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Home My WebLink AboutPermit D19-0182 - HOLIDAY-PARKS - STORAGE & PARKING LOTHOLIDAY -PARKS, INC 4625 S 134TH PL EXPIRED 02/11/23 D19-0182 Parcel No: Address: City of Tukwila Deportment of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Inspection Scheduling: https://tukw-egov.aspgov.com/BP/index.html Web site: http://www.TukwilaWA.gov 2613200051 4625 S 134TH PL Project Name: HOLADAY-PARKS, INC. DEVELOPMENT PERMIT Permit Number: D19-0182 Issue Date: 10/26/2020 Permit Expires On: 4/24/2021 Owner: Name: Address: Contact Person: Name: Address: Contractor: Name: BC & G LLC 4600 S 134TH PL , SEATTLE, WA, 98168 DAVE SEGAL Phone: (425) 654-8768 1180 NW MAPLE ST, STE 160 , ISSAQUAH, WA, 98027 HOLADAY PARKS INC (GENERAL) Address: 4600 S 134 PL , SEATTLE, WA, 98168 License No: HOLADPI379NO Lender: Name: HOLADAY-PARKS, INC. Address: 4625 S 134TH PL TUKWILA WA 98168 Phone: (206) 248-9700 Expiration Date: 9/3/2021 DESCRIPTION OF WORK: CONSTRUCT APPROXIMATELY 240 SQUARE FOOT STORAGE BUILDING AND ACCESSORY FIVE -SPACE PARKING LOT. PUBLIC WORKS ACTIVITIES INCLUDE EROSION CONTROL, STORM DRAINAGE, RERMEABLE PARKING PAVEMENT, WATER SERVICE/IRRIGATION DOWNSTREAM OF DCVA. EXISTING WM IS WD #125 WM; DCVA, REQUIRED WD #125 INSPECTION. Project Valuation: $24,609.60 Fees Collected: $7,728.05 Type of Fire Protection: Sprinklers: NO Fire Alarm: NO Type of Construction: IIB Electrical Service Provided by: Tukwila Occupancy per IBC: S-1 Water District: 125 Sewer District: Valley View Current Codes adopted by the City of Tukwila: International Fire Code Edition: International Building Code Edition: International Residential Code Edition: International Mechanical Code Edition: Uniform Plumbing Code Edition: International Fuel Gas Code: 2015 2015 2015 2015 2015 2015 National Electrical Code: WA Cities Electrical Code: WAC 296-46B: WA State Energy Code: 2017 2017 2017 2015 Public Works Activities: Channelization/Striping: Curb Cut/Access/Sidewalk: Fire Loop Hydrant: Flood Control Zone: Hauling/Oversize Load: Land Altering: Landscape Irrigation: Sanitary Side Sewer: Sewer Main Extension: Storm Drainage: Street Use: Water Main Extension: Water Meter: Volumes: Cut: 100 Fill: 0 Number: 0 No All provisions of law and ordinances governing this work will be complied with, whether specified herein or not. The granting of this permit does not presume to give authority to violate or cancel the provisions of any other state or local laws regulating construction or the performance of work. This permit shall become null and void if the work is not commenced within 180 days for the date of issuance, or if the work is suspended or abandoned for a period of 180 days from the last inspection. PERMIT CONDITIONS: 1: ***BUILDING PERMIT CONDITIONS*** 2: Work shall be installed in accordance with the approved construction documents, and any changes made during construction that are not in accordance with the approved construction documents shall be resubmitted for approval. 3: All permits, inspection record card and approved construction documents shall be kept at the site of work and shall be open to inspection by the Building Inspector until final inspection approval is granted. 4: Truss shop drawings shall be provided with the shipment of trusses delivered to the job site. Truss shop drawings shall bear the seal and signature of a Washington State Professional Engineer. Shop drawings shall be maintained on the site and available to the building inspector for inspection purposes. 5: All construction shall be done in conformance with the Washington State Building Code and the Washington State Energy Code. 6: Notify the City of Tukwila Building Division prior to placing any concrete. This procedure is in addition to any requirements for special inspection. 7: There shall be no occupancy of a building until final inspection has been completed and approved by Tukwila building inspector. No exception. 8: All plumbing and gas piping work shall be inspected and approved under a separate permit issued by the City of Tukwila Building Department (206-431-3670). 9: All electrical work shall be inspected and approved under a separate permit issued by the City of Tukwila Permit Center. 10: VALIDITY OF PERMIT: The issuance or granting of a permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of the building code or of any other ordinances of the City of Tukwila. Permits presuming to give authority to violate or cancel the provisions of the code or other ordinances of the City of Tukwila shall not be valid. The issuance of a permit based on construction documents and other data shall not prevent the Building Official from requiring the correction of errors in the construction documents and other data. 11: All mechanical work shall be inspected and approved under a separate permit issued by the City of Tukwila Permit Center (206/431-3670). 15: The total number of fire extinguishers required for an ordinary hazard occupancy with Class A fire hazards is calculated at one extinguisher for each 1,500 sq. ft. of area. The extinguisher(s) should be of the "All Purpose" (3A, 40B:C) dry chemical type. Travel distance to any fire extinguisher must be 75' or less. (IFC 906.3) (NFPA 10, 5.4) 12: Portable fire extinguishers, not housed in cabinets, shall be installed on the hangers or brackets supplied. Hangers or brackets shall be securely anchored to the mounting surface in accordance with the manufacturer's installation instructions. Portable fire extinguishers having a gross weight not exceeding 40 pounds (18 kg) shall be installed so that its top is not more than 5 feet (1524 mm) above the floor. Hand- held portable fire extinguishers having a gross weight exceeding 40 pounds (18 kg) shall be installed so that its top is not more than 3.5 feet (1067 mm) above the floor. The clearance between the floor and the bottom of the installed hand-held extinguishers shall not be less than 4 inches (102 rrm). (IFC 906.7 and IFC 906.9) 13: Extinguishers shall be located in conspicuous locations where they will be readily accessible and immediately available for use. These locations shall be along normal paths of travel, unless the fire code official determines that the hazard posed indicates the need for placement away from normal paths of travel. (IFC 906.5) 14: Fire extinguishers require monthly and yearly inspections. They must have a tag or label securely attached that indicates the month and year that the inspection was performed and shall identify the company or person performing the service. Every six years stored pressure extinguishers shall be emptied and subjected to the applicable recharge procedures. If the required monthly and yearly inspections of the fire extinguisher(s) are not accomplished or the inspection tag is not completed, a reputable fire extinguisher service company will be required to conduct these required surveys. (NFPA 10, 7.2, 7.3) 16: Contact The Tukwila Fire Prevention Bureau to witness all required inspections and tests. (City Ordinances #2436 and #2437) 17: Any overlooked hazardous condition and/or violation of the adopted Fire or Building Codes does not imply approval of such condition or violation. 18: These plans were reviewed by Inspector 511. If you have any questions, please call Tukwila Fire Prevention Bureau at (206)575-4407. 19: ***PUBLIC WORKS PERMIT CONDITIONS*** 20: Call to schedule mandatory pre -construction meeting with the Public Works Inspector, (206) 438-9350. 21: The applicant or contractor must notify the Public Works Inspector at (206) 438-9350 upon commencement and completion of work at least 24 hours in advance. All inspection requests for utility work must also be made 24 hours in advance. 22: Prior to construction, all utilities in the vicinity shall be field located. NOTE: For City of Tukwila utility locates, call 811 or 1-800-424-5555. 23: Permit is valid between the weekday hours of 7:00 a.m. and 5:00 p.m. only. Coordinate with the Public Works Inspector for any work after 5:00 p.m. and weekends. 24: No work under this permit during weekend hours without prior approval by Public Works. Coordinate with the Public Works Inspector. 25: Work affecting traffic flows shall be closely coordinated with the Public Works Inspector. Traffic Control Plans shall be submitted to the Inspector for prior approval. 26: The City of Tukwila has an undergrounding ordinance requiring the power, telecommunications, and cable service lines be underground from the point of connection on the pole to the house. 27: Flagging, signing and coning shall be in accordance with MUTCD for Traffic Control. Contractor shall provide certified flagmen for traffic control. Sweep or otherwise clean streets to the satisfaction of Public Works each night around hauling route (No flushing allowed). Notify Public Works Inspector before 12:00 Noon on Friday preceding any weekend work. 28: Any material spilled onto any street shall be cleaned up immediately. 29: Temporary erosion control measures shall be implemented as the first order of business to prevent sedimentation off -site or into existing drainage facilities. 30: The site shall have permanent erosion control measures in place as soon as possible after final grading has been completed and prior to the Final Inspection. 31: The Land Altering Permit Fee is based upon an estimated 100 cubic yards of excavation. If contamination is detected, the land altering quantity and permit fee will change. The applicant will be required to calculate final quantities and pay the difference in permit fee prior to the Final Inspection. 32: From October 1 through April 30, cover any slopes and stockpiles that are 3H:1V or steeper and have a vertical rise of 10 feet or more and will be unworked for greater than 12 hours. During this time period, cover or mulch other disturbed areas, if they will be unworked more than 2 days. Covered material must be stockpiled on site at the beginning of this period. Inspect and maintain this stabilization weekly and immediately before, during and following storms. 33: From May 1 through September 30, inspect and maintain temporary erosion prevention and sediment at least monthly. All disturbed areas of the site shall be permanently stabilized prior to final construction approval. 34: The property owner is responsible for the maintenance of its storm drainage system and, for this purpose, shall have a maintenance plan in place and the responsibility for maintenance assigned prior to Public Works final. 35: All double check valve assemblies shall be approved by the State Department of Health. 36: The DCVA downstream of ex. WD #125 water meter requires WD#125 Inspection. PERMIT INSPECTIONS REQUIRED Permit Inspection Scheduling: https://tukw-egov.aspgov.com/BP/index.html 5170 BACKFLOW -IRR 1700 BUILDING FINAL** 0301 CONCRETE SLAB 5000 CURB ACCESS SDW 5200 EROSION MEASURES 5210 EROSION MEASURES FNL 0201 FOOTING 0409 FRAMING 5040 LAND ALTERING 5060 LANDSCAPE IRRIGATION 5230 PAVING AND RESTORE 1500 PLANNING FINAL 1600 PUBLIC WORKS FINAL 5160 PUBLIC WORKS PRE -CON 0401 ROOF SHEATHING 5090 STORM DRAINAGE 0413 WALL SHEATHING_SHEAR CITY OF TUKWILA Community Development Department Public Works Department Permit Center 6300 Southcenter Blvd, Suite 100 Tukwila, WA 98188 http://www.TukwilaWA.gov Building Permit No. ) - d1 p 7i Project No. Date Application Accepted: (9 5 ~ I CA Date Application Expires: 12.. - V (For office use only) CONSTRUCTION PERMIT APPLICATION Applications and plans must be complete in order to be accepted for plan review. Applications will not be accepted through the mail or by fax. **Please Print** SITE LOCATION King Co Assessor's Tax No.: 2613200051 Site Address: 4625 S 134th P1, Tukwila, WA 98168 Tenant Name: Holaday-Parks, Inc. Suite Number: PROPERTY OWNER Name: BC & G LLC Address: 4600 S 134th P1 City: Seattle State: WA Zip: 98168 CONTACT PERSON — person receiving all project communication Name: Dave Segal Address: 1180 NW Maple St, Ste 160 City: Issaquah State: WA Zip: 98027 Phone: (425) 654-8768 Fax: Email: dave.segal@pbsusa.com GENERAL CONTRACTOR INFORMATION Company Name: Address: City: State: Zip: Phone: Fax: Contr Reg No.: Exp Date: Tukwila Business License No.: New Tenant: Floor: 0 Yes ❑ ..No ARCHITECT OF RECORD Company Name: Architect Name: Address: City: State: Zip: Phone: Fax: Email: ENGINEER OF RECORD Company Name: PBS Engineering and Environmental I Engineer Name: Dave Segal Address: 1180 NW Maple St, Ste 160 City: Issaquah State: WA Zip: 98027 Phone: (425) 654-8767 Fax: Email: dave.segal@pbsusa.com LENDER/BOND ISSUED (required for projects $5,000 or greater per RCW 19.27.095) Name: \\ (�\ n-)- y Address:LA6(� L. / \20c\.� \ \ck City:I ► 4% State E Zipc`b H:Wpplications\Forms-Applications On Line\2011 ApplicationsU'ermit Application Revised - 8-9-11.docx Revised: August 2011 bh Page 1 of 4 • BUILDING PERMIT INFORMATION — 206-431-3670 Valuation of Project (contractor's bid price): $ - \, bc(:)\ Existing Building Valuation: $ 0 Describe the scope of work (please provide detailed information): Construct approximately 240-square-foot storage building and accessory five -space parking lot. Will there be new rack storage? ❑ Yes ❑.. No If yes, a separate permit and plan submittal will be required. Provide All Building Areas in Square Footage Below Existing Interior Remodel Addition to Existing Structure New Type of Construction per IBC Type of Occupancy per IBC lst Floor 0 240 II-B S-1 2nd Floor 3rd Floor Floors thru Basement Accessory Structure* Attached Garage Detached Garage Attached Carport Detached Carport Covered Deck Uncovered Deck PLANNING DIVISION: Single family building footprint (area of the foundation of all structures, plus any decks over 18 inches and overhangs greater than 18 inches) *For an Accessory dwelling, provide the following: Lot Area (sq ft): Floor area of principal dwelling: Floor area of accessory dwelling: *Provide documentation that shows that the principal owner lives in one of the dwellings as his or her primary residence. Number of Parking Stalls Provided: Standard: 4 Compact: Handicap: 1 Will there be a change in use? ❑ Yes No If "yes", explain: FIRE PROTECTION/HAZARDOUS MATERIALS: ❑ Sprinklers ❑ Automatic Fire Alarm • None ❑ Other (specify) Will there be storage or use of flammable, combustible or hazardous materials in the building? ❑ Yes SI, No If `yes', attach list of materials and storage locations on a separate 8-1/2"x 11 " paper including quantities and Material Safety Data Sheets. SEPTIC SYSTEM ❑ On -site Septic System — For on -site septic system, provide 2 copies of a current septic design approved by King County Health Department. H:\Applications\Forms-Applications On Line\2011 Applications\Permit Application Revised - 8-9-11.docx Revised: August 2011 bh Page 2 of 4 PUBLIC WORKS PERMIT INFORMATION — 206-433-0179 Scope of Work (please provide detailed information): Construct a one-story, 240-square-foot storage building and accessory five -space parking lot. Call before you Dig: 811 Please refer to Public Works Bulletin #1 for fees and estimate sheet. Water District ...Tukwila ❑ ... Water District #125 ❑ ...Water Availability Provided Sewer District ❑ ...Tukwila ❑ ...Sewer Use Certificate ❑ .. Highline ❑ .. Renton ❑...Valley View ❑ .. Renton ❑ ...Sewer Availability Provided ❑ .. Seattle Septic System: ❑ On -site Septic System — For on -site septic system, provide 2 copies of a current septic design approved by King County Health Department. Submitted with Application (mark boxes which apply): ..• .Civil Plans (Maximum Paper Size — 22" x 34") ..• .Technical Information Report (Storm Drainage) ❑ ...Bond ❑ .. Insurance ❑ .. Easement(s) Proposed Activities (mark boxes that apply): ❑ ...Right-of-way Use - Nonprofit for less than 72 hours ❑ ...Right-of-way Use - No Disturbance ❑ ...Construction/Excavation/Fill - R.ight-of-way ❑ Non Right-of-way 0 m ...Total Cut ® ...Total Fill cubic yards cubic yards ® .. Geotechnical Report ❑ .. Maintenance Agreement(s) ❑ ... Traffic Impact Analysis ❑ ...Hold Harmless — (SAO) 0 ...Hold Harmless — (ROW) ❑ .. Right-of-way Use - Profit for less than 72 hours ❑ .. Right-of-way Use — Potential Disturbance ❑ .. Work in Flood Zone .. • Storm Drainage ❑ ...Sanitary Side Sewer ❑ .. Abandon Septic Tank 0 .. Grease Interceptor ❑ ...Cap or Remove Utilities 0 .. Curb Cut 0 .. Channelization ❑ ...Frontage Improvements ❑ .. Pavement Cut 0 .. Trench Excavation 0 ...Traffic Control 0 .. Looped Fire Line ❑ .. Utility Undergrounding ❑ ...Backflow Prevention - Fire Protection Irrigation " Domestic Water 33 m ...Permanent Water Meter Size... WO # ❑ ...Temporary Water Meter Size .. WO # 0 ...Water Only Meter Size WO # 0 ...Deduct Water Meter Size ❑ ...Sewer Main Extension Public ❑ Private 0 ® ...Water Main Extension Public m Private 0 53 FINANCE INFORMATION Fire Line Size at Property Line Number of Public Fire Hydrant(s) 0 ...Water El ...Sewer 0 ...Sewage Treatment Monthly Service Billing to: Name: Day Telephone: Mailing Address: Water Meter Refund/Billing: Name: Mailing Address: City State Zip Day Telephone: City State Zip H:Wpplications\Forms-Applications On Line\2011 Applications\Permit Application Revised - S-9-11.docx Revised: August 2011 bh Page 3 of 4 PERMIT APPLICATION NOTES — Value of Construction — In all cases. a value of construction amount should be entered by the applicant. This figure will be reviewed and is subject to possible revision by the Permit Center to comply with current fee schedules. Expiration of Plan Review — Applications for which no permit is issued within 180 days following the date of application shall expire by limitation. The Building Official may grant one or more extensions of time for additional periods not exceeding 90 days each. The extension shall be requested in writing and justifiable cause demonstrated. Section 105.3.2 International Building Code (current edition). I HEREBY CERTIFY THAT I HAVE READ AND EXAMINED THIS APPLICATION AND KNOW THE SAME TO BE TRUE UNDER PENALTY OF PERJURY BY THE LAWS OF THE STATE OF WASHINGTON, AND I AM AUTHORIZED TO APPLY FOR THIS PERMIT. BUILDING OWN AUT _ 1 RIZED AGENT; Signature: Print Name: Dave Segal Mailing Address: 1180 NW Maple St, Ste 160 Date: �/3�/ Day Telephone: (425) 654-8768 Issaquah WA 98027 City State Zip H:\Applications\Forms-Applications On Line \2011 Applications\Permit Application Revised - 8-9-1 ].docx Revised: August 2011 bh Page 4 of 4 BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees PROJECT NAME PERMIT# If you do not provide contractor bids or an engineer's estimate with your permit application, Public Works will review the cost estimates for reasonableness and may adjust estimates. 1. APPLICATION BASE FEE 2. Enter total construction cost for each improvement category: Mobilization 100 Erosion prevention Water/Sewer/Surface Water Road/Parking/Access A. Total Improvements \ (IA —Th{ 3. Calculate improvement -based fees: B. 2.5% of first $100,000 of A. C. 2.0% of amount over $100,000, but less than $200,000 of A. D. 1.5% of amount over $200,000 of A. 4. TOTAL PLAN REVIEW FEE (B+C+D) 5. Enter total excavation volume Enter total fill volume cubic yards cubic yards $250 (1) Use the following table to estimate the grading plan review fee. Use the reater of the excavation and fill volumes. QUANTITY IN CUBIC YARDS RATE Up to 50 CY Free 51 —100 $23.50 101 —1,000 $37.00 1,001 — 10,000 $49.25 10,001 — 100,000 $49.25 for 1ST 10,000, PLUS $24.50 for each additional 10,000 or fraction thereof. 100,001 — 200,000 $269.75 for 1ST 100,000, PLUS $13.25 for each additional 10,000 or fraction thereof. 200,001 or more $402.25 for 1ST 200,000, PLUS $7.25 for each additional 10,000 or fraction thereof. GRADING Plan Review Fees TOTAL PLAN REVIEW FEE DUE WITH PERMIT APPLICATION (1+4+5) $ (4) (5) The Plan Review and Approval fees cover TWO reviews: 1) the first review associated with the submission of the application/plan and 2) a follow-up review associated with a correction letter. Each additional review, which is attributable to the Applicant's action or inaction shall be charged 25% of the Total Plan Review Fee. RECEIVED CITY OF TUK IL. Approved 09.25.02 Last Revised 01.01.19 1 lq- AIN 05 `019 �dt,; PERMIT CENTER 1LA Cash Register Receipt City of Tukwila Receipt Number R17814 DESCRIPTIONS PermitTRAK ACCOUNT QUANTITY PAID $396.25 D19-0182 Address: 4625 S 134TH PL Apn: 2613200051 $396.25 Credit Card Fee $11.54 Credit Card Fee R000.369.908.00.00 0.00 $11.54 DEVELOPMENT $384.71 PLAN CHECK FEE TOTAL FEES PAID BY RECEIPT: R17814 R000.345.830.00.00 0.00 $384.71 $396.25 Date Paid: Wednesday, June 05, 2019 Paid By: CONNIE HARDIN Pay Method: CREDIT CARD 09208G Printed: Wednesday, June 05, 2019 11:29 AM 1 of 1 SYSTEMS CO TUKWILA ETRAKIT 6200 SOUTHCENTER BLVD TUKWILA, WA 98188 206-433-1870 CITY OF TUKWILA Date: 06/05/2019 11:28:40 AM CREDIT CARD SALE VISA CARD NUMBER: **********1947 K TRAN AMOUNT: $396.25 APPROVAL CD: 09208G RECORD #: 000 CLERK ID: kandace Thank you! Customer Copy 11.E Memorandum DATE: TO: FROM: PBS PROJECT: CODE` COMPLIANCE APPROVED OCT 06 2020 City of Tukwila BUILDING DIVISION August 17, 2019 Joanna Spenser, Development Engineer, City of Tukwila Public Works Patrick J. Togher, PWS 41492.000 REGARDING: Development Permit Application Number D19-0182 Response to Review Comments PBS RECEIVED SEt' Z 1 206 TUKWILA PUBLIC WORKS This memo provides our responses to the City of Tukwila's comments dated August 3, 2020. Revised submittal materials incorporating the changes are attached. PLANNING DEPARTMENT COMMENTS (Meredith Sampson) Comment 1 CORRECTION LTR# Applicant applied for building permit prematurely. Must wait for L19-0059 and L19-0060 to be issued before issuance of building permit. Per communication with Meredith Sampson, final approval has been given for the buffer reduction and design review. Comment 2 Show landscaping per what was approved under L19-0059 and L19-0060. Current plan drawings show the landscaping approved under L19-0059 and L19-0060. RECEIVED CITY OF TUKWILA SEP 14 2020 PERMIT CENTER PUBLIC WORKS COMMENTS (Joanna Spencer) Comment 1 Land Use permits are still pending. Final approval has been given for the buffer reduction and design review. Comment 2 Submit a Technical Information Report that outlines how the project conforms to the 2016 King County Surface Water Design Manual. A Technical Information Report (TIR) for the project was provided in the October 2019 resubmittal. Two additional copies have been attached for your convenience. Comment 3 Storm Drainage note #2 on sheet C-002 shall refer to KC Surface Water Design Manual 2016 edition. Sheet C-002 has been revised accordingly. Two copies of the revised drawing are attached. 1� -o �ei-- 1180 NW MAPLE STREET, SUITE 160, ISSAQUAH, WA 98027 • 425.654.877 AIN • 866.727.0140 FAX • PBSUSA.COM Joanna Spenser, Development Engineer, City of Tukwila Public Works Development Permit D19-0182 Holaday-Parks, Inc. Response to Review Comments August 17, 2020 Page 2 Comment 4 The PBS Memo states that the existing site condition is gravel paving. It is my understanding that this gravel was placed on the site without a permit following the demolition of the residential house previously on site. A similar comment from the City was addressed in the in October 2019 resubmittal. We have provided that comment and the response below. The PBS Memo states that the existing site condition is gravel paving. It is my understanding that this gravel was placed on the site without a permit following the demolition of the residential house previously on the site. Since this was not an original dote condition, please model the existing site as what existed when the site was used as a single-family residence. The model results in the TIR are based on the development condition of the site in 1979 per definition of "Existing site conditions" in the King County Stormwater Design Manual. In 1979, the site was developed with a residential structure and a driveway. Comment 5 The planned dispersion trench appears to be approximately 30-ft from the property line. Typically, a dispersion trench should have a 100-ft flow path. A similar comment from the City was addressed in the in October 2019 resubmittal. We have provided that comment and the response below. The planned dispersion trench appears to be approximately 30' from the property line. Typically, a dispersion trench should have a 100' flow path per the 2016 King County Surface Water Design Manual. Please update the plans to conform to the manual requirements or justify why the shorter flow path is acceptable in this situation. The available space, site topography, and nearby stream and wetland limit the design of the dispersion trench, and do not allow for a flow path longer than 30 feet. Although these constraints limit the flow path to less than 100 feet, the dispersion trench still functions to disperse the relatively minor runoff into the buffer area where it will eventually make it to the creek as either sheet flow or interflow. Comment 6 Permeable pavement is proposed within the vehicle parking stalls. The TIR should demonstrate that the soil conditions of this site meet the requirement of permeable pavement. A similar comment from the City was addressed in the in October 2019 resubmittal. We have provided that comment and the response below. Permeable pavement is proposed within the vehicle parking stalls. The TIR should demonstrate that the soil conditions of this site meet the requirements of permeable pavement. Per and approval of City Engineer Ryan Larson, a geotechnical soil texture analysis will be performed to determine a design infiltration rate. The information from the analysis will demonstrate the site meets the requirements of permeable pavement. The investigations for the soil texture analysis are currently underway, and the results will be provided to the City as a follow-up amendment to this submittal. 41492.000 S f Joanna Spenser, Development Engineer, City of Tukwila Public Works Development Permit D19-0182 Holaday-Parks, Inc. Response to Review Comments August 17, 2020 Page 3 (08-05-20) Note that the geotechnical soil texture analysis was completed by PBS staff in October 2019. The results indicate that the soils have Ksat Value of 1.92 in/hr and a design value of 0.7 in/hr with a correction actor of 0.36. Refer to the Geotechnical report for more information. A permeable pavement was used because of the Onsite LID conditions. Comment 7 A Hydraulic Permit Application (HPA) from the Dept. of Fisheries is required if the stream along S 134th Place is disturbed. A similar comment from the City was addressed in the in October 2019 resubmittal. We have provided that comment and the response below. A Hydraulic Permit Application (HPA) from the Department of Fisheries will be needed if the stream along S 134th Place is disturbed. The proposed improvements will not alter the bed or bank of East Fork Southgate Creek. Therefore, an HPA will not be required. Comment 8 Applicant shall contact WD #125 for approval of irrigation water connection and associated irrigation Double Check Valve Assembly (DCVA). The District might have their own notes and DCVA detail. PBS contacted David Brower at WD#125 for approval of irrigation water connection and associated irrigation Double Check Valve Assembly (DCVA). He in indicated that as long the as long as the device is on the Washington state DOH certified list, the device can be used for backflow protection. A copy of the email is attached. Comment 9 The property owner shall execute with notary a Sensitive Area Hold Harmless agreement due to presence of steep slopes on site. This document will be recorded against the parcel at the property owner's expense. We understand the City will provide documentation for the applicant to execute. We hope this has been responsive to your request for correction. Attachments: Technical Information Report (TIR): 2 copies Memorandum: Geotechnical Engineering Services — Infiltration Rate: 2 copies Revised Engineering Plans (Sheet C-002): 2 wet -signed copies Email Communication with David Brower, WD 125, Dated Aug 10, 2020. 