installation). Opportunity to add language about preference for buried utilities to be located under the paved section of ROW. Opportunity to add language about preference for buried water mains to be located under the paved section of ROW. No Does not apply Required turn around area (e.g., Fire, USPS) ►1 Yes All code titles and documents \1 �� IC9 ' IW We did not find a discussion of this sub- topic. Is there an opportunity to provide guidelines for required turnaround for public safety and service vehicles that can minimize area lost to impervious and hard surfaces? ❑ No ❑ Does not apply Sidewalk widths Z Yes n No ❑ Does not apply Title 17 - Subdivisions 17.20.030 - General Standards C 5^` ' 2 Sidewalk right-of-way t-of-wa or easements at a minimum width as specified in Chapter 11.12 shall be provided. Recommend discussing with City staff. We did not find mention in Title 11. Sidewalk widths a Yes IDCS and Title 11 Sidewalk width does not appear to be addressed in the standards. Should they be? ❑ No n Does not apply Sidewalk slope a Yes IDCS 4.0.11— Non -Motorized Facilities, Item A, (page 4- 4) N/A Consider adding language encouraging sidewalk cross slope directed toward LID BMPs or native vegetation instead of roadway, where possible. No n Does not apply Use of permeable pavement for sidewalks /1 Yes Title 11— ROW Use 11.12.150 — Nonmotorized Facilities Requires concrete sidewalks on both sides of arterials and on non -arterials longer than 200 feet in length. Could consider allowing sidewalks only on one side, to reduce impervious and hard surfaces, on streets designed for LID, as long as adequate circulation is otherwise provided. ❑ No ❑ Does not apply Use of permeable pavement for sidewalks /1 Yes IDCS 4.0.11— Non -Motorized Facilities, Item A.3, (page 4-5) Lists circumstances where a material other than concrete can be used as sidewalk pavement. Specifies bikeway and walkway Consider revising to use language that instead encourages or incentivizes permeable pavements in lieu of concrete. Or suggests circumstances where using permeable pavements would be ideal. Suggestion to encourage/incentivize n No ❑ Does not apply Streets and Roads 1 page 3 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up t�11>s�F Status of Sub Topic 4.0.11— Non -Motorized Facilities, Item B, (page 4- 5) pavement requirements — only asphalt concrete. permeable pavement use over asphalt concrete pavement. Use of permeable pavement for sidewalks ►.�� Yes n No I I Does not apply Comprehensive Plan Transportation — Pg. 13-8 to 9 @ Policy 13.2.x — Policies toward road design that promote increased circulation, safety, and environmental considerations. Consider adding a policy regarding the use of permeable pavement to increase surface water infiltration where appropriate. Minimum cul-de-sac radius M Yes ❑ No ❑ Does not apply Title 17 - Subdivisions 17.20.030 - General Standards @(C)(6) The table in this section requires cul-de-sac turnarounds to have a diameter of 92ft in the ROW with 81ft of this being roadway pavement. Is this the minimum street section necessary for safe access and emergency response being used? Required turnaround area can conflict with minimizing impervious surfaces. Recommended turnaround sizes from the James River Associates are as follows: A minimum radius of 45 feet, measured to the edge of pavement or face of curb, shall be used for circular turnarounds on residential cul-de-sac streets serving more than 25 dwellings and greater than 0.25 mile in length. A 45 foot radius should also be used If standard 65 passenger school buses are expected to use the cul de sac, or for any nonresidential use. For circular turnarounds on short low volume residential cul-de-sac streets, this minimum radius may be reduced to 30 feet when specifically approved by the locality in consultation with emergency services. Minimum cul-de-sac radius /1 Yes ❑ No ❑ Does not apply IDCS 4.0.6— Dead End Street (page 4-3) New dead -ends are not allowed without justification. If justified, the cul-de-sac must not exceed the maximum length and must have a landscaped island. Revise text to include information about minimum cul-de sac -radius (per Fig. 4.1 in Subtopic document). Could also provide language requiring the landscaped island to be bioretention, unless infeasible. Alternatives to cul-de- sacs ❑ Yes ❑ No Title 11— ROW Use 11.12.170 — Street Ends Allows a hammerhead alternative to cul- de -sacs for streets Tess than 200 feet serving Tess than seven lots. This language is supportive. a Does not apply Alternatives to cul-de- sacs /1 Yes Title 17 - Subdivisions No alternatives to cul-de-sacs are discussed. Cul-de-sacs use more hard surface than an alternative such as a hammerhead. Consider whether a hammerhead turnaround can be encouraged or allowed in some cases. ❑ No I noes not apply Streets and Roads I page 4 / Topics Reviewed Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-u Status of Sub Tonic Alternatives to cul-de- sacs Yes ❑ No ❑ Does not apply IDCS 4.0.6 — Dead End Street (page 4-3) RS-02: Cul de sac & Hammerhead Hammerheads are allowed with a maximum road length and lot number Gives existing dimensions/requirements for cul-de-sacs and hammerhead dead- end turn arounds. Hammerhead is a good alternative to a cul-de-sac because its paved area is smaller. Opportunity to encourage cul-de sac alternatives and reduce overall impervious area by allowing hammerheads in more circumstances. Consider revisiting and revising some of these dimensions/standards to be more LID -friendly. Comparison between current requirements and LID concepts shown below: Tukwila PWE LID Subtopics Cul de sac w/ landscape island, Edge of Pvmt/Face of Curb Min. 40.5' radius 35' radius Cul de sac w/o landscape island, Edge of Pvmt/Face of Curb N/A, island req'd 30' radius Landscaped island Max. 10' radius Not listed (ass. 15' max radius) Hammerhead dimensions Min. 150'L x 20'W 60'L x 20'W Alternatives to cul-de- sacs E Yes Comprehensive Plan Transportation — Pg. 13-8 @ Policy 13.2.2 — Prioritize residential local access through -streets, minimizing cul-de-sacs. Keep language. This supportive. language is /�' /1 �„ / OV � ovil v�6 ( . ►1 No n Does not apply Additional Notes: Streets and Roads I page 5 Site Planning & Assessment Gap Analysis Discussion Sheet February 2016 -topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up AttlAk Status of Sub Topic Building locations Yes ❑ No ►1 Does not apply Parking area locations n Yes No 1 Does not apply Stormwater treatment/flow control BMP/facility locations (continued below) Yes IDCS 5.1— Offsite Drainage Improvements (page 5-1) Applicants may provide offsite improvements within a given basin to mitigate water quality and/or flow control requirements for a given project. Could add language suggesting a preference for stormwater to be mitigated on site if possible. n No ❑ Does not apply Stormwater treatment/flow control BMP/facility locations (continued from above) Yes Comprehensive Plan Natural Environment — Pg. 4-13 Natural Environment — Pg. 4-15 Parks, Recreation and Open Space — Pg. 6-11 Utilities — Pg. 12-16 Transportation — Pg. 13-7 @ Policy 4.1.5 — Develop and implement programs encouraging such things as Low impact Development (LID) techniques. @ Policy 4.5.3 — Develop BMPs for surface water drainage and street maintenance to avoid disturbing native riparian vegetation. @ Policy 6.2.1— The City's open space network will provide or have the potential to provide stormwater detention, water quality enhancement, and urban forest preservation. @ Policy 12.1.25 — Require on -site detention for both development and redevelopment projects, unless another viable option exists. @ Policy 13.1.5 — Incorporate features such as natural drainage and native plantings into the design of transportation facilities Keep language. This language is supportive. Keep language. This language is supportive. Consider adding LID as a primary BMP. Keep language. This language is supportive. Keep language. This language is supportive. Keep language. This language is supportive. Consider adding language encouraging stormwater infiltration: 1 No n Does not apply Site Planning & Assessment I page 1 / Topics Rcvicwed Topic/Sub Topics baps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic Site Planning Procedures 12 Yes Title 17 — Subdivisions & Plats 17.12 — Detailed Procedures for Short Subdivisions, 17.14 — Detailed Procedures for Subdivisions, 17.16 — Detailed Procedures for BSIP For preliminary approval, site planning is required that includes a number of items such as survey, proposed property lines, sensitive areas, trees, and proposed buildings and public improvements. Generally, an LID -based view of site design would include more emphasis on retaining areas of native vegetation and areas of permeable soils before locating improvements, buildings, and lot lines. See LID Technical Guidance Manual page 17 and section 2.3 through 2.10 for types of assessments that could be required for preliminary site planning. n No n Does not apply Low Impact Development a Yes Title 14 — Waters & Sewers 14.30.130 —Exceptions @ (B) this section grants some such as street standard and Allowing impervious surface reductions 1��� (� .CD EN:esnot apply support LID as the commonly used Commun vef ent standards, such as parking and landscaping. These require approval from the Community method of site development." Consider incentivizing these measures or removing the requirement to obtain an exception. 1�Z�' I �� / I, %�� ►'" . / V j 6r,/ t /J ,(, Development director. Street Network Yes E No C Does not apply IDCS 4.2.2 —Alignment and Connections, p. 4-7 Encourages alignments to relate to natural topography and discourages excessive grading and excessive runoff. This is supportive of LID. Additional Notes: Site Planning & Assessment page 2 Subdivision and Planned Unit Development (PUD) Gap Analysis Discussion Sheet February 2016 Topics Reviewed Topic/Sub Topics Gaps and Opportunities Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap ITeam Discussion Notes on Team Qiscussion and Follow-up Status of Sub Topic Individual open space requirements /1 Yes Title 17 - Subdivision Did not find a discussion of open space requirements on all subdivisions of land. Recommend additional discussion with staff. Is that accurate? 1 r'� C m` 17) e' ' ❑ No ❑ Does not apply Individual open space requirements /1 Yes Title 18 — Zoning 18.46 Planned Residential Development �� � @ 080.A describes open space requirements of at least 20% of the site with either passive or active recreation concentrated in large usable areas, trail connections to adjacent trails/open space (if feasible). @ 080.B sensitive areas and buffers are required to be set aside and this exempts the project from the other open space requirements. This table shows minimum open space and and required type for seven different uses in three different districts. Recommend requiring at least some percentage of the open space to be managed in a natural condition and requiring at least 80% of the open space to be divided between no more than 2 non - contiguous areas (i.e. consolidated not just for recreation). This provision is confusing and may seem to exempt all PRDs from the above open space requirement because PRDs appear only to be allowed when a sensitive area is on the site. Recommend further discussion with staff. ❑ No ❑ Does not apply UTable /c\" 18-4 Provis urn, f Bpi. Passive vs. active open space requirements Yes Title 18 — Zoning 18.46 Planned Residential Development 18.52 Landscape, Recreation, Recycling/ Solid Waste Space Reqs. @ 060.E Allows sensitive areas and stands of significant trees to serve toward meeting recreation space minimums if passive recreation such as trails, scenic viewing, and picnic opportunities can be demonstrated. @ 060 Recreation Space Requirements describes requirements for multi -family housing within MDR and HDR zoning districts. This language is supportive of LID but could be strengthened by ensuring that all passive recreation is constructed of permeable surfaces. The relationship between these requirements and the open space requirements within the PRD could be clarified. Could a portion of the required minimum of recreation area to be uncovered (50% generally and 80% maximum for senior ..IttLGll housing) be required to be maintained in a natural state of preserved native vegetation? ,.,``7 r J\ V � / 5 �. ❑ No ❑ Does not apply Subdivision and Planned Unit Development I page 1 i \/ Topics Reviewed Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion, Notes on Team Discussion and Follow-up Status of Sub Topic Providing a credit to reduce outdoor uncovered recreation area in exchange for extensively improved indoor recreation (e.g. weight room) and swimming pool + deck area, is not recommended to promote LID as this credit promotes provision of