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HomeMy WebLinkAbout2023 - Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPS - Tukwila School District No. 406 (Foster High School) / City of Tukwila - 20230926000861Instrument Number: 20230926000861 Document:COV Rec: $264.50 Page -1 of 62 Record Date:9/26/2023 3:45 PM Electronically Recorded King County, WA After Recording Return to: City Clerk City of Tukwila 6200 Southcenter Boulevard Tukwila, WA 98188 DOCUMENT TITLE: Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPS REFERENCE NUMBER(S) OF RELATED DOCUMENTS: PW17-0130 Additional reference numbers at page 2 of document. GRANTOR: Tukwila School District No. 406 GRANTEE: City of Tukwila, a Washington Municipal Corporation ABBREVIATED LEGAL DESCRIPTION: A PORTION OF THE SW 14 OF THE SE V. OF SEC. 15, TWN. 23 N., RGE. 04 E. W.M. CITY OF TUKWILA, KING COUNTY, WASHINGTON W 500 FT OF S 629.84 FT OF SE Y. OF SE 1/4 & S 'h OF SW 'A OF SE 'A LESS W 190 FT OF E 565 FT OF S 320 FT LESS CO RDS Full legal on page 5 of document. KING COUNTY TAX PARCEL NUMBER: 152304-9108 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -2 of 62 Record Date:9/26/2023 3:45 PM King County, WA DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE OF STORMWATER FACILITIES AND BMPS 1. Parties 1.1 This Covenant for Inspection and Maintenance of Stormwater Facilities and Best Management Practices ("Covenant") is made by and between Tukwila School District No. 406, as Grantor, and the City ofTukwila, a Washington Municipal Corporation, as Grantee. Grantor and Grantee (also denoted as City herein) are each a Party and collectively the Parties to this Agreement. 2. Recitals 2.1 Grantor applied to City for issuance of a Site Development Permit on November 16, 2017. 2.2 Pursuant to TMC 14.30.060, application for and issuance of such permit requires the property owner to enter into this Covenant. 2.3 The subject of the Covenant is the real property located in King County, Washington, bearing King County Tax Parcel No. 152304-9108 and legally described in the attached Exhibit A incorporated herein ("Property"). 2.4 The City approved the applications which consist of the following documents, attached and incorporated herein: 2.4.1 City issued Permit No. PW17-01130, Exhibit 13. 2.4.2 Stormwater Facility/BMP Site Plan, Exhibit C. 2.4.3 Operations & Maintenance Plan including schedule, Exhibit D. 3. Terms of Agreement NOW THEREFORE, in consideration of the foregoing recitals and other good and valuable consideration including approval and issuance of City of Tukwila Permit PW17-0130, the sufficiency and receipt of which are acknowledged, Grantor hereby irrevocably covenants as follows: 3.1 Covenant. The foregoing Recitals and references to documents are incorporated as material terms of this 3.2 The Grantor(s) for itself and its successors in interest having any ownership interest in the Property (collectively Owners) shall at their sole cost and expense retain, uphold, operate, maintain, and repair the stormwater facilities and best management practices ("BMPs") located on the Property pursuant to the schedule within the Operations & Maintenance Plan. 3.3 The obligations required under Section 3.2 above shall be taken consistent the following: 3.3.1 The City shall have the right of ingress and egress over those portions of the Property necessary to perform inspections of the stormwater facilities and BMPs and conduct other activities specified in this Declaration of Covenant and in accordance with Tukwila Municipal Code ("TMC") 14.30.80. This right of ingress and egress, right to inspect, and right to perform required maintenance or repair shall be as provided for in subsection 3.3.2 below. City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -3 of 62 Record Date:9/26/2023 3:45 PM King County, WA benefit of all the citizens of the City and its municipal successors and assigns. References herein to the TMC shall include subsequent amendments to such statutes and all successor statutes. 3.10 This Covenant shall run with the land and shall be binding upon the Owners as defined in Section 3.2 above. 3.11 This Covenant may be amended or terminated only with the advance express written consent of the City as determined pursuant to its discretion. EXECUTED AND EFFECTIVE as of the date last signed below. FOR GRANTOR: Name 9,, 11 Title DATE: 42-1// 7- 3 / FOR GRANTEE: City of Tukwila Hari Ponnekanti Public Works Director DATE: 9 NOTARY BLOCKS APPEAR ON FOLLOWING PAGE City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -4 of 62 Record Date:9/26/2023 3:45 PM King County, WA 3.3.2 If the City determines that maintenance or repair work is required to be done to any of the stormwater facilities or BMPs, the Director of Public Works or designee (the "Director") shall give notice of the specific maintenance and/or repair work required pursuant to TMC 14.30.080. The Director shall also set a reasonable time in which such work is to be completed by the Owner. If the above required maintenance or repair is not completed within the time set by the Director, the City may perform the required maintenance or repair, and is hereby granted access to the Property for such purposes. Written notice will be mailed to the Owner stating the City's intention to perform such work. This work will not commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the Director, there exists an imminent or present danger, the seven (7) day notice period will be waived and maintenance and/or repair work will begin immediately. 3.4 If at any time the City reasonably determines that a stormwater facility or BMP on the Property presents an imminent hazard, as identified by TMC 14.30.080 and herein incorporated by reference, the Director or equivalent municipal successor's official may take measures specified therein. 3.5 The Owner shall assume all responsibility for the cost of any maintenance or repair work completed by the City as described in Covenant. Such responsibility shall include reimbursement to the City within thirty (30) days of the receipt of the invoice for any such work performed. Overdue payments will require payment of interest at the current legal rate as liquidated damages. All such costs and expense shall constitute a lien against the Property. 3.6 The Owners shall obtain a Type C Public Works permit from the City prior to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance such as replacement of plants and pretreatment mulch) in open vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or modifications to the stormwater facilities and BMPs referenced in this Covenant. Prior to the final approval and issuance of the new permit, a new Covenant with updated exhibits reflecting the changes to the stormwater facilities shall be recorded at the Owner's sole cost, and a copy of the new recorded Declaration of Covenant provided to the City. 3.7 Any notice or consent required to be given or otherwise provided for by the provisions of this Declaration of Covenant shall be effective upon personal delivery, or three (3) days after mailing by Certified Mail, return receipt requested, to the address listed below for that party: To Grantee: To Grantor: City Clerk City of Tukwila 6200 Southcenter Blvd. Tukwila, WA 98188 Tukwila School District No. 406 4640 South 144th Street Tukwila, WA 98168 3.8 With regard to the matters addressed herein, this Covenant constitutes the entire agreement between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever whether oral or written. This Covenant shall be governed by the laws of the State of Washington. Any suit to enforce or relating to this Covenant shall only be filed in King County Superior Court, King County, Washington, and the Parties consent to the jurisdiction thereof. In the event of any legal action by either Party relating to this Covenant, the Parties shall pay their own costs or fees. 3.9 This Covenant is intended to protect the value and desirability of the real property described in Exhibit A, promote the efficient and effective management of stormwater drainage, and shall inure to the City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -5 of 62 Record Date:9/26/2023 3:45 PM King County, WA STATE OF WASHINGTON ss. COUNTY OF KING • I certify that I know or have satisfactory evidence that RtN) 01\ is the person who appeared before me, and said person acknowledged that s/he signed this instrument on behalf of the \J»\ckW070 i arid acknowledged acknowledged it to be her/his free and voluntary act for the uses and purposes mentioned in this instrument. GIVEN UNDER MY HAND AND OFFICIAL SEAL this \‘‘‘‘‘‘I 0 Rxi ......;:•;04‘15 5 i 0 Fs!, 6?°4? 0 '11 t 12, 4C STATEIMF As ED ilVwv%\v‘• COUNTY OF KING day of Printed Name --De.),P0(T.5-31". !4•0-4 NOTARY PUBLIC in and for the State of Washington, residing at Vifr My Commission Expires bg oA ss. On this day personally appeared before me /41k7/ , to me known to be the 0 f 6-10,4.'e.s of the CITY OF TUKWILA, a municipal corporation and noncharter code city with a council -mayor form of government organized pursuant to RCW Title 35A, that executed the foregoing instrument, and acknowledged such instrument to be her free and voluntary act and deed of said city for the uses and purposes therein mentioned, and on oath stated that s/he was duly authorized to execute such instrument. GIVEN UNDER MY HAND AND OFFICIAL SEAL this (-)r day of Pr ,n , 2021. MA stop/ t.f.. :70 + u 206291 "(Jeoc." 09-2 c•••• WAS\A‘ City of Tukwila Stormwater Maintenance Declaration of Covenant Printed Name SW,o,,,://)- nl /7) 4,, r/&'. -1-i NOTARY PUBLIC in and for the State of Washington, residing at PI6 ki)c £ C My Commission Expires 1/ 70 5:1-9. 7 Instrument Number: 20230926000861 Document:COV Rec: 5264.50 Page -6 of 62 Record Date:9/26/2023 3:45 PM King County, WA EXHIBIT A LEGAL DESCRIPTION OF PROPERTY City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -7 of 62 Record Date:9/26/2023 3:45 PM King County, WA LEGAL DESCRIPTION THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 15, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON; EXCEPT THE WEST 190 FEET OF THE EAST 565 FEET OF THE SOUTH 320 FEET OF SAID SUBDIVISION, AND EXCEPT THE SOUTH 20 FEET DEEDED TO KING COUNTY FOR ROAD UNDER AUDITOR'S FILE NO. 1158646; AND EXCEPT THE WEST 30 FEET DEEDED TO KING COUNTY BY AUDITOR'S FILE NO. 472349 AND 5548565; EXCEPT THE NORTH 30 FEET OF THAT PORTION OF THE SOUTHWEST QUARTER OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 15, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON, LYING EAST OF THE WEST 30 FEET OF SAID SUBDIVISION AND WEST OF THE SOUTHERLY PRODUCTION OF THE EAST LINE OF VIEW STREET '43RD AVENUE SOUTH' AS SHOWN ON THE PLAT OF RIVERTON MACADAM ROAD TRACTS, ACCORDING TO THE PLAT RECORDED IN VOLUME 16 OF PLATS, PAGE 90, IN KING COUNTY, WASHINGTON; DEEDED TO KING COUNTY FOR ROAD UNDER AUDITOR'S FILE NO. 6010970; AND EXCEPT THE NORTH 3 FEET OF THE SOUTH 23 FEET OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 15, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON, FROM ENGR. STA. 88+80 TO ENGR. STA. 90+100 AS SURVEYED BY KING COUNTY SURVEY NO. 20-23-4-46, DEEDED TO KING COUNTY FOR ROAD UNDER AUDITOR'S FILE NO. 7408130313, ALSO THE WEST 500 FEET OF THE NORTH 609.84 FEET OF THE SOUTH 629.84 FEET OF THE SOUTHEAST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 15, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON. Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -8 of 62 Record Date:9/26/2023 3:45 PM King County, WA EXHIBIT B Permit [attached] City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -9 of 62 Record Date:9/26/2023 3:45 PM King County, WA City of Tukwila Department of Public Works 6300 Southcenter Boulevard, Suite 4100 Tukwila, Washington 98188 Phone: 206-433-0179 Fax: 206-431-3665 Web site: http://www.TukwilaWA.eov PUBLIC WORKS CONSTRUCTION PERMIT Parcel No: 1523049108 Permit Number: PW17-0130 Address: 4242 S 144TH ST BLDG 1. Issue Date: 10/24/2018 Permit Expires On: 4/22/2019 Project Name: FOSTER HIGH SCHOOL Owner: Name: TUKWILA SCHOOL DISTRICT Address: 4640 S 144TH ST , TUKWILA, WA, 98168 Contact Person: Name: KATE STROM Phone: (253) 383-2422 Address: 2215 N 30TH ST , TACOMA, WA, 98403 Contractor: Name: ANDY JOHNSON/CO INC Phone: (360) 352-3110 Address: PO BOX 46 , OLYMPIA, WA, 98507- 0046 License No: ANDY.1"•240QT Expiration Date: 12/19/2019 DESCRIPTION OF WORK: THE PARCEL IS APPROX. 24.64 ACRES IN TOTAL SIZE AND THE AREA AFFECTED BY REDEVELOPMENT IS APPROX. 4.89 ACRES. THE SPORTS FIELD LOCATED NE OF THE SCHOOL BUILDING (APPROX. 3.3 AC) WILL RECEIVE MAINTENANCE AND UPGRADING. THE NEW IMPROVEMENTS INCLUDE A MODIFIED SCHOOL BUILDING, UPDATED PARKING LOT N OF THE SCHOOL, SUPPORTING WATER, FIRE, STORM UTILITIES, AND A NEW STORMWATER DETENTION FACILITY. NPDES PERMIT tf WAR306349 -COVERAGE ACTIVE A5 OF 8/17/18. Fees Collected: $23,610.75 Electrical Service Provided by: SEATTLE CITY LIGHT Water District: 125 Sewer District: VALLEY VIEW,TUKWI LA Public Works Activities: Channellzation/StrIping: Curb Cut/Access/Sidewalk: Fire Loop Hydrant: Flood Control Zone: Hauling/Oversize Load: Land Altering: Landscape irrigation: Sanitary Side Sewer: Sewer Main Extension: Storm Drainage: Volumes: Cut: 10000 Fill: 5000 Number: 0 Instrument Number20230926000861 Document:COV Rec: S364.50Pugul0of63 RouordDuNo:9/26/2#23 3:45 PM King County, WA Street Use: Water Mair Extersion: Water Meter: No Permit Center Authorized Signature: ; /,-`C~ Date: '`-/�Y—//" /hearbycertify that 1 have read and examined ihis permit and know the same to be true and correct. All provisions of law and ordinances governing this work will be complied with, whether specified herein or not. The granting of this permit does not presume to give authority to violate or cancel the provisions of ariy other state cr local laws reg|annn c�ptmcuo"orthe performance nr work. | amauthorized to signonu obtainthis development pemi'nuv,the conditions ttached to this permit. Signature:/ Print Name: ' This permtt shall become null and void if the work 15 not commenced within 180 days for the date of issuance, or if the work is suspended or abandoned for a period of 180 days from the last inspection. PERMIT CONDITIONS: 17: TO SCHEDULE ALL FIRE INSPECTIONS CALL 206-575-4407. 1: All valves controlling the water supply for automatic sprinkler systems and waterflow switcesona|| sprinkler Systems shall be electrically supervised. (City Ordinance t2436) 18: .\lI new fire alarm systems or modificationsmem,un8syotemsshmUhavrdhevnuenappmva|ofThe Tukwila Fire Prevention Bureau. No work shall commence until a fire department permit has been obtained, (City Ordinance 11z43r) (IFC yoz.2) 2: All piping and attached appurtenances subjected to system working pressure shall be hydrostatically tested =tznopsi (zs.obar) orsupsi (s.5bar) inexcess o[the system working pressure, *micheverbuncater,and shall maintain that pressure a,/'Spsi (0.Bbar) for zhours, Contact the Public Works Department at 206- 433-0179 to make an appointment. (wppAa4,sec, zo,zo.z.z.1) 3: The fire department connection (FDC) shall have a downward angle bend between 22.5 and 45 degrees, with a 5 -inch Storz fitting(s) and Knox FDC locking Storz cap. (City Ordinance o24]6) 4: The height of fire department connections (FDC's) shall be 36 to 48 inches above grade. 5: Fire department connections (FDC's) shall be oriented in the direction of fire apparatus access, have a 4 foot clear space in front and to the sides of the connection, be appropriately signed, have the building 3ddress served by the FDC stenciled vertically in 3 -inch high white numbers on a "safety red" background Jirectly beneath the hose connection facing the direction of vehicular access, and protected from potential vehicular damage. 6: ;'ost Indicator Valves (PIV's) shall have the building address served by the PIV stenciled vertically in 3 -inch high white numbers on a "safety red" background, facing the direction of vehicular access. (City Ordinance *z«as) 7: ;:ire apparatus access roads "Fire Lanes" shall be identified by painting the curb yellow and a four inch wide ine and block letters 18 inches high, painted in the lane, at fifty foot intervals, stating, "FIRE LANE NO 7ARKING", color to be bright yellow, or by the posting of sign5 stating, "FIRE LANE NJO PARKING", and /aimin:the curb. Signs shall be posted on or immediately next to the curb line or on the building. Signs fhall be twelve inches by eighteen inches and shall have letters and background of contrasting color, readily readable from at leasi a fifty foot distance. Signs shall be spaced not further than fifty feet apart nor shall 'hey be more than four feet from the ground. (City Ordinance wz^ss) 8: All required hydrants and surface access roads shall be installed and made serviceable prior to and during the time of construction. (IFC 501.4) Instrument Number20230926000861 Document:COV Rec: S364.50Pugu11of63 RouordDuNo:9/26/2#23 3:45 PM King County, WA 9: Fire hydrants shall conform to American Water Works Association specifications C-502-54; it shall be compression type, equipped with two 2 1/2" N.S.T. hose ports and one 5" Storz pumper discharge port, and shall have a 1 1/4' Pentagon open-Uft operating not, (City Ordinance 4zO52) 10: Fire hydrants shall be oriented in the direction of fire apparatus access. 11: Hydrants shall not be closer than 4 feet to any fixed object (e.g., fences, parking, building, etc.), with the exception of hydrant guard posts. Guard posts shall be installed around hydrants not protected by curbs, so as to help prevent motor vehicles from contacting the hydrant. The guard posts shall be either steel pipe (minimum 4" distance) filled with concrete or concrete (minimum 8" diameter). Posts shall be 3 feet from the center of the hydrant and shall not be in direct line with any discharge ports. Posts shall be 6 feet long; 3-3 1/2 feet shall be buried. Painted firiish shall be the same colar as tor the applicable hydrants. The 4- fontc|rcumferencea,pundthehydrartw|Ubea|cve|sudfa,e. (City Ordinance #zn]2) 12: When subject to vehicular damage, protective guard posts or curbs are required around all gas meters, electrical transformers, sprinkler vaives and hydrants. Posts and curbs are to be painted yellow. (City Ordinance #2052) 13: Private hydrants shalt be alt yellow. l-fydrant color is to be "Rustoleum" 11659 YeIlow Gloss or Farwest #X- 3472 Case Yellow. X-a*7zcaoeve||v~. 14: Contact The Tukwila Fire Prevention Bureau to witness all required inspections and tests. (City Ordinances wz4yaand #z*a7) 15: Any overlooked hazardous condition and/or violation of the adopted Fire or Building Codes does not imply approval of such condition orviolation. 16: These plans were reviewed by lnspector 511. Ifyou have any questions, please caII Tukwila Fire Preverition Bureau at (206)575-4407. 19: ~^^pUoUcWORKS PERMIT ComomOwS**+ 20: caUu,,chedv|emandatorvpmrconstructionmeebnowithscoutrmou,e'pub|icvvu,ka|n,pe#ur,(zu6)433- 0179.Contact WD #125 and Valley View Sewer District for water and sewer modifications and capping. 50: Applicant shall contact WD #125 to check if domestic water RPPA shall be installed, if none is existing. Sanitary sewer work requires Valley View Sewer Dlstrict inspection. 51: Applicant shall contact WD #125 to check if domestic water RPPA shall be installed, if none is existing. Sanitary sewer work requires Valley View Sewer District inspection. 21: The applicant or contractor must notify the Public Works Inspector at (206) 433-0179 upon commencement and completion af work at least 24 hours in advance. Alt inspection requests for utility work must also be made 24 hours in advance. 22: Prior to construction, alt utilities iri the vtcintty shall be field Iocated. NOTE: For City ofTukwila utility locates, call 811 or 1-800-424-5555. 23: Permit is valid between the weekday hours of 7:00 a.m. and 5:00 p.m. only. Coordinate with the Public Work lnspector for any work after 5:00 p.m. and weekends, 24: No work under this permit during weekend hours without prior approval by Publtc Works. Coordinate with the Public Works Inspector. 25: Work affecting traffic flows shall be closely coordinated with the Public Works Inspector. Traffic Control Plans shall be submitted to the Inspector for prior approval. 26: The City of Tukwila has an undergrounding ordinance requiring the power, telecommunications, and cable service lines be underground from the point of connection on the pole to the house, 27: Flagging, signing and coning s),att be in accordance with MUTCD for Traffic Control. Contractor shall provide certified flagmen for traffic control. Sweep or otherwise ctean streets to the stisfaction of Public Works each night around hauling route (No ftushing atlowed). Notify Public Works lnspector before 12:00 Noon on Friday precedtng anyweekend work. 28: Any material spilted onto any street shall be cleaned up tmmediately. 29: Hauling 6 loaded vehicles per hour/8 hours a day for 2 or more consecutive days or hauling hazardous waste shall require application for a Hauling Permit prior to any associated activity. 30: Temporary erosion control measures shall be implemented as the first order of business to prevent sedimentation off-site or tnto existing drairiage facilit!es, Instrument Number20230926000861 Document:COV Rec: S264.50 Page -12 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA 31: The site shall have permanent erosion control measures in place as soon as possible aftefirial grading has beeri completed arid prior to the Final Inspection. 32: From October 1 through April 30, coveany siopes and stockpiles that are 3H:1V orsteeper and have a vertical rise of 10 feet or more and will be unworked for greater than 12 hours. During this time period, cover or mulch other disturbed areas, if they will be unworked more than 2 days. Covered material must be stockpiled on site at the beginning of this period. Inspect and maintain this stabilization weekly and immediately before, during and foliowing storms. 33: From May 1 through September 30, inspect and maintain temporary erosion prevention and sediment at least monthly. All disturbed areas of the site shall be permanently stabilized prior to final construction aypnp,ai 34: Pre -construction storm drainage patterns shall be met during and after construction. 35: The property owner is responsible for the maintenance of its storm drainage system and, for this purpose, shall have a maintenance plan in place and the responsibility for maintenance assigned prior to Public Works final. 36: A double detector check vaive assembly is required for the fire lines. 37: All double check vave assemblies shalt be approved by the State Departrnent of Health. 38: Applicant shall cbtain water meter from Water District #1zs(znu'z4z'ys4r).Since Water District wzzs doesn't inspect water pipe downstream of meter, City of Tukwila inspection is required. 39: Applicant shall obtain sanitary side sewer permit from ValIey View District (206-242-3236). 40: It shall be verified in writing to the PubIic Works Inspector that the landscape irrigation system contains a State Department of Flealth approved double check vaive assembly. This shall be done prior to the Final Inspection. 41: Geotechnical Engineer/Soils Engineer shall provide certification of trench backfill to the Public Works Inspector. Trench backfill shall be per 2012 WSDOT Standard Specifications for Road, Bridge, and Municipal Construction. (No native backfill unless approved by the City Engineer.) 