2 copies cc: Bart Collins, Holaday Parks, Inc. PT:DAS:Ic 41492.000 October 24, 2019 Bart Collins Holaday-Parks, Inc. 4600 S. 134th Place Tukwila, Washington 98168 FILE Via email: bartc@holadayparks.com Regarding: Geotechnical Engineering Services — Infiltration Rate Holaday-Parks Parking Lot 4625 S. 134th Place Tukwila, Washington PBS Project 41492.005 Dear Mr. Collins: PBS RECEIVED SEP 12020 TUKWILA PUBLIC WORKS CITY OF TUKWILA SEP 14 2020 PERMIT CENTER PBS Engineering and Environmental Inc. (PBS) is pleased to submit this letter report to Holaday-Parks, Inc., regarding our geotechnical engineering services for the planned parking lot at 4625 S 134th place in Tukwila, Washington. PROJECT UNDERSTANDING PBS understands that the project design includes permeable pavement in a small area located in the upper area of the proposed basin. The City of Tukwila (City) issued a permit application correction letter dated July 17, 2019, requesting that the designer demonstrate that the on -site soils meet the requirements for permeable pavements. The City accepted the design engineer's suggestion to conduct soil texture analyses to develop a design CORRE TION infiltration rate as an alternative to full-scale infiltration testing. LTR# SCOPE OF SERVICES PBS' services included developing an infiltration rate for the subgrade beneath the proposed new permeable pavement for the planned parking lot. This was accomplished by performing the following scope of services. Geologic Map Review Geologic maps of the site area were reviewed for information regarding geologic conditions at or near the site. Subsurface Exploration PBS explored subsurface conditions by completing one hand -dug exploration in the area of planned permeable pavement to a depth of 4.5 feet below the existing ground surface (bgs) and collecting grab soil samples for laboratory testing. Soils Testing Soil samples were returned to our laboratory and classified in general accordance with the Unified Soil Classification System (ASTM D2487) and/or the Visual -Manual Procedure (ASTM D2488). Laboratory tests included natural moisture contents and grain -size analyses. Laboratory test results are included in the attached Figure B1, Particle -Size Analysis Test Results. 9y\--okr)---" 214 E GALER STREET, SUITE 300, SEATTLE, WA 98102 • 206.233.9639 MAIN • 866.727.0140 FAX • PBSUSA.COM Holaday-Parks Parking Lot Geotechnical Engineering Services —Infiltration Rate October 24, 2019 Page 2 of 5 Geotechnical Engineering Analyses The data collected during soil sampling and laboratory testing were analyzed to develop a design infiltration rate. Deliverable This geotechnical engineering letter report contains the results of our services, including the following information: • Field exploration log and site plan showing approximate exploration location • Laboratory test results • Estimated in -situ and design infiltration rates SITE CONDITIONS The rectangular -shaped site is bordered by S. 134th Place on the northeast, the Analytical Resources Inc. building and parking lot on the northwest, an undeveloped grass -covered field on the southeast, and residential buildings and large trees on the southwest. The site is currently occupied by a single structure and includes both paved and gravel parking areas. Site topography is relatively flat, sloping gently to the north at an elevation between 40 feet above mean sea level (amsl) on the south side and 26 feet amsl on the north side. Geologic Setting Review of the Washington Geologic Information Portal (DNR) shows the site is mapped as underlain by Pleistocene continental glacial drift, which is described as Pleistocene till and outwash clay, silt, sand, gravel, cobbles, and boulders deposited by or originated from continental glaciers; locally this includes peat, non -glacial sediments, modified land, and artificial fill. Subsurface Conditions Subsurface conditions at the site interpreted from one hand -dug exploration include primarily sandy lean clay (approximately 60 percent clay and silt) with gravel (approximately 10 percent). Site Soils _r, i The site was explored by one hand -dug excavation, designated HA-1, to a depth of approximately 4.5 feet bgs. The excavation was performed by PBS staff. Subsurface conditions were documented, and representative soil samples of each discrete layer were collected. PBS conducted grain -size analysis including a hydrometer test on collected samples. The exploration log and summary of testing results are included in the attachments. PBS has summarized the subsurface units as follows: SILTY SAND WITH GRAVEL: SANDY LEAN CLAY (CL) WITH GRAVEL: Gray silty sand was encountered from the ground surface to 2.0 feet bgs. The silty sand is non -plastic, fine to coarse, with subrounded gravel and cobbles. Light brown sandy lean clay with red mottles, subrounded gravel, and cobbles was encountered from 2.0 feet bgs to 4.5 feet bgs. The soil is medium plastic, moist, and contains fine- to coarse- grained sand. Groundwater Groundwater was not encountered during our exploration completed on October 2, 2019. Please note that groundwater levels can fluctuate during the year depending on climate, irrigation season, extended periods of precipitation, drought, and other factors. Based on a review of regional groundwater logs provided by the 41492.005 Holaday-Parks Parking Lot Geotechnical Engineering Services — Infiltration Rate October 24, 2019 Page 3 of 5 Washington Department of Ecology (WDE), we anticipate that the static groundwater level is present at a depth of more than 20 feet bgs.1 INFILTRATION RESULTS PBS followed the procedure presented in the Stormwater Management Manual for Western Washington (SWMMWW)2 to establish a design infiltration rate using the Massmann method (2003). The Massmann method is an empirical equation to estimate initial saturated hydraulic conductivity (Ksat) in cm/sec using grain -size analysis results as follows: Login (Ksat) = -1.57 +1.90 * Dio + 0.015 * D6o - 0.013 * D90 - 2.08 * ff;,,es Where, Dio Grain size in mm for 10% of the sample passing D60 Grain size in mm for 60% of the sample passing D90 Grain size in mm for 90% of the sample passing, and ffines Percent passing US Standard No. 200 sieve The SWMMWW equation for determining long-term infiltration rates (design) is: Design Saturated Hydraulic Conductivity Ksat design = Ksat * CFT Total Correction Factor, CFT = CFv x CFt x CFm For long-term design infiltration rates, the following safety (correction) factors are suggested by SWMMWW: • Site variability and number of locations tested (CFv). The range of CFv is from 0.33 to 1.0. We assumed CFv=1 based on the small size of permeable pavement and encountered soil conditions. • Uncertainty of test method (CFt). This correction factor accounts for the reliability of the test method in estimating the actual infiltration rate. For the grain -size method, the CFt =0.40, and • Degree of influent control to prevent siltation and bio-buildup (CFm). This correction factor accounts for a graduaN decrease of the initial infiltration rate and is equal to 0.90. The design infiltration rate estimated using the above listed correction factors would be: Ksat Design = CFT * Ksat = 0.36*Ksat PBS' grain -size analysis results and estimated infiltration rate are presented in Table 1. 1 State of Washington Department of Ecology (WDE). (2019). [Interactive Map]. Washington State Well Viewer. Accessed on October 2019 from https://fortress.wa.gov/ecy/wellconstruction/map/wclswebMap/default.aspx. 2 State of Washington Department of Ecology (WDE). (2019). Stormwater Management Manual for Western Washington. Accessed on October 2019 from https://fortress.wa.gov/ecy/ershare/wq/Permits/Flare/2019SWMMWW/2019SWMMWW.htm. 41492.005 Holaday-Parks Parking Lot Geotechnical Engineering Services —Infiltration Rate October 24, 2019 Page 4 of 5 Table 1. Estimated Infiltration Rate Test Location Depth (feet bgs) Dio (mm) D6o (mm) D90 (mm) ffines (%) TP-1 2.0 To 4.5 0.00039 0.09 4.76 59 Ksat (cm/sec) Ksat (in/hr) Ksat Design (in/hr)* Soil Classification Recommended Hydrologic Soil Group"* 0.001389 1.97 0.7 Sandy lean CLAY with gravel C *The recommended design infiltration rate is based on a correction factor of 0.36. **The recommended hydrologic soil group classification is based upon design infiltration rate and United States Department of Agriculture (USDA) categorizes presented in Table 2. The United States Department of Agriculture (USDA) categorizes soils in four hydrologic soil groups, A through D, and are designated mainly by particle size and hydraulic conductivity. Table 2 below shows general characteristics of each group as they are identified by the USDA. Table 2. USDA Hydrologic Soil Group Parameters3 Soil Properties A Hydrologic Soil Group Saturated Hydraulic Conductivity (k) (inches/hour) k>5.67 1.42<k<5.67 0.14<k<1.42 k<0.14 LIMITATIONS This report has been prepared for the exclusive use of the addressee, and their architects and engineers, for aiding in the design and construction of the proposed development and is not to be relied upon by other parties. It is not to be photographed, photocopied, or similarly reproduced, in total or in part, without express written consent of the client and PBS. It is the addressee's responsibility to provide this report to the appropriate design professionals, building officials, and contractors to ensure correct implementation of the recommendations. The opinions, comments, and conclusions presented in this report are based upon information derived from our literature review, field explorations, laboratory testing, and engineering analyses. It is possible that soil, rock, or groundwater conditions could vary between or beyond the points explored. If soil, rock, or groundwater conditions are encountered during construction that differ from those described herein, the client is responsible for ensuring that PBS is notified immediately so that we may reevaluate the recommendations of this report. Unanticipated fill, soil and rock conditions, and seasonal soil moisture and groundwater variations are commonly encountered and cannot be fully determined by merely taking soil samples or completing explorations such as test pits. Such variations may result in changes to our recommendations and may require additional funds for expenses to attain a properly constructed project; therefore, we recommend a contingency fund to accommodate such potential extra costs. 3 United States Department of Agriculture. (January 2009). National Engineering Handbook: Part 630.0701 Chapter 7. Washington, DC. 41492.005 Holaday-Parks Parking Lot Geotechnical Engineering Services — Infiltration Rate October 24, 2019 Page 5 of 5 The scope of work for this geotechnical letter report did not include environmental assessments or evaluations regarding the presence or absence of wetlands or hazardous substances in the soil, surface water, or groundwater at this site. If there is a substantial lapse of time between the submission of this report and the start of work at the site, if conditions have changed due to natural causes or construction operations at or adjacent to the site, or if the basic project scheme is significantGy modified from that assumed, this report should be reviewed to determine the applicability of the conclusions and recommendations presented herein. Land use, site conditions (both on and off site), or other factors may change over time and could materially affect our findings; therefore, this report should not be relied upon after three years from its issue, or in the event that the site conditions change. CLOSING We trust this letter meets your current needs. Please contact Maan Sabbagh at 206.766.7638 or maan.sabbagh@pbsusa.com with any questions or comments. Sincerely, �+- 10/24/2019 Maan Sabbagh, PE Senior Geotechnical Engineer Attachments: Figure 1. Site Plan Table A-1. Terminology Used to Describe Soil Table A-2. Key to Test Pit and Boring Log Symbols Figure Al. Log for Exploration HA-1 Figure B1. Particle -Size Analysis Test Results MS:RW:rg Reviewed By: Ryan White, PE, GE (OR) Principal/Geotechnical Engineering Group Manager 41492.005 EXPLANATION TP-1 - Test pit name and approximate location with infiltration test Sources: ESRI World Imagery Basemap 1 inch = 50 feet Feet 25 50 100 SITE PLAN HOLADAY-PARKS PARKING LOT TUKWILA, WASHINGTON DATE: OCT 2019 PROJECT: 41492.005 Table A-1 Terminology Used to Describe Soil -,,,,,, PBS 1of2 Soil Descriptions Soils exist in mixtures with varying proportions of components. The predominant soil, i.e., greater than 50 percent based on total dry weight, is the primary soil type and is capitalized in our log descriptions (SAND, GRAVEL, SILT, or CLAY). Smaller percentages of other constituents in the soil mixture are indicated by use of modifier words in general accordance with the ASTM D2488-06 Visual -Manual Procedure. "General Accordance" means that certain local and common descriptive practices may have been followed. In accordance with ASTM D2488-06, group symbols (such as GP or CH) are applied on the portion of soil passing the 3-inch (75mm) sieve based on visual examination. The following describes the use of soil names and modifying terms used to describe fine- and coarse -grained soils. Fine -Grained Soils (50% or greater fines passing 0.075 mm, No. 200 sieve) The primary soil type, i.e., SILT or CLAY is designated through visual -manual procedures to evaluate soil toughness, dilatency, dry strength, and plasticity. The following outlines the terminology used to describe fine-grained soils, and varies from ASTM D2488 terminology in the use of some common terms. Primary soil NAME, Symbols, and Adjectives Plasticity Plasticity Description Index (PI) SILT (ML & MH) CLAY (CL & CH) ORGANIC SOIL (OL & OH) SILT Organic SILT Non -plastic 0 — 3 SILT Organic SILT Low plasticity 4 —10 SILT/Elastic SILT Lean CLAY Organic SILT/ Organic CLAY Medium Plasticity 10 — 20 Elastic SILT Lean/Fat CLAY Organic CLAY High Plasticity 20 — 40 Elastic SILT Fat CLAY Organic CLAY Very Plastic >40 Modifying terms describing secondary constituents, estimated to 5 percent increments, are applied as follows: Description % Composition With Sand % Sand >_ % Gravel With Gravel % Sand < % Gravel 15% to 25% plus No. 200 Sandy % Sand >_ % Gravel <30% to 50% plus No. 200 Gravelly % Sand < % Gravel Borderline Symbols, for example CH/MH, are used when soils are not distinctly in one category or when variable soil units contain more than one soil type. Dual Symbols, for example CL-ML, are used when two symbols are required in accordance with ASTM D2488. Soil Consistency terms are applied to fine-grained, plastic soils (i.e., PI > 7). Descriptive terms are based on direct measure or correlation to the Standard Penetration Test N-value as determined by ASTM D1586-84, as follows. SILT soils with low to non -plastic behavior (i.e., PI < 7) may be classified using relative density. Consistency SPT N-value Unconfined Compressive Strength Term tsf kPa Very soft Less than 2 Less than 0.25 Less than 24 Soft 2 — 4 0.25 — 0.5 24 — 48 Medium stiff 5 — 8 0.5 — 1.0 48 — 96 Stiff 9-15 1.0 — 2.0 96-192 Very stiff 16 — 30 2.0 — 4.0 192 — 383 Hard Over 30 Over 4.0 Over 383 a PBS Table A-1 Terminology Used to Describe Soil 2 of 2 Soil Descriptions Coarse - Grained Soils (less than 50% fines) Coarse -grained soil descriptions, i.e., SAND or GRAVEL, are based on the portion of materials passing a 3-inch (75mm) sieve. Coarse -grained soil group symbols are applied in accordance with ASTM D2488-06 based on the degree of grading, or distribution of grain sizes of the soil. For example, well -graded sand containing a wide range of grain sizes is designated SW; poorly graded gravel, GP, contains high percentages of only certain grain sizes. Terms applied to grain sizes follow. Material NAME Particle Diameter Inches Millimeters SAND (SW or SP) 0.003-0.19 0.075-4.8 GRAVEL (GW or GP) 0.19-3 4.8-75 Additional Constituents: Cobble Boulder 3-12 12 —120 75 — 300 300 — 3050 The primary soil type is capitalized, and the fines content in the soil are described as indicated by the following examples. Percentages are based on estimating amounts of fines, sand, and gravel to the nearest 5 percent. Other soil mixtures will have similar descriptive names. Example: Coarse -Grained Soil Descriptions with Fines >5% to < 15% fines (Dual Symbols) z15% to < 50% fines Well graded GRAVEL with silt: GW-GM Silty GRAVEL: GM Poorly graded SAND with clay: SP-SC Silty SAND: SM Additional descriptive terminology applied to coarse -grained soils follow. Example: Coarse -Grained Soil Descriptions with Other Coarse -Grained Constituents Coarse -Grained Soil Containing Secondary Constituents With sand or with gravel >_ 15% sand or gravel With cobbles; with boulders Any amount of cobbles or boulders. Cobble and boulder deposits may include a description of the matrix soils, as defined above. Relative Density terms are applied to granular, non -plastic soils based on direct measure or correlation to the Standard Penetration Test N-value as determined by ASTM D1586-84. Relative Density Term SPT N-value Very loose 0 — 4 Loose 5 — 10 Medium dense 11— 30 Dense 31— 50 Very dense > 50 Table A-2 ........ PBS Key To Test Pit and Boring Log Symbols SAMPLING DESCRIPTIONS 1 °y o .� ca m ti �� Q ,z c�� a � o ^y Q �c 1 FQ °� mci a ¢� = Q �Q �`' Q. o y •� •ma m � Cb Q �� o c_� �. m °° � is o ct- °' Q. *� `Q. ay m t ��' �- �•sc- u)° . 4s O` 1 LOG GRAPHICS Soil N Q and Rock r ` i,,: ', :. `. i Sampling Lithology Boundary: / separates distinct units i (i.e., Fill, Alluvium, Sample Symbols Instrumentation - - Detail '—'' Ground Surface Well Cap o ce ° Bedrock) at Recovery approximate depths inciated Soil -type or Material -type , Sample Interval Well Seal Well Pipe Piezometer 76 - - - _ Change Boundary: separates soil Y ' Well N _-_ __ -- _- and material changes within the S Sampler same lithographic unit at ,�.• _•.: Screen Piezometer depth indicated 4—Bottom Hole approximate of Geotechnical Testing Acronym Explanations PP Pocket Penetrometer HYD Hydrometer Gradation TOR Torvane SIEV Sieve Gradation DCP Dynamic Cone Penetrometer DS Direct Shear ATT Atterberg Limits DD Dry Density PL Plasticity Limit CBR California Bearing Ratio LL Liquid Limit RES Resilient Modulus PI Plasticity Index VS Vane Shear P200 Percent Passing US Standard No. 200 Sieve bgs Below ground surface OC Organic Content MSL Mean Sea Level CON Consolidation HCL Hydrochloric Acid UC Unconfined Compressive Strength Details of soil and rock classification systems are available on request. Rev. 02/2017 a PBS HOLADAY PARKS PARKING LOT TUKWILA, WASHINGTON TEST PIT HA-1 PBS PROJECT NUMBER: 41492 000 APPROX. TEST PIT TP-1 LOCATION: (See Site Plan) Lat: Long: TEST PIT LOG -1 PER PAGE 41492 HAI 201.91015.GPJ PBS DATATMPL GEO.GDT PRINT DATE: 10/24/19:RPG DEPTH FEET 0.0 2.0 3.0 4.0 0 x0 0 Q J MATERIAL DESCRIPTION Lines representing the interface between soil/rock units of differing description are approximate only, inferred where between samples, and may indicate gradual transition. Gray silty SAND (SM) with gravel and cobbles; non -plastic; fine to coarse sand; fine to coarse, subrounded gravel; moist Light brown with red mottles, sandy lean CLAY (CL) with gravel and cobbles; medium plasticity; fine to coarse sand; fine to coarse, subrounded gravel; moist 5.0 — 6.0 — 7.0 — 8.0 — 9.0 — 10.0 Final depth 4.5 feet bgs. 2.0 P200 SIEV 4.5 rn 5) O DYNAMIC CONE PENETROMETER • STATIC PENETROMETER • MOISTURE CONTENT % 0 50 100 0 50 100 COMMENTS Surface Conditions: Gravel P200 = 59% LOGGED BY: M. Bagley EXCAVATED BY: PBS COMPLETED: 10/02/19 EXCAVATION METHOD: Hand Auger Page 1 of 1 FIGURE Al PRINT DATE 10/24/19:RPG 0 0 a a a q 2 ‘0_ z W PARTICLE -SIZE ANALYSIS TEST RESULTS 0 J Z 00 Z 0 • Z_ a= co ¢ p TEST METHOD: ASTM C136/D422 71 Z I- J 0 Z cn w w Z 2 0 w 2 w cn 0 0 w cc 0 w Z w w 0 0 -JI ml Ca 0 w 0 J 0 m 0 0 0 0) 0 w• 2 0 CO 0 CO 2 Z w c 0 z CO m 0 O O O O CD 0 CD 0 CS) • CO 0^ (O LC) V M 1HOI3M AEI 2I3NId 1N332I3d 0 0 0 2 w N 9 w J 0 a Z(Z W W ZU LL w W O) H Z Z w QU W a M H WZ >w QU Oa O oS U2 02 co O 0 0 o� M O 0 o� CS) 0 CS) (a�)z CL CO N z 0_cc aw LL. m 02 0_Z d w • KtvIEWED FOR CODE COMPLIANCE APPROVED ILE Technical Information Report Revised August 13, 2020 4625 S 134th Place Tukwila, Washington Prepared for: Holaday-Parks, Inc. 4600 S 134th Place Tukwila, Washington 98168 August 13, 2020 PBS Project 41492.000 OCT 06 2020 City of Tukwila BUILDING DIVISION CORRE TION LTR# RECEIVED SE1-1 1 2020 TUKWILA PUBLIC WORKS CITY OF TUKWILA SEP 14 2020 PERMIT CENTER PBS 1180 NW MAPLE ST, SUITE 160 ISSAQUAH, WA 98027 425.654.8775 MAIN 866.727.0140 FAX PBSUSA.COM 91,1 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Table of Contents 1 PROJECT OVERVIEW 1 2 CONDITIONS AND REQUIREMENTS SUMMARY 12 2.1 Core Requirements 12 2.1.1 Discharge at the Natural Location 12 2.1.2 Off -Site Analysis 12 2.1.3 Flow Control Facilities 12 2.1.4 Conveyance System 12 2.1.5 Construction Stormwater Pollution Prevention 12 2.1.6 Maintenance and Operations 12 2.1.7 Financial Guarantees and Liability 12 2.1.8 Water Quality Facilities 12 2.1.9 Flow Control BMPs 13 3 OFF -SITE ANALYSIS 14 3.1 Upstream Basin Area 14 3.2 Downstream Areas — Immediate Proximity 14 3.3 Downstream Drainage Course 14 3.4 Site Discharge Locations 14 3.5 Resource Review 15 4 FLOW CONTROL, LOW IMPACT DEVELOPMENT (LID), AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 16 4.1 Existing Site Hydrology (Part A) 16 4.2 Developed Site Hydrology (Part B) 16 4.3 Performance Standards (Part C) 16 4.4 Flow Control System (Part D) 16 4.5 Water Quality System (Part E) 17 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 18 6 SPECIAL REPORTS AND STUDIES 19 7 OTHER PERMITS 20 8 CSWPP ANALYSIS AND DESIGN 21 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 22 10 OPERATIONS AND MAINTENANCE MANUAL 23 11 REFERENCES 24 Supporting Data FIGURES Figure 1. TIR Worksheet Figure 2. Site Location Figure 3A. Overall Basin Map Figure 3B. Existing Conditions Basin Map Figure 3C. Proposed Conditions Basin Map PBS August 13, 2020 PBS Project 41492.000 Technical Information Report 4625 S 134th Place I-loladay-Parks, Inc. Tukwila, Washington Figure 4. Soils (Not Available) APPENDICES Appendix A: Waters/Wetlands Delineation Report Appendix B: Revised Buffer Enhancement Plan ©2019 PBS Engineering and Environmental Inc. Ell PBS August 13, 2020 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 1 PROJECT OVERVIEW Holaday-Parks, Inc. seeks to redevelop 4625 S 134th Place (parcel number 2613200051) in Tukwila, Washington. The property was previously developed with a single-family residence. The residence was removed in summer 2017. The existing condition of the site includes 9,255 square feet of gravel paving, a wetland in the back of the parcel, and a pasture/wooded area at the front of the property. The existing condition for the stormwater runoff from the project site is that half of the runoff concentrates in a shallow ditch and flows directly into East Fork Southgate Creek; the other half flows directly into the creek in sheet flow through the pasture area. The proposed redevelopment includes constructing a 240-square-foot storage building and accessory parking consisting of five parking spaces occupying 3,280 square feet, along with a buffer enhancement plan. The surrounding setback will be landscaped per code requirements and gravel portion of wetland buffer will be restored as described in the Buffer Enhancement Plan. The proposed condition for stormwater runoff from the impervious surfaces is the runoff will be collected and dispersed into the watercourse buffer through a dispersion trench. PBS August 13,2020 1 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER project Owner BC & G LLC Phone Address Tukwila, Washington 98168 (206) 248-9700 4600 S 134th Place Project Engineer Dave Segal, PE Company PBS Engineering and Environmental phone (425) 654 8768 Part 3 TYPE OF PERMIT APPLICATION Landuse (e.g.,Subdivision / Short Subd. / UPD) ® Building (e.g.,MIF / Commercial / SFR) 0 Clearing and Grading 0 Right -of -Way Use Other Buffer Reduction Part 2 PROJECT LOCATION AND DESCRIPTION Project Name Holaday Parks Storage Facility DPER Permit # Location Township 23 Range 04 Section 15 Site Address 4625 S 134th Place Tukwila, Washington 98168 Part 4 OTHER REVIEWS AND PERMITS ❑ DFW HPA ❑ COE 404 ❑ DOE Dam Safety ❑ FEMA Floodplain ❑ COE Wetlands ❑ Other ❑ Shoreline Management ❑ Structural Rodke yNault/ ❑ ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Type of Drainage Review (check one): Date (include revision dates): Date of Final: Report ® Fun ❑ Targeted ❑ Simplified 0 Large Project El Directed Site Improvement Plan Type (check one): Date (include revision dates): Date of Final: Plan (Engr. Plans) ® Full ❑ modified El Simplified Part B SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Experimental / Blanket Description: (include conditions in TIR Section 2) Approved Adjustment No. Date of Approval: 2016 Surface Water Design Manual 1 Figure 1. TIR Worksheet (page 1 of 5) 4/242016 PBS August 13,2020 2 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required: Start Data: Describe: Yes / No Completion Date: Re: KCSWDM Adjustment No. Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan : Highline Special District Overlays: None Drainage Basin: Southgate Creek Stormwater Requirements: 2016 King County Surface Water Design Manual Part 9 ONSITE AND ADJACENT SENSITIVE AREAS River/Stream Southgate Creek ❑ Steep Slope ❑ Lake ❑ Erosion Hazard ® Wetlands Wetland A Landslide Hazard Class 2 - Moderate ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection Part 10 SOILS Soil Type Slopes Erosion Potential ❑ High Groundwater Table (within 5 feet) ❑ Sole Source Aquifer 0 Seeps/Springs ❑ Other urban land Additional Sheets Attached 2016 Surface Water Design Manual 2 Figure 1. TIR Worksheet (page 2 of 5) 4/24/2016 PBS August 13,2020 3 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE Core 2 — Offsite Analysis ® Sensitive/Critical Areas ❑ SEPA ❑ LID Infeasibility ❑ Other 0 LIMITATION / SITE CONSTRAINT Private property upstream Wetland impact mitigation ❑ Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: TDA 1 (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: 2 Oifsite Analysis Level: 0 / 2 / 3 dated: 5/9/2019 Flow Control (include fadity Level: 1 / 2 / 3 or Exemption Number <5, 000 imp. summary sheet) Flow ControlBMPS permeable pavement, dispersion trench Conveyance System Spill containment located at: NA Erosion and Sediment Control / CSWPP/CESCL/ESC Site Supervisor TBD Construction Storrnwater Contact Phone: Pollution Prevention After Hours Phone: Maintenance and Operation Responsibility (circle one): Wa / Public If Private, Maintenance Log Required: Yes `V Financial Guarantees and Provided: Yes /©o UabiGty Water Quality (include facility Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog summary sheet) or Exemption No. <5,000 imp. Landscape Management Plan: ( / No Special Requirements (as applicable): Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. one Requirements Name: Floodplain/Floodway Delineation Type (clrde one): Major / Minor / Exemption / 100-year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: NA 2016 Surface Water Design Manual 3 Figure 1. TIR Worksheet (page 3 of 5) 4/24/2016 PBS 4 August 13,2020 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Source Control (commercial / industrial land use) Describe land use: 240 sf storage building with 5 parking spaces Describe any structural controls: NA Oil Control High -use Site: Yes No Treatment BMP: Maintenance Agreement Yes / Q with whom? Other Drainage Structures Describe: Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Clearing Limits /:4 Stabilize exposed surfaces El Cover Measures ❑ Remove and restore Temporary ESC Fealties ❑ Perimeter Protection ® Clean and remove all silt and debris, ensure 0 Traffic Area Stabilization operation of Permanent Facilities, restore operation of Flow Control BMP Facilities as ❑ Sediment Retention necessary Surface Water Collection ❑ Flag limits of SAO and open space preservation ❑ Dewatering Control areas ❑ Dust Control 0 Other ❑ Flow Control 0 Protection of Flow Control BMP Facilities (existing and proposed) ❑ Maintain BMPs / Manage Project Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description Detention ❑ Infiltration El Regional Facility 0 Shared Facility 1 ❑ Flow Control BMPs ❑ Other ® Vegetated Flowpath ❑ Wetpool ❑ Filtration ❑ Off Control ❑ SPIII Control ❑ Flow Control BMPs ❑ Other dispersion trench permeable pavement permeable pavement 2016 Surface Water Design Manual 4 Figure 1. TIR Worksheet (page 4 of 5) 4/24/2016 EI PBS 5 August 13,2020 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS ❑ Drainage Easement ❑ Covenant ❑ Native Growth Protection Covenant ❑ Tract ❑ Other ❑ Cast in Place Vault ❑ Retaining Wall 0 Rockery > 4' High 0 Structural on Steep Slope ❑ Other Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided F e is dccu te. Signed/Date 5/10/2019 2016 Surface Water Design Manual 4/24/2016 5 Figure 1. TIR Worksheet (page 5 of 5) El PBS August 13,2020 6 PBS Project 41492.000 I► Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Project Site 1 , ;..... t' 4 li , .... . •-..r 4.,,, F c.I. I ci 1 .44 ' 4 , ',5.....' 