impervious surfaces over outdoor impervious surfacesfnsider some other kind of incentive for these amenities that does not decrease the required oufdaos recreation_spacce_.. General PRD Yes Title 18 — Zoning @ 010 The purpose statement Consider adding "permeable soils" to the n No n Does not apply 18.46 Planned Residential Development encourages use of PUD for retaining topography, vegetation, water -ways, wetlands, and views. list of items to be retained. @ 020 Permitted Districts permits use of PUD only where there are wetlands, watercourses and associated buffers. The permissions do not match the list of natural features to be retained, and should be made more permissive to plan around native vegetation and permeable soils if this chapter is to serve as the primary site planning guidance for LID projects. @ 110 Application procedure appears to require additional steps and cost for a PRD, for example, requiring an application for a rezone for proposed densities. To encourage creative site planning and LID site planning, make this the default, or easier option. Consider waiving a rezone application and fee for proposed densities as long as no exception or variance has been requested for the open space standards. Consider requiring the following provision for every residential subdivision, even those that are not PRDs: t i, every reasonable effort shall be made to preserve existing trees and vegetation and integrated them into the subdivision's design by preparing a tree inventory and a tree and vegetation retention and removal plan. Additional Notes: Subdivision and Planned Unit Development I page 2 Stormwater Management and Maintenance February 2016 Topics Reviewed I Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Gap Analysis Discussion Sheet Notes on Team Discussion & Follow-up Status of Sub Topic Maintenance Provisions ❑ Yes Title 14— Waters & Sewers Maintenance provisions are accounted for by adopting the KCSWDM, which includes maintenance and requirements for covenants/easements. 11 No ❑ Does not apply Inspection Access (covenants, easements) Yes Title 14 — Waters & Sewers Maintenance provisions are accounted for by adopting the KCSWDM, which includes maintenance and requirements for covenants/easements. A No ❑ Does not apply Inspection Access (covenants, easements) Yes a No Li Does not apply Comprehensive Plan Natural Environment — Pg. 4-18 @ Policy 4.8.3 — Perform inspection programs to ensure proper maintenance of surface water management systems. Keep language. This language is supportive. Consider encouraging covenant and easement agreements to guarantee access for inspection and maintenance. Enforcement /1 Yes Title 9 — Vehicles & Traffic 9.50.040 - General Standards @(1) - Regarding test criteria for concurrency, the water quality and detention standards described in the 1998 King County Surface Water Design Manual must be met. Consider updating this section to reference the standards described in the new 2016 King County Surface Water Design Manual - http://www.kingcountv.gov/environment/ ❑ No ❑ Does not apply water-and- land/stormwater/documents/surface- water-design-manual.aspx Enforcement ❑ Yes IDCS 5.6 — King County Surface Water Design Manual, Item A.5, (page 5-6) Part (a) states that maintenance procedures for surface water facilities on private property are the owner's responsibility. OK. No ❑ Does not apply Additional Notes: Stormwater Management and Maintenance I page 1 Critical Areas & Shoreline Management Gap Analysis Discussion Sheet February 2016 Topics Reviewed Topic/Sub Topics Gaps and Opportunitie s Identified Conflict/Gap Identified Section/Page Reference Summary of Existing Text Summary of Conflict/Gap Team Discussion Notes on Team Discussion and Follow-up Status of Sub Topic Allowance of LID ►1 Yes Title 18 — Zoning The chapter discusses designation or Recommend additional discussion with BMPs in critical ❑ No 18.44 — Shoreline Overlay shorelines, permitted uses, and Carol Lumb on this topic. areas/shorelines when compatible ❑ Does not apply District ? development standards. @ 050.B, regional detention vested before effective date of program allowed in �: 1\10OHWM Urban Conservancy Environmental Buffer. Urban Conservancyis a buffer 100' from for non -leveed banks and 125' Lei from OHWM for leveed banks. Also allowed @ 060.B within High Intensity Environment Buffer. No mention of LID facilities. Our analysis may be different if the stormwater system is considered an "essential public facility", as these are allowed in the various shoreline buffers. @ 070.D, Development Standards, Surface Water and Water Quality, use of LID techniques is required in the shoreline overlay district, unless infeasible; however, this does not specify whether LID BMPs are allowed in the various shoreline buffers. @090 — Sensitive Areas within Shoreline, requirements for site investigations, including feasibility of use of infiltration, are required. This is supportive of LID. Buffers for sensitive areas appear to exclude structures, but not no address LID BMPs. 18.45 — Sensitive Areas @ 070(B) allows new surface water discharges to sensitive areas or their buffers from various surface water management structures if water quality Consider allowing lined bioretention in wetland and watercourse buffers for water quality treatment, although these will not meet Core Requirement #9: Flow Critical Areas & Shoreline Management I page 1 Topics Reviewed Gaps and Opportunities Identified Topic/Sub Topics Conflict/Gap Identified Section/Page Reference Summary of E isting Text Summary of Conflict/Gap Notes on Team Discussion and Follow-up Status of Sub Topic r standards are met and flow does not adversely affect water level fluctuations, habitat, or flow rate. However, only bioswales and dispersion outfalls are Control BMPs in the KCSWDM. 1 allowed in wetland or watercourse buffers. Allowance of LID BMPs in critical areas/shorelines when compatible ►1 Yes ❑ No n Does not apply IDCS 6.3 — [Flood Zone] Critical Facility (page 6-7) Stipulates minimum requirements for critical facilities set within flood hazard areas. Explore LID BMPs that could work in this flood zone/not be negatively impacted by fluctuating floodwaters, and discuss siting those BMPs in this portion of the code. Allowance of LID BMPs in critical areas/shorelines when compatible M Yes No Does not apply Comprehensive Plan Shorelines — Pg. 5-6 Shorelines — Pg. 5-12 Shorelines — Pg. 5-20 Tukwila South — Pg. 9-7 @ Policy 5.1.1 through 5.1.3 — In the shoreline environments several steps should be taken to maintain and improve shoreline habitat and general shoreline protection. @ Policy 5.3.1— Implement shoreline guidelines to encourage river views, multiple uses, and encourage native vegetation. @ Policy 5.7.1— Design and locate transportation within shoreline area to be compatible with vegetation and habitat features. @ Policy 9.1.6 — Ensure development in Tukwila South is in accordance with the Sensitive Area. Consider adding language encouraging the use of LID in the bulleted items covering development and redevelopment within shoreline areas. If designed and maintained properly, LID facilities located within or adjacent to shorelines can have a positive impact. Keep language. This language is supportive. Consider adding language encouraging the use of LID techniques with development. Keep language. This language is supportive. Consider adding language encouraging the use of LID techniques to increase infiltration, benefiting vegetation and habitat Keep language. This language is supportive. Consider adding language encouraging the use of LID techniques to increase infiltration, benefiting vegetation and habitat. Additional Notes: Critical Areas & Shoreline Management 1 page 2 LID REQUIREMENTS SITE APN: ISSUED DNS PARENT PROJECT NO: PL16-0037 PROJECT NO: E16-0008 City of Tukwila Jim Haggerton., Mayor Department of Community Development Jack Pace, Director DETERMINATION OF NON -SIGNIFICANCE (DNS) File Number: E16-0008 Applied: August 15, 2016 Issue Date: September 19, 2016 Applicant: City of Tukwila Lead Agency: City of Tukwila Description of Proposal: Amendments to the Tukwila Municipal Code (TMC) and the City's Infrastructure Design and Construction Standards Manual updating references to the King County Surface Water Design Manual and other changes to implement low impact development standards and guidelines for drainage review and the design of development projects. Location: City-wide non -project action This notice is to confirm the decision reached by Tukwila's SEPA Official to issue a Determination of Non - significance (DNS) for the above project based on the environmental checklist and the underlying legislative and administrative proposal. The City has determined that the proposal does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under the State Environmental Policy Act (RCW 43.21c.030(2) (c).) This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. Project materials including the application, any staff reports, and other studies related to the proposal are available Monday through Friday 8:30 a.m. - 5:00 p.m. for inspection at Tukwila Department of Community Development 6300 Southcenter Blvd., Suite 100, Tukwila, WA 98188. The project planner is Moira Carr Bradshaw, who may be contacted at (206) 431-3651 for further information. This DNS is issued under the SEPA Rules on Determinations of Non -significance (WAC 197-11-340(2).) Comments must be submitted by October 3, 2016. The lead agency will not act on this proposal for 14 days from the date below. Jack PacIResponsible Official City of Tu wila 6300 Southcenter Blvd. Tukwila, WA 98188 (206) 431-3670 ))j)3s)6 Date The decision is appealable to the Superior Court pursuant to the Judicial Review of Land Use Decisions, Revised Code of Washington (RCW 36.70C). Any appeal shall be linked to a specific governmental action. The State Environmental Policy Act is not intended to create a cause of action unrelated to a specific governmental action. Appeals of environmental determinations shall be commenced within the time period to appeal the governmental action that is subject to environmental review. (RCW 43.21C.075) Copy: Greg Villanueva, for City of Tukwila Kimberly Wells, Puget Soundkeeper Alliance Tukwila Historical Society Peggy Van leperen Mike and Anne V 6300 Southcenter Boulevard, Suite #100 • Tukwila. Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 / Emily Zisette ✓ Brooke Alford Department of Commerce V State Department of Ecology, SEPA Division '7 King County Assessor Page 2 of 2 l \ City of Tukwila Department of Community Development File Number E16-0008 LAND USE PERMIT ROUTING FORM TO: fl Building Planning Public Works Fire Dept. Police Dept. Parks/Rec Project: Amendments to the Tukwila Municipal Code to implment the new King County Surface Water Design Manual and related regulations for drainage review and design of development projects. Address: City wide Date transmitted: August 18, 2016 Response requested by: August 29, 2016 Staff coordinator: Moira Date response received: REVIEWERS: Please specify how the attached plans conflict with your ADOPTED development regulations, including citations. Be specific in describing the types of changes you want made to the plans. When referencing codes, please identify the actual requirement and plan change needed. The Planning Division review does not supplant each department's ability to administer its own regulations and permits. However, project consistency at the Planning review stage is important to minimize significant later design changes. More than minimal design changes require further Planning Commission review, even if alteration is required to satisfy a City requirement. This further review is typically a minimum 60-day process. Requirements based on SEPA (e.g., not required by an adopted development regulation) MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the method used to calculate the mitigation required. Calculations of project impacts and the mitigation required (e.g., water capacity, road level of service analyses, or turning analyses) may be required of the applicant. COMMENTS (Attach additional comment sheets and/or support materials as needed.) Plan check date: Comments Update date: prepared by: r1 Tukwila Proposed Amended IDCS Standard Details Draft, August 5, 2016 401114, Page 58 PATH: K:\project\32600\J2634\CAW\ACAD\Owg\CAD Detads_TreeSoiNolumextwg PLOT DATE 7/15/16 irvatiradsa11 CLOSED SOIL VOLUME (UNDER SIDEWALK) 4' 0" 10 1 15'-0" RIGHT OF WAY OPEN SOIL VOLUME 4'X4' MINIMUM TREE CUT OUT 4' X 4' % S ux O9EREO SOIL biXeX3ictitn. ploch ar /anted; N ice ",'COYERED SOIL 1* NICCR sarw4 VERTICAL CURB STREET �ffi�3 areet_kA odd ea- 3 X Athliok 'Mt -fre-es rod1ooi/ CenifaLi-sU/i i'en'f( 5•uch If641j4hoYs(ftte e.')roo -I.7 la shoulof vemarh a6r�VLY L.ser1 ?eV L TOTAL SOIL VOLUME CALCULATION FOR TYPICAL STREET TREE: OPEN SOIL VOLUME = 4' X 4' X 3' = 48 CUBIC FEET CLOSEDZSOIL VOLUME = 24' X 10' X 3' = 720 CUBIC FEET SSfru c raJ) ? TOTAL SOIL VOLUME = 768 CUBIC FEET (750 C.F. MIN. REQUIRED) NOT TO SCALE City of Tukwila SOIL VOLUME CALCULATION, TYP. STREET TREE SHEET: TBD REVISION #1: LAST REVISION: APPROVAL: n • Tukwila Proposed Amended IL, cnd Standard Details Draft, August 5, 2016 Page 58 vs a awycA- skodl oor ,AIA w 15-0' MOT Of WAY CLOSED SOIL VOLUME (UNDER SIDEWALK) 3'-0" MIN. DEPTH auf 10'- 15'-0" RIGHT of WA OPEN SOIL VOLUME 4'X4' MINIMUM TREE CUT OUT (moss -WOO Nor suit witulIS�G so detp— ar . vows r•, LA n-pc 4 pinYeb. SD Hi�' � uJ�� TOTAL SOIL VOLUME CALCULATION FOR TYPICAL STREET TREE: Stnic t +us, f'v*.