42: The applicant shall submit to the Department of Ecology a Notice of Intent for Construction Activity.' A copy of the Notice is availabia at the Public Works Permit Center. 43: Maintain emergency, pedestrian, and vehicular access to buildings, trails and transit at ati times. 44: Coordlnate lane closures that may mpact usage of bus zones with King County Construction Information Center (CIC) at (206) 477-1140 or email construction.coord@kingcounty.gov. 45: Within 3 business days of any lane closure(s) within the bus zone, Contractor shall call Construction Information Coordinator, King County Department of Transportation, Metro Transit Division @ (206) 477- 1140oremaoconstrucuun.monu@kmgcoumv.00v. 46: Provide 10 feet minimum one-way access during construction with certified flaggers and two 10 foot rninimurn access during non -construction, one for each way. 47: Contractor shall stop alt construction activities within the City ofTukwila, if local traffic and/or pedestrian travel is not adequately addressed. 48: Prior to Public Works Final, provide storm drainage as -built plan, storm drainage maintenance plan and responsibility for maintenance assigned for stormwater treatment and flow control BMPs/Facilities. 49: Prior to finat permit sign -off applicant shalt provide AS -Built site plans nnZ4''x36^my|ao ancl electronic AutoCAD version on CD. PERMIT INSPECTIONS REQUIRED Permit Inspection Line: (206) 438-9350 5180 BACKFLOW - FIRE 5170 BACKFLOW 'IRR 5010 CHANNELIZATION/STP 5200 EROSION MEASURES 5210 EROSION MEASURES pwL 6010 FIRE ALARM Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -13 of 62 Record Date:9/26/2023 3:45 PM King County, WA 1400 FIRE FINAL 5020 FIRE LOOP HYDRANT 5060 LANDSCAPE IRRIGATION 1600 PUBLIC WORKS FINAL 5160 PUBLIC WORKS PRE -CON 5090 STORM DRAINAGE Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -14 of 62 Record Date:9/26/2023 3:45 PM King County, WA EXHIBIT C Stormwater Facility/BMP Site Plan [attached] City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -15 of 62 Record Date:9/26/2023 3:45 PM King County, WA WA TER VAL VE MARKER EXISTING STORM SYSTEM MODULAR WETLAND CB #2- HAMBERS i+1111111111Maff 11111111111111111 , 1111111H11111111 Hf11111f11t11t1,1 11111111111M1111 11111111111111111'2 1111111111111111 111111111111111111 11111111111111111 f1111111111111111r� 1,1111111111111111 11111111111111111) '1111tf111M1f11111111i 1118111 1111111111f111f 1111111111111111, .1,1111i111f11H11111f111111111111r L CB #7A CB #10 CB#11 CB #12A CB #21 CB #22 CB #12 CB #13 CB #15 CB #23 EX. STORM CB #19 CB#16 CB #17 CB #18 CB #25 CB #26 CB #26A TRANSFORMER CONTAINMENT SYSTEM EX. STORM .1 CB #27 CB#29 F,.1 2215 N. 30th Street, #300 Tacoma, WA 98403 253.383.2422 TEL 253.383.2572 FAX www.ahbl.com GRAPHIC SCALE 50 100 200 1"=100 FEET FOSTER HIGH SCHOOL STORMWATER SITE PLAN EX -B Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -16 of 62 Record Date:9/26/2023 3:45 PM King County, WA EXHIBIT D Operations & Maintenance Plan with Schedule [attached] City of Tukwila Stormwater Maintenance Declaration of Covenant Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -17 of 62 Record Date:9/26/2023 3:45 PM King County, WA 3:7 Stormwater Operation and Maintenance Plan PREPARED FOR: Tukwila School District No. 406 4640 South 144th Street Tukwila, WA 98168 PROJECT: Foster High School Modernization and Addition 4242 South 144th Street Tukwila, WA 98168 2160226.10 PREPARED BY: David Nason, PE Principal REVIEWED BY: David Nason, PE Principal DATE: April 2022 Civil Engineers • Structural Engineers • Landscape Architects • Community Planners • Land Surveyors Instrument Number20230926000861 Document:COV Rec: S264.50 Page -18 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA | hereby state that this Stormwater Operation and Maintenance Plan for Foster High School Modernization and Addition has been prepared by me or under my supervision and meets the standard of care and expertise that is usual and customary in this community for professional engineers. | understand that City of Tukwila does not and will not assume liability for the ouffidency, ouitubi|hy, or performance of drainage facilities prepared by me. Stormwater Operation and Maintenance Plan PREPARED FOR: Tukwila School District No. 406 4640 South 144th Street Tukwila, WA 98168 PROJECT: Foster Hih School Modernization and Addition 4242 South 144th Street Tukwila, WA 98168 2160226.10 PREPARED BY: David Nason, PE Principal REVIEWED BY: David Nason, PE Principal DATE: April 2022 Instrument Number: 20230926000861 Document:COV Rec: S364.50Pugu19of63 RouordDuNo:9/26/2#23 3:45 PM King County, WA Table of Contents Section Page 1.0 Overall Project Summary 1 2.0 Maintenance Importance and Intent 1 3.0 Responsibility 1 4.0 Description ofthe Drainage System and Facilities Serving the Site ...... —..... ..... ....... ........ 1 5.0 Schedu|e----..-----..—.--...—.—.~—...._.~...................~.....~.,,......,2 6.0 Cost Estimate 2 7.0 Pollution Source Control PIan 2 8.0 Vegetation Management PIan 3 Stormwater Operation and Maintenance Plan Foster High School Modernization and Addition 0000 Instrument Number20230926000861 Document:COV Rec: S264.50 Page -20 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA Appendices Appendix A Vicinity Map Appendix B Maintenance Checklist Appendix C Source Control BMPs Stormwater Operation and Maintenance PIan Foster High SchooModernization and Addition OMOEI Instrument Number20230926000861 Document:COV Rec: S264.50 Page -21 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA 1.0 Overall Project Summary This Stormwater Operations and Maintenance Plan accompanies the civil engineering plans submitted for the Foster High School Modernization and Addition project located on Parcel No. 1523049108 in King County, Washington. The parcel is approximately 24.64 acres in total size and the area affected by redevelopment is approximately 5.54 acres (see Appendix A-1 for the Vicinity Map). The new improvements include a modernized school building; classroom addition; updated parking lot north of the school; supporting water, fire, and storm utilities; and a new stormwater detention facility. Stormwater will be collected and channeled to either the new detention facitity or the existing detention pipe. Stormwater management will comply with the 2016 King County Surface Water Design Manual (KCSWDM), as adopted by City of Tukwila. This report presents a maintenance program that meets the requirements of the 2016 King County Surface WaterDesign Manual (KCSWDM). This document provides the guidelines for facilities to be maintained in a timely and conscientious manner. If the stormwater facilities and conveyance systems are not adequately inspected and maintained periodically, it could lead to local flooding and increased erosion potential. Siltation, debris, or lack of general maintenance can reduce the performance capabilities of the facilities. 2.0 Maintenance Importance and Intent The importance of maintenance for the proper functioning of stormwater controfacilities cannot boover emphasized. Asubstantial portion offailures (clogging offikem,resuspension cf sediments, loss of storage capacity, etc.) are due to inadequate maintenance. Stornnwater Best Management Practice (BMP) maintenance is essential to ensure that BMPs function as intended throughout their full life cycle. The fundamental goals of maintenance activities are to ensure the entire flow regime and treatment train designed for this site continue to fully function. For this site, these include: • Maintain ability to safely convey design stormwater fiows. • Freserve soil and plant health, as well as stormwater flow contactwith plant and soil systems. ° Clearly identify systems so they can be protected. • Keep maintenance costs Iow. ° Prevent Iarge-scale or expensive stormwater system failures. • Prevent water quality violations or damage to downstream properties. The intent of this section and manual is to pass on to the responsible party(ies) all the information critical to understanding the design of the system, risks and considerations for proper use, suggestions for maintenance frequencies, and cosso that realistic budgets can be established. 3.0 Responsibility The drainage facilities detailed in this report will be privately owned and maintained. Stormwater Operation and Maintenance Plan Foster High SchooModernization and Addition OMEHI Instrument Number20230926000861 Document:COV Rec: S264.50 Page -22 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA 4.0 Description of the Drainage System and Facilities Serving the Site Conveyance Systems New detention facilities will transport stonnwaterrunoff from the redeveloped portion ofthe property to the downstream system within 43rd Avenue South. To work pnopody, pipes must be kept free of silt and other debris. Modular Wetlands Modular wetlands will be installed to filter waterunoff from impervious surfaces. To maintain proper function, the pre-treatment area will need hobecleaned out and fi|terowill need hube replaced per mariufacturer's specifications. 5.0 Schedule Maintenance of the stormwater facility shall follow the schedule specified in the 2016 King County Surface WaterDesign Manual(KCSWDM). Additional maintenance may be required to respond to unusual storm events or reduced performance of the facilities. A copy of the recommended maintenance schedule is included as Appendix B and may be photocopied and used as inspection records. Inspection reports should be completed annually. Routine inspection and maintenance apply to all the systems that are considered an integral part of the onsite stormwater and pollution prevention facilities. 6.0 Cost Estimate The foliowing is an estimate of the average annual costof maintenance for the private stormwater control facilities within the scope of this project. Remove Sediment from Roof Dram Infiltration Structures 1. Misc / Parking lot cleaning / debris removal Personnel @ $25/hour x 40 hours/ear $1000 2. Annual Modular Wetland and Raingarden Maint. Personnel @ $25/hour x 16 hours/year $400 3. Vac Truck Area Drains and CBs $1500 Total Estimated Annual Cost $2,900 7.0 Pollution Source Control Plan Pollution source control is the application of pollution prevention practices on a developed site to reduce contamination of stormwater runoff at its source. Site-pecific BesManagement Practices (BMPs) have been incorporated into the site plan to reduce the number of contaminants used or discharged to the environment. See Appendix C for Source Control BMPs. Stormwater Operation and Maintennce Plan Foster High School Modernization and Addi(ion 2160226.10160226.10 2 Instrument Number20230926000861 Document:COV Rec: S264.50 Page -23 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA 8.0 Vegetation Management Plan The maintenance schedules in Appendix B provide guidance on vegetation control and management within stormwater facilities and general ground maintenance. Irrigation and other maintenance as necessary shall be provided to ensure that vegetation remains viable and that hardy root structures form in the first year. Vegetation planting shall be provided as described in the construction documents. 