17.‘• Tulcwila.0**-- - tTh St •Z13‘11047943° Figure 2. Site Location aleirry 1.1r113.1,- c fN El PBS August 13,2020 7 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington Figure 3A. Overall Basin Map (not to scale) SS PBS 8 August 13,2020 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington Figure 3B. Existing Conditions Basin Map (not to scale) PBS 9 August 13,2020 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington 0 O W H 0 cc a i6 Figure 3C. Proposed Conditions Basin Map (not to scale) PBS August 13,2020 10 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington The site is mapped as "Urban Land." Soil data is not available on USDA Web Soil Survey for the project site. Figure 4. Soils LN PBS August 13,2020 11 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 2 CONDITIONS AND REQUIREMENTS SUMMARY Based on Figure 1.1.2.A of the SWDM, the proposed site design is subject to full drainage review by the City of Tukwila. Please refer to Figure 5 for the overall basin map for the project site. 2.1 Core Requirements 2.1.1 Discharge at the Natural Location The natural (existing) discharge is half -concentrated and half-unconcentrated. Half of the runoff concentrates in a shallow ditch and flows directly into East Fork Southgate Creek; the other half flows directly into the creek in sheet flow through the pasture area. The project site is not located within a Landslide Hazard Drainage Area. The site is not adjacent to nor does it contain a landslide, steep slope, or erosion hazard area. Therefore, three discharge requirements do not apply. The proposed discharge location is a dispersion trench located in the watercourse buffer. The proposed discharge location matches the existing condition. 2.1.2 Off -Site Analysis One off -site upstream basin is identified. See Section 3 of this TIR. 2.1.3 Flow Control Facilities The City of Tukwila flow control drainage basin map requires basic flow control for the project site. Approximately 3,857 square feet of new plus replaced impervious surface will be created, and 5,123 square feet of new pervious surface will be added. The project meets the basic exemption for flow control core requirement; therefore, no flow control facilities are required. 2.1.4 Conveyance System New pipe systems and ditches will be designed with sufficient capacity to convey and contain the 25-year peak flow. 2.1.5 Construction Stormwater Pollution Prevention A temporary erosion and sediment control plan will be prepared to prevent sediment transport during construction. The plan will be in accordance with KCSWDM and City of Tukwila standards and will include the following measures: • Clearing limits • Silt fencing • Inlet protection • Mulching • Compost sock 2.1.6 Maintenance and Operations The site and storm drainage conveyance system will be maintained by the owner, Holaday-Parks. 2.1.7 Financial Guarantees and Liability The site is private property and does not include any right-of-way use. 2.1.8 Water Quality Facilities Of the 3,857 square feet of new plus replaced impervious surface, 2,830 square feet is pollution -generating impervious surface (PGIS). No new pollution -generating pervious surface will be added. The project meets the requirements of surface area exemption in KCSWDM Section 1.2.8. Water quality facilities are not required for this project. El PBS August 13,2020 12 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 2.1.9 Flow Control BMPs Flow control BMP requirements will be satisfied with the application of BMPs to the maximum extent feasible. All feasible BMPs will be implemented as part of project. Proposed flow control BMPs include permeable pavement and a dispersion trench. 0 PBS August 13,2020 13 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 3 OFF -SITE ANALYSIS The project lies within the Duwamish River Basin. The threshold discharge area (TDA) does not have any upstream off -site basin that contributes to the TDA. The stormwater runoff is produced from the storage building roof and from the parking lot when rainfall intensity exceeds the saturation rate of the permeable pavement. In the existing conveyance system, runoff from the gravel lot discharges directly into East Fork Southgate Creek either in the ditch as shallow concentrated flow or through the pasture area at the front of the parcel as sheet flow. The proposed conveyance system will collect runoff from the permeable pavement and storage building into a new manhole and then discharge to a dispersion trench. From there, the flow will disperse into the watercourse buffer. Any excess runoff that is not fully infiltrated in the buffer will flow into East Fork Southgate Creek. Any excess runoff from the surrounding landscape or wetland area will flow into East Fork Southgate Creek, matching the existing condition. 3.1 Upstream Basin Area No off -site basins have been identified. The proposed drainage system will only collect surface water within the curb perimeter, including the parking lot and the storage building roof. The drainage condition for the surrounding landscape and wetland is unchanged. There is an additional basin whose runoff contributes to the wetland on the site under the existing condition. Due to lack of information for the basin and the fact that runoff from wetland will not enter the proposed project drainage system, its existence is recognized but deemed irrelevent for the purpose of this anaylsis. 3.2 Downstream Areas — Immediate Proximity The propsed discharge location is the dispersion trench located in the watercourse buffer. Any excess runoff that is not fully infiltrated flows into the adjacent East Fork Southgate Creek. The creek runs parallel to the parcel along S 134th Place for about 1,800 feet before tuming north behind Macadam Road S. 3.3 Downstream Drainage Course The downstream drainage course for the outfall dispersion trench is East Fork Southgate Creek. As the excess runoff discharge into the creek is minimal compared to creek flows, there is no need for further analysis. 3.4 Site Discharge Locations The proposed conveyance system collects runoff from the permeable parking lot and storage building roof to a new manhole and disperses the flow into the watercourse buffer through a dispersion trench. PBS August 13,2020 14 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington 3.5 Resource Review The drainage complaint map below, taken from the King County iMap, shows drainage complaint areas downstream of the dispersion trench outfall. There are no known severe drainage problems along the 1/4 mile downstream flow path. The only drainage complaint is upstream of the subject property. 34 4439 ° 0 4443 p\ 4550 .. 1339 , j .4449 4445 . 4.4453 #13325 -4435 - ,'s4 * > " e4600 413' �44r 59,r 3411 E t 04471 ,gf j 647489 r 4611 �134 5 K ',"�� 44�9/5 4 501 ^\. b a �a..4477 :- •°_ •45s5 4497 0 PBS August 13,2020 15 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington 4 FLOW CONTROL, LOW IMPACT DEVELOPMENT (LID), AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.1 Existing Site Hydrology (Part A) Table 1 summarizes the land cover characteristics of the existing conditions. Figure 3B, Existing Conditions Basin Map, shows more detailed information for the basin. Threshold discharge area 1 (TDA 1) is mostly consists of gravel surface. Table 1. Existing Conditions Basin Areas Basin Name Impervious Area (Acres) Pervious (Acres) Total Area (Acres) TDA 1 0.206 0.017 0.223 4.2 Developed Site Hydrology (Part B) Table 2 summarizes the land cover characteristics after development. Figure 3C, Proposed Conditions Basin Map, shows more detailed information for the basin. A portion of the gravel surface is landscaped; therefore, the PGIS surfaces will be less after redevelopment. Table 2. Developed Conditions Basin Areas Basin Name Impervious Area (Acres) Pervious Area (Acres) Total Area (Acres) TDA 1 0.089 0.134 0.223 4.3 Performance Standards (Part C) Approximately 3,857 square feet of new plus replaced impervious surface will be created, and 5,123 square feet of new pervious surface will be added. The project meets the basic exemption for flow control core requirement; therefore, no flow control facilities are required. 4.4 Flow Control System (Part D) Due to the new plus replaced impervious surface being over 2,000 square feet, the project is subject to core requirement #9, flow control BMP. Target surfaces for this requirement include new impervious surfaces, new pervious surfaces, replaced impervious surfaces, and any existing impervious surfaces added on or after January 8, 2001. Since this project is a private parcel redevelopment that is on an individual lot and the lot size is smaller than 22,000 square feet, Small Lot BMP Requirements apply, per Section 1.2.9.2.1 of the SWDM. Soil moisture holding capacity of new pervious surfaces will be protected in accordance with King County Code (KCC) 16.82.100(F) and (G). The private lot does not have any forest area; therefore, full dispersion is not applicable. Among the BMPs recommended by small lot BMP requirements, permeable pavement is selected as it will cover the majority of the impervious area and due to the restrictions in the Onsite LID Conditions. All paving to be done on site, including the parking and driveway, will utilize permeable pavement to further reduce the runoff generated by the proposed building and structures. Surface water will outfall at a dispersion trench to match and improve the existing discharge situation. PBS August 13,2020 16 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 4.5 Water Quality System (Part E) Out of the 3,857 square feet of new plus replaced impervious surface, 3,280 square feet is PGIS. No new pollution -generating pervious surface will be added. The project meets the requirements of surface area exemption in KCSWDM Section 1.2.8. Water quality facilities are not required for this project. EIPBS August 13,2020 17 PBS Project 41492.000 Technical Information Report Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN The King County Stormwater Manual requires the conveyance system to collect and convey the 25-year peak flow. The 100-year peak flow may overburden the conveyance system but must not cause flooding impacts downstream. The conveyance system for the proposed development consists of one catch basin that collects and conveys the runoff through an 8-inch HDPE pipe into a level spreader where it discharges into the riparian area downhill. The overall impervious area of the parking area and building is 0.089 acre. Due to site constraints, the catch basin is able to capture 0.078 acre of runoff while the remaining 0.011 acre flows to East Fork Southgate Creek. Western Washington Hydrology Model (WWHM) was used to calculate the runoff generated based on land cover, slope, and geographic location. Table 3 shows the peak flow rates collected by the catch basin. Table 3: Collected Peak Runoff Flow Basin Name Q2 (cfs) Q10 (cfs) Q25 (cfs) Q100 (cfs) Holaday-Parks Development 0.03 0.05 0.06 0.07 The proposed 8-inch high -density polyethylene (HDPE) pipe has the capacity to convey 0.90 cubic feet per second (cfs) when flowing full. This capacity was determined using the pipe design slope of 1.89 percent and roughness coefficient of 0.025. Thus, the proposed conveyance system meets the requirements of the King County Stormwater Manual. PBS August 13,2020 18 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 6 SPECIAL REPORTS AND STUDIES The Waters/Wetlands Delination Report is provided in Appendix A and the Buffer Enhancement Plan is provided in Appendix B. PBS August 13,2020 19 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 7 OTHER PERMITS Holaday Parks is applying for a City of Tukwila Construction Permit. El PBS August 13,2020 20 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 8 CSWPP ANALYSIS AND DESIGN A construction SWPPP will be provided. EI PBS August 13,2020 21 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantities, Facility Summaries, and Declaration of Covenant are not applicable for this project. El PBS August 13,2020 22 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 10 OPERATIONS AND MAINTENANCE MANUAL Operations and maintenance information is provided in the Buffer Enhancement Plan. PBS August 13,2020 23 PBS Project 41492.000 Technical Information Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 11 REFERENCES Please refer to the Waters/Wetlands Delineation Report and Revised Buffer Enhancement Plan in Appendix A and B for lists of references. SS PBS August 13,2020 24 PBS Project 41492.000 • Appendix A Waters/Wetlands Delineation Report Waters/Wetlands Delineation Report Parcel #2613200051 4625 S 134th Place Tukwila, Washington Applicant: Holaday-Parks, Inc. Bart Collins 4600 S 134th Place Tukwilla, Washington 98168 June 2018 (Rev. April 2019) PBS Project 41492.000 PBS 214 EAST GALER STREET SEATTLE, WA 98102 206.233.9639 MAIN 866.727.0140 FAX PBSUSA.COM Waters/Wetlands Delineation Report 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington TABLE OF CONTENTS 1 INTRODUCTION 1 2 PROPERTY DESCRIPTION 1 2.1 Location 1 2.2 Site Description 1 2.3 Site History 2 2.4 Climate 2 2.5 Plant Communities 3 3 WATERS/WETLANDS DELINEATION METHODS 3 3.1 Rationale for Use of the Routine Delineation Methods 3 3.2 Office Methods 4 3.3 Field Methods 4 3.3.1 Vegetation 4 3.3.2 Hydrology 4 3.3.3 Soils 4 3.3.4 Mapping 4 4 WATERS/WETLANDS DELINEATION RESULTS 4 4.1 National and Local Wetland Inventories 4 4.2 Growing Season 4 4.3 Characterization of Delineated Waters/Wetlands 5 4.3.1 Jurisdictional Waters 5 4.3.2 Jurisdictional Wetland 5 4.4 Wetland and Stream Ratings, Jurisdictional Status, and Buffers 6 4.4.1 Stream Rating and Buffers 6 4.4.2 Wetland Rating and Buffers 6 5 CONCLUSIONS 7 6 REFERENCES 8 153 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks S 134`h Place Tukwila, WA SUPPORTING DATA TABLES Table 1. Monthly Precipitation Totals and Normals PHOTOGRAPHS FIGURES Figure 1. Figure 2. Figure 3. Site Vicinity Map City of Tukwila Mapped Wetlands and Streams Waters/Wetlands Delineation Map APPENDICIES Appendix A — Wetland Delineation Data Sheets Appendix B — Wetland Rating Forms ©2019 PBS Engineering and Environmental Inc. PBS April 2019 ii PBS Project 41492.000 Waters/Wetland Delineation Report 4625 S 134th Place Holaday Parks Tukwila, WA 1 INTRODUCTION PBS Engineering and Environmental Inc. (PBS) was contacted by Bart Collins of Holaday-Parks, Inc. (Holaday- Parks) regarding a property in Tukwila that the company owns across the street from their main company offices. A single-family residence was removed from the property in late summer 2017 and portions of the lot were graded to facilitate use as a parking lot. The City of Tukwila (City) issued a notice of violation in November 2017, citing unauthorized use of the lot for employee parking and unpermitted disturbance of a critical area buffer. A small stream flows along the NE edge of the property in the right-of-way for S 134th Place. PBS Professional Wetland Scientist Katharine Lee conducted a site visit on December 22, 2017, to assess the condition of the stream and buffer, and conducted a wetland reconnaissance on February 12, 2018, and a follow- up wetland delineation on April 5, 2018. PBS Project Biologist Teegan McClung prepared this delineation report to summarize our findings of fact and judgment concerning the geographic extent, and federal, state, and City of Tukwila jurisdictional status of waters/wetlands on or immediately adjacent to the subject property. This wetland delineation has been performed in compliance with accepted standards for professional wetland biologists and applicable federal, state and City of Tukwila procedures and regulations. The waters/wetlands boundaries and classifications described in this report are PBS' best professional opinion based on the circumstances and site conditions encountered at the time of this study. They are subject to confirmation by agencies with jurisdictional authority over proposed activities. 2 PROPERTY DESCRIPTION 2.1 Location The property consists of one tax parcel (2613200051) located at 4625 S 134th Place just west of the junction of Interstate 5 and State Route 599 within the city limits of Tukwila, Washington. It is in the NE'/a of Section 15, Township 23N, Range 4E. The coordinates of the center of the property are Latitude 47.482559, Longitude -122.274869. 2.2 Site Description The property is rectangular, totaling 0.42 acre in size and measuring 67 to 77 feet wide by 250 feet long. Elevations range from 25 feet above sea level at the northeast edge to 45 feet at the southwest edge. The property is zoned commercial/light industrial. Neighboring properties to the southeast and southwest are residential, while properties to the north and west are commercial and light industrial. There are currently no structures on the site. Soil surveys were not available for this site as it is within the unmapped portion of the City of Seattle (NRCS Web Soil Survey). The property is in the Duwamish-Green River Watershed (WRIA 9) and a small tributary to the Duwamish River named Southgate Creek flows north off -property but along the property boundary, on the south side of S 134th Place. In this reach, Southgate Creek is confined to a drainage ditch on the southside of S 134th Place. The property has an existing gravel driveway to access S 134th Place over a 42-inch-wide oval corrugated metal pipe (CMP) culvert for conveyance of the stream. A 35-foot-wide vegetated buffer remains along Southgate Creek between the driveway on the west and the property line on the east. Gravel extends across most of property width from the vegetated stream buffer to a stand of black cottonwood trees (Populus balsamifera var. trichocarpa) on the southwestern end of the property. There is a retaining wall along the southwestern property boundary with a small stormwater outfall from the adjacent property extending out from the wall and a patch of reed canary grass (Phallaris arundinacea) and Himalayan blackberry (Rubus armeniacus) between the wall and the cottonwood trees. Stormwater has also been observed flowing onto the property from a residential development just south of the most southwestern property corner. Water appears to flow intermittently out of the black cottonwood stand into a small (<1 foot wide) existing ditch in front of Q PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA the cottonwood trees that continues along the western property boundary from southwest to northeast and terminates in Southgate Creek. 2.3 Site History A historical review of the property was conducted using available aerial imagery in King County and City of Tukwila iMap applications. In 1936 the property consisted of two structures, a building we know to be a single-family residence and a garage southwest of the residence. The remaining land area was crop or lawn type vegetation with a few low shrubs or trees. There were roads present along the northeastern and northwestern edges of the property in 1936 as well. Surrounding areas appeared to be agricultural. By 1998 trees have grown up around the property on the northeastern edge and behind the small garage. A driveway providing access to S 134th Place is also visible leaving the property. In 2001, the garage was demolished, and the middle third of the property is covered with a gravel/rocky substrate. Trees were still present along the northeastern and southwestern property boundaries up to present. Additional gravel was placed around the single-family residence between 2005 and 2007 and between 2013 and 2015. The property was purchased by Holaday-Parks in March 2016. In August 2017, Holaday-Parks obtained a permit from the City to demolish the single-family residence on the property. After demolishing the house, the area was graded and covered with gravel. A portion of what had been lawn with a few ornamental shrubs on the north side of the house towards the stream was also converted to gravel. The vegetated area that was converted to gravel measures approximately 1,000 square feet. The critical areas violation issued by the City pertains to both the portion of the house that was in the buffer (approximately 1,000 square feet) and the lawn area (an additional 1,000 square feet). Under City of Tukwila Code (18.70.40), the house and yard would have been nonconforming uses, which would have been allowed to continue, but once the house was demolished, the footprint of the house reverted to buffer. No impacts occurred to the stream or the first 35 feet of the buffer. 2.4 Climate The property is in the Puget Sound lowlands climatic region has a predominantly temperate marine climate. Summers are warm and relatively dry, and winters tend to be mild, but rather wet. Mean high temperatures for the Seattle -Tacoma Airport (4.3 miles south) range from 46°F in December and January to 76°F in July and August. Mean low temperatures range from 36°F in December and January to 56°F in July and August (US Climate Normals 1912-2016. Rainfall averages almost 39 inches per year (SeaTac Station FIPS 53033), most of which typically falls as rain between November and April. Precipitation levels are considered normal when they fall between figures for which there is a 30% chance of more than that amount and a 30% chance of less than that amount. Precipitation was normal prior to the December stream assessment, above normal prior to the February wetland reconnaissance, and lower than normal for the months of February and March immediately prior to the wetland delineation visit in April. Precipitation was slightly above the normal range for the 12 months preceding the delineation (Table 1). 2 M PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA Table 1. Monthly precipitation totals and "normal" ranges and averages for SeaTac, WA. Precipitation (inches) in SeaTac, Washington Month Year Actual 2017/2018 Normal Range 30% chance will have 1971-2017 Average Above or Below "Normal" Range Less than More than October 2017 2.02 2.19 4.39 3.62 Below November 2017 6.39 4.40 7.32 4.40 - December 2017 4.67 3.96 6.65 5.61 - January 2018 7.32 3.88 6.28 5.33 Above February 2018 2.45 2.54 4.70 3.91 Below March 2018 1.96 2.98 4.79 4.07 Below April 2018 5.15 1.81 3.30 2.75 Above Annual 2017/2018* 41.68 34.52 41.38 38.22 Above *Annual Precipitation Total from May 2017-April 2018 Data from https://www.wunderground.com/history/airport/KBFI/2018/4/12/MonthlyHistory.html and http://agacis.rcc-acis.org/?fips=53033 2.5 Plant Communities There are three main plant communities on this site and they include the stream buffer along S 134th Place, ornamental plantings around the former residence, and a stand of cottonwood trees on the southwestern third of the property. The vegetated stream buffer area is approximately 35 feet wide and occupies -2,200 square feet. Nearly all the existing vegetation in the buffer is non-native and/or invasive. There are two horse chestnut (Aesculus hippocastanum) trees near the top of the stream bank on the property, the larger of which is approximately 30 inches in diameter. About a dozen small (6- to 12-foot-tall) horse chestnut trees have sprouted along the bank as well. There is a large patch of cherry laurel (Prunus laurocerasus) and Himalayan blackberry along the streambank on the property. Several ornamental rhododendrons (Rhododendron sp.) are present as well as several holly trees (Ilex aquifolium). English ivy (Hedera helix) covers much of the area and extends up into the chestnut tree canopy. Other species include evergreen blackberry (Rubus lacinatus), creeping buttercup (Ranunculus repens), bittersweet nightshade (Solanum dulcamara), herb Robert (Geranium robertianum), bentgrasses (Agrostis stolonifera), and other lawn grasses. Ornamental plantings include several ornamental cherry trees along the southeast property line and a row of Austrian pine (Pinus nigra) trees that are approximately 12 inches in diameter along the northwest property line. Little understory vegetation is present below the pines. On the southwestern third of the property there is a stand of black cottonwood trees (DBHs <25 inches) adjacent to the gravel and behind the trees there is a patch of Himalayan blackberry, Reed canary grass, and thistle (Cirsium arvense). During the sites visits, other species in this plant community include creeping buttercup, English ivy, and orchard grass (Dactylis glomerata). 3 WATERS/WETLANDS DELINEATION METHODS 3.1 Rationale for Use of the Routine Delineation Methods The project site occurs in the region defined in the Western Mountains, Valleys and Coast Regional Supplement (WMVC Supplement). Based upon guidance provided in the Corps of Engineers 1987 Wetland Delineation Manual (1987 Manual) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: WMVC (Version 2.0), it is the best professional judgment of the PBS wetland scientist that the current wetlands in the study area exist under "normal circumstances" as defined in the 1987 Manual and 3 11 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA supplement. Therefore, the waters and wetlands were delineated on the project using methods recommended in the manual for routine situations. 3.2 Office Methods Office preparation for the delineation consisted of reviewing on-line sources and information provided by the client. The review included but was not limited to NWI mapping, soil mapping, topography, regional plant communities, priority habitats, water quality assessments and local regulations. 