‘' roor - - Wu.4 OPEN SOIL VOLUME = 4' X 4' X 3' = 48 CUBIC FEET 10,1.40) Sosi J ua. CLOSED SOIL VOLUME 24' X 10' X 3' = 720 CUBIC FEET awl wr about tr. Sire tra.1(7) TOTAL SOIL VOLUME = 768 CUBIC FEET (750 C.F. MIN. REQUIRED) `t X 4. X 3' OKOVIRED 508. .5r16. ..144147614t-.• 4' X 10' XI' OVERD sox. Ak , ACCIOvr MEV TREE VERTICAL CURB STREET 3 X ✓itc- NOT TO SCALE XWI L Oy 1908 City of Tukwila SOIL VOLUME CALCULATION, TYP. STREET TREE dhmal.5,0-ris SHEET: TBD REVISION #1: LAST REVISION: APPROVAL: I 7 RECEIVED City of Tukwila Department of Community Development AUG 18 2016 File Number E16-0008 TUKWILA LAND USE PERMIT��U�atiNG FORM TO: E' Building Io, Planning Public Works Fire Dept. Police Dept. Parks/Rec Project: Amendments to the Tukwila Municipal Code to implment the new King County Surface Water Design Manual and related regulations for drainage review and design of development projects. Address: City wide Date transmitted: August 18, 2016 Response requested by: August 31, 2016 Staff coordinator: Moira Date response received: REVIEWERS: Please specify how the attached plans conflict with your ADOPTED development regulations, including citations. Be specific in describing the types of changes you want made to the plans. When referencing codes, please identify the actual requirement and plan change needed. The Planning Division review does not supplant each department's ability to administer its own regulations and permits. However, project consistency at the Planning review stage is important to minimize significant later design changes. More than minimal design changes require further Planning Commission review, even if alteration is required to satisfy a City requirement. This further review is typically a minimum 60-day process. Requirements based on SEPA (e.g., not required by an adopted development regulation) MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the method used to calculate the mitigation required. Calculations of project impacts and the mitigation required (e.g., water capacity, road level of service analyses, or turning analyses) may be required of the applicant. COMMENTS (Attach additional comment sheets and/or support materials as needed.) The environmental checklist should be revised to include the following comment: B. Environmental Elements 5. Animals c. This area is part of the Pacific Flyway. A primary corridor for migratory bird species. °kW S/ath Plan check date: Comments Update date: prepared by: CITY OF TUKWILA Department of Community Deve 6300 Southcenter Boulevard, Ste 100 Tukwila, WA 98188 Telephone: (206) 431-3670 7 \ efrx AUS lig 2016 Community Development SEPA VIRONMENTAL REVIEW APPLICATION FOR STAFF USE ONLY Permits Plus TYPE: P-SEPA Planner: File Number: O(.4s./Application /--- / 6 _ Complete Date: Project File Number:pz___ /z�(�.�, Application Incomplete Date: Other File Numbers: NAME OF PROJECT/DEVELOPMENT: Adopt Low Impact Development Requirements BRIEF DESCRIPTION OF SCOPE OF WORK: Revise and make effective in the City's codes, rules, and standards to incorporate Low Impact Development (LID) principles and LID Best Management Practices (BMPs). This application requires public notice. Please see section 7 of the application checklist. LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and subdivision, access street, and nearest intersection. City wide. LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement). City wide. DEVELOPMENT COORDINATOR/ PROJECT CONTACT: The individual who: • has decision making authority on behalf of the owner/applicant in meetings with City staff, • has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards, and • is the primary contact with the City to whom all notices and reports will be sent. • PLEASE PRINT CLEARL Y Name: Greg Villanueva, City of Tukwila Public Works Department Address: 6300 Southcenter Blvd. Suite 100 CITY, ST, ZIP Tukwila, WA, 98188 Phone: (206) 431-2442 E-mail: greg.villanueva@tukwilawa.gov Signature: V-40..AktkAftt.. • Date: August 11, 2016 \tcitystore\City Common\Teri - DCD\Kirby\SEPA to fix\SEPA Environmental Review Application FINAL 5-9-16.docx City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director Notice of Complete Application August 18, 2016 Greg Villanueva Department of Public Works City of Tukwila 6300 Southcenter BL Tukwila, WA 98188 Subject: Storm and surface water regulations that incorporate low impact development standards in compliance with State and Federal regulations. SEPA File #: E16-0008 Dear Greg, Your State Environmental Policy Act (SEPA) checklist is considered complete on August 18, 2016 for the purposes of meeting state mandated time requirements. This determination of complete application does not preclude the ability of the City to require that you submit additional plans or information, if in our estimation such information is necessary to ensure the SEPA review meets the substantive requirements of the City or to complete the review process. This notice of complete application applies only to the SEPA decision on the proposed legislative action to amend City regulations. The legislative action will implement the new King County Surface Water Design Manual and related Tukwila Municipal Code (TMC) standards. It is your responsibility to apply for and obtain all necessary permits issued by other agencies. Please feel free to contact me with any questions at (206) 431-3670. Sincerely, l Moira Bradshaw Senior Planner Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov r-, City of Tukwila Endangered Species Act Screening Checklist Date: August 15, 2016 Applicant Name: Greg Villanueva Department of Public Works City of Tukwila Street Address: 6300 Southcenter Blvd. Suite 100 City, State, Zip: Tukwila, WA 98188 Telephone: 206-431-2442 DIRECTIONS: rA AUG 15 2016 Community Development This Screening Checklist has been designed to evaluate the potential for your project to result in adverse effects to salmonids - Chinook, Coho, Cutthroat trout or char - as defined by Section 9 of the Endangered Species Act (ESA). If potential effects are identified, the project may need further evaluation. Please review and answer each question carefully. Consider all phases of your project including, but not limited to, construction, normal operation, potential emergency operation, and ongoing and scheduled maintenance. To answer these questions, you may need to refer to site plans, grading and drainage plans, critical areas studies, or other documents you have prepared for your project. The City will evaluate your responses to determine if additional action is indicated. 1 If ESA listed species are present or ever were present in the watershed where your project will be located, your project has the potential to affect them, and you need to comply with the ESA. The questions in this section will help determine if the ESA listings will impact your project. For more information on potential salmonid presence in your project area contact the Washington Department of Fish and Wildlife Habitat Biologist for your region, WDFW Conservation or use the SalmonScape tool http://apps.wdfw.wa.gov/salmonscape/ 1. Are ESA listed salmonids currently present in the watershed within which your project willbe located? Yes x No Please describe. The WDWF SalmonScape Map includes Puget Sound Chinook Salmon with an ESA Threatened Status within the project limits which is Citywide. 2. Has there ever been an ESA listed salmonid stock present in this watershed? Yes x No Uncertain Please describe. WDFW 2016 Puget Sound Summer/Fall Chinook Preseason Forecast proposes Chinook will be present from both the Soos Creek and Icy Creek Hatcheries along with the Mainstem/Newaukum region. Those hatcheries and regions feed into the Green River. If you answered "yes" to either of the above questions you should complete the remainder of this checklist. 2 /-1 Part A - PROJECT SPECIFICS. Project and Vicinity City of Tukwila ESA Screening Checklist 1. Name of watershed: Green/Duwamish River Watershed 2. Name of nearest water body: Green River, Duwamish River and Tukwila Pond 3. What is the distance from this project to the nearest body of water? Non -Action Project is Citywide 4. What is the current land use between the project and the potentially affected water body (parking lots, farmland, etc)? Predominately industrial, commercial and residential. 5. Is the project above a: • Natural permanent barrier(waterfall) Yes No X • Natural temporary barrier(beaver pond) Yes No X • Man-made barrier (culvert, dam) Yes No X • Other (explain): 6. If answered Yes in #5, are there any resident salmonid populations above the blockage? Yes No Don't know X 3 City of Tukwila ESA Screening Checklist Part B - Project Specifics: Grading and Land Alteration 1. Does the project involve grading or land alteration of any kind? Yes No X If your project DOES NOT involve grading please skip to Part C. 2. Will the project involve the modification of a watercourse bank between Ordinary High Water (OHW) and the top of the bank? If yes, which watercourse? This includes any grading on any slope leading to a river or stream, but does not require work below OHW. Yes No 3. Will the project involve the modification of a watercourse bank or bottom below OHW? If yes, please explain. Yes No 4. Could the construction, operation, or maintenance of equipment for the project result in sediment transport off site or increased rates of erosion and/or sedimentation in watercourses? If no, please explain. Most projects involving grading have the potential to result in increased erosion and/or sedimentation as a result of land disturbance. Yes No 5. If the project involves grading, have you prepared a Temporary Erosion and Sedimentation Control Plan? Yes No If no, are you exempt under TMC 16.54.90? Yes No 6. Will the project result in new impervious services? Include all hard surface are such as rooftops, asphalt or concrete paving, compacted surfaces, etc. Yes No 7. What percent of the project will be impervious surface (including pavement & roof area)? 4 l •� Citty� of Tukwila ESA Screening Checklist Part C — Project Specifics: Water Quality 1. Will the project generate stormwater from the creation of impervious surfaces that will not be infiltrated on site? Please explain. For the purpose of this analysis, infiltration includes the use of a stormwater treatment and management system intended to contain all stormwater on site by allowing it to seep into the ground. Yes No X 2. Will the project result in the processing or handling, storage, or treatment of hazardous substances? This does not include fuel properly stored in a vehicle fuel tank, but does include fuel or other chemicals stored on -site during construction. Yes No X 3. Will the project require long-term or re -occurring maintenance requiring the use of fertilizers, pesticides, or other chemicals? This may include landscape maintenance, bridge or parking lot cleaning, ice removal/melt, repeated chemical vegetation clearing, etc. Yes No X 4. Will turbidity be increased during construction or operation of the project? Please explain any measures to be taken to ensure turbidity is not increased. Construction near the water or below OHW often will increase turbidity, both on -site and downstream. Yes No X 5. Will the project either reduce or increase shade along or over a water body? Removal of trees/vegetation or the building of over -water structures (docks or floats) will often result in a change to shade. Yes No X 6. Will the project require debris removal from below OHW of a water course? Debris includes, but is not limited to, fallen trees, logs, shrubs, rocks, piles, riprap, submerged metal, broken concrete, pipes, or other construction material. Yes No X 5 Part D — Project Specifics: Flov� Iterations and Fish Migration City of Tukwila ESA Screening Checklist 1. Will the project involve the direct alteration of the channel or bed of a water course? This includes both temporary and permanent modifications. If yes, please explain. Yes No X 2. Will the project involve any physical alteration to a wetland which is connected to a water course? Few wetlands are isolated, most contain either