9'0 Instructions for Person Maintaining Stormwater System Appendix B contains a stormwater facility maintenance schedule. Plan to complete a checklist for all system components per the following schedule: • Monthly from November through ApriI; • Once in late summer (preferably September); and • After any major storm events (items marked 8' only). Using photocopies of the attached pages, check off the problems that are noted each time the item is inspected. Document comments on problems found and the corrective action taken. The inspection checklist sheets should be kept on file and used to prepare for annual reports. This analysis is based on data and records either supplied to or obtained by AHBL. These documents are referenced within the texof the analysis. The analysis has been prepared usirig procedures and practices within the standard accepted practices ofthe industry. AHBL, Inc. David Nason, PE Principal April 2022 Stormwater Operation and Maintenance Plan Foster Hgh School Modernization and Addition 2160226.10160226.10 3 °MOO Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -24 of 62 Record Date:9/26/2023 3:45 PM King County, WA Appendix A Vicinity Map Stormwater Operation and Maintenance Plan Foster High School Modernization and Addition 2160226.10160226.10 0000 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -25 of 62 Record Date:9/26/2023 3:45 PM King County, WA n Project Area Renton SeilTs"!c_ N. 30th Street. #300 Tacoma. WA 98403 253.383.2422 TEL 253.383.2572 FAX www.ahbt cam Ori.` ri FOSTER HIGH SCHOOL VICINITY MAP A Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -26 of 62 Record Date:9/26/2023 3:45 PM King County, WA Appendix B Maintenance Checklist Stormwater Operation and Maintenance Plan Foster High School Modernization and Addition 2160226.10160226.10 00-0 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -27 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 3- DETENTION TANKS AND VAULTS Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance Is Performed Site Trash and debris Any trash and debris which exceed 1 cubic foot per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general. there should be no visual evidence of dumping. Trash and debris cleared from site. Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to County personnel or the public. Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Grasslgroundcover Grass or groundcover exceeds 18 inches in height. Grass or groundcover mowed to a height no greater than 6 inches. Tank or Vault Storage Area Trash and debris Any trash and debris accumulated in vault or lank (Includes floatables and non-floatables). No trash or debris in vault. Sediment accumulation Accumulated sediment depth exceeds 10% of the diameter of the storage area for ' 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 V length of lank. All sediment removed from storage area. Tank Structure Plugged air vent Any blockage of the vent. Tank or vault freely vents. Tank bent out of shape Any part of tank/pipe is bent out of shape more than 10% of its design shape. Tank repaired or replaced to design. Gaps between sections, damaged joints or cracks or tears in wall A gap wider Than 'A -inch at the joint of any tank sections or any evidence of soil particles entering the tank al a joint or through a wall. No water or soil entering tank through joints or walls. Vault Structure Damage to wall, frame, bottom, and/or top slab Cracks wider than '%-inch, any evidence of soil entering the structure through cracks or qualified inspection personnel determines that the vault is not structurally sound. Vault is sealed and structurally sound. Inlet/Outlet Pipes Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment. Trash and debris Trash and debris accumulated in inlet/outlet pipes (includes floatables and non-floatables). No trash or debris in pipes. Damaged Cracks wider than 'A -inch at the joint of the inlet/outlet pipes or any evidence of soil entering al the joints of the inlet/outlet pipes. No cracks more than ''/-inch wide al the joint of the inlet/outlet pipe. 2016 Surface Water Design Manual — Appendix A A-5 4124/2016 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -28 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A :AINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 3 - DEI'ENTt©N TANKS AND VAULTS Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Access Manhole Cover/lid not in place Cover/lid is missing or only partially in place. Any open manhole requires immediate maintenance. Manhole access covered_ Locking mechanism not working Mechanism cannot be opened by one maintenance person with proper tools. Bolts cannot be sealed. Self-locking cover/lid does not work. Mechanism opens with proper tools. Cover/lid difficult to remove One maintenance person cannot remove cover/lid after applying 80 lbs of lift. Cover/lid can be removed and reinstalled by one maintenance person. Ladder rungs unsafe Missing rungs, misalignment, rust, or cracks. Ladder meets design standards. Allows maintenance person safe access. Large access doors/plate Damaged or difficult to open Large access doors or plates cannot be opened/removed using normal equipment. Replace or repair access door so it can opened as designed. Gaps, doesn't cover completely Large access doors not flat and/or access opening not completely covered. Doors close flat; covers access opening completely. Lifting Rings missing, rusted Lifting rings not capable of lifting weight of door or plate. Lifting rings sufficient to lift or remove door or plate. 4!24/2016 2016 Surface Water Design Manual - Appendix A A-6 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -29 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 4 - CONTROL STRUCTURE/FLOW RESTRICT©R Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Structure Trash and debris Trash or debris of more than % cubic fool which is located Immediately in front of the structure opening or is blocking capacity of the structure by more than 10%. No Trash or debris blocking or potentially blocking entrance to structure. Trash or debris in the structure that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. No trash or debris in the structure. Deposits of garbage exceeding 1 cubic fool in volume. No condition present which would attract or support the breeding of insects or rodents. Sediment Sediment exceeds 60% of the depth from the bottom of the structure to the invert of the lowest pipe into or out of the structure or the bottom of the FROP-T section or is within 6 inches of the invert of the lowest pipe into or out of the structure or the bottom of the FROP-T section, Sump of structure contains no sediment. Damage to frame and/or lop slab Corner of frame extends more than % inch past curb face into the street (If applicable). Frame is even with curb. Top slab has holes larger than 2 square inches or cracks wider than Y. inch. Top slab is free of holes and cracks. Frame not sitting flush on top slab, i.e., separation of more than V. inch of the frame from the top slab. Frame is sitting flush on top slab. Cracks in walls or bottom Cracks wider than '/ inch and longer than 3 feet, any evidence of soil particles entering structure through cracks, or maintenance person judges that structure is unsound, Structure is sealed and structurally sound. Cracks wider than V. inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering structure through cracks, No cracks more than 1/4 inch wide at the joint of inlet/outlet pipe. Settlement/ misalignment Structure has settled more than 1 inch or has rotated more than 2 inches out of alignment, Basin replaced or repaired to design standards, Damaged pipe joints Cracks wider than Y, -inch at the joint of the inlet/outlet pipes or any evidence of soil entering the structure at the joint of the inlet/outlet pipes, No cracks more than V. -inch wide al the joint of inlet/outlet pipes. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate, No contaminants present other than a surface oil film. Ladder rungs missing or unsafe Ladder is unsafe due to missing rungs, misalignment, rust, cracks, or sharp edges. Ladder meets design standards and allows maintenance person safe access. FROP-T Section Damage T section is not securely attached to structure wall and outlet pipe structure should support at least 1,000 lbs of up or down pressure. T section securely attached to wall and outlet pipe. Structure is not in upright position (allow up to 10% from plumb). Structure in correct position. Connections to outlet pipe are not watertight or show signs of deteriorated grout. Connections to outlet pipe are water light: structure repaired or replaced and works as designed. Any holes—other than designed holes—in the structure. Structure has no holes other than designed holes. 2016 Surface Water Design Manual —Appendix A A-7 4/2•/2016 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -30 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO, 4 — CONTROL" STRUCTURFJFFL.OW RESTRICTOR Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Cleanout Gate Damaged or missing Cleanoul gate is missing. Replace cleanoul gate. Cleanout gale is not watertight. Gate is watertight and works as designed. Gate cannot be moved up and down by one maintenance person. Gate moves up and down easily and is watertight. Chain/rod leading to gate is missing or damaged. Chain is in place and works as designed. Orifice Plate Damaged or missing Control device is not working property due to missing, out of place, or bent orifice plate. Plate is in place and works as designed. Obstructions Any trash, debris, sediment, or vegetation blocking the plate. Plate is free of all obstructions and works as designed. Overflow Pipe Obstructions Any trash or debris blocking (or having the potential of blocking) the overflow pipe. Pipe is free of all obstructions and works as designed. Deformed or damaged tip Lip of overflow pipe is bent or deformed. Overflow pipe does not allow overflow at an elevation lower than design Inlet/Outlet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment. Trash and debris Trash and debris accumulated in inlet/outlet pipes (includes floalables and non-floatabies). No trash or debris in pipes. Damaged Cracks wider than %,•inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes. No cracks more than V -inch wide at the joint of the inlet/outlet pipe. Metal Grates (If Applicable) Unsafe grate opening Grate with opening wider than % inch. Grate opening meets design standards. Trash and debris Trash and debris that is blocking more than 20% of grate surface. Grate free of trash and debris. footnote to guidelines tor disposal Damaged or missing Grate missing or broken member(s) of the grate. Grate is in place and meets design standards. Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in place. Any open structure requires urgent maintenance. Cover/lid protects opening to structure. Locking mechanism Not Working Mechanism cannot be opened by one maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work. Mechanism opens with proper tools. Cover/lid difficult to Remove One maintenance person cannot remove cover/lid after applying 80 lbs. of lift. Cover/lid can be removed and reinstalled by one maintenance person. 4,24;/2016 A-8 2016 Surface Nater Design nual P dix A Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -31 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO CATCH BASINS AND MANHOLES Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Structure Sediment Sediment exceeds 60% of the depth from the bottom of the catch basin to the invert of the lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin. Sump of catch basin contains no sediment, Trash and debris Trash or debris of more than 'A cubic foot which is located immediately in front of the catch basin opening or is blocking capacity of the catch basin by more than 10%. No Trash or debris blocking or potentially blocking entrance to catch basin, Trash or debris in the catch basin that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. No trash or debris in the catch basin. 