3.3 Field Methods 3.3.1 Vegetation The existing vegetation was characterized for wetlands and adjacent uplands. Species identifications and taxonomic nomenclature followed the USDA Plants Database. Each species' indicator status was assigned using the WVMC 2016 Regional Wetland Plant List (Lichvar et al. 2016). A species indicator status refers to the relative frequency with which the species occurs in jurisdictional wetlands. An area satisfies the hydrophytic vegetation criteria when, under normal circumstances, more than 50 percent of the dominant species from each stratum are obligate wetland (OBL), facultative wetland (FACW), or facultative (FAC) species. 3.3.2 Hydrology The presence of wetland hydrology was determined by evaluating a variety of direct and indirect indicators. In addition to hydrologic data and records pertaining directly to the study area, hydrologic indicators can be used to infer satisfaction of the wetland hydrology criterion. Field indicators of wetland hydrology listed in the Regional Supplement include, but are not limited to, visual observation of inundation or saturation, sediment deposition, hydric soil characteristics, watermarks, drift lines, oxidation around living roots and rhizomes, salt or biotic crusts, and water -stained leaves. To satisfy the hydrology criterion for wetlands, soils need to be inundated or saturated to the surface for at least 5% of the growing season. The delineation was conducted early growing season. 3.3.3 Soils The presence of hydric soils was determined consistent with the WVMC Regional Supplement and current regulatory guidance. The supplement includes a number of hydric soil indicators specific to this region. Soils were evaluated based on these indicators. 3.3.4 Mapping An Ashtech MobileMapper 10 handheld GPS unit was used to capture the stream OHW, wetland boundary, and data plots. Post processing of the data was conducted in the office to correct GPS locations based on known satellite position. While we are confident that the features are mapped with reasonable accuracy, individual point location may be off by up to 20 feet. 4 WATERS/WETLANDS DELINEATION RESULTS 4.1 National and Local Wetland Inventories The National Wetlands Inventory (NWI) shows no wetlands on the property. The nearest mapped NWI wetland is approximately 1 mile southeast of the property. City of Tukwila critical areas mapping shows a Category III wetland 700 feet southeast of the property associated with the upper reaches of Southgate Creek (Figure 2). 4.2 Growing Season The Natural Resources Conservation Service (NRCS) currently defines the growing season as that portion of the year when soil temperatures at 20 inches below the soil surface are higher than biological zero (41°F or 5°C). When soil temperature data are not available, the Wetland Delineation Manual allows using the closest and best available weather station data to estimate the length of the growing season based on a 50 percent probability of a temperature of 28°F or higher (Ecology 1997, paragraph 46). 4 11 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA Based on the 28°F standard and climatic data for SeaTac, Washington (NRCS 2016), the growing season is approximately 306 days at least 50 percent of the time, extending from February 7 to December 10. To meet the hydrology criteria at this site, soils would need to be saturated to the surface for at least 5 percent of the growing season or 15.3 days. 4.3 Characterization of Delineated Waters/Wetlands 4.3.1 Jurisdictional Waters 4.3.7.7 Southgate Creek (Stream 1) Development in the area has dramatically changed the creek from its historical condition. The stretch of Southgate Creek at the edge of the property has been confined in a roadside ditch since at least the 1930's based on a review of historical aerial photographs. The stream passes through a number of culverts along this stretch that provide access to adjacent properties. A 38-foot-long, 42-inch-wide oval CMP culvert passes under the driveway access to the property. The driveway is approximately 20 feet wide over the culvert. The OHW of the stream is 3 to 6 feet north of the property boundary so the entire stream is outside the property limits. The downstream end of this culvert is at the north property corner. The stream in front of the property upgradient from the culvert has an ordinary high water mark (OHWM) width of 5 to 6 feet. Below the driveway culvert on the neighboring property, the stream widens slightly with an OHWM width of 8 to 9 feet and a retaining wall along the street. The section of stream in front of the subject property is confined between steep slopes. Slopes from the edge of the road to the stream OHWM are very steep and near vertical in places with evidence of erosion. Slopes on the subject property are also steep and up to 80 percent, rising approximately 4 to 6 feet to a break in slope. The stream gradient in front of the property is approximately 4 percent and at the time of the site visit, water was flowing quite rapidly. Further downgradient, the stream gradient becomes flatter. Armoring is present along the sides of the creek and rock and concrete pieces are also present in the stream. The streambed is mostly silt, sand and gravels and some small cobbles. Vegetation below OHWM is sparse. 4.3.2 Jurisdictional Wetland 4.3.2.7 Wetland A One wetland (Wetland A) was identified and delineated at the southwestern edge of the property extending from the base of the retaining wall to the southwest, a parking lot to the north, a residential development to the south and the gravel parking area on site to the east. The wetland was delineated by collecting a wetland and upland data plot. The vegetation in the wetland plot (Plot 1) included black cottonwood (FAC), Himalayan blackberry (FAC), Reed canary grass (FACW), and thistle (FAC). The vegetation is considered hydrophytic (representing wetland conditions) based on the Dominance Test because 100% of the plants were either OBL, FACW, or FAC and the Prevalence Index with a value of 2.63, where any value less than 3 indicates hydrophytic vegetation. The soil in the wetland plot (Plot 1) was saturated to the surface during the February and April field visits and the ground water table present 10 inches below the surface during the April field visit. This area meets the criteria for wetland hydrology because it had saturation to the surface during multiple points during the growing season and a water table present within the top 12 inches of the soil surface. Soils had a dark grayish brown silt loam surface horizon (10YR 4/2) to 8 inches, followed by a dark grey silt loam (10YR 4/1) with 5% redox concentrations (10YR 4/6) to 12 inches and then a grayish brown silty clay loam (2.5Y 5/2) with 25% redox concentrations (10YR 4/6 and 10YR 4/4) to 18 inches. The soil in the wetland has a depleted (grayish) matrix (F3) with 5% or more of redox concentrations starting within 10 inches of the surface and is therefore considered a hydric soil. Based on these field observations, this area meets the vegetation, hydrology, and soils wetland criteria established in the federal wetland delineation manual and is therefore considered a wetland. 5 ES PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA The vegetation in the adjacent upland plot (Plot 2) consisted of Austrian pine (Pinus nigra, NL), Pacific willow (Salix lasiandra, FACW), Himalayan blackberry (FAC), and English Ivy (FACU). The vegetation was not considered hydrophytic (representing wetland conditions) because it did not pass the Dominance Test and the Prevalence Index value was 3.08. The soil in the upland plot (Plot 2) was not saturated at 18 inches of the surface during the April field visit and therefore does not meet the criteria for wetland hydrology. Soils were uniform with a very dark gray silt loam matrix (7.5YR 3/1) to 18 inches and did not meet the criteria to be considered a hydric soil. The complete wetland delineation data sheets are available in Appendix A of this report. 4.4 Wetland and Stream Ratings, Jurisdictional Status, and Buffers 4.4.1 Stream Rating and Buffers The City of Tukwila identifies the stream that flows along the southwest side of S 134th PI in front of the property as the east fork of Southgate Creek. The City's Critical Areas Maps show the stream as a Type 2 watercourse. Type 2 watercourses are defined as "those watercourses that are known to be used by fish or meet the physical criteria to be potentially used by fish and that have perennial (year-round) or seasonal flows." According to the City of Tukwila's 2013 Surface Water Comprehensive Plan Coho salmon are potentially present in Southgate Creek, along with resident trout and other types of non-anadromous fish. Some rearing habitat is assumed to be present along S. 134th PI. Buffers are set for Type 2 streams at 100 feet. Buildings must be set back an additional 15 feet and other development must be set back 10 feet from the edge of the buffer. The City allows for a reduction in buffer width if the existing buffer had been significantly degraded and the remaining buffer is enhanced through an approved buffer enhancement plan. 4.4.2 Wetland Ratung and Buffers We classified Wetland A as a forested palustrine wetland with seasonal saturation (Cowardin et al. 1979). Using the Washington State Rating System for Western Washington from 2004 (TMC 18.45.080(B)), we have rated this as a Category IV slope wetland with a total score of 23, a water quality score of 10, a hydrology score of 4, and a habitat score of 9 (Appendix B). It is our professional opinion that the US Army Corps of Engineers (USACE), the Washington State Department of Ecology, and the City of Tukwila (TCM 18.45.80) will likely consider this a jurisdictional wetland due to its proximity to the stream on the eastern edge of the property and that any impacts would be subject to regulation by the above listed agencies. This finding is subject to confirmation by the listed agencies with jurisdictional authority over proposed activities. A Category IV wetland in the City of Tukwila has associated 50-foot buffers (TMC 18.45.080(D)3)) with an additional 15 feet of building setbacks for commercial and industrial buildings and 10 feet for other types of development from the edge of the buffer. Wetland and stream buffers in the City of Tukwila may be reduced to no less than 50 percent of the standard buffer width, if the conditions specified in TMC 18.45.080{F) and 18.45.100(E) are met. These conditions include the preparation of a buffer enhancement plan by a qualified wetland biologist. A buffer enhancement plan has been prepared for the project addressing the criteria defined in the Tukwila municipal code, and is provided as a separate document. 6 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA 5 CONCLUSIONS The 0.42-acre property is located in Duwamish River watershed and Southgate Creek runs in a drainage ditch off site, along the northeastern edge of the property. The stream is a Type F water. There is one wetland present on the southwestern third of the parcel, with some stormwater contributions from a stormwater outfall emerging from an adjacent retaining wall. The total wetland area on the property is approximately 4,383 square feet (0.10 acre). The wetland size has been confirmed during site survey (Pacific Coast Surveys, Inc.), and the revised critical area buffers for these features are shown on Figure 3. With the standard buffer widths and building setbacks, there is no developable area on the property, restricting the reasonable use. Respectfully submitted (January 2019), Katharine Lee Professional Wetland Scientist #001965 Teegan McClung Project Biologist This report was revised in April 2019 to reflect the survey of the site and wetland flags by Pacific Coast Surveys, Inc. PBS staff field recorded the OHWM of Southgate Creek within the S 134th Place right-of-way with a Trimble Geo 7 handheld GPS capable of sub -meter accuracy. These data were matched to the surveyed culvert location and contours in Figure 3 to serve as the basis for the stream buffer. Staff also located 1 wetland flag that was missing from the survey. The flag location was determined using field measurements from a tape measure and compass (+/- 1 inch), supplemented by GPS data collected with the Trimble Geo 7. This flag location was added to Figure 3 and compared with the previously collected GPS data. The resulting boundary for Wetland A is 383 square feet larger than the boundary collected with the Ashtech GPS, which likely reflects the greater positional accuracy of the survey. The report revisions include the updated wetland size and a summary of the City's buffer reduction criteria for wetland and streams. Revisions to this report were prepared in April 2019 by: Digitally signed by Patrick J. Togher, PWS Date: 2019.05.09 13:36:07 -07'00' Patrick J. Togher Professional Wetland Scientist #1659 7 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report 4625 S 134th Place Holaday Parks Tukwila, WA 6 REFERENCES Burke Museum, University of Washington Herbarium. 2013. Image Collection, Plants of Washington State. http://biology.burke.washington.ed u/herbarium/imagecollection.php CH2MHill. 2013. City of Tukwila 2013 Surface Water Comprehensive Plan. City of Tukwila Municipal Code. 2018. Chapter 18.45. Environmentally Sensitive Areas. Accessed online at: http://records.tukwilawa.gov/WebLink/1 /edoc/56618/Tukwila%20Municipal%20Code%20- %20Title%2018%20-%20Zoning.pdf City of Tukwila. 2011. Special Permission — Director Information Sheet. City of Tukwila Critical Areas Map. 2018. Cowardin, L. M., C. Carter, F. C. Golet, and E. T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. FWS/OBS-78/31. US Department of the Interior, Fish and Wildlife Service, Office of Biological Services, Washington, D.C. Environmental Laboratory. 1987. Corps of Engineers Wetland Delineation Manual. Technical Report Y-87-1. US Department of the Army, Corps of Engineers, Waterways Experiment Station, Vicksburg, Mississippi. http://www.saj.usace.army.mil/permit/documents/87manual.pdf Environmental Laboratory. 2010 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0). U.S. Army Corps of Engineers, Research and Development Center. May 2010. Google Earth. 2013. Aerial imagery. Hruby, Thomas. 2004. Washington State Wetland Rating System for Western Washington Revised. Washington State Department of Ecology Publication #04-06-025. https://fortress.wa.gov/ecy/publications/documents/0406025.pdf. Accessed on-line: Sept 2017. King County IMAP. 2018. Accessed online at: http://www.kingcounty.gov/operations/GIS/Maps/iMAP.aspx Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2016. The National Wetland Plant List: 2016 wetland ratings. Phytoneuron 2016-30: 1-17. Published 28 April 2016. ISSN 2153 733X Munsell Color. 2000. Munsell soil color charts. Gretag Macbeth, New Windsor, New York. Natural Resource Conservation Service (NRCS) 2018 Online interactive soil survey http://websoilsurvey.nrcs.usda.gov/app/VVebSoilSurvey.aspx Natural Resource Conservation Service. 2018. Climate data for SeaTac, Washington. National Water and Climate Center. http://agacis.rcc-acis.org/?fips=53033 Pojar, 1.. and A. MacKinnon. 1994. Plants of the Pacific Northwest coast, Revised. BC Ministry of Forests and Lone Pine Publishing. Vancouver, British Columbia. Washington State Department of Ecology (WA DOE). 2004. Washington State Wetland Rating System for Western Washington. Washington State Dept. of Fish & Wildlife (WDFW) 2018. Priority Habitat and Species Mapping. http://apps.wdfw.wa.gov/phsontheweb/ Washington Weather Underground. 2018. Rainfall data for SeaTac, WA https://www.wunderg rou nd.com/history/airport/KBFI/2018/4/12/MonthlyH istory.html WA Department of Fish and Wildlife (WDFW). 2018. Salmonscape. Accessed online at: http://apps.wdfw.wa.gov/salmonscape/ 8 E1 PBS April 2019 PBS Project 41492.000 Waters/Wetland Delineation Report Holaday Parks 4625 S 134th Place Tukwila, WA WTU Herbarium Image Collection. 2017. Burke Museum of Natural History and Culture. Accessed online at: http://biology.burke.washington.edu/herbarium/imagecollection.php US Fish and Wildlife Service. (USFWS) 2018. National Wetland Inventory. Wetlands Mapper. http://www.fws.gov/wetlands/Data/Mapper.html United State Department of Agriculture (USDA) Plants Database. 2018. http://plants.usda.gov/java/ 9 Q PBS April 2019 PBS Project 41492.000 PHOTOGRAPHS Photo 1. Google Earth aerial of property taken in June 2016 prior to removal of house. Photo 2. Google Earth street view looking northwest from S 134t" Place showing Southgate Creek in a ditch along the side of the road with a steep bank up to the subject property. Photo 3. View to east of stream in roadsiae ditch along S. 134th Place Photo 5. View to east of buffer at southeast property corner with larger horse chestnut tree covered with ivy and small horse chestnuts sproutin• around it. Photo 7. View northeast of Wetland A and the stand of black cottonwoods Photo 4. View to west of stream below property with end of driveway culvert in foreground. Additional driveway culverts in background. Photo 6. View north-northeast of the existing ditch along the north edge of the black cottonwoods and Austrian pine trees. Photo 8. View north across the reed canary grass and Himalayan blackberry in Wetland A at the base of the retaining wall FIGURES Figure 1. Site Vicinity Map Figure 2. City of Tukwila Sensitive Areas Map Figure 3. Waters/Wetlands Delineation Map 1thSt S 1441th St I .1. If i St S 150 th St < S 160th St 4,7. ,0 -M.2004700 Tukwila /Ve stfi . frf 12. th St Boeing o Lo ngac re CIPan IN PBS PROJECT # 41492 DATE JUN 2018 PROJECT VICINITY MAP Holaday Parks Property Tukwila, WA FIGURE 1 Legend Tukwila City Limits • Potential Watercourse Daylighting Sites -- Type 2 Stream - Type 2 Stream in Pipe — Type 3 Stream — Type 3 Stream in Pipe -- Type 4 Stream — Type 4 Stream in Pipe Type 2 Watercourse Buffer (100') Type 3 Watercourse Buffer (80') Type 4 Watercourse Buffer (50') Potential Wetlands Ell Category I & II Wetland Category III Wetland Category IV Wetland El Category I & II Wetland Buffer (100') Category III Wetland Buffer (80') Category IV Wetland Buffer (50') IN PBS PROJECT # 41492 DATE JUN 2018 CITY OF TUKWILA SENSITIVE AREAS Holaday-Parks Property Tukwila, WA FIGURE 2 50' Standard Buffer 25' Reduced Buffer I Plot D-P2 r• ♦r \ 261100049 / ./ I \ I / / 2613200650 / / WASHINGTON CB IM=23.0\ IE 8' DI(E)=20.09 / IE 48' CMP=6\ IE 48' CMPd9N WLF 9 . / END FENCE 0.2 (E) ♦♦ OF PROP. UNE `• ♦� TOP=51g I • ' %♦♦ I END FENCE 4.3'(E), 1. ''(S) ♦♦ OF PROP. CORN `♦♦` I `♦ 2613200023 2613200022 24 CB RIM=23.00 IE 8' DI(SW)=21.10 IE 4" PVC(NE)=21.30 END FENCE 04E) OF PROP. !!NE 2613200025 CB RIM=23.19 IE 24' CMP(N =18.69 IE 24' CMP(S)=18.69 IE =19.89 IE 8" DI((W)=19.29 Southgate Creek 50' Reduced Stream Buffer 2613200028 100' Standard Stream Buffer N. SITE BENCH? NAIL/WASHEI 37536" PRE SET. ELEV.=. SOURCE: Pacific Coast Surveys, Inc. 2019; PBS 2018-2019. Scale 1" = 50' 0' 25' 50' 100' PREPARED FOR: HOLADAY PARKS. El PBS WATERS/WETLAND MAP HOLADAY PARKS SITE 4600 S. 134th PLACE TUKWILA, WASHINGTON APR 2019 41492.000 FIGURE 3 APPENDIX A Wetland Delineation Forms WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys and Coast Region Project/Site: 4625 S 134th Place, Tukwila, WA City/County: King Sampling Date: 4/5/2018 Applicant/Owner: Holaday Parks Investigator(s): Katharine M Lee Landform (hillslope, terrace etc.): toeslope State: WA Sampling Point: D-P1 Section/Township/Range: NE1/4 S15 T23N R4E Subregion (LRR): A - Northwest Forests and Coast Soil Map Unit Name: KpB Lat: 47.482707 Local relief: none Slope (%): 7 Are climatic / hydrologic conditions on the site typical for this time of year? Are Vegetation ,Soil , or Hydrology Are Vegetation ,Soil , or Hydrology significantly disturbed? naturally problematic? Long: -122.275182 Datum: WGS84 NWI Classification: none Yes x No (If no, explain in Remarks) Are "Normal Circumstances" present? (If needed, explain any answers in remarks) SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc. Yes x No Hydrophytic Vegetation Present? Hydric Soil Present? Wetland Hydrology Present? Yes X No Is the Sampled Area within a wetland? Yes X No Yes X No Yes X No Remarks: VEGETATION - Use scientific names of plants. Tree Stratum (Plot size: 30' r) 1. Populus balsamifera 2. 3. 4. Absolute Dominant Indicator % Cover Species? Status 50 Yes FAC Total Cover: 50 Sapling/Shrub Stratum (Plot size: 30' r) 1. Rubus armeniacus 50 Yes FAC 2. 3. 4. 5. Total Cover: 50 Herb Stratum (Plot size: 5' r) 1. Phalaris arundinacea 60 Yes FACW 2. Cirsium arvense 2 No FAC 3. 4. 5. 6. 7. 8. Woody Vine Stratum (Plot Size: 30' r) 1. 2. Total Cover: % Bare Ground in Herb Stratum Total Cover: 38 62 2 0 Dominance Test worksheet: Number of Dominant Species That Are OBL, FACW, or FAC: 3 (A) Total Number of Dominant Species Across All Strata: 3 (B) Percent of Dominant Species That Are OBL, FACW, or FAC: 100% (A/B) Prevalence Index worksheet: Total % Cover of: Multiply by: OBL species 0 x 1 = FACW species 60 x 2 = 120 FAC species 102 x 3 = 306 FACU species 0 x 4 = UPL species 0 x 5 = Column Totals: 162 (A) 426 (B) Prevalence Index = B/A = 2.63 Hydrophytic Vegetation Indicators: 1- Rapid Test for Hydrophytic Vegetation X 2- Dominance Test is >50% 3- Prevalence Index is 53.01 4- Morphological Adaptationsl (Provide supporting data in Remarks or on a separate sheet) 5- Wetland Non -Vascular Plants' Problematic Hydrophytic Vegetation' (Explain) 'Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. Hydrophytic Vegetation Present? Yes X No Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 z SOIL Sampling Point: D-P1 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence Depth Matrix Redox Features of indicators.) Texture Remarks (in.) Color (moist) % Color (moist) % Type' Loc2 0-8 10YR 4/2 100 silt loam 8-12 10YR 4/1 95 10YR 4/6 5 C M silt loam 12-18 2.5Y5/2 75 10YR4/6 25% C M loam 10YR 4/4 silty clay 'Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all! LRRs, unless otherwise noted.) Histosol (A1) Sandy Redox (S5) Indicators for Problematic Hydric Soils3: 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (Al 1 X Depleted Matrix (F3) 3lndicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Thick Dark Surface (Al2) Redox Dark Surface (F6) Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) Sandy Gleyed Matrix (S4) Redox Depressions (F8) Restrictive Layer (if present): Type: dense silty clay layer Hydric Soil Present? Yes X No Depth (inches): 12" Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (any one indicator is sufficient) Secondary Indicators (2 or more required), Surface Water (Al) Water -Stained Leaves (B9) (except MLRA Water -Stained Leaves (B9) (MLRA 1, X High Water Table (A2) 1, 2, 4A, and 4B) 2, 4A, and 4B) Drainage Patterns (B10) X Saturation (A3) Salt Crust (B11) Water Marks (B1) Aquatic Invertebrates (B13) Dry -Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost -Heave Hummocks (D4) Sparsely Vegetated Concave Surface (B8) Field Observations: Surface Water Present? Yes No X Depth (in): none Wetland Hydrology Present? Yes X No Water Table Present? Yes X No Depth (in): 10 Saturation Present? Yes X No Depth (in): 0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Aerial Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys and Coast Region Project/Site: 4625 S 134th Place, Tukwila, WA Appficant/Owner: Holaday Parks City/County: King Sampling Date: 4/5/2018 Investigator(s): Katharine M Lee Landform (hillslope, terrace etc.): river terrace State: WA Sampling Point: D-P2 Section/Township/Range: NE1/4 S15 T23N R4E Subregion (LRR): A - Northwest Forests and Coast Soil Map Unit Name: KpB Lat: 47.482746 Local relief: none Slope (%): 5 Are climatic / hydrologic conditions on the site typical for this time of year? Are Vegetation ,Soil Are Vegetation ,Soil , or Hydrology , or Hydrology significantly disturbed? naturally problematic? Long: -122.275264 Datum: WGS84 NWI Classification: none Yes x No (If no, explain in Remarks) Are "Normal Circumstances" present? (If needed, explain any answers in remarks) SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc. Yes x No Hydrophytic Vegetation Present? Hydric Soil Present? Wetland Hydrology Present? Yes No X Is the Sampled Area within a wetland? Yes No X Yes No X Yes No X Remarks: VEGETATION - Use scientific names of plants. Tree Stratum (Plot size: 30' r) 1. Pinus nigra 2. Salix lasiandra 3. 4. Sapling/Shrub Stratum (Plot size: 30' r) 1. Rubus armeniacus 2. 3. 4. 5. Total Cover: Herb Stratum (Plot size: 5' r) 1. Hedera helix 2. 3. 4. 5. 6. 7. 8. Total Cover: Woody Vine Stratum (Plot Size: 30' r) 1. 