surface or subsurface connection to a flowing water course. Yes No X 3. Will water be rerouted, either temporarily or permanently as a result of the project? If yes, please explain. Yes No X 4. Will a culvert be installed or removed as part of this project? Yes No X 5. Will the project require withdrawal of surface water? If yes, please include amount and name or water body. Yes No X 6. Will the project result in the withdrawal, injection, or interception or groundwater? Examples of projects that might affect groundwater include, but are not limited to, construction of a new well, changes in withdrawal from an existing well, projects involving prolonged dewatering, installation of French drains, swales, or sewer lines. Projects that require a geotechnical report pursuant to TMC 18.45.060 should answer Yes. Yes No X 7. Will topography changes on the site affect the duration/direction of surface runoff flows? If yes, please describe changes. Yes No X 8. Will the project include bank stabilization? If yes, explain. Bank stabilization includes, but is not limited to, riprap, rock, logs, soil, vegetated revetments, concrete structures, or similar. Yes No X 9. Will there be retention or detention ponds? If yes, will this be an infiltration pond or a surface discharge to either a municipal storm water system or a surface water body? Yes No X 10. Will the project involve any reduction of the floodplain or floodway by filling or other partial blockage of flows? If yes, how will the loss of flood storage be mitigated by your project? Yes No X 11. Will project include the construction of a new wetland or waterway that is connected by surface flow to an existing waterway that contains salmonids? Yes No X 6 i SEPA Checklist Part E — Project Specifics: Vegetation 1. Will the project involve the removal of any vegetation? If yes, please describe existing conditions and the amount and type of vegetation to be removed. Yes No X 2. Will the project involve the removal of any vegetation within 200 feet of OHW of a water course? If yes, please describe type, size, method, and amount of vegetation to be removed. A tree is defined by TMC 18.06.845 as any self-supporting woody plant, generally characterized by one main trunk, with a potential diameter of 2inches or more at breast height and a minimum height of 10 feet. Yes No X 3. If vegetation is to be removed, do you plan to mitigate by replanting? Please explain. Yes No X 7 SEPA Checklist STATE ENVIR 1 NMENTAL POLICY ACT CHECKLIST Please respond to all questions. Use separate sheets as necessary. Department of Ecology provides a guidance on filling the SEPA checklist at DOE Environmental Checklist Guidance A. BACKGROUND 1. Name of proposed project, if applicable: Low Impact Development (LID) Code Implementation 2. Name of Applicant: City of Tukwila 3. Date checklist prepared: July 29, 2016 4. Agency requesting checklist: City of Tukwila 5. Proposed timing or schedule (including phasing, if applicable): Adoption of Low Impact Development is required by December 31, 2016 6. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No. 7. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. King County Environmental Checklist and Determination of Non -Significance that was given, attached. 8. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. Unknown. 1 SEPA Checklist 9. List any government approvals or permits that will be needed for yourproposal. The ordinance needs to be routed to the Department of Commerce for distribution to state agencies. 10. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. Pursuant to the Clean Water Act the City of Tukwila operates under an NPDES Municipal Stormwater Permit. The Permit is administered by the Washington State Department of Ecology (DOE). The City is required by .DOE to review, revise and make effective in the City's development —related codes, rules, standards, or other enforceable documents to incorporate and require LID principles and LID Best Management Practices (BMPs) in order to be in compliance with the latest version of the Stormwater Manual for Western Washington The City currently operates under the 2009 King County Surface Water Design Manual (KSWDM) which only encourages LID and BMPs. The City intends to adopt the 2016 KCSWDM which has incorporated LID principles and LID BMPs and rely upon King County's environmental review process by which an Determination of Non Significance (DNR) was issued.. Attached are proposed amendments to Tukwila Municipal Codes 14, 16 & 18 and King County's environmental checklist and DNR. 11. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, the tax lot number, and section, township, and range. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to thischecklist. This is a non -project action and impacts the entire City. 12. Does the proposal lie within an area designated on the City's Comprehensive Land Use Policy Plan Map as environmentally sensitive? Yes. The Ordinance will govern the entire City. 2 SEPA Checklist B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other: Non -project action. b. What is the steepest slope on the site (approximate percent slope)? Non -project action. c. What general types of soils are found on the site (for example, clay,sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland and whether the proposal results in removing any of these soils. Non -project action. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Non -project action. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Non -project action. 3 SEPA Checklist f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Non -project action. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt orbuildings)? Non -project action. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Non -project action. 2. jjz a. What types of emissions to the air would result from the proposal (for example, dust, automobile odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. Non -project action. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. Non -project action. 4 SEPA Checklist c. Proposed measures to reduce or control emissions or other impacts to air, if any: Non -project action. 3. Water a. Surface: 1. Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The City of Tukwila contains the Duwamish and Green Rivers as well as Tukwila Pond, Riverton Creek, Southgate Creek, Gilliam Creek, Johnson Creek, small streams and wetlands. 2. Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach availableplans. No, this is a non -project action. 3. Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. This is a non -project action. 4. Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities, ifknown. No, this is non -project action. 5 f , SEPA Checklist 5. Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. Areas around the Duwamish and Green Rivers are located within 100 year flood plains. This is a non -project action and thus there are no direct impacts to the flood plains. 6. Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. The City operates under a Municipal Stormwater Discharge Permit. The City's stormwater eventually drains to City streams and the Duwamish/Green Rivers. This is a non -project action, so specific volume of discharge is not known. Updating City codes and regulations requiring LID will improve the run-off that the City discharges. Also, the City intends on adopting the 2016 King County Surface Water Design Manual by December 31, 2016 which also mandates LID. b. Ground: 1. Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well? Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. None, this is a non -project action. 2. Describe waste materials that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve: None, this is a non -project action. 6 SEPA Checklist c. Water Runoff (including storm water): 1. Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow? Will this water flow into other waters? If so,describe. This is a non -project action. With the adoption of LID, the new regulations will aid in controlling stormwater runoff and stormwater quality. In addition, the City is in the process of adopting the 2016 KCSWDM which regulates the discharge of stormwater from both private and public Facilities. 2. Could waste materials enter ground or surface waters? If so, generally describe. This is a non -project action thus no construction is proposed. 3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. This is a non -project action thus no construction is proposed. d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts if any: This is a non -project action thus no construction is proposed. 7 l \ SEPA Checklist 4. Plants a. Check or circle types of vegetation found on the site: X Deciduous tree: alder, maple, aspen, other X Evergreen tree: fir, cedar, pine, other X Shrubs X Grass Pasture Crop or grain Wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other Water plants: water lily, eelgrass, milfoil, other X Other types of vegetation b. What kind and amount of vegetation will be removed or altered? This is a non -project action thus no construction is proposed. c. List threatened or endangered species known to be on or near the site. This is a non -project action. However, the Duwamish River is a migration route for Chinook Salmon. Additionally, several type II streams in the City have salmonid species. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: None, this is a non -project action thus no construction is proposed. e. List all noxious weeds and invasive species known to be on or near the site. This is a non -project action. 8 SEPA Checklist 5. Animals a. List any birds or animals which have been observed on or near the site or are known to be on or near the site: Birds: Hawk, heron, eagle, songbirds, other: Mammals: Deer, bear, elk, beaver, other: Fish: Bass, salmon, trout, herring, shellfish, other: Other: b. List any threatened or endangered species known to be on or near the site. This is a non -project action. However, the Duwamish River is a migration route for Chinook Salmon. Additionally, several Type 11 streams in the City have salmonid species. c. Is the site part of a migration route? If so, explain. The Duwamish River is a migration route For Chinook Salmon. Additionally, Several have type 11 streams in the City have salmonid species. d. Proposed measures to preserve or enhance wildlife, if any: This is a non -project action no proposed measures. e. List any invasive animal species known to be on or near the site: None known. 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. None, this is a non -project action. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No, this is a non -project action. 9 SEPA Checklist c. What kinds of energy ck servation features are included in the plans-0/this proposal? List other proposed measures to reduce or control energy impacts, if any: None, this is a non -project action. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. No, this is a non -project action. 1.Describe any known or possible contamination at the site from present or pastuses. None known. 2. Describe existing hazardous chemicals/conditions that might affect project development and design. This includes underground hazardous liquid and gas transmission pipelines located within the project area and in the vicinity. None, this is a non -project action. 3.Describe any toxic or hazardous chemicals that might be stored, used, or produced during the project's development or construction, or at any time during the operating life of theproject. None, this is a non -project action. 4. Describe special emergency services that might be required. None required, this is a non -project action. 5. Proposed measures to reduce or control environmental health hazards, if any: None proposed, this is a non -project action no proposed measures. 10 SEPA Checklist b. Noise 1. What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? This is a non -project action. However, typical day to day noise exists. 2. What types and levels of noise would be created by or associated with the project on a short-term or long-term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. No noise will occur, this is a non -project action. 3. Proposed measures to reduce or control noise impacts, ifany: None proposed, this is a non -project action. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Will the proposal affect current land uses on nearby or adjacent properties? If so,describe. N/A, this is a non -project action. b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses as a result of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use? N/A, this is a non -project action. 1. Will the proposal affect or be affected by surrounding working farm or forest land normal business operations, such as oversize equipment access, the application of pesticides, tilling, and harvesting? If so, how: N/A, this is a non -project action. c. Describe any structures on the site. N/A, This is non -project action. 