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 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. Damage to frame and/or top slab Comer of frame extends more than % inch past curb face into the street (If applicable). Frame is even with curb. Top slab has holes larger than 2 square inches or cracks wider than '/ inch, Top slab is free of holes and cracks. Frame not sitting flush on top slab, i.e., separation of more than 3/ inch of the frame from the lop slab. Frame is sitting flush on top slab. Cracks in walls or bottom Cracks wider than A inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that catch basin is unsound, Catch basin is sealed and is structurally sound. Cracks wider than 'A inch and longer than 1 foot al the joint of any inloUoullet pipe or any evidence of soil particles entering catch basin through cracks. No cracks more than '/.r inch wide at the joint of inlel/outlet pipe. Settlement/ misalignment Catch basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. Basin replaced or repaired to design standards. Damaged pipe joints Cracks wider than '/-inch at the joint of the inleUoutlel pipes or any evidence of soil entering the catch basin at the joint of the inlet/outlet pipes. No cracks more than '/.-inch wide at the joint of inleVoutlet pipes. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. InIeUOullet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment. Trash and debris Trash and debris accumulated in inlet/outlet pipes (includes floatables and non-Iloalables). No trash or debris in pipes. Damaged Cracks wider than /-inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes. No cracks more than '/.-inch wide at the joint of the inlet/outlet pipe. 2016 Surface Water Design Manual — Appendix A A-9 4/24/201.6 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -32 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO 5 - CATCH BASINS J ND 1MANHOLES Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Metal Grates (Catch Basins) Unsafe grate opening Grate with opening wider Than rly inch. Grate opening meets design standards. Trash and debris Trash and debris that is blocking more than 2D% of grate surface. Grate free of trash and debris. footnote to guidelines for disposal Damaged or missing Grate missing or broken member(s) of the grate. Any open structure requires urgent maintenance. Grate is in place and meets design standards. Manhole Cover/Lid Cover/lid not In place Cover/lid is missing or only partially in place. Any open structure requires urgent maintenance. Cover/lid protects opening to structure. Locking mechanism Not Working Mechanism cannot be opened by one maintenance person with proper tools. Bolls cannot be seated. Self-locking cover/lid does not work. Mechanism opens with proper tools. Cover/lid difficult to Remove One maintenance person cannot remove cover/lid after applying 80 lbs. of lift. Cover/lid can be removed and reinstalled by one maintenance person. 4(24/2016 2016 Surface Water Design Manual — p ndix A Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -33 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 6- CONVEYANCE PIPES AND DITCHES Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Pipes Sediment & debris accumulation Accumulated sediment or debris that exceeds 20% of the diameter of the pipe, Waler flows freely through pipes. Vegetation/roots Vegetation/roots that reduce free movement of water through pipes. Water flows freely through pipes. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective coating or corrosion Protective coaling is damaged; rust or corrosion is weakening the structural integrity of any part of pipe. Pipe repaired or replaced. Damaged Any dent that decreases the cross section area of pipe by more than 20% or is determined to have weakened structural integrity of the pipe. Pipe repaired or replaced. 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 accumulation Accumulated sediment that exceeds 20% of the design depth. Ditch cleaned/flushed of all sediment and debris so that it matches design. Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to County personnel or the public. Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where County personnel or the public rnight normally be. Contaminants and pollution Any evidence of contaminants or pollution such as ail, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Vegetation Vegetation that reduces free movement of water through ditches. Water flows freely through ditches. Erosion damage to slopes Any erosion observed on a ditch slope. Slopes are not eroding. Rock lining out of place or missing (If Applicable) One layer or less of rock exists above native soil area 5 square feet or more, any exposed native soil. Replace rocks to design standards, 2016 Surface Water Design Manual — Appendix A A -I 1 4/24/2016 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -34 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO, 7- ©EBRISBAF BIERS (E.G. TRASH RACKS} Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed. Site Trash and debris Trash or debris plugging more than 20% of the area of the barrier, Barrier clear to receive capacity flow. Sediment accumulation Sediment accumulation of greater than 20% of the area of the barrier Barrier clear to receive capacity flow. Structure Cracked broken or loose Structure which bars attached to is damaged - pipe is loose or cracked or concrete structure is cracked, broken of loose. Structure barrier attached to is sound. Bars Bar spacing Bar spacing exceeds 6 inches. Bars have at most 6 inches spacing. Damaged or missing bars Bars are bent out of shape more than 3 inches. Bars in place with no bends more than% inch. Bars are missing or entire barrier missing. Bars in place according to design, Bars are loose and rust is causing 50% deterioration to any part of barrier, Repair or replace barrier to design standards. 4/24/2016 2016 Surface Water Design Manual — Appendix A A-12 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -35 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE. AND WQ FACILITIES NO, 8 -`ENERGY DISSIPATERS Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed. Site Trash and debris Trash and/or debris accumulation, Dissipater clear of trash and/or debris, Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate, No contaminants present other than a surface oil film. Rock Pad Missing or moved Rock Only one layer of rock exists above native soil in area five square feet or larger or any exposure of native soil. Rock pad prevents erosion. Dispersion Trench Pipe plugged with sediment Accumulated sediment that exceeds 20% of the design depth, Pipe cleaned/flushed so that it matches design. Not discharging wafer properly Visual evidence of water discharging al concentrated points along trench (normal condition is a 'sheet flow' of water along trench). Water discharges from feature by sheet flow. Perforations plugged, Over 1/4 of perforations in pipe are plugged with debris or sediment. Perforations freely discharge flow. Water flows out top of "distributor" catch basin, Water flows out of distributor catch basin during any storm less than the design storm. No flow discharges from distributor catch basin. Receiving area over- saturated Water in receiving area is causing or has potential of causing landslide problems, No danger of landslides, Gabions Damaged mesh Mesh of gabion broken, twisted or deformed so structure is weakened or rock may fall out. Mesh is intact, no rock missing. Corrosion Gabion mesh shows corrosion through more than ''A of its gage. All gabion mesh capable of containing rock and retaining designed form, Collapsed or deformed baskets Gabion basket shape deformed due to any cause. All gabion baskets intact, structure stands as designed. Missing rock Any rock missing that could cause gabion to loose structural integrity, No rock missing. Manhole/Chamber Worn or damaged post, baffles or side of chamber Structure dissipating flow deteriorates to V, or original size or any concentrated worn spot exceeding one square fool which would make structure unsound. Structure is In no danger of failing. Damage to wall, frame, bottom, and/or lop slab Cracks wider than %-inch or any evidence of soil entering the structure through cracks, or maintenance inspection personnel determines that the structure is not structurally sound. Manhole/chamber is sealed and structurally sound. Damaged pipe joints Cracks wider than %:-inch at the join) of the inlet/outlet pipes or any evidence of soil entering the structure at the joint of the inlet/outlet pipes. No soil or water enters and no water discharges at the joint of inleUoullel pipes. 2016 Surface Water Design Manual — Appendix A A -I i 4/24/2016 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -36 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES FENCING Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Site Erosion or holes under fence Erosion or holes more than 4 inches high and 12- 18 inches wide permitting access through an opening under a fence, No access under the fence. Wood Posts, Boards and Cross Members Missing or damaged parts Missing or broken boards, post out of plumb by more than 6 inches or cross members broken No gaps on fence due to missing or broken boards, post plumb to within 1%, inches, cross members sound. Weakened by rotting or insects Any part showing structural deterioration due to rotting or insect damage All parts of fence are structurally sound. Damaged or failed post foundation Concrete or metal attachments deteriorated or unable to support posts. Post foundation capable of supporting posts even In strong wind. Metal Posts, Rails and Fabric Damaged parts Post out of plumb more than 6 inches. Post plumb to within 1% inches. Top rails bent more than 6 inches. Top rail free of bends greater than 1 inch. Any part of fence (including post, top rails, and fabric) more than 1 foot out of design alignment. Fence is aligned and meets design standards, Missing or loose tension wire. Tension wire in place and holding fabric. Deteriorated paint or protective coating Part or parts that have a rusting or scaling condition that has affected structural adequacy. Structurally adequate posts or parts with a uniform protective coating. Openings in fabric Openings in fabric are such that an 8 -inch diameter ball could fit through. Fabric mesh openings within 50% of grid size. 4/24/2016 2016 Surface Water Design Manual — Appendix A A -I4 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -37 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES N©."i0-GATES/BOLLARDS/ACCESS BARRIERS Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Chain Link Fencing Gate Damaged or missing members Missing gate. Gates in place. Broken or missing hinges such that gate cannot be easily opened and closed by a maintenance person, Hinges intact and tubed. Gate is working freely. Gale is out of plumb more than 6 inches and more than 1 foot out of design alignment. Gate is aligned and vertical. Missing stretcher bar, stretcher bands, and lies. Stretcher bar, bands, and ties In place. Locking mechanism does not lock gate Locking device missing, no -functioning or does not link to all parts, Locking mechanism prevents opening of gate. Openings in fabric Openings in fabric are such that an 8 -inch diameter ball could fit through. Fabric mesh openings within 50% of grid size. Bar Gate Damaged or missing cross bar Cmss bar does not swing open or closed, is missing or is bent to where it does not prevent vehicle access. Cross bar swings fully open and closed and prevents vehicle access. Locking mechanism does not lock gate Locking device missing, no -functioning or does not link to all parts. Locking mechanism prevents opening of gate. Support post damaged Support post does not hold cross bar up. Cross bar held up preventing vehicle access into facility. Bollards Damaged or missing Bollard broken, missing, does not fit into support hole or hinge broken or missing. No access for motorized vehicles to gel into facility. Does not lock Locking assembly or lock missing or cannot be attached to lock bollard in place. No access for motorized vehicles to get into facility. Boulders Dislodged Boulders not located to prevent motorized vehicle access. No access for motorized vehicles to get into facility. Circumvented Motorized vehicles going around or between boulders. No access for motorized vehicles to get into facility. 