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Home My WebLink AboutSEPA E99-0018 - HOT MIX PAVERS - NEW OFFICE AND SHOP BUILDINGHOT MIX PAVERS, INC. BUILD OFFICE & SHOP WITH PARKING & LANDSCAPING 4400 S. 131T" PL E99-0018 City of Thkwli Steven M. Mullet, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: Carol Lumb, Associate Planner Steve Lancaster, DCD Director FROM: Gary Schulz, Urban Environmentalist DATE: August 17, 2000 RE: Hot Mix Pavers #E98-0018, #D99-0417 - Technical Review, Wetland Buffer Reduction/Buffer Planting Plan I have reviewed the revised plan set, date stamped Received 8/14/00, for the Hot Mix Pavers office/shop development. Per my `memo of 3/29/00, the requested corrections to the `:Buffer Planting Plan" (Sheet LB 1) have been completed by Barghausen Consulting Engineers. However, Item 3), mitigation bond will need to be submitted as part of the land altering permit. The cost estimate ($13,868.00) for the plant material/plant installation, maintenance, and 3 -yr monitoring is ° approved. The required amount for this performance bond is 150 percent. Therefore, the approved amount is $20,802 and will specifically cover the sensitive area requirement through the monitoring period. Wetland buffer plantings will be more successful if installed in early fall to late winter. Please let me know if there are questions. Cc: Jack Pace, Planning Manager Joanna Spencer, Associate Engineer 6300 Southcenter Boulevard, Suite #100 0 Tukwila, Washington 98188 0 Phone: 206-431-3670 0 Fax: 206-431-3665 NG ENG' • • PROJECT NAME: LOCATION: CLIENT: DATE OF ESTIMATE: PROJECT NO: PERMIT APPLICATION NOS: PREPARED BY: BUFFER MITITATION COST ESTIMATE 7 Barghausen Consulting Engineers, Inc. Hot Mix Pavers 4400 South 131st Place, Tukwila, Washington Hot Mix Pavers August 10, 2000 7099 E98-0018, D99-0417 H. Bruce McCrory, RLA ITEM NO. DESCRIPTION QUANTITY UNIT UNIT PRICE COST 1 Site Grading/Clearing/Top Soil Preparation 5,940 SF $0.40 $2,376 2 Irrigation (System or Spot/Truck) 5,940 SF $0.50 $2,970 3 Plant Material (including Installation and Labor) 1 LS $3,740.00 $3,740 4 Miscellaneous (Signs, Fencing, etc.) 3" Mulch 59.4 CY $30.00 $1,782 5 Maintenance: Mitigation Period 3 Years 1 LS $1,000.00 $1,000 6 Monitoring Fees (No. Visits 4; No. Reports 4) 1 LS $2,000.00 $2,000 7 $0 8 $0 9 $0 10 $0 11 $0 12 $0 13 $0 14 $0 15 $0 16 $0 REOENUD SUBTOTAL: C O R R F O N CITY OF TUKWII A $13,868.00 Bond/Performance Multiplier (%) Q T R# AUG 1 i 2000 TOTAL: 'FRMIT MITER $13,868.00 8/10/00 1b) 99'(HI7 7099.010 [HBMfjssl • 1. Consultant cannot and does not guarantee or warrant the accuracy of the unit prices as indicated. These unit prices are based upon general experience and may be subject to significant variations at the time actual bids are received. 2. This estimate has been prepared for the purpose of giving the client and consultant an approximate understanding of the general range of construction costs that may be expected for this project, based upon the information that the consultant had available at the time this estimate was completed. Consultant makes no guarantee or warranty, expressed or implied, that ALL aspects of the construction effort expected for the project have been included, and the client is advised to budget appropriately for contingencies and items not covered or included in this summary 3. If the client desires a more definitive cost estimate, actual construction bids and/or the services of a qualified construction estimator should be utilized by the client. 4. This estimate is based on the following described plan sheets: Sheet Number Description Date LB1 of 1 Buffer Planting Plan Rev. 3, 8/9/00 12 of 4 Irrigation Plan Rev. 3, 8/9/00 RECEIVED CITY OF TUKWILA AUG 1 4 2000 PERMIT CENTER 8/10/00 2 of 2 7099.010 [HBM/jssl King County Department of Assessments King County Administration Bldg. 300 Fourth Avenue, Room 709 Seattle, WA 98104-2384 (206) 296-5141 FAX (206) 296-0106 RECEIVED JUL 13 2000 COMMUNITY DEVELOPMENT City of Tukwila Department of Community Development 6300 Southcenter Boulevard Tukwila, Washington 98188 Re: Lot Consolidation No L99-0083 Recording No 20000516000676 • Scott Noble Assessor July 11, 2000 The parcel numbers 731j920 0220, 0225, 0230 and 0235 will not be merged into one account, as requested by the above noted lot Consolidation No L99-0083. Accounts 73b920 0220,..0225 & 0230 are under the levy code of 2380, which is not under the water district 125. Account 73!1920 0235 is under the water distArt 125 with levy code of 21400. Therefore, we cannot change the levy codes and the merge will not be completed. We can merge accounts 73b920 0220, 0225 & 0230 into one account. Elaine Hawkins Abstract Technician (206) 296 5136 -Phone (206) 296 0106 Fax • city of Tukwila Steven M. Mullet, Mayor Department of Community Development Steve Lancaster, Director PLANNING DIVISION COMMENTS DATE: June 27, 2000 APPLICANT: Hot Mix Pavers RE: D99-0417 ADDRESS: 4400 South 131St Place Please review the following comments listed below and submit your revisions accordingly. If you have any questions on the requested revision, Carol Lumb is the planner assigned to the file and can be reached at 206-431-3661. 1. The most recent submittal does not respond at all to the comments in the March 29, 2000 Memorandum from Gary Schulz to Carol Lumb and Steve Lancaster recommending approval of the wetland buffer reduction. A copy of that Memorandum was included in the materials attached to Correction Letter #3, mailed to the applicant on April 27, 2000. In that Memorandum, Mr. Schulz identified three items that needed to be addressed or corrected in the plans. These items must be addressed before a building permit can be issued for this project. cc: Gary Schulz, Urban Environmentalist Anita Western, Hot Mix Pavers q:\carol\general\ 1999-memos\d99-0417-3.doc 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206-431-3670 • Fax: 206-431-3665 • Cizy of Tukwila • Steven M Mullet, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: Carol Lumb, Associate Planner Steve Lancaster, DCD Director FROM: Gary Schulz, Urban Environmentalist DATE: March 29, 2000 RE: Hot Mix Pavers #E98-0018, #D99-0417 - Technical Review, Wetland Buffer Reduction/Buffer Planting Plan ove `"44'd• • wo-ov I have reviewed the revised plan set, date stamped Received 3/7/00, for the Hot Mix Pavers office/shop development. The project is subject to sensitive area regulations and proposes a wetland buffer reduction. My review is focused on the "Buffer Planting Plan" (Sheet LB1) completed by Barghausen Consulting Engineers (11/8/99). I am recommending approval of the buffer reduction from 50 feet to 25 feet for the Type 2 wetland area. The 25 -foot buffer area has existing native vegetation to be preserved but will be enhanced through new plantings and weed removal and maintenance. Prior to permits being issued for site development, the following items need to be corrected on the plan or otherwise addressed: 1) Under the Section for Construction Notes add a statement to reflect a pre -construction meeting to occur on the site with landscape designer, landscape contractor, and city staff. 2) Construction Notes: #6. and #7. C. will be revised to eliminate wording related to applying a seed mix. Mulching is appropriate and hopefully can include a type that will provide some nitrogen. 3) Please provide a cost estimate of the plant material/plant installation, maintenance, and 3 -year monitoring to be approved for a mitigation bond or other performance. Please let me know if there are questions. Cc: Jack Pace, Planning Manager Joanna Spencer, Associate Engineer 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206-431-3670 • Fax: 206-431-3665 Phil Schneider Washington State Department of Fish and Wildlife 3190 - 160th Avenue S.E. Bellevue, WA 98008-5452 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES March 3, 2000 RE: Request for HPA Approval for the Hot Mix Pavers Project 4400 South 131st Place, Tukwila, Washington Our Job. 7099 Dear Phil: RECEIVED CITY OF.. TUKWILA MAR 0 ? 2000 PERMIT CENTER At the request of the City of Tukwila, we are submitting for HPA approval for the Hot Mix Pavers project. Enclosed is one set of construction plans that are near approval by the City of Tukwila for an approximate 1 - acre site. As you can see, this project includes the installation of a small office and garage building with an outdoor storage lot for associated equipment with the business. There is an existing wetland located along the eastern portion of the project adjacent to SR -599, which will be the discharge point for the majority of the project. There is also a small amount of road improvements proposed adjacent to South 131st Place, which will include a curb, gutter, sidewalk, asphalt widening, and the installation of one catch basin. This catch basin will discharge into an existing drainage channel along the west side of South 131st Place. Also, enclosed is a copy of the drainage report and the stormwater pollution prevention plan prepared for this project. This stormwater pollution prevention plan contains measures that the owner must utilize after construction is complete for proper maintenance, etc. Also, enclosed is a copy of your JARPA application, which is signed by the owner of the project and me as the representative. Please review these documents and let me know if you have any questions or would like to meet on site. I appreciate your help in processing this approval document and look forward to hearing from you. Thank you. CORRE TlQ N LTR#: I o'er Hal P. Grubb, P.E. Director of Engineering Services HPG/ca/mm 7099C.014 enc: As Noted cc: Anita Westeren, Hot Mix Pavers (w/ copy of JARPA application) pqq-cMr7 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX www.barghausen.com awitA crri of 113 BAR ®1%%% CORRECTION LTR# &Hitt, CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES 9' OUR JOB NO. 7099 MARCH 1, 2000 Prepared By: 'EXPIRES: baa M 1 BARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251-6222 q-cy-f • • Stormwater Pollution Prevention Plan Hot Mix Pavers, Inc. File No. D99-0417 Site Address: The project is located on the north side of South 131st Place at the 4400 block of Tukwila, Washington, in a portion of the northeast quarter of Section 15, Township 23 North, Range 4 East, Willamette Meridian, King County, Washington. Introduction: This project will consist of the a new combined service office building, parking lot, storm drainage, landscaping, and utility construction. The area of the project is 1.02 acres, of which approximately 80 percent will be impervious. On-site drainage will be picked up by catch basins and conveyed through a storm drainage water quality tank located at the north portion of the parking lot. Roof drainage from the building will be conveyed directly into the catch basin system previously described. Storm drainage discharges from the proposed water quality wet tank via storm drainage tightline systems to the ditch along the south side of SR -599 and ultimately discharges to the Green River. Owner: Hot Mix Pavers, Inc. 4400 South 131st Place Tukwila, WA 98188 (206) 324-0106 Contact: Anita Westeren Plan Goal: The goal of the grading and storm drainage plan is to treat all on-site runoff for water quality by directing all parking lot runoff through the storm drainage wet tank. Preventive Best Management Practices (BMPs): Catch basins shall have "dump no waste - drainage to river" stamped next to them. The parking lot shall be swept, as necessary, to remove debris and prevent silt and litter debris from entering the storm drainage conveyance system. Treatment BMPs: The on-site storm drainage wet tank has been designed as a flow-through mechanism to treat runoff for conventional pollutants. The 1998 King County Surface Water Design Manual was used to design the water quality tank for this project. Inspection: The storm drainage water quality tank shall be inspected at least twice a year and as required following periods of heavy runoff. Maintenance records must be kept for a minimum of 5 years and be available for City inspector review. Maintenance: To ensure proper water quality treatment, the storm drainage water quality wet tank must be properly maintained. The following are maintenance requirements that must be followed. MAINTENANCE CONDITIONSbe fRES ol COMPONENT DEFECT MAINTENANCE IS NEEDED EXPECTED WHEN MAINTENANCE IS PERFORMED Storage area Plugged air vents One-half of the cross section of a vent is blocked at any point with debris and sediment. Vents free of debris and sediment. 7099.007 [JPJ/ph/smj MAINTENANCE COMPONENT DEFECT CONDITIONS WHEN MAINTENANCE IS NEEDED RESULTS EXPECTED WHEN MAINTENANCE IS PERFORMED Debris and sediment Accumulated sediment depth exceeds 10 percent of the diameter of the storage area for one-half length of storage vault or any point depth exceeds 15 percent of diameter. Example: 72 -inch storage tank would require cleaning when sediment reaches a depth of 7 inches for more than 1/2 length of tank. All sediment and debris removed from storage area. Joints between tank/pipe section Any crack allowing material to be transported into the facility. All joints between tank/pipe sections are sealed. Tank pipe bent out of shape Any part of tank/pipe is bent out of shape more than 10 percent of its design shape Tank/pipe repaired or replaced to design Manhole Cover not in place Cover is missing or only partially in place. Any open manhole requires maintenance Manhole is closed Locking mechanism not working Mechanism cannot be opened by one maintenance person with proper tools. Bolts into frame have less than 1/2 inch of thread (may not apply to self-locking lids). Mechanism opens with proper tools. Cover difficult to remove One maintenance persons cannot remove lid after applying 80 lbs of lift. Intent is to keep cover from sealing off access to maintenance. Cover can be removed and reinstalled by one maintenance person., Ladder rungs unsafe King County Safety Office and/or maintenance person judges that ladder is unsafe due to missing rungs, misalignment, rust, or cracks. Ladder meets design standards, allows maintenance person safe access. Catch basins See "Catch Basins" Standard No. 5. See "Catch Basins" Standard No. 5. 7099.007 [JPJ/ph/sm] To ensure proper water conveyance to the water quality wet tank, the catch basins should be maintained as follows: MAINTENANCE COMPONENT DEFECT CONDITIONS WHERES N MAINTENANCE IS NEEDED ULTS EXPECTED WHEN MAINTENANCE IS PERFORMED General Trash and debris (includes sediment) Trash or debris of more than 1/2 cubic foot, which is located immediately in front of the catch basin opening or is blocking capacity of the basin by more than 10 percent. No trash or debris located immediately in front of the catch basin opening. Trash or debris (in the basin) that exceeds 1/3 the depth from the bottom of the basin to invert the lowest pipe into or out of the basin. No trash or debris in the catch basin. Trash or debris in any inlet or outlet pipe blocking more than 1/3 of its height. Inlet and outlet pipes free of trash or debris. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g. methane). No dead animals or vegetation present within the catch basin. Deposits of garbage exceeding 1 cubic foot in volume. No condition present which would attract or support the breeding of insects or rodents. i Structure damage to frame and/or top slab Corner of frame extends more than 3/4 inch past curb face into the street (if applicable). Top slab is free of holes and cracks. Frame not sitting flush on top slab, i.e., separation of more than 3/4 inch of the frame from the top slab. Frame is sitting flush on top slab. Cracks in basin walls/bottom Cracks wider than 1/2 inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that structure is unsound. Basin replaced or repaired to design standards. 7099.007 [JPJ/ph/sm] MAINTENANCE COMPONENT DEFECT CONDITIONS WHENN'TS MAINTENANCE IS NEEDED RES EXPECTED WHEN MAINTENANCE IS PERFORMED Cracks wider than 1/2 inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering catch basin through cracks. No cracks more than 1/4 inch wide at the joint of inlet/outlet pipe. Sediment/ misalignment Basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. Basin replaced or repaired to design standards. Fire Hazard Presence of chemicals such as natural gas, oil and gasoline. No flammable chemicals present. Vegetation Vegetation growing across and blocking more than 10 percent of the basin opening. No vegetation blocking opening to basin. Vegetation growing in inlet/outlet pipe joints that is more than six inches tall and less than six inches apart. No vegetation or root growth present. Pollution Nonflammable chemicals of more than 1/2 cubic foot per three feet of basin length. No pollution present other than surface film. Catch basin cover Cover not in place Cover is missing or only partially in place. Any open catch basin requires maintenance. Catch basin cover is closed. Locking mechanism not working Mechanism cannot be opened by maintenance person with proper tools. Bolts into frame have less than 1/2 inch of thread. Mechanism opens with proper tools. Cover difficult to remove One maintenance person cannot remove lid after applying 80 lbs. of lift; intent is to keep cover from sealing off access to maintenance. Cover can be removed by one maintenance person. Ladder Ladder rungs unsafe Ladder is unsafe due to missing rungs, misalignment, rust, cracks, or sharp edges. Ladder meets design standards and allows maintenance person safe access. 7099.007 [JPJ/ph/sm] MAINTENANCE COMPONENT DEFECT CONDITIONS WHEN NEEDED RES EXPECTED WHEN MAINTENANCE IS WHENIS PERFORMED Metal grates (if applicable) Sediment and debris Grate with opening wider than 7/8 inch. 1 Grate opening meets design standards. Trash and debris Trash and debris that is blocking more than 20 percent of grate surface. Grate free of trash and debris. Damaged or missing Grate missing or broken member(s) of the grate. Grate is in place and meets design standards. To ensure proper stormwater conveyance, the conveyance system must be properly maintained. Following are the maintenance requirements to be followed: MAINTENANCE COMPONENT DEFECT CONDITIONS WHEN MAINTENANCE IS NEEDED RESULTS EXPECTED WHEN MAINTENANCE IS PERFORMED Pipes Sediment and debris Accumulated sediment that exceeds 20 percent of the diameter of the pipe. Pipe cleaned of all sediment and debris. Vegetation Vegetation that reduces free movement of water through pipes. All vegetation removed so water flows freely through pipes. Damaged Protective coating is damaged; rust is causing more than 50 percent deterioration to any part of pipe. Pipe repaired or replaced. Any dent that decreases the cross section area of pipe by more than 20 percent. Pipe repaired or replaced. Open ditches Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Trash and debris cleared from ditches. Sediment Accumulated sediment that exceeds 20 percent of the design depth. Ditch cleaned/flushed of all sediment and debris so that it matches design. Vegetation Vegetation that reduces free movement of water through ditches. Water flows freely through ditches. 7099.007 [JPJ/ph/sm] MAINTENANCE COMPONENTWHEN DEFECT CONDITIONS WHEN MAINTENANCE IS NEEDED RESULTS EXPECTED MAINTENANCE IS PERFORMED General Erosion damage to slopes See "Ponds" Standard No. 1 See "Ponds" Standard No. 1. Rock lining out of place or missing (if applicable) Maintenance person can see native soil beneath the rock lining. Replace rocks to design standards. Catch basins Trash or litter See "Catch Basins" Standard No. 5. See "Catch Basins" Standard No. 5. Debris Barriers (e.g., Trash Rack) Damaged See "Debris Barriers" Standard No. 6 See "Debris Barriers" Standard No. 6 To ensure proper maintenance of the grounds and landscaping, the following maintenance requirements must be followed: MAINTENANCE COMPONENT DEFECT CONDITIONS WHERFS N MAINTENANCE IS NEEDED ULTS EXPECTED WHEN MAINTENANCE IS PERFORMED General Weeds (nonpoisonous) Weeds growing in more than 20 percent of the landscaped area (trees and shrubs only). Weeds present in less than 5 percent of the landscaped area. Safety hazard Any presence of poison ivy or other poisonous vegetation. No poisonous vegetation present in landscaped area. Trash or litter Paper, cans, bottles, totaling more than 1 cubic foot within a landscaped area (trees and shrubs only) of 1,000 square feet. Area clear of litter. Trees and Shrubs Damaged Limbs or parts of trees or shrubs that are split or broken which affect more than 25 percent of the total foliage of the tree or shrub. Trees and shrubs with less than 5 percent of total foliage with split or broken limbs. Trees or shrubs that have been blown down or knocked over. Tree or shrub in place free of injury. Trees or shrubs which are not adequately supported or are leaning over, causing exposure of the roots. Tree or shrub in place and adequately supported; remove any dead or diseased trees. 7099.007 [JPJ/ph/sm] King County Department of Natural Resources Industrial Waste Program 130 Nickerson Street, Suite 200 Seattle, WA 98109-1658 (206) 263-3000 (206) 263-3001 FAX February 28, 2000 .-CER'1111ED MAIL RETURN RECEIPT REQUESTED Anita Westerer Hot Mix Pavers, Inc. 1122 East Pike Street, Suite 1345 Seattle, Washington 98122 CORRSTJ.pN LTR# �L RECEIVED CITY OF. TUKWILA MAR 0 7 2000 PERMIT CENTER Approval of Oil/Water Separator Design for Hot Mix Pavers, Inc. Dear Ms. Westerer: King County Industrial Waste has received the plans submitted on your behalf by Barghausen Consulting Engineers for the oil/water separator to be installed at the Hot Mix Pavers facility located at 4400 South 131n Street in Tukwila, Washington. Approval is hereby given for the design of this separator. MAR 02 2000 7097 Discharge of treated wastewater from this separator to the sanitary sewer is .authorized subject to the following conditions: 1. No significant amount of storm drainage shall enter the sanitary sewer; i.e., the uncovered area tributary to the separator shall not exceed 200 square feet. 2. The oil/water separator sampling port or inspection tee on the outlet line shall be accessible to King County personnel during normal hours of facility operation. 3. The oil/water separator shall be properly maintained so that effluent from these structures does not exceed the King County discharge limitation of 100 milligrams per liter (mg/1) of mineral/petroleum (nonpolar) fats, oils, and grease (FOG) or 100 mg/1 of animal vegetable (polar) FOG. This design approval does not in any way guarantee that the oil/water separator will function as described by the fabricator or manufacturer. Further, the approval does not relieve Hot Mix Pavers or any subsequent operator, of the responsibility to enlarge, modify, or replace the oil/water separator to meet King County discharge requirements. 1�tq-oyn Cizi' of Tukwila Steven M. -Mullet, Mayor Department of Community Development Steve Lancaster, Director PLANNING DIVISION COMMENTS DATE: February 25, 2000 APPLICANT: Hot Mix Pavers RE: D99-0417 ADDRESS: 4400 South 131st Place Please review the following comments listed below and submit your;revisions accordingly. If you have any questions on the requested revision, Carol Lumb is the planner assigned to the file and can be reached at 206-431-3661. 1. The revision materials did not include the storm water pollution prevention plan, nor indicate the location of the structure to cover the stored asphalt as requested in the January 13, 2000 comments from the Planning Division. With regard to the structure to cover the stored asphalt, the structure can be designed with either a hinged roof or other removable cover. I would like to note that the revision materials were submitted on February 18, 2000. I received a call at 12:50 that day from the applicant's engineering firm asking what was meant by the term "storm water pollution prevention plan." The caller noted that they wanted to resubmit the revision materials that day. I returned the call at 1:58 the same day with direction on where to find guidance on storm water pollution prevention plans. It appears that that message was either not received or ignored. I would like to stress that submitting incomplete revision materials will only continue to delay approval of this project. cc: Anita Western c:\carol\general\D99-0417-2.doc 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206-431-3670 • Fax: 206-431-3665 AGENCY USE ONLY Agency Reference #: - SEPA Lead Agency: Other: Date Received: - JARPA APPLICATION FORM - - for use in Washington State - PLEASE TYPE OR PRINT IN BLUE OR BLACK INK Based on the preceding checklist, I am sending copies of this application to the following: (check all that apply) O Local Government: for shoreline 0 Substantial Development 0 Conditional Use 0 Variance 0 Exemption; or 0 Floodplain Management 0 Critical Areas Ordinance El Washington Department of Fish and Wildlife for HPA `, O Washington Department of Ecology Approval to Allow Temporary Exceedance of Water Quality Standards O 401 Water Quality Certification Nationwide Permits 1 O Corps Engineers for Section 404 or Section 10 permit(s) SECTION A - Use for all permits covered by this application. Be sure to also complete Section C (Signature Block) for all permit applications. 1. Applicant HOT MIX PAVERS . ANITA WESTEREN Mailing Address 1122 EAST PIKE STREET. SUITE 1/45 ' SEATTLE. WA 98122 Work Phone: (200 324-0106 Home Phone: ( ) Fax number. (200 325-4473 ' Ilan agent is acting for the applicant during the permit process, complete #2 & 3. - j 2. Authorized Agent HAL GRUBB, BARGHAUSEN CONSULTING ENGINEERS, INC. ... Mailing Address 18215 -72nd AVENUE SOUTH, . KENT, WASHINGTON 98032 , Work Phone: (+25) 251-6222 Home Phone: ( ) ' Fax number. (125) 251-8782 3. Designation of Authorized Agent, if applicable: / - • I hereby designate `/ ,t / 6rzi 41 to act as my agent in matters related to this application for permit(s). I understand that if a Federal permit is issued, I must sign the permit. —...........,—.._.u..--- � a o2 02ac�a Si . ture of Applicant Date 4. Relationship of applicant to property: la Owner 0 Purchaser 0 Lessee 0 Other ( ) 5. Name, address, and phone number of property owner(s), if other than applicant GF.044 Application Page 1 of 5 6. Location where proposed activity exists or will occur: Street Address 4400 SOUTH 131ST PLACE TUKWILA, WA 98168 City, County, State, Zip Code Waterbody DNR Stream Type (if known) Tributary of GREEN RIVER Legal Description: Tax parcel No.: 734920-0220,0225,0230,0235 1/4 1/4 Section Township Range NE -1/4 15 23 NORTH 4 EAST 7. Describe the current use of the property, and structures existing on the property. If -any -portion of the proposed activity is already completed on this property, indicate month and year of completion. THE SITE IS VACANT LAND THAT'HAS GRAVEL FILL PLACED ON MOST OF IT. VACATED RUTH STREET FORMS THE WEST PROPERTY BOUNDARY. Is the property agricultural land? 0 Yes dlNo Are you a USDA program participant? 0 Yes Y7 No 8. Describe the proposed activity, and the activity's purpose. Include expected water quality and fish impacts, and proposed actions to reduce the duration and severity of those impacts and provide proper protection for fish life. Complete plans and specifications should.be provided for all work waterward of the Ordinary Nigh Water Mark or Line, including types of equipment to be used, and for all work if applying for a shoreline permit. If additional space is needed, please attach a• separate, sheet: •a _. THE PROPOSED ACTIVITY-3FOR .THIS PROJECT' IS,.TO':::CONSTRUCT A 2,700 SQUARE FEET BUILDING, 'PARKING AREAS FOR EQUIPMENTTSTORAGE, APPROPRIATE LANDSCAPING, •• STORMWATER CONVEYANCE SYSTEM AND UNDERGROUND WATER QUALITY WET TANK:: THE. PRE—DEVELOPED AND POST -DEVELOPED DIFFERENCE IN 100—YEAR PEAK • RUNOFF•:'RATE:IS•LES SH. THAN 0:1 CFS. CONSTRUCTION EQUIPMENT WILL INCLUDE: A. BACKHOE ,COMPACTOR, TRUCK •AND GRADER. THE SITE, -IS BASICALLY:A.BALANCED SITE WITH NO NET -CUT:. OR FILL. THE • PROJECT INCLUDES • STREET" WIDENING,. .CURB, GUTTER, AND SIDEWALK ALONG' I.TS' FRONTAGE ON SOUTH 131ST PLACE. RUNOFF FROM THE:NEW Sd'REEYF.. ROVEMENTS WILL BE CONVEYED:* TO A STREAM 'ON.. THE SOUTH 'SIDE OF SOUTH::-T21SVPLACE, RUNOFF FROM :ON,SITE WILL 'BE. 'CONVEYED TOA WETLAND -:ALONG THE''NORTHEAST:.PROPERTY LINE: BOTH DIQSCHARGE POINTS DRAIN TO THE SAME CONVERGENT. POINT AT THE UPSTREAN SIDE OF THE CULVERT UNDER SR -599 NORTHWEST OF THE SITE. Preparation of drawings: See Appendix A - sample drawings and checklist for completing the drawings. One set of original or good quality reproducible drawings must be attached. NOTE: Applicants are encouraged to submit photographs of the project site, but these do not substitute for drawings. THE CORPS OF ENGINEERS REQUIRES DRAWINGS ON 8-12 X 11 INCH SHEETS. Larger drawings may be required by other agencies. GF.044 Application Page 2 of 5 9. Proposed Starting Date: APRIL 2000 Will the project be constructed in stages? 0 Yes 30XNo Estimated duration of activity: 3 MONTHS 10. Will any structures be placed: a. waterward of the Ordinary High Water Mark or Line for fresh or tidal waters? b. waterward of Mean High Water Line in tidal waters? 0 Yes JNo 0 Yes X:1 No 11. Will fill material (rock, fill, bulkhead, pilings or other material) be placed waterward of Ordinary High Water Mark or Line for fresh or tidal waters? 0 Yes Xi No a. If "yes," in fresh water indicate volume in cubic yards: b. If "yes," in tidal waters, indicate volume in cubic yards waterward of the line of mean higher high water: - 12. Will material be placed in wetlands? If yes: 0 Yes Mc No If yes, impacted area: (acres) a. Has a delineation been completed? 0 Yes MN No (If yes, please submit with application.) b. Type and composition of fill 'material (e.g., sand, etc.): c. Material source: - • - d. List all soil series (type of oil) located at the project site, & indicate if they are on the county's list of hydric soils: Soils information can be obtained from -the Natural Resources Conservation Service (NRCS), formerly Soil Conservation Services (SCS). 13. Will proposed activity cause flooding or draining of wetlands? 0 Yes xx No Ifyes, impacted area: (acres) 14. Will excavation or dredging be required in.water or wetlands? flyer, volume: (cubic yards) ' - - a. Composition of material removed: b. Disposal site for excavated material: c. Method of dredging: " • 0 yes NY No 15. List other applications, approvals; or certifications from other Federal, state or local agencies for any structures, construction, discharges, or other activities described in the application (Le., preliminary plat approval, health district approval, building permit, SEPA review;FERC license, Forest Practices Application, eta.) Also indicate whether work has been completed and indicate all existing work Oti'Arawings. Date of Date Completed? Type of Approval Issuine.Agency Identification No. Application Approved Yes or No BUILDING PERMIT TUKWILA D99-0417 NO SEPA Lead Agency: CITY OF TUKWILA SEPA Decision Date: GF.044 Application Page 3 of 5 • 16. Has any agency denied approval for the activity described herein or for any activity directly related to the activity described herein? 0 Yes xat No Ifyes, explain: SECTION B - Use for Shoreline & Corps of Engineers permits only: 17. Total cost of Project. This means the fair market value of the project, including materials, labor, machine rentals, etc. 18. Local government w/jurisdiction:. Shoreline Environment designation: Zoning Designation: . 19. For corps permits, provide names, addresses, and telephone numbers of adjoining property owners, lessees, etc., PLEASE NOTE:. Shoreline management compliance may require additional notice.- consult your local government. SECTION C - Complete for any permit covered by this application 20. Application is hereby made for a permit or permits to authorize the activities described herein. I certify that I am familiar with the information contained in this application, and that to the best of my knowledge and beliefs, such information is true, complete, and accurate. I further certify that I. possess the authority to undertake the proposed activities. I hereby grant to the agencies to which this application is made, the right to enter the above-described location to inspect the proposed or completed work. Signature of Applicant or Authorized Agent (REQUIRED) Date Signature of Landowner (REQUIRED if other than applicant) Date 2 • Zj- vo 0.2 -.2 a0 This application must be signed by the applicant. If an authorized agent is to be designated, the applicant must also sign at Item #3. 18 U.S.C. §1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States knowingly falsifies, conceals, or covers up by any trick, scheme, or device a material fact or makes any false, fictitious, or fraudulent statements or representations or makes or uses any false writing or document knowing same to contain any false, fictitious, or fraudulent statement or entry, shall be fined not more than 510,000 or imprisoned not more than 5 years or both. DO NOT SEND FEDERAL PROCESSING FEE WITH APPLICATION GF.044 Application Page 4 -of 5` • • CONVERSATION RECORD DATE: L / 1'g /02,o00 WED THU T SUN TIME: t Z:v0 PM TYPE: ❑ Visit ❑ Conference EKTelephone- 0Incoming d Outgoing Name of person(s) contacted or in contact with you: twi tt- FOR OFFICE USE ONLY Organization (office, dept., bureau,retc.) e til Location of Visit/Conference: Telephone No.: yLS'— tl- q- 1022 SUBJECT: )-A,`AA Rul°YS 5'Ttnty_ "j tr hark— SUMMARY: P -ti. fi, raw", atawv. rtv.o- . ✓b 4,014/04-- A-Or t,0-► / A -o,(' - hwN.v cn T P-tv) -w-Piwl/' uw, 6u14—(r iA41')hu.1/I- U' - IS a I X 11 c — - c w• - lb 44- co-ev orvdtfiTiucer n‘A- 41 G - fit- _ f€ 4' L�re�PcC CA Y rvt„yeti: . ry po€. 14.42,4) o c Oti 19-tac/C b vv. 4-L 4- Gtt-A4 umet. i va, - uv ' x Lrd dful4 Do E ^t- 5ywwk..9.-- ulcerI -1 _VW! ►de.f. Ci 44) O, etn `7, 12- X g k1/► ot, t3/17) c„ 67, w1/41 c.0 v e✓ v vka/pvc-C- a✓ .1 LU - Sstn rte, - v ri z-( - tu,✓,o ✓l`c woji stlitacl Iivxav atwL �� Ca/Le/4 Ito SL✓(11' Gt J S - 1p 4' t e�., h v� arM- o vee— 53-tvv,1 w p e t1t4,� bd'attt 4<. - G 4-176/3 ljLcvp l te'vip tai i' ! 5/a, C., Signature: Title: Date: G.033 c. 4 p h%—VY FOR OFFICE USE ONLY CONVERSATION RECORD DATE: c2._. / l.a /01300 MON4E JE WED THU C SAT SUN A.M. TIME: 1Z;J(] P.M TYPE: ❑ Visit ❑ Conference $ Telephone- (Incoming 0Outgoing Name of person(s) contacted or in contact with you: Organization (office, dept., bureau, etc.) find elinaA) -.- Location of VisiVcdnterence: Telephone No.: .251-(e2-.2 SUBJECT: 11,bi M Pav w_s SUMMARY: W 'icbs (itt,Lut OJ✓'' 1 - l 3 n.,14410 - c.4VY' yl.€a-rte S� SfU✓M r o uff m., c fv, 4-C e lgti. - w -t -LW cam- O Vex, rv,-u4.., \ntU C Pn✓\ UWW i �J C�- t . S TW wu,GL 1� to ' vu LC' w aiJ- vv -44-3 1'. 5 CC ALIAVVv44, Wit-( — ". _ S ys wc„ e-wa -f -ohn el -co t. ry CL - r 'ru K J, 11) `f-€ 3 el Srt#6 '�.ti" `tet-tof dil t` )54Ap p)6,4,-Ittr 1w . tsv-. cru to al,Ck lin,. �a1-- c..r---ham-( Signature: Title: G"o c&x&-ea4A--f--- Date: 12s12600 • city of Tukwila Steven Al:, Mullet, Mayor Department of Community Development Steve Lancaster, Director January 31, 2000 Ms. Anita Western Hot Mix Pavers 1122 East Pike Street, Suite 1345 Seattle, WA 98122 RE: Use of Site at 4400 South 131st Place Dear Ms. Western: I wanted to confirm our conversation of January 26, 2000 regarding the use of property located at 4400 South 131St Place, in Tukwila. You have received permission to store equipment used for asphalt paving on the site until your building permit is approved (D99-0417). However, any vehicles stored on the site must be setback at least 50 feet from the edge of the buffer. In addition, no left over asphalt may be stored on the site until improvements are in place to prevent contamination of the wetland from any petroleum residue from the asphalt. I would appreciate it if you would relay this information to any of the work crews using the site. If you have any questions, please call me at 206-431-3661. Sincerely, aui Carol Lumb Associate Planner cc: Gary Schulz, Urban Environmentalist Jack Pace, Planning Manager Bruce Creager, AICP, Barghausen Engineering q:\cpl\Hot Mix Pavers\Westem.doc • 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206-431-3670 • Fax: 206-431-3665 .• PUBLIC WORKS PROJECT REVIEW COMMENTS Project Name:/l7t H/ IC ieiS Location: File#: D99- 047 Action: Date: 1/2 7 2600 Reviewed By: VOAMJIV#' 5 5it/c.&Q PRIOR HISTORY AND CORRESPONDENCE FRANCHISE UTILITY COORDINATION CODE REQUIREMENTS COMP PLAN CIP OVERLAY PROGRAM MISC. STUDIES MAINTENANCE NEEDS RFA WD 125 VAL-VUE PW STANDARDS PRE -APP PROBLEM AREAS 1.. REV15E PGAtN5 PEA RT79cH o "Ogg- uP 2.. APPLICANT Sfa.L O&'YM AN HPA PeeMir rgai P,sHeie/Es .ewi'O G/P6 role. 57t2giti 4,A76e- DAscHi9R6E - 70 1716 rt 4N0 /s reE»H ftT Tr/E NoI€ TH 6 W) 0 THE PR.OPpRTY; AND A IoSOOT pER/ ♦T, .SINCE 00E 571eER/'i /S 'NOIR /.JSDor JN,2IsDi c TT °'`I s. APPLICANT SH'Qll O8773/4 »A) HPA- /004eiteir P.R 0 >Y FISHEt /LS J G)//40L//E po,e .5To, ,4-C WA'7De Disc/1'9/265 /sc//'9R6 iv 71e FK/ST/i 4 5/4AL6, blitielf /s A' P'/.SH EAR.I AX 5 -77W09 -Ar/ .18 N 68Grrn /3/ so FZACE rI.iKs,m,A hive ee.-ouNO/n%G ()go/ NA 'c neniEs, AGC. UntiTI SMALL 8E PACED 1t/VOE126Ro V0 MVO 01/ 672/16690 tint/77E5 ALON6 FRONTASE 0") 6/31 pace 5rnUt; . 8E britoEEEtouA, SuBMiT f1' 5T gi UGHT/NG pc»N ,SHA,/NW poWeR Rz,Es EMOuED /}NO/O& RELOC47 O - DIVE 5 EEi G/4eT /S R,EQu -i i. iTH M O SERVICE � /9�1 SFi2 E C�6//VET� RErE� �'o � ,. o.T: INFRASTZucTuRE DES/6N . STIitl AeDS, CoNTFicr . MR. TEo. E,! P44)0#75"77a Mil/ fig- (206) ei33 •,86/ cae 5r725E7 UbMrs Redoui�� f z opo APPLitivvr sHAut t 3rn /N AN Rirgov �, ,416 coziA,ry M17 O INDw ire/g� WASTE FOE. D/SCM»ie6O CON,t)EcT%N P2011 Tuc& 14096y .1)404v11) P90 TO S9N/7A,ey 5/DE 567.06e. PLEASE CDNYAcr Mk ARNAilb J. C/RARD 1-Tnclifs4trat, h/asfe Zi v¢s►i,9a,*0.? at r2ct5) 263- 3o/2, • City of Tukwila John W Rants, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: Carol Lumb, Associate Planner FROM: Gary Schulz, Urban Environmentalist DATE: January 20, 2000 RE: Hot Mix Pavers #E98-0018, #D99-0417 - Technical Review. I have reviewed the current plan set, date stamped Received 11/18/99, including the related project information for the Hot Mix Pavers office/shop development. The project is .subject to sensitive area regulations and proposes a wetland buffer reduction. My review is focused on the "Buffer Planting Plan" (Sheet LB1) completed by Barghausen Consulting Engineers (11/8/99). My comments are listed below: A. Wetland Buffer Reduction/Enhancement Plan The buffer area is proposed for a 50 percent reduction because of past disturbance and limited vegetative cover. The approved conceptual plan (Wetland Resources, Inc. 1999) proposes to save existing native trees and shrubs while adding a more diverse native component. These trees and shrubs include willow, black cottonwood, and red alder. The buffer plan completed by Barghausen Consulting Engineers (11/8/99) is not consistent with the approved conceptual plan. Please revise the plan as follows: 1) "Regrading of old fill" will not be as extensive as shown on the plan. Existing native trees and shrubs will need to be flagged and preserved as part of the enhancement. This should be a Goal listed under the section titled "Concept". Grubbing will be necessary to remove non-native plants and to prepare the site for new plantings. 2) Because the buffer area is primarily old fill material, oversized planting pits will need to be dug to allow a topsoil amendment. 3) The landscape irrigation plan (Sheet L3) allows for a temporary, surface irrigation system in the buffer area. Due to the proximity of the permanent irrigation, it is more efficient to extend the watering into the buffer area as an automatic system instead of heavy "spot" watering. The timing of watering can then occur at night and likely be more efficient. 6300 Southcenter Boulevarc, Suite #100 • Tukwila, Washington 98188. • (206) 431-3670 • Fax- (206) 431-3665 • Hot Pavers Memo January 18, 2000 Page 2 4) Please check the proposed planting pallette in the Wetland Resources' report as it does not match the submitted planting plan. Replace Oregon myrtle with a native species common to the Puget Sound region. 5) The final plan needs to incorporate the Monitoring Program per the Wetland Resources' report. Maintenance and monitoring was recommended for five years. The bufffer planting plan notes seem to indicate only a two-year maintenance period. 6) If a buffer seed mix is necessary, a low grow mix is preferred. This mix could Mclude trefoil, clover, kinnikinnik, lupine or a low growth form of grass. I have included the comments that I provided in my first memo concerning the stormwater plan. 2. Stormwater The plan shows an underground detention vault that is being placed in an area that may not be needed for parking or other use for the development. If this is the situation, could the detention facility be an open pond that would include detention and water quality treatment? If a vault is used with oil/water separator, could the discharge be spread out to sheetflow through the buffer in the area shown as being piped directly to the wetland? This would likely increase the water quality treatment in area with new plantings and soil substrate. The result could provide about 50 feet of biofiltration. Please let me know if there are questions. Cc: Steve Lancaster, DCD Director Jack Pace, Planning Manager Joanna Spencer, Associate Engineer • Cizy of Tukwila Steven M.-. Mullet, Mayor Department of Community Development Steve Lancaster, Director PRELIMINARY REVIEW COMMENTS PLANNING DIVISION DATE: January 13, 2000 APPLICANT: Barghausen Engineers for Hot Mix Pavers RE: D99-0417, Building Permit for Office ADDRESS: 4400 South 131st Place The following comments/requirements are based on the SEPA determination, E99-0018, issued on December 8, 1999: 1. A structure to cover the stored asphalt is required to prevent storm water from flowing directly over the asphalt. A separate building permit is required for this structure. 2. A storm water pollution prevention plan must be submitted for review and approval. 3. The downspouts from the office/maintenance building must be tightlined to the storm drainage system. 