11 SEPA Checklist d. Will any structures be demolished? If so, what? No, this is a non -project action. e. What is the current zoning classification of the site? N/A, this is a non -project action. f. What is the current comprehensive plan designation of the site? N/A, this is a non -project action. g. If applicable, what is the current shoreline master program designation of the site? N/A, this is a non -project action. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. N/A, this is a non -project action. i. Approximately how many people would reside or work in the completed project? N/A, this is a non -project action. j. Approximately how many people would the completed project displace? N/A, this is a non project action. 12 SEPA Checklist k. Proposed measures to avoid or reduce displacement impacts, ifany: N/A, this is a non -project action. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: N/A, this is a non -project action. m. Proposed measures to ensure the proposal is compatible with nearby agricultural and forest lands of long-term commercial significance, ifany: N/A, this is a non -project action. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing? N/A, this is a non -project action. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. N/A, this is a non -project action. c. Proposed measures to reduce or control housing impacts, ifany: N/A, this is a non -project action. 13 7 SEPA Checklist 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? N/A, this is a non -project action. b. What views in the immediate vicinity would be altered or obstructed? N/A, this is a non -project action. c. Proposed measures to reduce or control aesthetic impacts, ifany: N/A, this is a non -project action. 11. j.ight and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? N/A, this is a non -project action. b. Could light or glare from the finished project be a safety hazard or interfere with views? N/A, this is a non -project action. c. What existing off -site sources of light or glare may affect your proposal? N/A, this is a non -project action. 14 SEPA Checklist d. Proposed measures to reduce or control light and glare impacts, ifany: N/A, this is a non -project action. 12. Recreation a. What designed and informal recreational opportunities are in the immediate vicinity? N/A, this is a non -project action. b. Would the proposed project displace any existing recreational uses? If so,describe. N/A, this is a non -project action. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: N/A, this is a non -project action. 15 SEPA Checklist 13. Historic and Cultural Preservation a. Are there any buildings, structures, or sites located on or near the site that are over 45 years old listed in or eligible for listing in national, state or local preservation registers located on or near the site? If so, specifically describe. N/A, this is a non -project action. b. Are there any landmarks, features, or other evidence of Indian or historic use or occupation. This may include human burials or old cemeteries. Are there any material evidence, artifacts, or areas of cultural importance on or near the site? Please list any professional studies conducted at the site to identify such resources. N/A, this is a non -project action. c. Describe the methods used to assess the potential impacts to cultural and historic resources on or near the project site. Examples include consultation with tribes and the department of archeology and historic preservation, archaeological surveys, historic maps, GIS data, etc. N/A, this is a non -project action. d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and disturbance to resources. Please include plans for the above and any permits that may be required. N/A, this is a non -project action. 14. Transportation a. Identify public streets and highways serving the site or affected geographic area, and describe proposed access to the existing street system. Show on site plans, if any. N/A, this is a non -project action. 16 SEPA Checklist b. Is the site or affected geographic area currently served by public transit? If not, what is the approximate distance to the nearest transit stop? N/A, this is a non -project action. c. How many parking spaces would the completed project or non -project proposal have? How many would the project eliminate? N/A, this is a non -project action. d. Will the proposal require any new or improvements to existing roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). N/A, this is a non -project action. e. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. N/A, this is a non -project action. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur and what percentage of the volume would be trucks (such as commercial and nonpassenger vehicles). What data or transportation models were used to make these estimates? N/A, this is a non -project action. 17 i SEPA Checklist g. Will the proposal interfere with, affect or be affected by the movement of agricultural and forest products on roads or streets in the area? If so, generally describe. N/A, this is a non -project action. h. Proposed measures to reduce or control transportation impacts, if any: N/A, this is a non -project action. 15. Public Services a. Would the project result in an increased need for public services (for example: fire protection, police protection, public transit, health care, schools, other)? If so, generally describe. N/A, this is a non -project action. b. Proposed measures to reduce or control direct impacts on public services, if any. N/A, this is a non -project action. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system other: cable b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. N/A, this is a non -project action. 20 SEPA Checklist (NON -PROJECT PROPOSALS (E.G., SUBURBAN PLANS AND ZONING CODE TEXT CHANGES) MUST COMPLETE THE FOLLOWING PAGES). C. SUPPLEMENTAL SHEET FOR NON -PROJECT PROPOSALS (do not use this sheet for project actions) Because these questions are very general, it may be helpful to read them in conjunction with the list of elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposals be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? The City is proposing to update its current codes and standards with LID regulations. The City is required to adopt these changes in order to become compliant with the latest version of the Stormwater Manual for Western Washington adopted by the Department of Ecology. With the implementation of LID, the City can expect and increase in water quality and a reduction of pollutants in stormwater runoff from new development, redevelopment and construction sites. Since the City of Tukwila is a dense urban development, significant additional run-off is unlikely. In fact, as properties develop and redevelop, they will be required to comply with the new LID regulations and the 2016 Manual thus existing run-off into water bodies will be improved. Proposed measures to avoid or reduce such increases are: None are needed. 2. How would the proposal be likely to affect plants, animals, fish, or marinelife? The biggest potential impact will be to fish and marine life within the Duwamish/Green Rivers. Stormwater discharge eventually drains to the Duwamish/Green Rivers and ultimately Puget Sound. Stormwater discharges include run-off from streets, parking lots, vegetated areas, and buildings. The discharge can include pollutants such as oils and heavy metals. It is hoped that by adopting LID regulations along with the 2016 Manual requirements pollutants within the City's stormwater discharge will be reduced and thus the city will be assisting in regional efforts to improve water quality in the Duwamish/Green Rivers and Puget Sound. Proposed measures to protect or conserve plants, animals, fish, or marine life are: Not applicable. 19 3. How would the proposal be likely -to deplete energy or naturalresources? SEPA Checklist Not applicable. Proposed measures to protect or conserve energy and natural resources are: Not applicable. 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitats, historic or cultural sites, wetlands, floodplains, or prime farmlands? Not applicable. Proposed measures to protect such resources or to avoid or reduce impacts are: Not applicable. 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existingplans? Not applicable. Proposed measures to avoid or reduce shoreline and land use impacts are: Not applicable. 6. How would the proposal be likely to increase demands on transportation or public service and utilities? Not applicable. 20 SEPA Check"ist Proposed measures to reduce or respond to such demand(s) are: Not applicable. 7. Identify, if possible, whether the proposal may conflict with Local, State, or Federal laws or requirements for the protection of theenvironment. Not applicable. D. SIGNATURE Under the penalty of perjury the above answers under ESA Screening Checklist and State Environmental Policy Act Checklist are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: fdL•QUAl),Vvo Date Submitted: August 15, 2016 21 f CITY OF TUKWILA Department of Community Deve 6300 Southcenter Boulevard, Ste 100 Tukwila, WA 98188 Telephone: (206) 431-3670 rn SEPA PIu `Y 'ENVIRONMENTAL AUG 38 2016 REVIEW Community Development APPLICATION FOR STAFF USE ONLY Permits Plus TYPE: P-SEPA Planner: File Number: L. /a, ... (..)as Application Complete Date: Project File Number:pz_ /c k �" Application Incomplete Date: Other File Numbers: NAME OF PROJECT/DEVELOPMENT: Adopt Low Impact Development Requirements BRIEF DESCRIPTION OF SCOPE OF WORK: Revise and make effective in the City's codes, rules, and standards to incorporate Low Impact Development (LID) principles and LID Best Management Practices (BMPs). This application requires public notice. Please see section 7 of the application checklist. LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and subdivision, access street, and nearest intersection. City wide. LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement). City wide. DEVELOPMENT COORDINATOR/ PROJECT CONTACT: The individual who: • has decision making authority on behalf of the owner/applicant in meetings with City staff, • has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards, and • is the primary contact with the City to whom all notices and reports will be sent. • PLEASE PRINT CLEARL Y Name: Greg Villanueva, City of Tukwila Public Works Department Address: 6300 Southcenter Blvd. Suite 100 CITY, ST, ZIP Tukwila, WA, 98188 Phone: (206) 431-2442 E-mail: greg.villanueva@tukwilawa.gov Signature: Gracubwo-, Date: August 11, 2016 • \\citystore\City Common\Teri - DCD\Kirby\SEPA to fix\SEPA Environmental Review Application FINAL 5-9-16.docx AUG 152016 C' v-,-? ur .t Development King County ENVIRONMENTAL CHECKLIST FOR REVISIONS TO SURFACE WATER DESIGN MANUAL PUBLIC RULE STORMWATER POLLUTION PREVENTION MANUAL PUBLIC RULE RELATED SECTIONS OF KING COUNTY CODE Purpose of checklist: Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant. This information is also helpful to determine if available avoidance, minimization or compensatory mitigation measures will address the probable significant impacts or if an environmental impact statement will be prepared to further analyze the proposal. A. Background 1. Name of proposed project, if applicable: Revisions to King County's Surface Water Design Manual Public Rule, its Stormwater Pollution Plan Public Rule, and related revisions to King County Code. 2. Name of applicant: King County Department of Natural Resources and Parks Water and Land Resources Division (WLRD) 3. Address and phone number of applicant and contact person: APPLICANT Mark Isaacson, Director King County WLR Division 201 S. Jackson Street, Suite 600 Seattle, WA 98104-3855 Phone: (206) 477-4601 Fax: (206) 296-0192 4. Date checklist prepared: 11.4.15 5. Agency requesting checklist: CONTACT PERSON Curt Crawford, Stormwater Services Section Manager King County WLR Division 201 S. Jackson Street, Suite 600 Seattle, WA 98104-3855 Phone: (206) 477-4675 Fax: (206) 296-0192 SEPA Environmental checklist (WAC 197-11-960) November 2015 Page 11 King County Department of Natural Resources and Parks Water and Land Resources (WLR) Division 6. Proposed timing or schedule (including phasing, if applicable): The proposal action is expected to be adopted and in effect on February 3, 2016. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. None identified at this time. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. No environmental information directly related to this proposal has been prepared. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. These are non -project actions that affect the county as a whole, not any specific property. 