2016 Surface Wafter Design Manual — Appendix A 4/24/2016 A -IS Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -38 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND NVQ FACILITIES NO. "i1= GROUNDS (LANDSCAPING} Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Site Trash or litter Any trash and debris which exceed 1 cubic fool per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can), In general, there should be no visual evidence of dumping. Trash and debris cleared from site, Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to County personnel or the public. Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film, Grass/groundcover Grass or groundcover exceeds 18 inches in height. Grass or groundcover mowed to a height no greater than 6 inches. Trees and Shrubs Hazard Any tree or limb of a tree identified as having a potential to fall and cause property damage or threaten human life. A hazard tree Identified by a qualified arborist must be removed as soon as possible, No hazard trees In facility. Damaged 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 and shrubs with less than 5% of total foliage with split or broken limbs. Trees or shrubs that have been blown down or knocked over, No blown down vegetation or knocked over vegetation. Trees or shrubs 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; dead or diseased trees removed. 4/24/2016 2016 Surface Water Design Manual — Appendix A A -I6 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -39 of 62 Record Date:9/26/2023 3:45 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE. AND WQ FACILITIES NO.12 - ACCESS ROADS'; Maintenance Component Detect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Site Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 square feet (i.e., trash and debris would fill up one standards size garbage can). Roadway drivable by maintenance vehicles. Debris which could damage vehicle tires or prohibit use of road. Roadway drivable by maintenance vehicles. Contaminants and pollution Any evidence of contaminants or pollution such as oil. gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate, No contaminants present other than a surface oil film, Blocked roadway Any obstruction which reduces clearance above road surface to less than 14 feet. Roadway overhead clear to 14 feet high. Any obstruction restricting the access to a 10- to 12 foot width for a distance of more than 12 feet or any point restricting access to less than a 10 foot width, At least 12 -foot of width on access road. Road Surface Erosion, settlement, potholes, soft spots, ruts Any surface defect which hinders or prevents maintenance access. Road drivable by maintenance vehicles. Vegetation on road surface Trees or other vegetation prevent access to facility by maintenance vehicles. Maintenance vehicles can access facility. Shoulders and Ditches Erosion Erosion within 1 fool of the roadway more than 8 inches wide and 6 inches deep, Shoulder free of erosion and matching the surrounding road. Weeds and brush Weeds and brush exceed 18 inches in height or hinder maintenance access. Weeds and brush cut to 2 inches in height or cleared in such a way as lo allow maintenance access. Modular Grid Pavement Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damaged or missing Access surface compacted because of broken on missing modular block. Access road surface restored so road infiltrates. 2016 Surface Water Design Manual —Appendix A 4,24/2016 A-17 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -40 of 62 Record Date:9/26/2023 3:45 PM King County, WA Maintenance Guidelines for Modular Wetland System - Linear Maintenance Summary o Remove Trash from Screening Device — average maintenance interval is 6 to 12 months. • (5 minute average service time). o Remove Sediment from Separation Chamber — average maintenance interval is 12 to 24 months. • ( 10 minute average service lime). o Replace Cartridge Filter Media — average maintenance interval 12 to 24 months. • ( 10-15 minute per cartridge average service time). o Replace Drain Down Filter Media — average maintenance interval is 12 to 24 months, • (5 minute average service time). o Trim Vegetation — average maintenance interval is 6 to 12 months. • (Service time varies). System Diaqra Inflow Pipe (optional) Access to screening device, separation chamber and cartridge filter Access to drain down filter Pre -Treatment Chamber Biofiltration Chamber www.modularwetlands.com Discharge Chamber Instrument Number20230926000861 Document:COV Rec: S264.50 Page -41 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA Maintenance Procedures Screening Device U�LN NF�� 1. Rennovmgrahenrnnanho|ecovmrtngoinoonosototheuureeningdeviceinMhePre- Treatment Chamber. Vault type units do not have screening device. Maintenance can be performed without entry. 2. Remove alt pollutants collected by the screening device. Removal can be done manually or with the use of a vacuum truck. The hose of the vacuum truck will not damage the screening device. 3. Screening device can easily be removed from the Pre -Treatment Chamber to gain access to separation chamber and media filters below. Replace grate or manhole cover when completed. Separation Chamber 1. Perform maintenance procedures of screening device listed above before maintaining the separation chamber. 2. With a pressure washer spray down pollutants accumulated on walls and cartridge filters. 3. Vacuum out Separation Chamber and remove all accumulated pollutants. Replace screening device, grate or manhole cover when completed. Cartridge Filters 1. Perform maintenance procedures on screening device and separation chamber before maintaining cartridge filters. 2. Enter separation chamber. 3. Unscrew the two bolts holding the lid on each cartridge filter and remove lid. 4. Remove each of 4 to 8 media cages holding the media in place. 5. Spray down the cartridge filter to remove any accumulated pollutants. 6. Vacuum out old media and accumulated pollutants. 7. Reinstall media cages and fill with new media from manufacturer or outside supplier. Manufacturer will provide apecifinaUonofmedia and sources tnpurchase. 8. Replace the lid and tighten down bolts. Replace screening device, grate or manhole cover when completed. Drain Down Filter 1. Remove hatch or manhole cover over discharge chamber and enter chamber 2. Unlock and lift drain down filter housing and remove old media block. Replace with new media block. Lower drain down filter housing and lock into place. 3. Exit chamber and replace hatch or manhole cover. mwwnw.mmoduUammetKando.comm Instrument Number20230926000861 Document:COV Rec: S264.50 Page -42 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA Maintenance Notes �� M(DuLAR WETLANDS 1. Following maintenance and/or inspection, it is recommended the maintenance operator prepare a maintenance/inspection record. The record should include any maintenance activities performed, amount and description of debris collected, and condition ofthe system and its various fi|tarmechanisms. 2. The owner should keep maintenance/inspection record(s) for a minimum of five years from the date of maintenance, These records should be made available to the governing municipality for inspection upon request at any time. 3. Transport all debris, trash, organics and sediments to approved facility for disposal in accordance with local and state requirements. 4. Entry into chambers may require confined space training based on state and local regulations. 5. No fertilizer shall be used in the Biofiltration Chamber. 6. Irrigation should be provided as recommended by manufacturer and/or landscape architect. Amount of irrigation required is dependent on plant species. Some plants may require irrigation. www.modularwetlands.com Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -43 of 62 Record Date:9/26/2023 3:45 PM King County, WA Maintenance Procedure Illustration Screening Device The screening device is located directly under the manhole or grate over the Pre -Treatment Chamber. It's mounted directly underneath for easy access and cleaning. Device can be cleaned by hand or with a vacuum truck. Separation Chamber The separation chamber is located directly beneath the screening device. It can be quickly cleaned using a vacuum truck or by hand. A pressure washer is useful to assist in the cleaning process. MODULAR \X/ ET LANDS REMISMONSE5 www.modularwetlands.com Instrument NumberDocument:COV Rec: S264.50 Page -44 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA Cartridge Filters The cartridge fHters are Iocated in the Pre -Treatment chamber connected to the wall adjacent to the biofiltration chamber. The cartridges have removable tops to access the individual media filters. Once the cartridge is open media can be easily removed and reptaced by hand or a vacuum truck. Drain Down Filter Thedraindoenhltarkskonabadinthe Discharge Chamber. The dram filter unlocks from the wall mount and hinges up. Remove filter block and replace with new block, WETLANn'S wxw.mmoduUarwetUands.cwmm Instrument NumberDocument:COV Rec: S264.50 Page -45 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA Trim Vegetation Vegetation should be maintained in the same manner as surrounding vegetation and trimmed as needed. No fertilizer sha!I be used on the plants. Irrigation per the recommendation of the manufacturer and urlandscape architect, Different types of vegetation requires different amounts of irrigation. WETLANDS wom*nw'mmmdulmrwetlmnds.com Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -46 of 62 Record Date:9/26/2023 3:45 PM King County, WA M© D U L A R 1WETLA5 Inspection Form Modular Wetland System, Inc. P. 760.433-7640 F. 760-433-3176 E. Info@modularwetlands.com www.modularwetlands.com Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -47 of 62 Record Date:9/26/2023 3:45 PM King County, WA Inspection Report Modular Wetlands System Project Name Project Address Ovmer / Management Company Contact (001 150 0050 Inspector Name Phone Date Type of Inspection 0 Routine 0 Follow Up 0 Complaint 0 Storm Additional Notes Weather Condition ..offieeseeeddetkierieietiedi(Vidieffe. AMITime PM Storm Event in Last 72 -hours? 0 No 0 Yes Inspection Checklist Modular Welland System Type (Curb, Grate or UG Size (22, 14or elc.): Structural Integr : Yes No Comments Damage to pre4reatment access cover (manhole cover/grate) or can no I be opened using normal tilting pressure? Damage to discharge chamber access cover (manhole covedgrate) or cannot be opened using normal lifting pressure? Does the MWS unit show signs of structural deterioration (cracks in the wall, damage to (rame)? Is the inlet/outlet pipe or drain down pipe damaged or otherwise not functioning property? Working Condition: Is there evidence of iftit discharge or excessive all, grease. or other automobile fluids entering and clogging thi unit? Is there standing water M inappropriate areas after a dry period? Is the filler insert (if applicable) at capacity and/or is mom an accumulation of debrisgrash 00 00 shelf system? Dons the depth of sediment/trash/debris suggest 0 blockage of the inflow pipe, bypass or cartridge filter? If yes specify which one in the comments section, Note depth of accumulation in in pre-Irealment chamber. LleplIt Dots the cartridge IlIter media need replacement in pre-treatment chamber and/or discharge chamber? Chamber Any signs of Improper functioning in the discharge chamber? Note issues in comments section. Other Inspection Items: Is there an accumulation of sediment/trash/debris in Ise wetland media (if applicable)? is it evident that the plants are alive and healthy (if applicable)? Please note Plant Information below, Is there a septic or foul odor coming from inside the system'? Waste: Yes No Recommended Maintenance Plant Information Sediment 1 Silt 1 Clay No Cleaning Needed Damage lo Plants Trash 1 Bags / Bottles Schedule Maintenance as Planned Plant Replacement Green Waste / Leaves 1 Foliage Needs Immediate Maintenance Plant Trimming Additional Notes 2972 San Luis Rey Road, Oceanside, CA 92058 P (760)433-7640 F (760)433-3176 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -48 of 62 Record Date:9/26/2023 3:45 PM King County, WA U AR WE A DS Maintenance Report Modular Wetland System, Inc. P. 760.433-7640 F. 760-433-3176 E. Info@modularwetlands.com www.modularwetlands.com Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -49 of 62 Record Date:9/26/2023 3:45 PM King County, WA Cleaning and Maintenance Report Modular Wetlands System AL WETLANDS Project Name Project Address Omer / Management Company Contact ere Riv Curie Inspector Name Phone ( Date Type of inspection El Routine 0 Folimv Up El complaint 0 Storm Additional Notes Weather Condition Time 1/ Po-www.4.0T000.059/J91 AM 1 PM Storm Event in Last 72 -hours? 0 No 0 Yes Sae Map # GPS Coordinates of Insert Manufacturer / Description / Sizing Trash Accumulation Foliage Accumulation Sediment Accumulation Total Debris Accumulation Condition of Media 25/50/75/100 (will be changed tg 75%) Operational Per Manufactures' Specifications (if not, why?) Lat: MWS Catch Basins Lono: MWS Sedimentation Basin Media Filter Condition Plant Condition Drain Down Media Condition Discharge Chamber Condition Drain Down Pipe Condition Inlet and Outlet Pipe Condition Comments: 2972 San Luis Rey Road, Oceanside, CA 92058 760A33.7640 F. 760.433.3176 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -50 of 62 Record Date:9/26/2023 3:45 PM King County, WA �QSTADVANCED N Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -51 of 62 Record Date:9/26/2023 3:45 PM King County, WA 171 EISOL AT 0 : (-TN INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The StormTech Isolator Row is a technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy access for inspection and maintenance. THE ISOLATOR ROW The Isolator Row is a row of StormTech chambers, either SC-160LP, SC -310, SC -310-3, SC -740, DC -780, MC -3500 or MC -4500 models, that is surrounded with filter fabric and connected to a closely located manhole for easy access. The fabric -wrapped chambers provide for settling and filtration of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric. The open bottom chambers and perforated sidewalts (SC -310, SC- 310-3 and SC -740 models) allow storm water to flow both vertically and horizontally out of the chambers. Sediments are captured in the Isolator Flow protecting the storage areas of the adjacent stone and chambers from sediment accumulation. Two different fabrics are used for the Isolator Row. A woven geotextile fabric is placed between the stone and the Isolator Row chambers. The tough geotextile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non -woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. The non -woven fabric is not required over the SC-160LP, DC -780, MC -3500 or MC -4500 models as these chambers do not have perforated side walls. The Isolator Row is typically designed to capture the "first flush" and offers the versatility to be sized on a volume basis or flow rate basis. An upstream manhole not only provides access to the Isolator Row but typically includes a high flow weir such that storm water flowrates or volumes that exceed the capacity of the Isolator Row overtop the over flow weir and discharge through a manifold to the other chambers. The Isolator Row may also be part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil -water separators or can be innovative storm water treatment devices. The design of the treatment train and selection of pretreatment devices by the design engineer is often driven by regulatory requirements. Whether pretreatment is used or not, the Isolator Row is recommended by StormTech as an effective means to minimize maintenance requirements and maintenance costs. Note: See the StormTech Design Manual for detailed information on designing inlets for a StormTech system, including the Isolator Row. 7rAtormairs,, Looking down the isolator Raw from the manhole opening, woven gootextile is shown between the chamber and stone base StormTech Isolator Row with Overflow Spillway (not to scale) LTTTPi IIt Wfrf,M7, Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -52 of 62 Record Date:9/26/2023 3:45 PM King County, WA • - 17: 1,,,,,p,,Arty. INSPECTION The frequency of inspection and maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial, residential), anticipated pollutant load, percent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspections. Initially, the Isolator Row should be inspected every 6 months for the first year of operation. For subsequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to determine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean-out should be performed. MAINTENANCE The Isolator Row was designed to reduce the cost of periodic maintenance. By "isolating" sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed. If inspection indicates the potential need for maintenance, access is provided via a manhole(s) located on the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries. Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water nozzle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed back into the manhole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for culverts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45" are best. Most JetVac reels have 400 feet of hose allowing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by StormTech) over their angular base stone. StormTech Isolator Row (not to scale) Note: Non -woven fabric is only required aver the inlet pipe connection into the end cap for SC-160LP, 0C-780, MC -3500 and MC -4500 chamber mode's and is not required over the entire Isolator Row. fil,4111 1Iu 1 4114111/111111i1111/1/1111 Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -53 of 62 Record Date:9/26/2023 3:45 PM King County, WA STEP 1 Inspect Isolator Row for sediment. A) Inspection ports (if present) 1. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod,measure depth of sediment and record results on maintenance log. iv. If sediment is at or above 3 inch depth, proceed to Step 2. If not, proceed to Step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regulations for confined space entry if entering manhole iii. If sediment is at or above the lower row of sidewall holes (approximately 3 inches), proceed to Step 2. If not, proceed to Step 3. STEP 2 Clean out. Isolator Row using the JetVac process. A) A fixed floor cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable 13) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole sump as required STEP 3 Replace alt caps, lids and covers, record observations and actions. STEP 4 Inspect & clean catch basins and manholes upstream of the StormTech system. SAMPLE MAINTENANCE LOG 6-3 ft "o"t ,I;c:ateustattattom Fixed FoLmEt. C1 D7M /Z4/1i. 0.1 ft Some orLt feLE SM 4/20/13 0.6 fMuck? .fet., debri.s viz:Lb-Le ZIA mamt, L ' 7/7/13 6.3 FE Sjstemn jetted va vacuumed :!1)M *Z.Ttgrf. stornarech Instrument Number: 20230926000861 Document:COV Rec: 8264.50 Page -54 of 62 Record Date:9/26/2023 3:45 PM King County, WA OIL CONTAINMENT PAD O&M. THE STORM STRUCTURES AND PIPING UPSTREAM OF CB 31 IS AN OIL CONTAINMENT SYSTEM FOR THE TRANSFORMER. IT IS DESIGNED TO PROVIDE VOLUME TO CONTAIN ALL OF THE OIL FROM THE TRANSFORMER IF THER IS A LEAK. THE OIL WILL BE CONTAINED IN THE ROCK VOIDS AND THE STORM PIPE. A ENVIROTEMP VALVE WILL ALLOW WATER TO DRAIN DURING NORMAL CONDITIONS. IF OIL IS SENSED THE VALVE WILL CLOSE. IF THERE IS A LEAK THE OIL SHALL BE COMPLETELY REMOVED AND THE SYSTEM BELOW COMPLETELY RECONSTRUCTED FREE OF OIL. 8" NYLOPLAST AREA DRAIN WITH NON-CONDUCTIVE COVER, 24" NYLOPLAST AREA DRAIN WITH SOLID NON-CONDUCTIVE COVER. 65 LF 18" CPEP @ 0,00% Fr STORM DRAINAGE CLEANOUT LF 8" CPEP @ 0.45% 24" NYLOPLAST AREA DRAIN WITH — SOLID NON-CONDUCTIVE COVER. INSTALL ENVIROTEMP FR3 RATED PETRO PLUG, AND DRAIN TO CB #31_, 9 LF 6" CPEP @ 0.80% TRANSFORMER/OIL f 9 CONTAINMENT PAD. REFER TO C6.10 ELECTRICAL DRAWINGS, GRAVEL BACKFILL FOR DRYWELLS PER WSDOT 9-03.72(5) EXISTING GRADE II=III= fl} f11 -1I 111= 11 I1I 11 11-11 �l=11 GEMENT CONCRETE TRANSFORMER PAD NYLOPLAST DRAIN WITH NON-CONDUCTIVE COVER {1.0 ARi go. gr,ttIN 4 . fiklighiatZt two =1 !=111 11=J_i-fl' CEMENT CONCRETE PAVEMENT 2' CRUSHED SURFACING BASE COURSE PER WSOOT 9-03.9(3) COMPACTED SUBGRADE QOIL CONTAINMENT PAD NOT TO SCALE 1.0% MIN •--a OUTLET TO 24' NYLOPLAST DRAIN PER PLAN Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -55 of 62 Record Date:9/26/2023 3:45 PM King County, WA Appendix C Source Control BMPs Stormwater Operation and Maintenance Plan Foster High School Modernization and Addition 2160226.10160226.10 OmB� Instrument Number20230926000861 Document:COV Rec: S264.50 Page -56 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA S454 =MPfor Preventive Housekeeping ng �m� Good N0�~-���������� / ~������� Preventative maintenance and good housekeeping practices reduce the potential for stormwater to come into contact with pollutants and can reduce maintenance intervals for the drainage system and sewer system. Applicable BPAPs: • Prevent the discharge of unIiquid or solid wastes, process wastewater, and sewage to ground or surface water, or to storm drains that discharge to surface water, or to the ground. Conduct all oily parts cleaning, steam cleaning, or pressure washing of equipment or containers inside a building, or on an impervious contained area, such as a concrete pad. Dir- ectcontmnninotedstormm/etarfrornsuchanansat000anitarysevvervvhenea||ovvedby|ooa| sewer authority, or to other approved treatment. • Promptly contain and clean up solid and liquid pollutant leaks and spills including oils, solvents, fuels, and dust from manufacturing operations on an exposed soil, vegetation, or paved area. • If a contaminated surface must be pressure washed, collect the resulting washwater for proper disposal (usually involves plugging storm drains, or otherwise preventing discharge and pumping or vectoring up washwater, for discharge to sanitary sewer or for vector truck transportto a waste water treatment plant for disposal). o Do not hose down pollutants from any area to the ground, storm drains, conveyance ditches, or receiving water. Convey pollutants before discharge to a treatment system approved by the local jurisdiction. " Sweep all appropriate surfaces with vacuum sweepers quarterly, or more frequently as needed, for the collection and disposal of dust and debris that could contaminate stornriwater. Use mechanical sweepers, and manual sweeping as necessary to access areas that a vacuum sweeper can't reach to ensure that all surface contaminants are routinely removed. o Do not pave over contaminated soil unless it has been determined that ground water has not been and will not be contaminated by the soil. CaU Ecology for assistance. • Construct impervious areas that are compatible with the materials handled. Portland cement concrete, asphalt, or equivalent material may be considered. • Use drip pans to collect leaks and spills from industrial/commercial equipment such as cranes at ship/boat building and repair facilities, log stackers, industrial parts, trucks and other vehicles stored outside. • At industriaand commercial facilities, drain oil and fuel filters before disposal. Discard empty oil and fuel filters, oily rags, and other oily solid waste into appropriately closed and properly labeled containers, and in compliance with the Uniform Fire Code or International Building Code. • For the storage of liquids use containers, such as steel and plastic drums, that are rigidond Instrument Number20230926000861 Document:COV Rec: S264.50 Page -57 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA durable, corrosion resistant to the weather and fluid content, non-absorbent, water tight, rodent -proof, and equipped with a close fitting cover. o For the temporary storage of solid wastes contaminated with liquids or other potential polluted materials use dumpsters, garbage cans, drums, and comparable containers, which are dur- able,oonoaionreointont.non-mbsorbent.non-|aoking.ondaquippedvvithe|theraao|idoover or screen cover to prevent littering. If covered with a screen, the container must be stored under a roof or other form of adequate cover. o Where exposed to stormwater, use containers, piping, tubing, pumps, fittings, and vaives that are appropriate for their intended use and for the contained liquid. ~ Clean oils, debris, sludge, etc. from all stornnwater facilities regularly, including catch basins, settling/detention basins, oil/water separators, boomed areas, and conveyance systems to prevent the contamination of stornnwater. Refer to Ecology Requirements for Generators of Dangerous Wastes in 1-2.15 Other Requirements for references to assist in handling poten- tiallydmnOeroumxvamte. o Promptly repair or replace all substantially cracked or otherwise damaged paved secondary containment, high-intensity parking, and any other drainage areas, subjected to pollutant material leaks or spills. Promptly repair or replace all leaking connections, pipes, hoses, valves, etc., which can contaminate stormwater. o Do not connect floor drains in potentialpoUutantoourcoarmastontonndnains.surfacevvaber. or to the ground. Recommended BMPs: o Where feasible, store potential stormwater pollutant materials inside a building or under a cover andfor containment. o Minimize use of toxic cleaning solvents, such as chlorinated solvents, and other toxic chem- icals. • Use environmentally safe raw materials, products, additives, etc. such as substitutes for zinc used in rubber production. � Recycle waste materials such as solvents, coolants, oils, degreasers, and batteries to the max- imum extent feasible. Contact Ecology's Hazardous Waste & Toxics Reduction Program at https://ecology.wa.gov/About-us/Get-to-know-us/Our-Programs/Hazardous-Waste-Toxics- Reduction for recommendations on recycling or disposal of vehicle waste liquids and other waste materials. ~ Empty drip pans immediately after a spill or leak is collected in an uncovered area. o Stencil warning signs at stormwater catch basins and drains, e.g., "Dump no waste — Drains to waterbody" " Use solid absorbents, e.g., clay and peat absorbents and rags for cleanup of liquid spills/leaks, where practicable. o Promptly repair/replace/reseal damaged paved areas at industrial facilities. Instrument Number20230926000861 Document:COV Rec: S264.50 Page -58 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA o Recycle materials, such as oils, solvents, and wood waste, to the maximum extent prac- ticable. Note: Evidence of stormwater contamination by oils and grease can include the presence of visible sheen, color, or turbidity in the runoff, or present or historical operational problems at the facility. Operators can use simple pH tests, for example with litmus or pH paper. These tests can screen for high or low pH levels (anything outside a 6.5-8.5 range) due to contamination in stornnwater. S455 BMPs fo Spill Prevention and Cleanup Description of Pollutant Sources: Spills and leaks can damage public infrastructure, interfere with sewage treatment, and cause a threat to human health or the environment. Spills are often pre- ventable if appropriate chemical and waste handling techniques are practiced effectively and the spill response plan is immediately implemented. Additional spill control requirements may be required based on the specific activity occurring on site. Applicable BMPs: Spill Prevention o Clearly label or mark all containers that contain potential pollutants. • Store and transport liquid materials in appropriate containers with tight -fitting lids. • Place drip pans underneath all containers, fittings.valves, and where materials are likely bJ spiU or leak. o Use tarpaulins, ground cloths, or drip pans in areas where materials are mixed, carried, and applied to capture any spilled materials. ~ Train employees on the safe techniques for handling materials used on the site and to check for Ieaks and spills. Spill Plan • Develop and implement a spill plan and update it annually or whenever there is a change in activities or staff responsible for spill cleanup. Post a written summary of the plan at areas with a high potential for spills, such as loading docks, product storage areas, waste storage areas, and near a phone. The spill plan may need to be posted at multiple locations. Describe the facility, including the owner's name, address, and telephone number; the nature of the facility activity; and the general types of chemicals used at the facility. • Designate spill response employees to be on-site during business activities. Provide a current list ofthe names and telephone numbers (home and offine)ofdesignated spill response employees who are responsible for implementing the spill plan. o Provide a site plan showing the locations of storage areas for chemicals, inlets/catch basins, spill kits and other relevant infrastructure or materials information. • Describe the emergency cleanup and disposal procedures. Note the location of all spill kits in Instrument Number20230926000861 Document:COV Rec: S264.50 Page -59 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA the spill plan. o List the names and telephone numbers of public agencies to contact in the event ofospill. SpiII Cleanup Kits o Store all cleanup kits near areas with a high potentialfovaoUlssothadthavonaeasUvanness- ibksintheeventofaopiU.ThecontentsofthespiUkitrnuetbeapprophatetothetypeoand quantities of materials stored or otherwise used at the facility, and refilled when the materials are used. Spill kits must be located within 25 feet of all fueling/fuel transfer areas, including on- board mobie fuel trucks. Note: Ecology recommends that the kit(s) include salvage drums or containers, such as high density polyethylene, polypropylene or pone sheet -lined steel; polyethyleneorequi- vo|entdispnsa|baga;anenmer0enoynaoponme0uidmbook; safety gloves/clothes/equipment; shovels or other soil removal equipment; and oil containment booms and absorbent pads; all stored in an impervious container. Spill Cleanup and Proper Disposal of Waste ^ Stop, contain, and clean up all spilis immediately upon discovery. • Implementthe spill plan immediately. o Contact the designated spill response ernployees. o Biock off and seal nearby inlets/catch basins to prevent materials from entering the drainage system or combined sewer. • Use the appropriate material to clean up the spill. • Do not use emulsifiers or dispersants such as liquid detergents or degreasers unless disposed of proplerly. Emulsifiers and dispersants are not allowed to be used on surface water, or in a place where they may enter storm drains, surface waters, treatments systems, or sanitary sewers. ~ Immediately notify Ecology and the local jurisdiction if a spill has reached or may reach a san- itary or storm sewer, ground water, or surface water. Notification must comply with state and federal spill reporting requirements. o Do not wash absorbent material into interior floor drains or inlets/catch basins. • Place used spill control materials in appropriate containers and dispose of according to reg- ulations. S456 BMPs for Employee Training ng Train all employees that work in pollutant source areas about the following topics: . Identifying Pollution Prevention Team Members. Instrument Number20230926000861 Document:COV Rec: S264.50 Page -60 of 62 RouordDuNo:9/26/2#23 3:45 PM King County, WA ^ Understanding pollutant control measures. " SpiII prevention and response. " Emergency response procedures. o Handling practices that are environmentally acceptable. Particularly those related to vehicle/equipment liquids such as fuels, and vehicle/equipment cleaning. Additional specialized training may be needed for staff who will be responsible for handling haz- ardousrnaterio|s. S457 BMPS for Inspections Qualified personnel shall conduct inspections monthly. Make and maintain a record of each inspec- tion on-site. The following requirements apply to inspections: o Be conducted by someone familiar with the facility's site, operations, and BMPs. o Verifythe accuracy ofthe pollutant source descriptions in the SWPPP. o Assess all BMPs that have been implemented for effectiveness and needed maintenance and Iocate areas where additional BMPs are needed. o Reflect current conditions on the site. o Include written observations of the presence of floating materials, suspended solids, oil and grease, discoloration, turbidity and odor in the stormwater discharges; in outside vehicle main- tenance/repair; and liquid handling, and storage areas. In areas where acid or alkaline mater- ialsanahand|edoratonaduoeooinnp|e|itnnuoorpHpopertoidentifvthoseh/ponof stormwater contaminants where needed. ~ Eliminate or obtain a permit for unpermitted non-stormwater discharges to storm drains or receiving waters, such as process wastewater and vehicle/equipment washwater. = Identify actions to address irispection deficiencies. S458 BMPs for Record Keeping m������Nng See the applicable permit for specific record-keeping requirements and retention schedules for the following reports. At a minimum, retain the foliowing reports for five years: o Inspection reportswhich should include: " Time and date ofthe inspection O Locations inspected O Statement on status of compliance with the permit O Summary report of any remediation activities required O Name, title, and signature ofperson conducting the inspection Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page -61 of 62 Record Date:9/26/2023 3:45 PM King County, WA . Reports on spills of oil or hazardous substances in greater than Reportable Quantities (Code of Federal Regulations Title 40 Parts 302.4 and 117). Report spills of the following: antifreeze, oil, gasoline, or diesel fuel, that cause: o A violation of the State of Washington's Water Quality Standards. o A film or sheen upon or discoloration of the waters of the State or adjoining shorelines. O A sludge or emulsion to be deposited beneath the surface of the water or upon adjoin- ing shorelines. INCASE OF A SPILL CONTACT THE FOLLOWING: CITY OF TUKWILA HOTLINE: 206-A31-1860 TUKWILA SCHOOL DISTRICT FACILITIES: 206-901-8020 LILIANA CARDENAS - DIRECTOR OF MAINTENANCE, OPERATIONS AND CAPITAL PROJECTS WASHINGTON EMERGENCY MANAGEMENT DIV. 1-800-0ILS-911 (DURING BUSINESS HOURS NORTHWEST REGION OFFICE 206-594-0000'1 The following is additional recommended record keeping: Maintain records of all related pollutant control and pollutant generating activities such as training, materials purchased, material use and disposal, maintenance performed, etc. Instrument Number: 20230926000861 Document:COV Rec: S264.50 Page-62 of 62 Record Date:9/26/2023 3:45 PM King County, WA