4. The City's landscaping ordinance has been revised since the pre -application meeting with the applicant. The landscaping plan shall be revised to: a) include landscaping of the interior parking area as provided in TMC 18.52.035, items 3. and 4. (see attached Ordinance 1872); b) revise the front landscaping to conform with Type I landscaping requirements and the side landscaping to conform with Type II landscaping, as required by Ordinance 1872. On the current landscaping plan, there is an area along the southern edge of the building that is missing landscaping. In the area on-site between the edge of the 12.5 -foot landscape area and the building, please provide ground cover, such as kinnikinnick. Comments from the City's Urban Environmentalist are attached in a separate memo. Please be aware that you will probably receive comments and/or corrections from other City departments as well. When you re -submit your corrected plans for further review, your re -submittal must respond to the comments of all City departments concurrently. You will know when you have received the comments from all departments involved in the review and approval of your project when you receive a "Correction Letter" from the City's Permit Coordinator. The Permit Center cannot accept your re -submittal until 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: 206-431-3670 • Fax: 206-431-3665 D99-0417 Hot Mix Pavers after you have received a Correction Letter reflecting all departmental comments and corrections. In the meantime, if you have any questions regarding the Planning Division comments and corrections, please contact Carol Lumb at (206) 431-3661. If you have any other questions regarding the status of your permit application, please contact the Permit Center at (206) 431-3670. cc: Permit Center Reviewing Departments Enclosures: Ordinance 1872 Landscaping Plan 1/20/00 Memo from Gary Schulz 2 c:\carol\general\d99-0417.doc 12/20/99 10:13 FAX 425 649 7098 DEPT OF ECOLOGY Suggs, Sarah 2002 • •Cui ki '5... 2.1 CC., C0 8 c) Sus, Sarah Sent: Friday, December 17, 1999 1:33 PM To: 'slancaster@ci.tukwila.wa.us' Cc: 'gschulz@ci.tukwila_wa.us' Subject: SEPA #E99-018, Hot Mix Pavers, Ecology comments Hi Steve, thanks for calling me back today. Gary contacted me yesterday and we talked at length about this project. 1 hope that we can work to keep the communications open between our offices. I am forwarding you a weblink to the 303d list (1998, I believe) for the Cedar -Green Basin, so you will just need to scroll down to the "Duwamish Waterway and River' part. In addition, I am attaching a different format of the 303d list on MS Word. As I am sure you are well aware and as shown by the 303d fist, the Duwamish exceeds a myriad of water quality parameters already. This is why, especially in light of ESA issues, I strongly recommend that the City of Tukwila require the above applicant to abide by the City's recommended buffer widths for the resource in question. I do not believe that the applicant can adequately prove that by reducing the buffer to 25 feet, even with denser plantings, that this will serve to protect the water quality of receiving waters (Southgate Creek discharges into the Duwamish). The scientific literature on the effectiveness of buffer widths to protect various parameters definitely does not support a 25 -ft buffer (Castelle et ai.,1994). The proposed development is industrial/commercial, and would most likely contribute a significant number of pollutants to the drainage basin. Perhaps the applicant can remove the fill that currently lies within the 50 -ft buffer area and restore it to a functioning upland buffer instead of the denser planting/25-ft. proposal_ http://www_wa.00v/ecology/Wo/303d/wrias/wria9. pdf CedarGreen303d Ilss.doc Sarah Suggs, Wetland Specialist Department of Ecology. Northwest Regional Office 3190 160th Avenue SE Bellevue, WA 98008-5452 425-649-7124 / 425-649-7098 fx. A F F I D A V I T flNatice of Public Nearing 0 Notice. of Public Meeting aEoar d of Adj ust--nnt Agenda. Packet flEiaard of Packet P Lanning Packet • Appeals Agenda Commis s ion. Agenda Short Subdivision Agenda Packet OF D ISTRIBUT ION herebv declare that: Q Notice of Applicatio•.rz far Shareline Management Permit Shoreline Management Permit 1 Determination of Non -7. s icnif icance Mitigated Dete No nsignifi cane Determination a f and Scoping Nati nation • of. Significance ce 0 Notice of Action Q Official Notice y Other N_ \ynkck)rLS ,c --'7q se -cx\oc Pcoccs El Other - - Ce was mailed to each of the fallowing addresses on Name o f Pra j ect SQQA 14(T \.(X ()i; t -s File Number 49 - OQ S i mature • • CHECKLIST: ENVIRONMENTAL REVIEW/SHORELINE PERMIT MAILINGS ( ) U.S. ARMY CORPS OF ENGINEERS ( ) FEDERAL HIGHWAY ADMINISTRATION ( ) DEPT OF FISH & WILDLIFE OFFICE OF ARCHAEOLOGY TRANSPORTATION DEPARTMENT DEPT NATURAL RESOURCES OFFICE OF THE GOVERNOR ( ) DEPT OF COMM. TRADE & ECONOMIC DEV. (c?i"-DEPT. OF"FISHERIES"& WILDLIFE; FEDERAL AGENCIES ( ) ( ) U.S. ENVIRONMENTAL PROTECTION AGENCY U.S. DEPT OF H.U.D. WASHINGTON STATE AGENCIES K.C. PLANNING & COMMUNITY DEV. BOUNDARY REVIEW BOARD FIRE DISTRICT #11 FIRE DISTRICT #2 K.C. WATER POLLUTION CNTRL SEPA OFFCL ( ) TUKWILA SCHOOL DISTRICT c:4crTUKWI•LA:LIBRARIES, f - ( ) RENTON LIBRARY ( ) KENT LIBRARY ( ) CITY OF SEATTLE LIBRARY ( ) U S WEST ( SEAT LExGITTALIGHTit's (_ *G&P,eQUND ENERT '')HIGHLINE WATER DISTRICT ( ) SEATTLE WATER DEPARTMENT ( ) TCI CABLEVISION ( ) OLYMPIC PIPELINE KENT PLANNING DEPT TUKWILA CITY DEPARTMENTS: ( ) PUBLIC WORKS ( ) ( ) POLICE ( ) ( ) PLANNING ( ) ( ) PARKS & REC. ( ) (. ) CITY CLERK FIRE FINANCE BUILDING MAYOR • ( ) PUGET SOUND REGIONAL COUNCIL ( ) P.S. AIR POLLUTION CONTROL AGENCY ( ) ;SW,,K_C CHAMBER OF COMMERCE � (OT!INbIAN TRIBE C VfyIAN4ISE ( ) SEATTLE TIMES 07/09/98 C:WP51DATA\CHKLIST 1'jt/iiurtC..V;¢ck,24/ SI c5 nZ )leve.s t<e,Lar *Pr ASO 3 Z DEPT OF SOCIAL & HEALTH SERV. DEPT. OF ECOLOGY, SHORELIND DIV 8 EPA"DIVISINQG,WASAL OFFICE OF ATTORNEY GENERAL * SEND CHKLIST W/ DETERMINATIONS * SEND 1"171" -VPS WITH DECISION Imo+ 5N - - tu4.1- eat, KING COUNTY AGENCIES ( ) K.C. DEPT OF PARKS ( ) HEALTH DEPT ( ) PORT OF SEATTLE• (XLK:C.DEV.'&;ENVIR:'SERVICES=SEPA INFO CNTi4 ( ) K.C. TRANSIT DIVISION - SEPA OFFICIAL SCHOOLS/LIBRARIES HIGHLINE SCHOOL DISTRICT' K C PUBLIC LIBRARY • SEATTLE MUNI REF LIBRARY SEATTLE SCHOOL DISTRICT RENTON SCHOOL DISTRICT UTILITIES ( ) PUGET SOUND POWER & LIGHT ( ) VAL-VUE SEWER DISTRICT ( ) WATER DISTRICT,,#20 ( s:WATER7DISTRICT #15 ( ) CITY OF RENTON PUBLIC WORKS ( ) RAINIER VISTA ( ) SKYWAY CITY AGENCIES ( ) RENTON PLANNING DEPT ( ) CITY OF SEA -TAC ( ) CITY OF BURIEN ( ) TUKWILA PLANNING COMMISSION MEMBERS ( ) TUKWILA CITY COUNCIL MEMBERS ( ) CITY OF SEATTLE - SEPA INFO CENTER - DCLU ( ) SEATTLE OFFICE OF MGMNT & PLANNING* * NOTICE OF ALL SEATTLE RELATED PLNG PROJ. OTHER LOCAL AGENCIES METRO ENVIRONMENTAL PLANNING DIV. OFFICE/INDUSTRIAL 5,000 GSF OR MORE RESIDENTIAL 50 UNITS OR MORE RETAIL 30,000 GSF OR MORE t ta✓h Lav` 5i%1 14 44) .Q\'‘(')2%C 112,'Z t- Atte st T.0 . V)Du 3C,L `i 13415 -5p u.)4 al 8 c 2y <c.e,��tzz. ANITA WESTERN HOT MIX PAVERS 1122 E PIKE ST STE 1345 SEATTLE WA 98122 TUKWILA LIBRARY 14475 59TH AV S TUKWILA WA 98168 WATER DIST. #125 PO BOX 68147 SEATTLE WA 98168 LARRY SHAW NORMED PO BOX 3644 SEATTLE WA 98124 BRUCE CREAGER BARGHAUSEN ENGINEERS 1821572AVE S KENT WA 98032 PUGET SOUND ENERGY 22828 30TH AV S KENT WA 98032-1834 Smooth Feed Sheets"' • CALIFORNIA AVENUE CO PO Box 68726 Tukwila, WA 98168 Robert Sheehan 4522 S 133Rd St Tukwila, WA 98168 Use template for 5160® DMS INVESTMENTS LLC 4435 S 134Th P1 Tukwila, WA 98168 FORSTORIA PARK ASSOCIATES FORSTORIA P = ' . SSOCIATES Ben & Darryl Stark 4487 S 134Th P1 4487 S 1 ' 1 PO Box 98638 Tukwila, WA 98168 T .• WA 98168 Seattle, WA 98198 Daniel & Sally Sue Coleman 5506 Lakeview Dr #1 Kirkland, WA 98033 Frank Johnson 13136 Macadam Rd S. Tukwila, WA 98168 Jim Gayther 4404 S 133Rd St Tukwila, WA 98168 Daniel & Sall - oleman Jim Gwyther GATEWAY CORPORATE PROPS 5506 Dr #1 4404 S St 150 Almaden Blvd #700 WA 98033 T a, WA 98168 San Jose, CA 95113 Frank Johnson 13136 Macadam Rd S Tukwila, WA 98168 James & Barbara Guess 28020 201St Ave Se Kent, WA 98042 Lanny Cherie Yin & Ty Chith 4175 S 131St St Tukwila, WA 98168 ROUSU CONSTRUCTION 1NC PO Box 925 Woodinville, WA 98072 NORMED SHAW PARTNERSHI PO Box 3644 Seattle, WA 98124 Lauren Ahrty 13119 42Nd Ave S Tukwila, WA 98168 James Liljestrand & K B Diane 13111 42Nd Ave S Seattle, WA 98168 Iglesia Bautista Primera 13045 42Nd Ave Ne Seattle, WA 98125 Susan Bottorff 13031 42Nd Ave Ne Seattle, WA 98125 NORMED-SHAW P TNERSHI POBox3 , A 98124 SOUTH CENTRAL SCH DIST 40 13100 E Marginal Way S ,WA Helham & Natasha Ymeri 13103 42Nd Ave S Seattle, WA 98168 Iglesia Bau - ' rimera 1304 d Ave Ne e, WA 98125 Eugene Rinehart PO Box 23 Ocean Shores, WA 98569 NORMED-SHAW TNERSHI PO Bo e, WA 98124 NORMED-SHA . ' ARTNERSHI NORMED-S ARTNERSHI NORMED-SHAW PARTNERSHI PO Box 36 PO Bo POBox 3• Sea ' A 98124 e, WA 98124 S - , ' A 98124 AVERY® Address Labels Laser 5160® Smooth Feed SheetsTM • Shaw Ptn No PO Bo , WA 98124 Shaw Ptn ed POB 644 S e, WA 98124 Barry Becker 4446 S 131St St Tukwila, WA 98168 Timothy Hayes 2300 S 118Th St Seattle, WA 98168 NORMED S PARTNERSHI PO Box , WA 98124 Shaw Ptn ed PO 644 e, WA 98124 . 31St St a, WA 98168 SEATTLE SMSA LIMITED PRT PO Box 91211 Bellevue, WA 98009 Use template for 5160® Shaw Ptn Normed PO Bo S . e, WA 98124 NORMED S ' ARTNERSHI PO Bo S - . e, WA 98124 AVERY® Address Labels Laser 5160® CITY OF TUKWILA DEPARTMENT OF COMMUNITY DEVELOPMENT 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431-3670 AFFIDAVIT OF INSTALLATION AND POSTING OF PUBLIC INFORMATION SIGNS) State of Washington County of King City of Tukwila I C l-ro ( Lk) Mb (Print Name) understand that Section 18.104.110 of the Tukwila Municipal Code requires me to post the property no later than fourteen (14) days following the issuance of the Notice of Completeness. „114", S aPA- boevr o.;,,,„t I certify that on k2 -S - �� the Pu is Notice Board(s) in accordance with Section 18.104.110 and other applicable guidelines were poste on the property located at Liyo 0 5, 13 / s% °)&Cc_. so as to be clearly seen from each right -of -way providing primary vehicular access to the property for application file number -aq - 0,01g Affiant (Applicant Signature) SUBSCRIBED AND SWORN to before me this day of , 19 NOTARY PUBLIC in and for the State of Washington residing at My commission expires on • • CITY OF TUKWILA DETERMINATION OF NONSIGNIFICANCE (DNS) DESCRIPTION OF PROPOSAL: TO BUILD A 2,625 SF OFFICE/SHOP W/PKG & LNDSCPNG. THE PROPOSAL CONSISTS OF SITE PREPARATION AND PLAC EMENT OF APPROXIMATELY 500 CUBIC YARDS OF MATERIAL FOR THE FUTURE SITE DEVELOPMENT -OF 1 ACRE. 7•-13-94 PROPONENT: ANITA WESTERN LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY: ADDRESS: 4400 S 131 PL PARCEL NO: 734920-0220 SEC/TWN/RNG: LEAD AGENCY: CITY OF TUKWILA FILE NO: E99-0018 The City has determined that the proposal does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21c.030(2)(c). This decision was made after review of a completed environmental checklist and other information ori file with the lead agency. This information is available to the public on request. *************************************************************************** This determination is final and signed this _ day of (3eXawk.‘444-- 19941. - - Steve Lancaster, Responsible Official City of Tukwila, (206) 431-3670 6300 Southcenter Boulevard Tukwila, WA 98188 Copies of the procedures for SEPA appeals _are available with the Department of Community Development. City of Tukwila • • John W. Rants, Mayor Department of Com merit Steve Lancaster, Director December 6, 1999 To: Steve Lancaster, Director and SEPA Responsible Official Fm: Carol Lb, Associate Planner Re: SEPA: Hot Mix Pavers, (File No. E99-0018) Project Description: Construct a 2,625 square foot office and shop on a .99 acre site. The project also includes a 30,000 square foot paved asphalt equipment storage yard and parking area on the site. A Class 2 wetland is located on the eastern portion of the property. The applicant is requesting a reduction in the wetland buffer size from the required 50 feet to 25 feet and has provided a wetland enhancement plan as required by TMC 18.45. Proponent: Bruce Creager, Barghausen Engineering for Hot Mix Pavers Location: 4400 South 13151 Place Date checklist prepared: July 8, 1999 Lead Agency: City of Tukwila, Department of Community Development Challenges to Document: None Other Agencies of Jurisdiction: None Recommendation: 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 File E99-0018 Hot Mix Pavers SEPA Staff Report • • Determination of Non -Significance (DNS) Documents and Materials submitted with SEPA Checklist: 1. Wetland Delineation Report and Buffer Enhancement Plan, dated 7/12/99; prepared by Wetland Resources, Inc. 2. Traffic Impact Analysis, dated August, 1999; prepared by David Hamlin and Associates. 3. Property Survey, dated 4/24/89; prepared by Dennis Lund. 4. Project Plans: Grading and Storm Drainage Plan; Rough Grading and Temporary Erosion/Sedimentation Control Plan, dated September 10, 1999. 5. Preliminary Site Plan, revised 9/1/99; prepared by Barghausen Engineers. Comments to SEPA Checklist: Summary of Primary Impacts: Earth The site is generally flat, with a 50% side slope in the buffer area adjacent to the right-of-way for SR -599. The Wetland Delineation Report and Buffer Enhancement Plan describes the site as having been filled and graded and cites as evidence the virtually level topography and the limited growth of pioneer vegetation. The Report notes that near the eastern property boundary, the fill material drops steeply to a wetland area dominated by reed canarygrass. The Checklist states that the soils on the site are glacial till although the site appears to have had a great deal of fill placed on it years ago to create a level building site. No soils report was prepared for the site. It is likely that the soils underlying the fill are alluvium rather than glacial till. Approximately 500 cubic yards of grading will occur to re -grade the site prior to construction. Approximately 68% of the site will be covered with impervious surface. An erosion and sedimentation control plan has been submitted. The applicant is proposing to erect fabric filter fences around the perimeter of the site, a temporary construction entrance, and temporary "v" ditches with rock check dams that will direct surface water runoff to a temporary sediment trap. Air Dust and vehicular emission from construction is expected. Construction equipment will meet current emission standards; dust control will be provided during construction. Water q:\carol\hotmix\sepa-rpt.doc 2 File E99-0018 Hot Mix Pavers SEPA Staff Report • • The Checklist states that there are seasonal wetlands located on the northeast portion of the site, between the site and State Route 599. The Checklist states there is a drainage ditch across South 130 Place, approximately 75 feet from the site, which flows into the Duwamish River, a salmonid habitat. The "drainage ditch" is actually Southgate Creek, which flows along South 131st Place and then turns east and flows through the adjacent parcel, which is developed with an office/warehouse. Southgate Creek is considered a critical drainage area. A Wetland Delineation Report and Buffer Enhancement Plan was submitted evaluating the wetland and providing a buffer enhancement plan, as the applicant is requesting a reduction of the wetland buffer from 50 to 25 feet and has provided a wetland enhancement plan for review. The request for a buffer reduction is governed by the City's Sensitive Areas ordinance (TMC 18.45.040 C.4) and is an administrative decision by the Director of the Department of Community Development. The conceptual buffer enhancement plan demonstrates that the criteria for approval of a buffer reduction can be met for this project. A detailed planting plan will be required prior to final approval of the buffer reduction. The Wetland Delineation Report and Buffer Enhancement Plan states that the hydrology within the area appears to be supplied by a combination of run-off from the on-site fill and SR 599 to the east. The wetland extends offsite to the adjacent parcel on the north that is developed with an office/warehouse. The total wetland area, both on and off-site, is greater than one acre in size and the primary vegetation type is emergent. The wetland is located in a depressional area surrounded by historic fill associated with the adjacent roadways and existing on-site fill and grading. The Wetland Delineation Report and Buffer Enhancement Plan indicates that a significant amount of disturbance has occurred within the wetland in the past, as indicated by its uneven topography, location between two areas of historic fill and the dominance of reed canarygrass. The Wetland Delineation Report and Buffer Enhancement Plan provides the following assessment of the wetland values. Off-site portions of the wetland are within the 100 -year flood plain of Southgate Creek, which flows through the site adjacent on the north. The wetland has the potential to provide floodflow attenuation during large flood events. The wetland provides limited groundwater recharge because the soils underlying most of the wetland have low permeability, however the wetland does provide recharge to Southgate Creek and contributes a modest amount of hydrology to the Duwamish River. The Wetland Delineation Report and Buffer Enhancement Plan determines that the wetland has moderate potential for water quality improvement and limited potential to provide habitat for some wildlife species. No groundwater will be withdrawn to serve this project. Surface water runoff will be collected and treated according to the standards in the King County Surface Water Design Manual prior to discharge. The applicant will be asked to look at discharging treated stormwater so that it is spread out and the water quality treatment area would be increased. A storm drainage T.I.R. based on the King County Surface Water Design Manual was submitted with the SEPA application. The Notes and Details Sheet illustrates an Oil/Water Separator, however the q:\carol\hotmix\sepa-rpt.doc 3 File E99-0018 Hot Mix Pavers SEPA Staff Report • • drawings to not indicate where the oil/water separator is connected. Revised drawings will be required for the storm water permit. Any needed revisions to the T.I.R. will be addressed through the building permit application. One item that will need revision in the T.I. R. will be addressing the temporary storage of asphalt on- site. Through the City's Storm Water Management Ordinance, the applicant will be required to provide a storm water pollution prevention plan. This plan will address such issues as runoff from the stored asphalt pile and any surfactants that are used on equipment on-site. Through the Storm Water Management Ordinance the applicant will be required to construct a carport type structure to prevent water from falling directly on the asphalt pile. This structure may need to include wing walls to prevent water from blowing in from the sides. At the time of the building permit application , the applicant must submit a maintenance plan and schedule for the private storm drainage system. A separate permit will be required for the proposed underground vault. Downspouts from the office/shop building must connect directly to the storm drainage system rather than allowing water to sheet flow across the site to catch basins. Plants The Checklist indicates that the site contains shrubs and grasses. Plants indicating the presence of a wetland, such as reed canarygrass, are also located on the northeastern portion of the site. All on-site vegetation, outside of the wetland, will be removed. A landscaping plan will be required as part of the building permit for the site. In addition, a wetland enhancement plan as set forth in The Wetland Delineation Report and Buffer Enhancement Plan will be implemented, which will provide plantings for the wetland and buffer areas. Animals The Checklist does not indicate the presence of any birds or animals on or near the site. However, the Wetland Delineation Report and Buffer Enhancement Plan notes that crows, dark eyed juncos, black capped chickadees and song sparrows were observed on or near the site. In addition, salmon habitat exists downstream of the site in the Duwamish River. The site is located in the Pacific Northwest Flyway route of migratory waterfowl. The enhancement of the wetland and its buffer area will provide improved habitat for both migratory waterfowl as well as other wildlife. Energy/Natural Resources Electricity will be used for lighting and heating the office/shop building. The office/shop construction will conform to the most recent Uniform Building Code and Washington State energy code. Environmental Health Construction noise will be generated during the construction of the office/shop building. These noises would occur generally between the hours of 7:30 a.m. and q:\carol\hotmix\sepa-rpt.doc 4 File E99-0018 Hot Mix Pavers SEPA Staff Report • • 5:00 p.m., Monday through Saturday. Once construction is complete, then noise would be generated by the movement of machinery used for the asphalt paving business, which will be stored on the site when not in use. Environmental hazards from the project include exposure to shop chemicals such as diesel fuel or oil in the truck service area. Asphalt is not produced on the site, however leftover asphalt is stored on the site until needed for another job. According to the applicant, remaining asphalt is stockpiled in an area with ecology blocks surrounding the material to contain it. The applicant estimates that approximately 10-15 cubic yards of material is stored on the site. A backhoe is used to break up the cold asphalt material prior to its re -use. As noted above under the "Water" discussion, there will be requirements applied through the City's Storm Water Management Ordinance to address water quality concerns related to the storage of asphalt on the site. The Commercial/Light Industrial district does not permit on-site hazardous substance processing and handling unless clearly incidental and secondary to a permitted use. The Development Standards in the District require uses to comply with standards adopted by the Puget Sound Air Pollution Control Agency for odor, dust, smoke and other airborne pollutants, TMC 8.22 "Noise" and adopted State and Federal standards for water quality and hazardous materials. Land/Shoreline Uses The site is zoned Commercial/Light Industrial and is currently vacant. The site is bounded on the northeast by State Route 599, on the east by a general excavating contractor, on the south by South 13155 Place and on the west by a parcel developed with office/warehouse uses. There is a Class 2 wetland on the northeast side of the site, which extends into the adjacent office/warehouse. The proposed use, storage of construction equipment used for asphalt paving and related office and maintenance shops, is consistent with the zoning and the Comprehensive Plan designation of Commercial/Light Industrial. Housing Not applicable. Aesthetics Landscaping will be required on the front and sides of the proposed office/shop building and paved area for equipment. Design review of the project is not required by the zoning code. The tallest structure in the development will be approximately 21 feet high. The required landscaping will soften the project site. One comment was received on the SEPA application. The letter expressed concerns about the design of the office/maintenance building and setbacks of the building given the different nature of the proposed development from the adjacent office/warehouse development. As noted above, design review is not required for a project of this size. The required landscaping will soften the appearance of the site. The structures will be required to meet zoning code setbacks for the q:\carol\hotmix\sepa-rpt.doc 5 File E99-0018 Hot Mix Pavers SEPA Staff Report • • Commercial/Light Industrial district: front setback of 25 feet, side setback of 5 feet and rear setback of 5 feet. Twelve and one-half feet of landscaping are required on the front with five feet on the sides. No landscaping is required at the rear, however, the buffer enhancement at the rear of the site will improve the appearance of that area. Light/Glare Lighting for the proposed project will consist of shielded wall lighting and shielded parking lot lighting with non -glare fixtures and illuminated signs. The proposed project will reinforce the light industrial character of this area. Recreation Not applicable. Historic/Cultural Preservation There are no known historic and cultural sites or objects on or next to this site. Transportation The proposed project will be served by South 1315` Place and 44th Place South, a private road serving both this site and the adjacent office/warehouse. The applicant provided a Traffic Impact Analysis, prepared by David Hamlin and Associates. The proposed development will store construction equipment and serve as a base site for most of the company employees. One of the employees will be located on-site during the day typically from 9:00 a.m. to 4:30 p.m.; eight employees will report to the equipment site before 7:00 a.m. to park their cars and then leave with construction equipment to go to a job site. Two other employees will travel directly to the job site each day. The Traffic Impact Analysis states that 36 daily trips will be generated by this project, with almost all occurring during peak hours. The distribution of these trips will vary, depending on the location of the construction projects; the Traffic Impact Analysis estimates that 10% will go north, 15% southwest, 30% to the east and 45% to the southeast. Any traffic mitigation payments will be determined during the building permit process. The proposed project will provide a total of 13 parking stalls on-site, including one handicapped parking stall. The project will be required to install curb, gutter and sidewalk on South 131' Place as part of the building permit process. Transit service is available along either South 133rd Street or Interurban Avenue South. Four METRO bus routes, #34, 108, 124 and 129 loop through the Gateway Corporate Center at the intersection of S. 133`d Street and Interurban Avenue South, approximately one mile away. It is not anticipated that the proposed development will require additional transit service above what is currently available. q:\carol\hotmix\sepa-rpt.doc 6 File E99-0018 Hot Mix Pavers SEPA Staff Report • • Public Services The new development may generate an increased need for public services such as police service and possibly fire service, however, this increase can be accommodated by current service levels. Utilities Utilities currently available at the site include electric, natural gas, water, refuse service, telephone, storm water and sanitary sewer. The site is served by Water District 125, with sewer service provided by the City of Tukwila. No additional utilities are anticipated to be needed as a result of the proposed project. Recommendation Determination of Nonsignificance q:\carol\hotmix\sepa-rpt.doc 7 File E99-0018 Hot Mix Pavers SEPA Staff Report • • HOT MIX PAVERS REQUIREMENTS FROM EXISTING TUKWILA MUNICIPAL CODE The following items will be required of the applicant for Hot Mix Pavers as authorized or required by existing Tukwila Municipal Code. Required by the Sensitive Areas Ordinance or Land Altering Permit:.... 1. Implementation of the wetland and buffer enhancement plan including submittal of buffer planting plan. Required Through Storm Water Management Ordinance: 2. Revisions to Technical Information Report (TIR) based on requirements of King County Surface Water Design Manual including storage of asphalt on-site. A maintenance plan/schedule for the private storm drainage system is also required. 3. A storm water pollution prevention plan will be required. 4. A structure to cover the stored asphalt will be required to prevent storm water from flowing over the asphalt. 5. A separate permit is required for the underground vault. Calculations must be provided for sizing the vault along with structural calculations and plans. A geotechnical recommendation is needed for vault installation. Required Through Traffic Concurrency Ordinance: 6. Payment of pro -rata share of traffic impact fee based on Concurrency Ordinance. Required Through Zoning Code: 7. A landscaping plan for landscaping along the front and sides is required as part of the building permit submittal. q:\carol\hotmix\sepa-rpt.doc 8 MEMORANDUM. December 6, 1999 TO: Steve Lancaster, Director, Department of Community Development FM: Carol Lumb, Associate Planner RE: Request for Reduction in Type 2 Wetland Buffer The City is currently reviewing the SEPA application for Hot Mix Pavers, a proposed 2,625 sq. ft. office and shop on a .99 acre site located at 4400 South 131st Place. The project also includes a 30,000 sq. ft. paved asphalt equipment storage yard and parking area on the site. The site contains a Class 2 wetland on the eastern edge of the property and the applicant has requested a reduction of the required 50 foot buffer to 25 feet. This property is adjacent to NorMed on the south, and the wetland on this site continues onto the NorMed site. The applicant has submitted a conceptual buffer enhancement plan as required by TMC 18.45 and a letter addressing the criteria in TMC 18.45.040 C.4.a. "Variation of Standard or Creation of Variable Width Wetland/Watercourse Buffers." The letter is attached. Gary Schulz, the Department's Urban Environmentalist, has reviewed the conceptual enhancement plan and has recommended that the buffer reduction be approved with the permit contingent on the actual buffer enhancement planting plan (see attached memo, dated 10/28/99). If you agree with the recommendation to reduce the buffer width from 50 feet to 25 feet with the implementation of the buffer enhancement plan, please sign below. Approval of the buffer reduction request is a Type 2 decision. Appeal of this decision is to the Planning Commission and is processed pursuant to TMC 18.108.020. Steve Lancaster, Director Department of Community Development Attachments q:\carol\Hot Mix Pavers\buffer.doc Caroum - Re: of Mix Pavers From: Ryan Larson To: Carol Lumb Date: 11/23/99 9:54AM Subject: Re: Hot Mix Pavers Carol, I just talked to Lisa Austin of Ecology and the Hot Mix Pavers project will not require a NPDES permit. - Ryan »> Carol Lumb 11/19/99 12:20PM »> Thanks Ryan - my big concern is whether we have the regulations in our existing code to deal with anything we want to require of them, or whether I need to have a special SEPA condition to address water quality concerns from the asphalt. I talked initially with Lisa then got referred on to another person in Olympia who then referred me to a Ron Devit (sp?) at the Bellevue office who is a water quality inspector. He left me a really long message this morning while I was out and I want to call him back to follow up on some of what he said. Thanks again. »> Ryan Larson 11/19/99 08:19AM »> I will let you know something today. I am waiting on a call from Lisa Austin who has been out of the office but is due back this morning. - Ryan »> Carol Lumb 11/18/99 04:41PM »> Hi! Have you had a chance to review the materials Joanna gave you to see if there are any conditions I should apply through SEPA on the storage of small amounts of asphalt on the site??? I need to issue the SEPA soon, so would appreciate your input. Thanks. City of Tukwila 6200 Southcenter Boulevard • Tukwila, Washington 98188 MEMORANDUM TO• FROM• J0011114-, (206) 433-1800 v.vrE• it 02 . Q1 SUBJECT: Hat- M i x�� Tr c, roil; avifoils will bt d c ;,e4 ,J,,,,'i •�. S vkiss otter ' , T. i. R J.k.a tau KC% De sigivu is K u. 1' P , 1- C - is ' �,d,�t,�, ci,►,a., Q,�t,Q,, 1 'd i -- KA ,L, 211.,ict-, ca I. r 6 I 7Ak 44-- i2-LAtt- C- Kt( tti K� 1 0 j 1 of 01„,„‘,,5.y �a (� v s 1► 00•JAA.va., 5c.d U itt". 3� • City of Tukwila d John W Rants, Mayor Department of Community Development Steve Lancaster, Director MEMORANDUM TO: Carol Lumb, Associate Planner FROM: Gary Schulz, Urban Environmentalist DATE: October 28, 1999 RE: Hot Mix Pavers #E98-0018, SEPA and Technical Review. I have reviewed the current plan set, date stamped Received 9/13/99, including the related project information for the Hot Mix Pavers office/shop development. The project is subject to sensitive area regulations and is proposing a wetland buffer reduction. My comments are as follows: 1. SEPA Checklist Some information in the checklist may need to be clarified in the determination. First, even though the City's Sensitive Areas mapping is not entirely accurate Inventoried Wetland #20 is shown north of this site. Also, Southgate Creek is mapped to the north and west. The Creek is referred to as a ditch. Most of the site has been filled but the checklist states soils are comprised of "glacial drift". There is no soil data included. The underlying soils are most likely alluvium. The checklist should identify that salmon habitat exists directly downstream of the site. 2. Stormwater The plan shows an underground detention vault that is being placed in an area that may not be needed for parking or other use for the development. If this is the situation, could the detention facility be an open pond•that would include detention and water quality treatment? If a vault is used with oil/water separator, could the discharge be spread out to sheetflow through the buffer in the area shown as being piped directly to the wetland? This would likely increase the water quality treatment in area with new plantings and soil substrate. The result could provide about 50 feet of biofiltration. 6300 Southcenter Boulevard, Suite #100 o Tukwila, Washington 98188 ° (206) 431-3670 0 Fax (206) 431-3665 Hot Pavers Memo October 28, 1999 Page 2 3. Wetland Buffer Reduction/Enhancement The wetland boundary has been verified by a brief site visit and is generally the edge of old fill material. This buffer area is proposed for reduction because of past disturbance and limited vegetative cover. Buffer function including habitat value can be increased with enhancement. The conceptual plan proposes to save existing native trees and shrubs while adding a more diverse native component. I recommend the buffer reduction be approved but the permit will be contingent on the actual buffer enhancement planting plan. The plan should consider how stormwater is being discharged from the detention facility. Also, there will need to be soil amendments for new plants combined with excavation of old fill material where possible. Please let me know if there are questions. Cc: Steve Lancaster, DCD Director Jack Pace, Planning Manager Jill Mosqeda, Associate Engineer NorMed P.O. Box 3644 Seattle, WA 98124 1206) 242-8228 October 14, 1999 NorMed - Shaw Partnership Ms. Carol Lumb Associate Planner City of Tukwila --Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, Washington 98188 Dear Carol: RECEIVED OCT 19 1999 COMMUNITY DEVELOPMENT We understand that our new adjacent property owners, Hot Mix Pavers, are proposing to develop their property. As you are probably aware, we have tried to develop our property to a very high quality standard with quality materials, landscaping, and design. We'd obviously like to see this quality in adjacent projects. If this is not possible it would seem that landscape screening setbacks and similar buffers would help in separating dissimilar developments. Avoiding an overly wide building at the front of the property would also seem to establish more compatible developments. Hence we would appreciate your consideration of adequate front and side yard setbacks. Note that we own property on both sides of this development and are concerned about its impact in both directions. Thank you for your consideration. Sincerely, Otvi Lawrence M. Shaw Partner LMS/tle Immediate Care Medical Supplies Ms. Carol Lumb, Associate Planner City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES October 11, 1999 RECEIVED OCT 14 1999 DEVE OPMENT RE: Request for Reduction of Wetland Buffer Width for the Hot Mix Pavers Project 4400 South 131st Place, Tukwila, Washington City File No. E99-0018 / Our Job No. 7099 Dear Ms. Lumb: As discussed, we are writing to formally request a 50 percent reduction in the wetland buffer associated, with the Type 2 wetland buffer .on,the east.side:of.the Hot,Mix;Pavers• project.; This request is being made pursuant to City of Tukwila Municipal Code 18.45.040C.4. We request that this reduction in the buffer width from 50 feet to 25 feet be considered together with the SEPA environmental review currently underway by the City of Tukwila. Under prior submittals (July 13, 1999) we submitted a Wetland Delineation Report and Buffer Enhancement Plan prepared by Wetland Resources, Inc., and a SEPA environmental checklist, together with project plans. On September 10, 1999, we submitted revised Preliminary Site Plans and Grading, Drainage, and Temporary Erosion and Sedimentation Control Plans. Our request is that the City of Tukwila review the Wetland Resources, Inc., report, together with the most current sets of plans, and approve the wetland buffer reduction. The criteria which are required to be demonstrated are noted below, with brief responses supported by information documented in the plans and report referenced above: Criteria: "The Director may reduce the standard wetland/water course buffers on a case-by-case basis, provided the buffer does not contain slopes of 20 percent or greater." Our Response: The area that is the subject of the buffer width reduction has an overall slope of 6 percent. The 25 -foot buffer that would remain with the approval of the reduced buffer width contains "a short "run" of less than 10 feet, with a grade change of 2 to 3 feet, directly adjacent to the wetland boundary. Criteria: "Any buffer reduction proposal must demonstrate to the satisfaction of the Director that it .twill not result in direct or indirect, -short-term;or.long-term;adverse impacts to wetlands or water courses." 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX Ms. Carol Lumb, Associate Planner City of Tukwila Department of Community Development -2- October 11, 1999 Our Response: The existing area proposed for the buffer reduction is "...dominated by sparsely vegetated filled areas that provide little in terms of wildlife function"; and, "The wetland is located in a depressional area surrounded by historic fill associated with the adjacent roadways and existing on-site fill and grading. A significant amount of disturbance has occurred between the wetland in the past as indicated by its uneven topography, location between two areas of the historic fill, and dominance of reed canary grass. " (Wetland Resources, Inc., report dated July 12, 1999) Due to these current conditions, the existing buffer provides little functional value to the adjoining wetland. In fact, it is our opinion that the reduction of the buffer width by 50 percent, and significant enhancement through the buffer enhancement plan, will provide a far superior buffer function and value. Criteria: `If there is no significant vegetation in the buffer, a buffer may be reduced only if an 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 wetland or water course functions and values. " Our Response: The Wetland Resources, Inc., report proposes a buffer enhancement plan for the proposed 25 -foot buffer width, including a 60 percent coverage with trees 10 feet on -centers, and the remainder of the buffer area planted with shrubs 5 feet on -centers. Plant specimens are to be planted in accordance with the proposed plant palette in the Wetland Resources, Inc., report. Additionally, the wetland delineation report proposes a monitoring plan consisting of twice -yearly inspections for a period of five years with annual reports. The report also includes a maintenance schedule that includes removal of invasive species; criteria for success (e.g., survival of 80 percent of the plants within five years), a contingency plan, and performance bonding recommendations. The purpose of the reduction in the buffer width is to produce a site area that is adequate for the safe, secure and satisfactory operation of the Hot Mix Pavers business. The additional 2,500 square feet of pavement that is achieved by the reduction in the buffer width is equal to the area of the parking stalls and asphalt recycle bin that will be provided on the Hot Mix Pavers property. Without the approval of the reduction in the buffer width, the operation of the facility will be impacted. The site would then not be able to satisfactorily accommodate the fleet of employee parking, the fleet of Hot Mix Pavers equipment, the required maneuvering areas (for circulation into the storage yard and repair shop and parking stalls) and the recycle bin. It is likely that some of the employees would need to park their vehicles on the street, not on the property. Or, it would have a hardship for the trucks and trailers to circulate in the yard; and potentially impact the storage of equipment. One of the reasons Hot Mix Pavers needs this property is to develop a safe and secure site for the storage of their equipment and to avoid the theft and vandalism that is currently happening at their site in Seattle. • • Ms. Carol Lumb, Associate Planner City of Tukwila Department of Community Development October 11, 1999 Based on the information and documents supplied to the City of Tukwila, we respectfully request the buffer width reduction from 50 feet to 25 feet. Should you have any questions or comments, or need additional supporting documentation, please contact me at this office. Sincerely, Bruce K. -Creager, AICP Director of Planning Ser BKC/ca/mm 7099C.008 enc: As Noted cc: Ms. Anita Westeren, Hot Mix Pavers Mr. Scott Brainard, Wetland Resources, Inc. Mr. Hal P. Grubb, Barghausen Consulting Engineers, Inc. CITY OF TUKWILA DEPARTMENT OF COMMUNITY DEVELOPMENT 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206)431-3670 AFFIDAVIT OF INSTALLATION AND POSTI\ OF PUBLIC -F'ORVIATIO\ SIGN(S) State of Washington County of King City of Tukwila G I G ata 1 Lt/A (print Name) understand that Section 18.104.110 of the Tukwila Municipal Code requires me to post the property no later than fourteen (14) days following the-issuanceof the Notice of Completeness. I certify that on 10y O'i the Public Notice Board(s) in accordance with Section 18.104.110 and other applicable guidelines were posted on the property located at L#400 S 13/ so as to be clearly seen from each right -of -way providing primary vehicular access to the property for application file number e- 'M —o0 (8' Affiant (Applicant Signature) SUBSCRIBED AND SWORN to before me this day of , 19 NOTARY PUBLIC in and for the State of Washington residing at My commission expires on AFFIDAVIT 422ag/ Notice of Public Hearing Notice of Public Meeting Board of Packet Board of Packet Planning Packet Adjustirent Agenda Appeals Agenda Commission Agenda Short Subdivision Agenda Packet OF D I S T R I B U T I 0-N hereby declare that: Notice of, Application for Shoreline Management Permit Shoreline Management Permit Determination of Non- -significance. . Mitigated Detei.aaination of Nonsignificance JDetermination of Significance and Soaping Notice Notice of Action Official Notice 0-6ther d�7 /aC' Other mailed to each of the following addresses on /0/4" was Name of Project i.crr.ature File Number 4699 6)9/f • • CHECKLIST: ENVIRONMENTAL REVIEW/SHORELINE PERMIT MAILINGS ��') U.S. ARMY CORPS OF ENGINEERS ( ) FEDERAL HIGHWAY ADMINISTRATION ( ) DEPT OF FISH & WILDLIFE ✓✓ Uu-voN4 940Aw-t OFFICE OF ARCHAEOLOGY TRANSPORTATION DEPARTMENT DEPT NATURAL RESOURCES OFFICE OF THE GOVERNOR FEDERAL AGENCIES ( ) U.S. ENVIRONMENTAL PROTECTION AGENCY ( ) U.S. DEPT OF H.U.D. Sow WASHINGTON STATE AGENCIES (/) DEPT OF COMM. TRADE & ECONOMIC DEV. . '/A// DEPT OF FISHERIES & WILDLIFE K.C. PLANNING & COMMUNITY DEV. BOUNDARY REVIEW BOARD FIRE DISTRICT #11 FIRE DISTRICT #2 K.C. WATER POLLUTION CNTRL SEPA OFFCL TUKWILA SCHOOL DISTRICT TUKWILA LIBRARIES RENTON LIBRARY KENT LIBRARY CITY OF SEATTLE LIBRARY U S WEST SEATTLE CITY LIGHT ( ) PUGET SOUND ENERGY ( ) HIGHLINE WATER DISTRICT ( ) SEATTLE WATER DEPARTMENT (. ) TCI CABLEVISION ( ) OLYMPIC PIPELINE KENT PLANNING DEPT TUKWILA CITY DEPARTMENTS: ( ) PUBLIC WORKS ( ) POLICE ( ) PLANNING ( ) PARKS & REC. ( ) CITY CLERK ( ) ( ) ( ) ( ) FIRE FINANCE BUILDING MAYOR PUGET SOUND REGIONAL COUNCIL P.S. AIR POLLUTION CONTROL AGENCY SW K C CHAMBER OF COMMERCE MUCKLESHOOT INDIAN TRIBE DUWAMISH INDIAN TRIBE ( ) SEATTLE TIMES 07/09/98 C:WP51DATA\CHKLIST ( DEPT OF SOCIAL & HEALTH SERV. (-), DEPT OF ECOLOGY, SHORELIND DIV V DEPT OF ECOLOGY, SEPA DIVISIOtii--' ( ) OFFICE OF ATTORNEY GENERAL * SEND CHKLIST W/ DETERMINATIONS * SEND SITE MAPS WITH DECISION KING COUNTY AGENCIES ( ) K.C. DEPT OF PARKS J(//) HEALTH DEPT ),.PORT OF SEATTLE K.C.DEV & ENVIR SERVICES-SEPA INFO CNTR ( ) K.C. TRANSIT DIVISION - SEPA OFFICIAL SCHOOLS/LIBRARIES HIGHLINE SCHOOL DISTRICT K C PUBLIC LIBRARY SEATTLE MUNI REF LIBRARY SEATTLE SCHOOL DISTRICT RENTON SCHOOL DISTRICT UTILITIES ( ) PUGET SOUND POWER & LIGHT ( ) VAL-VUE SEWER DISTRICT (/) WATER DISTRICT #20 �`�,/ WATER DISTRICT #125 ( ) CITY OF RENTON PUBLIC WORKS ( ) RAINIER VISTA ( ) SKYWAY CITY AGENCIES RENTON PLANNING DEPT CITY OF SEA -TAC CITY OF BURIEN TUKWILA PLANNING COMMISSION MEMBERS TUKWILA CITY COUNCIL MEMBERS CITY OF SEATTLE - SEPA INFO CENTER - DCLU SEATTLE OFFICE OF MGMNT & PLANNING* * NOTICE OF ALL SEATTLE RELATED PLNG PROJ. OTHER LOCAL AGENCIES ( METRO ENVIRONMENTAL PLANNING DIV. OFFICE/INDUSTRIAL 5,000 GSF OR MORE RESIDENTIAL 50 UNITS OR MORE RETAIL 30,000 GSF OR MORE CA AaLl-• -riuuuum 1 ccu ..Iaccw CALIFORNIA AVENUE CO PO Box 68726 Tukwila, WA 98168 /i V3G ►�r111.r/►Y►a: ",. /a.vw • • Robert Sheehan 4522 S 133Rd St Tukwila, WA 98168 DMS INVESTMENTS LLC 4435 S 134Th P1 Tukwila, WA 98168 FORSTORIA PARK ASSOCIATES FORSTORIA P '. SSOCIATES Ben & Darryl Stark 4487 S 134Th P1 4487 S 1 ' 1 PO Box 98638 Tukwila, WA 98168 T .. WA 98168 Seattle, WA 98198 Daniel & Sally Sue Coleman 5506 Lakeview Dr #1 Kirkland, WA 98033 Dr #1 WA 98033 Frank Jo u i ! • .' 