10. List any government approvals or permits that will be needed for your proposal, if known. The county council must adopt the proposed revisions to the King County Code and the public rules must be adopted through the prescribed process. 11 Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) This proposal is a nonproject action. The proposal will update King County Codes and amend the existing public rules that establish both standard procedures for drainage review and design of development projects in unincorporated King County and best management practices for controlling pollution from potentially pollution -generating activities. The overall objectives of the action are: 1) to provide better protection of environmental resources and private property and, 2) to meet the intent of requirements of the Washington State Growth Management Act, the Clean Water Act, and King County's Phase I Municipal Stormwater Permit (the Permit). The update is needed to comply with the Permit's requirement that King County's standards for stormwater management are equivalent to those of the 2014 Stormwater Management Manual for Western Washington and that King County make Low Impact Development (LID) the preferred and commonly used approach to site development. A key proposed change to stormwater regulations is the requirement for implementation of flow control BMPs (aka LID BMPs) to the maximum extent feasible. The update also includes numerous minor changes to clarify language, added technical guidance, and redrafted figures. All of the proposed changes provide increased protection of aquatic resources. SEPA Environmental checklist ()MAC 197-11-960) November 2015 Page 12 / \ / \ 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map,.=,, - and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. AIJG 15 2018 mmur;t This proposal is a nonproject action that will affect all of the unincorporated area of King . . County. B. ENVIRONMENTAL ELEMENTS [omitted consistent with RCW 197-11-315(1)(e)] C. Signature The answers above and below are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: Name of signee: Mark Isaacson Position and Agency/Organization: Director, King County Water and Land Resources Division Date Submitted: NA D. Supplemental sheet for nonproject actions 1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? Increased infiltration of stormwater as a result of the proposal to expand the use of flow control BMPs (aka LID BMPs) has the potential to increase pollutant discharge to groundwater. By requiring treatment for pollution generating surfaces prior to infiltration, the proposals seeks to minimize these potential impacts. The increased infiltration of stormwater is expected to have a positive impact on surface waters by attenuating flows from developed surfaces in a manner that more closely matches natural conditions. 2. How would the proposal be likely to affect plants, animals, fish, or marine life? Increased infiltration of stormwater as a result of the proposal to expand the use of flow control BMPs is intended to improve conditions that are supportive of healthy aquatic biota or at the very least minimize further harm, by attenuating flows from developed surfaces in a manner that more closely matches natural conditions. 3. How would the proposal be likely to deplete energy or natural resources? The proposal would not be likely to deplete energy or natural resources. 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime farmlands? SEPA Environmental checklist (WAC 197-11-960) November 2015 Page 13 The proposal is designed to manage stormwater impacts from development and redevelopment in a manner that more closely mimics predevelopment conditions. The benefits of managing stormwater under this proposal should extend throughout the ecosystem. 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existing plans? This proposal will not encourage land or shoreline uses incompatible with existing plans. 6. How would the proposal be likely to increase demands on transportation or public services and utilities? To the extent that the proposal results in increased numbers flow control best management practices (BMPs) on private property, it will increase the need for inspections by King County's stormwater services personnel. 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment. No conflicts are identified. SEPA Environmental checklist (WAC 197-11-960) November 2015 Page 14 8/15/2016 r 18257- King County kg King County 18257 r-'.fir err, nr.-. AUG I 5XI .ROPOLITAN KING COUNTY COUNCIL Community NOTICE OF ADOPTION Development Ordinance 18257 18257 NOTICE IS HEREBY GIVEN that the Metropolitan King County Council (the Council) held a public hearing in the Council Chambers on the 10th Floor of the King County Courthouse (516 Third Avenue, Seattle, WA) on Monday, March 14, 2016, beginning at 1:30 PM. The purpose of this public hearing was to consider adoption of Proposed Ordinance 2016-0012 (Ordinance 18257) an ordinance relating to the County's stormwater and surface water regulations. SUMMARY: Ordinance 18257 amends the regulations pertaining to the County's stormwater and surface water regulations, in order to comply with federal and state requirements for stormwater management. Major changes include adoption of low impact development techniques for development projects, adoption of right of entry provisions for specific circumstances, and changes to the penalties for water quality violations. A copy of Ordinance 18257 will be mailed upon request to the Clerk of the Council, Room 1200, King County Courthouse, 516 Third Avenue, Seattle, WA 98104, telephone 206-477-1020. It is available on the Internet at http://mkccle9isearch.kingcounty.gov/LegislationDetail.aspx?l D=2539705&GU I D=F9648BFD-C6BB-4135-A9D5- C EFD F41 C7F64&Options=1 D lTextJ&Search=18257. Dated at Seattle, Washington, this 30th day of March, 2016. METROPOLITAN KING COUNTY COUNCIL KING COUNTY, WASHINGTON Anne Noris Clerk of the Council King County Council 516 Third Ave, Room 1200 Seattle, WA 98104 http://www.kingcounty.gov/council/clerk/notice enactment/18257Notice.aspx 1/2 8/15/2016 Get directions 18257- King County CONTACT THE COUNCIL Main phone: 206-477-1000 TTY/TDD: 206-296-1024 Fax: 206-296-0198 III • MI Last Updated March 30, 2016 RMapt datiagelibl6 .......................................... http://www.kingcounty.gov/council/clerk/notice enactment/18257Notice.aspx 2/2 King County Determination of Nonsignificance Description of Proposal: This proposal is a nonproject action. The proposal will update King County Codes and amend the existing public rules that establish both standard procedures for drainage review and design of development projects in unincorporated King County and best management practices for controlling pollution from potentially pollution -generating activities. The overall objectives of the action are: 1) to provide better protection of environmental resources and private property and, 2) to meet the intent of requirements of the Washington State Growth Management Act, the Clean Water Act, and King County's Phase I Municipal Stormwater Permit (the Permit). The update is needed to comply with the Permit's requirement that King County's standards for stormwater management are equivalent to those of the 2014 Stormwater Management Manual for Western Washington and that King County make Low Impact Development (LID) the preferred and commonly used approach to site development. A key proposed change to stormwater regulations is the requirement for implementation of flow control BMPs (aka LID BMPs) to the maximum extent feasible. The update also includes numerous minor changes to clarify language, added technical guidance, and redrafted figures. All of the proposed changes provide increased protection of aquatic resources. Location of Proposal: This is a non -project action that applies to all of unincorporated King County. Proponent and Lead Agency: King County Department of Natural Resources and Parks Water and Land Resources Division The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030 (2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. ® There is no comment period for this DNS. ❑ This DNS is issued after using the optional DNS process in WAC 197-11-355. There is no further comment period on the DNS. ❑ This DNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date below. Comments must be submitted by Responsible Official: Position/Title: Phone: Mark Isaacson Division Director, Water and Land Resources Division (206) 477-4601 Address: 201 South Jackson Stre t, Suite 600 Seattle, WA 98104-38 5 DATE: November , 2015 SIGNATURE: E n City of Tukwila Jim Haggerton, Mayor Department of Community Development Jack Pace, Director FINAL STAFF EVALUATION FOR ENVIRONMENTAL CHECKLIST File No: E16-0008 I. SUMMARY OF PROPOSED ACTION Amendments to the Tukwila Municipal Code (TMC) referencing the updated King County Surface Water Design Manual, proposed related TMC amendments, and the Infrastructure Design and Construction Standards manual, which will guide drainage review and the design of development projects. II. GENERAL INFORMATION Project Name: Tukwila Surface Water Manual update and Low Impact Development guidelines Applicant: City of Tukwila Public Works Location: City-wide Zoning: All zones Comprehensive Plan Designation: All area The following information was considered as part of review of this application. 1. ESA Screening Checklist and SEPA Checklist dated August 15, 2016. 2. Proposed code amendments to the TMC chapters on Surface Water Management (TMC 14.30,) Grading (TMC 16.54,) and Zoning (TMC 18) and the City's Infrastructure Design and Construction Standards manual. III. BACKGROUND/PROPOSAL The proposal is a nonproject action. The proposalwill update Tukwila Municipal Code as they relate to surface water drainage. The proposal establishes standards and procedures for drainage review and the design of development projects in Tukwila and best management practices for controlling pollution from potentially pollution generating activities. The overall objectives of the action are: 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax:• 206-431-3665 Surface Water Regulatory Updates: E16-0008 Provide better protection of environmental resources and private property and, Meet the intent of the requirements of the WA State Growth Management Act, the Clean Water Act and Tukwila' s Phase 1 Municipal Stormwater permit. Specifically, the update is needed to comply with the Permit' s requirement that Tukwila standards for surface water management be equivalent to those of the 2014 Stormwater Management Manual for Western WA and that Tukwila make low impact development (LID) the preferred and commonly used approach to site development. A key proposed change to stormwater regulation is the requirement for implementation of flow control BMPS (aka LID BMPs) to the maximum extent feasible. The update also includes numerous minor changes to clarify language and added technical guidance. All of the proposed changes provide increased protection of aquatic resources. IV. REVIEW OF THE ENVIRONMENTAL CHECKLIST The following lists the elements contained within the Environmental Checklist submitted for the proposed project. The numbers in the staff evaluation correspond to the numbers in the Environmental Checklist. If staff concurs with the applicant' s response, this is so stated. If the response to a particular item in the checklist is found to be inadequate or clarification is needed, there is additional staff comment and evaluation. A. BACKGROUND: 1-12—Concur with checklist. B. ENVIRONMENTAL ELEMENTS: 1. Earth: a—h—Concur with checklist. 2. Air: a-c—Concur with checklist. 3. Water: a(1)—(6)—A segment of the Black River also occurs in Tukwila. b(1) and (2)—Concur with checklist. c(1)—(3) — Concur with checklist d—Concur with checklist. 4. Plants: a—d—Concur with checklist. 5. Animals: a-d—the City is also known to be under the Pacific Flyway, a primary corridor for migratory bird species. Page 2 of 5 09/16/2016 Surface Water Regulatory Updates: E16-0008 6. Energy and Natural Resources: a-c—Concur with checklist. 7. Environmental Health: a —Concur with checklist. a(1)-(2)—Concur with checklist. b(1)—Concur with checklist. b(2)-(3)— Concur with checklist. 8. Land and Shoreline Use: a —The area of the proposed work is undeveloped and adjacent to a parking lot, with a portion of the Green River Trail running through it. b-f—Concur with checklist. g—Concur with checklist. The site is in an un-leveed portion of the river. h— Concur with checklist. The project is also within the N'EMA 100 year floodway. The site contains areas sloping between 15% and 40% and underlain by permeable soils and engineered fill. i-1—Concur with checklist. 9. Housing: a-c—Concur with checklist. 10. Aesthetics: a-c—Concur with checklist. 11. Light and Glare: a-d—Concur with checklist. 12. Recreation: a—c -Concur with checklist. 