2. Total Cover: Bare Ground in Herb Stratum Total Cover: 80 Absolute % Cover Dominant Indicator Species? Status 30 Yes NL 15 Yes FACW 45 30 30 20 20 0 Yes Yes FAC 0 FACU Dominance Test worksheet: Number of Dominant Species That Are OBL, FACW, or FAC: 2 (A) Total Number of Dominant Species Across All Strata: Percent of Dominant Species That Are OBL, FACW, or FAC: 4 (B) 50% (A/B) Prevalence Index worksheet: Total % Cover of: Multiply by: OBL species FACW species FAC species FACU species UPL species Column Totals: 0 x 1 = 15 x2= 30 x 3 = 90 30 20 x 4 = 80 0 x5= 65 (A) 200 (B) Prevalence Index = B/A = 3.08 Hydrophytic Vegetation Indicators: 1- Rapid Test for Hydrophytic Vegetation 2- Dominance Test is >50% 3- Prevalence Index is _<3.0' 4- Morphological Adaptations) (Provide supporting data in Remarks or on a separate sheet) 5- Wetland Non -Vascular Plants' Problematic Hydrophytic Vegetation' (Explain) 'Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. Hydrophytic Vegetation Present? Yes No X Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 SOIL Sampling Point: D-P2 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence Depth Matrix Redox Features of indicators.) Texture Remarks (in.) Color (moist) % Color (moist) % Type' Loc2 0-18 7.5YR3/1 100 silt loam Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Histosol (A1) Sandy Redox (S5) 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (A11) Depleted Matrix (F3) 3lndicators of hydrophytic vegetation and wetland hydrology must be oreeent, unless disturbed or problematic. Thick Dark Surface (Al2) Redox Dark Surface (F6) Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) Sandy Gleyed Matrix (S4) Redox Depressions (F8) Restrictive Layer (if present): Type: Hydric Soil Present? Yes No X Depth (inches): Remarks: *Redox was not observed in this profile which may be due to the fact that it stays saturated continuously. There is an abrupt wetland boundary associated with a slope, creating a minimal transition zone. HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (any one indicator is sufficient) Secondary Indicators (2 or more required) 1, (C9) A) Surface Water (A1) Water -Stained Leaves (B9) (except MLRA Water -Stained Leaves (B9) (MLRA High Water Table (A2) 1, 2, 4A, and 4B) 2, 4A, and 4B) Drainage Patterns (B10) X Saturation (A3) Salt Crust (B11) Water Marks (B1) Aquatic Invertebrates (B13) Dry -Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) ShallowAquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stressed Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost -Heave Hummocks (D4) Sparsely Vegetated Concave Surface (B8) Field Observations: Surface Water Present? Yes No X Depth (in): none Wetland Hydrology Present? Yes No X Water Table Present? Yes No X Depth (in): >18 Saturation Present? Yes No X Depth (in): >18 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Aerial Remarks: Saturation at 10 inches in March does not constitute wetland hydrology US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 APPENDIX B Wetland Rating Forms Holaday Parks Tukwila lot Katharine Lee Slope Date(s) of Site Visit(s): 12/22/2017 Trained by Ecology? Yes Multiple HGM Classes? No Wetlands A WATER QUALITY FUNCTIONS Potential S1.1 Slope Slope is 1% or less - 3 Slope is 1% to 2% - 2 Slope is 2% to 5% -1 Slope is greater than 5% - 0 0 S1.2 Surface soils Clay or organic 0 S1.3 Vegetation Dense Uncut herbaceous vegetation >=90%area-6 >=1/2area-3 >=1/4area-1 3 Dense woody vegetation > = 1/2 area - 2 2 None of above - 0 Subtotal 5 Opportunity S2 Pollutants coming into wetland from grazing, untreated stormwater discharges, tilled fields, developed areas Yes: multiplier is 2, No: multiplier is 1 2 Total Water Quality Score 10 HYDROLOGIC FUNCTIONS Potential S3.1 Characteristics of vegetation Dense uncut rigid > 90% - 6 Dense uncut rigid > 1/2 - 3 Dense uncut rigid > 1/4 - 1 >1/4 mowed, grazed tilled or not rigid - 0 0 S3.2 Storage Depressional areas at least 10% of area Yes-2 No-0 2 Subtotal 2 Opportunity S4 Flood storage or Wetland drains to a river or stream that energy dissipation has flooding problems or impounds water that might otherwise contribute to downstream flooding Yes: multiplier is 2, No: multiplier is 1 2 Total Hydrologic Score 4 HABITAT FUNCTIONS Potential H1.1 Vegetation structure Number of vegetation types: Aquatic bed, emergent plants, scrub/shrub,forested, forested with at least 3 strata. >= 4 types = 4 3 types = 2 2 types = 1 1 type = 0 1 H1.2 Hydroperiods Permanently flooded or inundated Seasonally flooded or inundated Occasionally flooded or inundated Saturated only Permanent stream in or adjacent Seasonal stream in or adjacent >= 4 types = 3 3 types = 2 2 types = 1 lake -fringe = 2, freshwater tidal = 2 1 Holaday Parks Tukwila lot Date(s) of Site Visit(s): 12/22/2017 H1.3 Plant species diversity Number of species covering > 10 sq ft Do not count reed canarygrass, purple loosestrife, Canada thistle > 19 species = 2 5-19 = 1 < 5 =0 1 H1.4 Habitat interspersion None = 0 low=1 moderate = 2 high = 3 1 H1.5 Special habitats 1 point for each of the following: *large downed woody debris *standing snags *undercut banks at least 2m long or overhanging vegetation at least 1m x 10m *stable steep banks of fine material *at least 1/3 acre thin -stemmed persistent vegetation *invasive plants cover less than 25% of wetland area in each 1 Subtotal 5 Opportunity H2.1 Buffers see text next page 2 H2.2 Corridors and connections Vegetated corridor >=150ft wide with >= 30% cover that connects to > 250 acre block = 4 Vegetation corridor >= 50 ft wide with >= 30% cover that connects to > 25 acre block, or lake fringe = 2 Wetland is within 5 mi of salt water esturary, or 3 mi of field or pasture > 40 acres or within 1 mi of a lake > 20 acres =1 0 H2.3 Near priority habitats Number of priority habitats within 100m of wetland: 3ormore=4 2=3 1=1 0 H2.4 Wetland landscape At least 3 other wetlands within 0.5 miles with relatively undisturbed connections = 5 At least 3 other wetland with 0.5 miles but connections are disturbed = 3 At least 1 other wetland within 0.5 miles =2 No wetlands within 0.5 miles = 0 2 Subtotal 4 Total Habitat Score 9 TOTAL SCORE 23 CATEGORY 4 100 m of relatively undisturbed areas >95% circumference 100 m of relatively undisturbed areas> 50% of cirmcumference 50 m of relatively undisturbed areas > 95% circumference 100 m of relatively undisturbed areas>25% circumference 50 m of relatively undisturbed areas > 50% circumference If none of above No paved areas or buildings within 25m for 95% circumference (light to moderate grazing and lawns OK) No paved areas or buildings within 50m for > 50% circumference (light to moderate grazing and lawns OK) Heavy grazing in buffer Vegetated buffers are< 2m wide for more than 95% of circumference None of above Rating Summary Wetland HGM Rating S Water Quality 10 Hydrology 4 Habitat 9 Total 23 Category IV Appendix B Revised Buffer Enhancement Plan Revised Buffer Enhancement Plan for Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington 98168 Revised September 2019 PBS Project 41492.000 PBS 214 E. GALER STREET SEATTLE, WA 98102 206.233.9639 MAIN 866.727.0140 FAX PBSUSA.COM Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington TABLE OF CONTENTS 1 INTRODUCTION 1 2 LOCATION AND SETTING 2 3 EAST FORK SOUTHGATE CREEK 3 3.1 Existing Condition of Stream 3 4 WETLAND A 3 4.1 Existing Conditions 4 5 PRESCRIPTIVE BUFFERS 4 6 IMPACT ASSESSMENT 4 7 REGULATORY COMPLIANCE 4 8 BUFFER ENHANCEMENT PLAN 6 8.1 Overall Plan 6 8.2 Mitigation Goals and Objectives 6 8.3 Clearing/Grading/Site Preparation 7 8.4 Plantings 8 8.5 Performance Standards 8 8.6 Maintenance and Monitoring of Restoration 11 8.7 Contingency Measures 12 8.8 Performance Security 12 8.9 Conclusions 12 9 REFERENCES 13 SUPPORTING DATA TABLES Table 1. Plant Schedule Table 2. Performance Standards PHOTOGRAPHS FIGURES Figure 1. Site Vicinity Figure 2. City of Tukwila Mapped Wetlands and Streams Figure 3. Water/Wetland Standard Buffers ©2019 PBS Engineering and Environmental Inc. PBS September 11, 2019 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 1 INTRODUCTION PBS was contacted by Holaday-Parks, Inc. (Holaday-Parks) regarding a property in Tukwila that the company owns across the street from their main company offices. A single-family residence was removed from the premises in late summer 2017 and portions of the lot were graded and additional gravel was laid down for use as parking. The City of Tukwila (City) issued a notice of violation in November 2017, citing unauthorized use of the lot for employee parking and unpermitted disturbance of a critical area buffer (a stream flows within the S 134th Place right-of-way, which adjoins the northeast edge of the property). The purpose of this buffer enhancement plan is to bring the site into compliance with the City's requirements and provide a framework for restoration and enhancement of the buffers in order to address the violation and allow the owner to use of the property to construct a 240-square-foot storage facility and associated parking. This wetland mitigation plan has been prepared according to Tukwila Municipal Code (TMC) 18.45.090.D, as detailed below: I. The mitigation plan shall be developed as part of a sensitive area study by a specialist approved by the Director. Wetland and/or buffer alteration or relocation may be allowed only when a mitigation plan clearly demonstrates that the changes would be an improvement of wetland and buffer quantitative and qualitative functions. The plan shall follow the performance standards of TMC Chapter 18.45 and show how water quality, wildlife and fish habitat, and general wetland quality would be improved. This Buffer Enhancement Plan and the associated drawings have been prepared by Professional Wetland Scientists and Landscape Architects with experience in the design and implementation of compensatory mitigation projects in western Washington State. The proposed mitigation will replace landscape plantings present on the site before the demolition and gravel work with native species and provide for control of invasive plant species at the site. These changes in vegetation composition will improve habitat function in the wetland and riparian buffers. The proposed improvements include a stormwater system that will disperse runoff from the site in the buffer, improving stream water quality from the prior condition. 2. The scope and content of a mitigation plan shall be decided on a case -by -case basis taking into account the degree of impact and the extent of the mitigation measures needed. As the impacts to the sensitive area increase, the mitigation measures to offset these impacts will increase in number and complexity. This enhancement plan focuses on restoration of lost buffer functions, and the scope and content of the plan reflect the level of detail necessary to document restoration of impacts of this nature. 3. For wetlands, the format of the mitigation plan should follow that established in Wetland Mitigation in Washington State, Part 2 — Developing Mitigation Plans (Washington Department of Ecology, Corps of Engineers, EPA, March 2006 or as amended). The proposed Buffer Enhancement Plan generally follows the outline and level of detail described in Wetland Mitigation in Washington State, Part 2 — Developing Mitigation Plans. 4. The components of a complete mitigation plan are as follows: a. Baseline information of quantitative data collection or a review and synthesis of existing data for both the project impact zone and the proposed mitigation site. PBS September 11, 2019 1 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Baseline information regarding the site is provided in Sections 1-5 of this report. Additional detail regarding the wetland delineation is provided in the Waters/Wetlands Delineation Report Parcel #2613200051, 4625 5 134th Place Tukwila, Washington (PBS June 2018, Revised April 2019). b. Environmental goals and objectives that describe the purposes of the mitigation measures. This should include a description of site selection criteria, identification of target evaluation species and resource functions. The proposed on -site enhancement includes goals and objectives in Section 8.2. On -site mitigation was selected based on minimization of impacts, proximity to the affected resources, and the capacity to support improved buffer function. This approach is consistent with Ecology's watershed -based approach to mitigation site selection. c. Performance standards of the specific criteria for fulfilling environmental goals and for beginning remedial action or contingency measures. They may include water quality standards, species richness and diversity targets, habitat diversity indices, or other ecological, geological or hydrological criteria. Section 8.5 of this Buffer Enhancement Plan provides details on the proposed performance standards for water quality, habitat function, species richness and diversity, and other functions as identified in the proposed goals and objectives (Section 8.2). d. A detailed construction plan of the written specifications and descriptions of mitigation techniques. This plan should include the proposed construction sequence and construction management, and be accompanied by detailed site diagrams and blueprints that are an integral requirement of any development proposal. Sections 8.3 and 8.4 of the Buffer Enhancement Plan provide details on construction sequencing, including grading, site preparation, and plant: installation and spacing. Additional detail and specification are provided on the planting plan drawing sheets submitted with the report. e. A monitoring and/or evaluation program that outlines the approach for assessing a completed project for the specified monitoring period. An outline shall be included that spells out how the monitoring data will be evaluated by agencies that are tracking the mitigation project's progress. Section 8.6 of the Buffer Enhancement Plan provides the details on monitoring and maintenance activities for the enhancement. f Contingency plan identifying potential courses of action and any corrective measures to be taken when monitoring or evaluation indicates project performance standards have not been met. Section 8.5 of the Buffer Enhancement Plan includes contingency measures to address failure to meet the performance standards. g. Performance security or other assurance devices as described in TMC Section 18.45.210. Performance security for the project is discussed in Section 8.8. 2 LOCATION AND SETTING The Holaday-Parks property (Property) is located at 4625 S 134th Place just west of the junction of Interstate 5 and State Route 599 within the city limits of Tukwila, Washington (Figure 1). It is within the NE 1/4 of Section PBS September 11, 2019 2 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 15, Township 23N, Range 4E. The coordinates of the center of the property are Latitude 47.482559, Longitude -122.274869. The Property is in the Duwamish River Valley drainage. Elevations at the site range from 25 feet above sea level (asp on the northeast boundary to 45 feet asl at the southwest boundary. The parcel is roughly rectangular in shape, measures 67 to 77 feet wide by 250 feet long, and totals 0.42 acre in size. Access to the Property is provided by an existing gravel driveway from S 134th Place. Neighboring properties to the southeast and southwest are currently in single-family residential use, while properties to the north and west are in commercial and light industrial uses. The current zoning for the parcel is commercial/light industrial. 3 EAST FORK SOUTHGATE CREEK The City of Tukwila identifies the stream that flows along the southwest side of S 134th Place in front of the property as the east fork of Southgate Creek (East Fork Southgate Creek). The City's Sensitive Areas Maps (Figure 2) identify the stream as a Type 2 watercourse. Type 2 watercourses are defined as "those watercourses that are known to be used by fish or meet the physical criteria to be potentially used by fish and that have perennial (year-round) or seasonal flows." According to the City of Tukwila's 2013 Surface Water Comprehensive Plan, coho salmon are potentially present in East Fork Southgate Creek, along with resident trout and other types of non-anadromous fish. Some rearing habitat is assumed to be present along S 134th Place. 3.1 Existing Condition of Stream Development in the area has dramatically changed East Fork Southgate Creek from its historical condition. A review of historical aerial photographs shows that the portion of East Fork Southgate Creek nearest the Property has been confined in a roadside ditch since at least the 1930s. The stream passes through a number of culverts that provide access to adjacent properties. A 38-foot-long, 42-inch-wide oval corrugated metal pipe culvert passes under the driveway to the Property. The driveway is approximately 20 feet wide, spanning the central portion of the culvert. Upgradient of the culvert, the stream has a width of 5 to 6 feet at the ordinary high water mark (OHWM). Downstream of the culvert (northwest of the Property), the stream widens to 8 to 9 feet at the OHWM, and a rock retaining wall is located along at the road shoulder. Nearest the property, the northern streambank is composed of roadway fill for S 134th Place. This slope is near vertical and subject to erosion and slumping; the surface includes gravels, chunks of old asphalt pavement, and similar man-made material. The bank on the Property side are steep with slopes of up to 80 percent, rising approximately 4 to 6 feet to a break in slope. The stream gradient in front of the Property was approximately 4 percent and at the time of the site visit, water was flowing quite rapidly. Further downstream, the stream gradient becomes flatter. Armoring is present along the sides of the stream, and rock and concrete pieces are also present in the stream. The streambed is composed mostly of silt, sand, and gravels and some small cobbles, with sparse vegetation. The OHWM of the stream is located between 3 to 6 feet north of the parcel boundary; as a result, the stream channel is entirely within the City's right-of-way for S 134th Place. 4 WETLAND A The City of Tukwila maps (Figure 2) do not show wetlands at the Property. PBS staff conducted a wetland delineation and identified one wetland at the site (Wetland A). Details of Wetland A are provided in the project's wetland delineation report, and a summary is provided below. El PBS September 11, 2019 3 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 4.1 Existing Conditions Wetland A is located on the southwestern end of the parcel, extending from the base of the retaining wall to the gravel paved area in the center of the site. A commercial property and associated paved parking is located to the northwest, and residential development borders the parcel to the south and southwest. Wetland A is a forested palustrine wetland with seasonal saturation (Cowardin et al., 1979), and was rated as Category IV slope wetland using the Washington State Rating System for Western Washington from 2004 (TMC 18.45.080(B)). The total wetland score is 23, with a water quality score of 10, a hydrology score of 4, and a habitat score of 9. 5 PRESCRIPTIVE BUFFERS Type 2 streams (including East Fork Southgate Creek) in the City of Tukwila have a 100-foot standard buffer width (Tukwila Municipal Code [TMC]18.45.100(C)). Buildings must be set back an additional 15 feet, and other development must be set back 10 feet from the edge of the buffer. Category IV wetlands (including Wetland A) in the City have a 50-foot standard buffer width (TMC 118.45.080(D)), and the building setbacks are similar to those required for streams. 6 IMPACT ASSESSMENT In August 2017, Holaday-Parks obtained a permit from the City to demolish the single-family residence on the Property. Most of the approximately 1,000-square-foot house was located within the standard 100-foot buffer. After the house was demolished, the area was graded and covered with gravel. A portion of what had been lawn with a few ornamental shrubs on the north side of the house toward the stream was also converted to gravel. The vegetated area that was converted to gravel appears to have measured approximately 1,000 square feet. The critical areas violation issued by the City pertains to both the portion of the house that was in the buffer and the lawn area. Under City of Tukwila Code (TMC 18.70.40), the house and yard would have been nonconforming uses, which would have been allowed to continue, but once the house was demolished, the footprint of the house reverted to buffer. No impacts occurred to the stream or the first 35 feet of the buffer. 7 REGULATORY COMPLIANCE Under the current zoning use, application of the standard buffers and applicable setbacks for Wetland A and East Fork Southgate Creek occupy the entire parcel (Figure 3) and deny the client any reasonable use of the Property. The Code for wetland buffers (TMC 18.45.80.(F)(1)) notes that: "The Director may reduce the standard wetland buffers only where the buffer conditions are currently degraded (due to existing development within the prescribed buffer width, the presence of significant amount of invasive vegetation that impairs buffer function, and/or lack of native vegetation) on a case -by -case basis, provided the remaining buffer is enhanced and the buffer does not contain slopes 15 percent or greater. Where a buffer has a variable topography that includes Class 1 slopes on the landward half of the buffer, a buffer reduction may be allowed if the proposed reduction is in the area with the Class 1 slopes, and a 10-foot planted setback from the top of the slope is maintained. Further, a geotechnical review of the proposed buffer enhancement plan must determine the buffer enhancement can be implemented without destabilizing the slope. The approved buffer width shall not result in greater than a 50 percent reduction in width." TMC 18.45.100.E. states the following for stream buffer variation: PBS September 11, 2019 4 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington The Director may reduce the standard watercourse buffers on a case -by -case basis, only where the buffer is significantly degraded (due to existing development within the prescribed buffer width, the presence of significant amount of invasive vegetation that impairs buffer function, and/or lack of native vegetation), provided the remaining buffer is enhanced in accordance with an approved buffer enhancement plan, prepared by a qualified professional, and does not contain slopes 15% or greater. Where a buffer has a variable topography that includes Class I slopes on the landward portion of the buffer, a buffer reduction may be allowed if the proposed reduction is in the area with the Class I slopes, and a 10 foot planted setback from the top of the slope is maintained. Further, a geotechnical review of the proposed buffer enhancement plan must determine that the buffer enhancement can be implemented without destabilizing the slope. The approved buffer width shall not result in greater than a 50% reduction in width. Any buffer reduction proposal must demonstrate to the satisfaction of the Director that it will not result in direct, indirect or long-term adverse impacts to watercourses, and that: a. The buffer is vegetated and includes an on -site buffer enhancement plan prepared by a qualified professional, to retain existing native vegetation and install additional native vegetation in order to improve the buffer function; or b. If there is no significant vegetation in the buffer, a buffer may be reduced only if an on -site buffer enhancement plan is provided. The plan must include using a variety of native vegetation that improves the functional attributes of the buffer and provides additional protection for the watercourse functions. Buffer Degradation: Prior to the Applicant's alterations to the site, the existing buffers were significantly degraded. The buffers for Wetland A and East Fork Southgate Creek are significantly degraded by development within the prescribed buffers and the presence of significant amounts of non-native and invasive vegetation. Surrounding land uses have reduced or eliminated buffers throughout the area. The past use of the Property as a residence has reduced the width of the natural buffers on the site, and the existing vegetation in both of the buffers is dominated by non-native and invasive species. Water from the residential parcel(s) to the south is being collected and discharged into Wetland A via a pipe on the Applicant's property. It is unclear if this discharge was previously permitted. The effects of these past development activities severely limit performance of wetland buffer functions, such as water quality improvement through filtration, hydrologic support and delay of inflows through infiltration, and wildlife habitat function supported by species diversity, structural diversity, and connectivity. Riparian functions have been significantly degraded by the channelization of East Fork Southgate Creek along S 134th Place, loss of all habitat on the roadward side, the placement of an extensive network of culverts and driveways along the stream, and subsequent development of the area for residential and commercial uses. These activities have severely reduced infiltration that supports stream base flows and reduces flashiness of stream discharges; canopy cover that provides shading and reduces stream temperature; organic inputs to the stream that support the food web for aquatic species; potential woody debris recruitment that supports normal stream geomorphic processes; habitat connectivity and diversity that would support migration corridors for terrestrial species; and perching, nesting, and foraging habitat for avian species. Buffer Enhancement: The Applicant proposes enhancement in the remaining buffers with native woody species to improve habitat function. A buffer enhancement plan has been prepared by qualified professionals in the fields of Wetland '011,3 PBS September 11, 2019 5 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Science and Landscape architecture. Slopes greater than 15 percent are present only in a narrow zone (approximately 10 feet wide) immediately above the ordinary high water mark (OHWM) of South Fork Eastgate Creek. The remaining buffer areas have slopes of approximately 10 percent. The proposed reduced buffer is not greater than a 50 percent reduction in width and will not result in direct, indirect or long-term adverse impacts to watercourses. The area described in the proposed Buffer Enhancement Plan was previously vegetated to varying degrees and the plan will retain existing native vegetation and install additional native vegetation in order to improve the buffer function. We believe this proposal satisfies the criteria outlined in TMC 18.45.100.E. As a result of the restriction on reasonable use resulting from the prescribed standard buffers, the Applicant is requesting a reduction in the buffer widths to 50 percent of the standard buffer widths, as outlined in TMC 18.45.80(F) and 18.45.100(E). The proposed development at the site has been reduced to the minimum practicable while allowing some use of the site, and a buffer enhancement plan is provided below to meet the criteria outlined in the above cited code sections. 8 BUFFER ENHANCEMENT PLAN The following buffer enhancement plan has been prepared by a professional wetland scientist to meet the criteria listed in TMC 18.45.90(D) and 18.45.100(E). The plan provides improved critical area protection compared to the existing degraded condition, and incorporates removal of non-native species, enhancement of soils, and planting native woody upland vegetation that improves water quality, hydrology, and habitat function in the buffers of Wetland A and East Fork Southgate Creek. Construction of stormwater facilities at the Property and establishment of native buffer vegetation will improve water quality by reducing or slowing surface flows to the stream. Site preparation activities will de - compact the earth in the planting areas, improving potential infiltration and supporting the functions of Wetland A and East Fork Southgate Creek. The plantings are composed of native woody species that will provide habitat currently absent or severely limited at the Property, increase canopy cover to assist in cooling of stream and wetland microhabitats, improve foraging opportunities for smaller species of wildlife, and providing perching, nesting and foraging opportunities for avian species. These enhancement activities are expected to result in an overall improvement compared to the current degraded buffer conditions at the Property. 