13136 Rd eman T ;a,WA98168 James & Barbara Guess 28020 201St Ave Se Kent, WA 98042 Lanny Cherie Yin & Ty Chith 4175 S 131St St Tukwila, WA 98168 ROUSU CONSTRUCTION INC PO Box 925 Woodinville, WA 98072 NORMED SHAW PARTNERSHI PO Box 3644 Seattle, WA 98124 Frank Johnson 13136 Macadam Rd S Tukwila, WA 98168 Jim Gayther 4404 S 133Rd St Tukwila, WA 98168 Jim Gayther GATEWAY CORPORATE PROPE 4404 S St 150 Almaden Blvd #700 T a, WA 98168 San Jose, CA 95113 Lauren Ahrty 13119 42Nd Ave S Tukwila, WA 98168 James Liljestrand & K B Diane 13111 42Nd Ave S Seattle, WA 98168 Iglesia Bautista Primera 13045 42Nd Ave Ne Seattle, WA 98125 Susan Bottorff 13031 42Nd Ave Ne Seattle, WA 98125 NORMED-SHAW P TNERSHI PO Box 36 , A 98124 SOUTH CENTRAL SCH DIST 40 13100E Marginal Way S ,WA Helham & Natasha Ymeri 13103 42Nd Ave S Seattle, WA 98168 Iglesia Bau 'rimera 1304 ' d Ave Ne e, WA 98125 Eugene Rinehart PO Box 23 Ocean Shores, WA 98569 NORMED-SHAW P TNERSHI PO Bo S e, WA 98124 NORMED-SHA ARTNERSHI NORMED-S ARTNERSHI NORMED-SHAW PARTNERSHI PO Box 36 PO Bo PO Box 3 Sea A 98124 Seatt e, WA 98124 S , ` A 98124 AVERY® Address Labels Laser 5160® .d II I ILl1 1 CCU ..uccw Shaw Ptn No PO Bo . 4 S- • WA 98124 Shaw Ptn ed POB 644 S e, WA 98124 Barry Becker 4446 S 131St St Tukwila, WA 98168 Timothy Hayes 2300 S 118Th St Seattle, WA 98168 IJ •GU/'IlY\G /V1 ....,. • • NORMED S PARTNERSHI Shaw Ptn Normed PO Box PO Bo - , WA 98124 S e, WA 98124 Shaw Ptn ed PO 644 Sea e, WA 98124 Barry 31St St a, WA 98168 SEATTLE SMSA LIMITED PRT PO Box 91211 Bellevue, WA 98009 Shaw Ptn No ed POB e, WA 98124 NORMED S ARTNERSHI PO Bo S e, WA 98124 AVERY® Address Labels Laser 5160® City of Tukwila John W. Rants, Mayor epartment of Community Development Steve Lancaster, Director NOTICE OF APPLICATION DATED October 4, 1999 The following application has been submitted to the City of Tukwila Department of Community Development for review and decision. APPLICANT: Bruce Creager, Barghausen Engineers for Hot Mix Pavers LOCATION: 4400 South 131st Place, Tukwila, WA FILE NUMBERS: E99-0018 Environmental Review PROPOSAL: Applicant is proposing to construct a 2,625 square foot office and shop on a .99 acre site. The project will also include a 30,000 sq. ft. asphalt paved equipment storage yard and parking area on the site. A Class 2 wetland is located on the eastern portion of the property. The applicant is requesting a reduction in the wetland buffer size from the required 50 feet to 25 feet. OTHER REQUIRED PERMITS: Land Altering, Storm Drainage, Tree Permit The file can be reviewed at the Department of Community Development, 6300 Southcenter Blvd., #100, Tukwila, WA. Please call (206) 431-3670 to ensure that the file will be available. OPPORTUNITY FOR PUBLIC COMMENT You can submit comments on this application. You must submit your comments in writing to the Department of Community Development by 5:00 p.m. on Monday, October 18, 1999. If you have questions about this proposal contact Carol Lumb, the Planner in charge of this file. Anyone who submits written comments will become a party of record and will be notified of any decision on this project. APPEALS You may request a copy of any decision by the Planning Director on this project or obtain information on your appeal rights by contacting the Department of Community Development at 431-3670. DATE OF APPLICATION: NOTICE OF COMPLETE APPLICATION: NOTICE OF APPLICATION POSTED: c:\carol\normed\notapp. doc July 13, 1999 September 27, 1999 October 4, 1999 6300 Southcenter Boulevard, Suite #100 o Tukwila, Washington 98188 ° (206) 431-3670 o Fax (206) 4313665 HOT MIX PAVERS E99-0018 09/27/1999 18:03 FAX 425 251 8782 BARGHAUSEN • CITY OF TUKWILA oepA wrM1F rr top f`oMMtfWf V faFVFLOPMT:Nt Zoos 6300 Seutheenter Boulevard. T,drku A., W.& nsiaa Trelephosso; (206) 43! 3670 AFFIDAVIT OF INSTALLATION AND POSTING OF PUBLIC INFORMATION SIGN(SRECEIVED OCT 0 41999 COMMUNITY DEVELOPMENT State of Washington Coway ofKing City of Tukwila I 0 a (Print Name) understand that Section 18.104.110 of the Tukwila Municipal Code requires we to poet the property no later than fourteen (14) days following the issuance of the Notice of Completeness. I certify that on ��- 0 - / 9 9 the Public Notice Board(s) in accordance with Section 18.10 110 and other applicable guidelines were posted on the property located at5 2 /3/G so as to be clearly seen from each right'=af-w+a±�''proviain primazy vehicular access to tl c ropcsty for application file number ,C 9 9- DDD/f _..... A Mori (Arr SUBSCRIBED AND SWORN to before me this .30 day of 19 veant Nignanrrrt) NOTARY PUBLIC in and for the State of Washington residing at �� i r C E My ctirizriissiori expues on Q • City of Tukwila Department of Community Development September 27, 1999 - NOTICE OF COMPLETE APPLICATION Bruce K. Creager, AICP Barghausen Engineers > 18215 72nd Avenue South > Kent, WA 98032> RE: Hot Mix Pavers: E99-0018 Dear <Mr. Creager: BY FACSIMILE John W. Rants, Mayor Steve Lancaster, Director Your application for Hot Mix Pavers located at 4400 South 131st Place, has been found to. be complete on September 27, 1999 for the purposes of meeting state mandated time requirements.' The next step is for you to install the notice board on the site within 14 daysof the date of this letter. You received information on how to prepare and install the sign with your application packet. If you need another set of those instructions, you may obtain them at the Department of Community Development (DCD). Also, you must obtain a laminated copy of the Notice of Application from this office to post on the board. Please call me 3 days prior to installing the notice board to arrange the pick up of the laminated Notice of Application. After installing the sign with the laminated notice, please return the signed Affidavit of Posting to this office. This determination of complete application does not preclude the City from requesting additional plans or information, if in our estimation such information is necessary to ensure the project meets the substantive requirements of the City or complete the review process. I will be contacting you soon to discuss this project. If you wish to speak to me sooner, feel free to call me at 431-3661. Sincerely, COW LX,(44,c/V— Carol" Lumb •Associate Planner cc: Reviewing City Departments c:\carol\hotmix\complete.doc 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington ' 98188 • (206) 431-3670 • Fax (206) 431=3665 HA 00 IG 91.0 -G ENG%N�F Ms. Carol Lumb, Associate Planner City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES September 27, 1999 RE: Request for Reduction of Wetland Buffer Width for the Hot Mix Pavers Project 4400 South 131st Place, Tukwila, Washington City File No. E99-0018 / Our Job No. 7099 Dear Ms. Lumb: RECEIVED SEP 2 8 1999 UNITY DEVELOPMENT As discussed, we are writing to formally request a 50 percent reduction in the wetland buffer associated with the Type 2 wetland buffer on the east side of the Hot Mix Pavers project. This request is being made pursuant to City of Tukwila Municipal Code 18.45.040C.4. We request that this reduction in the buffer width from 50 feet to 25 feet be considered together with the SEPA .environmental review currently underway by. the. City. of Tukwila. Undei..prior;submittals•`(July 13•, 1999) we submitted a Wetland Delineation Report_and Buffer Enhancement•Plan prepared by Wetland Resources, Inc. and a SEPA environmental checklist, :together, with project plans..; On September 10, 1999, 'we submitted revised Preliminary Site Plans and Grading, Drainage, and Temporary Erosion and Sedimentation Control Plans. Our request is that the City of Tukwila review the Wetland Resources, Inc., report, together with the most current sets of plans, and approve the wetland buffer reduction. The criteria which are required to be demonstrated are noted below, with brief responses supported by information documented in the plans and report referenced above: Criteria: "The Director may reduce the standard wetland/water course buffers on a case-by-case basis, provided the buffer does not contain slopes of 20 percent or greater." Our Response: The area that is the subject of the buffer width reduction has an overall slope of 6 percent. The 25 -foot buffer that would remain with the approval of the reduced buffer width contains a short "run" of less than 10 feet, with a grade change of 2 to 3 feet, directly adjacent to the wetland boundary. Criteria: "Any buffer reduction proposal must demonstrate to the satisfaction of the Director that it will not result in direct or indirect, short-term or long-term adverse impacts to wetlands or water courses." Our Response: The existing area proposed for the buffer reduction is "...dominated by sparsely vegetated filled areas, that provide little in terms. of wildlife *action"; and "The.wetland is.located in a: depressional area surrounded, by-.historic,fill associated with the.adjacent. roadways:and existing on-site fill and grading. A significant. amount of disturbance has•occurred between•'the'wetland in the . 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX www.barghausen.com Ms. Carol Lumb, Associate Planner City of Tukwila Department of Community Development -2- September 27, 1999 past as indicated by its uneven topography, location between two areas of the historic fill, and dominance of reed canary grass." (Wetland Resources, Inc., report dated July 12, 1999) Due to these current conditions, the existing buffer provides little functional value to the adjoining wetland. In fact, it is our opinion that the reduction of the buffer width by 50 percent, and significant enhancement through the buffer enhancement plan, will provide a far superior buffer function and value. Criteria: "If there is no significant vegetation in the buffer, a buffer may be reduced only if an enhancement plan is provided. The plan must include using a variety of native vegetation that improves the functional attributes of the buffer and provides a4ditional: protection for the wetland or water course functions and values." Our Response: The Wetland Resources, Inc., report proposes a buffer enhancement plan for the proposed 25 -foot buffer width, including a 60 percent coverage with trees 10 feet on -centers, and the remainder of the buffer area planted with shrubs 5 feet on -centers. Plant specimens are to be planted in accordance with the proposed plant palette in the Wetland Resources, Inc., report. Additionally, the wetland delineation report proposes a monitoring plan consisting of twice -yearly inspections for a period of five years with annual reports. The report also includes a maintenance schedule that includes removal of invasive species; criteria for success (e.g., survival of 80 percent of the plants within five years), a contingency plan, and performance bonding recommendations. Based on the information and documents supplied to the City of Tukwila, we respectfully request the buffer width reduction from 50 feet to 25 feet. Should you have any questions or comments, or need additional supporting documentation, please contact me at this office. Sincerely, nice K. Creager, AICP Director of Planning S•..+f'es BKC/sm/ca 7099C.008 enc: As Noted cc: Ms. Anita Westeren, Hot Mix Pavers Mr. Scott Brainard, Wetland Resources, Inc. Mr. Hal P. Grubb, Barghausen Consulting Engineers, Inc. Ms. Carol Lum, Associate Planner City of Tukwila Department of Community Development 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES September 10, 1999 asoinveo en OF TUKWILA SEP 1 3 1999 PERMIT CENTER RE: Hot Mix Pavers Project, 4400 South 131st Place, Tukwila, Washington City File No. E99-0018 / Our Job No. 7099 Dear Ms. Lum: As requested, we have revised our plans and prepared additional documents for the environmental review of the above -referenced Hot Mix Pavers project. Enclosed are the following documents: 1. Six copies of the Preliminary Site Plan, revised January 1, 1999. 2. Four copies of the Traffic Impact Analysis prepared by David I. Hamlin & Associates. 3. Four copies each of the Boundary and Topographic Surveys dated April 28, 1989 and April 24, 1989. 4. Four sets of the Grading, Drainage Plan, and Temporary Erosion/Sedimentation Control Plan, and notes and detail sheets. 5. Four copies of the Technical Information Report prepared by Barghausen Consulting Engineers, Inc., dated September 7, 1999, The Traffic Impact Analysis concluded a nominal amount of traffic being generated by the proposed Hot Mix Pavers facility. The total daily trip generation is 36 trips, with an estimated 16 peaks during the a.m. and 17 trips during the p.m. peaks. Based on the distribution analysis, we are proposing to pay mitigation fees for trips traveling through the intersection of South 133rd Street/SR-599 ramps, as described on page 6 of the Traffic Impact Analysis. Please review the enclosed documents for technical completeness and proceed with processing the Environmental Review Application. Should you need any further information, please contact me at this office. Sincerely, Bruce K. Creager, AICP Director of Planning es BKC/jss 7099C.007 enc: As Noted cc: Ms. Anita Westeren, Hot Mix Pavers Mr. Hal P. Grubb, Barghausen Consulting Engineers, Inc. 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX (EXPIRES 10/10400 I ¢GHA OUR JOB NO. 7099 SEPTEMBER 7, 1999 Prepared By: BARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251-6222 2 al CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES G g, August 9, 1999 City of Tukwila John W. Rants, Mayor Department of Community Development Steve Lancaster, Director NOTICE OF INCOMPLETE APPLICATION Bruce K. Creager, Barghausen Consulting Engineers 18215 72nd Avenue South Kent, WA 98032 RE: Hot Mix Pavers: E99-0018 BY FACSIMILE Dear Mr. Creager: Your application for environmental review for Hot Mix Pavers, proposed to be located at 4400 South 131x` Street has been found to be incomplete. In order to complete the application, the following must be submitted to the permit center: a. please revise the site plan as noted on the attached marked -up plan; b. a traffic analysis/trip generation and distribution analysis for ADT, morning, noon and afternoon peak trips must be submitted. The analysis should include driveway turning movements and sight distance for the private vacated road. ✓ c. the original boundary and topographic survey dated 4/28/89 and 4/24/89 must be submitted; ✓d. a storm drainage plan based on the requirements of the King County Surface Water Design Manual with core and special requirements addressed. The storm water plan should address whether equipment storage and other site operations/uses on this property require special water quality treatment due to proximity to fish bearing waters of Southgate Creek. e. while not a completeness issue, please be aware that the Preliminary Site Plan indicates "Approximate Wetland Boundary" for the wetland on-site. The Site Plan must be revised to accurately delineate the wetland and buffer boundaries. Items b and d noted above, were identified at the Pre -Application meeting on March 11, 1999 as being needed for review of this project. Upon receipt of these items, the City will re -review them for completeness and will mail you written notification of completeness or incompleteness within 14 days. These applications will expire if we do not receive the additional information within ninety days of the date of this letter unless an extension is granted pursuant to Section 18.105.070(E). h.3(Y) Snuthcenter Boulevard. Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 • Mr. Bruce Creager Barghausen Engineers August 9, 1999 Page 2 If you have any questions please call me at 431-3661 or Joanna Spencer at 433-0179. Sincerely, Carol Lumb Associate Planner cc: Reviewing City Departments Mr. Bruce Creager Barghausen Engineers _ August 9, 1999 Page 2 • If you have any questions please call me at 431-3661 or Joanna Spencer at 433-0179. Sincerely, u2/14c 9(Q/i/Puv Carol Lumb Associate Planner cc: Reviewing City Departments. • gigot-oo(g ENVIRONMENTAL CHECKLIST Purpose of Checklist: The State Environmental Policy Act (SEPA), chapter 43.21 RCW, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal (and to reduce or avoid impacts from your proposal, if it can be done) and to help the agency decide whether an EIS is required. Instructions for Applicants: This environmental checklist asks you to describe some basic information about your proposal. The city uses this checklist to determine whether the environmental impacts of your proposals are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise information known, or give the best description you can. You must answer each question accurately and carefully, to the best of your knowledge. In most cases you should be able to answer the questions from your own observations or project plans without the need to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write "do not know" or "does not apply." Complete answers to the questions now may avoid unnecessary delays later. Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations. Answer these questions if you can. If you have problems, the City staff can assist you. The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposals or its environmental effects. The City may ask you to explain your answers or provide additional information reasonably related to determining if there may be significant adverse impact. Use of Checklist for Nonproject Proposals: Nonproject proposals refer to actions which are different or broader than a single site specific development project, such as plans, policies and programs. Complete this checklist for nonproject proposals, even though questions may be answered "does not apply." In addition, complete the Supplemental Sheet for Nonproject Actions (Part D). For nonproject actions, the references in the checklist to the words "project," "applicant," and "property or site" should be read as "proposal," "proposer," and "affected geographic area," respectively. RECEIVED CITY OF TUKWILA J U L 1 3 1'99 PERMIT CENTER u3ipt,\ • eqcctY RECEIVED CITY OF TUKWILA SEP 1 3 1999 PERMIT CENTER TRAFFIC IMPACT ANALYSIS HOT MIX PAVERS FACILITY TUKWILA, WASHINGTON August 1999 Prepared for: Hot Mix Pavers DAVID I. HAMLIN AND ASSOCIATES 1319 DEXTER AVENUE NORTH - SUITE 270 SEATTLE WASHINGTON 98109 (206) 285-9035 TRAFFIC IMPACT ANALYSIS HOT MIX PAVERS FACILITY TUKWILA, WASHINGTON The purpose of this report is to review and analyze current conditions in the vicinity of the site, review the proposed ' development and the impacts to the transportation system, and develop the appropriate mitigation as necessary. The City has requested that a trip generation/distribution be provided for the daily, morning, noon, and afternoon trips, along with a review of the driveway sight distance and driveway turning movements. The listing of arterial intersections impacted by 5 or more peak hour trips will also be included. PROJECT DESCRIPTION The proposed project is for the development of a construction equipment storage yard on a site just over one acre in size. A support building with a shop space and a small office area ' to handle administration/paperwork will be constructed along the front of the site, adjacent to S. 131st Place. The site will be fenced for security purposes and the protection of ' the construction equipment. The business operation currently is located in Seattle, and will function similarly to its current operation, i.e., one staff person will work on-site, ' with the remaining employees working in the field at various job sites. A vicinity map of the area is shown on Figure 1. The site is located on the northeasterly side of S. 131st ' Place, on the west side of SR -599, just north of the S. 133rd Street ramps, and is currently an unoccupied, fenced parcel that is flat and vegetated with grass. The property is zoned ' "C/LI", commercial light industrial, which allows the proposed use. The adjacent land use consists of a small contracting business and a small business park. ' The remainder of this analysis will summarize the traffic - related impacts that can be expected on the adjacent intersections from the development of this site. A reduced copy of the site plan is shown in the Appendix. ADJACENT TRANSPORTATION ,SYSTEM ' 8. 131st Place/44th Avenue South is striped for two lanes and extends to the northeast from S. 133rd Street. Little to no ' shoulder exists, and open ditches are present along some sections of the street. The adjacent land use includes undeveloped parcels and light industrial uses. with narrow shoulders. The posted speed is 30 mph and the adjacent lane use is primarily light industrial. A traffic signal controls the intersection of S. 133rd Street/ Interurban Avenue. TRIP GENERATION The proposed development will store construction equipment P and serve as a base site for most of the company employees. ' The company has a total of 11 employees. One of these employees will be located on-site during the day, typically from 9:00 AM to 4:30 PM. Of the remaining 10 construction ' employees, two will not come to the equipment site, but will travel directly to the job site each day. The remaining eight employees will report to the equipment site before 7:00 ' AM to park their cars, and immediately leave with construction equipment to a job site. These employees return Figure 2 shows the estimated trip distribution by percent and daily volume for the subject site based on the information ' provided by the project proponent. It should be noted that these values are approximate and may vary from day to day depending on the job site locations for any given day. Figures 3, 4, and 5 show the trip assignment to the various streets during the AM, noon, and PM peak hours for the site. It can be seen from these figures that the impacts from the project will be fairly limited to the immediate area due to the good access to the freeway system. No level of service analyses were completed for this project per correspondence between the project's representative and ' the City. (Most of the major intersections in the City have improvement projects planned based on future traffic growth projections and analyses, so further analysis would be ' redundant. A mitigation fee will be assessed for those project improvements impacted by the project with 5 or more ' • • peak hour trips.) SITE ACCESS The construction equipment storage site will construct two LOCATION S. 133rd Street/ SR -599 SB Ramps S. 133rd Street/ Interurban Avenue SR -599 NB Off -Ramp/ Interurban Avenue I-5 SB Off -Ramp/ Interurban Avenue PEAK HOUR TRIPS 14 AM trips 15 PM trips 12 AM trips 7 PM trips 9 AM trips 7 PM trips 4 AM trips 5 PM trips The City of Tukwila has indicated that a mitigation fee may apply at the S. 133rd Street ramps as mitigation for this project. MITIGATION The following are suggested as potential mitigation measures for the proposed development. 1. Construction of frontage improvements along S. 131st Place as noted on the site plan. 2. Payment of a "per trip" fee of $81 through the intersection of S. 133rd Street/SR-599 Ramps if required by the City. The project will generate 15 PM peak hour trips through the intersection for a total of $1215. • APPENDIX PRELIMINARY SITE PLAN Etf uweMi SETBACK 566.3 PRNATE ROAD,. (VACATED RUTH ST ) XV 6' BCC Sava SAm �iij nA I 15, I LEGEND. 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'sr , '4,'� q ` $ ea .3 • t 5181. � � 1?:;,, IA7ERNATIOHAL .�ly r+. W �� v 1 Pianj:.O r s .l �� l,. 1 Ix rnw!4f l'_ ;'l'•: ,. �:: ,. ��1. "/ T(/K , ®I®. / N�. .•- -,,��, . Sp1TNCENTER - ,. �, !%•* 1 - .- .. ...f•, -?\:.: ;.r . _1am i, S-` $ 1< :.f .,,i.:;'..:',:.x,:ST- DAVID I. HAMLIN & ASSOCIATES PROJECT VICINITY MAP FIGURE 1 HOT MIX PAVERS FACILITY PAGE F-1 • • NORTH PROJECT SITE 30% 11 ESTIMATED TRIP DISTRIBUTION (BY PERCENT & DAILY VOLUME) FIGURE 2 DAVID I. HAMLIN & ASSOCIATES HOT MIX PAVERS FACILITY PAGE F-2 NORTH PROJECT SITE ESTIMATED AM PEAK HOUR TRIP ASSIGNMENT FIGURE 3 DAVID I. HAMLIN & ASSOCIATES HOT MIX PAVERS FACILITY PAGE F-3 NORTH PROJECT SITE ESTIMATED NOON PEAK HOUR TRIP ASSIGNMENT DAVID I. HAMLIN & ASSOCIATES FIGURE 4 HOT MIX PAVERS FACILITY PAGE F-4 • • NORTH PROJECT SITE ESTIMATED PM PEAK HOUR TRIP ASSIGNMENT FIGURE 5 DAVID I. HAMLIN & ASSOCIATES HOT MIX PAVERS FACILITY PAGE F-5 NORTH XX - AM PEAK HOUR TRIPS (XX) - PM PEAK HOUR TRIPS NOTE: NO NOON TRIPS ESTIMATED AM & PM PEAK HOUR TRIPS AT SITE ACCESSES FIGURE 6 DAVID I. HAMLIN & ASSOCIATES HOT MIX PAVERS FACILITY PAGE F-6 Planning Department City of Tukwila 6200 Southcenter Boulevard Tukwila, WA 98188 RE: Environmental Review 4400 South 131st Place Tukwila, Washington Our Job No. 7099 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES July 13, 1999 Courier Delivery On behalf of the Hot Mix Pavers, Inc., we are requesting the City's review of the Environmental Checklist, for the above -referenced site. The proposal consists of site preparation and placement of approximately 500 cubic yards of materials for the future site development on 1 acre. The project consists of the development at the intersection of South 131st Place and 44th Avenue South. The project will include the construction of 2,625 square feet of office/shop with associated parking (13 stalls) and landscaping in accordance with the City of Tukwila standards. Enclosed are the following documents, which comprise a complete SEPA Environmental Review Application: 1. Six copies of the completed and signed environmental checklist. 2. Six copies of the Site Plan (at original drawing size). 3: Site Plan (reduced to not larger than 8 1/2- x 11 -inch size). 4. Four copies of the Wetland Delineation Report. 5. One copy of the checklist application. 6. One set of mailing labels for all properties within 500 feet. 7. One check in the amount of $325 payable to the City of Tukwila. Please review the enclosed documents for technical completeness. Thank you for your prompt attention to this application. Respectfully, Alexia Inigues Assistant Planner AI/ph 7099C.002 enc: As Noted cc: Anita Westeren, Hot Mix Pavers, Inc. Hal P. Grubb, Barghausen Consulting Engineers, Inc. Bruce K. Creager, Barghausen Consulting Engineers, Inc. RECEIVED CITY OF TUKWILA J U L 1 3 1999 PERMIT CENTER 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX Wet/aHdN'ehlrce$,/Hc • . 644-cott Delineation / Mitigation / Restoration / Habitat Creation / Permit Assistance i 9505 19th Avenue S.E. Suite 106 Everett, Washington 98208 (425) 337-3174 Fax (425) 337-3045 WETLAND DELINEATION REPORT AND BUFFER ENHANCEMENT PLAN FOR HOT MIX PAVERS TUKWILA, WA WETLAND RESOURCES, INC. PROJECT #99123 Prepared By: Wetland Resources, Inc. 9505 19th Street SE, Suite 106 Everett, WA 98208 (425) 337-3174 for Hot Mix Pavers Attn: Anita Westeren 1122 East Pike St., Suite 1345 Seattle, WA 98122 July 12, 1999 RECEIVED CITY OF TUKWILA JUL 131999 PERMIT CENTER PROJECT SITE DESCRIPTION A site investigation was completed by Wetland Resources, Inc., in June of 1999 to locate jurisdictional wetlands on the Hot Mix Pavers site. This approximate one acre site is located west of SR 599, east of 42nd Ave. South, and South of 130th St in Tukwila, Washington. The property is located in the northeast portion of Section 15, Township 23 North, Range 5 East, W.M. No structures are currently present on the site. To the north and south existing light office/warehouse and commercial land use operations are occurring. Historically the site has been filled and graded as evidenced by virtually level topography and the limited growth of pioneer vegetation. Near the eastern property boundary the fill material drops steeply to a wetland area dominated by reed canarygrass. Hydrology within this area appears to be supplied by a combination of run-off from the on-site fill material and SR 599 to the east. Himalayan blackberry and Scot's broom dominate fill side slopes. An emergent wetland lies between SR 599 and the filled portion of the site and extends off-site to the north. The total wetland area (on and off-site) is greater than one acre in size and the primary vegetation type (greater than.30 percent coverage) is emergent. The wetland is located in a depressional area surrounded by historic fill associated with the adjacent roadways and existing on-site fill and grading. A significant amount of disturbance has occurred within the wetland in the past as indicated by its uneven topography, location between two areas of historic fill, and dominance of reed canarygrass. TMC 18.45.020 classifies wetlands with the aforementioned characteristics as Type 2 wetlands. The City of Tukwila typically designates 50 foot buffers adjacent to Type 2 wetlands. BUFFER ENHANCEMENT PLAN As part of the development proposal a 50 percent buffer reduction is proposed along the entire length of the wetland buffer. Currently this portion of the buffer is dominated by sparsely vegetated filled areas that provide little in terms of wildlife function. As mitigation for this reduction, the remaining portion of the wetland buffer along the western edge of the wetland will be enhanced through the removal of exotic, invasive vegetation, followed by planting several species of native trees and shrubs. Prior to planting, all invasive plants within the enhancement area, namely Himalayan blackberry, Scot's broom, and reed canarygrass, are to be removed, including both the above ground and below ground portions. Existing native trees and shrubs will remain. The minimum proposed buffer width is 25 feet. Plantings are to be arranged in a random fashion so as to best resemble natural establishment. 60 percent of the total enhancement area will be planted with trees on 10 foot centers, 40 percent will be planted with shrubs on 5 .foot centers. Please refer to the Mitigation Plan Map for the proposed location of the buffer enhancement area. Listed below are the species, sizes, spacings and numbers as planting specifications for this area: Common Name Red alder Douglas fir Western hemlock Big -leaf maple Bitter cherry Vine maple Osoberry Red elderberry Oregon grape Swordfern • • Latin Name Alnus rubra Pseudotsuga menziesii Tsuga heterophylla Acer macrophyllum Prunus emarginata Acer circinatum Oemleria cerasiformis Sambucus racemosa Berberis nervosa Polystichum munitum Plant Size Spacing Numbers 2 gal 10' 5 2 gal 10' 5 2 gal 10' 5 2 gal 10' 5 2 gal 10' 5 1 gal 5' 15 1 gal 5' 15 1 gal 5' 15 1 gal 5' 10 i gal 5' 10 ENVIRONMENTAL GOALS AND OBJECTIVES The goal of this buffer enhancement plan is to enhance the existing resource function of the wetland/buffer system located on the subject property. System benefits will include: • Enhanced Wildlife Habitat • Improved Water Quality • Improved. Wetland Protection • A minimum 80% survival of the planted species with a maximum of 25% invasives is considered a base line for a successful determination for this mitigation project. PROJECT MONITORING PROGRAM Requirements for monitoring project: 1. Initial compliance report 2. Yearly site inspections (twice yearly, spring and late summer / early fall) for five years 3. Annual reports (one report submitted in the fall of each monitored year) The purpose for monitoring this buffer enhancement project shall be to evaluate the success of the mitigation. Specific elements of monitoring include evaluating plant survival, and control of invasive species. Success will be determined if monitoring shows that at the end of five years, the definitions of success stated below are being met and that habitat functions and values in the buffer enhancement areas are equivalent to similar ecosystems in the immediate area. The property owner(s) shall grant access to the mitigation areas for inspection and maintenance to the contracted wetland specialist and to the City of Tukwila during the period of the assurance device, or until the project is evaluated as successful. Maintenance - The mitigation areas shall be maintained in April and June of each year for the five year monitoring period. Maintenance of invasive species will be essential for successful completion of this mitigation project. Maintenance shall include, but not be limited to, the removal of competing grasses and non-native vegetation (by hand if necessary), fertilization (if necessary), replacement of plant mortality, and the 2 • • replacement of mulch for each maintenance period. It is likely that irrigation will be necessary within the buffer enhancement area. Criteria For Success: Upon completion of the mitigation project, an inspection by Wetland Resources, Inc. will be made to determine plan compliance. A compliance report will be supplied to the City of Tukwila within 30 days after the completion of planting. Condition monitoring of the plantings and wildlife usage will be done by a qualified wetland biologist twice annually. A written report describing the monitoring results shall be submitted to the City of Tukwila once yearly in the fall of each monitored year. Final inspection shall occur five years after completion of this project. The approved wetland inspector shall prepare a report as to the success of the project. Definition of Success: Vegetation - The mitigation areas shall support at least 80% survival of the native plants set forth in the approved Buffer Enhancement Plan by the end of five years. Permanent transects and permanent photo site locations will be established for this monitoring project. The species mix should resemble that proposed in the planting plans, but strict adherence to obtaining all of the species shall not be a criteria for success. Minor species substitution will be allowed with approval by the City of Tukwila's Urban Environmentalist and the Consulting Biologist. By the end of the third growing season, the percent coverage, defined by total coverage of planted as well as existing and volunteer native species, shall be 80% for all areas. If an area contains more than 25% exotic species (non-native species) then the mitigation shall not be considered successful for that area. Wildlife - Bird, mammal, amphibian and fish diversity and abundance will be an indicator of wildlife habitat diversity. Species density and abundance shall be comparable to that found in similar stream/upland areas in the immediate vicinity. Published results from other wildlife studies in the region may be used. Visual surveys are sufficient. PROJECT NOTES Plant in the early spring or late fall, preferably during a period of significant precipitation. Order plants from a reputable nursery. Care and handling of plant materials is extremely important to the overall success of the project. All plant materials recommended in this plan should be available from local and regional sources, depending on seasonal demand. Some limited species substitution may be allowed, only with the agreement of the consulting wetland specialist. Each planting hole shall be over -excavated by 100% of the root ball size, horizontally around the root ball, and to a depth equal to the height from the bottom of the root ball to the root collar, and backfilled with native soil material. 3 • • Wood chips or shavings (composted mulch) shall be used for mulching in all planting areas. All existing vegetation is to be removed from a two foot diameter area at each planting site. Wood chips/shavings (composted mulch) are to be placed in this two foot diameter area at a depth of six inches with a two inch spacing around the base of the leader/stems of trees and shrubs. One and one half foot by two inch by 1/4 inch lath stakes shall be placed next to each tree and shrub planted to assist in locating the plants while removing the competing non- native vegetation and to assist in monitoring the plantings. There will be pre- and post -construction meetings on-site between the applicant, consulting wetland specialist, equipment operator(s), and City Biologist. A certified wetland specialist shall be present to inspect the plants prior to planting. Minor adjustments to the original design may be required prior to and during construction. CONTINGENCY PLAN If during any of the inspections, 20% of the plants are severely stressed, or it appears 20% may not survive, additional plantings of the same species may be added to the planting area. If this situation persists into the next inspection, a meeting with the City of Tukwila, the consulting wetland biologist, and the property owner will be scheduled to decide upon contingency plans. Elements of a contingency plan may include, but will not be limited to: more aggressive weed control, mulching, replanting with larger plant material, species substitution, fertilization, soil amendments, and/or irrigation, and reevaluation of species mix. GROUND COVER SEEDING All areas of disturbance and creation shall be seeded to the certified ground cover seed mixtures listed below. Similar native seed mixes are acceptable, upon approval of the consulting wetland professional. Due to sensitivity of the surrounding systems, fertilizer shall not be used. If deemed necessary by the consulting wetland professional and/or the City Biologist, a fertilizer such as 10-20-20 shall be applied at 400 pounds per acre. BUFFER GRASS SEED MIXTURE Common Name Scientific Name lbs. per acre lbs per 1,000 s.f. Redtop Agrostis gigantea 38 0.8 Perennial ryegrass Lolium perenne 36 0.6 Alaska brome Bromus sitchensis 16 0.4 Red Clover Trifolium pratense 16 0.4 4 • PERFORMANCE BONDING A performance bond for the planted species shall be provided to the City of Tukwila for the period of five years from the completion of the project, in an amount to be determined by the City of Tukwila. This bond shall be released at the end of five years, upon a "successful determination" and approval by the City of Tukwila for all portions of this mitigation project. The definitions of success shall be as described under PROJECT MONITORING PROGRAM on this plan. TOTAL QUANTITY OF 2 GALLON PLANTS 25 TOTAL QUANTITY OF 1 GALLON PLANTS 65 ESTIMATED COST OF MATERIAL AND LABOR $1,000.00 ESTIMATED COST OF MONITORING (3 YEARS $1,500.00 WETLAND CLASSIFICATIONS - COWARDIN SYSTEM According to the Cowardin System, as described in Classification of Wetlands and Deepwater Habitats of the United States, the on-site wetland, stream, and relic ditches are classified as follows. Wetland: Palustrine, Emergent Wetland, Persistent, Seasonally Flooded. WETLAND CLASSIFICATIONS - CITY OF TUKWILA Under the City of Tukwila Zoning Code, 18.45, the on-site wetland and stream are classified as follows. On-site Wetland Type 2 Wetland: This wetland is greater than one acre in size and is dominated by emergent vegetation. Type 2 Wetlands are designated 50 foot protective buffers from their flagged boundaries. WETLAND DETERMINATION REPORT Methodology On site, routine methodology as described in the Washington State Wetlands Identification and Delineation Manual (Washington State Department of Ecology Publication #96-94, March 1997), was used for this determination, as required by Tukwila during the permitting process. Under this method, the process for making a wetland determination is based on three sequential steps: 5 1) Examination of the site for hydrophytic vegetation (species present and percentage cover). 2) If hydrophytic vegetation is found, then the presence of hydric soils is determined. 