13. Historic and Cultural Preservation: a-c—Concur with checklist. 14. Transportation: a-g—Concur with checklist. 15. Public Services: a-b—Applicant did not indicate if the regulations will result in additional need for regulatory review. 16. Utilities: Page 3 of 5 09/16/2016 Surface Water Regulatory Updates: E16-0008 a-b—Concur with checklist. C. Supplemental sheet for Non -project proposals. 1. Concur with checklist 2. There is the potential to preserve existing plants and possibly see an increase in the City's amount of vegetation due to the proposed changes, which would have a positive benefit on animals. Due to the potential increase in water quality, fish and marine life may also benefit. 3. The movement from mechanical systems to control and clean surface water to the use of low impact development techniques may have the added benefit of reducing the need for maintenance vehicles and manufacturing of mechanical stormwater systems thereby lessening the depletion of energy resources. 4. Although surface water run-off is typically not allowed into the City's wetlands or watercourses without treatment for water quality and not typically allowed on steep slopes, all of the City's surface water eventually discharges into the Green/Duwamish River. The proposal should have no impact or a positive impact on the City's environmentally sensitive areas as the intent is that an LID approach is more successful than current methods for treating storm water quality and controlling storm water quantity. 5. The proposal has the potential to result in greater vegetative cover in the City, that is, more landscaped areas on developed properties and prohibitions on clearing of land without development permits. 6. Concur 7. The proposal is the result of compliance with federal and state environmental requirements from the Clean Water Act to the City of Tukwila NPDES permit from the WA State Department of Ecology. IV. PUBLIC COMMENTS Notice of Application was published in the Seattle Times and sent to the following agencies: WA State Departments of Commerce and Ecology, Southwest King County Chamber of Commerce, Fisheries Division of the Muckleshoot Indian Tribe; Tukwila Historical Society, Duwamish River Clean Up coalition, Washington Environmental Council; People for Puget Sound; Puget Soundkeeper, Futurewise, and attendees of the Surface Water Low Impact Development Open House held on August 10. Puget Soundkeepers had questions, received clarification and had no official comment. VI. CONCLUSION The proposal can be found to not have a probable significant adverse impact on the environment and pursuant to the City of Tukwila' s SEPA rules regarding Threshold determinations (TMC 21.04.150,) a Determination of Nonsignificance (DNS) is issued for this project. Page 4 of 5 09/16/2016 Surface Water Regulatory Updates: E16-0008 This DNS is based on impacts identified within the environmental checklist, attachments, and the above "Final Staff Evaluation for Application No. E16-0008", and is supported by policies, and regulations formally adopted by city of Tukwila for the exercise of substantive authority under SEPA to approve, condition, or deny proposed actions. Prepared by: Moira Carr Bradshaw, Senior Planner Date: September 15, 2016 Page 5 of 5 09/16/2016 Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:46 AM To: 'rcbetteridge@gmail.com' Subject: Surface Water LID Attachments: E16-0008.pdf Attached is the NOA for a City of Tukwila SEPA project. Please contact the project planner, Moira Bradshaw, at moira.bradshaw@tukwilawa.gov Sincerely, Teri Svedahl Land Use and Sign application intake hours are: M — F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila I Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri.Svedahl@Tukwila WA.gov PM:MESSIONAL RESPONSIVE The City of opportunity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:48 AM To: 'ajmd52@hotmail.com' Subject: Surface Water LID NOA Attachments: E16-0008.pdf Attached is a Notice of Application for the Surface Water LID project. Please direct any question you may have to the project planner, Moira Bradshaw, at moira.bradshaw@tukwilawa.gov Land Use and Sign application intake hours are: M — F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila I Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri.SvedahlTukwila WA.gov IIONAL ION55VE The City of opportuity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** 1 Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:50 AM To: 'ezisette@yahoo.com' Subject: Surface Water LID Attachments: E16-0008.pdf Attached is the Notice of Application for the Surface Water LID project. Please direct any questions you may have to Moira Bradshaw at 11loira.Bradshaw@ fukwilawa.gov Land Use and Sign application intake hours are: M — F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri.SveclahlTukwila WA.gov The City of opportunity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** 1 Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:53 AM To: Brooke Alford Subject: Surface Water LID Attachments: E16-0008.pdf Attached is the NOA for the Surface Water LID project. Please contact Moira Bradshaw with any questions. Moira.Bradshaw tt I ul wila\\'a.gov Land Use and Sign application intake hours are: 11/1—F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri. SvedahlTukwila WA.gov RESPONSIVE The City of opportunity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** 1 Teri Svedahl From: Moira Bradshaw Sent: Thursday, August 18, 2016 9:42 AM To: Teri Svedahl Subject: Updates to Agency Routing Checklist Teri — Would you please add the info for Puget Soundkeeper Alliance (info below) to the Agency Routing Checklist. Also I googled WA State Department of Community Development and this come up : http://www.commerce.wa.gov/contact-us/ So we can change the name on the Checklist. Thanks. M From: Greg Villanueva Sent: Thursday, August 18, 2016 9:37 AM To: Moira Bradshaw Subject: FW: Low Impact Development Open House Moira, Here's the contact info for Puget Soundkeeper. Thanks for all you do! Greg V. From: Kimby Wells[mailto:Kimby@pugetsoundkeeper.org] Sent: Thursday, August 11, 2016 3:44 PM To: Greg Villanueva Subject: RE: Low Impact Development Open House Thanks Greg, I will read through all of the materials you sent and get back to you with comments. Kimberly Wells Legal Fellow Puget Soundkeeper Alliance 130 Nickerson Street, Suite 107 Seattle, WA 98109 (206)297-7002 x100 kimby@pugetsoundkeeper.org www.pugetsoundkeeper.org PUGET SOUNDKEERER' 1 Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:56 AM To: 'kimby@pugetsoundkeeper.org' Subject: Surface Water LID Tukwila Project Attachments: E16-0008.pdf Attached is the NOA for the Surface Water LID, Tukwila project Please contact Moira Bradshaw with any questions you may have. Moira .Bradshaw@>, i ukwilaWa.gov Land Use and Sign application intake hours are: M — F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila I Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri. Svedahl@Tuk wila WA gov PROF RESPONSIVE The City of opportunity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** 1 et* of J dim &a Department Of Community Development AFFIDAVIT OF DISTRIBUTION I, Teri Svedahl , HEREBY DECLARE THAT: X Notice of Application Notice of Decision Notice of Public Hearing Notice of Public Meeting Determination of Non- Significance Mitigated Determination of Non - Significance Determination of Significance & Scoping Notice Short Subdivision Agenda Notice of Application for Shoreline Mgmt Permit Shoreline Mgmt Permit Board of Appeals Agenda Packet Board of Adjustment Agenda Packet Official Notice Notice of Action Other: Was mailed to each of the addresses listed/attached on this 19th day of _August 2016 Project Name: KC SURFACE WATER DESIGN LID Project Number: PL16-0037 Associated File Number (s): E16-0008 Mailing requested by: Moira Bradshaw I 177( ���� Mailer's signature: leei OOe2Z%ill W:\USERS\TERI\TEMPLATES-FORMS\AFFIDAVIT OF DISTRIBUTION.DOC / \ 4 , i-\ CITY OF TI KWILA NOTICE OF APPLICATION 19 August 2016 J PROJECT INFORMATION The City of Tukwila Public Works Department has submitted a State Environmental Policy Act (SEPA) Checklist and supporting information. The SEPA information evaluates the potential impacts associated with adoption of the new King County Surface Water Design Manual and proposed related Tukwila Municipal Code (TMC) amendments that will guide drainage review and the design of development projects. The proposed legislation will apply city-wide in Tukwila. Land Use Activity File Number: E16-0008 FILES AVAILABLE FOR PUBLIC REVIEW AT: City of Tukwila, Department of Community Development (DCD), 6300 Southcenter Boulevard, Suite 100; Tukwila, WA 98188; 8:30 a.m. - 5:00 p.m. Monday - Friday. OPPORTUNITY FOR PUBLIC COMMENT Your comments on the project are requested: • Written or e-mail comments must be delivered to DCD on the proposed SEPA decision at the address above no later than 5:00 P.M. Friday 2 September 2016. • A public hearing will be held before the Tukwila Planning Commission on the proposed TMC amendments. You will be notified when that date and time have been scheduled. APPEALS You may request a copy of arty decision, information on hearings, and your appeal rights by calling DCD at (206) 431-3670. For further information on this proposal, contact: • Moira Carr Bradshaw at (206) 431-3651, moira.bradshaw@tukwilawa.gov • City of Tukwila Department of Community Development • 6300 Southcenter Boulevard, Suite 100, • Tukwila, WA 98188 • Monday through Friday, 8:30 a.m. - 5:00 p.m. Application Filed: August 15, 2016 Notice of Completeness Issued: August 17, 2016 Notice of Application Issued: August 19, 2016 Z:\DCD & PW \ Low Impact Dev \ SEPA \ E16-0008 Notice of Application.doc �-"\ ,� AGENCY LABELS f� City Clerk Office — Christy 0' Flaherty PUBLIC HEARINGS/MEETINGS NEED TO GO TO CHRISTY ( ) US Corps of Engineers ( ) Federal HWY Admin ( ) Federal Transit Admin, Region 10 ( ) Dept of Fish & Wildlife Section 1 FEDERAL AGENCIES ( ) US Environmental Protection Agency (E.P.A.) ( ) US Dept of HUD ( ) National Marine Fisheries Service ( ( ( ( ( ( Section 2 WASHINGTON STATE AGENCIES ) Office of Archaeology ) Transportation Department (WSDOT NW) ) Dept of Natural Resources ) Office of the Governor ��u� WA State 6 mmt�+t Bevelepment � ) WA Fisheries & Wildlife, MillCreek Office ) WA Fisheries & Wildlife, Larry Fisher, 1775 12th Ave NW Ste 201, Issaquah WA 98027 ( ( ( ( ) Dept of Social & Health Services ) Dept of Ecology NW Regional Office, Shoreland Div. SHORELINE NOD REQUIRES RETURN RECEIPT blept of Ecology, SEPA **Send Electronically ) Office of Attorney General ) Office of Hearing Examiner Section 3 KING COUNTY AGENCIES ( ) KC Boundary Review Board ( ) Health Department ( ) Fire District # 11 ( ) Port of Seattle ( ) Fire District # 2 ( ) KC Dev & Enviro Services-SEPA Info Center ( ) KC Wastewater Treatment Div ( ) KC Metro Transit Div-SEPA Official, Environmental Planning ( ) KC Dept of Parks & Recreation ( ) KC Dept of Natural Resources ( ) KC Assessor's Office ( ) KC Watershed Coordination WRIA 9 ( ) KC Dept of Natural Resources, Andy Levesque Section 4 SCHOOLS/LIBRARIES ( ) KC Public Library System ( ) Westfield Mall Library ( ) Foster Library ( ) Tukwila School District ( ) Renton Library ( ) Highline School District ( ) Kent Library ( ) Seattle School District ( ) Seattle Library ( ) Renton School District Section 5 UTILITIES ( ) Century Link ( ) BP Olympic Pipeline ( ) Seattle Public Utilities ( ) Seattle City Light ( ) Val-Vue Sewer District ( ) Waste Management ( ) Puget Sound Energy ( ) Water District # 20 ( ) Cascade Water Alliance ( ) Highline Water District ( ) Water District # 125 ( ) Seattle Planning &Dev/Water Dept ( ) City of Renton Public Works ( ) Comcast ( ) Bryn Mawr-Lakeridge Sewer/Water Dist ( ) Tukwila City Departments ( ) Public Works ( ) Fire ( ) Police ( ) Finance OManning OBuilding ) City of Burien ( ) Parks & Rec ( ) Mayor p/ ( City of Seattle City Clerk (PUBLIC HEARINGS/MEETINGS) ( ) Strategic Planning *Notice of all Seattle Related Projects Section 6 CITY AGENCIES ( ) Kent Planning Dept ( ) Renton Planning Dept ( ) City of SeaTac Puget Sound Regional Council W KC Chamber of Commerce Muckleshoot Indian Tribe * ( Cultural Resources Fisheries Program ( ) Wildlife Program ( ) Duwamish Indian Tribe * Tukwila Historical Society** Section 7 OTHER LOCAL AGENCIES ( ) Puget Sound Clean Air Agency ( )Sound Transit/SEPA Duwamish River Clean Up Coalition ♦\ ashington Environmental Council People for Puget Sound * Futurewise * send notice_of'all applications on Green/Duwamish River ** send notices for all Tukwila projects which require public notice — via email to tukwilahistsociety0tukwilahistorv.orq and rcwieser comcast.net * ( ) Seattle Times ( ) South County Journal Section 8 MEDIA ( ) Highline Times ( ) City