8.1 Overall Plan The goal of the enhancement plan will provide improved buffer function while allowing reasonable use of the of the Property by the Applicant. The driveway would remain approximately in its current location to avoid having to move or replace the existing culvert. The proposed stream and wetland buffer would be reduced to 50 percent of the standard buffer width (50 feet for East Fork Southgate Creek, and 25 feet for the wetland), and the remaining buffers will be enhanced with native wood species to provide improved cover and forage for wildlife. Enhancement of the reduced buffers will also include removal of non-native and invasive species. The proposed improvements will incorporate pervious pavement and a stormwater dispersion to improve the quality of stormwater leaving the site. 8.2 Mitigation Goals and Objectives The following section outlines the proposed goals and objectives for the buffer enhancement at the Holaday- Parks site. The goals describe the overall intent of the mitigation activities, while the objectives identify components to achieve the goals. The goals and objectives are supported by performance standards, which provide qualitative targets to determine whether the mitigation objectives (and corresponding goals) are being met. PBS September 11, 2019 6 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington For the Holaday Parks Site, we have identified goals to address deficiencies in water quality, habitat function, the presence of non-native and invasive species, and native species diversity. Goal 1: Improve Water Quality Stormwater from the site currently drains directly into East Fork Southgate Creek. This direct discharge of runoff likely includes fine sediments which degrades stream habitat function. Direct runoff also contributes to flashy stream flows after rain events, which is a factor that increases erosion in urban streams. Objectives: The proposed enhancement will improve water quality by capturing particulate in the stormwater and slowing discharges to the stream through implementation of the following objectives: • Objective 1.1: Install a stormwater treatment system to capture particulates on -site • Objective 1.2: Discharge stormwater into the stream buffer to slow the rate at which runoff leaves the site Goal 2: Improve Habitat Function in Wetland and Stream Buffers Buffer functions at the Holaday-Parks site reflect the transition of land in the area from agriculture to residential and commercial uses. As a result, the buffers are relatively narrow, dominated by non-native species, and the habitat is highly fragmented. The proposed enhancement will improve buffer habitat function from the previous (residential) condition. Objectives: The proposed enhancement will improve water quality by capturing particulate in the stormwater and slowing discharges to the stream through implementation of the following objectives: • Objective 2.1: Provide native canopy cover through dense planting • Objective 2.2: Screen wetland and stream from the parking area with woody plants • Objective 2.3: Support complex vertical structure (three stratum present) • Objective 2.3: Improve forage by providing three native fruiting species Goal 3: Increase Native Plant Diversity Much of the existing buffer vegetation at the Holaday-Parks site consists of residential lawn, and landscape species. Goal 3 is to improve native plant diversity and control invasive species at the site through planting and ongoing maintenance activities. Objectives: Native plant diversity will be increased through implementation of the following objectives: • Objective 3.1: Establish ten native woody plant species on the site • Objective 3.2: Control invasive species and noxious weeds on the site 8.3 Clearing/Grading/Site Preparation The existing culvert under the driveway will be maintained and a driveway easement will be preserved to allow access to the site. A silt fence or other BMP will be installed above OHWM to protect the stream until work areas are stabilized. All non-native vegetation will be cleared from the existing buffer area, and gravel areas within the proposed buffer will be removed. Planting area will be mechanically ripped or cultivated to a depth of 6 inches and rocks over 2 inches will be removed. Up to 6 inches of clean topsoil will be imported as PBS September 11, 2019 7 PBS Project 41492.000 Revised Buffer Enhancement Plan Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington needed to support planting. Three inches of fine compost will be placed on the planting areas, and the compost will be incorporated to a depth of 6 inches. An additional 3 inches of compost will be added prior to planting. Following planting, 3 inches of bark mulch will be placed in non -grass areas. 8.4 Plantings The enhancement area will be planted with native trees, shrubs, and a ferns. Any areas in the proposed driveway easement that are disturbed will also be seeded to prevent erosion. Planting is anticipated to occur between late fall 2019 and spring 2020. The proposed plant schedule and for the buffer is shown below. Planting areas and details are shown in the project plan set, Sheets C-401 and C-402. Table 1. Plant Schedule for the Holaday-Parks Property Common Name Scientific Name Strata Number Size Condition Spacing Wetland Enhancement Planting (280 sq ft, 0.02 acre) Red Osier dogwood Cornus sericea (C. alba) S 8 18" min. ht. Bare root 5' OC Salmonberry Rubus spectabilis S 7 18" min. ht. Bare root 5' OC Subtotal 15 Buffer Enhancement Planting (5,249 sq ft, 0.12 acre) Vine maple Acer circinatum T 6 1 gal. Container 10' OC Black cottonwood Populus balsamifera T 5 18" min. ht. Bare root 10' OC Bitter cherry Prunus emarginata T 5 18" min. ht. Bare root 10' OC Douglas fir Pseudotsuga menziesii T 20 10" plug Container 10' OC Western red cedar Thuja plicata T 10 10" plug Container 10' OC Low Oregon grape Berberis nervosa S 52 1 gal. Container 5' OC Swordfern Polystichum munitum F 62 1 gal. Container 5' OC Snowberry Symphoricarpos albus S 62 18" min. ht. Bare root 5' OC Subtotal 222 Strata: H=herbaceous, F=fern, S=shrub, T=tree. 8.5 Performance Standards Performance standards for wetlands and streams were developed according to TMC 18.45.090.E (wetlands) and TMC 18.45.110 (streams), respectively. TMC 18.45.090.E.2 identifies the following minimum performance standards for approved wetland alterations: a) Wetland functions improved over those of the original conditions. The proposed mitigation includes dense plantings of native woody species that provide cover and forage for wildlife species, resulting in an improvement over wetland function prior to the alterations. b) Hydrologic conditions and hydroperiods are improved over existing conditions and the specific hydrologic performance standards specified in the approved mitigation plan are achieved. The site slopes from southwest to northeast. As a result, water appears to enter Wetland A largely in the form of direct precipitation and from the stormwater pipe entering the wetland from the south, and the northern buffer does not appear to provide a significant portion of the water that supports the hydrology of Wetland A. c) Acreage requirements for creation, re-establishment, rehabilitation or enhancement and for proposed wetland classes are met. El PBS September 11, 2019 8 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Not Applicable. The proposed enhancement does not include compensatory mitigation. d) Vegetation native to the Pacific Northwest is installed and vegetation survival and coverage standards over time are met and maintained The proposed plantings consisted of native northwest species suitable to the conditions at this location. The plan and construction drawings include methods for installation, performance standards, and a maintenance schedule, and contingency measures to ensure that standards for plant survival and cover goals are met over time. e) Habitat features are installed, if habitat is one of the functions to be improved. The proposed buffer enhancement plan does not include habitat features. Improvements to habitat function will be provided through the installation of native woody shrubs that provide forage and cover for wildlife, and tree species that increase vertical complexity in the riparian buffer. f) Buffer and bank conditions and functions exceed the original state. The proposed buffer enhancement includes native woody plants that will intercept precipitation to slow runoff and desynchronize stream discharge, stabilize stream banks, and provide improved habitat function. These enhancement activities will result in an improvement in buffer conditions from the pre - alteration site condition. Bank conditions to the south will be improved by installation of native woody species that replaces the existing landscaping. TMC 18.45.110.0 notes that stream mitigation plans will include: Performance standards for fulfilling environmental goals and objectives and for triggering remedial action or contingency measures. Performance standards may include water quality standards, species richness and diversity targets, habitat diversity indices, creation of fish habitat, or other ecological, geological or hydrological criteria. Please note that East Fork Southgate Creek is located to the north of the parcel, within the City of Tukwila owned right-of-way. The Applicant has not altered the watercourse and does not propose any alterations to the bed or bank of the stream. All proposed enhancement activities will take place on the Applicant's parcel and will be above the OHWM and top of bank of the stream. Water Quality: The proposed improvements at the site include stormwater treatment that will disperse stormwater in a dispersal trench, and will improve the quality of water leaving the site and entering East Fork Southgate Creek. Species richness and diversity: The proposed enhancement includes four native tree species, five native shrubs, and one native herbaceous species. The species were selected to provide a multiple layered habitat, dominated by native woody species that provide species diversity and that replicate native habitat. A species richness and diversity performance standard has been incorporated to ensure that all ten native species are present on the site at the end of the monitoring period. Habitat diversity indices: Not Applicable. PBS September 11, 2019 9 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington Creation of fish habitat: Not Applicable. Previous work at the site did not alter fish habitat in East Fork Southgate Creek, and the proposed enhancement does not include fish habitat creation or enhancement. Other ecological, geological or hydrological criteria: The proposed riparian buffer enhancement includes native plants that will intercept precipitation to slow runoff and desynchronize stream discharge, stabilize stream banks, and provide improved habitat function. These enhancement activities will result in an improvement in buffer conditions from the pre -alteration site condition. Bank conditions to the south will be improved though the installation of native woody species that replaces the existing landscaping, which is dominated by non-native species. The success of the enhancement area will be measured according to whether the following performance standards are being met. Table 2 shows the performance standards that will be used to measure restoration success. 111 PBS September 11, 2019 10 PBS Project 41492.000 Revised Buffer Enhancement Plan Holaday-Parks, Inc. 4625 S 134th Place Tukwila, Washington Table 2. Performance Standards Thresholds Parameter Year 1 Year 3 Year 5 Water Quality Improvement Stormwater Discharge Pervious pavement and dispersion trench installed as specified in plans Stormwater system functioning Runoff from site discharged to buffer Stormwater from site d scharged into dispersion trench in buffer Buffer Habitat Improvement Canopy cover and screening (trees and shrubs) Support complex vertical structure Improved forage Native Plant Diversity >10 >20 >50 Three stratum (native trees, shrubs and herbaceous species) present in enhanced buffer Three native fruiting species present in enhanced buffer Plant diversity - # of native species Invasive species cover percentage' Plant Establishment <5% >10 native species <5% <5% Survival of planted trees 100% 100% 90% Survival of planted shrubs 90% 80% 70% Percent cover native species2 10% 20% 50% Erosion Control Site stability post construction No turbid water from the site entering the stream N/A N/A 1. Invasives include Japanese knotweed, Himalayan blackberry, Scots' broom, English ivy, holly, horse chestnut and any species listed on the King County noxious weed list. 2. Includes native volunteers. 8.6 Maintenance and Monitoring of Restoration The restoration/enhancement plantings and grading will be monitored for 5 years. We are proposing a baseline monitoring, yearly monitoring in Years 1, 2, and 3, and then a final monitoring in Year 5. Additional monitoring beyond Year 5 may be required if performance standards are not being met. Once planting is complete, a Baseline Monitoring Report will be submitted to the City that includes an as -built drawing and a more detailed Monitoring Plan. The as -built report will document any grading and site preparation activities, as well as the new plantings. Specific monitoring protocol will be provided in the Baseline Monitoring Report. Once approved by the City, this plan will form the basis for evaluating the success of the enhancement area. During the first two years, all planted stock will be replaced either in kind or with another approved native species if diseased, dead, or dying. Weeding and removal of invasives will need to occur twice a year during the monitoring period. Additional maintenance may be required. Native volunteers will not be removed unless they are compromising the goals of the enhancement. Reports will be submitted to the City before the end of each calendar year in Years 1, 2, 3, and 5. The monitoring report will include the following basic information: PBS September 11, 2019 11 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington • A tally of planted trees and shrubs • Estimates of native species cover by species • Vigor and mortality of planted stock • Percent cover of invasive weed species • Assessment of other non -natives to determine if control is needed • Photographs at established photo points • Recommended contingency measures to replace mortality or control weeds • Observations on the overall status of the enhancement area and any unauthorized activities 8.7 Contingency Measures Contingency measures will be triggered if the performance standard thresholds are not being met as documented during the yearly monitoring. All planted stock mortality in the first year will be replaced either in -kind or with a replacement species approved by the wetland biologist. Some species substitutions may be needed if the original species is not performing well. Any replacement plantings will occur either in the fall or spring. Additional weed control will be triggered if invasive species become established that threaten the success of the restoration. If erosion is occurring, additional stabilization methods will need to be employed. 8.8 Performance Security TMC 18.45.210 requires a performance security of 150 percent the cost of mitigation installation plus the cost of maintenance and monitoring for five years. Based on the King County Mitigation Bonding worksheet provided by the City, the value of the mitigation work (including 5 years of maintenance and monitoring) was estimated at $31,686.40 (see attached). A performance bond will be provided by the Client for 150 percent of this cost, or $47,529.60. 8.9 Conclusions We trust that this revised Buffer Enhancement Plan is responsive to your request for additional information. Respectfully submitted (September 2019), Digitally signed by Patrick J. Togher, PWS Date: 2019.09.20 08:43:31 -07'00' Patrick J. Togher Professional Wetland Scientist #1659 El PBS September 11, 2019 12 PBS Project 41492.000 Revised Buffer Enhancement Plan 4625 S 134th Place Holaday-Parks, Inc. Tukwila, Washington 9 REFERENCES CH2MHill. 2013. City of Tukwila 2013 Surface Water Comprehensive Plan. City of Tukwila Municipal Code. 2018. Chapter 18.45. Environmentally Sensitive Areas. Accessed online at: http://records.tukwilawa.gov/WebLink/1/edoc/56618/Tukwila°%20Municipal%20Code%20- %20TitIe%2018%20-%20Zoning.pdf City of Tukwila. 2011. Special Permission — Director Information Sheet. City of Tukwila Sensitive Areas Map. 2018. Accessed online at: http://www.tukwilawa.gov/wp- content/uploads/2015/11 /Sensitive-Areas-Map.pdf Google Earth. 2017. Online aerial photographs. King County IMAP. 2017. Accessed online at: http://www.kingcounty.gov/operations/GIS/Maps/iMAP.aspx NRCS Web Soil Survey. 2017. Accessed on-line at: http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx Pojar J. and A. MacKinnon. 2004. Plants of the Pacific Northwest Coast - Revised. Lonepine Publishing WA Department of Fish and Wildlife (WDFW). 2017.Priority Habitats and Species on the Web. Accessed online at: http://apps.wdfw.wa.gov/phsontheweb/ WA Department of Fish and Wildlife (WDFW). 2018. Salmonscape. Accessed online at: http://apps.wdfw.wa.gov/salmonscape/ WTU Herbarium Image Collection. 2017. Burke Museum of Natural History and Culture. Accessed online at: http://biology.burke.washington.edu/herbarium/imagecol►ection.php PBS September 11, 2019 13 PBS Project 41492.000 PHOTOGRAPHS Photo 1. Google Earth aerial of property taken in June 2016 prior to removal of house. Photo 2. Google Earth street view looking northwest from S 134th Place showing East Fork Southgate Creek in a ditch along the side of the road with a steep bank up to the subject property. Photo 3. View to east of stream in roadside ditch along S 134th Place. Photo 5. Edge of gravel fill with silt fence. Demolished house was just to the right of the picture. Undisturbed portion of stream buffer to the left. Photo 7. Buffer area with non-native cherry laurel, blackberry, and ivy dominant. Photo 4. View to west of stream below property with end of driveway culvert in foreground. Additional driveway culverts in background. Photo 6. View to east of buffer at southeast property corner with larger horse chestnut tree covered with ivy and small horse chestnuts sprouting around it. Photo 8. Buffer area at top of steep bank showing erosion on north side of stream channel along road. FIGURES c, 140th St S ?41tf S 143ths1 (i) S 148th St r S 153th St h St -r 0 160th St it.V.410.3tabo -11.2.2,WOZVO0 tir tS 406, , f Oft Pat k 00.'"4"4c'j 1,1 Tukwila estto1c1 0 Bong Longac re s IN PBS PROJECT # 41492 DATE JAN 2018 PROJECT VICINITY MAP Holaday-Parks Property Tukwila, Washington FIGURE 1 Legend ED Tukwila City Limits • Potential Watercourse Daylighting Sites Type 2 Stream - Type 2 Stream in Pipe — Type 3 Stream — Type 3 Stream in Pipe -- Type 4 Stream — Type 4 Stream in Pipe Type 2 Watercourse Buffer (100') i Type 3 Watercourse Buffer (80') i Type 4 Watercourse Buffer (50') ..w, Potential Wetlands ia Category I & II Wetland Category III Wetland Category IV Wetland ❑ Category I & 11 Wetland Buffer (100') Category III Wetland Buffer (80') L..i Category IV Wetland Buffer (50') $IPIR ' sus ct - $st:ST CITY OF TUKWILA SENSITIVE AREAS Holaday-Parks Property Tukwila, Washington PROJECT # 41492 DATE JAN 2018 S 14I St IN FIGURE 2 nh,Pn Ian I Projects\41000\41492 Holadav Parks\Mapping\Map Buffers.mxd nal]t;or SOURCE: King County iMap aerial imagery, 2017. King County parcel boundaries. PBS Engineering and Environmental, Inc. Waters/Wetland Delineation Legend Parcel n Wetland (Cat. IV) OHWM Wetland Buffer (50 Feet) OHWM Buffer (100 Feet) 15 foot Building Setback Existing Ditch PBS 0 25 50 100' =68' PREPARED FOR: Holada Parks. Inc. STREAM!WETLAND STANDARD BUFFERS 4600 S 134th PLACE HOLADAY PARKS, TUKWILA, WA JAN 2019 41492.000 FIGURE 3 lall Department of Permitting and Critical Areas Mitigation C24 09/09/2015 Environmental Review Bond Quantity Worksheet Is-wks-sensareaBQ.xls 35030 SE Douglas Str, Suite 210 Is-wks-sensareaBQ.pdf King County' Snoqualmie, WA 98065-9266 206-296-6600 TTY Relay: 711 Project Name: Holaday Parks Buffer Restoration Date: 28-Aug-19 Prepared by: Patrick Togher, PBS Project Number: Project Description: Restore Buffer Areas Location:4625 S 134th Place, Tukwila WA Applicant: Holaday Parks Phone: PLANT MATERIALS (includes labor cost for plant installation) Type Unit Price Unit Quantity Description I Cost PLANTS: Bareroot, 18"+, medium $5.00 Each 87.00 $ 435.00 PLANTS: Container, 1 gallon, medium soil $11.50 Each 190.00 $ 2,185.00 PLANTS: Container, 2 gallon, medium soil $20.00 Each 0.00 $ - PLANTS: Container, 5 gallon, medium soil $36.00 Each 22.00 $ 792.00 PLANTS: Seeding, by hand $0.50 SY $ - PLANTS: Slips (willow, red -osier) $2.00 Each $ - PLANTS: Stakes (willow) $2.00 Each $ - PLANTS: Stakes (willow) $2.00 Each $ - PLANTS: Flats/plugs $5.00 Each 30.00 $ 150.00 'TOTAL $ 3,412.00 INSTALLATION COSTS ( LABOR, EQUIPMENT, & OVERHEAD) Type Unit Price Unit I Cost Compost, vegetable, delivered and spread $45.00 CY 120.00 I $ 5,400.00 Bark or wood chip mulch, delivered and spread $45.00 CY 60.00 $ 2,700.00 Decompacting till/hardpan, medium, to 6" depth $2.00 CY 120.00 $ 240.00 Decompacting till/hardpan, medium, to 12" depth $1.57 CY $ - Hydroseeding $0.51 SY 0.00 $ - Labor, general (landscaping other than plant installation) $40.00 HR 32.00 $ 1,280.00 Labor, general (construction) $40.00 HR 36.00 $ 1,440.00 Labor: Consultant, supervising $55.00 HR 36.00 $ 1,980.00 Labor: Consultant, on -site re -design $95.00 HR $ - Rental of decompacting machinery & operator $70.00 HR 8.00 $ 560.00 Sand, coarse builders, delivered and spread $42.00 CY $ - Staking material (set per tree) $7.00 Each $ - Surveying, line & grade $250.00 HR $ - Surveying, topographical $250.00 HR $ - Watering,1" of water, 50' soaker hose $3.62 MSF $ - Irrigation - temporary $3,000.00 Acre $ - Irrigation - buried $4,500.00 Acre 0.12 $ 540.00 Tilling topsoil, disk harrow, 20hp tractor, 4"-6" deep $1.02 SY $ - TOTAL $ 14,140.00 HABITAT STRUCTURES* ITEMS Unit Cost Unit Cost Fascines (willow) $ 2.00 Each $ - Logs, (cedar), w/ root wads, 16"-24" diam., 30' long $1,000.00 Each $ - Logs (cedar) w/o root wads,16"-24" diam., 30' $400.00 Each $ - Logs, w/o root wads, 16"-24" diam., 30' long $245.00 Each $ - Logs w/ root wads, 16"-24" diam., 30' long $460.00 Each $ - Rocks, one-man $60.00 Each $ - Rocks, two -man $120.00 Each $ - Root wads $163.00 Each $ - Spawning gravel, type A $22.00 CY $ - Weir -log $1,500.00 Each $ - Weir - adjustable $2,000.00 Each $ - Woody debris, large $163.00 Each $ - Snags - anchored $400.00 Each $ - Snags - on site $50.00 Each $ - Snags - imported $800.00 Each $ - All costs include delivery and installation [TOTAL $- EROSION CONTROL ITEMS Unit Cost Unit ] Cost Backfill and Compaction -embankment $ 4.89 CY $ - Crushed surfacing, 1 1/4" minus $30.00 CY $ - Ditching $7.03 CY $ - Excavation, bulk $4.00 CY 200.00 Grading - cut to remove gravel fill $ 800.00 Fence, silt $1.60 LF 265.00 As shown on plan $ 424.00 Jute Mesh $1.26 SY $ - Mulch, by hand, straw, 2" deep $1.27 SY $ - Mulch, by hand, wood chips, 2" deep $3.25 SY $ - Mulch, by machine, straw, 1" deep $0.32 SY $ - Piping, temporary, CPP, 6" $9.30 LF $ - Piping, temporary, CPP, 8" $14.00 LF $ - Piping, temporary, CPP, 12" $18.00 LF $ - Plastic covering, 6mm thick, sandbagged $2.00 SY $ - Rip Rap, machine placed, slopes $33.98 CY $ - Rock Constr. Entrance 100'x15'x1' $3,000.00 Each $ - Rock Constr. Entrance 50'x15'x1' $1,500.00 Each $ - Sediment pond riser assembly $1,695.11 Each $ - Sediment trap, 5' high berm $15.57 LF $ - Sediment trap, 5' high berm w/spillway ind. riprap $59.60 LF $ - Sodding, 1" deep, level ground $5.24 SY $ - Sodding,1" deep, sloped ground $6.48 SY $ - Straw bales, place and remove $600.00 TON $ - Hauling and disposal $20.00 CY $ - Topsoil, delivered and spread $35.73 CY $ - 1TOTAL $ 1,224.00 GENERAL ITEMS ITEMS Unit Cost Unit I Cost Fencing, chain link, 6' high $18.89 LF $ - Fencing, chain link, corner posts $111.17 Each $ - Fencing, chain link, gate $277.63 Each $ - Fencing, split rail, 3' high (2-rail) $10.54 LF $ - Fencing, temporary (NGPE) $1.20 LF $ - Signs, sensitive area boundary (inc. backing, post, install) $28.50 Each $ - TOTAL $ - OTHER (Construction Cost Subtotal) $ 18,776.00 ITEMS Percentage of Construction Unit Cost Mobilization 10% 1 $ 1,877.60 Contingency 30% 1 $ 5,632.80 TOTAL $ 7,510.40 NOTE: Projects with multiple permit requirements may be required to have longer MAINTENANCE AND MONITORING monitoring and maintenance terms. This will be evaluated on a case -by -case basis for development applications. Monitoring and maintance ranges may be assessed anywhere from 5 to 10 years. Maintenance, annual (by owner or consultant) Less than 1,000 sq.ft. and buffer mitigation only $ 1.08 SF (3 X SF total for 3 annual events; Includes monitoring) $ - Less than 1,000 sq.ft. with wetland or aquatic area mitigation $ 1.35 SF (3 X SF total for 3 annual events; Includes monitoring) $ - Larger than 1,000 sq. ft. but less than 5,000 sq.ft. of buffer mitigation $ 180.00 EACH (4hr @$45/hr) $ - Larger than 1,000 sq. ft. but less than 5,000 sq.ft. of wetland or aquatic area mitigation $ 270.00 EACH (6hr @$45/hr) $ - Larger than 5,000 sq.ft. but < 1 acre -buffer mitigation only $ 360.00 EACH 5.00 (8 hrs @ 45/hr) $ 1,800.00 Larger than 5,000 sq.ft. but < 1 acre with wetland or aquatic area mitigation $ 450.00 EACH (10 hrs @ $45/hr) $ - Larger than 1 acre but < 5 acres - buffer and / or wetland or aquatic area mitigation $ 1,600.00 DAY (WEC crew) $ - Larger than 5 acres - buffer and / or wetland or aquatic area mitigation $ 2,000.00 DAY (1.25 X WEC crew) $ - Monitoring, annual (by owner or consultant) Larger than 1,000 sq.ft. but less than 5,000 wetland or buffer mitigation $ 720.00 EACH (8 hrs @ 90/hr) $ - Larger than 5,000 sq.ft. but < 1 acre with wetland or aquatic area impacts $ 900.00 EACH 4.00 (10 hrs @ $90/hr) $ 3,600.00 Larger than 1 acre but < 5 acres - buffer and / or wetland or aquatic area impacts $ 1,440.00 DAY (16 hrs @ $90/hr) $ - Larger than 5 acres - buffer and / or wetland or aquatic area impacts $ 2,400.00 DAY (24 hrs @ $90/hr) $ - ITOTAL $ 5,400.00 Total $31,686.40 FILE STRUCTURAL CALCULATIONS FOR: Sheet # M1, M2 Al -A7 A8 B1 Cl, C2 C3 F1 - F4 P1, P2 Bart Collins Building 4600 S 134th Place Tukwila, WA 98168 MetalSales Job # MLIT77571148 (12' WIDE X 20' LONG BUILDING WITH 10' EAVE HEIGHT AND 2.55:12 ROOF PITCH) INDEX TO CALCULATIONS Contents Design Parameters, Loadings Clearspan Frame Analysis & Design Frame Brace End Connections Lateral Force X-Bracing Analysis and Design Purlin and Girt Analysis and Design Opening Framing Design Foundation and Concrete Anchor Design Roof & Wall Panel Information and Screw Capacities Distributor: Metal Building Outlet Corp. REVIEWED FOR CODE COMPLIANCE APPROVED OCT 06 2020 City of Tukwila BUILDING DIVISION RECEIVE; CITY OF TUKWIL. JUN 05 2019 PERMIT CENTER Structural Engineering by: Alliance Engineering of Oregon, Inc 2700 Market St NE Salem, OR 97301 engsupport@actbuildingsystems.com D 1°1- 01?2-. JOB INFORMATION: JOB NAME: Bart Collins JOB ADDRESS: 4600 S 134th Place Tukwila, WA 98168 JOB NUMBER: MLIT77571148 MATERIAL SPECIFICATIONS: Alliance Engineering of Oregon, Inc MAIN BUILDING FRAME WIDTH (ft.): 12.00 OVERALL ENCLOSED BUILDING WIDTH (ft.): 12.00 BUILDING LENGTH (ft.): 20.00 BUILDING FRAME EAVE HEIGHT (ft.): 10.00 BUILDING FRAME ROOF SLOPE (?/12): 2.55 Comer Wall Zones (ft): 6.00 Sidewall Interior Zone (ft): 8.00 CONCRETE: 2500 psi (28-day Strength) CONCRETE REINFORCING: ASTM A615, Grade 60 (Fy = 60,000 psi) STRUCTURAL BOLTS: ASTM A307 METAL ROOF PANELS: ASTM A653, Grade 80 (Fy = 80,000 psi min.) METAL WALL PANELS: ASTM A653, Grade 80 (Fy = 80,000 psi min.) CEE AND ZEE COLD -FORMED STEEL: ASTM A570, Grade 55 (Fy = 55,000 psi min.) PROJECT PARAMETERS: SITE CLASS: D RISK CATEGORY: II GOVERNING CODES: — 2015 International Building Code (Load Combinations per 2015 IBC Section 1605.3.1) AISI S100 (North American Specification for the Design of Cold -Formed Steel Structural Members) VERTICAL LOADS: DEAD LOADS: METAL ROOF PANEL: PURLINS: MISC.: STEEL FRAMES: 1.0 psf 1.0 psf 0.5 psf 1.0 psf TOTAL ROOF DEAD LOAD: WALL DEAD LOAD: ROOF LIVE LOADS: ROOF LIVE LOAD REDUCTION FACTORS (R1 x R2): DESIGN LIVE LOAD FOR CLEARSPAN FRAMES: DESIGN LIVE LOAD FOR PURLINS AND OTHER ELEMENTS: ROOF SNOW LOADS: GROUND SNOW LOAD: SNOW LOAD IMPORTANCE FACTOR, Is: Ce, Exposure Factor: Ct, Thermal Factor: Cs, Slope Factor: MIN. ROOF SNOW LOAD: DESIGN SLOPED ROOF SNOW LOAD: 3.5 psf 3.0 psf 1.00 20.0 psf 20.0 psf 36.0 psf 1.00 1.00 1.20 1.00 25.0 psf 30.2 psf MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Design Parameters -- Page M1 Alliance Engineering of Oregon, Inc LATERAL LOADS: SEISMIC LOADS: Ss: Fa: SMs = (Fa x S) _ Sps_ (2/3) x SMS = R= REDUNDANCY FACTOR, rho = SEISMIC IMPORTANCE FACTOR, le = Cs = Eh = Cs x W x rho= Eh(ASD)=Eh*.7= ADDITIONAL ROOF SNOW LOAD (psf): W =TOTAL SEISMIC DESIGN DEAD LOAD (Ibs.) = LATERAL SYSTEM SEISMIC SHEAR EFFECT, Eh (Ibs.) = SEISMIC DESIGN CATEGORY (FOR BOTH PERIODS PER SEC. 1613.5.6.1 .8xTs= Ta (sec.) = WIND LOADS: ULTIMATE WIND SPEED (mph) = 115 EXPOSURE = C BUILDING ENCLOSURE TYPE: ENCLOSED (Based on ASCE 7-10, Chapter 12, using Site Class "D" and Risk Category "II") 'Short' Period 1-sec. Period PERP.TO PERP.TO PERP.TO PERP.TO SIDEWALL ENDWALL SIDEWALL ENDWALL (TRANSVERSE) (LONGITUDINAL) 1.492 1.492 S1: 0.559 0.559 1.000 1.000 Fv: 1.500 1.500 1.492 1.492 SMi = 0.839 0.839 0.995 0.995 S01 = 0.559 0.559 3.0 3.0 3.0 3.0 1.30 1.30 1.30 1.30 1.00 1.00 1.00 1.00 0.331 0.331 0.186 0.186 0.4303 W 0.4303 W 0.2418 W 0.2418 W 0.301 W 0.301 W 0.169 W 0.169 W 6.0 6.0 6.0 6.0 3343 3343 3343 3343 1006 1006 565 565 D D 0.45 0.19 0.12 (ASCE 11.4.5) (ASCE 12.8.2.1) VELOCITY EXPOSURE COEFFICIENT, Kz = 0.850 WIND TOPOGRAPHICAL FACTOR, Kt = 1.000 WIND DIRECTIONALITY FACTOR, Kd = 0.850 MEAN ROOF HEIGHT (ft.): 10.64 ULTIMATE WIND PRESSURE (psf): 24.46 MAIN FORCE RESISTING SYSTEM (MFRS) DESIGN WIND PRESSURES (Perp. to Sidewall): ULTIMATE WIND G * Cp ± Gcpi PRESSURE (psf): Coefficient for Windward Wall Ballooning: 0.500 12.23 (pressure) Coefficient for Leeward Wall Ballooning: -0.605 -14.80 (suction) Coefficient for Windward Roof Upward Ballooning: -1.114 -27.24 (suction) Coefficient for Leeward Roof Upward Ballooning: -0.710 -17.37 (suction) Coefficient for Windward Roof Downward Ballooning: 0.000 0.00 Coefficient for Leeward Roof Downward Ballooning: -0.710 -17.37 (suction) Coefficient for Windward Wall Deflation: 0.860 21.04 (pressure) Coefficient for Leeward Wall Deflation: -0.245 -5.99 (suction) Coefficient for Windward Roof Upward Deflation: -0.754 -18.44 (suction) Coefficient for Leeward Roof Upward Deflation: -0.350 -8.57 (suction) Coefficient for Windward Roof Downward Deflation: 0.027 0.66 (pressure) Coefficient for Leeward Roof Downward Deflation: -0.350 -8.57 (suction) ALLOWABLE STRESS LATERAL SYSTEM WIND FORCE PERP. TO SIDEWALLS, W (Ibs.) = 1677 MAIN FORCE RESISTING SYSTEM (MFRS) DESIGN WIND PRESSURES (Perp. to Endwall): Int. Zone Wall Pressure Horiz. Coefficient: 1.105 Int. Zone Endwall Ultimate Wind Pressure (psf): 27.03 ALLOWABLE STRESS LATERAL SYSTEM WIND FORCE PERP. TO ENDWALLS, W (Ibs.) = 928 CLADDING AND COMPONENT ALLOWABLE STRESS DESIGN WIND PRESSURES: Element Roof Purlins: Sidewall Girts: Endwall Girts: Endwall Columns: GCp ± Gcpi FIELD) INWARD I OUTWARD Pressures (psf) INWARD I OUTWARD 0.600 1.057 1.033 1.043 -1.040 -1.157 -1.133 -1.143 8.80 15.51 15.17 15.30 15.26 16.97 16.63 16.77 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Design Parameters -- Page M2 Alliance Engineering of Oregon, Inc CLEARSPAN FRAME ANALYSIS: Analysis Software: RISA-3D version 16.05 by RISA Technologies Design Software: ACT Dimensions version 2.12.3.1 by ACT Building Systems Applicable Frame Numbers: 1-3 Overall Nominal Frame Width: 12' - 0" Nominal Eave Height: 10' - 0" Roof Pitch: 2.55:12 Tributary Width: 10' - 0" Design Roof Snow Load (psf): 30.24 Roof Live Load (psf): 20 Wind Speed and Exposure: 115 C X - JOINT LABEL (SEE RISA ANALYSIS NEXT PAGE) (X) - MEMBER LABEL (SEE RISA ANALYSIS NEXT PAGE) FRAME NODE AND MEMBER DIAGRAM MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame -- Page Al Alliance Engineering of Oregon, Inc Cold Formed Steel Properties Label Nu Therm (/1E5 F) Density [Ib/ft^3] Yield [psi] Fu[psi] 1 I CF_STL 1 2.90e+007 I 1.1154e+007 10.3 I 0.65 E [psi] G [psi] 490 55000 I 79800 Joint Coordinates Label X [ft] Y [ft] 1 C1B 0.666667 0 2 C1T 0.666667 9.460114 3 APX 6 i 10.593447 4 C2T 11.333333 9.460114 5 C2B 11.333333 0 6 KB1B 0.666667 7 7 KB1T 1.9608 9.735117 8 KB2B 11.333333 7 9 KB2T 10.0392 9.735117 10 ABA 2.8452 9.923052 11 ABB 9.1548 9.923052 Member Primary Data Label I Joint J Joint Shape Type Design List Material Design Rules 1 C1 C1B C1T 8in x 4in 14G CEE Beam CS CF_STL Typical 2 LR1 C1T APX 8in x 4in 14G CEE Beam CS CF_STL CF_STL Typical Typical 3 LR2 C2T APX 8in x 4in 14G CEE Beam CS 4 C2 C2B C2T 8in x 4in 14G CEE Beam CS CF_STL Typical 5 KB1 KB1B KB1T 4in x 2.5in 16G CEE Beam CS CF_STL Typical 6 KB2 KB2B KB2T 4in x 2.5in 16G CEE Beam CS CF_STL Typical 7 AB ABA ABB 4in x 2.5in 16G CEE Beam CS CF_STL Typical Member Advanced Data Label I Release J Release I Offset[in] J Offset[in] TIC Only Physical 1 C1 PIN 0 0 Yes 2 LR1 PIN 6.3143 0 Yes 3 LR2 PIN 6.3143 0 Yes 4 C2 PIN 0 0 Yes 5 KB1 PIN PIN 0 0 6 KB2 PIN PIN 0 0 7 AB PIN PIN 0 0 Cold Formed Steel Design Parameters Label Shape Length[ft] Lb-out[ft] Lb-in[ft] Lcomp top[ft] Lcomp bot[ft K-out K-in Cm Out sway In sway 1 C1 8in x 4in 14G CEE 9.4601 4.4601 4.4601 0.8 1 Yes 2 LR1 8in x 4in 14G CEE 5.4524 2.5149 2.5149 0.8 1 Yes 3 LR2 8in x 4in 14G CEE 5.4524 2.5149 2.5149 0.8 1 Yes 4 C2 8in x 4in 14G CEE 9.4601 4.4601 4.4601 0.8 1 Yes 5 KB1 4in x 2.5in 16G CEE 3.0258 6 KB2 4in x 2.5in 16G CEE 3.0258 7 AB 4in x 2.5in 16G CEE 6.3096 Basic Load Cases BLC Description Category Joint Point Distributed 1 Roof Dead DL 0 0 2 2 Roof Snow SL 0 ; 0 2 3 Roof Live RLL 0 0 2 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame - Page A2 Alliance Engineering of Oregon, Inc Basic Load Cases (continued) BLC Description Category Joint Point Distributed 4 Wall Dead DL 0 0 0 5 Floor Dead DL 0 w 0 0 6 Floor Live LL 0 0 0 7 Wind To Right - Upward Balooning OL1 0 0 ' 6 8 Wind To Right - Upward Deflation OL2 0 0 6 9 Wind To Right - Downward Balooning OL3 0 0 6 10 Wind To Right - Downward Deflation OL4 0 0 6 11 Wind To Left- Upward Balooning OL5 0 0 6 12 Wind To Left - Upward Deflation OL6 0 0 6 13 Wind To Left - Downward Balooning OL7 0 0 6 14 Wind To Left - Downward Deflation OL8 0 0 6 15 Earthquake EL 0 0 4 Member Distributor Loads (BLC 1 : Roof Dead) Member Label Direction Start Mag[Ib/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 LR1 Y -35 -35 0 0 2 LR2 Y -35 -35 0 0 Member Distributor Loads (BLC 2 : Roof Snow) Member Label Direction Start Mag[lb/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 LR1 Y -295.7952 -295.7952 0 0 2 LR2 Y -295.7952 -295.7952 0 0 Member Distributor Loads (BLC 3 : Roof Live) Member Label Direction Start Mag[lb/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 LR1 Y -195.6318 -195.6318 0 0 2 LR2 Y -195.6318 -195.6318 0 0 Member Distributor Loads (BLC 7 : Wind To Right - Upward Balooning) Member Label Direction Start Mag[lb/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X 122.1442 122.1442 0 9.4601 2 C2 X 147.7945 147.7945 0 9.4601 3 LR1 Y 266.112 266.112 0 0 4 LR1 X -56.5488 -56.5488 0 0 5 LR2 Y 169.6942 169.6942 0 0 6 LR2 X 36.06 36.06 0 0 Member Distributor Loads (BLC 8 : Wind To Right - Upward Deflation) Member Label Direction Start Mag[lb/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X 210.0881 210.0881 0 9.4601 2 C2 X 59.8507 59.8507 0 9.4601 3 LR1 Y 180.089 180.089 0 0 4 LR1 X -38.2689 -38.2689 0 0 5 LR2 Y 83.6711 83.6711 0 0 6 ' LR2 X 17.7801 17.7801 0 0 Member Distributor Loads (BLC 9 : Wind To Right - Downward Balooning) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X 122.1442 122.1442 0 9.4601 2 C2 X 147.7945 147.7945 0 9.4601 3 LR1 Y 0 0 0 0 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame - Page A3 Alliance Engineering of Oregon, Inc Member Distributor Loads (BLC 9 : Wind To Right - Downward Balooning) (continued) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 4 LR1 X 0 0 0 0 5 LR2 Y 169.6942 169.6942 0 0 6 LR2 X 36.06 36.06 0 0 Member Distributor Loads (BLC 10 : Wind To Right - Downward Deflation) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X 210.0881 210.0881 0 9.4601 2 C2 X 59.8507 59.8507 0 9.4601 3 LR1 Y -6.4517 -6.4517 0 0 4 LR1 X 1.371 1.371 0 0 5 LR2 Y 83.6711 83.6711 0 0 6 LR2 X 17.7801 17.7801 0 0 Member Distributor Loads (BLC 11 : Wind To Left - Upward Balooning) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X -147.7945 -147.7945 0 9.4601 2 C2 X -122.1442 -122.1442 0 9.4601 3 LR1 Y 169.6942 169.6942 0 0 4 LR1 X -36.06 -36.06 0 0 5 LR2 Y 266.112 266.112 0 0 6 LR2 X 56.5488 56.5488 0 0 Member Distributor Loads (BLC 12 : Wind To Left - Upward Deflation) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X -59.8507 -59.8507 0 9.4601 2 C2 X -210.0881 -210.0881 0 9.4601 3 LR1 Y 83.6711 83.6711 0 0 4 LR1 X -17.7801 -17.7801 0 0 5 LR2 Y 180.089 180.089 0 0 6 LR2 X 38.2689 38.2689 0 , 0 Member Distributor Loads (BLC 13 : Wind To Left - Downward Balooning) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X -147.7945 -147.7945 0 9.4601 2 C2 X -122.1442 -122.1442 0 9.4601 3 LR1 Y 169.6942 169.6942 0 0 4 LR1 X -36.06 -36.06 0 0 5 LR2 Y 0 0 0 0 6 LR2 X 0 0 0 0 Member Distributor Loads (BLC 14 : Wind To Left - Downward Deflation) Member Label Direction Start Mag[Ib/ft] End Mag[Ib/ft] Start Loc[ft,%] End Loc[ft,%) 1 C1 X -59.8507 -59.8507 0 9.4601 2 C2 X -210.0881 -210.0881 0 9.4601 3 LR1 Y 83.6711 83.6711 0 0 4 LR1 X -17.7801 -17.7801 0 0 5 LR2 Y -6.4517 -6.4517 0 0 6 LR2 X -1.371 -1.371 0 0 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame - Page A4 Alliance Engineering of Oregon, Inc Member Distributor Loads (BLC 15 : Earthquake) Member Label Direction Start Mag[Ib/ft] End Mag[lb/ft] Start Loc[ft,%] End Loc[ft,%] 1 C1 X 9.999 9.999 0 0 2 LR1 X 31.8235 31.8235 0 0 3 LR2 X 31.8235 31.8235 0 0 4 C2 X 9.999 9.999 0 , 0 Load Combinations Description PDelta SRSS BLC Factor BLC Factor BLC Factor BLC Factor 1 DL ONLY _ DL 1 2 FLL ONLY LL 1 3 IBC 16-9 DL 1 LL 1 4 IBC 16-10 (a) DL 1 RLL 1 5 IBC 16-10 (b) DL 1 SL 1 6 IBC 16-11 (a) DL 1 LL 0.75 RLL 0.75 7 IBC 16-11 (b) DL 1 LL 0.75 SL 0.75 8 IBC 16-12 (a) 1 DL 1 OL1 0.6 9 IBC 16-12 (a) 2 DL 1 OL2 0.6 10 IBC 16-12 (a) 3 DL 1 OL3 0.6 11 IBC 16-12 (a) 4 DL 1 OL4 0.6 12 IBC 16-12 (a) 5 DL 1 OL5 0.6 13 IBC 16-12 (a) 6 DL 1 OL6 0.6 14 IBC 16-12 (a) 7 DL 1 OL7 0.6 15 IBC 16-12 (a) 8 DL 1 OL8 0.6 16 IBC 16-12 (b) 1 DL 1 EL 0.7 17 IBC 16-12 (b) 2 DL 1 EL -0.7 18 IBC 16-13 (a) 1 DL 1 LL 0.75 OL1 0.45 RLL 0.75 19 IBC 16-13 (a) 2 DL 1 LL 0.75 OL2 0.45 RLL 0.75 20 IBC 16-13 (a) 3 DL 1 LL 0.75 OL3 0.45 RLL 0.75 21 IBC 16-13 (a) 4 DL 1 LL 0.75 OL4 0.45 RLL 0.75 22 IBC 16-13 (a) 5 DL 1 LL 0.75 OL5 0.45 ' RLL 0.75 23 IBC 16-13 (a) 6 DL 1 LL 0.75 OL6 0.45 RLL 0.75 24 IBC 16-13 (a) 7 DL 1 LL 0.75 OL7 0.45 RLL 0.75 25 IBC 16-13 (a) 8 DL 1 LL 0.75 OL8 0.45 RLL 0.75 26 IBC 16-13 (b) 1 DL 1 LL 0.75 OL1 0.45 SL 0.75 27 IBC 16-13 (b) 2 DL 1 LL 0.75 OL2 0.45 SL 0.75 28 IBC 16-13 (b) 3 DL 1 LL 0.75 OL3 0.45 SL 0.75 29 IBC 16-13 (b) 4 DL 1 LL 0.75 OL4 0.45 SL 0.75 30 IBC 16-13 (b) 5 DL 1 LL 0.75 OL5 0.45 ' SL 0.75 31 IBC 16-13 (b) 6 DL 1 LL 0.75 OL6 0.45 SL 0.75 32 IBC 16-13 (b) 7 DL 1 LL 0.75 OL7 0.45 SL 0.75 33 IBC 16-13 (b) 8 DL 1 LL 0.75 OL8 0.45 SL 0.75 34 IBC 16-14 (a) 1 DL 1 LL 0.75 EL 0.525 SL 0.75 35 IBC 16-14 (a) 2 DL 1 LL 0.75 EL -0.525 SL 0.75 36 IBC 16-15 (a) 1 DL 0.6 OL1 0.6 37 IBC 16-15 (a) 2 DL 0.6 OL2 0.6 38 IBC 16-15 (a) 3 DL 0.6 OL3 0.6 39 IBC 16-15 (a) 4 DL 0.6 OL4 0.6 40 IBC 16-15 (a) 5 DL 0.6 OL5 0.6 41 IBC 16-15 (a) 6 DL 0.6 OL6 0.6 42 IBC 16-15 (a) 7 DL 0.6 OL7 0.6 43 IBC 16-15 (a) 8 DL 0.6 OL8 0.6 44 IBC 16-16 (a)1 DL 0.6 EL 0.7 45 IBC 16-16 (a) 2 DL 0.6 EL -0.7 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame - Page A5 Alliance Engineering of Oregon, Inc Envelope Joint Reactions Joint X [lb] LC Y [lb] LC Moment [Ib-ft] LC 1 C1B max 842.454 14 1684.272 33 0 1 2 min -995.646 39 -1227.186 36 0 1 3 C2B max 995.646 43 1684.272 29 0 1 4 min -842.454 10 -1227.186 40 0 1 5 Totals: max 1638.775 14 3259.145 5 6 min -1638.775 10 -1081.227 36 Envelo • e Member Section Forces Member Sec Axial[lb] LC Shear[lb] LC Moment lb-ft] LC 1 C1 1 max 1684.272 33 995.646 39 0 1 2 min -1227.186 36 -842.454 14 0 1 3 2 max 2923.195 38 1695.17 32 0 1 4 min -2849.33 14 -1732.712 39 0 1 5 LR1 1 max 2227.529 39 2515.31 38 1289.029 14 6 min -2179.879 14 -2449.728 14 -1323.539 38 7 2 max 3464.21 5 956.205 42 0 1 8 min -1255.966 36 -1165.817 28 0 1 9 LR2 1 max 2227.529 43 2515.31 42 1289.029 10 10 min -2179.879 10 -2449.728 10 -1323.539 42 11 2 max 3464.21 5 956.205 38 0 1 12 min -1255.966 40 -1165.817 32 0 1 13 C2 1 max 1684.272 29 842.454 10 0 1 14 min -1227.186 40 -995.646 43 0 1 15 2 max 2923.195 42 1732.712 43 0 1 16 min -2849.33 10 -1695.17 28 0 1 17 KB1 1 max 4433.096 33 0 1 0 1 18 min -4134.66 38 0 1 0 1 19 2 max 4433.096 33 0 1 0 1 20 min -4134.66 38 0 1 0 1 21 KB2 1 max 4433.096 29 0 1 0 1 22 min -4134.66 42 0 1 0 1 23 2 max 4433.096 29 0 1 0 1 24 min -4134.66 42 0 1 0 1 25 AB 1 max 1099.84 37 0 1 0 1 26 min -3300.642 5 0 1 0 1 27 2 max 1099.84 37 0 1 0 1 28 min -3300.642 5 0 1 0 1 A/S/ S100-16: ASD Cold Formed Steel Code Checks (By ACT Dimensions) Member Shape Code Check Loc[ft] LC Shear Check Loc[ft] LC 1 C1 8in x 4in 14G CEE 0.8782 6.971 32 0.6396 7.469 32 2 LR1 8in x 4in 14G CEE 0.8016 0.8609 38 0.8016 0.8609 38 3 LR2 8in x 4in 14G CEE 0.8016 0.8609 42 0.8016 0.8609 42 4 C2 8in x 4in 14G CEE 0.8782 6.971 28 0.6396 7.469 28 5 KB1 4in x 2.5in 16G CEE 0.4069 0 29 0 0 1 6 KB2 4in x 2.5in 16G CEE 0.4069 0 29 0 0 " 1 7 AB 4in x 2.5in 16G CEE 0.1887 0 37 0 0 1 ML1T77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame -- Page A6 Alliance Engineering of Oregon, Inc AISI S100-16: ASD Cold Formed Steel Allowable Member Loads (By ACT Dimensions) Member Shape Pn/Om[Ib] Tn/Om[Ib] Mn/Om[Ib] Cb Cm Equation 1 C1 8in x 4in 14G CEE 10625 36229 5426 1 1 H1.2-1 2 LR1 8in x 4in 14G CEE 15249 36229 5426 1 1 H2-1 3 LR2 8in x 4in 14G CEE 15249 36229 5426 1 1 H2-1 4 C2 - 8in x 4in 14G CEE 10625 36229 5426 1 1 HI2-1 5 KB1 4in x 2.5in 16G CEE 10894 17915 1801 1 1 H1.2-1 6 KB2 4in x 2.5in 16G CEE 10894 17915 1801 1 1 H1.2-1 7 AB 4in x 2.5in 16G CEE 5829 17915 1656 1 1 H1.2-1 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Clearspan frame — Page A7 Alliance Engineering of Oregon, Inc FRAME BRACE END SCREW CONNECTION DESIGN Brace results apply at Frames 1-3 Knee Brace Vert. Knee Brace Horiz. Apex Brace Horiz. Gable Frame Columns: Gable Frame Rafters: Gable Frame Typ. Knee Braces: Gable Frame Apex Braces: Intersection Dimension per Detail A/2 (ft.): Intersection Dimension per Detail A/2 (ft.): Intersection Dimension per Detail B/2 (ft.): Single 8in x 4in 14G CEE Single 8in x 4in 14G CEE Single 4in x 2.5in 16G CEE Single 4in x 2.5in 16G CEE 7'-33/4" 0' - 11 3/4" 2' - 4" Screw Size: #14 Ultimate Single Shear Screw Strength (Ibs.): 2450 O = 2.5 R3d (group effect n Screws factor) V single screw (Ibs.) P (design allowable, lbs.) Knee Brace Apex Brace NOTATIONS 8 0.70 572 4576 6 0.73 593 3557 * MAX. KNEE BRACE FORCE (Ibs.): 4433 (INSTALL (8) #14 SCREWS AT EACH END OF EACH KNEE BRACE) * MAX. APEX BRACE FORCE (Ibs.): 3301 (INSTALL (6) #14 SCREWS AT EACH END OF EACH APEX BRACE) FRAME BRACE END ALTERNATE BOLT CONNECTION DESIGN Fu = Tensile strength of connected part (psi) Fy = Yield strength of connected part (psi) db = Nominal bolt diameter (in.) g1 = Nominal gauge of thinnest connected part (in.) t1 = Thickness of thinnest connected part (in.) Pn = Nominal bearing strength per bolt (Ibs.) ALLOWABLE SHEAR BASED ON CONNECTED MATERIALS: Fu (psi) = 70000 Fy (psi) = 55000 d/t = 10.59 C = 2.94 Pn = 7591 Allowable shear based on connected material bearing (Ibs.): 3100 Bolt Grade: A307 Allowable shear based on A307 bolt in shear (Ibs.): 3068 db = 0.625 g1 = 16 t1 = 0.059 Allowable Shear on Each Bolt (Ibs.): 3068 MAX. KNEE BRACE FORCE (Ibs.): 4433 (USE MIN. (2) 5/8" DIAM. A307 BOLTS AT EACH END OF EACH KNEE BRACE) MAX. APEX BRACE FORCE (Ibs.): 3301 (USE MIN. (2) 5/8" DIAM. A307 BOLTS AT EACH END OF EACH APEX BRACE) MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Brace End Conn's. — Page A8 Alliance Engineering of Oregon, Inc LATERAL FORCE X-BRACING ANALYSIS: (WIND CAPABLE MEANS THAT STEEL FRAMES ARE DESIGNED TO CARRY HORIZ. WIND AND SEISMIC WIND CAPABLE FRAMES USED (Y/N): Y LOADS THAT ARE TRIBUTARY TO THEM) MAX. X-BRACING BAY WIDTH: 9.83 ft. MAIN BUILDING LEANTO 'A' LEANTO 'B' ENDWALL"A" X-BRACING TOTAL SHEAR FORCE, LBS.: 471 BRACING BAY # X-BRACING WIDTH (ft.): HEIGHT (ft.): SHEAR FORCE (Ibs.): BASE UPLIFT TENSION (Ibs.): X-BRACING TENSION (lbs.): MIN. STRAP SIZE: (ADD KNEE AND APEX BRACES TO ENDWALL FRAME IN LIEU OF X- ENDWALL"B" X-BRACING TOTAL SHEAR FORCE, LBS.: 471 BRACING BAY # X-BRACING WIDTH (ft.): HEIGHT (ft.): SHEAR FORCE (Ibs.): BASE UPLIFT TENSION (Ibs.): X-BRACING TENSION (Ibs.): MIN. STRAP SIZE: (ADD KNEE AND APEX BRACES TO ENDWALL FRAME IN LIEU OF X- SIDEWALL'A' X-BRACING TOTAL SHEAR FORCE, LBS.: 503 BAY #: 2 X-BRACING WIDTH (ft.): 9.83 HEIGHT (ft.): 9.67 SHEAR FORCE (Ibs.): 503 BASE UPLIFT TENSION (Ibs.): 495 X-BRACING TENSION (lbs.): 706 STRAP SIZE: Single 1.5in 16G Strap SIDEWALL'B' X-BRACING TOTAL SHEAR FORCE, LBS.: 503 BAY #: 2 X-BRACING WIDTH (ft.): 9.83 HEIGHT (ft.): 9.67 SHEAR FORCE (Ibs.): 503 BASE UPLIFT TENSION (Ibs.): 495 X-BRACING TENSION (Ibs.): 706 STRAP SIZE: Single 1.5in 16G Strap MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Lateral Force X-Bracing — Page B1 Alliance Engineering of Oregon, Inc ROOF PURLIN DESIGN I4in x 2.125/2.375in 16G ZEE 2.51 50 I OK m 0.23 = (U497) I4in x 2.5in 16G Eave Strut OK CO m oo rn m o o SAY811V N CC; CN cc'I O CO I b N CO ] Oi II MEMBER SIZE USED --> z< F a a d 0 0 w w F H (o J co J F O Z 0 I- w W w W w w O j j 0 0 0 O ot'oi-zzza cc re < o < 0 Z 0 Z z < D < CO z ft10 O 00Z D W o 0 Z 0 0 0 Z W c� o w 0 A N ^ , a U 0 0 0 Tti To C U §+ § w d zZ E 0 w DOWNWARD DEFLECTION (in.): UPWARD DEFLECTION (in.) U a) rn d Roof Purlins -- MLIT77571148 Collins Calc Package.xlsm Alliance Engineering of Oregon, Inc WALL GIRT DESIGN SIDEWALL'A' AND'B' GIRT DESIGN 4in x 2.125/2.375in 16G ZEE 76 85 1732 450 0.37 = (L/318) #m, 2§§ (\ 2) k§o // \ § � oE\ff 00 OZ <aG## Lij ZO gg om §j \ INWARD DEFLECTION (i OUTWARD DEFLECTION (i ENDWALL'B' GIRT DESIGN 4in x 2.125/2.375in 16G ZEE r ;2§:; e� ° 1825 457 (k �@ aw k§6 0.43 = (L/274) ® %}ii ENDWALL'A' GIRT DESIGN 4in x 2.125/2.375in 16G ZEE I Y $$00 §2$ 1825 457 (§ 7§ k§ OK // 0.47 = (L/250) MEMBER SIZE USED --> INWARD DEFLECTION (in.): OUTWARD DEFLECTION (i 0 / 0- Wall Girts -- _ \ / MLIT77571148 Collins Calc Package.xlsm Alliance Engineering of Oregon, Inc OPENING FRAMING DESIGN # ONIN3d0 - N Y 0 (71) ONIOVH9 eN ('sg1-i0111I0 M30V3H 210d 1N31NOW 318VMO11V uFi N (3lanoa 2IO 31ONIS) 21391N31N 12110 2130V3H m 21381#31# 12110 213OV3H 4in x 2.125/2.375in 16G ZEE ('sg1-1)1N3WOIN 1910 2130V3H (71) H1ON311910 2130V3H 1 m 0 0 00 ('sg1-71) 2139W3W 9WVf 210d 1N31#O111 318VM011V m ,o N N 2139W3W 9WVf 4in x 2.5in 16G CEE 4in x 2.5in 18G CEE ('sgl•14)1N3WOW 91NVr . m 2 o (71)1H0I3H 9WVf NOIS30 rn (11)1HOI3H ONIN3d0 m ('11) H1OIM ONIN3d0 o W mm 'TO ONIN3d0 01 AV9 AO 3003 WO21d '1SIO 'XYW 0 , 0 ('u) H101M AV9 o m o rn : jsd) 3110SS3dd ONIM NOIS3O mo m #AV9 •-‘- N011V30111VM Endwall A Sidewall A # ONIN3d0 - N Opening Framing -- co O ti LO MLIT77571148 Collins Calc Package.xlsm Alliance Engineering of Oregon, Inc FOUNDATION DESIGN CONCRETE STRENGTH (fc): 2500 psi REINF. YIELD STRENGTH: 60000 psi ALLOW. SOIL PRESSURE: 1500 psf NOTE: FOOTING SHALL EXTEND BELOW LOCAL FROST DEPTH. CONSULT LOCAL BUILDING DEPARTMENT FOR REQUIREMENTS. SIDEWALL CONTINUOUS FOOTING CONCRETE SLAB THICKNESS DEPTH OF FTG. BELOW GRADE DESIGN SOIL PRESSURE FOOTING WIDTH FOOTING DEPTH DOWNWARD LOAD AT C.S. FRAME FOOTING AREA REQUIRED NET UPLIFT LOAD AT C.S. FRAME NET UPLIFT FROM SIDEWALL X-BRACE DESIGN d top DESIGN d bottom LENGTH FTG. REQ'D. (DL+SN) LENGTH FTG. REQ'D (UPLIFT) Mu DESIGN MOMENT (ft.-lbs.): AREA OF REINF. REQUIRED: AREA OF REINF. PROVIDED: a= 4 in. (MIN.) 24 in. (MIN.) 1500 psf 12 IN. (MIN.) 24 IN. (MIN.) 1895 lbs. 1.3 ft.^2 1231 lbs.* 405 lbs. 22.0 in. 20.5 in. 1.3 ft. 2.5 ft. TOP BOTTOM 530 509 0.01 0.01 0.01 0.01 0.20 0.20 OK OK (ACTUAL MOMENT AT ANCHOR BOLT LOCATION = 378 FT.-LBS., f(t) top = 3 psi AND f(r) = 375 psi, THEREFORE DESIGN ANCHOR BOLTS IN UNCRACKED CONCRETE (SEE CALC PG. F3) (FROM A.C.I. FLEXURE TABLES) OK USE---412" WIDE BY 24" DEEP FOOTING WI (1)44 TOP AND (1)44 BTM. (NO SHEAR REINF. REQ'D) MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Sidewall Slab Edge Fdn. -- Page F1 Alliance Engineering of Oregon, Inc FOUNDATION DESIGN CONCRETE STRENGTH (fc): 2500 psi REINF. YIELD STRENGTH: 60000 psi ALLOW. SOIL PRESSURE: 1500 psf NOTE: FOOTING SHALL EXTEND BELOW LOCAL FROST DEPTH. CONSULT LOCAL BUILDING DEPARTMENT FOR REQUIREMENTS. ENDWALL CONTINUOUS FOOTING CONCRETE SLAB THICKNESS DEPTH OF FTG. BELOW GRADE DESIGN SOIL PRESSURE FOOTING WIDTH FOOTING DEPTH DOWNWARD LOAD AT ENDWALL COLUMN FOOTING AREA REQUIRED NET UPLIFT LOAD FROM ENDWALL COLUMN NET UPLIFT FROM ENDWALL X-BRACE DESIGN d top DESIGN d bottom LENGTH FTG. REQ'D. (DL+SN) LENGTH FTG. REQ'D (UPLIFT) Mu DESIGN MOMENT (ft.-lbs.): AREA OF STEEL REQ. AREA OF STL. PROVIDED a= USE ---> (NO SHEAR REINF. REQ'D) 4 in. (MIN.) 24 in. (MIN.) 1500 psf 12 IN. (MIN.) 24 IN. (MIN.) 0 lbs. 0.0 ft.^2 0 lbs. 0 lbs. 22.0 in. 20.5 in. 0.0 ft. 0.0 ft. TOP BOTTOM 0 0 0.00 0.00 0.00 0.00 0.20 0.20 OK OK (ACTUAL MOMENT AT ANCHOR BOLT LOCATION = 0 FT: LBS., f(t) top = 0 psi AND f(r) = 375 psi, THEREFORE DESIGN ANCHOR BOLTS IN UNCRACKED CONCRETE (SEE CALC PG. F4) (FROM A.C.I. FLEXURE TABLES) OK 12" WIDE BY 24" DEEP FOOTING W/ 1)-#4 TOP AND (1)-#4 BTM. MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Endwall Slab Edge Fdn. — Page F2 Alliance Engineering of Oregon, Inc CONCRETE ANCHOR DESIGN PER ACI 318-14, APPENDIX "D" ANCHOR LOCATION: CORNER COLUMN AT X-BRACING COLUMNS DESIGN LOADS AT ALLOWABLE STRESS LEVELS : D.L. SHEAR FORCE (LBS.) D.L. TENSION FORCE (LBS.): F.L.L. SHEAR FORCE (LBS.): F.L.L. TENSION FORCE (LBS.): SL (RLL) SHEAR FORCE (LBS.): SL (RLL) TENSION FORCE (LBS.): WIND SHEAR FORCE (LBS.): WIND TENSION FORCE (LBS.): SEISMIC SHEAR FORCE (LBS.): SEISMIC TENSION FORCE (LBS.): A.C.I. SECTION 9.2 LOAD COMBINATIONS: ULT. SHEAR FORCE (LBS.), Vu: ULT. TENSION FORCE (LBS.), Tu: ANCHOR TYPE (diem. x length): ANCHOR DIAM. (IN.): ANCHOR LENGTH (IN.): NUMBER OF ANCHORS: SPECIAL INSPECTION REQUIRED? X' ANCHOR SPACING: EFFECTIVE EMBEDMENT: LOAD EDGE DISTANCE, c1: PERP. EDGE DISTANCE, c2: DEPTH OF CONCRETE EDGE (IN.): CRACKED CONCRETE CONDITION (Y/N)? e eccentricity (IN.) = psi [ec,N] ((Eqn. D-9)) = psi [ed,N] ((Eqn. D-10, D-11)) = psi [c,N] ((Sec. D.5.2.6)) = psi [cp,N] (Eqn.D-12, D-13) = psi [c,P] (Sec. D.5.3.6) = V eccentricity (IN.) = psi [ec,V] (Eqn. D-26) = psi [ed,V] (Eqn. D-27, D-28) = psi [c,V] (Sec. D.6.2.7) = ANo (IN ^2) = AN (IN.^2) = Nb (LBS.) = Ncbg (LBS.) = Ns (LBS.)= Npn (LBS.) = SEISMIC TENSION DUCTILITY FACTOR: ONn (LBS.) = Avc (IN ^2) = Avco (IN.^2) = Vb (LBS.) = Vcbg (LBS.) = Vs (LBS.) = SEISMIC SHEAR DUCTILITY FACTOR: mVn (LBS.) = MAX. UNITY VALUE (EQNS. D.7.1, D.7.2, D.7.3): 0 0 0 0 0 0 464 456 503 495 CONCRETE ANCHOR MANUFACTURER AND TYPE: DEWALT'SCREW-BOLT+' ANCHOR (VALUES FROM ESR-3889 REPORT, EFF. THRU 11/2019) STEEL ANCHOR TENSILE STRENGTH: 115000 PSI NORMAL WT. CONCRETE STRENGTH: 2500 PSI ANCHOR TENSION REINFORCING PROVIDED? N ANCHOR SHEAR REINFORCING PROVIDED? N (EQ. 9-2) (EQ. 9-3) (EQ. 9-4) (EQ. 9-5) (EQ. 9-6) (EQ. 9-7) 0 371 742 719 742 719 0 365 730 707 730 707 .5X3.0 0.500 0.500 0.500 0.500 0.500 0.500 3.00 3.00 3.00 3.00 3.00 3.00 2 2 2 2 2 2 N N N N N N 4.00 4.00 4.00 4.00 4.00 4.00 2.17 2.17 2.17 2.17 2.17 2.17 5.38 5.38 5.38 5.38 5.38 5.38 6.00 6.00 6.00 6.00 6.00 6.00 24.0 24.0 24.00 24.00 24.00 24.00 N N N N N N 0.00 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.40 1.40 1.40 1.40 1.40 1.40 0.91 0.91 0.91 0.91 0.91 0.91 1.40 1.40 1.40 1.40 1.40 1.40 0.00 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 1.00 1.00 1.00 0.88 0.88 0.88 0.88 0.88 0.88 1.40 1.40 1.40 1.40 1.40 1.40 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 3836 3836 3836 3836 3836 3836 4892 4892 4892 4892 4892 4892 40950 40950 40950 40950 40950 40950 0 0 0 0 0 0 1.00 1.00 1.00 0.40 1.00 0.40 4892 4892 4892 1957 4892 1957 0.00% 7.46% 14.91% 36.11% 14.91% 36.11% 165.4 165.4 165.4 165.4 165.4 165.4 162.0 162.0 162.0 162.0 162.0 162.0 4878 4878 4878 4878 4878 4878 12259 12259 12259 12259 12259 12259 17720 17720 17720 17720 17720 17720 1.00 1.00 1.00 0.40 1.00 0.40 12259 12259 12259 4904 12259 4904 0.00% 3.03% 6.05% 14.66% 6.05% 14.66% 0.00 0.07 0.15 0.36 0.15 0.36 MAX. UNITY: 0.36 USE -->1(2) - 1/2" DIAM. X 3" LONG DEWALT 'SCREW -BOLT+' ANCHOR ANCHORS IN 3.5 IN. DEEP HOLES (SIDEWALL ANCHOR DESIGN GOVERNS AT THIS LOCATION) MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Corner -Side X-B Anchors -- Page F3 Alliance Engineering of Oregon, Inc CONCRETE ANCHOR DESIGN PER ACI 318-14, APPENDIX "D" ANCHOR LOCATION: ENDWALL OPENING JAMBS DESIGN LOADS AT ALLOWABLE STRESS LEVELS : D.L. SHEAR FORCE (LBS.), POSITIVE SHEAR LOADS ARE TOWARD EDGE OF SLAB: 0 D.L. TENSION FORCE (LBS.): 0 F.L.L. SHEAR FORCE (LBS.): 0 F.L.L. TENSION FORCE (LBS.): 0 SL (RLL) SHEAR FORCE (LBS.): 0 SL (RLL) TENSION FORCE (LBS.): 0 WIND SHEAR FORCE (LBS.): 425 WIND TENSION FORCE (LBS.): 0 SEISMIC SHEAR FORCE (LBS.): 23 SEISMIC TENSION FORCE (LBS.): 0 A.C.I. SECTION 9.2 LOAD COMBINATIONS: ULT. SHEAR FORCE (LBS.), Vu: ULT. TENSION FORCE (LBS.), Tu: ANCHOR TYPE (diem. x length): ANCHOR DIAM. (IN.): ANCHOR LENGTH (IN.): NUMBER OF ANCHORS: SPECIAL INSPECTION REQUIRED? EFFECTIVE EMBEDMENT: LOAD EDGE DISTANCE, ct: PERP. EDGE DISTANCE, c2: DEPTH OF CONCRETE EDGE: CRACKED CONCRETE CONDITION (Y/N)? e eccentricity (IN.) = psi [ec,N] ((Eqn. D-8)) = psi [ed,N] ((Eqn. D-9, D-10)) = psi [c,N] ((Sec. D.5.2.6)) = psi [cp,N] (Eqn.D-11, D-12) = psi [c,P] (Sec. D.5.3.6) = V eccentricity (IN.) = psi [ec,V] (Eqn. D-36) = psi [ed,V] (Eqn. D-37, D-38) = psi [c,V] (Sec. D.6.2.7) = ANo (IN.^2) = AN (IN.A2) = Nb (LBS.) = Ncbg (LBS.) = Ns (LBS.) = Npn (LBS.) = SEISMIC TENSION DUCTILITY FACTOR: mNn (LBS.) = Avc (IN.^2) = Avco (IN.^2) = Vb (LBS.) = Vcbg (LBS.)= Vs (LBS.) = SEISMIC SHEAR DUCTILITY FACTOR: OVn (LBS.) = MAX. UNITY VALUE (EQNS. D.7.1, D.7.2, D.7.3): MAX. UNITY: USE --> CONCRETE ANCHOR MANUFACTURER AND TYPE: DEWALT 'SCREW -BOLT+' ANCHOR (VALUES FROM ESR-3889 REPORT, EFF. THRU 11/2019) STEEL ANCHOR TENSILE STRENGTH: 115000 PSI NORMAL WT. CONCRETE STRENGTH: ANCHOR TENSION REINFORCING PROVIDED? ANCHOR SHEAR REINFORCING PROVIDED? 2500 PSI N N (EQ. 9-2) (EQ. 9-3) (EQ. 9-4) (EQ. 9-5) (EQ. 9-6) (EQ. 9-7) 0 340 680 23 680 23 0 0 0 0 0 0 .5X3.0 0.500 0.500 0.500 0.500 0.500 0.500 3.00 3.00 3.00 3.00 3.00 3.00 1 1 1 1 1 1 N N N N N N 2.17 2.17 2.17 2.17 2.17 2.17 2.00 2.00 2.00 2.00 2.00 2.00 48.00 48.00 48.00 48.00 48.00 48.00 24.0 24.0 24.00 24.00 24.00 24.00 N N N N N N 0.00 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 1.00 1.00 1.00 0.88 0.88 0.88 0.88 0.88 0.88 1.40 1.40 1.40 1.40 1.40 1.40 0.55 0.55 0.55 0.55 0.55 0.55 1.00 1.00 1.00 1.00 1.00 1.00 0.00 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.40 1.40 1.40 1.40 1.40 1.40 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 42.4 3836 3836 3836 3836 3836 3836 2620 2620 2620 2620 2620 2620 20475 20475 20475 20475 20475 20475 0 0 0 0 0 0 1.00 1.00 1.00 1.00 1.00 1.00 2620 2620 2620 2620 2620 2620 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 18.0 18.0 18.0 18.0 18.0 18.0 18.0 18.0 18.0 18.0 18.0 18.0 939 939 939 939 939 939 1314 1314 1314 1314 1314 1314 8860 8860 8860 8860 8860 8860 1.00 1.00 1.00 1.00 1.00 1.00 1314 1314 1314 1314 1314 1314 0.00% 25.87% 51.75% 1.76% 51.75% 1.76% 0.00 0.26 0.52 0.02 0.52 0.02 0.52 ((1) - 1/2" DIAM.X 3" LONG DEWALT 'SCREW -BOLT+' ANCHOR ANCHORS IN 3.5 IN. DEEP HOLES (OPENING JAMB ANCHOR DESIGN GOVERNS AT THIS LOCATION) MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Endwall Jamb Anchors -- Page F3 Alliance Engineering of Oregon, Inc PBR-PANEL 12" 36" Coverage Condensed Technical Reference 11 /4., _ 31 .. l 15/s" 35/16" SECTION PROPERTIES ALLOWABLE UNIFORM For various fastener inward Load LIVE LOADS, psf spacings Outward Load 6a Width in Yield ksi Weight psf Top in Compression Bottom in Compression Ixx in`/ft Sxx in'tft Ixx in'tft Sxx in'/ft 2' 3' 4' 5' 6' 7' 2' 3' 4' 5' 6' 7' 26 24 22 36 36 36 80 50 50 0.84 1.09 1.43 0.0367 0.0560 0.0800 0.0367 0.0579 0.0860 0.0317 0.0457 0.0633 0.0458 0.0613 0.0816 261 330 453 129 153 207 76 88 118 49 57 76 35 39 53 23 29 39 223 314 474 107 145 217 62 83 124 40 53 80 28 37 55 21 27 41 1. Theoretical sect on properties have been calculated per AISI 2012 'North American Specification for the Design of Cold -Formed Steel Structural Members'. Ixx and Sxx are effective section properties for deflection and bending. 2. Allowable load is calculated in accordance with AISI 2012 specifications considering bending. shear. combined bending and shear and deflection. Allowable load considers the 3 or more equal spans condition. Allowable load does not address web crippling, Fasteners, support material or load testing. Panel weight is not considered. 3. Deflection consideration is limited by a maximum deflection ratio of L/180 of span. 4. Allowable loads do not include a 1/3 stress increase for wind. TESTING AND APPROVALS ► UL 2218 Impact Resistance - Class 4 ► UL 790 Fire Resistance Rating - Class A. per building code ► UL 263 Fire Resistance Rating - per assembly ► ASTM E 1592 Structural Performance ► UL 580 Uplift Resistance - Class 90 Construction: #161 ► Texas Windstorm - Evaluations RC-I98, RC-265 and RC-279 ► 2017 FBC Approvals - FL9482.4, FL10999.7 and FL14645.13 ► Miami -Dade County, Florida NOA 15-0318.01 - Wall expires 4/22/2020 ► Miami -Dade County, Florida NOA 15-0318.02 - Roof expires 6/2/2020 ► ICC Evaluation Report - ESR-2385 I metal sales 1 manufacturing corporation ©MS 1280PBR/2.2018 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Roof & Wall Sheeting -- Page F3 NOTATIONS Alliance Engineering of Oregon, Inc SCREW CONNECTION DESIGN ds = Nominal screw diameter (in.) S2 Omega = 3.0 Pns = Nominal shear stength per screw (Ibs.) Pnt = Nominal tension strength per screw (Ibs.) Pnot = Nominal pull-out strength per screw (Ibs.) Pnov = Nominal pull -over strength per screw (Ibs.) g1 = nominal gauge of member in contact with the screw head (in.) t1 = Thickness of member in contact with the screw head (in.) g2 = nominal gauge of member NOT in contact with the screw head (in.) t2 = Thickness of member NOT in contact with the screw head (in.) Fu1 = Tensile strength of member in contact with the screw head (Ibs.) Fu2 = Tensile strength of member NOT in contact with the screw head (Ibs.) ROOF PANEL (PBR-Panel 26G) g1 = g2 = t1 = t2 = Fu1 = Fu2 = Screw # = ds (in.) = 26 16 0.0179 0.057 80000 67000 12 0.216 ALLOWABLE SHEAR BASED ON CONNECTED MATERIALS: t2/t1 = 3.18 Pns (eq. E4.3.1-4) = Allowable Shear per Screw (0 Omega = 3.0): ALLOWABLE SHEAR BASED ON SCREW: Allowable Shear per Screw = Design Shear per Screw = WALL PANEL g1 = g2 = t1 = t2 = Fu1 = Fu2 = Screw # = ds (in.) = t2/t1 = 835 Pns (eq. E4.3.1-4) = 278 Allowable Shear per Screw = 625 Allowable Shear per Screw = 278 Design Shear per Screw = ALLOWABLE TENSION BASED ON CONNECTED MATERIALS: Pullout Strength, Pnot (eq. E4.4.1.1) = 701 Pullover Strength, Pnov (eq. E4.4.2.1) = 537 Allowable Tension per Screw (Ibs.) = 179 Nominal Screw Tension Strength (Ibs) = 860 (PBR-Panel 26G) 26 16 0.0179 0.057 80000 67000 12 0.216 3.18 835 278 625 278 701 537 179 860 MLIT77571148 Collins Calc Package.xlsm 5/17/2019 Screw Capacities -- Page F3 PUBLIC WORKS BULLETIN Al PERMITS AND FEES CITY OF TUKWILA Public Works Department 206-433-0179 This Bulletin summarizes permits Public Works (PW) issues for onsite development and for activities in the right-of-way. Public Works permits can be issued as part of a building permit or as a Miscellaneous permit. Most Public Works permit fees are flat rates, except for Type C permit fees, which are based on the value of the construction work. For Type C permits, PW collects a base application and plan review fee when the application is submitted and a Permit Issuance and Inspection fee when the permit is issued. Flat rate permit fees are due when the permit is issued. After the permit is issued, PW may assess additional fees for Revisions and inspections. These additional fees must be paid before the PW Final Inspection occurs. Refer to Bulletins A2, A4, A6, and A7, for more information. PERMIT DESCRIPTION Short-term Nonprofit Type A Issued for 72 hours to nonprofit organizations for assemblies, bike races, block parties, parades, parking, processions, nonmotorized vehicle races, street dances, street runs. Flat Rate $50 plus 5% technology fee. Short-term Profit Type B Issued for 72 hours to for -profit entities for fairs, house moves, sales, street closure. Flat Rate $100 plus 5% technology fee. Construction Type C Issued for 180 days for activities in the right-of-way and on private property. These activities include sewer, water, storm drainage, grading, street improvements, boring, culverts, curb cuts, paving, driveways, fences, landscaping, painting/striping, sidewalks, trenching, utility installation/repair. Calculated fee based on construction value plus technology fee. Refer to Bulletin A2 to estimate permit fees. Long-term Type D 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. Flat Rate $100 plus 5% technology fee. Potential Disturbance Type E 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 or hauling hazardous waste. Flat Rate $100 plus 5% technology fee. Blanket Type F Issued for 365 days to telecommunications and cable franchisee, and utilities for connections, repairs, pulling cable through existing conduit, and emergencies. Flat Rate $250 plus $5000 PW inspection deposit. Flat Rate $100/PW Inspection. Approved 09.25.02 Last Revised 01.01.19 1 BULLETIN Al Flood Control Issued whenever there is construction, development, or substantial improvement within a shoreline, a special flood hazard area, or a flood -prone area. An FCZP grants approval to construct or develop within a flood 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 land altering permit. Refer to Bulletin A7. Flat Rate $50 plus 5% technology fee... Water Meter - Permanent Issued for domestic water supply for 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. Fees listed below. Water Meter — Water Only Issued for a separate service from the main that will not discharge to the public sewer. The fee includes a City -provided water meter. Fees listed below. Water Meter - Deduct Required to meter water not discharged 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. Flat Rate $25. 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. Fees listed below. Reviews Each additional review, which is attributable to the Applicant's action or inaction shall be charged 25% of the Total Plan Review Fee. Revisions Charged for each revision to approved plans. Fee per revision is 25% of the Issuance and Inspection fee. Inspections Charged for each inspection after the first two at a rate of $70.00/inspection. Public Works inspection outside of normal business hours (three-hour minimum charge) - $105.00 per hour WATER METER FEE SHEET Permanent and Water Only Meters Size (inches) Installation Cascade Water Alliance RCFC 01.01.2019 —12.31.2019 Total Fee 0.75 $625 $6,416 $7,041 1 $1125 $16,040 $17,165 1.5 $2425 $32,080 $34,505 2 $2825 $51,328 $54,153 3 $4425 $102,656 $107,081 4 $7825 $160,400 $168,225 6 $12525 $320,800 $333,325 Temporary Meter 0.75" $300 2.5" $1,500 PAVEMENT MITIGATION AND TRANSPORTATION IMPACT FEES Please refer to Customer Assistance Bulletin A3 Pavement Mitigation and Transportation Impact Fees This Bulletin should not be used as a substitute for codes and regulations. Your project will be reviewed for specific compliance to codes and regulations. Approved 09.25.02 Last Revised 01.01.19 2 PUBLIC WORKS BULLETIN A2 TYPE C FEE ESTIMATE WORKSHEET CITY OF TUKWILA Public Works Department 206-433-0179 Type C permit fees are based on the value of the construction work. The City collects an Application Fee when the application is submitted and a Permit Issuance and Inspection fee when the permit is issued. Applicable permits having flat rates are added to the calculated fees and are due when the permit is issued. You may use this form to estimate PW Permit fees. This is an estimate only. Actual fees may vary. If you do not provide contractor bids with your permit application, Public Works will review the cost estimates for reasonableness and may adjust estimates. The permit fee covers the cost for two reviews and two inspections. The permit fee does not include fees for additional reviews, additional inspections, or for revisions to approved plans. These fees are charged separately and must be paid before PW Final Inspection. Refer to Bulletins Al, A4, and A6 for more information. Three activities trigger a Type C permit. They are 1) Construction in the right-of-way, 2) Construction on private property, and 3) Grading. The following information should help you determine if you need a Type C permit. Type C Construction Issued for 180 days for activities in the right-of-way and/or on private property. These activities include sewer, water, surface water, grading, street improvements, boring, culverts, curb cuts, paving, driveways, fences, landscaping, painting/striping, sidewalks, trenching, or utility installation/repair. This Bulletin should not be used as a substitute for codes and regulations. Your project will be reviewed for specific compliance to codes and regulations. Approved 09.25.02 Last Revised 02/21/17 PUBLIC WORKS BULLETIN A2 TYPE C FEE ESTIMATE WORKSHEET CITY OF TUKWILA Public Works Department 206-433-0179 Type C Grading Fills in the regulatory floodway shall not be permitted. Per TMC Chapter 16.54.050: • A grading permit does not include construction of retaining walls or other structures. • A grading permit is issued for 180 days for all grading operations, except for the listed exemptions: 1. Excavation for construction of a structure permitted under this 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 civil or geotechnical engineer. Exploratory excavation does not include grading to begin construction of a structure, prior to receiving a permit. This Bulletin should not be used as a substitute for codes and regulations. Your project will be reviewed for specific compliance to codes and regulations. Approved 09.25.02 Last Revised 02/21/17 BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees PROJECT NAME ,-\ ( ,4 PERMIT # D i S -- 0182 If you do not provide contractor bids or an engineer's estimate with your permit application, Public Works will review the cost estimates for reasonableness and may adjust estimates. 1. APPLICATION BASE FEE 2. Enter total construction cost for each improvement category: Mobilization Erosion prevention Water/Sewer/Surface Water Road/Parking/Access S L A. Total Improvements V)\.;) Q -� 3. Calculate improvement -based fees: B. 2.5% of first $100,000 of A. C. 2.0% of amount over $100,000, but less than $200,000 of A. D. 1.5% of amount over $200,000 of A. 4. TOTAL PLAN REVIEW FEE (B+C+D) 5. Enter total excavation volume Enter total fill volume cubic yards cubic yards Use the following table to estimate the grading plan review fee. Use the reater of the excavation and fill volumes. QUANTITY IN CUBIC YARDS RATE Up to 50 CY Free 51 — 100 $23.50 101 —1,000 $37.00 1,001— 10,000 $49.25 10,001 — 100,000 $49.25 for 1 sT 10,000, PLUS $24.50 for each additional 10,000 or fraction thereof. 100,001 — 200,000 $269.75 for 1 sT 100,000, PLUS $13.25 for each additional 10,000 or fraction thereof. 200,001 or more $402.25 for 1 sT 200,000, PLUS $7.25 for each additional 10,000 or fraction thereof. GRADING Plan Review Fees $250 (1) (4) $ (5) TOTAL PLAN REVIEW FEE DUE WITH PERMIT APPLICATION (1+4+5) $ The Plan Review and Approval fees cover TWO reviews: 1) the first review associated with the submission of the application/plan and 2) a follow-up review associated with a correction letter. Each additional review, which is attributable to the Applicant's action or inaction shall be charged 25% of the Total Plan Review Fee. RECEIVED CITY OF TUKWILA Approved 09.25.02 Last Revised 01.01.19 1 JUN 0 5 2019 D 161- ?Lb PERMIT CENTER BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION W may adjust estimated fees . Permit Issuance/Inspection Fee (B+C+D) 6 7. Pavement Mitigation Fee $ (7) The pavement mitigation fee compensates the City for the reduced life span due to removal of roadway surfaces. The fee is based on the total square feet of impacted pavement per lane and on the condition of the existing pavement. Use the following table and Bulletin 1 B to estimate the p Approx. Remaining Years Pavement Overlay and Repair Rate (per SF of lane width) 20-15 (100%) $10.00 15-10 (75%) $7.50 10-7 (50%) $5.00 7-5 (33%) $3.30 5-2 (25%) $2.50 2-1 (10%) $1.00 0-1 $0.00 8. GRADING Permit Issuance/Inspection Fee Grading Permit Fees are calculated using the following table. Use the greater of the excavation and fill volumes from Item 5. QUANTITY IN CUBIC YARDS RATE 50 or less $23.50 51 —100 $37.00 101 —1,000 $37.00 for 1st 100 CY plus $17.50 for each additional 100 or fraction thereof. 1,001 —10,000 $194.50 for lst 1000 CY plus $14.50 for each additional 1,000 or fraction thereof. 10,001 —100,000 $325.00 for the 1st 10,000 CY plus $66.00 for each additional 10,000 or fraction thereof 100,001 or more $919.00 for 1st 100,000 CY plus $36.50 for each additional 10,000 or fraction thereof. 9. Technology Fee (5% of 6+8) Approved 09.25.02 Last Revised 01.01.19 2 (8) (9) f of 41' BULLETIN A2 TYPE C PERMIT FEE ESTIMATE PLAN REVIEW AND APPROVAL FEES DUE WITH APPLICATION PW may adjust estimated fees 10. TOTAL OTHER PERMITS A. Water Meter — Deduct ($25) B. Flood Control Zone ($52.50 — includes Technology Fee) C. Water Meter — Permanent* D. Water Meter — Water only* E. Water Meter — Temporary* * Refer to the Water Meter Fees in Bulletin Al Total A through E $ (9) 11. ADDITIONAL FEES A. Allentown Water (Ordinance 1777) $ B. Allentown Sewer (Ordinance 1777) $ C. Ryan Hill Water (Ordinance 1777) $ D. Allentown/Foster Pt Water (Ord 2177) $ E. Allentown/Foster Pt Sewer (Ord 2177) $ F. Special Connection (TMC Title 14) $ G. Duwamish $ H. Transportation Mitigation $ I. Other Fees $ Total A through I $ (10) DUE WHEN PERMIT IS ISSUED (6+7+8+9+10+11) $ ESTIMATED TOTAL PERMIT ISSUANCE AND INSPECTION FEE This fee includes two inspection visits per required inspection. Additional inspections (visits) attributable to the Permittee's action or inaction shall be charged $70.00 per inspection. WATER METER FEE Permanent and Water Only Meters Size (inches) Installation Cascade Water Alliance RCFC 01.01.2019—12.31.2019 Total Fee 0.75 $625 $6,416 $7,041 1 $1125 $16,040 $17,165 1.5 $2425 $32,080 $34,505 2 $2825 $51,328 $54,153 3 $4425 $102,656 $107,081 4 $7825 $160,400 $168,225 6 $12525 $320,800 $333,325 Approved 09.25.02 Last Revised 01.01.19 Temporary Meter 0.75" $300 2.5" $1,500 3 From: R&M' Moos To: patdrkl Toaher Subject: FW: Holaday Parks - DCVA preference Date: Monday, August 10, 2020 9:25:34 AM Attachments: imaae001.ono FYI Robert Phipps, PIA, PWS, ISA-CA 1 Sr. Landscape Architect I PBS Vancouver 1360.567.2127 (direct) PBS is open for business. Learn how we're continuing to safely serve our clients at pbrusa com From: David Brower<davidbrower@waterdistrict125.com> Sent: Monday, August 10, 2020 9:21 AM To: Robert Phipps <Robert.Phipps@pbsusa.com> Subject: Re: Holaday Parks - DCVA preference I was not able to see the public works comments on the email but as long as the device is on the Washington state Doh certified list, The Device can be used for Backflow protection. Sent from my iPad On Aug 7, 2020, at 2:58 PM, Robert Phipps <Robert Phioosl01obsusasorrt> wrote: Hello David, I am checking up on the status of addressing Public Works comments for the DCVA. We are mostly looking for email response that we can pass along to them to complete their approval. Feel free to call if you would like to discuss. Thanks. Robert Phipps, PLA, PWS, ISA-CA, CESCL I Sr. Landscape Architect I PBS Vancouver 1360.567.2127 (direct) From: Robert Phipps Sent: Thursday, August 6, 2020 10:39:41 AM To: davidbrower(wwaterdistrirtl25.rom<ylavidhrowF r(wwaterdistrict175 cons> Cc: Patrick J. Togher <Patrick Togher/8obsusa com> Subject: Holaday Parks- DCVA preference Good morning David, I am corresponding with you on a project called Holaday Parks that has been going through the review process. Public works issued some comments (see below) during their review which asked us to contact the water district about any preference, standard details or notes for the backflow assembly and associated water connection for irrigation. Our details currently mention that the DCVA is to be WA state approved models. Did the water district have any standard details or notes they would prefer to include in the drawings instead? Feel free to call me if you would like to discuss. Thanks. 8) Applicant shall contact WD # 125 for approval of irrigation water connection and associated irrigation Double Check Valve Assembly (DCVA). The District might have their own notes and DCVA detail. Robert Phipps, PLA, PWS, ISA-CA, CESCL Senior Landscape Architect PBS 415 W 6th St., Suite 601, Vancouver, WA 98660 office: 360.695.3488 I direct: 360.567.2127 Tolbert ohinnsranhn to rnm PBS is open for business. Learn how we're continuing to safely serve our clients at phsusa corn City of Tukwila Department of Community Development August 03, 2020 DAVE SEGAL 1180 NW MAPLE ST, STE 160 ISSAQUAH, WA 98027 RE: Correction Letter # 1 DEVELOPMENT Permit Application Number D19-0182 HOLADAY-PARKS, INC. - 4625 S 134TH PL Dear DAVE SEGAL, Allan Ekberg, Mayor Jack Pace, Director This letter is to inform you of corrections that must be addressed before your development permit can be approved. All correction requests from each department must be addressed at the same time and reflected on your drawings. I have enclosed comments from the following departments: PLANNING DEPARTMENT: Meredith Sampson at (206)-431-3661 if you have questions regarding these comments. • Applicant applied for building permit prematurely. Must wait for L19-0059 and L19-0060 to be issued before issuance of building permit. • Show landscaping per what was approved under L19-0059 and L19-0060. PW DEPARTMENT: Joanna Spencer at 206-431-2440 if you have questions regarding these comments. • 1) Land Use permits are still pending. 2) Submit a Technical Information Report that outlines how the project conforms to the 2016 edition of King County Surface Water Manual. 3) Storm Drainage note #2 on sheet C-002 shall refer to KC Surface Water Design Manual 2016 edition. 4) The PBS Memo states that the existing site condition is gravel paving. It is my understanding that this gravel was placed on the site without a permit following the demolition of the residential house previously on site. 5) The planned dispersion trench appears to be approximately 30-ft from the property line. Typically, a dispersion trench should have a 100-ft flow path. 6) Permeable pavement is proposed within the vehicle parking stalls. The TIR should demonstrate that the soil conditions of this site meet the requirement of permeable pavement. 7) A Hydraulic Permit Application (HPA) from the Dept. of Fisheries is required if the stream along S 134th Place is disturbed. 8) Applicant shall contact WD # 125 for approval of irrigation water connection and associated irrigation Double Check Valve Assembly (DCVA). The District might have their own notes and DCVA detail. 9) The property owner shall execute with notary a Sensitive Area Hold Harmless agreement due to presence of steep slopes on site. This document will be recorded against the parcel at the property owner's expense. Please address the comments above in an itemized format with applicable revised plans, specifications, and/or other documentation. The City requires that two (2) sets of revised plan pages, specifications and/or other documentation be resubmitted with the appropriate revision block. In order to better expedite your resubmittal, a' Revision Submittal Sheet' must accompany every Tesubmittal. I have enclosed one for your convenience. Corrections/revisions must be made in person and will not be accepted through the mail or by a messenger service. 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 Sincerely, laf Bill Rambo Permit Technician File No. D19-0182 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 City of Tukwila Allan Ekberg, Mayor Department of Community Development - Jack Pace, Director December 13, 2019 Patrick Togher PBS Engineering and Environmental 214 E Galer St, Suite 300 Seattle, WA 98102 RE: Request for Application Extension #1 Permit Number D19-0182 Dear Mr. Togher, This letter is in response to your written request for an extension to application number D19-0182. The Building Official, Jerry Hight, has reviewed your letter and considered your request to extend the above referenced permit. It has been determined that the City of Tukwila Building Division will be granting an extension to the permit through June 5, 2020. If you should have any questions, please contact our office at (206) 431-3670. Sincerely, Bill Rambo Permit Technician File: Permit No. D19-0182 Tukwila City Hall • 6200 Southcenter Boulevard • Tukwila, WA 98188 • 206-433-1800 • Website: TukwilaWA.gov Bill Rambo From: Patrick J. Togher <Patrick.Togher@pbsusa.com> Sent: Wednesday, November 20, 2019 4:34 PM To: Bill Rambo Subject: FW: Holaday-Parks permit extension Attn: Bill Rambo, City of Tukwila We have received your letter indicating that the plan review for Permit Application D19-0182 at the Holiday -Park property is still incomplete and the application expiration date (December 5, 2019) is approaching. As nc }ed in your letter, we would like to apply for an extension of the expiration date. The original application was submitted concurrent with the Land Use permit (LU19-00059 and LU19-0060) and has been delayed until the land use permit was approved. In the meantime, the design team has prepared our res;::,onse to comments from the City. That response includes revised engineering, landscape, and architectural plans for the site, as well as additional documents to support the engineering for the parking lot design. These revised docur, ents were submitted to the City for review on November 18, 2019. We anticipate that a land use approval will follow that resubmittal, and would like to request that the current review period be extended by 90 days to accomnlodate the final land use approval and development permit reviews. Thanks you for your assistance in this matter, and please feel free to contact us if you have any question or need additional information. Regards, Patrick J. Togher, PWS Senior Project Manager PBS 214 E Gainr Street, Suite 300, Seattle, WA 98102 office: 206.233.9639 direct: 206.766.7618 I cell: 206.503.5407 patrick.torher@pbsusa.com phsusacorn .17 PBS Request for Permit Application Extension # I Current Expiration Date: jg.-5-'1 l p Extension Request: Approved for /6 - days Denied (provide explanation) Signature/Initials /i PBS is the assumed business name of PBS Engineering and Environmental Inc., en Oregon Domestic Corporation. This electronic communication,tand its attachments are intended only for the person(s) to whom it is addressed and may contain confidential information. If you are not the intended recipient of this message, you are hereby nOitted that any use, retransmission, distribution, reproduction or any action relying upon this message is prohibited. If you have recenr.id this information in error, please notify the sender. CAUTION: This email originated from outside the City of Tukwila network. Please DO NOT open attachments or click links from an unknown or suspicious origin. RECEIVED CITY OF TUKWILA NOV 2 1 2019 1 PERMIT CENTER City of Tukwila Department of Community Development 11/1/2019 DAVE SEGAL 1180 NW MAPLE ST, STE 160 ISSAQUAH, WA 98027 RE: Permit Application No. D19-0182 HOLADAY-PARKS, INC. 4625 S 134TH PL Dear DAVE SEGAL, Allan Ekberg, Mayor Jack Pace, Director In reviewing our current application files, it appears that your permit applied for on 6/5/2019, has not been issued by the City of Tukwila Permit Center. Per the International Building Code, International Mechanical Code, Uniform Plumbing Code and/or National Electrical Code every permit application not issued within 180 days from the date of application shall expire and become null and void. Currently your application has a status of UNDER REVIEW and is due to expire on 12/5/2019. If you still plan to pursue your project, you are hereby advised to do one of the following: 1) If the plan review is complete for the project and your application is approved, you may pick up the application before the date of expiration. At the time of permit issuance the expiration date will automatically be extended 180 days. -or- 2) If the plan review is not completed submit a written request for application extension (7) seven days in advance of the expiration date. Address your extension request to the Building Official and state your reason(s) for the need to extend your application. The Building Code does allow the Building Official to approve one extension of up to 90 days. If it is determined that your extension request is granted, you will be notified by mail. In the event that we do not receive your written request for extension or request is denied, your permit application will expire and your project will require a new permit application, plans and specifications, and associated fees. Thank you for your cooperation in this matter. Sincerely, Bill Rambo Permit Technician File No: DI9-0182 6300 Southcenter Boulevard Suite #100 • Tukwila Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665 PERMIT COORD COPY PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D19-0182 DATE: 9115/20 PROJECT NAME: HOLIDAY- PARKS, INC SITE ADDRESS: 4625 S 134TH PL Original Plan Submittal _X Response to Correction Letter # _i_ Revision # before Permit Issued Revision # after Permit Issued DEPARTMENTS: Building Division S ✓tW�- � 74020 Public Works Fire Prevention Structural n NHS ` --t .2o2 Planning Division It Permit Coordinator PRELIMINARY REVIEW: Not Applicable n (no approval/review required) DATE: 9/15120 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Corrections Required (corrections entered in Reviews) DUE DATE: Approved with Conditions Denied (ie: Zoning Issues) 11/10/20 Fire Fees Apply n Notation: REVIEWER'S INITIALS: DATE: /04 /2, 0 2- C) Permit Center Use Only CORRECTION LETTER MAILED: Departments issued corrections: Bldg 0 Fire 0 Ping ❑ PW ❑ Staff Initials. 12/18/2013 � 6I COORO CO PLAN REVIEW/ROUTING SLIP PERMIT NUMBER: D19-0182 PROJECT NAME: HOLIDAY -PARKS, INC SITE ADDRESS: 4625 S 134TH PL DATE: 06/05/19 X Original Plan Submittal Revision # before Permit Issued Response to Correction Letter # Revision # after Permit Issued DEPARTMENTS: 11 G — 0 —rq tl3uilding Division III C b1'3—(7 Public Works Pig ..1\6) Nwc t-- [� GDP41\20 Fire Prevention to-Ir.-0 Division Structural n Permit Coordinator a PRELIMINARY REVIEW: Not Applicable (no approval/review required) DATE: 06/06/19 Structural Review Required REVIEWER'S INITIALS: DATE: APPROVALS OR CORRECTIONS: Approved Approved with Conditions Corrections Required [ Denied (corrections entered in Reviews) (ie: Zoning Issues) DUE DATE: 07/04/19 Notation: REVIEWER'S INITIALS: DATE: Permit Center Use Only CORRECTION LETTER MAILED: cT i0o Departments issued corrections: Bldg ❑ Fire ❑ Ping PW.Nr Staff Initials: 12/18/2013 Date:08-18-2020 City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-431-3670 Web site: http://www.TukwilaWA.gov REVISION SUBMITTAL Revision submittals must be submitted in person at the Permit Center. Revisions will not be accepted through the mail, fax, etc. Plan Check/Permit Number: D 19-0182 ❑ Response to Incomplete Letter # ® Response to Correction Letter # 1 ❑ Revision # after Permit is Issued ❑ Revision requested by a City Building Inspector or Plans Examiner ❑ De wed Submittal # Project Name: Holiday- Parks, Inc Project Address: 4625 S 134 P1 Contact Person: Patrick Togher (PBS) Phone Number: 206.766.7618 Summary of Revision: Revised Sheet C-002 Storm Drainage Notes per City comments. Revised TIR per City Comments Other comments addressed in the Memo Response and supporting documents. RECEIVED CITY OF TUKWILA SEP 14 2020 PERMIT CENTER Sheet Number(s): C-002 "Cloud" or highlight all areas of revision including date of revision Received at the City of Tukwila Permit( Center by: Entered in TRAKiT on 1 L\ C:\Users\PatrickT\Desktop\Holaday\Holaday-Parks PW Revision Submittal Form_Complete.doc Revised: August 2015