3) Determination of the presence of wetland hydrology in the area examined under the first two steps. Vegetation Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydrophytic vegetation as the sum total of macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation produce permanently or periodically saturated soils of sufficient duration to exert a controlling influence on the plant species present. One of the most common indicators for hydrophytic vegetation is when more than 50 percent of a plant community consists of species rated "Facultative" and wetter on lists of plant species that occur in wetlands. Soil Criteria and Mapped Description The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydric soils as those that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part. Field indicators are used for determining whether a given soil meets the definition and criteria for hydric soils. The soils underlying the site are were not mapped in the Soil Survey of King County Area Washington because of limited work conducted by the Soil Conservation Service in the more urban areas of King County. Hydrology Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, states that "areas which are seasonally inundated and/or saturated to the surface for a consecutive number of days greater than or equal to 12.5% of the growing season are wetlands, provided the soil and vegetation parameters are met. Areas inundated or saturated between 5 and 12.5% of the growing season in most years may or may not be wetlands. Areas saturated to the surface for less than 5% of the growing season are non - wetlands." Field indicators are used for determining whether wetland hydrology parameters are met. Boundary Determination Findings On-site Wetland: The on-site wetland dominated mainly by emergent vegetation with the exception of small patches of native pioneer species on the northern property boundary. Emergent 6 • • vegetation is comprised almost entirely of reed canarygrass (Phalaris arundinacea, FacW). The patches of pioneer shrubs and sapling trees are dominated by red alder (Alnus rubra, Fac), black cottonwood (Populus balsamifera, FacW), and willows (Salix, sp., Fac-FacW). The dominance of species rated "facultative" and wetter indicates that a hydrophytic vegetation community is present in the areas mapped as wetland. The soils within the wetland area are dark gray (10YR 2/1) in color from the surface to greater than eighteen inches below. The soils were saturated at the time of investigation and an organic silt loam in texture. It appears that the area mapped as wetland is flooded, ponded, or saturated long enough during the growing season to develop anaerobic conditions in the upper part of the soils. The majority of the on-site wetland area was saturated to, or very near, the surface at the time of investigation. The wetland area appears to be saturated to the surface for a consecutive number of days greater than or equal to 12.5% of the growing season, thereby meeting the criteria for wetland hydrology. It appears that vegetation, soil, and hydrologic criteria are all met for the on-site portion of this wetland. Non -Wetland Areas: Vegetation in the non -wetland portions of the property is dominated mainly by Himalayan blackberry (Rubus discolor, FacU), Scot's broom (Cytisus scoparius, NI), and sapling black cottonwood (Populus balsamifera, FacW). The lack of dominance of species rated "facultative" and wetter indicates that a hydrophytic vegetation community is not present in the areas mapped as non -wetland. The soils in the non -wetland portions of the site are colored dark grayish brown (10YR 4/2) from the surface to eighteen inches below. No, to very few, redoximorphic features were identified. Due to the depth and compaction of fill material on much of the site, soil color and textures were difficult to obtain. The profile was slightly moist to dry at the time of investigation. Soils sampled in the areas mapped as non -wetland do not appear to be flooded, ponded, or saturated long enough during the growing season to develop anaerobic conditions in the upper part, and therefore do not appear to meet wetland soils criteria. There were no surface indicators of saturation or inundation in the non -wetland areas. It appears that the areas mapped as non -wetland are not saturated for a period greater than 5% of the growing season and therefore do not meet the wetland hydrology criteria. Because direct hydrologic indicators are lacking, and neither hydric soils nor hydrophytic vegetation dominated in these areas, it appears that these areas do not meet criteria for wetlands. 7 • • WETLAND FUNCTIONS AND VALUES Methodology The methodology for this functions and values assessment is based on professional opinion developed through past field analyses and interpretation. This assessment pertains specifically to the on-site wetlands, but is typical for assessments of similar systems common to Western Washington. Functions and Values Components Wetlands in Western Washington perform a variety of ecosystem functions. Included among the most important functions provided by wetlands are stormwater control, water quality improvement, fish and wildlife habitat, aesthetic value, recreational opportunities, and education. The most commonly assessed functions and their descriptions are listed below. Assessments of these functions for the project site are provided in the "Analysis" section of this report. Stormwater Storage/Floodflow Attenuation Wetlands often function as natural water storage areas during periods of precipitation and flooding. By storing water that otherwise might be channeled into open flow systems, wetlands can attenuate or modify potentially damaging effects of storm events, reducing erosion and peak flows to downstream systems. Additionally, the soils underlying wetlands are often less permeable, providing long-term storage of stormwater or floodflow and controlling baseflows of downstream systems. Stormwater storage capacity and floodflow attenuation are generally a function of the size of the wetland and their topographic characteristics. Water Quality Surface water quality improvement is another evaluated function. Surface runoff during periods of precipitation increases the potential for sediments and pollutants to enter surface water. Wetlands improve water quality by acting as filters as water passes through them, trapping sediments and pollutants from surface water. Ponded areas within depressional wetlands also allow sediments to drop out of suspension, thereby improving water quality. As development increases, the potential for polluted water to reach wetlands and streams also increases. Unnaturally high inputs of pollutants, which are often found in urbanized areas, along with the size of the wetlands and the vegetation structure within them are the main limiting factors of this function. Wildlife Habitat Wetlands have potential to provide diverse habitat for aquatic, terrestrial, and avian species for nesting, rearing, resting, cover, and foraging. Wildlife species are commonly dependent upon a variety of intermingled habitat types, including wetlands, adjacent uplands, large bodies of water, and movement corridors between them. Human intrusion, including development within and adjacent to 8 • • wetlands, and impacts to movement corridors are the most limiting factors for wildlife habitat functions. Analysis On-site Wetland Stormwater Storage/Floodflow Attenuation Off-site portions of the wetland are within the 100 year floodplain of the Southgate Creek. The wetland has potential to provide floodflow attenuation during large flood events as well as slowing stormwater moving into this drainage. It provides limited groundwater recharge because the soils underlying most of the wetland have low permeability. The wetland provides recharge to Southgate Creek and contributes a modest amount of hydrology to the Duwamish River. Water Quality The on-site wetland has the potential to provide water quality improvement functions prior to water entering the downstream watershed. The emergent vegetation within the wetland provides a high level of nutrient uptake, but is limited in the settling of suspended solids. Overall this system has a moderate potential for water quality improvement based on its location in a developed watershed. Wildlife Habitat The on-site wetland and its buffer have limited potential to provide habitat for some wildlife species such as birds and small mammals. The presence of forested areas near the wetland contributes to the wildlife habitat potential of this wetland. WILDLIFE The following species of wildlife were observed on site during the site investigation: common crow (Corvus brachyrhynchos), dark -eyed junco (Junco oreganus), black - capped chickadee (Parus atricapillus), and song sparrow (Melospiza melodia). Many more avian species are expected to inhabit the area during the breeding season. A variety of amphibians are expected to use the wetland and Southgate Creek. No mammals were observed during our site investigation, however, a variety of mammals are expected to use the site. USE OF THIS REPORT This Critical Area Study is supplied to the Hot Mix Pavers as a means of determining on- site wetland conditions, as required by the City of Tukwila during the permitting process. This report is based largely on readily observable conditions and to a lesser extent, on readily ascertainable conditions. No attempt has been made to determine hidden or 9 • • concealed conditions. Reports may be adversely affected due to the physical condition of the site and the difficulty of access, which may lead to observation or probing difficulties. The laws applicable to wetlands are subject to varying interpretations and may be changed at any time by the courts or legislative bodies. This report is intended to provide information deemed relevant in the applicant's attempt to comply with the laws now in effect. The work for this report has conformed to the standard of care employed by wetland ecologists. No other representation or warranty is made concerning the work or this report and any implied representation or warranty is disclaimed. Wetland Resources, Inc. Cott Brainard Senior Wetland Ecologist 10 • • BIBLIOGRAPHY Cooke, S. S. 1996. Wetland and Buffer Functions Semi -Quantitative Assessment Methodology. Cooke Scientific Services, Seattle, Washington. 29 pp. Cowardin, L. M., et al. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish & Wildlife Service Biological Services Program, Resource Publication 79/31. 103 pp. Franklin, J. F., and Dyrness, C. T. 1969. Vegetation of Oregon & Washington. U.S.D.A. Forest Service, Research Paper PNW-80. 216 pp. Kusler, J. A. et al. 1990. Wetland Creation and Restoration — The Status of the Science. Island Press, Washington, D.C. 594 pp. Mader, S. S. 1985. Biology: Evolution, Diversity, and the Environment. Wm. C Brown Publishers, Dubuque, Iowa. 809 pp. 11 • • Field Data Sheet 99123 Hot Mix Pavers Investigation Date: 6/2/99 Pit Depth Texture Color Moisture Species % Status Strata S1 0"- 8" orgsil 10YR 4/2 sat. at surface Phalaris arundinacea 100 FacW herb Wetland w/ motts 10 YR 5/8 8"- 20" orgsil 10YR 4/1 w/ motts 10YR 5/8 Conclusion: Wetland - Parameters for hydric soils, wetland hydrology and hydrophytic vegetation are met. S2 0"- 8" sil 10YR 3/2 moist Rubus discolor 60 FacU shrub Non- 10YR 5/8 Phalaris arundinacea 30 FacW herb Wetland 8"- 20" sil 10YR 4/2 moist 10YR 5/8 Conclusion: Non -Wetland - Parameters for hydrophytic vegetation, hydric soils, and wetland hydrology are not met. 12 • WETLAND DELINEATION REPORT AND BUFFER REDUCTION PLAN HOT MIX PAVERS SEG. 15, TWP 23.N, RGE 4E, W.M. BUFFER REDUCTION 4,245 SQ. FT. 4 a s — -- --- -- - - _J._ �M1 0 Scale 1" = 50' ,Wet/A`Hd17esoHtt s,//fO Qee8neatwn Mltleatwn y Rnatr.atwn 1 Hahltat treathn / Permit A. • 0305 19th Avenue S.E Sults 106 Eyerott,WinhIngtort 98206 Phone(426) 887-5174 Fax (425) 887-3046 mull - wetlendelhateyoneom ince 50 75 100 WETLAND DELINEATION REPORT HOT MIX PAVERS Tukwdo, Washington Hat Mt.c Po..ers Sheet 1.•1 Attr[ Anita Wcstcren Jab d 99123 1122 East Pike St., Drown by: S. Brainard Suite 1345 Cote: July 12, 1999 Seattle, WA 98122 Revision CITY TUKWILA 1 Department of Community Development 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431-3670 ENVIRONMENTAL REVIEW (SEPA) APPLICATION To submit for SEPA review, provide the items listed above to the Planning Division at 6300 Southcenter Boulevard, Room 100. Okr 6 copies of the completed and signed environmental checklist. You may use the City's pre-printed form or you may re -type the questions on your computer. If you choose to re -type the form into your computer, be sure to do so accurately. Mistakes or omissions will increase the review time. It 6 sets of the full size plans needed to clearly describe the proposed action. RiTo One set of plans reduced to 8.5" x 11". Four copies of supporting studies. J,UL 1 3 1.999 One copy of the checklist application. One set of mailing labels for all properties 500' from the subject property. (See address label worksheet.) $325 filing fee. RECEIVED CITY OF TUKWILA PERMIT CENTER COMPLETING THE CHECKLIST The checklist contains several pages of questions which you are asked to answer. It covers a comprehensive set of topics. As a result, several of the questions may not apply to your project. If a particular question does not apply, simply write N/A undemeath. HOWEVER, be aware that many questions apply despite appearing not to. Care needs to be taken in reading and answering the questions to ensure the appropriate response is provided. It is important that accurate and clear information be provided. You may not know all of the, answers. Answer each question to the best of your ability. If we find an answer to be insufficient, the City may contact you to ask for more information. Sometimes, after reviewing the checklist, the City will ask you provide additional studies or information. Commonly requested information includes traffic analysis, site topography, soils studies and tree surveys. CITY O•TUKWILA • Department of Community Development 6300 Southcenter Boulevard, Tukwila, WA 98188 Telephone: (206) 431-3670 SEPA APPLICATION CHECKLIST FOR STAFFUSE.ONLY` Planner: • Receipt Number:. File Number: ell:—. 00'8 Cross-reference files: v Applicant notified: of.incomplete-application: :Applicant' notified.of-complete; appl ication:: Notice of application issued:. A. NAME OF PROJECT/DEVELOPMENT: 14o+ Mix Pavers Inc. B. LOCATION OF PROJECT/DEVELOPMENT: (address and accessors parcel number(s)) LI LI s. 13T1 L. Tp, L Lal t\Jos, %Li 3612,0 - 0220-5 -022B -0230 d- -0136 Quarter: Section: Township: Range: (This information may be found on your tax statement) C. ` PROJECT DESCRIPTION: sii-e Prppa.vadien ctld cons -frac -hart 0-C a tneJ 211025 5,-P. ofh ce. and shop 5 jxtGe, j' Thai build, HAL CtitUbj T7puc,(. & . CITY O ' TUKWILA Departmen f Community. Development Building Division - Permit Center 6300 Southcenter Boulevard, Suite 100 Tukwila, WA 98188 Phone: (206)431-3670 Pre Application Checklist ;1 F. (1 1.1 i s `,, vif fg �11Qift! I�e$fV� �n'Sdi ..,i, �i • 4 w R Ite�irigDatafiic� Tifiie: • PRt3 "O.j 3 .f t. .L3'411-99,..0 3:30: pm . Site;Address• • '. Project!Name: Hot Mix Pavers 4400 S 131: PI The following comments are based on a preliminary review. Additional information may be needed. Other requirements/regulations may need to be met. PUBLIC WORKS DEPARTMENT Apply for and obtain the following permits/approvals through the City's Permit Center: (1 Channelization/Striping/Signing ❑ Sewer Main Extension (private) Curb Cut/Access/Sidewalk Land Altering CruT.Ptip Cu,rbo'OF,P FILL - Fire loop/Hydrant (main to vault) ❑ Flood Zone Control Hauling (2,000 Bond, Cert of Ins) Landscape Irrigation ❑ Moving an Oversized Load Sanitary Side Sewer. DOGVA jE.a.'o' IF Rt;+ILDIW, Fr<.rN [) Sewer Main Extension (public) Storm Drainage Pee KIt'JG iu Water Main Extension (private) ❑ Water Main Extension (public) ❑ Water Meter (exempt) ,S Water Meter (permanent) ❑ Water Meter (temporary) ® Other: U.Nrpff . ,C',Ut.t.NOtru/,. KLEf) &VPi.rES-F2iw'M- :,HA'u- S th /LF/} C-1 besiWAAL-, c,N Nf}lJ TEe ►a Nti 14 OA AL. P- 012.1) rt/A-NC E_ P/ i.rNQrnc,RA►tri)b. V2. Hauling Permit required prior to start of any hauling of material on public right-of-way ($2,000 bond, $1,000,000 certificate of insurance, route map and $25.00 permit fee required). 3. All applications and plan submittals must be complete in order to be accepted by the Permit Center for plan review. ;,Use the Plan Submittal Checklist provided on the reverse of the application forms to verify that all the necessary materials and information has been supplied. 4. Water and sewer assessments may apply and will be determined during the utility plan review process. V5. 6. Provide Hydrological -Geotechnical analysis. 7. Provide erosion control plan as part of grading/fill permit application. - 6H0 2 ►= r `,C" ;u`.t-a_s 8. Identify building elevation above 100 year.flood elevation per FIRM maps (use NGVD datum and recognizec benchmarks). PT-OJEcr SH»t P/)2r/GiPATE /A/ /33 ' ) AND OFF - ,i' Hip /M/-'eouzA4ENr 9. Provide a traffic analysis/trip generation study -far i D •D/STRi/3/47"/OAU FO,- /41)% 4 /1 Moor) 02,444 r, /7 -5 Ce -2&) n C 7' MF 6 /3'G Y BpA� VETT 5E N/ o iC, E Ni: /Nc E6• - O,� rE-�.vJ"MENr e (206) ¢3 3 --O /7"1 Fox -MO col'E 'i ' i p, SJZf c) y E_V, -LL 4-r 4,e/u,E"W/4 y rLA, WA) ' 10. .,Ilrovide developers agreement for: FOLLOW COJD/T,oAI OF 4-7779c/`/EQ ,D,i=s 11. Provide the following easements and maintenance agreements: Provide sidewalks per Ordinance Nos. 1158, 1217, and 1233, er-ebt-wai�Cr. Few -writ /MPh arM>cW /2F -C2'1): CAtke3 c urrzc, :51)t-ok 3r,Nr3 -rla6. Posste&E FN/ KD/?ID !-J/Ag,v//JG / /f- Soc /'9 TED 5'tri4C 1 p'C4 /,v4c;r pA! / 3, ;JE 12. . Provide water/sewer availability letters or certificates from.districts serving your development. 13. Obtain King County Water and Land Resources Industrial Waste Program for a Waste Discharge penrt#-ef approval (2-06-6-89-3969) r�o,i��r Me 2�-,�/ uQ 60211/'.A N,OirSi�f'///L /;1461-,17,1 to v ,; r le; /9 'Tt�R q /242) e `? -- 9' METS Pius/i' 5 Eci lbe./4-77o/) / r� too; CUGC wry Moiv:-R Esro,E/vnrrc SELJ�ip ItSF_ GP—�T�F�c� r/v�cJ rrEMtZiive, ,4i' ' IVEt-J L'LLGM/3//d6 Lr icl/ice /s ,CEC2i1 ip_E,3 \d,Wu5t.doC 3/4/99 . • PUBLIC WORKS DEPARTMENT Pre -Application Checklist File No.: PRE99-013 Page 2 of 2 14. . Complete Business Declaration (attached) and return to King County (self addressed and stamp provided). 15. Review the following City studies when designing your project and preparing your plan submittal: .16. Sv;2M ,80AiIv4cc . Y// . A).0" . w/coeE s,E��i�tt. ;tamp. /}pOtLF_ SSFrJ , . S/6/VY,L? TV CHECe- /Pi-fEul r 5777496E 4-,u6 onic'Q s/7 15E5,aauJee 5/4A-P- PEci'G LJd2t- 4''TY .7 N12e,-nt-rEr e! / pd&—/1 J/ry 17. i EA.eiA/- 1-.),FrE25 or .Sou 7-ievire eleFEK /4-431)-13 riSH 18. CUe-oQ l N /-t'% 7v FH GV 5 0 0 T" ieEQ %-et EL t=o f= 0� Ft OW w -nor ,OIZA(A)46E L),TCra )N Pi.44a-A/1 (�EfLI11�gS , s;�f'!-u_ -1?• Annt'..E'.& o 19. 20. airy4:04ce :0,ftielo .u.C, re- d, U' 51 -for Le hcZ`lc; yr ,t-cr i --Y14) 6ie JOI13(k Pelc; 1'J. /All I scalae requues a permit ana rack storage over t5 nlgn must oe designed for 5elsmlc Lone 3. A Washington State structural engineers stamp will be required on plans and structural calculations submitted for rack storage over 8' high. 1.1.. ,Construction documents shall include special inspection requirements as specified in UBC Section,106.3.5 and 1701. The architect or engineer's inspection program required by Section 106.3.5 shall be included with plan submittal documents when permit application is submitted. Notify the Building Official of testing lab hired by architect or owner prior to permit issuance date. The contractor may not hire the testing lab. n12. Structural observation shall be required as specified in UBC Section 1702. kdrdbldgllsl.doc 3/4/99 • . Control No. Epic File No. Fee _ _ Receipt No. CITY OF TUKWILA ENVIRONMENTAL CHECKLIST OUR JOB NO. 7099 A. BACKGROUND INFORMATION 1. Name of proposed project, if applicable: Hot Mix Pavers Inc. 2. Name of Applicant: Hot Mix Pavers Inc. c/o Barghausen Consulting Engineers, Inc. 3. Address and phone number of applicant and contact person: Anita Westeren Hot Mix Pavers Inc. 1122 East Pike Street, Suite 1345 Seattle, WA 98122 Telephone: (206) 324-0106 Contact: Bruce K. Creager 18215 - 72j d Avenue South Kent, WA 98032 Telephone: (425) 251-6222 4. Date checklist prepared: June 1999 5. Agency requesting checklist: City of Tukwila 6. Proposed timing or schedule (including phasing, if applicable): Upon issuance of the SEPA determination and associated building permits, construction will commence. The construction of the development of the site will take approximately one month. Page 1 of 19 7099.001 [AEI/sm] • • 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. None associated with the proposal. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Wetland Evaluation Report by Wetland Resources, Inc. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None to our knowledge. 10. List any government approvals or permits that will be needed for your proposal. The following is a list of governmental approvals or permits that will be necessary for the construction of this proposal: Local Agencies: City of Tukwila • Commercial Building Permit • Site Development Permit • Storm Drainage and Grading Plan Approval • Landscape Plan Approval • Approval of Wetland Buffer Reduction • Street Frontage Improvement Plan Approval 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. Section E requires a complete description of the objectives and alternatives of your proposal. and should not be summarized here. The proposal includes the site preparation and the construction of a new one-story, 2,625 -square foot metal office/shop building. The project will also include a 30,000 -square foot asphalt paved equipment storage yard and parking area. 12. Location of the proposal. Give sufficient information for a person to under- stand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably Page 2 of 19 7099.001 [AEI/sm] wato-kr • • available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The project site is located south of 44th Avenue South and between 131st Place and SR -599, in the city of Tukwila. 13. Does the proposal lie within an area designated on the City's Comprehensive Land Use Policy Plan Map as environmentally sensitive? Page 3 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other b. What is the steepest slope on the site (approximate percent slope)? The steepest slope on the site is a 50 percent side slope in the buffer area adjacent to the right-of-way for SR -599. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. 1 The soils on the site are consistent with glacial till, which is an unsorted, non -stratified glacial drift consisting of clays, silt and sand. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. It not known if there is a history of unstable soils in the area. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Some grading will occur in conjunction with this project. We anticipate that approximately 500 cubic yards of earthwork (removal and/or fill) material may be needed to properly regrade the site. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Air and water erosion of soils during grading and filling is a possibility, but is not anticipated to be significant due to the implementation of mitigation measures under Item 1.h. Page 4 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Approximately 68 percent of the total Hot Mix Pavers Inc. site will be covered with impervious surfaces; i.e., building and paving following completion of the project. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Construction practices will incorporate a temporary erosion and sedimentation control plan. Erosion and sedimentation controls, such as interceptor swales, straw bale barriers, silt fences, and straw mulch for temporary erosion protection of exposed soils may be applied during construction. Temporary construction entrances may also be installed at the beginning of construction and maintained for the duration of the project. All erosion and sedimentation control measures shall be installed and maintained in accordance with City of Tukwila requirements. 2. Air a. What types of emissions to the air would result from the proposal (i.e., dust, automobile odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. There will be construction equipment exhaust that will be emitted from vehicles using gasoline or diesel fuels. These emissions will be temporary in nature and, in our opinion, will not have a lasting or harmful effect on the project or adjacent properties. There may also be airborne dust particles affecting air quality principally during the filling and grading phase of this project. The amount of airborne dust particles generated will be minimal. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. No. Page 5 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT c. 3. Water Proposed measures to reduce or control emissions or other impacts to air, if any: Dust produced during construction could be reduced by using a number of techniques. Areas of exposed soils could be sprayed with water, areas that are exposed for prolonged periods of time could be covered with suitable cover to prevent wind erosion, and street sweeping would be done as necessary to control tracking mud onto streets. a. Surface: 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. There are seasonal wetlands located on the no west cart of the site (between the site and SR -599). There is also a drainage ditch located across South 131st Pl. from the sublec p p rty, which flows into the Duwamish River. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described water? If yes, please describe and attach available plans. The drainage ditch (across from South 131st Place) is 75 feet from the property line; however, it will remain unaltered. The wetland on the north property line will also remain unaltered. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. Not applicable. pa„, utak- (Asask. Page 6 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities, if known. No 5) Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. No. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the types of waste and anticipated volume of discharge. No. b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities, if known. Infiltration, could be reduced as a result of impervious surface coverage, however, no ground water will be withdrawn as a result of the proposed project. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. Not applicable. The development will connect to the public sanitary sewer located within the adjacent right-of-way for domestic sewage disposal. Page 7 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT c. Water Runoff (including stormwater): 1) Describe the source of runoff (including stormwater) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. There will be stormwater runoff during the rainy periods of the year from the paved impervious surfaces and rooftops, and from the pervious landscape areas. Stormwater will be collected, conveyed, treated, and/or detained as determined by the King County Surface Water Design Manual. Water quality will be provided by an oil/water separator or other appropriate means prior to discharge into the downstream drainage system. 2) Could waste materials enter ground or surface waters? If so, generally describe. Not applicable. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: The stormwater collection and conveyance system will include an underground detention pipe, vault, oil/water separator, and will incorporate other best management practices (BMPs) measures in compliance with the State Department of Ecology Manual for Stormwater Management. 4. Plants a. Check or circle types of vegetation found on the site: deciduous tree: alder, maple, aspen, other evergreen tree: fir, cedar, pine, other X shrubs X grass pasture _ crop or grain Page 8 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 5. X wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil, other _ other types of vegetation b. What kind and amount of vegetation will be removed or altered? c. All on-site vegetation within the development area will be removed. List threatened or endangered species known to be on or near the site. There are no known threatened or endangered plant species on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: There will be professionally designed landscaping and pervious areas which will total approximately 31 percent (f 13,885 square feet) of the development site area. The planting areas include enhanced plantings in the wetland buffer area and perimeter plantings. Plantings will be designed in accordance with City of Tukwila standards. Landscaped areas will be irrigated to help the establishment and survival of the plantings. Planting areas will serve both aesthetic and functional purposes by serving to creating an attractive buffer between the adjacent roadway and the development. Animals Circle any birds an animals which have been observed on or near the site or are known to be on or near the site: birds: hawk, heron, eagle, songbirds, other mammals: deer, bear, elk, beaver, other fish, bass, salmon, trout, herring, shellfish, other None wet u v' pt. 1-01 WA, t.iirE4 auArt vALoak k Page 9 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT b. List any threatened or endangered species known to be on or near the site. c. Is the site part of a migration route? If so, explain. The site is located in the Pacific Northwest Flyway route of migratory waterfowl. d. Proposed measures to preserve or enhance wildlife, if any: The provision of landscaping will provide a small additional habitat for small birds. 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Electrical energy will be used for lighting and miscellaneous power equipment. Supplemental energy for heat will be natural gas. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: State energy conservation measures will be incorporated into the project to reduce or control energy impacts of the project. Examples of energy conservation measures could include energy efficient glass windows and the utilization of an insulated building envelope. 4,; -0A) f g A 4 ) a Page 10 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. Environmental hazards include exposure to shop chemicals such as diesel fuel or oil within the associated truck service area. 1) Describe special emergency services that might be required. Special emergency services that may be required during construction phases of the project will include medical, police, and fire. Special emergency services may be needed following completion of the facility. 2) Proposed measures to reduce or control environmental health hazards, if any: The facility provides a significant number of features to reduce and control the potential for environmental health hazards. 1`or example, fire extinguishers are provided in accordance with the Uniform Fire Code standards and requirements. Training of on-site personnel in emergency procedures also helps to avoid the release of any toxic chemicals into the environment. b. Noise: 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? The only off-site noise in the area which may be audible on the site would include traffic from the adjacent streets. 2) What types and levels of noise would be created by or associated with the project on a short-term or long-term Page 11 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. On a short-term basis, it is possible that construction activities will generate noise due to the construction equipment, power tools, and grading equipment. On a long-term basis, it is anticipated that the only noise created by this project will be truck engine noise while entering and exiting the site as well as during maintenance in the shop. Proposed measures to reduce or control noise impacts, if any: None proposed. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Currently the site is vacant. Surrounding site uses: North: State Route 599; farther north, office and industrial park East: Ace Construction, a general excavating contractor South: 131st Place; farther south is a vacant piece of property West: NORMED, office/warehouse b. Has the site been used for agriculture? If so, describe. Unknown. c. Describe any structures on the site. There are no structures on the site. Page 12 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT d. Will any structures be demolished? If so, what? None, not applicable. e. What is the current zoning classification of the site? According t• the City of Tukwila Zoning Code, the subject property is zoned (Commercial/Light Industrial). f. What is the current comprehensive plan designation for the site? g. C/LI (Commercial Light Industrial). If applicable, what is the current shoreline master program designation of the site? The site is not located within 200 feet of the Green River, therefore, there is no mitigation. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. i. Approximately how many people would reside or work in the completed project? The facility will employ approximately three to four people. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: None are proposed. J. vvo — (,later, Z: Q 1pedir!"zt,c%.) Page 13 of 19 7099.001 [AEI/sm] • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: The Hot Mix Pavers Inc. facility will meet the conditions of a light industrial facility, which is allowed in the area and will be consistent with the surrounding land uses of light industrial facilities in the vicinity. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. Not applicable. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. No residential uses will be eliminated as a result of this project. c. Proposed measures to reduce or control housing impacts, if any: Mitigation measures for housing are not necessary. 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The tallest structure in this development will be the new shop/office building which will be 21 feet high. b. What views in the immediate vicinity would be altered or obstructed? None. Page 14 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT c. Proposed measures to reduce or control aesthetic impacts, if any: The perimeter landscape plantings, together with the high quality construction and materials, will provide an aesthetically pleasing development. The new facility will strengthen the established light industrial character of the neighborhood. 11. Light and Glare a. What type of light or glare will the proposals produce? What time of day would it mainly occur? Lighting for the proposed project will consist of shielded wall lighting, shielded parking lot lighting with non -glare fixtures, and illuminated signs. Light impacts will only occur during the evening hours. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off-site sources of light or glare may affect your proposal? None. d. Proposed measures to reduce or control light and glare impacts, if any: Proposed measures to reduce or control light and glare impacts include the use of shields on all lot lights to minimize spillover illumination onto adjacent parcels. Additionally, the perimeter landscape plantings may assist in minimizing light spillover onto adjacent parcels. Page 15 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 12. Recreation a. What designation and informal recreational opportunities are in the immediate vicinity? No recreational facilities are located in the immediate vicinity of the project site. b. Would the proposed project displace any existing recreational uses? If so, describe. No recreational uses exist on site at the present time. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: None are proposed. 13. Historic and Cultural Preservation a. Are there any places or objects listed on, or proposed for, national, state or local preservation registers to be on or next to the site? If so, generally describe. None. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None. c. Proposed measures to reduce or control impacts, if any: Mitigation measures are not required. Page 16 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT 14. Transportation a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on-site plans, if any: The proposed project will be served by South 131st Place and 44th Place South. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Unknown. c. How many parking spaces would the completed project have? How many would the project eliminate? The proposed project will have a total of 13 parking stalls (1 stall is handicap stall). Currently, the site does not provide parking. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). Minor street widening and improvements (sidewalk, curb, and gutter) are required by the City of Tukwila. e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. No. f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. Based on the ITE Trip Generation Manual, 6th Edition © 1997, the project will generate an average of approximately 17 daily trips (AWDT). The land use category from the ITE Manual used are Page 17 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT g. Automobile Care Centers (840) and General Office (710). Due to the low trip generation by this facility, there is no real peak volume of traffic on site. Proposed measures to reduce or control transportation impacts, if any: None proposed. 15. Public Services a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. The project may require an increase in police protection customarily associated with light industrial activities. It is possible that there may be an increased need for fire protection services as well. b. Proposed measures to reduce or control direct impacts on public services, if any: None proposed. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water. refuse service, telephone, sanitary sewer, septic system, other. b. Describe the utilities that are proposed for the project, the utilities providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. Water: Water District No. 125 Sewer: City of Tukwila Electricity: Seattle City Light Telephone: U.S. West Communications Natural Gas: Puget Sound Energy Page 18 of 19 7099.001 [AEI/sm] • • EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: Date Submitted: ai,*;>4/r-e x/8/99 Page 19 of 19 7099.001 [AEI/sm] • • • TABLE OF CONTENTS 1.0 PROJECT OVERVIEW 2.0 PRELIMINARY CONDITIONS SUMMARY 3.0 OFF-SITE ANALYSIS 4.0 DETENTION AND WATER QUALITY ANALYSIS AND DESIGN A. DETENTION VAULT SIZING B. WET VAULT DESIGN CALCULATIONS 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6.0 SPECIAL REPORTS AND STUDIES 7.0 BASIN AND COMMUNITY PLANNING AREAS 8.0 OTHER PERMITS 9.0 EROSION AND SEDIMENTATION CONTROL DESIGN 10.0 BOND QUANTITY WORKSHEET 11.0 MAINTENANCE AND OPERATIONS MANUAL • • • • 1.0 PROJECT OVERVIEW The proposed project is located within the Northeast quarter of Section 15, Township 23 North, Range 4 East, W.M., Tukwila, King County, Washington, and is approximately one acre in size. More specifically, the project lies to the north of South 131st Place at the intersection of 44th Avenue South. Its northern boundary is SR -599. The topography of the site is such that it slopes slightly to the north. Vegetation on the site consists of sporadic grassy vegetation. The site is basically covered with gravel and does not consist of native soils. Since the area is not covered by the King County Soils Conservation Service soil maps, a field reconnaissance determined the project site consists chiefly of gravel, which is considered a till material. Storm drainage for the site will be accomplished by utilizing a combined wet/detention vault. Catch basins will be located on the site to collect runoff from storm events and conveyed by a pipe system into the combined wet/detention vault. The detention system has been sized using the 1998 King County Surface Water Design Manual. The conveyance system on the project will be sized to handle the 25-year/24-hour storm event by the Rational method, as required by the 1998 King County Surface Water Design Manual. Please see Section 5.0 for calculations. A wetland exists along the northern property line. The integrity of this wetland will be maintained during construction and after development of the property. The project site currently drains into this wetland. Please see the off-site analysis portion of this report for a further description of the conveyance through the wetland. 7099.004 [JPJ/sm] • • King County Department of Development and Environmental Services TECHNICALoFORMATION REPORT (TIoWORKSHEET Part 1 " PROJECT OWNER AND PROJECT ENGINEER' • :' L Project Owner Hot Mix Pavers Address 1 122 East Pike Street, Suite 1345 Seattle, Washington 98101 Phone (206) 324-0106 Project Engineer Hal P. Grubb, P.E. Company Barghausen Consulting Engineers, Inc. Address/Phone 18215 - 72nd Avenue South Kent, Washington 98032 Part.3 TYPE OF PERMIT APPLICATION Subdivision Short Subdivision Grading V Commercial Other Part 2 PROJECT LOCATION AND DESCRIPTION: Project Name Hot Mix Pavers Location Township 23 North Range 4 East Northeast Quarter Section 15 Part 4 OTHER REVIEWS AND PERMITS DFW HPA Shoreline Management COE 404 Rockery DOE Dam Safety Structural Vaults ✓ FEMA Floodplain Other COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community Tukwila Drainage Basin Southgate Creek / Duwamish River Part 6 SITE CHARACTERISTICS River Floodplain Stream V Wetlands Critical Stream Reach Seeps/Springs Depressions/Swales High Groundwater Table Lake Groundwater Recharge Steep Slopes Other Part 7 SOILS Soil Type Unmapped Gravel (till) Slopes Additional Sheets Attached Erosion Potential Erosive Velocities 7099.005 [JPJ/jss] Part 8 DEVELOPMENT LIMITATIONS REFERENCE ✓ Ch. 4 - DownstreaAnalysis Additional Sheets Attached LIMITATION/SIT NSTRAINT Part 9 ESC REQUIREMENTS Grass Lined Channel V Pipe System Open Channel Dry Pond Wet Pond Tank ✓ Vault Energy Dissipater V Wetland Stream MINIMUM ESC REQUIREMENTS Method of Analysis KCRTS MINIMUM ESC REQUIREMENTS Brief Description of System wet/detention vault. DURING CONSTRUCTION basins connected by pipes AFTER CONSTRUCTION ✓ Sedimentation Facilities V Stabilize Exposed Surface ✓ Stabilized construction Entrance V Remove and Restore Temporary ESC Facilities V Perimeter Runoff control ✓ Clean and Remove all Silt and Debris Clearing and Grading Restrictions ✓ Ensure Operation of Permanent Facilities Cover Practices Flag Limits of SAO and open space ✓ Construction Sequence preservation areas Other Other Part 10 SURFACE WATER SYSTEM Grass Lined Channel V Pipe System Open Channel Dry Pond Wet Pond Tank ✓ Vault Energy Dissipater V Wetland Stream Infiltration Depression Flow Dispersal Waiver Regional Detention Method of Analysis KCRTS Compensation/Mitigati on of Eliminated Site Storage Brief Description of System wet/detention vault. Operation Catch basins connected by pipes draining to combined Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS ✓ Cast in Place Vault Retaining Wall Rockery >4' High Structural on Steep Slope Other Part 12 EASEMENTS/TRACTS Drainage Easement Access Easement Native Growth Protection Easement Tract Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under by supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information pr.vided here is accurate. Signed/Date 7099.005 [JPJ/jss] • • UPSTREAM/DOWNSTREAM DRAINAGE REPORT FOR PROPOSED HOT MIX PAVERS PROJECT SOUTH 133RD PLACE TUKWILA, WASHINGTON GHA ENG OUR JOB NO. 7099 SEPTEMBER 2, 1999 Prepared By: BARGHAUSEN CONSULTING ENGINEERS, INC. 18215 72ND AVENUE SOUTH KENT, WASHINGTON 98032 (425) 251-6222 • CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES • • 1.0 INTRODUCTION/GENERAL INFORMATION A. General Information The proposed project lies within a portion of the Northeast quarter of Section 15, Township 23 North, Range 4 East, Willamette Meridian, Tukwila, King County, Washington, and is approximately 1 acre in size. The site is bounded by South 133rd Place on the south, SR -599 on the north, and adjacent developments on the east and west. Currently, the site is undeveloped and consists of graded land with chiefly gravel fill material and sparse grass vegetation throughout the site. The site slopes gently to the north toward an existing drainage swale along the right-of-way of SR -599. The drainage swale flows westerly toward Southgate Creek, approximately 550 feet away. Southgate Creek flows into an existing 66 -inch culvert that flows underneath SR -599 in a northerly direction. The proposed project is to construct a small building located along the frontage of South 133rd Place with associated parking, landscaping, and driveways on the northern portion of the property. B. Response to CORE and Special Requirements CORE Requirement No. 1 - Drainage at Natural Location: The drainage produced from the proposed development will be collected and discharged at its natural location to a wetland on the north property line, adjacent to SR -599, which consists mainly of a swale flowing in a westerly direction eventually reaching Southgate Creek. The proposed development will not alter the existing drainage course nor divert stormwater onto or away from the adjacent downstream properties. CORE Requirement No. 2 - Off -Site Analysis: This report contains an Upstream Area Analysis and a Level 1 Downstream Drainage Analysis for the project site. The final site development plans will demonstrate that the development will have no adverse effects on the downstream drainage system. CORE Requirement No. 3 - Runoff Control: This project is located within the Green River Basin. Storm drainage detention and water quality systems will be designed in accordance with the requirements of the 1998 King County Surface Water Design Manual and City of Tukwila standards. The preliminary design concept utilizes a combined wet/detention vault to provide storage, release, and water quality requirements. CORE Requirement No. 4 - Conveyance System: All storm drainage runoff produced from the proposed project will be collected by catch basins and underground pipes and tightlined to the northern portion of the project for detention and water quality treatment prior to discharging from the site. A combined wet/detention vault will provide water quality treatment. The proposed storm drainage conveyance system will be designed to convey the 25-year/24-hour design storm in accordance with the 1998 King County Surface Water Design Manual and City of Tukwila standards. 7099.003 [JPJ/jss/sm] • • CORE Requirement No. 5 - Temporary Erosion and Sedimentation Control: A temporary erosion and sedimentation control plan is proposed for the project site in order to prevent, to the maximum extent possible, the transport of sediment from the project site to the downstream drainage facilities, water resources, and adjacent properties. CORE Requirement No. 6 - Maintenance and Operations: A Maintenance and Operations Manual will be prepared as part of the final Technical Information Report and will provide instructions on how to maintain the combined water quality wet/detention vault along with the schedule for maintenance of the storm drainage conveyance system and catch basins. CORE Requirement No. 6 - Financial Guarantees and Liability: Financial guarantees and liability insurance requirements will be addressed at the time of plan review and construction. CORE Requirement No. 8 - Water Quality: CORE Requirement No. 8 has been reviewed, and it has been determined that basic water quality is all that is required for water quality for this site. Therefore, a combined wet/detention vault will provide the basic level of water quality required to serve this area. Special Requirement No. 1 - Other Adopted Area Specific Requirements: The proposed project site is located within the Green River Basin. A stormwater detention and water quality facility will be designed and constructed on site. The site does not lie within a critical drainage area, a Master Drainage Plan area, a Basin Plan, a Lake Management Plan, or a Shared Facility Drainage Plan area. Therefore, this requirement does not apply to this project. Special Requirement No. 2 - Floodplain/Floodway Delineation: No portion of the site lies within the 100 -year floodplain as depicted on the FEMA floodplain map (Exhibit "D"). The proposed project does contain a wetland, which will be protected. Special Requirement No. 3 - Flood Protection Facility: This site is not protected by a levee, a revetment, or berm. Therefore, it does not require proper analysis, design, and construction methods to prevent potentially catastrophic consequences should such facilities fail. Special Requirement No. 4 - Source Controls: In addition to the water quality wet/detention vault proposed for this development, there is also a need for down -turned elbows, otherwise known as spill control catch basins, that will be utilized for all catch basins on site. 7099.003 [JPJ/jss/sm] Special Requirement No. 5 - Oil Control: This proposed project does not meet the threshold of a high use site as delineated in the King County Surface Water Design Manual. Therefore, Special Requirement No. 5 does not apply to this project. 7099.003 [JPJ/jss/sm] 2.0 UPSTREAM/DOWNSTREAM DRAINAGE ANALYSIS A. Upstream Area The proposed project site is located within the Southgate Creek Drainage Basin, which is approximately 510 acres in size. The Southgate Creek Drainage Basin is highly urbanized and generally slopes to the northeast toward the Duwamish River. It is bounded on the north by South 130th Street, on the west by 24th Avenue South, on the east by 1-5, and on the south by South 146th Street. Please see Exhibit "G.1" of this report for a pictorial delineation of the approximate boundaries of the Southgate Creek Drainage Basin. Defining drainage courses for the entire Southgate Creek Drainage Basin is beyond the scope of this report. However, Exhibit "G.2" delineates the drainage course within close proximity to the subject site. No more application of off-site upstream runoff is proposed for this development. All of the off-site upstream runoff contributing to this site is collected in a ditch along the north property line, adjacent to SR -599, and conveyed in a westerly direction toward Southgate Creek, as mentioned previously. B. Downstream Drainage Analysis Flow exits the project site through an open ditch flowing along the north property line of the subject property, which is thickly vegetated, and is conveyed in a westerly direction for approximately 550 feet along the toe of the slope of the right-of-way of SR -599 until the flow merges with Southgate Creek and flows northerly through a 66 -inch CMP culvert. This culvert conveys flow underneath SR -599 for approximately 290 feet. At this point, the culvert is expanded into a ± 15 -foot diameter culvert and continues to the northeast for approximately 40 feet where it then outlets into an existing open channel. Located within the ± 15 -foot CMP culvert is a series of four V -notch weirs. Once the flow enters the open channel, it continues to the north/northwest for approximately 100 feet. The runoff then outlets into a 66 -inch diameter CMP culvert. The culvert continues north for approximately 160 feet where it outlets into the Green River, approximately 1,000 feet downstream of the site. See Exhibit "B," Drainage Area Map, and Exhibit "C," Off-site Analysis Drainage System Table. 7099.003 [JPJ/jss/sm] • EXHIBIT "A" VICINITY MAP • tti a"7" --=i111 al 0 ana.14&1-14•TFV3n= • • EXHIBIT "B" DRAINAGE AREA MAP • • EXHIBIT "C" OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Basin: Green River Subbasin Name: Southgate Creek Subbasin Number: Symbol • Drainage. Component. Type, Name, and Size . Drainage Component Description Slope Distance from Site Discharge Existing Problems Potential Problems Observations, of Field Inspector Resource Reviewer, or Resident_ See Map Type: sheet flow, swale, stream, channel, pipe, pond; size, diameter, surface area Drainage basin, vegetation, cover, depth, type of sensitive area, volume % Ft Constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion Tributary area, likelihood of problem, overflow pathway potential impacts CD Vegetated Swale 1:1 Side Slopes 0.5± 0'-550' None Noted None Noted 0 66 -inch CMP under SR -599 Rock/Soil Head Walls 1-2± 550'-840' Inlet Densely Vegetated No apparent problems © ±15 -foot Diameter CMP with V -Notch Weir 66 -inch Culvert Expands to 15 -foot Diameter CMP with Series of (4) V -Notch Weirs Contained in Culvert. Concrete Head Walls 1-2± 840'-870' None Noted None Noted ® Open Channel Grass/Soil Lined 1:1 Side Slopes 3± 870'-950' None Noted None Noted © 66 -inch CMP Culvert Outlets to Green River 1-2± 950'-1100' None Noted None Noted © Green River . 7099.002 [JPJ/jss] • • EXHIBIT "D" BASIN STUDY • • RECONNAISSANCE REPORT NO. 26 DUWAMISH RIVER BASIN JUNE 1987 Natural Resources and Parks Division and Surface Water Management Division King County, Washington • • EXHIBIT D m 3 3 Fun ALLENTON BRIO 44TH PL SOUTH .- NS' King County Executive Tim Hill King County Council Audrey Gruger, District 1 Cynthia Sullivan, District 2 Bill Reams, District 3 Lois North, District 4 Ron Sims, District 5 Bruce Laing, District 6 Paul Barden, District 7 Bob Grieve, District 8 Gary Grant, District 9 Department of Public Works Don LaBelle, Director Surface Water Management Division Joseph J. Simmler, Division Manager Jim Kramer, Assistant Division Manager Dave Clark, Manager, River & Water Resource Section Larry Gibbons, Manager, Project Management and Design Section Contributing Staff Doug Chin, Sr. Engineer Randall Parsons, Sr. Engineer Andy Levesque, Sr. Engineer Bruce Barker, Engineer. Arny Stonkus, Engineer Ray Steiger, Engineer Pete Ringen, Engineer Consulting Staff Don Spencer, Associate Geologist, Earth Consultants, Inc. John Bethel, Soil Scientist, Earth Consultants, Inc. P:CR Parks, Planning and Resources Joe Nagel, Director Natural Resources and Parks Division Russ Cahill, Division Manager Bill Jolly, Acting Division Manager Derek Poon, Chief, Resources Planning Section Bill Eckel, Manager, Basin Planning Program Contributing Staff Ray Heller, Project Manager & Team Leader Matthew Clark, Project Manager Robert R. Fuerstenberg, Biologist & Team Leader Matthew J. Bruengo, Geologist Lee Benda, Geologist Derek Booth, Geologist Dyanne Sheldon, Wetlands Biologist Cindy Baker, Earth Scientist Di Johnson, Planning Support Technician Robert Radek, Planning Support Technician Randal Bays, Planning Support Technician Fred Bentler, Planning Support Technician Mark Hudson, Planning Support Technician Sharon Clausen, Planning Support Technician David Truax, Planning Support Technician Brian Vanderburg, Planning Support Technician Carolyn M. Byerly, Technical Writer Susanna Hornig, Technical Writer Virginia Newman, Graphic Artist Marcia McNulty, Typesetter Mildred Miller, Typesetter Jaki Reed, Typesetter Lela Lira, Office Technician Marty Cox, Office Technician TABLE OF CONTENTS I. SUMMARY II. INTRODUCTION III. FINDINGS IN DUWAMISH RIVER BASIN A. Overview B. Effects of Urbanization C. Specific Problems 1. Erosion of channel banks and streambeds 2. Flooding in some locations 3. Further degradation of water quality IV. RECOMMENDATIONS A. Safeguard against continued erosion B. Improve overall effectiveness of surface water management C. Improve habitat conditions, particularly in tributaries V. MAP APPENDICES: APPENDIX A: Estimated Costs APPENDIX B: Capital Improvement Project Ranking APPENDIX C: Detailed Findings and Recommendations 1 1 2 2 4 4 4 5 5 6 6 7 9 A-1 B-1 C-1 L SUMMARY The Duwamish River Basin, in western King County, is intensely urbanized. Commercial and industrial land uses dominate the basin on either side of the Duwamish River and along its valley. Single-family residences are located along the valley walls and on the plateau above the valley; residential land uses are expected to reach saturation by the year 2000. In the process of urbanization, nearly all of the basin's tributaries have been piped and chan- neled. Outfall pipes within the tributary network are fitted with flap gates to minimize the effects of flooding when the Duwamish River rises during flood stages or as a result of tidal influences. Other alterations to the stream system in the lowland areas include the placement of numerous artificial channels and culverts underneath State Roads (SR) 99 and 599. These carry runoff from three major freeways, as well as from extensive parking lots, one airfield (Boeing), and industrial areas, to the stream system. All wetlands except one have been eli- minated in the basin. Not surprisingly, there are serious environmental problems throughout the basin. The most serious of these, water quality, is being studied by numerous public agencies. The recon- naissance, which focused on drainage and erosion problems and resulting contamination of the stream system, identified several problems. Fust, bank erosion and mass -wasting were observed in many locations, the most serious instances occurring along steep valley walls. Second, flooding occurs in some places, most notably in the Allentown area. And third, degradation of the tributaries from sidehill drainage is one of many factors accounting for the fact that fish habitat is nearly nonexistent. The field team investigating the basin recommends that 1) erosion be slowed by implementing planning, engineering, and regulatory measures; 2) the general effectiveness of surface water management be improved with a combination of enhanced maintenance on existing facilities and the construction of new facilities where needed; and 3) habitat conditions be improved where feasible, particularly those related to poor water quality from sidehill drainage. II. INTRODUCTION: History and Goals of the Program In 1985 the King County Council approved funding for the Planning Division (now called the Natural Resources and Parks Division), in coordination with the Surface Water Management Division, to conduct a reconnaissance of 29 major drainage basins located in King County. The effort began with an initial investigation of three basins -- Evans, Soos, and Hylebos Creeks -- in order to determine existing and potential surface water problems and to recom- mend action to mitigate and prevent these problems. These initial investigations used available data and new field observations to examine geology, hydrology, and habitat con- ditions in each basin. P:DU Findings from these three basins led the King County Council to adopt Resolution 6018 in April 1986, calling for reconnaissance to be completed on the remaining 26 basins. The Basin Reconnaissance Program, which was subsequently established, is now an important ele- ment of surface water management. The goals of the program are to provide useful data with regard to 1) critical problems needing immediate solutions, 2) basin characteristics for use in the preparation of detailed basin management plans, and 3) capital costs associated with the early resolution of drainage problems. The reconnaissance reports are intended to provide an evaluation of present drainage con- ditions in the County in order to transmit information to policymakers to aid them in deve- loping more detailed regulatory measures and specific capital improvement plans. They are 1 • • Duwamish River Basin (continued) not intended to ascribe in any conclusive manner the causes of drainage or erosion problems; instead, they are to be used as initial surveys from which choices for subsequent detailed engineering and other professional environmental analyses may be made. Due to the limited amount of time available for the field work in each basin, the reports must be viewed as descriptive environmental narratives rather than as final engineering conclusions. Recommendations contained in each report provide a description of potential mitigative measures for each particular basin; these measures might provide maximum environmental protection through capital project construction or development approval conditions. The appropriate extent of such measures will be decided on a case-by-case basis by County offi- cials responsible for reviewing applications for permit approvals and for choosing among com- peting projects for public construction. Nothing in the reports is intended to substitute for a more thorough environmental and engineering analysis possible on a site-specific basis for any proposal. III. FINDINGS IN THE DUWAMISH RIVER BASIN The field work in the basin was conducted in February 1987 by Ray Heller, resource planner, Lee Benda, geologist; and Arny Stonkus, engineer. Their findings and recommendations follow. A. Overview of the Basin The part of the Duwamish River Basin under King County jurisdiction is located in western King County along the Interstate 5 (I-5) corridor, just south of Seattle and north of Tukwila (the basin's northern and southern boundaries, respectively). The western boundary abuts the Miller and Salmon Creek Basins, while the eastern boundary abuts the Lake Washington Basin. The basin contains the King County Airport at Boeing Field and portions of SR 99, 509, and 599 as well as I-5. Historically, the Duwamish River flowed north from the confluence of the Green and Black Rivers. The Black River no longer exists, but the Green River north of its historic confluence is still referred to as the Duwamish and this report identifies the associated basin as the Duwamish River Basin. The Duwamish River flows north through the communities of Allentown and South Park and through the Duwamish industrial area in south Seattle. The river -- known as the Duwamish Waterway near its mouth -- splits around Harbor Island into the East and West Waterways before discharging into Elliott Bay, adjacent to downtown Seattle. The reconnaissance excluded subbasins wholly within the city of Seattle. The Duwamish River Basin is intensely urbanized, with commercial and industrial land uses predominating on either side of the river along the valley bottom. The sideslopes and plateaus above the valley are mainly used for single-family residences, with multi- family residential and commercial land uses also present in various locations. All of the unincorporated portion of this basin is within the Highline Community Planning Area, which lost population between 1970 and 1980. The population level has stabilized and moderate growth is expected in all types of land use by the year 2000. Most future growth in commercial and industrial land uses will be in the river valley bottom currently used for these purposes. Single-family and multi -family housing will reach saturation on the valley sideslopes and on the upland plateau. P:DU 2 Duwamish River Basin (continued) P:DU Dominant geologic and geomorphic features. The geology of the Duwamish River Basin consists of sedimentary and volcanic bedrock, glacial deposits of various ages and types, •and alluvium in the valley bottoms. The major bedrock outcrops appear in the southern portion of the basin near Tukwila and consist of sandstones and intrusive volcanic rocks. Glacial sediments include undifferentiated pre-Vashon sand and gravel, Vashon till, recessional outwash sand, and glacio-fluvial sand and gravel. Till is found along most of the highlands and generally caps the drumlinoid hills. Recessional out - wash sand is interspersed throughout the till and is commonly found along shallow stream valleys and other depressional areas. Landslide deposits exist within steep -walled tributary valleys. Recent alluvium, composed of gravel, sand, and silt, fills the Duwamish Valley and the bottom of the tributary valleys. The morphology of the basin is dominated by, the valley of the Duwamish River. The valley is cut into sedimentary and volcanic bedrock. While the Duwamish River once meandered across its floodplain on the valley floor, it now flows through a diked chan- nel, as do its tributaries. During the last several glaciations, sediments were deposited on the bedrock in the form of glacio-fluvial sand and gravel, recessional outwash sand, and till. These glacial deposits were shaped into drumlinoid hills, with axes trending northwest -southeast. Drainage channels in the uplands are not well developed or integrated. Where drainage was routed over the valley walls, deep narrow valleys were formed through the glacial sediments. Landslides formed hummocky and chaotic terrain along the steep walls of tributary valleys and of the Duwamish Valley. Hydrologic and hydraulic features. Several highly urbanized subbasins, all distinct in character from one another, make up the Duwamish River Basin. Some natural drainages display undisturbed riparian environments, while severe erosion, scouring, and downcutting typify others. The majority of the basin's tributaries are either piped or ditched as they approach the lowland areas and their confluences with the Duwamish River. Outfall pipes within the tributary network are usually fitted with flap gates to minimize the backwater effects of flooding in the river. Alterations to the stream system in the lowland areas include many artificial open channels and major culverts that cross SR 99 and 599. Drainages in the upper subbasins flow through natural swales, steep natural channels, and ravines, as well as through numerous culverts. Many of the streams flow peren- nially from groundwater sources. Reconnaissance revealed that natural storage systems are nearly nonexistent in this basin: There are no lakes and only one small wetland. Habitat characteristics. The fate of stream habitat and fish in this basin was deter- mined during the late 1800s through the 1950s. During this time the Duwamish floodplain was almost totally filled, and the river was dredged and diked. As already described, this process of urbanization completely eliminated the natural features of the river and its corridor. In addition, the discharge of oils and other toxicants from thousands of acres of industrial land and the dumping of domestic garbage (which is common although illegal) have produced serious water quality problems along the waterway. Water pollution has caused documented fish kills in recent years, resulting in fines against the responsible parties. In addition, Metro, King County, the Washington State Department of Ecology (DOE), and the U.S. Environmental Protection Agency 3 • • Duwamish River Basin (continued) P:DU (EPA) have initiated studies to better define problems and solutions in order to improve water quality along the river. No anadromous fish were found in any of the streams at the time of reconnaissance. Resident fish may exist but were not observed during the reconnaissance study. Streams on the valley slopes and upland plateau are also devoid of fish. The tribu- taries in these upland areas show evidence of damage from the high flows of urban runoff, contamination from garbage dumping, introduction of other toxicants, alterations, filling, and high sediment Toads. Most streams have few pools or the large organic debris necessary for fish refuge. Two streams (Trib. 0002, 0003) do have some instream and riparian habitat structures (e.g., protective streamside vegetation, pools, and large organic debris) that might support trout. The possibility of enhancing these fish habitats should be explored and if feasible pursued. B. Effects of Urbanization in the Basin The same process of urbanization that has contaminated the waters of the Duwamish River Basin and destroyed most of the fish and fish habitat has also severely impacted the basin's drainage system. Erosion of channel beds and banks has produced heavy sediment loads, which have been carried down steep gradients and deposited on the valley floor. Deposition points have too often been within artificial conveyance systems, which have become clogged and constricted during times of heavy flows. This inability of the drainage system to handle higher flows is particularly noticeable in the lower stretches of Tributaries 0001A, 0001B, 0002, 0003, and 0003D. When high flows in the Duwamish river cause floodgates to close at tributary outfalls, flows that originate in the eastern subbasins back up in local conveyance systems in Allentown and cause flooding. Pipe outfalls exist at river miles 7.70 and 7.80. Highway contaminants produce many of the water quality problems in the basin. Most contaminants enter the stream and storm systems unabated by pollution -control devices such as oil/water separators. One drain pipe outfalls onto a steep slope at South 112th Street, just above SR 509. This pipe is discharging noticeable amounts of gasoline and oil from an unknown source, killing insects and plant life on the slope. C. Specific Problems Identified As noted earlier, there are a number of public agencies presently studying the severe water quality problems present in the Duwamish River Basin. The goal of these studies is to recommend mitigation measures in the Duwamish Waterway. The reconnaissance work presented here focused primarily on drainage problems in the tributary subcatch- ments, with secondary emphasis given to water quality and habitat problems. 1. Erosion of channel banks and streambeds was found in numerous locations throughout the basin. However, urbanization is so advanced in this basin that development -related erosion is actually at a minimum. In general, streams and bluffs in the lower Duwamish River Valley are stable and show only moderate increases in erosion. Serious erosion found during reconnaissance was restricted to the steep -walled tributary valleys and areas along valley walls of the Duwamish River. For example: 4 Duwamish River Basin (continued) P:DU a. Channel -bed erosion occurs on Tributary 0003G at river mile .95. The cause is uncontrolled urban runoff; the problem will continue if not addressed. b. Bank erosion and scouring occur on Tributary 0003E at • river mile .00. Debris is building up at the headwall, causing flows to damage the bank. Increased storm flows from development are apparently the cause. c. Instream bank erosion is occurring on Tributary 0002 at river mile .55, with no apparent abatement. Bank erosion also is occurring along the channels of Tributaries 0002 and 0003, presumably from development -related increases in flows. d. Road embankment erosion is occurring on Tributary 0002E -at the 47th Avenue and South 109th Street intersection. The resulting sediment is filling two 36 -inch culverts at the lower end. The flows will back up onto private property if the culverts are not cleaned. e. Hillside erosion is occurring at South 112th Street above SR 509, where a pipe discharges directly onto a steep slope. There is no energy dissipation for flows. f. Two landslides were observed on the valley wall beneath residences in the valley of Tributary 0002 at river mile .70. These may have occurred because of the stormwater that is routed directly onto steep slopes, a situation made worse by vegetation removal along the slope. Another landslide has occurred in bedrock at Tributary 0003, river mile .16, along the main valley of the Duwamish River. 2. Flooding occurs in some locations along the Duwamish River system. For example: a. Outfall from Allentown to the Duwamish (Trib. 0001, RM 7.70 and 7.80) will continue to back up when the floodgates are closed at times of high flows. b. Flooding of the storm system at the intersection of Eighth Avenue S and South 100th Street is being caused by sedimentation, which fills and constricts the pipes there. If allowed to continue, flooding could lead to accelerated road failure. 3. Water quality is being further degraded in several locations: a. The illegal but common practice of dumping domestic garbage in streams is very prevalent. Tributaries 0001E and 0001F both had large amounts of garbage in them. b. There are possible leakages of septic tanks into Tributary 0001F at river mile .12. The stream had a septic odor on the date it was examined. c. Sediment from an upstream fill is producing water quality problems on Tributary 0002A, river mile .15. Sediment in turn is filling pools. Downstream from the Glendale golf course on Tributary 0001E, there are • • Duwamish River Basin (continued) excessive amounts of sediment and algae in the water. Algae could be the result of fertilizers and sprays at the golf course. W. RECOMMENDATIONS FOR ACITON Controlling erosion and increasing the overall effectiveness of surface water management are the main goals in the Duwamish River Basin. A. Use planning and regulatory measures as a long-term safeguard against continued ero- sion and other mass -wasting. 1. Enforce the County's Sensitive Areas Ordinance and slope regulations along steep slopes of tributaries and the Duwamish River Valley. 2. Prohibit the muting of stormwater onto steep slopes without energy dissipation and other appropriate measures to control runoff in a safe, nonerosive manner. 3. Designate certain portions of the tributary valleys as landslide hazard areas in the Sensitive Areas Map Folio. 4. Establish native growth protection easements in tributary valleys. This will make banks more stable and provide a source of large woody debris for energy dissi- pation in streams. Both are erosion -control measures. B. Improve the overall effectiveness of surface water management in the basin. 1. Increase maintenance of present conveyance facilities to assure they are functioning properly. a. Clean debris and silt from two 36 -inch culverts on Tributary 0002E at the 47th Avenue S and South 109th Street intersection in order to reduce moisture intrusion into the base course of the road. b. Repair the damaged manhole at the intersection of Eighth Avenue S and South 100th Street. Construct an inlet structure with sediment/silt control to alleviate overtopping of the channel and to prevent further destruction of the road. 2. Construct new facilities for conveyance and R/D as needed for flood control and overall drainage efficiency. a. Install a pumping station in Allentown on Tributary 0001 at river miles 7.70-7.80 to reduce flooding when the Duwamish River is running high at the outfall of these two points. Pump flows into the Duwamish River. b. Tightline flows using energy dissipators at South 112th Street above SR 509 to disperse water beyond the steep slopes, which are now being eroded. P:DU 6 • • Duwamish River Basin (continued) P:DU c. As a measure of additional storage, encourage the city of Tukwila to construct an R/D facility on Tributary 00030, near the intersection of 44th Street S and South 31st Place, to aid in controlling peak, flows. Conveyance pipes in this vicinity are presently undersized. 3. King County should work with the cities of Seattle and Tukwila where drainage basins are shared. Some tributaries may call for basin plans. 4. Surface water management and discharges into the Green and Duwamish Rivers should be coordinated with the principles and requirements of the Green River Management Agreement. C. Improve habitat conditions, where feasible, particularly those related to the contamination of tributaries by sidehill drainage. 1. Improve enforcement of no -dumping ordinances by King County and the city of Seattle. 2. Establish stream corridor guidelines, including setbacks limiting clearing, and other regulatory measures as appropriate to protect the remaining habitat in the basin. 7 1111111•11.111 4 sumbtIo j DUWAM1SH RIVER BASIN Basin Boundary Subcatchment Boundary CI Collection Point .Stream owl Tributary Number •1301 Proposed Project 1 oh, "' Sr L '., • T. 7 •, - 0 Y2 1 Mile L ! i ,.. • , I.• ; . -- ' 1 A I • . ...'.. : .I. • t • : 1 .... ' i' • S t i \ -4.. ,./ - " APPENDIX A ESTIMATED COSTS: PROPOSED CAPITAL IMPROVEMENT PROJECTS DUWAMISH RIVER BASIN Indicates project was identified by Surface Water Management office prior to reconnaissance. NOTE: All projects are located on map included in this report. Project Number Collect. Point Project Description 1301* 7 Construct R/D-siltation pond adja- cent to 8th Ave. S. and between S 100th St. and S 96th St. (4 acre - ft. of capacity). 1304 21 Installation of pump station. • 1306 27 Construct R/D facility at 133rd St. S and S Marginal Way E. Problem Addressed Reduce downstream flooding and siltation. Reduce flooding in Allentown from con- veyance system backups when high flows occur in the Duwamish River. Reduce downstream flooding in Tukwila. Estimated Costs and Comments $140,000 (dependent on acquir- ing right-of-way from Seattle City Light) $100,000 $222,000 (dependent on land acquisition costs) APPENDIX B CAPITAL IMPROVEMENT PROJECT RANKING DUWAMISH RIVER BASIN Prior to the field reconnaissance of the Duwamish River Basin, five projects had been identified and rated using the CIP selection criteria developed by the Surface Water Management (SWM) and Natural Resources and Parks Divisions. Following the reconnaissance, three projects remain pro- posed for this area. Three projects were eliminated based on the consensus of the reconnaissance team. One of the projects has already been completed, one had no apparent problems, and the other project could not be located. One project (1306) was added. The previous SWM capital improvement project list for the Duwamish River Basin had an estimated cost of $1,280,000, while the revised cost estimate changes to $462,000 for the three projects. This 64% reduction is due mainly to the elimination of three previously identified projects. The following table summarizes the scores and costs of the proposed CIPs for the Duwamish River Basin. The projects were rated according to previously established SWM Program Citizen Advisory Committee criteria. The projects ranked below are those for which the first rating question, ELEMENT 1: "GO/NO GO," could be answered affirmatively. These projects can now be con- sidered for merging into the "live" CIP list. Any project scoring over 100 points should be con- sidered for incorporation into the six-year CIP list. P:DU.APB RANK PROJECT NO. SCORE COST 1 1306 127 $222,000 2 1304 45 10000 3 1301" 30 140,000 TOTAL $462,000 Indicates project was identified by the Surface Water Management Division prior to reconnaissance. B-1 • APPENDIX C DETAILED FINDINGS AND RECOMMENDATIONS DUWAMISH RIVER BASIN ° All items listed here are located on final display in the offices of Surface Water Management, Building and Land Development, and Basin Planning. Trib. & Collect. Existing Item` River Mile Point Category Prop. Proj. Conditions and Problems 1 3 7 Hydrology 1301 Flat area with stream meander under Seattle City. Light transmission towers. SWM -proposed CIP site. 7 Hydrology 9 Hydrology Altered manhole (hole knocked into side). Sedi- ment buildup in system. Road failing just down- stream. Hillside above State Road 509 and below S 112th St. suffers from erosion caused by outfall. No energy dissipation. 4 0001 21. Hydrology 1304 Water backs up in con - RM 7.70 & veyance system into 7.80 Allentown when the Duwamish rises and floodgates close. P:DU.APC C4 Anticipated Conditions and Problems None. Siltation of conveyance system will restrict flows in the future causing overtopping onto road and road failure. Increased scouring and incising of hillside; sediment/silt outwash onto SR 509 will worsen. No relief from Duwamish River high flows. Local flooding will continue from conveyance system backups. Recommendations Construct the proposed R/D and siltation -control facility if right-of-way can be obtained from City Light. Reconstruct the altered manhole to function as intended. Construct an inlet structure with sediment/ silt control to alleviate over- topping of the channel and to prevent further road destruction. Tightline pipe system beyond eros sensitive slopes. Construct an energy dissipator at outlet end of tightline. King County Roads should investigate this problem. Install a pumping station to reduce flooding of Allentown, near outfall points of RM 7.70 and 7.80. � Trib. & Collect. Existing Item River Mile Point Category Prop. Proj. Conditions and Problems 5 0001B 4 Habitat 6 0001E 8 Habitat RM 1.00 7 0001F 8 0002 RM .50 9 0002 RM .60-.75 22 Habitat 10 Habitat 10 Geology No visible problems in stream or stream corridor. Very little fish habitat due to excessive flows, erosion, sediment, and garbage. Algae is growing profusely in the stream, indicating possible nutrient loading from fertilizer at upstream golf course. Septic odor in stream and loads of garbage below 47th Ave. S. Ditched stream with check dams to reduce erosion and sedimentation. Streamside banks are bare. Prehistoric landslide terrain. P:DU.APC C-2 Anticipated Conditions and Problems Future development could encroach into the stream corridor and increase flows to erosive levels in the stream. Problem will continue. Problem will continue. Problem will continue. Removal of vegetation or routing stormwater over steep slopes may cause land- slides. Recommendations Coordinate with city of Seattle to establish and protect a stream corridor at least 25 ft. back from the top of the stream -bank on each side of the stream. Existing and future flows should be kept at nonerosive levels. Basin plan should consider R/D • facility in golf course above problem site to reduce existing and future flows. Future development runoff should be kept at nonerosive levels. - Require all future residences to connect to sanitary sewer, if available. - Improve enforcement of no -dumping laws. - Notify Seattle -King County Health Dept. of problem. • Revegetate banks. Restrict future development runoff to levels that are nonerosive in the downstream system. Map inner valley as landslide hazard in Sensitive Areas Map Folio (SAMF). Trib. & Collect. Existing Item River Mile Point Category Prop. Pro'. Conditions and Problems 10 0002 RM.70 11 0002 RM.70 12 0002A RM.10 13 0002A RM.75-.90 14 0002A RM.75-.90 15 002A RM.95 10 Habitat 10 Geology 10 Habitat 10 Geology 10 Geology 10 Hydrology Ham Creek. Good trout habitat. Small pools and some large organic debris are present. Sediment is a problem. Two landslides beneath residences. Poor fish habitat. Lots of algae growing within the stream. Lots of garbage, sediment from upstream fill and possible nutrients exhibited by the algae presence. No benthic organisms present. Landslide terrain. Channel bank erosion of moderate intensity. Undersized pipe capacity due to a partial siltation of the conveyance system. P:DU.APC C-3 Anticipated Conditions and Problems Future development could increase flows, erosion, and resulting sediment that will fill pools and clog gravel. Stormwater has been piped down one landslide. Continued surface erosion. Possibility of future landslides. Conditions will continue. Removal of vegetation or rout- ing stormwater over steep slopes may cause landslides. Continued erosion. Continuation of present prob- lems, which will become more severe as pipe capacity diminishes with added silta- tion. Recommendations Restrict present and future develop- ment runoff to levels that are nonerosive in the stream system. Map valley landslide hazard in SAMF. Discourage or prohibit vegetation removal and routing of stormflow onto steep slopes. Remove or stabilize fill at upstream end of ravine. Map inner valley landslide hazard SAMF. None. Check grate capacities for street drainage system. Remove flow obstructions in pipes. Trib. & Collect. Existing Item River Mile Point Category Prop. Prof. Conditions and Problems 16 0002E 17 0003 RM.10 18 0003D RM1.10 19 0003E RM.02 20 0003G RM.02 21 0003G RM.195 0003E RM.00 22 Hydrology 15 Habitat 23 Habitat 27 Geology 27 Habitat 27 Hydrology/ Habitat Series of two 36 -in. cul- verts passing under road. Lower pipe almost silted in in at downstream end. Road erosion at turn radius of intersection. Septic odor from swales. Location is 47th Ave. S and S 109th St. Stream corridor and in - stream habitat seems ade- quate for trout. Anadromous usage blocked the river. Steep gradient, little fish habitat, corridor fairly stable. Bank erosion along both sides of channel. Upstream erosion has caused minor sedimentation just south of S 133 St. Some localized flooding also occurs. Severe downcutting and in - stream scouring of channel. P:DU.APC C-4 Anticipated Conditions and Problems Water will overtop drainage swale if sediment/silt build- up goes unchecked. Road will have water intrusion also. Road failure is probable. Future development could increase flows to erosive levels, causing sedimenta - at tion. Future development could increase flows and instream erosion. Continued erosion. Future development could in- crease sediment problems in this area. Accelerated erosion will increase. Siltation of conveyance systems will in- crease flooding. Recommendations Increase maintenance of culverts. Problem has been referred to King County Roads Division. • Restrict future development runoff to levels that are nonerosive in the downstream system. Restrict future development runoff to levels that are nonerosive in the downstream system. Resident should be asked to revege- tate bank. Sediment and R/D ponds could be constructed both north and south 110 133 St. Install energy dissipators in stream and vegetate banks where possible. Evaluate at time of basin planning as a habitat project. � Trib. & Collect. Existing Item River Mile Point Category Prop. Proj. Conditions and Problems 22 0003G 23 0003G 24 0003I 27 Hydrology 1306 Incised stream segments. Downstream flooding in Tukwila. City of Tukwila. 26 Hydrology 31 Geology Horse pasture with old farm buildings. City of Tukwila. Landslide in bedrock hollow directly above residence. P:DU.APC C-5 Anticipated Conditions and Problems Accelerated incision along with other adverse stream processes. Continued down- stream flooding in Tukwila. Undersized channels and pipes will back up flows. Continued surface erosion. Possible continued land - sliding (though minor). Recommendations Construct an R/D facility. City of Tukwila should consider an R/D facility for control of flows. - Investigate more thoroughly to determine if cause is stormwater from impervious surfaces above. - Add this section of hillslope to landslide hazard in the SAMF. • • EXHIBIT "E" SENSITIVE AREAS FOLIOS •••'''7;*".;`,„1,11-i7e !!% • 3,--' - : ,.-- .- • •' N ,I ! i . f:h.. .4-- . , .... .,1\....„,,.. . i:.........,.... , 1\ \ :=?---,---:-•-__, -`... - -------- ,,,..--:--..4__.._.... L I 5 1, . r-. ' al) . -- , 1 •-- ' - ,!.,',1:]'!,1, q.) • :f.t.=,.-___- ...--‘,"1-1-ir ...1 ,V- ,•.-42P-7..-;-. - • , ; 4. X, ;..i (•• 11 1 innutial Wm•a ifiwill 1 -111111re limi micarimi. UPuil_ to . .c.:•::,..- mem 1 • _ Em. • iincE ,\ '`aineammillim .... , ...,,„ .,.... , A elle Ea lid r immeairz vag niassnliregrir --f-r1-711.391C 110:41121W. ' 1 A 171 L1 ii., , 11111140 ti telt If TV - ••, . • , :I tl f RV , , ! ;,,,.• 1 I,' Ni i di :! lit AIWA , ‘,.• ,. ki x,..A.A".=3 I",,.:;.! A a01%y 4 : 1A:,i48CrIuC,I NrNinTnNmm oi lillli tilillilitik?"u'Erf: '1 miniansa=-; COAL MINE HAZARD AREAS URC, 1900 KING COUNTY SENSITIVE AREAS FOLIO NORTH 1 fix 0 z U) W IX "Q 0 IX d N U 2 U) W U) 0 J 0 u. H < w F z W )N Z 0 0 0 u z Y 0 11 u re -1_' -; 1 1 ;1 I jJi 19 .! J.4 Ti I ; . ' • 1 MIN c„ I t .;•*-,1 A • .;;!. _ Ar" 4 Le *t ma sm., 11{11.41 • .„...... ..-4. • - -1. - __•,•-...„,...,.. , .,...... - _ ), 1,/ . -... . -... . j, UM siVeltal,an 11111111MINNill ISSEENVITE --N,sww:ANifir Akkheir eye aswir irrimmem 31 INIANIMMERWMT II INNINEEM: 717.11 yv rialaniar." LANDSLIDE HAZARD AREAS /RCM: 1990 KING COUNTY SENSITIVE AREAS FOLIO 25 NORTH r • • • , I" - 7 ; ,;. *t ,i:.•,',7 -D.-7.7 -.• ' '.'---i7t4' -4-' ...,-11 ...':_i : . .: 1....11._ . '. r... . :. , .- t3. -L,.4,--1--.••.4. t;ti"-.6. : r-;‘•,: s•-•'1. 1— ..1\''r. --: •.',.•':, _.1 i 1 !....-•-,-/--- --•-•^1-1- ' —1 . 4 ••01.1 %. ' ' `i I - 1 • j .4( • N• A • \ • -1,- 1 1-**/ ' ; ; Sttr:?‘ 1:1177C • • \-•• . r •i• ip:7, . -,, _4..1' - : .1._ I. ..:•.; ,- : -4 r..• • . , • :' -.• . 17 ', ! ' • A ::-.1 , 1 1. 1 •_ 7..,---4-.. ..,_,., ; t" FT '.. ,9-1-F I : ,.!:::rf :: ,7•.t 4 .1' --1,. I 1: i : T '. • ' :"-' .41+74:---11.-f- --4,11-1741÷—nt.-1t. - - ,:71, -.. f l'• 1 •1 • ; i t i 1-,..• , -4 tu- ;i:--. --• ;. --' .'.,:i2: L -7e..--- J.17' - .1 y '-n . -•,‘; .,R!:0- ,...:-.;._ , i I.• y - __.-...i-7.__-, - • ..),. -• i•L:, ,-ft.. • ..,L,1 ' •-,:4',:,,,ift ::I 1,.1.111-11_,_:-..i !..,..7,- i•- , ---, • , ,'i-:: -1-1-r-if.----' - ,,,,•,. •,,•!.,,,__}.„,, ,..,,_ '4- il4 ' :Th , „....,•;7/11111 -el t" 1 !,...., :)„. -- : ! I El: ' 1 ; 5 I J The boundaries of the sensitive 'PT< clic- MCC: 1990 KING COUNTY SENSITIVE AREAS FOLIO EROSION HAZARD AREAS NORTH 'L IIS ^V a 1 • 6 r_ LT [Ur.. TT' .Lill it; 111.; 11111164111r1 ri 11111N111 4111.4 � ws�rs9 e�lFt•��JaP luui : +��,`' ..tffl�leif;:.II i� Pi =NrE.utiMitaik71 II VI ni r fl -7-0-31fAir AVA AlAnagliej MingirdlgaINENNE tEllffiilliitrill MINIIMPARSARNI i v;l�/i/aI!UC-grrAM�rI rl V1,, '..,Vii: dill liii STREAMS AND 100 YEAR FLOODPLAINS NORTH URCE: 1000 KING COUNTY SENSITIVE AREAS FOLIO • • MCC: 1990 KING COUNTY SENSITIVE AREAS FOLIO WETLANDS NORTH • • EXHIBIT "F" WETLAND INVENTORY MAP • •\ 4191 • • • • EXHIBIT "G" UPSTREAM AREA MAPS XX crs 1 UPSTREAM DRAINAGE P \SITE rtbrE: F16%.) C tkPJ Rkw atrH FR W0Rr- 0tZ SouTH =14y UPOIJ $,/ TER RDFTt_E CHthRAe-TEe-mf..rsc S • 5• Southgate Creek genee Flow Control/ Diversion Structure LEGEND ® CULVERTS CULYE R T --- DITCH/OPEN CHANNEL ROAD SIDE DITCHES CHANNEL WITH RIPARIAN HABITAT BYPASS (constructed by summer '92) Q REACH DESIGNATION APPROXIMATE 25 YR STORM FLOW Sop E Ft.w,'rq SPLrs TW=S9os CutT N is • 14T1rHFww r tF 9-3.0 5 18" DUWAMISH RIVER S. 133RD ST. 487H AVE. S u N INTERURBAN AVE. S. MAPS PROVIDED TO US BY CITY OF TUKWIL1FA City of Tukwila OSOUTHGATE CREEK FISH ENHANCEMENT PROJECT Kramer, Chin & Mayo, Inc. Figure 6 ALTERNATIVE 3 NEW CHANNELS WITH STORM BYPASS I. S 135 St 3 'c V I S 138 St Foster Golf Course O 200 400 800 O 1 2 SCALE: 1• — 400• • LEGEND Ditch/Stream Pipe • Manhole Catch Basin Culvert Drainage Basin Boundary 15-1 Stream Reach Designation For Watercourse Ratings HES RER4 FOSTORIA STORMWATER QUALITY MANAGEMENT PLAN Figure 2. Southgate Creek stream reaches identified for watercourse rating. 4.0 DETENTION AND WATER QUALITY ANALYSIS AND DESIGN 4.0 DETENTION AND WATER QUALITY ANALYSIS AND DESIGN The project's detention system has been sized using the King County Runoff Time Series (KCRTS) method. The design was completed in accordance with the King County Surface Water Design Manual, dated September 1, 1998. These calculations will be shown in this section. The design requirement for this site is considered. Level 1 flow control. Level 1 flow control is designed to control flows at their current level and to maintain peak flows within the capacity of the conveyance system for most storm events. Specifically, Level 1 flow control requires maintaining the pre -developed peak flow rate for a 2 -year and 10 -year runoff event. This site is located in the Southgate Creek Drainage Basin. Other pertinent information needed to size detention studies for this site include: 1. Gravel soils considered to be grass till. 2. The Seatac Regional Scale Factor of 1.0. 3. Pre -developed conditions - grass. 4. Post -development conditions - impervious surface. 5. Contributing basins, both pre- and post-, 0.59 acres. Upon review of the water quality requirements dictated in the 1998 King County Surface Water Design Manual, it was determined that the basic water quality would be the methodology used for treatment of stormwater runoff from this site. The site does not meet the threshold requirements of sensitive lake protection nor regionally significant stream reach treatment areas. 7099.004 [JPJ/sm] • • • Retention/Detention Facility Type of Facility: Detention Vault Facility Length: 40.83 ft Facility Width: 40.83 ft Facility Area: 1667. sq. ft Effective Storage Depth: 3.00 ft Stage 0 Elevation: 10.00 ft Storage Volume: 5002. cu. ft Riser Head: 3.00 ft Riser Diameter: 8.00 inches Number of orifices: 2 Full Head Pipe Orifice # Height Diameter Discharge Diameter (ft) (in) (CFS) (in) 1 0.00 0.91 0.039 2 1.83 0.72 0.015 4.0 Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation (ft) (ft) (cu. ft) (ac -ft) (cfs) (cfs) 0.00 10.00 0. 0.000 0.000 0.00 0.01 10.01 17. 0.000 0.002 0.00 0.02 10.02 33. 0.001 0.003 0.00 0.03 10.03 50. 0.001 0.004 0.00 0.04 10.04 67. 0.002 0.004 0.00 0.05 10.05 83. 0.002 0.005 0.00 0.06 10.06 100. 0.002 0.005 0.00 0.07 10.07 117. 0.003 0.006 0.00 0.08 10.08 133. 0.003 0.006 0.00 0.09 10.09 150. 0.003 0.007 0.00 0.19 10.19 317. 0.007 0.010 0.00 0.29 10.29 484. 0.011 0.012 0.00 0.39 10.39 650. 0.015 0.014 0.00 0.49 10.49 817. 0.019 0.016 0.00 0.59 10.59 984. 0.023 0.017 0.00 0.69 10.69 1150. 0.026 0.018 0.00 0.79 10.79 1317. 0.030 0.020 0.00 0.89 10.89 1484. 0.034 0.021 0.00 0.99 10.99 1651. 0.038 0.022 0.00 1.09 11.09 1817. 0.042 0.023 0.00 1.19 11.19 1984. 0.046 0.024 0.00 1.29 11.29 2151. 0.049 0.025 0.00 1.39 11.39 2318. 0.053 0.026 0.00 1.49 11.49 2484. 0.057 0.027 0.00 1.59 11.59 2651. 0.061 0.028 0.00 1.69 11.69 2818. 0.065 0.029 0.00 1.79 11.79 2985. 0.069 0.030 0.00 1.83 11.83 3051. 0.070 0.030 0.00 1.84 11.84 3068. 0.070 0.030 0.00 1.85 11.85 3085. 0.071 0.031 0.00 1.86 11.86 3101. 0.071 0.032 0.00 1.87 11.87 3118. 0.072 0.033 0.00 • • 1.88 11.88 3135. 0.072 0.034 0.00 1.89 11.89 3151. 0.072 0.034 0.00 1.90 11.90 3168. 0.073 0.034 0.00 2.00 12.00 3335. 0.077 0.037 0.00 2.10 12.10 3501. 0.080 0.040 0.00 2.20 12.20 3668. 0.084 0.042 0.00 2.30 12.30 3835. 0.088 0.044 0.00 2.40 12.40 4002. 0.092 0.045 0.00 2.50 12.50 4168. 0.096 0.047 0.00 2.60 12.60 4335. 0.100 0.048 0.00 2.70 12.70 4502. 0.103 0.050 0.00 2.80 12.80 4668. 0.107 0.051 0.00 2.90 12.90 4835. 0.111 0.053 0.00 3.00 13.00 5002. 0.115 0.054 0.00 3.10 13.10 5169. 0.119 0.261 0.00 3.20 13.20 5335. 0.122 0.637 0.00 3.30 13.30 5502. 0.126 0.979 0.00 3.40 13.40 5669. 0.130 1.120 0.00 3.50 13.50 5836. 0.134 1.250 0.00 3.60 13.60 6002. 0.138 1.360 0.00 3.70 13.70 6169. 0.142 1.470 0.00 3.80 13.80 6336. 0.145 1.570 0.00 3.90 13.90 6503. 0.149 1.660 0.00 4.00 14.00 6669. 0.153 1.750 0.00 4.10 14.10 6836. 0.157 1.830 0.00 4.20 14.20 7003. 0.161 1.910 0.00 4.30 14.30 7169. 0.165 1.990 0.00 4.40 14.40 7336. 0.168 2.060 0.00 4.50 14.50 7503. 0.172 2.130 0.00 4.60 14.60 7670. 0.176 2.200 0.00 4.70 14.70 7836. 0.180 2.260 0.00 4.80 14.80 8003. 0.184 2.330 0.00 4.90 14.90 8170. 0.188 2.390 0.00 5.00 15.00 8337. 0.191 2.450 0.00 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu -Ft) (Ac -Ft) 1 0.28 ******* 0.18 3.06 13.06 5106. 0.117 2 0.14 ******* 0.08 3.01 13.01 5022. 0.115 3 0.15 0.05 0.05 3.00 13.00 5001. 0.115 4 0.15 ******* 0.05 2.78 12.78 4631. 0.106 5 0.17 ******* 0.04 2.30 12.30 3842. 0.088 6 0.09 0.03 0.03 1.83 11.83 3052. 0.070 7 0.15 ******* 0.02 1.16 11.16 1931. 0.044 8 0.13 ******* 0.02 1.08 11.08 1801. 0.041 dev.pks • Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates --- Flow Rate Prob (CFS) 0.143 0.990 0.126 0.960 0.174 0.900 0.147 0.800 0.174 0.667 0.153 0.500 0.214 0.231 0.279 0.091 Computed 0.980 Rank Time of Peak 7 8 3 6 4 5 2 1 Peaks 2/09/01 1/05/02 12/08/02 8/26/04 10/28/04 1/18/06 10/26/06 1/09/08 2:00 16:00 18:00 2:00 16:00 16:00 0:00 6:00 Page 1 • Flow Frequency Analysis-- - - Peaks - - Rank Return (CFS) 0.279 0.214 0.174 0.174 0.153 0.147 0.143 0.126 0.257 Period 1 100.00 2 25.00 3 10.00 4 5.00 5 3.00 6 2.00 7 1.30 8 1.10 50.00 predev.pks • Flow Frequency Analysis Time Series File:predev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates --- Flow Rate Prob (CFS) 0.052 0.990 0.027 0.960 O .067 O .900 O .011 0.800 0.029 0.667 0.054 0.500 O .048 O .231 O .124 O .091 Computed O .980 Rank Time of Peak 4 7 2 8 6 3 5 1 Peaks 2/09/01 1/05/02 2/27/03 8/26/04 1/05/05 1/18/06 11/24/06 1/09/08 2:00 16:00 7:00 2:00 8:00 16:00 3:00 6:00 Page 1 • Flow Frequency Analysis-- - - Peaks - - Rank Return (CFS) 0.124 O .067 0.054 O .052 0.048 0.029 0.027 0.011 O .105 Period 1 100.00 2 25.00 3 10.00 4 5.00 5 3.00 6 2.00 7 1.30 8 1.10 50.00 • • SIZE OF WATER QUALITY VOLUME OF THE WET VAULT Basic wet vault requires a volume factor of 3. Rainfall from the mean annual storm = 0.039 feet from Figure 6.4.1A = R. Calculate runoff from the mean annual storm (VR) for the developed site. VR = (0.9 A; + 0.25 Atg + 0.10 Atf + 0.10 Ao) x R A; = 0.59 acres Atg= 0 Aff = 0 A. = 0 VR = (0.9 (0.59)) x 0.039 = 0.0207 AC FT = 902 CF Vb = wet pond volume =fVR = 3 (902 CF) = 2706 CF 7099.004 [JPJ/sm] 6.4.1 WETPONDS — BASICoD LARGE — METHODS OF ANALYSIS FIGURE 6.4.1.A PRECIPITATION FOR MEAN ANNUAL STORM IN INCHES (FEET) ST 1.0/ LA 1.0 LA 1.2 LA 0.8 LA. 0.9 0.54" (0.045') 0.47" (0.039') i— Incorporated Area ...cltD River/Lake — Major Road 0.47" (0.039') NOTE: Areas east of the eastemmost isopluvial should use 0.65 inches unless rainfall data is available for the location of interest 24 The mean annual storm is a conceptual storm found by dividing the annual precipitation by the total number of storm events per year 0.52" (0.043'b.56" (0.047') result, generates large amounts of runoff. For this application, till soil types include Buckley and bedrock soils, and alluvial and outwash soils that have a seasonally high water table or are underlain at a shallow depth (less than 5 feet) by glacial till. U.S. Soil Conservation Service (SCS) hydrologic soil groups that are classified as till soils include a few B, most C, and all D soils. See Chapter 3 for classification of specific SCS soil types. 1998 Surface Water Design Manual 6-69 9/1/98 • • • K 5.0 CONVEYANCE SYSTEM ANALYSIS AND • DESIGN • • 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN As typical of commercial projects, there is a network of catch basins and conveyance pipes that route water collected from the building and paving areas into a stormwater collection facility. This system will be designed per King County standard requirements for conveyance capacity and velocity. The 25-year/24-hour storm event was used for sizing the pipes. 7099.004 [JPJ/sm] 'xIs JOB NAME JOB#: FILE#: HOT MIX PAVERS 7099 7099-25.XLS A= Contributing Area (Ac) C = Runoff Coefficient Tc = Time of Concentration (min) I= Intensity at Tc (in/hr) d = Diameter of Pipe (in) L= Length of Pipe (ft) D= Water Depth at Qd (in) FROM TO A $ ROOF CB1 0.06 2.00 CB1 CB2 0.21 0.77 CB2 VAULT 0.19 1.20 CB3 VAULT 0.12 BARGHAUSEN CONSULTING ENGINEERS - PIPE FLOW CALCULATOR using the Rational Method & Manning Formula KING COUNTY DESIGN FOR 25 YEAR STORM Qd = Design Flow (cfs) Qf = Full Capacity Flow (cfs) Vd = Velocity at Design Flow (fps) Vf= Velocity at Full Flow (fps) s= Slope of pipe (%) n= Manning Roughness Coefficient Tt= Travel Time at Vd (min) L NOTE: ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING DEFAULTS d Tc n C 55 65 50 0.83 36 4 6.3 0.014 0.9 8 6.6 0.014 0.9 12 7.0 0.014 0.9 8 6.3 0.014 0.9 C= d= 0.9 n= 8 Tc = 0.014 6.3 COEFFICIENTS FOR THE RATIONAL METHOD "Ir" -EQUATION SUM A 0.06 0.272 0.466 0.124 STORM Ar Br 2YR 1.58 0.58 10YR 2.44 0.64 25YR 2.66 0.65 50YR 2.75 0.65 100YR 2.61 0.63 A`C 0.05 0.19 0.17 0.11 SUM A'C I Page 1 0.05 0.24 0.42 0.11 PRECIP= Ar= Br= 3.4 2.66 0.65 Qd 2.73 2.65 2.56 0.15 0.65 1.07 2.73 0.31 Qf Qd/Qf Did D Vf 0.25 0.98 3.62 0.591 0.659 0.296 0.552 2.21 2.87 0.594 4.75 2.82 0.372 4.47 4.62 Vd 2.98 3.01 4.02 1.02 0.299 0.373 2.99 2.93 2.55 • Tt 0.31 0.36 0.21 0.23 • 0 10 20 40 t- � f 1:- — ::=:..I • • GRADING AND STORM DRAINAGE PLAN • ID OP t4—_ W W- — RELOCATE E4. FH 1' BEHIND NEw SIDEWALK P1=13,60.58 EX 20 ROADWAY 5 8.5.8.1 A110 LANDSCAPE S_ EX- POWER -POLE' (TO REUOVED) - r W— — — — 35 LF 3' WIDE CONN. SWALE 0 0.662 PER DC1NL •YI /.001!111 ♦-':, LIi N; ......- ,-Ex. FENCE " (TO BE REMOVED/( 30 DRNCWAY RELOCATED) WITH GA1E . W— 1441•44'574 PSL 366 38 PRIVATE ROAD (VACATED VAC ORD 1168 33 IF 3' WIDE CONC. SWALE 0 0.52 PER DETAIL _. 5' 8.S.6.L AND— LANDSCAPE SETBACK k 5' LANDSCAPE SCREEN (SEE NOTE 0) 30' DROEWAY WITH GATE IE 10.30 , 15 EX. FENCE NEW 6' CURB r 1570 6. I / Y WELIAND BOUNDARY II RITC CATE FEN6 E,C PO -POI[ Ai. `I. SE3B4C0 I (10 TRLTCCAI9B- N`5 CURB 4 P56 .9004 D CURB NG) -• . RI F .DRAIN 0 22 BEHIND .. .. ... 145-.- , 10' HALT -STREET . KAT 0E0059E0 DER CIII OT TUKWILA STANDAR05 _('ACCESS/ COMMERCML ) NEW 6' WIDE 5'DEWOLV (PER CIT, Of TUKWI(A ) 35' STD DV 8511) i 65 LE 8' - 0 0 772 RELOCATE EX: UP • WETLAND BOUNDARY - REDUCED TYPE 2 DUFFER WIDTH REQUIRES SPECIAL CITY APPROVAL AND WETUND BUFFER ENHANCED PUNT IN6S. D. FENCE (TO 12E/049f) 84'720' COMBINED WET/DETENTION VAULT C/L R.O.W. 12.5' lA(:25Ci1PE-5 5' B.S.9.L AND uN. S LANDSCAPE SETBACK 29.71' EX. FENCE (TO REMAIN) LEGEND: PROPOSED TYPE R CATCH BASIN PROPOSED TYPE 1 CATCH BASIN EXISTING TYPE I CATCH BASIN PROPOSED STORM DRAINAGE LINE EXISTING STORM DRAINAGE UNE PROPOSED SANITARY SEWER LINE PROPOSE( SOLITARY SEWER M0,1111010 PROPOSED SANITARY SEWER CLEANOUT EXISTING SANITARY SEWER MANHOLE EXISTING SANITARY SEWER LINE EXISTING WATERMAIN • 0 W IXISTING FIRE HYDRANT EXTS1186 WATER VALVE PROPOSED WATERMAN PROPOSED FIRE HYDRANT • PROPOSED WATER VALVE 44 PROPOSED 5POT ELEVATIONS 232 EXISTING SPOT ELEVATIONS .. EXISTING CONTOURS PROPOSED CONTOURS PROPOSED LIGHT PAVEMENT PROPOSED CONCRETE 400 100 EX POWER POLE (TO REUAIN) RACE POWER POLE DURING CONSTRUCTION IN; IT LEGAL DISCRIPTION: LOTS 6, 7, 8, 9 AND 10, BLOCK 4, ALL IN RIVERTON REPUT OF LOTS 1 TO 5 F00101)A GARDEN TRACTS, ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 13 OF PLATS, PAGE 40, RECORDS OF KING COUNTY, WASHINGTON: EXCEPT THAT PORTION THEREOF CONDEMNED FOR STATE HIGHWAY BY COUNTY OF KING, CITY OF SEATTLE UNDER KING COUNTY AUDITOR'S FILE N0. 618285; EXCEPT THAT PORTION THEREOF CONVEYED TO THE STATE OF WASHINGTON FOR STATE HIGHWAY, BY DEED RECORDED UNDER AUDITOR'S FRE NO.'S 5719585 AND 5738787: TOGETHER WITH THAT PORTION OF VACATED STREET ADJOINING THAT ATTACHED BY OPERATION OF LAW. TAX PARCEL NO.'S 743920-0220, -0225, -0230 AND -0235 BASIS OF BEARINGS: 6.0.AS. VERTICAL DATUM, CITY OF TUKWILA M.S.L. GENERAL SITE DATA: WATER SOURCE: SEWER SOURCE: POWER SOURCE: PHONE SOURCE: NATURAL GAS SOURCE: WD -125 TUKMIIA SEWER SEATTLE CITY LIGHT US WEST COMMUNICATIONS PUGET SOUND ENERGY BOUNDARY AND TOPOGRAPHIC EiVRVEY= BOUNDARY SURVEY BY LUND AND ASSOCIATES SURVEYORS DATED 4-28-09. TOPOGRAPHIC SURVEY BY LUND AND ASSOCIATES DATED 4-24-89. g�v�s�N moiPP. mmm m�� 8 z Q J 0.. Q Z Q cc 0 0 coJ 0 0 0 cc 0 HOT MIX PAVERS 4.400 S.131ST PLACE, TUKWILA HOT MIX PAVERS LL 1122 EAST PIKE STREET #1345 N _N 55 0) O co 0_ vE 2 cnO arcv Q W cn if V x • m i m u11 � Y 8 s u Y o 2 0 6.0 SPECIAL REPORTS AND STUDIES Sep -09-99 03:58P Ron Wright & Associates206) 728-4272 Sen. By: PacHim (leotecnnlcal Inc.; GM) ao� D'►V:,, a, • 2 .v ,•, • PACRTM GEOTECHNICAL INC. (Y.()TfT'.I IN/CAL CNGINEE NG ANI) A14'I I")r/u1T11 qc Ic NC[$ 10700 MP,ki,xn Av(t. N.. Sule 210 • SonNo. WA s)H13.i • PhnnA• t?06) 365.Q, tO • l=ox: Mots/ ac5-8405 September 9, 1999 Parkin Project No. 070-002 Hot Mix Pavers 1.122 East Pike Street Seattle, Washington 98122 Attention: Ms. Anita Westeren Subject: PROPOSED OFFICE BUILDING 4400 Serail 131' PLACE TUKWILA, WASHINGTON Dear Ms. Westercn: Packim Geotechnical inc. (PacRitn) completed a geotechnical engineering study for the above -referenced project. The purpose of the geotechnical study was to explore and evaluate the surface and subsurface conditions at the site, and based on the conditions observed, provide recommendations pertaining to geotechnical aspects of the project. The study was completed in general accordance with the scope of work presented in our proposal dated August 26, 1999, revised to reflect the use of backhoe equipment provided by the owner for exploration purposes, and was verbally authorized by Ms. Anita Westeren on August 27, 1999. Results of the geotechnical study are summarized below. SITE AND PROJECT' DESCRIPTIONS The site is located within the Duwamish Valley, at thc northeast quadrant of the South 131" Place and 44" Place South (formerly Ruth Street) intersection in Tukwila, Washington. The trapezoidal shaped site is approximately one acre in size, about 140 feet wide by 260 to 320 feet long_ It is bounded by South 131' Place and 44'" Place South to the south and west, respectively. The site is also bounded by the Highway 529 on ramp to thc north, and a construction storage yard to thc west (see Figure 1). The site is currently vacant. It is practically level with less than about 1 foot of elevation change across the site. its surface is covered primarily with 5/8 -inch minus crushed rock with scattered grass and blackberry vegetation. It is our understanding that the proposed development includes the construction of a one- story office building to be located on the south side of the site, adjacent to South 131" Place. Two attached garage service bays along the north side of the building are also planned. The service bays will have a concrete slab -on -grade floor, and possibly a below - grade working pit about $ feet deep. The area north of the proposed building will be paved and used as a parking lot. The parking arca will extend to within about 4u tbet of the northern property boundary. P.03 sep-u9-99 03:58P Ron Wright & Associates (206)728-4272 P.04 Sent Sy: PacR1m Geotecnnr.cal. inc.; euo 01:2u vvvv, .+or o ee ... �� . • PacRim Project No. 070-002 September 9, 1999 SUBSURFACE EXPLORATIONS Subsurface conditions at the site were explored by excavating two test pits (TP -1 and TP - 2) within the footprint of the proposed building, to depths ranging from approximately 8 to 10 feet below the present grade. The test pits were located in the field by pacing distances from apparent property corners, and the approximate test pit locations are shown on Figure 1. Two exploratory borings were also drilled at the site during a previous study by others (Altinay, 1996). Results of these exploratory borings were used to supplement our current exploration program. The test pits were excavated with a tracked excavator supplied by ACE Construction under subcontract to the owner. At the completion of the excavation, thc lest pits were backfilled with the excavated soils and tamped with the backhoe bucket. This backfill should not be expected to behave as compacted structural fill and some settling of the ground surface may occur. The test pits were excavated under the full-time observation ofa PacRim geotechnical engineer. Soil samples obtained were classified in the field and representative portions were placed in air -tight, plastic bags. These soil samples were then returned to our laboratory for further examination and to ting. in addition, pertinent information including soil sample depths, stratigraphy, soil engineering characteristics, and groundwater occurrence was recorded. SUBSURFACE CONDITIONS SOILS A surficial layer of 518 -inch minus crushed rock about 6 inches thick mantles the site. Underlying the crushed rock, the test pits encountered a layer of granular fill primarily consisting of sandy gravel, extending to a depth of about 4'/s feet at the two test pit locations. The backhoe operator indicated that 4 to 6 feet of granular 1111 had been placed over the site approximately 10 to 12 years ago. The operator recalled thc fill being placed in lifts and compacted with a roller. The fill density appears to decrease with depth; the upper 3 feet the fill was relatively dense and became medium dense to loose near the base of the fill. Below the fill, soft organic -rich silt was encountered to the maximum depths of explorations at a depth of about 8 to 10 feet. GROUNDWATER Groundwater seepage was observed in the test pits at a depth of about 4yz feet, near the base of the existing fill soils. Exploratory borings completed by others (Altinay, 1996) during a previous geotechnical study indicates presence of groundwater at a depth of about 3 fret. Given the proximity of the site to the Uuwamish River. the groundwater elevation (7O-002 llut Mixt Pavers Report 2 PAdiom t:xnlfruNICAL Lic. V3:5/Sr Kon Wright & Associates _4206) 728-4272 P_05 Sen iiy: racrum UCUICU ,, i. . 1116., cv� .+w ..�.. _._.. . • • Pacltim Project No. 070-002 September 9, 1999 • is anticipated to fluctuate, primarily in response to changes in seasonal precipitation and the level of the river. CONCLUSIONS AND RECOMMENDATIONS SEISMIC CONSIDERATIONS The project site lies within Seismic Zone 3, as defined in Chapter 16, Division IV of the 1997 Uniform Building Code (UBC). Moderate levels of earthquake shaking should be anticipated during the design life of the proposed building, and the structures should be designed to resist earthquake loading in accordance with the methodology described in thc 1997 UBC. Based oa the subsurface conditions observed during our exploration program, UBC Soil Type Sd is appropriate for the design of the proposed structure. Soil liquefaction is a phenomenon wherein saturated soil deposits temporarily lose strength and behave as a liquid in response to earthquake shaking, and is generally limited to submerged, loose granular soils. The results of previous and our current geotechnical explorations indicate that the site soils primarily consist of fine-grained organic soils, and .in our opinion, the potential of soil liquefaction is low. BUILDING FOUNDATIONS Foundation Suppurt In our opinion, conventional isolated or continuous spread footings are suitable for use to support the proposed building. The footings should be proportioned using a maximum allowable bearing pressure of 1,500 pounds per square foot (psf). The recommended maximum allowable bearing pressure may be increased by 1/3 for short-term transicnt conditions such as wind and seismic loading. We recommend a minimum footing width of 24 inchta for both continuous strip and isolated column footings. It should be noted that, due to the presence of compressible organic soils directly below the granular fill, long -teen settlement should be anticipated. To reduce thc potential post. construction settlement, the proposed footings should be founded at an elevation as high as feasible. k is our opinion that the footing should be embedded 12 inches below the finish grade, which will result in about 3 to 3 Y. feet of granular fill soils remaining below the bottom of the footings. Assuming construction is accomplished as recommended herein, and for the foundation loads anticipated, we estimate total long-term settlement of spread foundations to be about 1 to 2 -inches, and differential settlement between two adjacent load-bearing components supported on competent soil of less than about 1 inch. 070-002 Hol Mix Pavers Report 3 PaGRlM GCUYs.CMhiCni. jive. Sep -09-99 03:59P Ron Wright & Associates Sent by: racHlm cueotecnnicai Lin:., „�.4 ywy� • 206) 728-4272 P.06 • • Pacitim Project No. 070-002 September 9. 1999 Lateral Load Resistance Wind. earthquakes, and unbalanced earth loads will subject the proposed structure to Lateral forces. Lateral forces on a structure will be resisted by a combination of sliding resistance of its base or footing on the underlying soil and passive earth pressure against the buried portions of the structure. For use in design, a coefficient of friction of 0.5 may be assumed along the interface between the base of the footing and subgrade soils. Passive earth pressure for buried portions of structures may bc calculated using an equivalent fluid weight of 500 pounds pez cubic foot (pci), assuming footings are cast against dense structural MI. The recommended coefficient of friction and passive earth pressure values do nor include a safety factor. The passive resistance should he neglected unless the area is ptotected by pavement or slabs on grade. Foundation Excavations All footing excavations should be trimmed neat and the bottom of the excavation should bc carefully prepared. All loose or softened soil should bc removed from the footing excavation prior to placing reinforcing steel bars. We recommend that footing excavations be observed by the geotechnical engineer prior to placing steel and concrete, to verify that the recommendations of this report have been followed, and that an appropriate bearing stratum has been exposed. if footing excavations are open during the winter season or periods of wet weather, it may be helpful to provide a lean concrete mat or a layer of gravel to help preserve the subgrade until the footings are cast. If lean concrete is used, a 2 -sack mix is recommended. If gravel is used to protect the footing subgrade, it should meet the gradation requirements for Class A Gravel Backfill for Foundations. as described in Section 9-03.12(1)A of the 1998 WSDOT Standard Specifications. Footing Drains The outside edge of all perimeter footings should be provided with a drainage system consisting of4-inch diameter, perforated, rigid plastic pipe embedded in a clean. free - draining sand and gravel meeting the requirements of Section 9-03.12(4) of the 1998 WSDOT Standard Specifications for Gravel Backfill for Drains. The use of flexible, thin- walled, corrugated plastic pipc should be avoided. The drainpipe and surrounding drain rock should be wrapped in non -woven geotextile (Mirafi 140N, or approved equivalent) to reduce the potential for clogging and/or ground loss due to piping. Water collected from the footing drains should be directed into the local storm drain system or other suitable outlet. Down spouts and roof drains should fol be connected to the foundation drains in order to reduce the potential for clogging. The footing drains should include clean -outs to allow periodic maintenance and inspection. 070-002 Not Mixt Pavers Report 4 PAcR1M GLoirC11..TCAI. INC. Sep -09-99 03:59P Ron Wright & Associates (206� 28-4272 P_07 Sent ey: racnim ueotecrun.cei ��. ..� _7..., • • PacRim Project No. 070-002 September 9, 1999 Grades around the proposed structures should be sloped such that surface water drains away from the building. Roof drain discharge should not be placed immediately adjacent to footings. If roof drain spouts discharge water onto splash blocks, the splash blocks should bc situated at least 3 feet away from the building line. Alternatively, roof drains could bc tight -lined to the Local storm drain system or other appropriate outlet. BELOW-ClRADE WORKING PITS It is our understanding that a below -grade working pit may be constructed as part of the service bays. The working pit is anticipated to be about 5 fect deep. As such, submerged soft organic rich soils may bc encountercd near the bottom of the excavations. When encountered, the soft soils should be partially overexcavated. The depth of overexcavation should bc limited to about one foot, and replaced with CSRC underlain by a gcotextile separator. The gcotextile separator should bc Mintfr 140N, or approved equivalent. Below -grade pit walls should be considered rigid and designed for an at -rest earth pressure of 55 pef. In our experience, walls designed for at -rest earth pressures typically exhibit adequate factors of safety for seismic loading. In addition. surcharge pressure resulting from heavy trucks should also be incorporated into the design of the walls. The surcharge pressure should be computed using a lateral pressure coefficient of 0.4. The recommended carth pressures assume that the backfill behind the wall will consist of properly compacted granular fill. We recommend wall backfill material be consist of Grave! Backfill for Walls (WSDOT 9-03.12(2)), or Gravel Borrow (WSDOT 9-03.14), as described in the 1998 WSDOT Standard Specifications. CONCRETE SLABS -ON -GRADE Preparation of areas beneath concrete slab -on -grade floors should be performed as recommended in the Subgrade Preparation scclion, below. Prior to constructing concrete slabs -on -grade, surficial soils should be scarified to a minimum depth of 8 inches. moisture conditioned to within about 3 percent of optimum moisture content, and compacted to at least 95 percent MDD, determined using ASTM D 1557 (Modified Proctor). Scarification and compaction will not be required if floor slabs arc placed directly on recently placed compacted fill. Interior slab -on -grade floors should be provided with an adequate moisture break. The capillary break material should consist of a minimum of 6 inches of free -draining, crushed rock or well -graded sand and gravel compacted to at least 95 percent MDD. The capillary break material should have a maximum particle size of% inch, with no more than 80 percent passing the No. 4 sieve and less than 5 percent fines (material passing the U.S. Standard No. 200 sieve). In areas where moisture will be detrimental to floor coverings or equipment inside the proposed structures, a 10 -mil polyethylene vapor barrier should be placed directly over the capillary break. An approximately 2 -inch thick layer of sand 070-002 Hot Mix Pavers Repon 5 P..crt►M ckont 000kt. IP'(. •� - 1 I mon wrlgrit Sen- t3y: racriim ueotecnnical jriu,, • PacRim Project No. O-002 September 9, 1999 & Associates cvu 206)728-4272 P_08 • should be placed over the vapor barrier to protect it from damage, to aid in curing of the concrete, and also to help prevent cement from bleeding down into the underlying capillary break materials. The concrete slab -on -grade floor in the garage service bays will be subjected to heavy truck loading. These the slabs should be underlain by a minimum of 9 inches of Crashed Surfacing Base Course (CSBS), in lieu of the capillary break material discussed above. The CSl3C should conform to the requirements of Section 9-03.9(3) of the 1998 WSDOT Standard Specifications. The concrete slab can be constructed directly on the CSBC. SITE EARTHWORK Suhgrade Preparation Subgrade preparation in areas supporting the new building should begin with the removal of alt deleterious matter and vegetation. Exposed subgrade soils should then be evaluated by the geotechnical engineer. For Large areas, this evaluation should be performed by proof -rolling the exposed subgrade with a fully loaded dump truck. For smaller areas where access is restrict4 the suhgradc should be evaluated by probing the soil with a steel probe. Soft/loose soils identified during subgradc preparation should be compacted to a firm and unyielding condition or over -excavated and replaced with imported structural 611, as described below. The depth ofuverexcavatioti, where required, should be evaluated by a qualified geotechnical engineer at the time of construction. Stjuctaral Fill Materials and Conspactian It is our opinion that the existing on-site fill soils (the upper 4 feet) is suitable for re -use ac structural fill. If additional imported structural fill is required it should meet the requirements for Gravel Borrow, as described in Section 9-03.14(1) of the 1998 WSDOT Standard Specifications far Road. Bridge, and Municipal Construction (WSDOT Standard Specifications). Soils with fines contents higher than 7 percent may be acceptable if the earthwork is performed during dry weather and the contractor's methods are conducive to proper compaction of the soil. The use of materials with a fines content in excess of 7 percent should be evaluated by the engineer on a case-by-case basis. Structural 611 soils should be moisture conditioned to within about 3 percent of optimum moisture content, placed in loose, horizontal lifts less than 8 inches in thickness, and compacted to at least 95 percent of the maximum dry density (MDD), as determined using test method ASTM D 1557 (Modified Proctor). Compaction of backfill material placed adjacent to below -grade walls should be accomplished using relatively light equipment so that excessive lateral pressure is not transmitted to the wall. A relative compaction requirement of 90 percent MDD is considered adequate for backfill placed within a horizontal distance of 5 feet from below -grade walls. 070-002 Hot Mix t'avca Rcpott 6 PACRTM CCU' LC1INrCAL L' c. ae -uy-y5 U.S 5F• Ron Wright & Associates4206) 728-4272 p_09 Senttsy: rectum ueonecnrllctll itie. cuu vu.r v+vv, ..... " 1 • • • PacRim Project No. 070-002 September 9, 1999 The procedure to achieve the specified minimum relative compaction depends on the size and type of compacting equipment, the number of passes, thickness of the layer being compacted, and certain soil properties. When size of the excavation restricts the use of heavy equipment, smaller equipment can be used, but thc soil must be placed in thin enough lifts to achieve the required compaction. A sufficient number of in-place density tests should be performed as the fill is placed to verify the required relative compaction is being achieved. Generally, loosely compacted soils are a result of poor construction technique or improper moisture content. Soils with a high percentage of silt or clay are particularly susceptible to becoming too wet, and eoaru:.•grained materials easily become too dry, for proper compaction. Silty or clayey soils with a moisture content ton high for adequate compaction should be dried as necessary, or moisture conditioned by mixing with drier materials, or other methods. Wet Weather Earthwork in general, earthwork is more readily and economically performed during dry weather conditions. The subgrade soils could become saturated and spongy due to rain and/or construction traffic. In such an event, soft soils should be removed from the area. imported sand and gravel meeting thc gradation specification described above should be placed to bring the affected area to proposed grade. General recommendations relative to earthwork performed in wet weather or in wet conditions are presented below. • The on-site soils are moisture sensitive and may be difficult to handle or traverse with construction equipment during periods of wet weather. Earthwork is typically most economical when performed under dry weather conditions. if earthwork is to be performed or fill is to be placed in wet weather or under wet conditions when soil moisture content is difficult to control, the following recommendations should be incorporated into the contract specifications. • Earthwork should be performed in small areas to minimize exposure to wet weather. Excavation or thc removal of unsuitable soils should be followed promptly by the placement and cornpaction of clean structural fill. The size and type of construction equipment used may have to be limited to prevent soil disturbance. Under some circumstances, it may be necessary to excavate soils with a backhoe to minimize subgrade disturbance caused byequipment traffic; • The ground surface within the construction area should be graded to promote run- off of surface water and to prevent the ponding of water; • Material used as structural fill should consist of clean, granular soil containing less than $ percent fines. The fines should be non -plastic; 070-002 Hut Mix Pave s Report 7 p*CRJM GrtsncnriCxl. INC. yep-U�-yS o4:OOP Ron Wright & Associates OCH1 Or. rpl.nynl u atoLvV1111140.L CVY VUJ VY VJ� l'accRim Project No. 0T0-002 September 9. 1999 20P) 728-4272 %./G -.7-au- v. VVI MI, P. 10 1 aye nt 1 c • The ground surface within the construction area should be sealed by a srnooth drum vibratory roller, or equivalent, and under no circumstances should be left uncotnpacted and exposed to moisture. Soils which become too wet for compaction should be removed and replaced with clean granular materials; • Excavation and placement of fill should he observed by the geotechnical engineer to verify that all unsuitable materials are removed and suitable compaction and site drainage is achieved; and • Rales of straw and/or geotextile silt fences should be strategically located to control erosion. Drainage and Erosion Control Adequate drainage provisions are imperative and we recommend hoth short and long-term drainage measures be incorporated into the project design and construction. Surface ru.noffcan be controlled during construction by careful grading practices. Typically. this includes the construction of shallow, upgrade perimeter ditches or low earthen berms and the use of temporary sumps to collect runoff and prevent water from darnaging exposed subgrades. All collected water should be directed under control to a positive and permanent discharge system, such as a storm sewer. Permanent control of surface water should be incorporated in the final grading design. Water should not be allowed to pond immediately adjacent to buildings or paved areas. All drainage should be directed into conduits which carry runoff away from the building and paved areas into storm drain systems or other appropriate outlets. UNCERTAINTIES AND LIMITATIONS We have prepared this report for Hot Mix Pavers and their consultants for use in design of this project only. This report should be provided in its entirety. to prospective contractors for bidding and estimating purposes; however, the conclusions and interpretations presented in this report should not be construed as a warranty of the subsurface conditions. Experience has shown that soil and groundwater conditions can vary significantly over small distances. inconsistent conditions can occur between explorations that may not bc detected by a geotechnical study. If, during future site operations, subsurface conditions arc encountered which vary appreciably from those described herein, PaeRim should be notified for review of the recommendations of this report, and revision of such if necessary. We recommend that PaeRim be retained to review the plans and specifications and verify that our recommendations have been interpreted and implemented as intended. Sufficient geotechnical monitoring, testing and consultation should bc provided during construction to confine that the conditions encountered are consistent with those indicated by explorations. Recommendations for design changes will be provided should conditions 070-002 Hot Mix Pavers Report f'wrRiuf Gtoty uNIC,L ane. Sep -09-99 04s00P Ron Wright Dena tfy; rqunim uvuLeufliu J. • & Associates LVV VV.. y,v.i, �v(206) 728-4272 P.11 • • PacRim Project No. 070-002 September 9, 1999 revealed during construction differ from those anticipated, and to verify that the geotechnical aspects of construction comply with the contract plans and specifications. Within the limitations of scope. schedule and budget. PacRim attempted to execute these services in accordance with generally accepted professional principles and practices in the fields of geotechnical engineering and engineering geology at the time the report was prepared. No warranty. exrire_ss nr implied, is made. The scope of our work did not include environmental assessments or evaluations regarding the presence or absence of wetlands or hazardous or toxic substances in the soil, surface water, or groundwater at this site. 0'0 We appreciate the opportunity to be of service. Sincerely, PACRIM GEOTECIINICAL INC. L -11 011ST1.ji1 + 1� Scott L. Hardman. P.E. Senior Geotechnical Engineer Enclosure: Figure 1. Site and Exploration Plan Copy: (1) Ron Wright, Architect (via fax) 070-002 11pa Mix Pavcrs Repoli Harbans L. Chabra, P.E. President 9 P.CR7M b OTICIINifw1. t'.(. u4:uur Kon Wright & Associates (206) 728-4272 P_ 12 Sentby: rac im ueoteeoonitau. Lott:., cvar .�v.+ ..+�.., �� - •�...„� • PacRim Project No. 070=002 September 9, 1999 REFERENCES Altinay and Associates, Inc. 1996, Engineering Report for The Property Located at 4400 S. 13 Place in Tukwila, consultant report prepared for Tcd Jorve, datcd July 18. Washington State Department of Transportation/American Public Works Association, 1998, Standard Specifications for Road, Bridges, and Municipal Construction. 070-002 Hot Mia P4vels Report 10 MACRO ULM'EC1aNirAt.IN�'. N n N CO 0• 0 ion Mfgv A •f NO SCALE i 1 1 i . :1 I loa • .: e APPRo w114A7 TgT AST �.i�AT1Ml r '•-•- _~^•_•r��i� .��, ��.s�_ _-_i.1 ^ter. �. ;� : �M.r. _ -�� - _ --_ _i. :L� _•.. - mime ROAD/ .ia�Frr f VAC*Q♦� ' 6f) ' �• t J � r.san •�..1• �i r�0l w 1..% �►is ` u �� ( `� �- . - • w-tirop do , 21 PAMPAS ICSAINIA WId Is dud d Wu" IONll N!) ISM. . Om MQ�ad.wmw 11.11 1•0• w1n : AM del 1111 lEs7 Prr MIttrtiaAlSixeln . I Ir . 1 PacRIm Geotechnical Geoledhnical Engineering and Appied Earth Sciences PROPOSED OFFICE BUILDING 4400 SOUTH 131ST PLACE, TUKWILA. WASHINGTON HOT MIX PAVERS FIGURE 1 SITE MD £XPLORA?I0N PLAN &pied No. 070-002 0 Wet/a#d?erces,/#c. / Delineation / Mitigation / Restoration / H1bitat Creation / Permit Assistance • 70 r 9505 19th Avenue S.E. Suite 106 Everett, Washington 98208 (425) 337-3174 Fax (425) 337-3045 WETLAND DELINEATION REPORT AND BUFFER ENHANCEMENT PLAN FOR HOT MIX PAVERS TUKWILA, WA WETLAND RESOURCES, INC. PROJECT #99123 Prepared By: Wetland Resources, Inc. 9505 19th Street SE, Suite 106 Everett, WA 98208 (425.) 337-3174 for Hot Mix Pavers Attn: Anita Westeren 1122 East Pike St., Suite 1345 Seattle, WA 98122 July 12, 1999 PROJECT SITE DESCRIPTION A site investigation was completed by Wetland Resources, Inc., in June of 1999 to locate jurisdictional wetlands on the Hot Mix Pavers site. This approximate one acre site is located west of SR 599, east of 42nd Ave. South, and South of 130th St in Tukwila, Washington. The property is located in the northeast portion of Section 15, Township 23 North, Range 5 East, W.M. No structures are currently present on the site. To the north and south existing light office/warehouse and commercial land use operations are occurring. Historically the site has been filled and graded as evidenced by virtually level topography and the limited growth of pioneer vegetation. Near the eastern property boundary the fill material drops steeply to a wetland area dominated by reed canarygrass. Hydrology within this area appears to be supplied by a combination of run-off from the on-site fill material and SR 599 to the east. Himalayan blackberry and Scot's broom dominate fill side slopes. An emergent wetland lies between SR 599 and the filled portion of the site and extends off-site to the north. The total wetland area (on and off-site) is greater than one acre in size and the primary vegetation type (greater than 30 percent coverage) is emergent. The wetland is located in a depressional area surrounded by historic fill associated with the adjacent roadways and existing on-site fill and grading. A significant amount of disturbance has occurred within the wetland in the past as indicated by its uneven topography, location between two areas of historic fill, and dominance of reed canarygrass. TMC 18.45.020 classifies wetlands with the aforementioned characteristics as Type 2 wetlands. The City of Tukwila typically designates 50 foot buffers adjacent to Type 2 wetlands. BUFFER ENHANCEMENT PLAN As part of the development proposal a 50 percent buffer reduction is proposed along the entire length of the wetland buffer. Currently this portion of the buffer is dominated by sparsely vegetated filled areas that provide little in terms of wildlife function. As mitigation for this reduction, the remaining portion of the wetland buffer along the western edge of the wetland will be enhanced through the removal of exotic, invasive vegetation, followed by planting several species of native trees and shrubs. Prior to planting, all invasive plants within the enhancement area, namely Himalayan blackberry, Scot's broom, and reed canarygrass, are to be removed, including both the above ground and below ground portions; Existin�naJtive trees and shrubs will remain. The minimum proposed buffer width is 25 feet. Plantings are to be arranged in a random fashion so as to best resemble natural establishment. 60 percent of the total enhancement area will be planted with trees on 10 foot centers, 40 percent will be planted with shrubs on 5 foot centers. Please refer to the Mitigation Plan Map for the proposed location of the buffer enhancement area. Listed below are the species, sizes, spacings and numbers as planting specifications for this area: 1 Common Name Red alder Douglas fir Western hemlock Big -leaf maple Bitter cherry Vine maple Osoberry Red elderberry Oregon grape Swordfern Latin Name Alnus rubra Pseudotsuga menziesii Tsuga heterophylla Acer macrophyllum Prunus emarginata Acer circinatum Oemleria cerasiformis Sambucus racemosa Berberis nervosa Polystichum munitum Plant Size Spacing 2 gal 10' 2 gal 10' 2 gal 10' 2 gal 10' 2 gal 10' 1 gal 5' 1 gal 5' 1 gal 5' 1 gal 5' 1 gal 5' ENVIRONMENTAL GOALS AND OBJECTIVES Numbers 5 5 5 5 5 15 15 15 10 10 The goal of this buffer enhancement plan is to enhance the existing resource function of the wetland/buffer system located on the subject property. System benefits will include: • Enhanced Wildlife Habitat • Improved Water Quality • Improved. Wetland Protection • A minimum 80% survival of the planted species with a maximum of 25% invasives is considered a base line for a successful determination for this mitigation project. PROJECT MONITORING PROGRAM Requirements for monitoring project: 1. Initial compliance report 2. Yearly site inspections (twice yearly, spring and late summer / early fall) for five years 3. Annual reports (one report submitted in the fall of each monitored year) The purpose for monitoring this buffer enhancement project shall be to evaluate the success of the mitigation. Specific elements of monitoring include evaluating plant survival, and control of invasive species. Success will be determined if monitoring shows that at the end of five years, the definitions of success stated below are being met and that habitat functions and values in the buffer enhancement areas are equivalent to similar ecosystems in the immediate area. The property owner(s) shall grant access to the mitigation areas for inspection and maintenance to the contracted wetland specialist and to the City of Tukwila during the period of the assurance device, or until the project is evaluated as successful. Maintenance - The mitigation areas shall be maintained in April and June of each year for the five year monitoring period. Maintenance of invasive species will be essential for successful completion of this mitigation project. Maintenance shall include, but not be limited to, the removal of competing grasses and non-native vegetation (by hand if necessary), fertilization (if necessary), replacement of plant mortality, and the 2 replacement of mulch for each maintenance period. It is likely that irrigation will be necessary within the buffer enhancement area. Criteria For Success: Upon completion of the mitigation project, an inspection by Wetland Resources, Inc. will be made to determine plan compliance. A compliance report will be supplied to the City of Tukwila within 30 days after the completion of planting. Condition monitoring of the plantings and wildlife usage will be done by a qualified wetland biologist twice annually. A written report describing the monitoring results shall be. submitted to the City of Tukwila once yearly in the fall of each monitored year. Final inspection shall occur five years after completion of this project. The approved wetland inspector shall prepare a report as to the success of the project. Definition of Success: Vegetation - The mitigation areas shall support at least 80% survival of the native plants set forth in the approved Buffer Enhancement Plan by the end of five years. Permanent transects and permanent photo site locations will be established for this monitoring project. The species mix should resemble that proposed in the planting plans, but strict adherence to obtaining all of the species shall not be a criteria for success. Minor species substitution will be allowed with approval by the City of Tukwila's Urban Environmentalist and the Consulting Biologist. By the end of the third growing season, the percent coverage, defined by total coverage of planted as well as existing and volunteer native species, shall be 80% for all areas. If an area contains more than 25% exotic species (non-native species) then the mitigation shall not be considered successful for that area. Wildlife - Bird, mammal, amphibian and fish diversity and abundance will be an indicator of wildlife habitat diversity. Species density and abundance shall be comparable to that found in similar stream/upland areas in the immediate vicinity. Published results from other wildlife studies in the region may be used. Visual surveys are sufficient. PROJECT NOTES Plant in the early spring or late fall, preferably during a period of significant precipitation. Order plants from a reputable nursery. Care and handling of plant materials is extremely important to the overall success of the project. All plant materials recommended in this plan should be available from local and regional sources, depending on seasonal demand. Some limited species substitution may be allowed, only with the agreement of the consulting wetland specialist. Each planting hole shall be over -excavated by 100% of the root ball size, horizontally around the root ball, and to a depth equal to the height from the bottom of the root ball to the root collar, and backfilled with native soil material. 3 • • Wood chips or shavings (composted mulch) shall be used for mulching in all planting areas. All existing vegetation is to be removed from a two foot diameter area at each planting site. Wood chips/shavings (composted mulch) are to be placed in this two foot diameter area at a depth of six inches with a two inch spacing around the base of the leader/stems of trees and shrubs. One and one half foot by two inch by 1/4 inch lath stakes shall be placed next to each tree and shrub planted to assist in locating the plants while removing the competing non- native vegetation and to assist in monitoring the plantings. There will be pre- and post -construction meetings on-site between the applicant, consulting wetland specialist, equipment operator(s), and City Biologist. A certified wetland specialist shall be present to inspect the plants prior to planting. Minor adjustments to the original design may be required prior to and during construction. CONTINGENCY PLAN If during any of the inspections, 20% of the plants are severely stressed, or it appears 20% may not survive, additional plantings of the same species may be added to the planting area. If this situation persists into the next inspection, a meeting with the City of Tukwila, the consulting wetland biologist, and the property owner will be scheduled to decide upon contingency plans. Elements of a contingency plan may include, but will not be limited to: more aggressive weed control, mulching, replanting with larger plant material, species substitution, fertilization, soil amendments, and/or irrigation, and reevaluation of species mix. GROUND COVER SEEDING All areas of disturbance and creation shall be seeded to the certified ground cover seed mixtures listed below. Similar native seed mixes are acceptable, upon approval of the consulting wetland professional. Due to sensitivity of the surrounding systems, fertilizer shall not be used. If deemed necessary by the consulting wetland professional and/or the City Biologist, a fertilizer such as 10-20-20 shall be applied at 400 pounds per acre. BUFFER GRASS SEED MIXTURE Common Name Scientific Name lbs. per acre lbs per 1,000 s.f. Redtop Agrostis gigantea 38 0.8 Perennial ryegrass Lolium perenne 36 0.6 Alaska brome Bromus sitchensis 16 0.4 Red Clover Trifolium pratense 16 0.4 4 PERFORMANCE BONDING A performance bond for the planted species shall be provided to the City of Tukwila for the period of five years from the completion of the project, in an amount to be determined by the City of Tukwila. This bond shall be released at the end of five years, upon a "successful determination" and approval by the City of Tukwila for all portions of this mitigation project. The definitions of success shall be as described under PROJECT MONITORING PROGRAM on this plan. TOTAL QUANTITY OF 2 GALLON PLANTS 25 TOTAL QUANTITY OF 1 GALLON PLANTS 65 ESTIMATED COST OF MATERIAL AND LABOR $1,000.00 ESTIMATED COST OF MONITORING (3 YEARS @ $5/yr.) $1,500.00 WETLAND CLASSIFICATIONS - COWARDIN SYSTEM According to the Cowardin System, as described in Classification of Wetlands and Deepwater Habitats of the United States, the on-site wetland, stream, and relic ditches are classified as follows. Wetland: Palustrine, Emergent Wetland, Persistent, Seasonally Flooded. WETLAND CLASSIFICATIONS - CITY OF TUKWILA Under the City of Tukwila Zoning Code, 18.45, the on-site wetland and stream are classified as follows. On-site Wetland Type 2 Wetland: This wetland is greater than one acre in size and is dominated by emergent vegetation. Type 2 Wetlands are designated 50 foot protective buffers from their flagged boundaries. WETLAND DETERMINATION REPORT Methodology On site, routine methodology as described in the Washington State Wetlands Identification and Delineation Manual (Washington State Department of Ecology Publication #96-94, March 1997), was used for this determination, as required by Tukwila during the permitting process. Under this method, the process for making a wetland determination is based on three sequential steps: 5 1) Examination of the site for hydrophytic vegetation (species present and percentage cover). 2) If hydrophytic vegetation is found, then the presence of hydric soils is determined. 3) Determination of the presence of wetland hydrology in the area examined under the first two steps. Vegetation Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydrophytic vegetation as the sum total of macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation produce permanently or periodically saturated soils of sufficient duration to exert a controlling influence on the plant species present. One of the most common indicators for hydrophytic vegetation is when more than 50 percent of a plant community consists of species rated "Facultative" and wetter on lists of plant species that occur in wetlands. Soil Criteria and Mapped Description The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydric soils as those that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part. Field indicators are used for determining whether a given soil meets the definition and criteria for hydric soils. The soils underlying the site are were not mapped in the Soil Survey of King County Area Washington because of limited work conducted by the Soil Conservation Service in the more urban areas of King County. Hydrology Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, states that "areas which are seasonally inundated and/or saturated to the surface for a consecutive number of days greater than or equal to 12.5% of the growing season are wetlands, provided the soil and vegetation parameters are met. Areas inundated or saturated between 5 and 12.5% of the growing season in most years may or may not be wetlands. Areas saturated to the surface for less than 5% of the growing season are non - wetlands." Field indicators are used for determining whether wetland hydrology parameters are met. Boundary Determination Findings On-site Wetland: The on-site wetland dominated mainly by emergent vegetation with the exception of small patches of native pioneer species on the northern property boundary. Emergent 6 vegetation is comprised almost entirely of reed canarygrass (Phalaris arundinacea, FacW). The patches of pioneer shrubs and sapling trees are dominated by red alder (Alnus rubra, Fac), black cottonwood (Populus balsamifera, FacW), and willows (Salix, sp., Fac-FacW). The dominance of species rated "facultative" and wetter indicates that a hydrophytic vegetation community is present in the areas mapped as wetland. The soils within the wetland area are dark gray (10YR 2/1) in color from the surface to greater than eighteen inches below. The soils were saturated at the time of investigation and an organic silt loam in texture. It appears that the area mapped as wetland is flooded, ponded, or saturated long enough during the growing season to develop anaerobic conditions in the upper part of the soils. The majority of the on-site wetland area was saturated to, or very near, the surface at the time of investigation. The wetland area appears to be saturated to the surface for a consecutive number of days greater than or equal to 12.5% of the growing season, thereby meeting the criteria for wetland hydrology. It appears that vegetation, soil, and hydrologic criteria are all met for the on-site portion of this wetland. Non -Wetland Areas: Vegetation in the non -wetland portions of the property is dominated mainly by Himalayan blackberry (Rubus discolor, FacU), Scot's broom (Cytisus scoparius, NI), and sapling black cottonwood (Populus balsamifera, FacW). The lack of dominance of species rated "facultative" and wetter indicates that a hydrophytic vegetation community is not present in the areas mapped as non -wetland. The soils in the non -wetland portions of the site are colored dark grayish brown (10YR 4/2) from the surface to eighteen inches below. No, to very few, redoximorphic features were identified. Due to the depth and compaction of fill material on much of the site, soil color and textures were difficult to obtain. The profile was slightly moist to dry at the time of investigation. Soils sampled in the areas mapped as non -wetland do not appear to be flooded, ponded, or saturated long enough during the growing season to develop anaerobic conditions in the upper part, and therefore do not appear to meet wetland soils criteria. There were no surface indicators of saturation or inundation in the non -wetland areas. It appears that the areas mapped as non -wetland are not saturated for a period greater than 5% of the growing season and therefore do not meet the wetland hydrology criteria. Because direct hydrologic indicators are Iacking, and neither hydric soils nor hydrophytic vegetation dominated in these areas, it appears that these areas do not meet criteria for wetlands. 7 WETLAND FUNCTIONS AND VALUES Methodology The methodology for this functions and values assessment is based on professional opinion developed through past field analyses and interpretation. This assessment pertains specifically to the on-site wetlands, but is typical for assessments of similar systems common to Western Washington. Functions and Values Components Wetlands in Western Washington perform a variety of ecosystem functions. Included among the most important functions provided by wetlands are stormwater control, water quality improvement, fish and wildlife habitat, aesthetic value, recreational opportunities, and education. The most commonly assessed functions and their descriptions are listed below. Assessments of these functions for the project site are provided in the "Analysis" section of this report. Stormwater Storage/Floodflow Attenuation Wetlands often function as natural water storage areas during periods of precipitation and flooding. By storing water that otherwise might be channeled into open flow systems, wetlands can attenuate or modify potentially damaging effects of storm events, reducing erosion and peak flows to downstream systems. Additionally, the soils underlying wetlands are often less permeable, providing long-term storage of stormwater or floodflow and controlling baseflows of downstream systems. Stormwater storage capacity and floodflow attenuation are generally a function of the size of the wetland and their topographic characteristics. Water Quality Surface water quality improvement is another evaluated function. Surface runoff during periods of precipitation increases the potential for sediments and pollutants to enter surface water. Wetlands improve water quality by acting as filters as water passes through them, trapping sediments and pollutants from surface water. Ponded areas within depressional wetlands also allow sediments to drop out of suspension, thereby improving water quality. As development increases, the potential for polluted water to reach wetlands and streams also increases. Unnaturally high inputs of pollutants, which are often found in urbanized areas, along with the size of the wetlands and the vegetation structure within them are the main limiting factors of this function. Wildlife Habitat Wetlands have potential to provide diverse habitat for aquatic, terrestrial, and avian species for nesting, rearing, resting, cover, and foraging. Wildlife species are commonly dependent upon a variety of intermingled habitat types, including wetlands, adjacent uplands, large bodies of water, and movement corridors between them. Human intrusion, including development within and adjacent to 8 wetlands, and impacts to movement corridors are the most limiting factors for wildlife habitat functions. Analysis On-site Wetland Stormwater Storage/Floodflow Attenuation Off-site portions of the wetland are within the 100 year floodplain of the Southgate Creek. The wetland has potential to provide floodflow attenuation during Large flood events as well as slowing stormwater moving into this drainage. It provides limited groundwater recharge because the soils underlying most of the wetland have low permeability. The wetland provides recharge to Southgate Creek and contributes a modest amount of hydrology to the Duwamish River. Water Quality The on-site wetland has the potential to provide water quality improvement functions prior to water entering the downstream watershed. The emergent vegetation within the wetland provides a high level of nutrient uptake, but is limited in the settling of suspended solids. Overall this system has a moderate potential for water quality improvement based on its location in a developed watershed. Wildlife Habitat The on-site wetland and its buffer have limited potential to provide habitat for some wildlife species such as birds and small mammals. The presence of forested areas near the wetland contributes to the wildlife habitat potential of this wetland. WILDLIFE The following species of wildlife were observed on site during the site investigation: common crow (Corvus brachyrhynchos), dark -eyed junco (Junco oreganus), black - capped chickadee (Parus atricapillus), and song sparrow (Melospiza melodia). Many more avian species are expected to inhabit the area during the breeding season. A variety of amphibians are expected to use the wetland and Southgate Creek. No mammals were observed during our site investigation, however, a variety of mammals are expected to use the site. USE OF THIS REPORT This Critical Area Study is supplied to the Hot Mix Pavers as a means of determining on- site wetland conditions, as required by the City of Tukwila during the permitting process. This report is based largely on readily observable conditions and to a lesser extent, on readily ascertainable conditions. No attempt has been made to determine hidden or 9 concealed conditions. Reports may be adversely affected due to the physical condition of the site and the difficulty of access, which may lead to observation or probing difficulties. The laws applicable to wetlands are subject to varying interpretations and may be changed at any time by the courts or legislative bodies. This report is intended to provide information deemed relevant in the applicant's attempt to comply with the laws now in effect. The work for this report has conformed to the standard of care employed by wetland ecologists. No other representation or warranty is made concerning the work or this report and any implied representation or warranty is disclaimed. Wetland Resources, Inc. Senior Wetland Ecologist 10 BIBLIOGRAPHY Cooke, S. S. 1996. Wetland and Buffer Functions Semi -Quantitative Assessment Methodology. Cooke Scientific Services, Seattle, Washington. 29 pp. Cowardin,. L. M., et al. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish & Wildlife Service Biological Services Program, Resource Publication 79/31. 103 pp. Franklin, J. F., and Dyrness, C. T. 1969. Vegetation of Oregon & Washington. U.S.D.A. Forest Service, Research Paper PNW-80. 216 pp. Kusler, J. A. et al. 1990. Wetland Creation and Restoration — The Status of the Science. Island Press, Washington, D.C. 594 pp. Mader, S. S. 1985. Biology: Evolution, Diversity, and the Environment. Wm. C Brown Publishers, Dubuque, Iowa. 809 pp. 11 • Field Data Sheet • 99123 Hot Mix Pavers Investigation Date: 6/2/99 OPit Depth Texture Color Moisture Species % Status Strata Sl 0"- 8" orgsil 10YR 4/2 sat. at surface Phalaris arundinacea 100 FacW herb Wetland w/ motts 10 YR 5/8 8"- 20" orgsil 10YR 4/1 w/ motts 10YR 5/8 Conclusion: Wetland - Parameters for hydric soils, wetland hydrology and hydrophytic vegetation are met. S2 0"- 8" sil 10YR 3/2 moist Rubus discolor 60 FacU shrub Non- 10YR 5/8 Phalaris arundinacea 30 FacW herb Wetland 8"- 20" sil 10YR 4/2 moist 10YR 5/8 Conclusion: Non -Wetland - Parameters for hydrophytic vegetation, hydric soils, and wetland hydrology are not met. 12 WETLAND DELINEATION REPORT AND BUFFER REDUCTION PLAN HOT MIX PAVERS SEG. 15, TWP 23.N, RGE 4E, W.M. BUFFER REDUCTION 4,245 SQ. FT. ...- - �.-A. .� - - .*AS _ - - -, -•A- - . - -- -A- -A- -A- -As• �� X 45- _ WETLAND PROPOSED BUFFER REDUCTION BUFFERS DATA SITES _e. O Scale 1" = 50' Wd,8Oe8,/1ft • D505 19th Avenue 5.E Suite 106 Everett,Wnhlnpton 96206 Phone (425) 557.5174 Fee (425) 557-3045 eme6 • rwtIsndelehekyoncam mce 50 7S 100 WETLAND DELINEATION REPORT HOT MIX PAVERS Tukwila, Washington Hot Mhc Pwars Sheet 1.1 Attrt Antro Wcsteren Job tl 99123 1122 East PA.e St., Drawn by. S. era and Suite 13.1.5 Date July 12, 1999 Seattle, WA 96122 Revkbn • • 7.0 BASIN AND COMMUNITY PLANNING AREAS • • 8.0 OTHER PERMITS • • 9.0 EROSION AND SEDIMENTATION CONTROL DESIGN • • 9.0 EROSION AND SEDIMENTATION CONTROL DESIGN A detailed temporary erosion and sedimentation control plan is included within the set of construction drawings. This plan has been designed to incorporate methods to help control the downstream systems from undue erosion and sedimentation accumulation. V -ditches and installation of silt fences have also been shown. 7099.004 [JPJ/sm] 10.0 BOND QUANTITY WORKSHEET 0 Site Improvementgond Quantity Worksheet King County Department of Development & Environmental Services 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 Project Name: Hot Mix Pavers Location: South 131st Place Clearing greater than or equal to 5000 board feet of timber? yes no If yes, Forest Practice Permit Number: (RCW 76.09) Date: September 8, 1999 SIERRA Project No.: SIERRA Activity No.: Note: All prices include labor, equipment, materials, overhead and profit. Prices are from RS Means data adjusted for the Seattle area or from local sources if not included in the RS Means database. • 7099.006 [JPJ/ph] Unit prices updated 12/97 S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/Iusd/cad/SBQWS Page 1 of 9 Version: 1/28/99 Site Improvementeond Quantity Worksheet , , :.:- , • 1 :- ...5 ...:, ' ..'Referlitce:# :7, •:,;' .:'Unit ' Pride- ' .... - -.' Unit -,-; -21-',:;,.',., - . ' -?,- ' Quantity .: ''',f.t 4 7 - , :- ,.,* ' .i.;;.. 'if ''''' !: -'--'-:, .`ii of : .,',. ,. -3..f'Applicatipns.„;= :;5•C.:7:7;.'t ;': “ :. 2-.,,,..- • - .' cost •-,::=., EROSION/SEDIMENVCONTROIZ;; --', - ,:‘„ ' :. ' :•-•• ::: --.-.: .:.;'.• - ' ' .:,--,.... ''.,-.V: ':'-'. ',;,,,;.:5.r,---;&::.?'7P:'-e.,.....7.'' T1 - Backfill & compaction -embankment $ 4.89 CY 100 1 8489.00 Check dams, 4" minus rock SWDM 5.4.6.3 $ 58.70 Each 4 1 $234.80 Crush surfacing 1 1/4" minus WSDOT 9-03.9(3) $ 74.30 CY 80.00 Ditching $ 7.03 CY 30 1 $210.90 Excavation -bulk $ 1.30 CY $0.00 Fence, silt SWDM 5.4.3.1 $ 1.20 LF 470 1 $564.00 Fence, Temporary (NGPE) $ 1.20 LF 80.00 Hydroseeding SWDM 5.4.2.4 $ 0.51 SY $0.00 Jute Mesh SWDM 5.4.2.2 $ 1.26 SY $0.00 Mulch, by hand, straw, 3" deep SWDM 5.4.2.1 $ 1.75 SY 80.00 Mulch, by machine, straw, 2" deep SWDM 5.4.2.1 $ 0.46 SY $0.00 Piping, temporary, CPP, 6" $ 9.30 LF 80.00 Piping, temporary, CPP, 8" $ 14.00 LF $0.00 Piping, temporary, CPP, 12" $ 18.00 LF 80.00 Plastic covering, 6mm thick, sandbagged SWDM 5.4.2.3 $ 2.00 SY $0.00 Riprap, machine placed; slopes WSDOT 9-13.1(2) $ 33.98 CY 2.0 1 $67.96 Rock Constr Entrance, 50.x15'x1' SWDM 5.4.4.1 $ 1,273.34 Each 1 2 $1,910.01 Rock Constr Entrance, 100.x15.x1' SWDM 5.4.4.1 $ 2,546.68 Each 80.00 Sediment pond riser assembly SWDM 5.4.5.2 $ 1,695.11 Each 80.00 Sediment trap, 5high berm SWDM 5.4.5.1 $ 15.57 LF 30 1 $467.10 Sed. trap, 5' high, riprapped spillway berm section SWDM 5.4.5.1 $ 59.60 LF 80.00 Seeding, by hand SWDM 5.4.2.4 $ 0.44 SY $0.00 Sodding, 1" deep, level ground SWDM 5.4.2.5 $ 5.24 SY 80.00 Sodding, 1" deep, sloped ground SWDM 5.4.2.5 $ 6.48 SY $0.00 TESC Supervisor $ 65.00 HR $0.00 Water truck, dust control SWDM 5.4.7 $ 85.00 HR $0.00 wiliTE,irsjiTEnift*-:::::,',!•;43,!_e:;,,,7::,: :v:,..NW';:r,E't,3.` ..,,h.;4',,?0,4: .;:"':;5:1,_::,4,;',:.:Iy„.;; -.,i,;,;: ::` -..,1:',:),,,'_ .:°.•:,-.7:-.;:--'k='.-V::'....: ,.74:,;.'',...4:';',:?;';'i:::, _V"? -::::',',:`gi,i-J...q' 80.00 $0.00 $0.00 7099.006 [JPJ/ph] S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/lusd/cad/SBQWS ESC SUBTOTAL: COLUMN: $3,943.77 A • Unit prices updated 12/97 Page 2 of 9 Version: 1/28/99 Site Improvement/Pond Quantity Worksheet : _ ,.: `° :;., } ;- Existing Right=of Way, • Future- Public,{ ..:, „r Road Improvements & Drainage Facilities 'Private ; b •Improvements yBond�R'educlion•"'', - � 1., Unit Price Unit • Quant: . Cost Quant Cost-!: "°Quant. Cast Quant •. Complete". - Cost GENERAL ITEMS . Backfill & Compaction- embankment $ 4.89 CY $0.00 $0.00 $0.00 $0.00 Backfill & compaction- trench $ 7.42 CY 50 $371.00 $0.00 100 $742.00 $0.00 Clear/Remove Brush, by hand $ 0.31 SY $0.00 $0.00 $0.00 $0.00 Clearing/Grubbing/Removal, trees $ 7,718.40 Acre $0.00 $0.00 $0.00 .00 Excavation - bulk $ 1.30 CY $0.00 $0.00 1,000 $1,300.00 :00 Excavation - Trench $ 3.53 CY 50 $176.50 $0.00 100 $353.00 $0.00 Fencing, cedar, 6' high $ 16.13 LF $0.00 $0.00 $0.00 $0.00 Fencing, chain link, vinyl coated, 6' high $ 11.69 LF $0.00 $0.00 $0.00 $0.00 Fencing, chain link, gate, vinyl coated, 20' $ 1,105.92 Each $0.00 $0.00 $0.00 50.00 Fencing, split rail, 3' high $ 10.54 LF $0.00 $0.00 $0.00 $0.00 Fill & Compact - common barrow $ 19.63 CY $0.00 $0.00 $0.00 $0.00 Fill & Compact - gravel base $ 22.16 CY $0.00 $0.00 $0.00 $0.00 Fill & Compact - screened topsoil $ 32.91 CY $0.00 $0.00 $0.00 $0.00 Gabion, 12" deep, stone filled mesh $ 47.23 SY $0.00 $0.00 $0.00 $0.00 Gabion, 18" deep, stone filled mesh $ 65.09 SY $0.00 $0.00 $0.00 $0.00 Gabion, 36" deep, stone filled mesh $ 115.20 SY $0.00 $0.00 $0.00 $0.00 Grading, fine, by hand $ 1.76 SY $0.00 $0.00 $0.00 $0.00 Grading, fine, with grader $ 0.83 SY $0.00 $0.00 2,855 $2,369.65 $0.00 Monuments, 3' long $ 117.50 Each $0.00 $0.00 $0.00 $0.00 Sensitive Areas Sign $ 2.50 Each $0.00 $0.00 $0.00 •00 Sodding, 1" deep, sloped ground $ 6.49 SY $0.00 $0.00 $0.00 00 Surveying, line & grade $ 685.44 Day $0.00 $0.00 1 $685.44 $0.00 Surveying, lot location/lines $ 1,353.60 Acre $0.00 $0.00 $0.00 $0.00 Traffic control crew (2 flaggers) $ 74.07 HR $0.00 $0.00 $0.00 $0.00 Trail, 4" crushed cinder $ 6.60 SY $0.00 $0.00 $0.00 $0.00 Trail, 4" top course $ 7.24 SY $0.00 $0.00 $0.00 $0.00 Trail, 4" top course $ 7.12 SY $0.00 $0.00 $0.00 $0.00 Wall, retaining, rockery w/earthwork $ 38.40 SF $0.00 $0.00 $0.00 $0.00 Wall, rockery $ 8.25 SF $0.00 $0.00 $0.00 $0.00 SUBTOTAL $547.50 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/lusd/cad/SBQWS Page 3 of 9 $0.00 $5,450.09 $0.00 Unit prices updated 12/9' Version: 1/28/9! e Site Improvement�ond Quantity Worksheet 4 "' Existing Right -of -Way. Future Public "-... Road Improvements . & DrainageJFacilities -"'Private Improvements-` . • . Bond Reduction*. x Unit'Price Unit Quant, Cost Quant. - Cost Quant.' Cost Quant Complete;- Cost "•- ',ROAD IMPROVEMENT € <:..} *`x ... Cit}''=" =`' e �:.. srr- AC grinding, 4' wide machine < 1000sy $ 20.00 SY $0.00 $0.00 $0.00 $0.00 AC Grinding, 4' wide machine 1000-2000sy $ 5.00 SY $0.00 $0.00 $0.00 $0.00 AC Grinding, 4' wide machine > 2000 sy $ 1.20 SY $0.00 $0.00 $0.00 $0.00 AC Removable/Disposal/Repair $ 35.77 SY $0.00 $0.00 $0.00 Aik00 Barricade, type I $ 26.11 LF $0.00 $0.00 $0.00 W.00 Barricade, type III (Permanent) $ 39.17 LF $0.00 $0.00 $0.00 $0.00 Curb & Gutter, rolled $ 11.54 LF $0.00 $0.00 $0.00 $0.00 Curb & Gutter, vertical $ 8.43 LF 125 $1,053.75 $0.00 125 $1,053.75 $0.00 Curb & Gutter, demolition and disposal $ 11.81 LF $0.00 $0.00 70 $826.70 $0.00 Curb, extruded asphalt $ 2.12 LF $0.00 $0.00 $0.00 $0.00 Curb, extruded concrete $ 2.23 LF $0.00 $0.00 330 $735.90 $0.00 Sawcut, asphalt, 3" depth $ 1.61 LF 135 $217.35 $0.00 70 $112.70 $0.00 Sawcut, concrete, per 1" depth $ 1.47 LF $0.00 $0.00 $0.00 $0.00 Sealant, asphalt $ 0.86 LF 135 $116.10 $0.00 70 $60.20 $0.00 Shoulder, AC (see AC road unit price) SY $0.00 $0.00 $0.00 $0.00 Shoulder, gravel, 4" thick $ 6.55 SY $0.00 $0.00 $0.00 $0.00 Sidewalk, 4" thick $ 26.54 SY 80 $2,123.20 $0.00 30 $796.20 $0.00 Sidewalk, 4" thick, demolition and disposal $ 24.11 SY $0.00 $0.00 $0.00 $0.00 Sidewalk, 5" thick $ 30.38 SY $0.00 $0.00 $0.00 $0.00 Sidewalk, 5" thick, demolition and disposal $ 30.13 SY $0.00 $0.00 $0.00 Ark2.00 Sign, handicap $ 74.16 Each $0.00 $0.00 $0.00 1..00 Striping, per stall $ 5.06 Each $0.00 $0.00 14 $70.84 $0.00 Striping, thermoplastic, (for crosswalk) $ 2.07 SF $0.00 $0.00 $0.00 $0.00 Striping 4" reflectorized line $ 0.22 LF 125 $27.50 $0.00 $0.00 $0.00 SUBTOTAL $3,537.90 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/lusd/cad/SBQWS Page 4 of 9 $0.00 $3,656.29 $0.00 Unit prices updated 12/9' Version: 1/28/9' • Site Improvement fond Quantity Worksheet SUBTOTAL $1,677.50 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/Iusd/cad/SBQWS Page 5 of 9 $ 0.00 $0.00 $0.00 • Unit prices updated 12/9' Version: 1/28/91 �, a. Existing Right-of;Way: Future Public.":° Road Improvements'` & Drainage Facilities' Private ' Improvements d Reduction* Bon . - Unit Price „' Unit • Quant. - Cost - Quant, ' Cost Quant. Cost Quant.' Complete Cost ROAD SURFACING ::(4" Rock ="2.5' base ,& 1:5". top. course) .a For•;'93 KCRS (6.5'' Rock = •5" base & 1 :5.! lop course .. For KCRS '93, (additional 2.5" base) add: $ 3.13 SY $0.00 $0.00 $0.00 $0.00 AC Overlay, 1.5" AC $ 6.43 SY $0.00 $0.00 $0.00 $0.00 AC Overlay, 2" AC $ 7.61 SY $0.00 $0.00 $0.00 $0.00 AC Road, 2", 4" rock, First 2500 SY $ 14.99 SY $0.00 $0.00 $0.00 Aig.00 AC Road, 2" 4" rock, Qty. over 2500 SY $ 11.62 SY $0.00 $0.00 $0.00 IIIP.00 AC Road, 3", 4" rock, First 2500 SY $ 17.12 SY $0.00 $0.00 $0.00 $0.00 AC Road, 3", 4" rock, Qty. over 2500 SY $ 13.75 SY 122 $1,677.50 $0.00 $0.00 $0.00 AC Road, 5", First 2500 SY $ 12.67 SY $0.00 $0.00 $0.00 $0.00 AC Road, 5", Qty. Over 2500 SY $ 12.12 SY $0.00 $0.00 $0.00 $0.00 AC Road, 6", First 2500 SY $ 14.57 SY $0.00 $0.00 S0.00 $0.00 AC Road 6", Qty. Over 2500 SY $ 14.02 SY $0.00 $0.00 $0.00 $0.00 Asphalt Treated Base, 4" thick $ 8.01 SY $0.00 $0.00 $0.00 $0.00 Gravel Road, 4" rock, First 2500 SY $ 9.92 SY $0.00 $0.00 $0.00 $0.00 Gravel Road, 4" rock, Qty. over 2500 SY $ 6.55 SY $0.00 $0.00 $0.00 $0.00 PCC Road, 5", no base, over 2500 SY $ 18.70 SY $0.00 $0.00 $0.00 $0.00 PCC Road, 6" no base, over 2500 SY $ 19.02 SY $0.00 $0.00 $0.00 $0.00 Thickened Edge $ 5.99 LF $0.00 $0.00 $0.00 $0.00 SUBTOTAL $1,677.50 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/Iusd/cad/SBQWS Page 5 of 9 $ 0.00 $0.00 $0.00 • Unit prices updated 12/9' Version: 1/28/91 e Site Improvement�ond Quantity Worksheet SUBTOTAL $ 0.00 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/Iusd/cad/SBQWS Page 6 of 9 $0.00 $7,095.23 $0.00 Unit prices updated 12/9 Version: 1/28/9 Existing Right -of -Way Future Public Road Improvements & Drainage Facilities Private Improvements Bond Reduction* Unit Price Unit Quant. Cost Quant. Cost Quant. Cost Quant. Complete Cost DRAINAGE (CPP = Corrugated Plastic Pipe, N12, or Equivalent) For Culvert prices. Average if 4' cover was assumed. Assume perforated PVC is same price as soli( pipe. Access Road, R/D $ 14.56 SY $0.00 $0.00 $0.00 $0.00 Bollards - fixed $ 209.34 Each $0.00 $0.00 4 $837.36 $0.00 Bollards - removable $ 393.34 Each $0.00 $0.00 $0.00 $0.0C * (CBs include frame and lid) 40.00 CB Type I $ 1,093.60 Each $0.00 $0.00 3 $3,280.80 CB Type IL $ 1,246.60 Each $0.00 $0.00 $0.00 $0.00 CB Type II, 48" diameter $ 1,768.32 Each $0.00 $0.00 $0.00 $0.00 for additional depth over 4' $ 379.58 FT $0.00 $0.00 $0.00 $0.0C CB Type II, 54" diameter $ 1,906.56 Each $0.00 $0.00 $0.00 $0.00 for additional depth over 4' $ 423.07 FT $0.00 $0.00 $0.00 $0.0C CB Type ll, 60" diameter $ 2,044.80 Each $0.00 $0.00 $0.00 $0.00 for additional depth over 4' $ 466.56 FT $0.00 $0.00 $0.00 $0.0C CB Type II, 72" diameter $ 2,793.60 Each $0.00 $0.00 $0.00 $0.00 for additional depth over 4' $ 601.92 FT $0.00 $0.00 $0.00 $0.0C Through -curb Inlet Framework (Add) $ 318.34 Each $0.00 $0.00 $0.00 $0.00 Cleanout, PVC, 4" $ 113.52 Each $0.00 $0.00 $0.00 $0.00 Cleanout, PVC, 6" $ 152.09 Each $0.00 $0.00 3 $456.27 $0.00 Cleanout, PVC, 8" $ 194.95 Each $0.00 $0.00 $0.00 $0.00 Culvert, PVC, 4" $ 7.51 LF $0.00 $0.00 $0.00 $0.0C Culvert, PVC, 6" $ 10.96 LF $0.00 $0.00 230 $2,520.80 $0.00 Culvert, PVC, 8" $ 11.59 LF $0.00 $0.00 $0.00 $0.0C Culvert, PVC, 12" $ 18.93 LF $0.00 $0.00 $0.00 ap.00 Culvert, CMP, 8" $ 15.00 LF $0.00 $0.00 $0.00 WO .00 Culvert, CMP, 12" $ 23.00 LF $0.00 $0.00 $0.00 $0.0C Culvert, CMP, 15" $ 28.46 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 18" $ 32.82 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 24" $ 46.37 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 30" $ 62.13 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 36" $ 97.49 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 48" $ 122.46 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 60" $ 204.74 LF $0.00 $0.00 $0.00 $0.00 Culvert, CMP, 72" $ 263.11 LF $0.00 $0.00 $0.00 $0.00 SUBTOTAL $ 0.00 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/Iusd/cad/SBQWS Page 6 of 9 $0.00 $7,095.23 $0.00 Unit prices updated 12/9 Version: 1/28/9 Site Improvementeond Quantity Worksheet .'. ,� 3' �, Existing;.- Right-of=Way Future Public Road Improvements & Drainage aci ities -, F I Private Improvements _ Bond Reduction`•&• :S - Unit Price , "Unit . Quant, Cost Quant. Cost Quant Cost ,. ' Quant, Complete-- Cost IIVUCU,- Culvert, Concrete, 8" • •Y°...... $ 18.28 LF 80.00 80.00 $0.00 Culvert, Concrete, 12" Culvert, Concrete, 15" Culvert, Concrete, 18" Culvert, Concrete, 24" Culvert, Concrete, 30" Culvert, Concrete, 36" Culvert, Concrete, 42" Culvert, Concrete, 48" Culvert, CPP, 6" Culvert, CPP, 8" $ 26.13 LF 80.00 80.00 $0.00 $0.00 $0.00 $ 32.47 LF 80.00 $0.00 $0.00 $ 38.70 LF 80.00 $0.00 $0.00 $ 53.10 LF 80.00 $ 0.00 $0.00 $ 90.59 LF $0.00 $0.00 $0.00 80.00 80.00 $0.00 .00 .00 80.00 $0.00 $0.00 $0.00 $0.00 80.00 80.00 $0.00 $0.00 80.00 $0.00 $0.00 80.00 $0.00 80.00 80.00 0,00 .00 $0.00 $0.00 $0.00 $0.00 $0.00 80.00 $0.00 $0.00 $ 119.68 LF 80.00 80.00 $ 0.00 $ 137.76 LF $ 0.00 $0.00 $0.00 $ 152.99 LF $0.00 $0.00 $0.00 $ 9.30 LF $0.00 $0.00 $0.00 Culvert, CPP, 12" Culvert, CPP, 15" Culvert, CPP, 18" Culvert, CPP, 24" Culvert, CPP, 30" $ 14.00 LF $ 0.00 $0.00 181 $2,534.00 $ 18.00 LF 80.00 80.00 50 $ 900.00 $ 20.00 LF $0.00 80.00 $0.00 $ 24.00 LF $0.00 80.00 $0.00 $ 32.00 LF $ 0.00 $0.00 $0.00 LF Culvert, CPP, 36" Ditching $ 42.00 LF 80.00 $0.00 $0.00 $ 48.00 LF 80.00 $0.00 $0.00 Flow Dispersal Trench (1,435 base+) French Drain (3' depth) $ 7.03 CY $0.00 80.00 $ 0.00 $ 22.60 LF $0.00 $0.00 $0.00 Geotextile, laid in trench, polypropylene Infiltration pond Testing $ 19.65 LF $0.00 80.00 80.00 $ 2.09 SY $0.00 80.00 $0.00 Mid -Tank Access Riser, 48" dia, 6' deep Pond Overflow Spillway $ 65.00 HR $0.00 $0.00 80.00 $ 1,396.00 Each 80.00 80.00 80.00 Restrictor/Oil Separator, 12" Restrictor/Oil Separator, 15" Restrictor/Oil Separator, 18" Riprap, placed $ 12.18 SY $0.00 80.00 $0.00 $ 908.86 Each $ 0.00 80.00 1 $908.86 $ 952.66 Each $ 0.00 80.00 80.00 $ 996.66 Each 80.00 80.00 $0.00 Tank End Reducer (36"diameter) Trash Rack, 12" Trash Rack, 15" Trash Rack, 18" $ 33.98 CY 80.00 $0.00 80.00 $ 870.00 Each $0.00 80.00 80.00 $ 184.32 Each $0.00 80.00 $0.00 $ 206.32 Each 80.00 80.00 80.00 Trash Rack, 21" $ 233.82 Each $0.00 $ 0.00 80.00 8266.82 Each 80.00 80.00 80.00 SUBTOTAL $0.00 *KCC 27A authorizes only one bond S:PUBLIC\LUSD\LUIS\http://www.metrokc.gov/ddes/lusd/cad/SBQWS Page 7 of 9 $0.00 84,342.86 80.00 Unit prices updated 12/9' Version: 1/28/9! e Site Improvementtond Quantity Worksheet .. x `.` a , 4 a- -. s � • ,•Existing- Right -of Way 'Future Public . Road Improvements & Drainage; Facilities :Private sr: Improvements 'Bond.Reduction".- Y M�9� :.: Unit -Price - Unit Quant. ::. Cost ` Quant:4 ost' Quant:' `. ... - . Cost... ,.'. - n .Quant :'complete::: .Qost' PARKING LOT SURFACING> 2" AC, 2" top course rock & 4" borrow $ 13.77 SY $0.00 $0.00 $0.00 $0.00 2" AC, 1.5" top course & 2.5" base course $ 14.99 SY $0.00 $0.00 2,500 $37,475.00 $0.00 4" select borrow $ 3.96 SY $0.00 $0.00 $0.00 $0.00 1.5" top course rock & 2.5" base course $ 9.92 SY $0.00 $0.00 $0.00 0.00 WRITE-IN ITEMS Detention vault $58,800.00 $0.00 $0.00 1 $58,800.00 $0.00 Concrete swale $ 275.00 $0.00 $0.00 2 $550.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 SUBTOTAL $0.00 SUBTOTAL (SUM ALL PAGES) $5,762.90 30% CONTINGENCY & MOBILIZATION: $1,728.87 $0.00 $0.00 $96,825.00 $117,369.47 $0.00 $35,210.84 GRAND TOTAL: COLUMN: $7,491.77 $0.00 COLUMN: B *KCC 27A authorizes only one bond C $ 0.00 $0.00 $0.00 $152,580.31 0.00 D E Unit prices updated 12/9 S:PUBLICIUSDIUISthttp://www.metrokc.govkldes/lusd/cad/SBQWS Page 8 of 9 Version: 1/28/9 eeSite Improvement�ond Quantity Worksheet Original bond computations prepared by: Name: Jerry "Jake" Jacobs Date: September 9, 1999 PE Registration Number: 27694 Tel. #: (425) 251-6222 Firm Name: Barghausen Consulting Engineers, Inc. Address: 18215 72nd Avenue South Kent, WA 98032 Stabilization/Erosion Sediment Control (ESC) Existing Right -of -Way Improvements Future Public Road Improvements Private Improvements (A+B+C+D) =TOTAL (T) PERFORMANCE BOND AMOUNT SITE RESTORATION BOND (First $7,500 of bond shall be cash.) RIGHT-OF-WAY TOTAL RIGHT-OF-WAY SITE RESTORATION BOND** (First 47,500 of bond shall be cash.) PERFORMANCE BOND TOTAL AFTER BOND PERFORMANCE BOND AMOUNT Column (A) $ (B) $ (C) $ (D) $ Minimum bond amount is $1000. (A) $ (B) $ (A + B) $ (T -E) PUBLIC ROAD IMPROVEMENTS & DRAINAGE FACILITIES MAINTENANCE/DEFECT BOND* AMOUNT (B+C) X 0.25 = $ • • NAME OF PERSON PREPARING BOND REDUCTION Date: *NOTE: The word "bond" is used to represent any financial guarantee acceptable to King County. **NOTE: KCC 27A authorizes bonds to be combined when both are required. **NOTE: Per KCC 27A, total bond amount remaining after reduction shall not be less than 30% of the original amount. *KCC 27A authorizes only one bond Unit prices updated 12/9' S:PUBLICIUSDIUIS\http://www.metrokc.goviddes/lusd/cad/SBQWS Page 9 of 9 Version: 1/28/91 11.0 MAINTENANCE AND OPERATIONS MANUAL APPENDIX SAINTENANCE STANDARDS FOR PRIVAAINTAINED DRAINAGE FACILITIES NO. 3 - CLOSED DETENTION SYSTEMS (PIPES/TANKS) Maintenance Component Storage Area Manhole Catch Basins • Defect Plugged Air Vents Debris and Sediment Joints Between Tank/Pipe Section Tank Pipe Bent Out of Shape Cover Not in Place Locking Mechanism Not Working Cover Difficult to Remove Ladder Rungs Unsafe Conditions When Maintenance is Needed Results Expected When Maintenance Is Performed One-half of the cross section of a vent is blocked at any point with debris and sediment Accumulated sediment depth exceeds 1 O% of the diameter of the storage area for 14 length of storage vault or any point depth exceeds 15% of diameter. Example: 72 -inch storage tank would require cleaning when sediment reaches depth of 7 inches for more than f4 length of tank. Any crack allowing material to be transported into facility Any part of tank/pipe is bent out of shape more than 1 O% of it's design shape Cover is missing or only partially in place. Any open manhole requires maintenance. Mechanism cannot be opened by one maintenance person with proper tools. Bolts into frame have less than 14 inch of thread (may not apply to self-locking lids.) One maintenance person cannot remove lid after applying 801bs of lift. Intent is to keep cover from sealing off access to maintenance. King County Safety Office and/or maintenance person judges that ladder is unsafe due to missing rungs, misalignment, rust, or cracks. See "Catch Basins' Standards No. 5 Vents free of debris and sediment All sediment and debris removed from storage area. All joint between tank /pipe sections are sealed Tank/ pipe repaired or replaced to design. Manhole is closed. Mechanism opens with proper tools. Cover can be removed and reinstalled by one maintenance person. Ladder meets design standards allows maintenance person safe access. See "Catch Basins" Standards No. 5 1998 Surface Water Design Manual A-3 9/1/98 • • APPENDIX A MAINTENANCE STS FOR PRIVATELY MAINTAINED DRAI•E FACILITIES NO. 4 - CONTROL STRUCTURE/FLOW RESTRICTOR Maintenance Component General Defect Condition When Maintenance is Needed Results Expected When Maintenance is Performed Cleanout Gate Orifice Plate Overflow Pipe Manhole Catch Basin Trash and Debris (Includes Sediment) Structural Damage Distance between debris build-up and bottom of orifice plate is Tess than 1-1/2 feet. Structure is not securely attached to manhole wall and outlet pipe structure should support at least 1,000 lbs of up or down pressure. Structure is not in upright position (allow up to 10% from plumb). Connections to outlet pipe are not watertight and show signs of rust. Any holes—other than designed holes—in the structure. Damaged or Missing Cleanout gate is not watertight or is missing. Damaged or Missing Obstructions Obstructions Gate cannot be moved up and down by one maintenance person. Chain leading to gate is missing or damaged. Gate is rusted over 50% of its surface area. Control device is not working properly due to missing, out of place, or bent orifice plate. Any trash, debris, sediment, or vegetation blocking the plate. Any trash or debris blocking (or having the potential of blocking) the overflow pipe. See 'Closed Detention Systems" Standards No. 3 See 'Catch Basins" Standards No. 5 All trash and debris removed. Structure securely attached to wall and outlet pipe. Structure in correct position. Connections to outlet pipe are water tight structure repaired or replaced and works as designed. Structure has no holes other than designed holes. Gate is watertight and works as designed. Gate moves up and down easily and is watertight. Chain is in place and works as designed. Gate is repaired or replaced to meet design standards.. Plate is in place and works as designed. Plate is free of all obstructions and works as designed. Pipe is free of all obstructions and works as designed. See 'Closed Detention Systems' Standards No. 3 See 'Catch Basins" Standards No. 5 9/1/98 A-4 1998 Surface Water Design Manual APPENDIX AfkINTENANCE STANDARDS FOR PRIVATEL AINTAINED DRAINAGE FACILITIES NO. 5 - CATCH BASINS Maintenance Component General • • Defect Trash & Debris (Includes Sediment) Conditions When Maintenance is Needed Results Expected When Maintenance is performed Trash or debris of more than 1/2 cubic foot which is located immediately in front of the catch basin opening or is blocking capacity of the basin by more than 10% Trash or debris (in the basin) that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Trash or debris in any inlet or outlet pipe blocking more than 1/3 of its height. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane). Deposits of garbage exceeding 1 cubic foot in volume Structure Damage to Comer of frame extends more than 3/4 inch past Frame and/or Top Slab curb face into the street (If applicable). Cracks in Basin Walls/ Bottom Sediment/ Misalignment Top slab has holes larger than 2 square inches or cracks wider than 1/4 inch (intent is to make sure all material is running into basin). Frame not sitting flush on top slab, i.e., separation of more than 3/4 inch of the frame from the top slab. Cracks wider than 1/2 inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that structure is unsound. Cracks wider than 1/2 inch and longer than 1 foot at the joint of any inlet/ outlet pipe or any evidence of soil particles entering catch basin through cracks. Basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. No Trash or debris located immediately in front of catch basin opening. No trash or debris in the catch basin. Inlet and outlet pipes free of trash or debris. No dead animals or vegetation present within the catch basin. No condition present which would attract or support the breeding of insects or rodents. Frame is even with curb. Top slab is free of holes and cracks. Frame is sitting flush on top slab. Basin replaced or repaired to design standards. No cracks more than 1/4 inch wide at the joint of inlet/outiet pipe. Basin replaced or repaired to design standards. 1998 Surface Water Design Manual 9/1/98 A-5 APPENDIX A MAINTENANCE STAIRRDS FOR PRIVATELY MAINTAINED DRAI/11, FACILITIES NO. 5 - CATCH BASINS (CONTINUED) Maintenance Component Defect Conditions When Maintenance is Needed Results Expected When Maintenance is performed Catch Basin Cover Ladder Metal Grates (If Applicable) Fire Hazard Vegetation Presence of chemicals such as natural gas, oil and gasoline. Vegetation growing across and blocking more than 10% of the basin opening. Vegetation growing in inlet/outlet pipe joints that is more than six inches tall and less than six inches apart. Pollution Nonflammable chemicals of more than 1/2 cubic foot per three feet of basin length. Cover Not in Place' Cover is missing or only partially in place. Any open catch basin requires maintenance. Locking Mechanism Mechanism cannot be opened by on maintenance Not Working person with proper tools. Botts into frame have less than 1/2 inch of thread. Cover Difficult to One maintenance person cannot remove lid after Remove applying 80 lbs. of lift; intent is keep cover from sealing off access to maintenance. Ladder Rungs Unsafe Trash and Debris Damaged or Missing. Ladder is unsafe due to missing rungs, misalignment, rust, cracks, or sharp edges. Grate with opening wider than 7/8 inch. Trash and debris that is blocking more than 20% of grate surface. Grate missing or broken member(s) of the grate. NO. 6 DEBRIS BARRIERS (E.G., TRASH RACKS) Maintenance Components General Metal No flammable chemicals present. No vegetation blocking opening to basin. No vegetation or root growth present. No pollution present other than surface film. Catch basin cover is closed Mechanism opens with proper tools. Cover can be removed by one maintenance person. Ladder meets design standards and allows maintenance person safe access. Grate opening meets design standards. Grate free of trash and debris. Grate is in place and meets design standards. Defect Condition When Maintenance is Needed Results Expected When. Maintenance is Performed. Trash and Debris Damaged/ Missing Bars. Trash or debris that is plugging more than 20% of the openings in the barrier. Bars are bent out of shape more than 3 inches. Bars are missing or entire barrier missing. Bars are loose and rust is causing 50% deterioration to any part of barrier. Barrier clear to receive capacity flow. Bars in place with no bends more than 3/4 inch. Bars in place according to design. Repair or replace barrier to design standards. 9/1/98 A-6 1998 Surface Water Design Manual APPENDI MAINTENANCE STANDARDS FOR PRIVA NO. 10 - CONVEYANCE SYSTEMS (PIPES & DITCHES) Maintenance Defect Component Pipes Open Ditches Catch Basins Debris Barriers (e.g., Trash Rack) AINTAINED DRAINAGE FACILITIES Sediment & Debris Vegetation Damaged Trash & Debris Sediment Vegetation Erosion Damage to Slopes Rock Lining Out of Place or Missing (If Applicable). Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Accumulated sediment that exceeds 20% of the diameter of the pipe. Vegetation that reduces free movement of water through pipes. Protective coating is damaged; rust is causing more than 50% deterioration to any part of pipe. My dent that decreases the cross section area of pipe by more than 20%. Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Accumulated sediment that exceeds 20 % of the design depth. Vegetation that reduces free movement of water through ditches. See "Ponds' Standard No. 1 Maintenance person can see native soil beneath the rock lining. See "Catch Basins: Standard No. 5 See "Debris Barriers' Standard No.6 NO. 11 - GROUNDS (LANDSCAPING) Maintenance Component General Trees and Shrubs Defect Pipe cleaned of all sediment and debris. All vegetation removed so water flows freely through pipes. Pipe repaired or replaced. Pipe repaired or replaced. Trash and debris cleared from ditches. Ditch cleaned/ flushed of all sediment and debris so that it matches design. Water flows freely through ditches. See "Ponds' Standard No. 1 Replace rocks to design standards. See "Catch Basins' Standard No. 5 See "Debris Barriers' Standard No. 6 Weeds (Nonpoisonous) Safety Hazard Trash or Litter Damaged 1998 Surface Water Design Manual Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Weeds growing in more than 20% of the landscaped area (trees and shrubs only). Any presence of poison ivy or other poisonous vegetation. Paper, cans, bottles, totaling more than 1 cubic foot • within a landscaped area (trees and shrubs only) of 1,000 square feet. Limbs or parts of trees or shrubs that are split or broken which affect more than 25% of the total foliage of the tree or shrub. Trees or shrubs that have been blown down or knocked over. Trees or shrubs which are not adequately supported or are leaning over, causing exposure of the roots. Weeds present in Tess than 5% of the landscaped area. No poisonous vegetation present in landscaped area. Area clear of litter. Trees and shrubs with less than 5% of total foliage with split or broken limbs. Tree or shrub in place free of injury. Tree or shrub in place and adequately supported; remove any dead or diseased trees. A-9 9/1/98 APPENDIX *MAINTENANCE STANDARDS FOR PRIVAAINTAINED DRAINAGE FACILITIES NO. 13 - WATER QUALITY FACILMES (CONTINUED) D.) Wetvaults Maintenance Defect Component OWetvault Trash/ Debris Accumulation Condition When Maintenance is Needed Results Expected When Maintenance is Performed Sediment Accumulation in Vault Damaged Pipes Access Cover Damaged/ Not Working by one person. Trash and debris accumulated in vault, pipe or inlet/ outlet, (includes floatables and non- floatables). Sediment accumulation in vault bottom that exceeds the depth of the sediment zone plus 6 - inches. Inlet/ outlet piping damaged or broken and in need of repair. Cover cannot be opened or removed, especially Vault Structure Damaged Baffles Access Ladder Damage Vault Cracks wider than 1/2 -inch and any evidence of soil particles entering the structure through the cracks, or maintenance/ inspection personnel determines that the vault is not structurally sound. Baffles corroding, cracking, warping and/ or showing signs of failure as determined by maintenance/ inspection staff. Ladder is corroded or deteriorated, not functioning properly, missing rungs, has cracks and/ or misaligned. Trash and debris removed from vault. Removal of sediment from vault. Pipe repaired and/ or replaced. Pipe repaired or replaced to proper working specifications. No cracks wider than 1/4 -inch at the joint of the inlet/ outlet pipe. Vault is determined to be structurally sound. Repair or replace baffles to specifications. Ladder replaced or repaired to specifications, and is safe to use as determined by inspection personnel. 1998 Surface Water Design Manual A-13 9/1/98 Steve Lancaster, Director, Department of Community Development 0 10 20 40 E* WATER VALVE EX. SSM( PoM=1457 IE 12' MN=426 10 10' NE=3 82 10 12' 5E-3.78 • UI-1AUINU ANL) 5 I VIIM VI1AINAUC [-'LAN LOCATED IN A PORTION OF THE NE 1/4 S. 15, TWP. 23 N., R. e W.M. CI Y OF TUKWILA, KING COUNTY, WA EI.FAV C8 t4 � I_f05 EX i lrc•5 � ALAS .a.r:R 35 LF r WIDE CONC. SWALE 0 0.665 PER DETAIL 014 SHT. C4 EY *ATE VALVE -EY C..HAIT PAvFLQHT -- i EX FENCE 00 BE REMOVED/ / RELOCATED) i:'. wATER VAUE II` e EY. if v+UE • .l rod, IX. 20' ROADWAY PAC's' f w - EE.. 4ATEr• ti' E -w- N41'44'574 P L 366.36' PRIVATE ROAD W L /, 9 w 33 LF 3' WIDE CONC. SWALE 0 0.50 PER DETAIL ON 541. C4. 1: (VACATED RU�hF-ST.) J. S'1I,.�,' . -'1.5 (1:'1 VAC. ORD. 1168 E1 'p 155 : _� 1.OX : A.W �UTTEk �'.1 r9 (RAL'--OF-ywt- CBct, I Trt I EX. POW,L.POLE (TO RE)10.30 LAI If. W 5' B.S.BL AN0 LANDSCAPE SETBACK W WETLAND BOUNDARY NEW ROADWAY IMPROVEMENTS 1 PLAN PER SEPARATE I ;iii \f1,/ EW ASPHALT - PAVEMENT _ 1E-10.5 IE 2a" RCP -10.63-1,.. ID'.20' cONCR PAD FAR TRUCE WETLAND r BOUNDARY co Q\ -NEW ASPHN.T= PAVEMENT ' 72 it r SD O 0.425,✓' EX. 1ENCE (TO REMAIN) EX. SS'N Rim= 15.09 CTR C*NL t2"=2.58 RELOCATE EX. U.P BEHIND SIDLWALIC COORD W/POWER CO. AND PHONE CO. S41'44'5719 2.9.71 Pit CB • TYPE 2-54' .',P SOUD LOCKING UD S • 14.90 EX LOT L1CHT E= 9.0 (12" W) (TO RE14AR.1) E=3.4 36"14 EVE RO.W. uX SOLID UD RIM= 15.0 F- 11.77 W SOLID IID RIM= 15.0 E= 11.60 EX. FENCE (TO REMAIN) LOT LIGHT DURING CONSTRUCTION NOTE: WIiNG'BETWE$4 LOT LMHP3 SHALL BE PLACED UNDERGROUND. M= 15.00 IE. 3.4 (36' S) E= 10.9 (12' NE) OF = 12.5 LEGEND: PROPOSED TYPE 11 CATCH BASIN PROPOSED TYPE I CATCH BAS04 EXISTING TYPE I CATCH BASIN PROPOSED STORM DRAINAGE UNE EXISTING STORM DRAINAGE UNE PROPOSED SANITARY SEWER UNE PROPOSED SANITARY SEWER MANHOLE PROPOSED SANITARY SEWER CLEANOUT EXISTING SANITARY SEWER MANHOLE EXISTING SANRARY SEWER UNE EXISTING WATERMAN N.) • • 0 W EXISTMG FRE HYDRANT EXISTING WATER VALVE PROPOSED WATERMAN PROPOSED FOE HYDRANT PROPOSED WATER VALVE PROPOSED SPOT ELEVATIONS EXIS1LNC SPOT ELEVATIONS EXISTING CONTOURS PROPOSED CONTOURS PROPOSED PAVEMENT PROPOSED CONCRETE sof N --100------ ------100------ (-3.7 FL W. MONUMENT 05. rENCE . B 7�•-- T LEGAL DESCRIPTION: LOTS 6. 7. 8. 9 AND 10, BLOCK 4, ALL IN RNERTON REPIAT OF LOTS 1 TO 5 FOSTORIA GARDEN TRACTS. ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 13 OF RATS. PAGE 40. RECORDS OF KING COUNTY. WASHINGTON: EXCEPT THAT PORTION THEREOF CONDEMNED FOR STATE HIGHWAY BY COUNTY OF KING. CRY OF SEATTLE UNDER KING COUNTY AUDITOR'S FRE N0. 618285; EXCEPT THAT PORTION THEREOF CONVEYED TO THE STATE OF WASHINGTON FOR STATE HIGHWAY, BY DEED RECORDED UNDER AUDITOR'S FILE NO.'S 5719585 A140 5738787: TOGETHER WITH THAT Pam OF VACATED 511W ADJOINING THAT ATTACHED 8Y OPERATION OF LAW. iAK PARCEL NO.'S 743920-0220, -0225. -0230 AND -0235 BASIS OF BEARINGS: RECORD OF SURVEY FILED IN 8006 14. OF SURVEYS, PAGE 64. UNDER A.F. / 7808119004 VERTICAL DATUM: NOM 1929 GENERAL SITE DATA: WA� SEWER MACE POWER SOURCE: NINE SOURCE NATURAL GAS SOURCE: CRY OF TUKWILA CITY OF TUKWILA SEATTLE CITY LIGHT US WEST CAMMUMC/DIDNS PUGET SOUND ENERGY )30LAIDARY AND TOPOGRAPHIC SURVEY: BOUNDARY SURVEY BY LUND AND ASSOCIATES SURVEYORS DATED 4-28-89. TOPOGRAPHIC SURVEY BY LUND AND ASSOCIATES DATED 4-24-89. 9LM IaERI SD[YALK ES M .DRAT 48 .F -STREET NrCREOUIRED R( OF nMKA CO ROALj'`acuvp. macs¢ y I PRELIMINARY SITE PLAN 1 _....... _.___ __ ___ ._ ____ s4._ ..,Y..... 1111 _........6( ........... 14. � . 1 , .. _. _ CII .. 44457+ ` 1 30BRAIN. ulosuPE sMEEN �(YC /1231 s (VACATED RUtjH ST.) ,/ _�.. I� � 12 PRNATE ROAD VICINITY MAP LEGAL DISCRIP100 4 2 2.I G AM 10. ROA 4. ALL IR W.511TON R[RNO -�. — •— — LOTS 1 T mum.. aud[N TROTS, n... 10 TNC PLAT COUNTY. AMMON. PP.Of ONG TO VOL. M RATS PAGE w. RECORDS 5 OSGIE SETBACK , O EXCEPT I PORTION PERM CDRDENNED FOR SIN[ MOONY uto ROWS N4aro ATE 01 Yon[ . 0 KDID cowry uO. �__ ._♦• n 1 0. C CERT i OF PORION PERM COMttO TO DE srArc a STATE MN. En um REwmEo wRn k cuarws lac ec s 51195/ NO 02.3824: MED. .11 DAT PDrnw KNAR DEMO OF RrwrtD STREET N.A.PG INT AIMED 9Y OPERATION Of 4511 SDUORY �LrAIC4TOKPOLE INN)>1, rrtr e• LVO ,.\ L �`°°•, .• K " 10.10/11 MOW �fl NL MONKS SPECIAL CRY APPRDRNTM AND EDED. DUFFER MINCED P. RACE (TD MANN) EE PORCR PDF 511144'514 5'� IPEIPE-+ ' SS' BACK MSM AND SETOON 26911' _,• - LL (10 rtRUM) LEGEND. PROPOSED 0NC a COOT SAW u? PROPOSED TIPE CAM SAM • OUSTING nPR I CAIOT BM 0 PROPOSED SPMA 0.4. _I• EDSIES STERN ORN448 LRE PROPOSED We. S0O L. PRM0502 SNOW SEWER 64.484E • ROMEO 3042115 x600 0.700(I • MOO $14.107 SEWER 0.41 O DST. Mr. SERER LEEMt. 54.1.111 ccsnoc TIRE MO., ENSTINO INTER VANE PROPOSED 19.41a14401 PROPOSED FIRE MO. • PROPOSED MATER MESE PROPOSED SKR [l0NPd5 [ASTIR° SPOT ELEVATES 0E100 CORtRIRs PROPOSED CONTOURS PROPOSED u 0 7110600 PROPOSED CONCRETE RECEIVED CITY OF TUKWILA JUL131999 PERMIT CENTER N PMOL 41.1 141920-0220. -0225. -0930 Aro -0215 BASIS OF BEARINGS• cAs. VERTICAL DATUM. OTT OF 148404 u SL GENERAL SITE DATA. AGQIIEXILLWAILC4 4400 S 401.4 PLACE 1 AL(OC NK.LA /90014. INERNIZ471N COM. A WI 60US1102 0/0 IMAIALIte 2.523 SP. Ono/91DP .300 S%ONCE TMD EON CONSTRUCTION ELMIENT MICUNI C/ 50111E /11 FAST. C/O 4551: Cry EL(®E 0.404 SNF UN.: .165: GROSS TON. MG 44. S 125 SE. RATER CE VILCOR SOORCE 111x.44 SEWER POWER SOURCE 55455E ro 21 T P SOKCO I NICATIGrs salves PPPSOUND ENO. FRO.OCT sIOE OREM 5 RUT DR TMD a' FTR PRM. NOW NAI: 45 rm MIKE MNL -BASED ON MNL AREA PEE IRC 1032.140) FMESINEME - ONE 25 SM. PLOT MON OF Sul 5130 110011 - RAMC DODO (35 FEET !lFACCUT$MENEM (1.0 EER 1000 SCONE FN moss n00D AREA - 1aNfp 000Ia) 21.4.3.E SPACES a LPR fIL70 1 GROSS nARIA IA - (PCP NO. OF ...ES PROMO, - 13 STANDARD STALL 9I[-9'. G wiroACii rt (4ALL SUE (4 027 TR • AFFIC) • .. 000 (2-5127 TRAFFIC) - 24 FEET LRO CADS P[KOTNOUND-NA MP OMERREA NOOG STREET SR[ODED - 125 REI RUR ORD 1EORIM-DFELT SOF LY WAD - 5 On SPm u[M9 - N'ET.0 RATER Pw1TKF [1ENNCOENT REWIRED ROAM DEFTER M TN EionasaUtiamesxmemairele MOT •Y Duro NO ASSOCIATES M• OTORS DOM 4-2e-59.1 MC SIAM M LUND NO amcNrts GOD 3 10 A rn a 0 a. a x_ z • O w co cc A• w v • . . WATER}, .- 1 0 up • I EX 8' 1•••:•., • • lfP *c -it — w — EW. - WATER yALVIE 5 • AND GUTTER N4 i'44'5 -E — w— - 5' &SELL AND LANDSCAPE SETBACK -1' OEY/AU4 WATER VE 60:58 113WAY 5' B.S.ELL AND_ LANDSCAPE SETBAC- K Ex. womjx....POLE c _ r,7 REMOYED1 EX ASPHALT PAVEMENT - NO. ELA.15.06 .. • ;TREET TIRED EX 6 1.07 6.1 NEW BUILDING so 2,625 8.F. —- EX. FENCE 30 DRIVEWAY KIM GATE 7 11"11/11/"..7,-:-. • FEKL-.4-:FI1 ;:.;,,Z :.-, (TO BEIlly°,a-44 .;P ....11 366.38' - ...11',.? _. PRIVATE ROAI:5 -11 -6:..t-,. CP (VACATED R ST.) .1.E..41.5 (42 4 VAC, ORD. 1168- 1 5' lANOSCAPE SCREEN (SEE NOTES) , . • 50' DRIVEWAY - MN GATE / • EN' EX. EEKE WETLAND BOUNDARY *- . -7 EX. POWER POLE (TO REIM) 6 7/ -/ •e,- : • . 10 SIDEW OF TU IS 1 1) ; ..5-..‹. .-- „_.6"."A":1•.,y- " -:.. -• f • 1 • - ---'...?-rritZ7- ....,-• • -0. 'Aiirrt;77fia'1":„.. . ,,,,.. , :.., 5. •-s.”-;‘,....„ .-t.....x...,../Yi t • ./ ,,...... ,. , • .. ,...74i,.,.13.e.a.... t, ..„, .o. , ..3,4...<4.,.‘,......"' . ''..r..., 4.- '.i,,.`",,r....Z.,I ..g.444C,..-FiS--,,Lr EX. POWER POLE (TO BE REMOVED) 11 00 6 6 R.O.W. 12.5' LANDSCAPE MIN. SETBACK - • 5' B.S.B.L MID LANDSCAPE SETBACK . _ (TO REI,AMN) . LCT LC; WEILAND BOUNDAR I REDUCED TYPE 2 BUFFER , • REOUIRES SPECIAL CITY AP AND WETLAND BUFFER ENH PLANTINGS. EX. FENCE (TO REMNN) • 0 10 20 40 EY. WATER vALLE 1,5, SSMH HIM=14.5` IE 12' NW.h.25 tE 10" NE.3 82 11 12' SE -3.78 • • :EX UP 7 41 EY. 'WATER VALVE Et. WATER VALLE 1 va Ex15E. iVATER .�1 1 ro�� ti EX. 20' ROADWAY NEW ROADWAY IMPROVEMENTS PER SEPARATE PLAN i5 24' NCP. (. 4 /GI Mit; jS! 1r z' 9' T R.O.W. MONUMENT I {r 1 1 t:, .10.5 = 1 L 1 /1 w 0 uI 3 / I1 \` 1 ) H',,, IE 24' RLP.I I.CT/ 1 � T I I E. SSMH I 'nIAb 1519 '� CTR C!ML 12'.2.58 .m RELOCATE FX. U.P BEHIND SIDEWALK COORD W/POWER CO. MD PHONE CO. NTS d/L R.O.W. 11.31 EX. FEHC2 LEGAL DESCRIPTION: LOTS 6, 7. 8. 9 AND 10, BLOCK 4, ALL IN RIVERTON REPIAT OF 1015 1 TO 5 P05106IA GARDEN TRACTS. ACCORDING TO THE PLAT THEREOF RECORDED N VOLUME 13 OF PLATS, PAGE 40. RECORDS OF KING COUNTY. WASHINGTON: EXCEPT THAT PORTION THEREOF CONDEMNED FOR STATE HIGHWAY BY COUNTY OF KING. CITY OF SEATTLE UNDER KING COUNTY AUDITOR'S FRE NO. 618285: EXCEPT THAT PORTION THEREOF CONVEYED TO THE STATE OF WASHINGTON FOR STATE HIGHWAY. BY DEED RECORDED UNDER AUDITOR'S FILE NO.'S 5719583 AND 5738787: TOGETHER WITH THAT P091109 OF VACATED STREET ADJOINING THAT ATTACHED BY OPERATION OF LAW. TAX PARCEL NO.'S 743920-0220, -0223. -0230 AND -0235 BASIS OF BEARINGS: RECORD OF SURVEY FILED IN BOOK 14, OF SURVEYS. PAGE 64, UNDER A.F. # 7808119004 VERTICAL DATUM: NGVD 1929 GENERAL SITE DATA: MILInEit WATER SOURCE: SEWER SOURCE POWER SOURCE: PHONE SOURCE NATURAL GAS SOURCE: CITY OF TUKWM CITY OF TUK ILA SEATTLE Cm LIGHT US WEST COMMUNICATIONS PUGET SOUND ENERGY pOtn4DARY AND TOPOGRAPHIC SURVEY, BOUNO9Y SURVEY BY LUND AND ASSOCIATES SURVEYORS DATED 4-28-89. TOPOGRAPHIC SURVEY BY LUND AND ASSOCIATES DATED 4-24-89. �O 1,6014W8 LEGAL DESCRIPTION:. LOTS 6.7.8.9 AND 10. BLOCK 4. ALL IN RIVERTON REPLAT OF LOTS I TO 5. FOSTORIA GARDEN TRACTS. ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 13 OF PLATS. PAGE 40. RECORDS OF KING COUNTY. WASHINGTON: EXCEPT THAT PORTION THEREOF CONDEMNED FOR STATE HIGHWAY BY COUNTY OF KING. CITY OF SEATTLE UNDER KING COUNTY AUDITOR'S FILE NUMBER 6182857, EXCEPT THAT PORTION THEREOF CONVEYED TO THE STATE OF WASHINGTON FOR STATE HIGHWAY. BY DEED RECORDED UNDER AUDITOR'S FILE NUMBERS 5719585 AND 5738787: ADJOININGTOGETHER WITH THAT ATTACHED BY OPERATION OF T PORTION OF VACATED STREET BASIS OF BEARINGS RECORD OF SURVEY FLED IN BOOK 14. OF SURVEYS. PAGE 64. UNDER A.F. 8 780809004.: 0 SET REBAR/I.D. CAP • 0 SET LINE STAKE • EXISTING MON/CASE. ki SET NAJL/I.d. tog FENCE LINE ■ R/W MON ►41 CONCRETE MON SOUTH LINE C.C: LEWIS D.C: N 88'33'43' W - 402157 RECORDER'S CERTIFICATE .D.7.e. e9.•°�1R .• filed for rrrQord ofh'VE 19 .2.at..P.M. In book.X.R •.of�ugat pa9s /V..at therequest o1 DENNIS L LUND SURVEYOR'S' CERTIFICATE..'. TMs map correctly repr is a.survey made by me or under my direction In conformance with the. requirements of the Survey Racer no Aot at the - requsst of DICK'S TOWING INC. In 19.9x.... Certificate 110. -JAW. BOUNDARY SURVEY. LUND & ASSOCIATES SURVEYORS 2220 S. 287TH ST. FEDERAL WAY. WA. 98003 206 839-7755. CHID. BY BLS SCALE JOB,NO. ' 2589 SHEET IOFI :LOT /4: • 9.99 12' LE. 10.5 &S sAN MI RM M.8 r � Private road" (asphalt) (loco/ed:Ruth'sI.). o L T 10 LOT a.. RIM I3a., tx= • r LE.1.5 LOT 0 LEGAL DESCRIPTION: LOTS 6.7.8.9 AND 10. BLOCK 4. A:L IN RIVERTON REPLAT OF LOTS I TO 5 FOSTORIA GARDEN . RACTS. ACCORDING TO • THE PLAT THEREOF RECORDED 11 VOLUME 15 OF PLATS . PAGE 40. RECORDS OF KING COUNTY. WASHINGTON; EXCEPT THAT PORTION THEREOI' CONDEMNED FOR STATE HIGHWAY BY COUNTY OF KNG.:crrr OF SEATTLE UNDER - . IMO COUNTY AUDITOR'S FLE NUMBER 618285; except THAT PORTION THEREOF CONVEYED To THE STATE OF WASHINGTON FOR STATE HIGHWAY. BY. DEED RECORDED UNDER AUDITOR'S FLE NUMBERS :'719585 AND 5738787: TOGETHER WITH THAT PORTION OF VACATED STREET ADJOINING THAT ATTACHED BY OPERATION OF LAW. BEARINGS - K.C.A.S: VERTICAL DATUM CITY. OF TUKWILA DICK'S TOWING :INC. LUND & ASSOCIATES 2220 S: 287TH ST FEDERAL WAY. WA. 98003. 206.839-7755 APRIL 24.1989 JOB NO. 2589 . SEP :1 3 1999 P1:44 41 . 18215 72ND AVENUE SOUTH ' ° °° 7099 Pt \ KENT, WA 98032. (,....i,-.- :on No,lta Qi �� Z (425)251-6222 " Cheek's./ r-zo' sAee P o .• (425)251-8782 F/1/4,X,. o i,�'�.,q`p p`. :° ..- Approve. Vertical =8 ' 1' e'. . . CML ENGINEERING. LAND PUNNING - N/A `t l7ND E.000.°p SURVEYING, • ENVIRONMENTAL SERVICES Date $/10/99 C2,, 5 File: P:\SOSNPROJ\ 099\ENGINEERING \7099-G2.ONG Dole/lime: 09/10/1999 13w Scole 1.20 Cong. xrele Z7099 -5,27099-1,27099-R. HOT MIX PAVERS :. . 1122 EAST PIKE STREET 11345 _ SEATTLE, WASHIGNTON 98122. (206) 324-0106 TNI . • ROUGH GRADING AND TEMPORARY EROSION/SEDIMENTATION CONTROL PLAN • HOT MIX PAVERS • 4400. S. 131ST PLACE, TUKWILA • NOTES AND -DETAILS . 8 WIDE STEEL .TROWEL FWSN 3 CONCRETE GUTTER N/6'A110• W.W.IL • COMPACTED 5U8CRADE 5' MIN. CL/SS 0 A.B. • 00_ RETAINER BAFFLE GRR/SLUG E RETAINER WEIR CONCRETE SWALE DETAIL NOT TO SCALE FLOW DIFFUSER BAFFLE B65 ORMOND RATE COVER 12) PLATE ISPECTION COVERS 10 YR W.& EL -13.0 OR/WATER SEPARATOR CINLIBER OIL RETNNER BAFRE - ... ' PLATE ACCESS DOOR RW-15.DE INSPECTION TTI DIAMOND RATER P15PEGTION ^AVERS : FLOWW'DIFFUSER : .. DPoT/SLUDGE RETAINER WEIR :TYPICAL PAVEMENT SECTION;. NOT, To SCALE '. • PC11mN 0-P UTRITY VAULT No 577 5A 0R APPROVED EOWL SECTION A -A 10 YEAR WATER SURFACE EL -13.0 .• FEUD VERIFY LOCATNIN FOR ATTACHMENT OF - • SHEAR GATE HANDLE ... TO WALL OF VAULT ORIFICE OPENING 3/4. Ow1ETER \—NET TE -10.2 .. E-5.25 l 10-5.25 PIPE SUPPORTS 3'10.090 CAGE BOLTED. OR EMBEDDED 2' 1N WALL 0 MAK 3' SPACING • (MIN. 2 SUPPORTS). .. PLATE WTT11'ORIFICE '.. AS SPEC. ABOVE. O '' moi 8a, Gi Q IV W,. _ 'li^ RISER -DETAIL 811 F. 18215 72ND AVENUE SOUTH KENT, WA 98032 (425)251-6222 (425)251-8782 FAX CML ENGINEERING, LAND PUNNING, SURVEYING, ENVIRONMENTAL SERVICES HOT MIX PAVERS 1122 EAST PIKE STREET #1345. SEATTLE, WASHIGNTON 98122.:: (206) 324-0106 T.E.S.C. NOTES AND DETAILS HOT MIX PAVERS 4400 S. 131ST PLACE, TUKWILA n... no nn n000 '3 07 Scd.: 1720 Gena Xr.11: I7099-9; 'CITY OF TUKWILA STORM DRAINAGE GENERAL NOTES 1. ' ALL WORK AND MATERIALS SHALL 8E IN ACCORDANCE WITH .THE 'STANDARD . . .. . SPECIFICATIONS FOR ROAD, BRIDGE. AND MUNICIPAL CONSTRUCTION: WASHINGTON . STATE DEPARTMENT OF. TRANSPORTATION AND AMERICAN PUBLIC WORKS ASSOCIATION, WASHINGTON STATE CHAPTER 1994 EDITION. TOGETHER WITH T110 LATEST E011014 OF 114E CITY OF TUKWILA ENGINEERING STANDARDS 2. AN APPROVED COPY'OF THESE PLANS MUST BE ON SITE WHENEVER CONSTRUCTION IS IN PROGRESS.. . .. . 3. IT SHALL ' BE THE SOLE RESPON981U1Y OF THE CONTRACTOR TO OBTAIN 51Kttf USE AND ANY OTHER RELATED PERMITS PRIOR TO ANY CONSTRUCTION ACTIVITY W CITY 4. PRIOR TO ANY CONSTRUCTION ACTIVITY. 114E CITY OF TUKWILA ENGINEERING . DEPARTMENT (433-1850) MUST 8E CONTACTED FOR A PRECONSTRUCTION MEETING. 5. AU. LOCATIONS OF EXISTING UTIUTIES 94099 .HEREON HAVE BEEN ESTABLISHED BY -FIELD SURVEY OR OBTAINED FROM AVAILABLE RECORDS. AND SHOULD THEREFORE BE CONSIDERED APPROXIMATE ONLY AND• NOT NECESSARILY. COMPLETE IT IS THE SOLE - -.RESPON98UTY OF THE CONTRACTOR TD INDEPENDENTLY VERIFY '.TE.ACCURACY OF ALL UTIUTY LOCATIONS 9101W4. AN0 TO FURTHER DISCOVER AND AVOID ANY OTHER UTILITIES NOT SHOWN HEREON' WHICH MAY BE AFFECTED BY THE IMPLEMENTATIONOF. •. THIS PLAN. 1E' CONTRACTOR SHALL 'CONTACT TE UTGR U1IES UNDERGROUND LOCATION SERVICE (1-800-424-5555) PRIOR TO CONSTRUCTION. THE OWNER OR HIS . REPRESENTATIVE SHALL BE IMMEDIATELY CONTACTED 1F A UTIUTY .CONFUCT E15ST5. - 6. CATCH BASIN --TWE I - PER W500T/APWA STANDARD PLAN B-1 OR ASSOCIATED SAND AND GRAVEL CB -15. OR- EGUAL_ . - ' 7. •CATCH BASIN - TWE II - PER WSDOT/APWA STANDARD PLAN B -1E (48 -INCH I.D. OR' - 54 -INCH LE AS DESIGNATED) OR ASSOCIATED. SAND AND GRAVEL C8-19. OR EOUAL• 8.. U101 COVERS AS DESIGNATED ARE WSCOT/APWA'STANDARD. (PER STANDARD PLAN 8-12)• .. . ... . • 9. ALL TWE I CATCH BASINS SHML HAVE. LADDERS OR SAFETY, STEPS PER WSDOT/APWA STANDARD PLAN -B-12 - •. 10.: ALL CATCH BASIN FRAMES AND GRATES SHALL 8E DUCTILE IRON' PER WS80T/APWA . STANDARD PLAN B -2A. - . . 11 .ALL CATCH BASIN' CRANES• SHALL BE DEPRESSED 0.10 FEET BELOW PAVEMENT/CURB • LEVEL.: ,. .. . . • ALL OIL/WATER SEPARATOR CB ORATES SHALL -DE' OF THE. ROl1ND SOLID LOCKING TYPE 13. ALL STORM DRAINAGE CONVEYANCE PIPE SHALL' BE ONE OF THE FOLLOWING .AS DESIGNATED:.• '- - . • . CONCRETE. PER ASTM, C-14; CLAS5 IL NONREINFORCED BELL AND SPIGOT . (MTH: BELL FLUSH .WITH C.B. WALL 00 USED). WITH RUBBER GASKETS. ' . • B. P.V.C. CONFORMING TO AST.M. 0-3034 - SDR- 35. C. PIPE MAY BE ANY OF THE 'ABOVE PROVIDED:'. '. 1) • PIPE JOINTS MUST BE OF .1110 SAME MATERIALS, AND , -'2) • WHERE A PIPE MATERIAL IS SPECIFICALLY SHOWN ON THE PIAN, THAT- . '- MATERIAL MUST 8E USED . • • MINIMUM PIPE COVER SHALL BE 2.0 FEET: • . . SMOOTH WALL SPIRAL RIB ALUMINUM .(OR •ASPHALT -TREATED STEEL) PIPE. 16 GAUGE W/34 -INCH 3/4-114CH RIBS AT. 7 INCHES 0.0. ADS TWE N -12 -HIGH-DENSITY POLYETHYLENE CORRUGATED PIPE WITH AN INTEGRALLY FORMED SMOOTH' INTERIOR TO THE REOUIREMENTS OF AASH.T.O.' • • 14-294. (OR APPROVED EGUAL). • •.. 14... ALL PIPE BEDDING SHALL CONFORM TO'WSDOT/APWA SECTION 9-30.7(1)8 FMR' ALUMINUM AND P.V.C. PIPE, AND SECTION' 9-30.7(1)A FOR CONCRETE PIPE. ALL' TRENCH . BACKFILL SHALL BE COMPACTED .TO 92 PERCENT M1MMUM DRY DENSITY PER ASTM ... D-1557-70. - . . ' 15 ALL PIPE SHALL BE LAD ON A PROPERLY" PREPARED' FOUNDATION ACCORDING TO.: • WASHINGTON STATE SPECIFICATION 7-02.3(1).- THIS SHALL INCLUDE NECESSARY .LEVEIJNG OF TE TRENCH BOTTOM OR THE .TOP OF THE FOUNDATION MATERIAL A5 'VELE' AS -PLACEMENT AND COMPACTION OF REQUIRED BEDDING MATERIAL TO UNIFORM.GRADE S• O THAT ENTRE LENGTH OF TICE PIPE MEL BE SUPPORTED' ON A UNIFORMLY DENSE UNYIELDING BASE. IF THE NATIVE MATERIAL N THE BOTTOM OF' THE •TRENOH'MEETS 1HE• ' REQUIREMENTS FOR 'GRAVEL BACKFILL FOR PRE BEDDING'.114E FIRST LEFT OFPPE BEDDING MAY. 8E OMITTED, PROVIDED THE MATERIAL IN .111E BOTTOM THE TRENCH IS LOOSENED, REGRADED. A: COMPACTED' TO FORM' A DENSE UNYIELDINGBASE. - . •_ . 16. ALL BUILDING ROOF DRAIN DOWNSPOUTS AND FOOTING DRAINS. SHALL BE DIRECTLY • CONNECTED TO THE MAIN STOMADRAINAGECONVEYANCE SYSTEM THROUGH AN •... UNDERGROUND PIPE SYSTEM. ROOF .DRAINS AND FOOTING DRAINS STALL BE SEPARATE SYSTEMS AND SHALL BE CONSTRUCTED .OF 6 -INCH (OR8-11401DIAMETER WHERE SHOWN) P.V.C. (RIGID, NONPERFORATED 'FOR ROOF DRAINS PERFORATED FOR FOOTING DRAINS) SUFFICIENT =moon AND BENDS SHALL. 8E INSTALLED • 50 THAT' THE. SYSTEM CAN 8E EASILY MAINTAINED.' THE SYSTEM SHOWN -HEREON IS SCHEMATIC -"-ONLY. - TUE DRAINAGE/GRADING. CONTRACTOR OR LANDSCAPER MAY ALTER 1140 LAYOUT AS REQUIRED TO BETTER DRAIN -1 HE SITE. -THE CONTRACTOR SHALL KEEP A ..:. DIMENSIONED' RECORD OF TUE LOCATION OF ALL'PIPES AND CLEANWIS AND SUBMIT. . SAME TO THE CITY, ENGINEER.. AND OWNER UPON COMPLETION OF THE WORK .17. ALL ROOF AND FOOTING DRAINS SHALL BE LOCATED IN THE ADD .AND ADJUSTED AS NECESSARY'TO AVOID IMPACTING THE EXISTING TREES DENOTED ON THE GRADING PLAN .. TO BE SAVED. "DRAIN UNES SHOULD BE LOCATED OUTSIDE THEDRIP LINE OF TREES TO • SE SAVED WHEREVER POSSIBLE, 18.- THE STORM DRAINAGE S»1LM SHALL' BE CONSTRUCTED ACCORDING TO THE APPROVED -. PLANS WHICH ARE ON FILE IN THE ENGINEERING' DEPARTMENT. ' ANY DEVIATION FROM THE APPROVED PLANS MLL REWIRE WRITTEN APPROVAL FROM THE PROPER. AGENCY.. . 19. STRUCTURES SHALL NOT BE PERMITTED WITHIN .10 FEET OFTHESPRING UNE OF ANY . STORM DRAIN PIPE. .. ' ' .' .. 20. . CONSTRUCTION OF DEWATERING (GROUNDWATER) SYSTEM,. 10 REOl9RED. SHALL BE IN • ACCORDANCE WITH THE A.P.W.A. - STANDARD SPECIFICATIONS. SECTION 61=3.02. 1981 -EDITION. -. .. , 21: PRIOR TO OCOUPANCY, THE PERMANENT STORM .DRAINAGE SYSTEM MUST BE CLEANED OUT BY PUMPING. (DO -NOT PUMP -OR DISPOSE. MIO A140 OTHER STREAM,. STORM .- SEWER. OR SANITARY SEWER 14151al.) : 22. RIP RAP ROCK FOR EROSION PR01EC101 SHALL BE. OF SOUND•QUARRY ROCK PLACED • TO A MINIMUM 'DEPTH OF ONE (1) FOOT. RO0( AGGREGATE TO BE AS FOLLOWS: '4 9401 -.2 NICHES - 10 PERCENT' = 40 PERCENT . 2 INCHES - 4 INCHES0- 20 PERCENT - 40 PERCENT 4 INCHES - 8 INCHES - 40 PERCENT -.70 PERCENT 23. - TESTING OF ALL STORM SEWER PIPE WILL BE AT THE' -017110N OF THE 'CITY OF TUKWILA:. • 24. .WHEN PLAIN ALUMINUM PIPE OR -PIPE ARCH I5 USED WHERE IT '8911 8E IN CONTACT 8911' CONCRETE OR .CONCRETE PIPE. ALL ALUMINUM SURFACES IN CONTACT WI114 TUE • • . CONCRETE OR CONCRETE PIPE SHALL BE PAINTED WITH TWO COATS OF PANT. THE ALUMINUM PIPE TO BE PAINTED STALL BE CLEANED MTH 501.1ENT TO REMOVE . CONTAMINANTS AFTER CLEANING, THE PRE SHALL BE PAINTED WITH TWO COATS -OF.. PAINT CONFORMING TO FEDERAL SPECIFICATION 1T -P-645 (PRIMER. 'PAINT. ZINC . CHROMATE ALKYD VEHICLE) - . • , .... NOTES CITY OF TUKWILA SANITARY SEWER GENERAL.NOTES , 1. ALL. WORK AND MATERIALS SHALL BE IN ACCORDANCE 16111 THE 'STANDARD . DEPARTMENTNS OFFOR ROAD. TRANSPOR"BRIDGE. TION ANDD AMERICAN PUBLIC WORKS ASSOCIATION. PAL CONSTRUCTICN.' WASHINGTON .S• TATE WASHINGTON STATE CHAPTER, 1994 EDITION. .TOGETHER WITH THE LATEST EDITION DF TE ' . CITY OF. TUKWILA ENGINEERING STANDARDS. - - - " :2 ' AN APPROVED COPY O0 THESE PLANS MUST BE ON SITE -WHENEVER CONSTRUCTION IS IN .. 3. IT SHALL -BE 114E SOLE RESPONSIBILITY OF "THE - CONTRACTOR 1D OBTAIN STREET USE AND . 'ANY OTHER RELATED PERMITS PRIOR TO ANY CONSTRUCTION. ACTIVITY. N CITY RICHT-OF-WAY. . . ' - . • 4. ''.PRIOR TO ANY CONSTRUCTION ACTIVITY; THE CITY OF TUKWILA' ENGINEERING DEPARTMENT (433-1850) MUST BE CONTACTED FOR A PRECONSTRUCRON MEETING'.' 5,' ALL LOCATIONS OF -EXISTING UTILITIES SHOWN HEREON HAVE BEEN ESTABLISHED 130 FIELD . SURVEY OBTAINED FROM AVAILABLE RORDS ANDTHEREFORE BE CONSIDERED APPROXIMATE ONLY AND NOT ECESSARILY COMPLETE SIT IS THE 50LE RRESPON9BIUTY CF .. THE CONTRACTOR.TO INDEPENDENTLY VERIFY THE ACCURACY OF AU' UTILITY LOCATS SHOWN. AND TO FURTHER DISCOVER AND AVOID ANY OTHER UTILITIES NOT SHORN, HEREON WHICH MAY BE AFFECTED BY THE IMPLEMENTATION OF THIS PLAN. THE ' . . ' CONTRACTOR SHALL CONTACT THE 'UTRURES'UNDERGROUND LOCATION SERVICE-• (1-800-422-5555) PRIOR TO CONSTRUCTION. THE OWNER' OR HIS REPRESENTATIVE SHALL BE IMMEDIATELY CONTACTED IF A UTIUTY CONFLICT EXISTS- - - - - 6.-.. THE SANITARY SEWER SYSTEM SHALL BE CONSTRUCTED ACCORDING TO 1E APPROVED'. •. PLANS WHICH ARE ON FILE 111E CITY OF TUKMLA ENGINEERING DEPARTMENT ANY " DEVIATION FROM THE APPROVED PLANS WILL. REQUIRE W8IIEH APPROVAL FROM THE ' -. PROPER AGENCY. .. 7. ,'ALL, NEW SANITARY SEWER UNES SHALL BE SEALED OFF AT THE EASING TRUNK CONNECTION POINT UNTIL ALL UPSTREAM CONSTRUCTION IS COMPLETED. CLEANED. TESTED. LAMPED. AND ACCEPTED BY- THE. CITY OF TUKMLA. ALL CONSTRUCTION DEBRIS AN0 WATER SHALL BE REMOVED -FROM PIPE PRIOR TO OPENING SEAL • • .ALL.TYPE I-.48-INOH:MANHOLES SHALL BECONSTRUCTEDPER •WSIDOT/APWA STANDARD DETAIL -6-23A WITH ECCENTRIC CONES ALL MANHOLES SHALL HAVE A 'MINIMUM DROP OF 0.10 FEET BETWEEN .INVERTS ALL MANHOLES NOT IN PAVED .AREAS SHALL HAVE LOGONG:UDS •. D.. 'IT SHALL BE -TE RESPON981UTY OF THE CONTRACTOR 70 ADJUST. ALL' MANHOLE .. TOPS TO MATCH FINAL -ASPHALT ELEVATIONS ,AND GROUND EIEVATONS IN . :LANDSCAPED AREAS.: . 19.'. SEWER PIPE, BEDDING, AND.TREN01 COMPACTION A ALL SEWER PIPE SHALL 8E ONE OF THE FOLLOWING AS DESIGNATED . 1 •. P.V.C. CONFORMING TO AS1.M. 5-3034, SDR' 35. •- -• 2 DUCTILE PON. CLASS 50, CONFORMING:TO AW.WIA C151. 3, 'PIPE. MAY BE ANY OF THE ABOVE PROVIDED: A)) . PIPE JOINTS MUST 8E OF THE SAME MATERIALS, AND • 8). %WHERE A PIPE MATERIAL IS SPECIFICALLY SHOWN ON THE PLAN THAT MATERIAL' MUST. BE USED. •' - • - 4. ' MINIMUM PIPE COVER AT. MANHOLES SHALL BE 8.0 FEET AND 5.0. FEET ' BETMEEN'RU115 .. .. .. B. ., PIPE 'BEDDING SHALL BE A.P.W.A. TWE 'C WITH MATERIAL CONFORMING TO:. " • : SECTION 9-30.7A(2). - ' - : • ' • -• .. • C. " TRENCH BACKFILL SHALL BE COMPACTED '10 MINIMUM 929 DRY OPTIMUM' DENSITY ' • PER A.S.T.M D-1557-70 (MODIFIED PROCTOR) PRIOR. TO .TESTING SERER UNES FOR • 10. SIDE SEWER LATERALS - A SIDE SEWERS SHALL 8E 6-0407 MINIMUM DIAMETER AT 209 MINIMUM 'SU/Pt.. ' B. ' SIDE:SEWERS-SHALL 8E TESTED FOR, LEAKAGE AT THE SAME TIME THEE -MAIN 1.110' SEWER IS' TESTED. IF. NOT TESTED.TOCE1NEli. PROVIDE -TEST TEES AT SEWER MAIN CONNECTIONS.. 801101NGS WITH GREATER THAN 10 UNIT SHALL BE SERVICED. BYTNE 00 1110. FOLLOWING METHODS. - 1'.' ' DOUBLE• 6-IN01• DIAMETER "5ERVICES CONNECTED TO _TRUCK. BY STANDARD ' .2. ' 'SINGLE .8 -MCH DIAMETER SERVICE WITH •CLEANOUT. CONNECTED TO TRUNK' INTO MANHOLES ONLY. (ALTERNATE CONNECTION • METHODS ARE 'DEPICTED. • • ... . .D. ALL LATERAL CONNECTIONS 10 SEWER MAINS SHALL 8E MADE MTH A WYE OR SWEEPING TEE .. - , • . - ' • CONSTRUCT OF DEWATERING • (GROUNDWATER)' SYSTEM SHALL 8ET14 AC00RDANCE MTH • .114E A.P.W.A STANDARD SPECIFICATIONS. SECTION '61-3.02. 1981 EDI1104. AT 5101 BE LAD 12 *14 EIV SEWERS MUST CROSS UNDER WATER NEI THE SEER 91ALL AN ELEVATION THAT THE TOP OF THE SEWER LINE IS AT LEAST 38- INCHES BELOW THE 'BOTTOM ON THE WATER YAW. . . .. . 13 BUILDINGS SHALL NOT BE.PERMITTEO WITHIN.10 FEET OF THE -SPRING UNE OI ANY. . - SANITARY SEWER PIPE .. - 14. PRIOR TO °CCUPARCY, 114E DEVELOPER SHALL GRANT 10' NIDE SANITARY SEVER 'EASEMENTS TO THE OTY OF TUKWILA. " ' '15.. CLEANOUTS SHALL 80 PROVIDED AT. THE RIGHT-OF-WAY UNE FOR' LATERALS ENTERING THE PUBLIC RIGHT-OF-WAY. .. ... .. CITY OF TUKWILA • WATER GENERAL NOTES 1..' ALL WORK AND' MATERIALS SHALL BE 114 MTH THE 'STANDARD • - . TRUCTICN.- WASHINGTON DEPPCIFICATIONS ARTMENT OFFOR ROAD, TRANSPORTAATTION AND AMERICAN PU IDGE, At4D MUNICIPAL C WORKS ASSOCIATION, WASHINGTON STATE CHAPTER 1994 EDITION. TOGETHER MTU THE LATEST EDITION OF THE . CITY OF 1UKWILA ENGINEERING STANDARDS • AN APPROVED COPY OF THESE PLANS MUST BE ON 9TE WHENEVER CONSTRUCTION IS IN ' 3: IT. SHALL BE THE SOLE RESEON981UTY OF 1110 CONTRACTOR TO OBTAIN STREET USE AND ANY OTHER RELATED PERMITS PRIOR TO. ANY CONSTRUCTION ACTIVITY 114 CITY' RIGHT-OF-WAY... .. 4 PRIOR' TO ANY CONSTRUCTION ACTIVITY. THE CITY 13F. TUKWILA ENGINEERING DEPARTMENT .-..(433-1850) MUST 8E CONTACTED FGR A PRECONSTRUCRON MEETING. • 5.: ALL LOCATIONS OF EK1511140 UTNIIES-94OWN HEREON HAVE BEEN ESTABLISHED' 170 FIELD SURVEY OR OBTAINED FROM AVAILABLE RECORDS AND SHOULD THEREFORE 8E CONSIDERED' . .APPROXIMATE ONLY AND NOT NECFS.6R1LY COMPLETE. R IS THE SOLE RESPONSBNTY OF- . - THE CONTRACTOR TO INDEPENDENTLY VERIFY THE ACCURACY. OF ALL UTIUTY LOCATIONS SHOWN. AND TO FURTHER DISCOVER AND AVOID ANY OTHER U11111105 NO SHOWN HEREON -.9404 MAY BE .AFFECTED BY THE IMPLEMENTATION OF THIS PLAN. _ 111E CONTRACTOR SHALL CONTACT THE U11UTIES UNDERGROUND LOCATION SERVICE (1-800-424-5555) PRIOR TO CONSTRUCTION. THE OWNER OR HIS. REPRESENTATIVE SHALL BE IMMEDIATELY ,. CONTACTED 11MA UTILITY CONFLICT EAST& THE WATER MAIN DISTRIBUTION SYSTELI SHALL BE CONSTRUCTED ACCORDING TO 114E ' APPROVED PLANS 11111014 ARE ON FILE IN THE CITY OF TUKWILA ENGINEERING .DEPARTMENT. ANY DEVIATION' FROM .THE APPROVED -PLANS WILL REQUIRE WRITTEN APPROVAL FROM THE • • 7,- ' CONEC11015 10 EXISTING FACILITIES SHALL 8E SEATED' OFF UNTILCONSTRUCTION 15 COMPLETED. NO CONNECTIONS WILL BE ALLOWED UNTIL THE NEW WATER MAINS. HAVE PASSED. ALL PRESSURE AND PURITY 115,5. - •- . WATER MAIN PPE.. BEDDING AND TRENCH COMPACTION: :• .. A' ALL WATER. MAIN PIPE TO BE CEMENT UNE°, CLASS 52 DUCTILE IRON. CONFORMING TO AN.5J SPECIFICATIONS A-21.51 (A.W.W.A. C151-76), OR LATEST REVI90N. ' , -CEMENT MORTAR UNING AND 'SEAL COATING SHALL CONFORM' TO A.N.S.I. A=21.4-74 (AW.W.A C104-74). 011 LATEST R0%990NN. PIPE JOINTS TO BE PUSHED -ON, MECHANICAL OR FLANGE JOINTS . C. .'ALL WATER MAIN PIPE FTTTNGS'TO 8E' CEMENT UNED, . CLASS 250 GST • IRON.'. CONFORMING TO A.N.S.I. A-21.10 AND A-021.11-77.. OR LATEST REVI90N - 8. D. ALL WATER MAIN PIPE BEDDING TO BE A.P.W.A .CLASS 'C - ' .'- E ALL. WATER MAN CEMENT CONCRETE THRUST BLOCKS TO CONFORM TO STANDARD . -DETAILS' SHOWN ON THE PLANS .. - . F. • ALL. WATER MAN .TRENCH BACKFILL. SHALL BE COMPACTED TO MINIMUM -929' DRY OPTIMUM DENSITY PER A.S.T.R. 0-1557-70 (MODIFIED PROCTOR) PRIOR TO TESTING WATER .MAINS FOR' ACCEPTANCE. _ .. 9. ALL WATER 'ANN PIPE -10'' AND SMALLER -TO MAINTAIN A MINIMUM COVER AT 36 INCHES BELOW FINISHED GRADE WERE UTIUTY CONFUCTS OCCUR WATER MAINS ARE TO BE • LOWERED TO CLEAR• : ' . 10. - ALL WATER MAINS SHALL BEPRESSURETESTED' AND DISINFECTED IN ACCORDANCE MTH . THE SPECIFICATIONS OF THE .WASHINGTON STATE HEALTH DEPARTMENT AND CITY OF ' TUKWILA STANDARDS ALL INSPEC NON: AND PRESSURE TES11NC SHALL BE DONE IN THE PRESENCE OF, AND UNDER THE SUPERVISION: OF, THE Ott ENGNEER AND/OR HIS. 11.' CONTRACTOR TO PROVIDE PLUDS'AND/OR TEMPORARY BLOW -OFF ASSEMBUES FOR TESTING . AND PURITY ACCEPTANCE PRIOR TO FINAL TIE IN.. •. 12 : FIRE HYDRANTS: . • A ALL FIRE HYDRANTS SHALL CONFORM 10 THE 01Y OF TUKMLA STANDARD PUN - • '8.• - ALL FIRE 'HYDRANT PORTS SHALL. FACE PERPENDICULAR. TO CURB MID TOWARD : • ..DRIVEWAY. A5 SHOWN ON THE PUNS .13 DOMESTIC WATER SERVICES.• .. • - ' A.' • ALL DOMESTIC WATER SERVICE LINES TO BE TYPE 'K' COPPER. STANDARD .• ' GALVANIZED. STEEL PIPE, OR PVC PIPE 'SERVICE CONNECTIONS SHALL. 8E IN -. 'ACCORDANCE WITH CITY OF TUKWILA STANDARD PLAN N0. 202 OR N0. 203 ' '.. (DOUBLE STRAPS AND CORPORATION' STOPS).. 8. METER_ BOXES TO 'BE INSTALLED BY.1HE CONTRACTOR ' C. METERS TO BE INSTALLED BY THE CITY OF TUKWILA - .. 14. ' BUILDINGS SHALL NOT BE PERMITTED .WI114I9 10 FEET OF TIE .SPRING UNE OF ANY WATER • .. MAN, : .. _ _ 15. ALL. WATER' MANS NOT 'IN PUBLIC RIGHT-OF-WAY REWIRE 10-0001 NIDE EASEMENTS To. -.THE' OTT OF 11A(WILA . • - _ALL. FITTINGS SHALL BE CAST IRON OR DUCTILE, MTH FLANGED OR MECHANICAL JOINT • , - CONNECTION.. AND BE THE SAME THICKNESS CUSS A5 'THE PIPE USED. . 17. UVE TAPS TO 8E COORDINATED MTH TTY AT. LEAST 48. HOURS PRIOR TO CONSTRUCTION. :18... ALL PIE FITTINGS TO BE. USTED:•ND LABELED U.S, MR FIRE SERVICE INSTALLED, TESTED • AND FLUSHED AS SPECIFIED BY NEPA .STANDARDS NO. 13 AND NO. 24. PROPERLY -' COMPLETED CONTRACTOR'S MATERIAL AND TEST CERTIFICATES ARE TO BE PROVIDED TO • WASHINGTON SURVEYING AND RATING BUREAU AND THE OTT 00. T1MMU.' .. CITY OF TUKWILA GRADING GENERAL NOTES 1: ALL WORK AND MATERIALS SHALL BE IN ACCORDANCE WITH THE 'STANDARD - . SPECIFICATIONS FOR ROAD. BRIDGE, AND MUNICIPAL CONSTRUCTION.' WASHINGTON, • STATE DEPARTMENT OF TRANSPORTATION- AND -AMERICAN PUBLIC WORKS ASSOCIATION, WASHINGTON STATE CHAPTER 1994 EDITION. TOGETHER WITH THEW, LATEST EDITION OF .THE -CITY OF TUKWILA ENGINEERING STANDARDS • 2. AN APPROVED COPY OF THESE PLANS MUST BE ON 9TE. MNENEVER CONSTRUCTION IS IN PROGRESS. - • R SHALL BE THE SOLE RESP0N9BNTY OF THE CONTRACTOR -TO OBTAIN. STREET. USE AND A140' OTHER RELATED PERMITS PRIOR .TO ANY .CONSTRUCTION ACTIVITY IN CITY . RIGHT-OF-WAY.. ' . .. `PRIOR TO. ANY CONSTRUCTION ACTIVITY, THE CITY OF TUKWILA ENGINEERING . DEPARTMENT (433-1850) MUST BE CONTACTED FOR A PRCONSTRUCTION -MEETING • • 5. 'ML LOCATIONS OF .EIO511NG UTILITIES. SHOWN HEREON' HAVE'BEEN ESTABUSHED BY FIELD SURVEY OR OBTAINED .FROM AVAILABLE RECORDS •AND SHOULD • THEREFORE BE • CONSIDERED. APPROXIMATE ONLY AND -NOT NECESSARILY COMPLETE IT IS THE SOLE- - RESPONSIBIUTY OF THE CONTRACTOR TO INDEPENDENTLY VERIFY THE ACCURACY OF All. UTSJN LOCATIONS SHOWN, AND TO FURTHER DISCOVER KID AVOID ANY OTHER ' -.UTILITIES NOT SHOWN HEREON -V61101 MAY AFFECTED BY THE IMPLEMENTATION OF THIS..' ,`PLAN. THE CONTRACTOR SHALL CONTACT 1E UTIUTIFS UNDERGROUND LOCATION, SERVICE (1-800-424-5555) PRIOR TO CONSTRUCTION. 104E OWNER OR HIS . • REPRESENTATIVE SHALL BE IMMEDIATELY CONTACTED IF A UTILITY CONFUCT' EXISTS.' . '6. THE TEMPORARY EROSION/SEDIMENTATION CONTROL FACILITIES SHALL BE - - . '.CONSTRUCTED -PRIOR TO ANY GRADING OR EXTENSIVE. LAND. CLEARING N ACCORDANCE WI111 THE APPROVED TEMPORARY EROSION/SEDIMENTATIONCONTROL PLANS THESE ' • FACILITIES MUST BE SATISFACTORILY MAINTAINED. UNTIL CONSTRUCTION AND '• LANDSCAPING I5 COMPLETED. AND THE POTENTIAL FOR. 014 -SITE EROSION HAS PASSED, '.7. ALL -EARTHWORK UNDER PAVING TO BE USED•B0 VEHICULAR' TRAFFIC SHALL 90. • . COMPACTED TO MINIMUM 95 PERCENT. DRY OPTIMUM DENSITY PER ASTM. D-1557-70 • 8. UNLESS OTHERWISE NOTED ALL ELEVATIONS SHOWN IN PAVED AREAS ON THE PLANS . ARE TOP OF. PAVING. 9. IMMEDIATELY FOLLOWING FINISH GRADING. ANY DISTURBED AREAS NOT SPECIFIED. FOR PERMANENT LANDSCAPING SHALL BE SEEDED. AND STABILIZED MTN PERMANENT VEGETATION. CONSISTING OF RAPID. PERSISTENT. ' AND LEGUME GRASSER (MINIMUM 80/ PER ACRE). THIS 15 TO INCLUDE: • • 20 PERCENT' ANNUAL PERENNIAL OR HYBRID RYE GRASS - 40 PERCENT CREEPING RED FESCUE... I - - 40 PERCENT WHITE CLOVER 10.' 174E SITE WORK IMPROVEMENTS SHALL BE CONSTRUCTED ACCORDING TO THE APPROVED PLANS WHICH - ARE ON FILE IN 114E ENGINEERING DEPARTMENT. ANY DEVIATION FROM THE APPROVED PLANS MU. REOURE APPROVAL FROM THE PROPER AGENCY. 11. THE CONTRACTOR SHALL KEEP PARKING.LOTS AND STREET CLEAN AT ALL TIMES BY; -SWEEPING. WASHING OF ANY TRAVELED SURFACE TALL HOT BE ALLOWED. - 12. ALL PARKING AND DRIVEWAY AREAS TO HAVE P090VE C4ANAGE TO , - COLLECTION/CONVEYANCE 575104S OR OVERLAND SHEET DRAIN AREAS AT•OE ' PERCENT MINIMUM' SOPS PLAN DETAILS SHALL NOT SUPERSEDE 11415 REQUIREMENT. 13.- OPEN -NUT ROAD CR059N05 FOR 071LITY TRENCHES 014 EXISTING TRAVELED ROADWAYS'. SHALL 8E BACIOILLED'IN ACCORDANCE WITH CITY OF TUKWILA, WSOOT/APWA .. N ' STANDARD PURI B-11.ANDMECHANICALLYUTWI)1SA IN 'COMPACTED! CUTS INTO . * TEMPORARY E TIG ASPHALT SHALL BEST' BE PL CUT WITH A1O IN A CONTINUOUS UNE A PACTON9 R • COLD MIX PATCH MUST' REPLACED IMMEDIATELY AIRIER BACKFILL AND COMPACTION. " A PERMANENT HOT MO PATCH SHALL BE PLACED WITHIN 30 DAYS AND SHALL BE THE' .THICKNESS OF 114E ORIGINAL ASPHALT. OR THREE (3) INCHES. 991010108 15 GREATER. 14. EXTRUDED CEMENT' CONCRETE CURBS - AROUND . ASPHALT EDGES SHALL BE. CONSTRUCTED PER DETAIL , 4. W O o O = N' 1- O Oc~nW� < w co N .LU V1 N • QA,/,@ 8 8 ,JJJ/OMANE EW'`�Agic 00048E5 6-10-01 Fg