of Tukwila Website W:Admin\Admin Forms\Agency Checklist Public Notice Mailings For Permits SEPA MAILINGS (comment period starts on date of mailing) Notice of Application mailed to: Department of Ecology (send checklist with Notice of Application), applicant, other agencies as necessary, property owners and tenants within 500 feet. It is also posted on site. KC Transit Division — SEPA Official would like to receive information about all projects that might affect transit demand. Tribes — For any application on the Green/Duwamish River, send the checklist and a full set of plans with the Notice of Application SEPA Determination mailed to Dept. of Ecology Environmental Review Section *Applicant *Other agencies as necessary (checked off on attached list) *Any parties of record * send only the staff report, site plan and the SEPA Determination Send These Documents to DOE at the time of SEPA determination: SEPA Determination Staff report SEPA Checklist (filled out by applicant) Drawings/Plans of project (site plan, elevations, etc. from PMT's) Affidavit of Distribution (notice was mailed or sent to newspaper) SHORELINE MAILINGS: Notice of Application for a Substantial Development Permit must be mailed to applicant, property owners and residents within 500 feet of subject property, agencies with jurisdiction. Comments are due 30 days after the notice of application is mailed/posted. The Notice of Application for a Shoreline Substantial Development Permit must include a statement that any person desiring to submit written comments on the application or desiring to receive notification of the final decision on the application may do so within 30 days of the Notice of Application. If a hearing will be held on the application, the hearing notice must include the information that written comments may be submitted, or oral presentation made at the hearing. Notice is sent to Ecology's NW Regional Office Shorelands & Environmental Assistance Program. Shoreline Permit Notice of Decision: Mail to: (within 8 days of decision; 21-day appeal period begins date of filing with DOE) — Notice to DOE must be by return receipt requested mail (this requirement included in SSB 5192, effective 7-22-11). Department of Ecology Shorelands Section, NW Regional Office State Attorney General *Applicant *Indian Tribes *Other agencies as necessary (checked off on attached list). *Any parties of record * send only t , notice of decision and staff report, site plan and the SEPA Determination nd h Z\ -1 A A4 D • m - n o DOE and A Borne G - neral: One complete packet should also be sent to Muckleshoot Indian Tribe if they commented on the project during comment period. Permit Data Sheet Shoreline Substantial Development Decision (Signed by Director) Findings (staff report or memo) Shoreline Permit Application Form (filled out by applicant) Drawings/Plans of project (site plan, elevations, etc. from PMT's) - Site plan, with mean high water mark & improvements - Cross -sections of site with structures & shoreline - Grading Plan — Vicinity map SEPA determination (Signed by Director) Findings (staff report or memo) SEPA Checklist (filled out by applicant) Any background studies related to impacts on shoreline Notice of Application Affidavit of Distribution (notice was mailed) W:Admin\Admin Forms\Agency Checklist Moira Bradshaw From: Greg Villanueva Sent: Thursday, September 15, 2016 3:52 PM To: Moira Bradshaw Subject: FW: Low Impact Development Open House Moira, below is the email we discussed. Greg V From: Kimby Wells[mailto:Kimby@pugetsoundkeeper.org] Sent: Monday, August 22, 2016 6:15 PM To: Greg Villanueva Cc: Ryan Larson Subject: Re: Low Impact Development Open House Dear Greg, Thank you for sending the materials about Tukwila's code and document updates to incorporate and require LID. I sincerely appreciate your transparency with this process. Moira was also very helpful in explaining the materials. Together you have answered all of my questions. Soundkeeper will not be submitting any formal comments on the proposed amendment. Kimberly From: Greg Villanueva <Greg.Villanueva@TukwilaWA.gov> Sent: Thursday, August 11, 2016 3:08:05 PM To: Kimby Wells Cc: Ryan Larson Subject: RE: Low Impact Development Open House Hi Kimberly, Attached are copies of our proposed amendments & additions to Tukwila's development codes and Infrastructure and Design Construction Standards, including standard details. That were handed out for comments at last night's Lid Open House. For all text, proposed amendments are presented in strikeout and underline. New and updated standard details are at the end of the IDCS document. We are requesting that any comments be returned by August 22nd. If you do not have comments then please let me know. Due to the file sizes, following this email will be two more emails with attachments. Respectfully, Greg Villanueva NPDES Coordinator 6300 Southcenter Boulevard Tukwila, WA 98188-2544 1 206-431-2442 Office 206-571-6321 Cell Greq. villanueva(citukwilawa. qov From: Kimby Wells [mailto:Kimby@pugetsoundkeeper.org] Sent: Wednesday, August 10, 2016 12:41 PM To: Greg Villanueva Subject: RE: Low Impact Development Open House Hi Greg, Thank you for the invitation. Unfortunately I will not be able to attend your open house tonight. Please keep me posted as you schedule other opportunities to engage, such as hearings or opportunities to submit comments on the proposed code and document updates. Thank you, Kimberly Wells Legal Fellow Puget Soundkeeper Alliance 130 Nickerson Street, Suite 107 Seattle, WA 98109 (206)297-7002 x100 kimbv@pugetsoundkeeper.org www.pugetsoundkeeper.org PUGET SOUNDKEEPER' The information contained in this e-mail message may be privileged, confidential and protected from disclosure. If you are not the intended recipient, any dissemination, distribution or copying is strictly prohibited. If you think that you have received this e-mail message in error, please notify the sender by reply e-mail and delete this message and any attachments. From: Greg Villanueva [mailto:Greg.Villanueva(&TukwilaWA.gov] Sent: Thursday, July 14, 2016 10:54 AM To: Kimby Wells Cc: Ryan Larson Subject: Low Impact Development Open House Hi Kimberly, 2 l Denis Law Mayor �Hy September 2, 2016 Community & Economic Development C. E. "Chip" Vincent, Administrator Washington State Department of Ecology Environmental Review Section PO Box 47703 Olympia, WA 98504-7703 Subject: ENVIRONMENTAL (SEPA) THRESHOLD DETERMINATION Transmitted herewith is a copy of the Environmental Determination for the following project reviewed by the Environmental Review Committee (ERC) on August 29, 2016: SEPA DETERMINATION: PROJECT NAME: PROJECT NUMBER: Determination of Non -Significance (DNS) Low Impact Development (LID) Code Revisions LUA16-000658, ECF Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on September 16, 2016, together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed by RMC 4-8-110 and information regarding the appeal process may be obtained from the City Clerk's Office, (425) 430-6510. Please refer to the enclosed Notice of Environmental Determination for complete details. If you have questions, please call me at (425) 430-6576. For the Environmental Review Committee, /1,(4,4;-) Angie Mathias Long Range Planning Manager Enclosure cc: King County Wastewater Treatment Division Boyd Powers, Department of Natural Resources Karen Walter, Fisheries, Muckleshoot Indian Tribe Melissa Calvert, Muckleshoot Cultural Resources Program Gretchen Kaehler, Office of Archaeology & Historic Preservation Ramin Pazooki, WSDOT, NW Region Larry Fisher, WDFW Duwamish Tribal Office US Army Corp. of Engineers 1055 South Grady Way, Renton, WA 98057 • rentonwa.gov DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT ENVIRONMENTAL (SEPA) DETERMINATION OF NON -SIGNIFICANCE (DNS) PROJECT NUMBER: LUA 16-000658, ECF APPLICANT: City of Renton PROJECT NAME: Low Impact Development (LID) Code Revisions PROJECT DESCRIPTION: The applicant is requesting Environmental (SEPA) Review for proposed regulations to ensure City code does not serve as a barrier to the use of Low Impact Development (LID). The majority of the changes are technical. There are a handfull of policy retated changes: allowing LID facilties to be counted towards 50% of required open space, allow excess parking if LID is used, reduce a small portion of the required landscaping in the Automall if LID is used, and allowing varied standards for low traffic volume streets where LID is incoorporated. These regulations would be citywide. PROJECT LOCATION: Citywide LEAD AGENCY: City of Renton Environmental Review Committee Department of Community & Economic Development The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse impact on the environment. An Environmental Impact Statement (EIS) is not required under RCW 43.21C.030 (2)(c). This Determination of Non -Significance is issued under WAC 197-11-340. Because other agencies of jurisdiction may be involved, the lead agency will not act on this proposal for fourteen (14) days. Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on September 9, 2016. Appeals must be filed in writing together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed by RMC 4-8-110 and more information may be obtained from the Renton City Clerk's Office, (425) 430-6510. PUBLICATION DATE: DATE OF DECISION: SIGNATURES: Gregg mG rm , Administrator gg Public Wor s epartment elly Beymer, Administrator Community Services Department September 2, 2016 August 29, 2016 /61/( Date ark Peterson, Administrator re & Emergency Services -//p C. 2. \J. Date C.E. "Chip" Vincent, Administrator Department of Community & Economic Development 6/0-1 Date (2/(1'4 Date Teri Svedahl From: Teri Svedahl Sent: Friday, August 19, 2016 11:33 AM To: 'ECY RE SEPA REGISTER'; 'sepaunit@ecy.wa.gov' Subject: City of Tukwila NOA Attachments: E16-0008.pdf Attached is a NOA for the City of Tukwila; KC Surface Water Design Manual and proposed related TMC. If you have any questions, please contact the project planner, Moira Bradshaw, at maina.br-adshaw(c tukwilawa.gov Have a great weekend Teri Land Use and Sign application intake hours are: M — F, 8:00 — 12:00 & 2:00 — 4:00 Teri Svedahl /Administrative Support Technician City of Tukwila I Planning Department 6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188 Teri.SvedahlTukwila WA.gov SiONAL Respraseve The City of opportunity, the community of choice. ** NOTICE OF PUBLIC DISCLOSURE: This e-mail account is public domain. Any correspondence from or to this e-mail account is a public record. Accordingly, this e-mail, in whole or in part, may be subject to disclosure pursuant to RCW 42.56, regardless of any claim of confidentiality or privilege asserted by an external party.** 1 Surface Water Low Impact Development Open House Wednesday, August 10, 2016 6:30 PM — 8:00 PM Tukwila Community Center, Meeting Room "A" 12424 42nd Ave. South Sign In Name Address email /21)441-&46 .034 (S}'.'St '"Jcx4 rd.040/1 �� Imo-^ A IY1;4 Alike. Ttt Lola, Lull 116o2, Lir Ave S aJm \G.2__ o-4vvtaii, caw 7)71/. 1 .-11'iC. 1'3CCAD 5 3 S e2 c` c-"f e GiGoD • - ,:..,..:.., ra: - . _ ,,,,..........::-,..,:-..,::,.; giii, -kitool./ /. TTTT f vy' A. 4.001 kvt" '1 y o-H OF ENVIRONMENTAL DETERMINATION ISSUANCE OF A DETERMINATION OF NONSIGNIFICANCE (DNS) POSTED TO NOTIFY INTERESTED PERSONS OF AN ENVIRONMENTAL ACTION PROJECT NAME: Low Impact Development (LID) Code Revisions PROJECT NUMBER: LUA16-000658, ECF LOCATION: Citywide Description: THE APPLICANT IS REQUESTING ENVIRONMENTAL (SEPA) REVIEW FOR PROPOSED REGULATIONS TO ENSURE CITY CODE DOES NOT SERVE AS A BARRIER TO THE USE OF LOW IMPACT DEVELOPMENT (LID). THE MAJORITY OF THE CHANGES ARE TECHNICAL. THERE ARE A HANDFULL OF POLICY RETATED CHANGES: ALLOWING LID FACILTIES TO BE COUNTED TOWARDS 50% OF REQUIRED OPEN SPACE, ALLOW EXCESS PARKING IF LID IS USED, REDUCE A SMALL PORTION OF THE REQUIRED LANDSCAPING IN THE AUTOMALL IF LID IS USED, AND ALLOWING VARIED STANDARDS FOR LOW TRAFFIC VOLUME STREETS WHERE LID IS INCOORPORATED. THESE REGULATIONS WOULD BE CITYWIDE. THE CITY OF RENTON ENVIRONMENTAL REVIEW COMMITTEE (ERC) HAS DETERMINED THAT THE PROPOSED ACTION DOES NOT HAVE A SIGNIFICANT ADVERSE IMPACT ON THE ENVIRONMENT. Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on September 16, 2016, together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057. Appeals to the Examiner are governed by City of RMC 4-8-110 and information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425) 430-6510. IF THE ENVIRONMENTAL DETERMINATION IS APPEALED, A PUBLIC HEARING WILL BE SET AND ALL PARTIES NOTIFIED. FOR FURTHER INFORMATION, PLEASE CONTACT THE CITY OF RENTON, DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT AT (425) 430-7200. DO NOT REMOVE THIS NOTICE WITHOUT PROPER AUTHORIZATION PLEASE INCLUDE THE PROJECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIFICATION.