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HomeMy WebLinkAbout2021 - Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPS - 3400 S 148th St LLC / City of Tukwila - 20210901001048Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -1 of 27 Record Date:9/1/2021 2:04 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: ' Additional reference numbers at page 2 of document. GRANTOR: 3400 S 148th St LLC GRANTEE: City of Tukwila, a Washington Municipal Corporation ABBREVIATED LEGAL DESCRIPTION: Full legal on page 5 of document. KING COUNTY TAX PARCEL NUMBER: 2044000025 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -2 of 27 Record Date:9/1/2021 2:04 PM King County, WA DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE OF STORMVVATER 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 3400 5 148th Street LLC, as Grantor, and the City of Tukwila, 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 Public Works Construction Permit on December 1, 2020. 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. 2044000025 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. PW20-0100, Exhibit B. 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 [number and date], 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 City ofTukwila Page I Stormwater Maintenance Declaration of Covenant Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -3 of 27 Record Date:9/1/2021 2:04 PM King County, WA 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. 3.3.2 If the City ciefermines 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. Overdpe 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 Jen Wickens (206) 712 7640 3400 S 148th St LLC 14606 35th Ave S, 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 City of Tukwila Stormwater Maintenance Declaration of Covenant Page 2 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -4 of 27 Record Date:9/1/2021 2:04 PM King County, WA 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 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: DATE: 0 /20 I &ff-ree9, 627e67,,,te/t Emily Miner City Attorney 08/26/2021 FOR GRANTEE: City ofTukwila Hari Ffonnekanti Public Works Director DATE: g NOTARY BLOCKS APPEAR ON FOLLOWING PAGE City of Tukwila Stormwater Maintenance Declaration of Covenant Page 3 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -5 of 27 Record Date:9/1/2021 2:04 PM King County, WA STATE OF WASHINGTON ss. COUNTY OF KING before me, and said person acknowledged that sthe signed this instrument on behalf of the %%near Wolk %0Nool5 and 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 (-1-' day of I certify that o:\;:h:ve satisfactory , otko, , 2021. evidence that 3 is is the person who appeared I, TN TA ' o 0,„:*„ -:Prin ea 199303 """ NOTARY PUBLIC in and for the State of Washington, residing at My Commission Expires 07, fOgre.ceZ ?fe W '*ejElt"\ 0 —57,01,11, 4" /.\ 1111 OF wAs\A 1111%1\m\ws, STATE OF WASHINGTON COUNTY OF KING ss. On this day personally appeared before me an , to me known to be the 1 IA,47/ ( 1:(2 ( &S -)irec-f-c-)c 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.24, Y -C day of 5 f-- , 2021. , ein ijio , O /c . WAS \-\\ 11111\ woN‘S% City ofTukwila Stormwater Maintenance Declaration of Covenant a6-c-c.c a G PrintectiClarrie /-&i1 t" NOTARY PUBLIC in and for the State of Washington, residing at72---(Ktcji( (-1 My Commission Expires )5/ /3,-D Page 4 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -6 of 27 Record Date:9/1/2021 2:04 PM King County, WA EXHIBIT "A" Legal Description Parcel A: Lots 1, 2 and the north 53 feet of Lot 3, Block 2, J. E. Dixon's 1st Addition, according to the plat thereof recorded in Volume 54 of Plats, Page 52, in King Councy, Washington. Parcel B: The south 22 feet of Lot 3 and all of Lot 4, Block 2, J. E. Dixon's 1st Addition, according to the plat thereof recorded in Volume 54 of Plats, Page 52, in King Councy, Washington. Parcel C: Lot 2, Block 1, J. E. Dixon's 1st Addition, according to the plat thereof recorded in Volume 54 of Plats, Page 52, in King Councy, Washington. Parcel D: Lots 30 and 31, Block 7, Adams Home Tracts, according to the plat thereof recorded in Volume 11 of Plats, Page 31, in King County, Washington; Except the South 10 feet of Lot 31 conveyed to King County for road by deed recorded under recording number 2978341; And except the South 10 feet of Lot 30 for South 148th Street. imem Copyright American Land Title Association. All rights reserved. 1.4111 TI1I,F The use of this Form (or any derivative thereof) is restricted to ALTA licensees and ALTA members In good standing as of the date of use. All other uses are prohibited. Reprinted under license from the American Land Title Association. ALTA Commitment (08117/2008) Printed: 052217 0 08:59 AM Page WA-CT-FNSE-02150.622476-SPS-1-17-0096363-06 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -7 of 27 Record Date:9/1/2021 2:04 PM King County, WA EXHIBIT B Permit [attached] City of Tukwila Stormwater Maintenance Declaration of Covenant Page 6 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -8 of 27 Record Date:9/1/2021 2:04 PM King County, WA City of Tukwila Department of Public Works 6300 Southcenter Boulevard, Suite #100 Tukwila, Washington 98188 Phone: 206-433-0179 Inspection Scheduling: https://tukw-egov.aspgov.com/BP/index.html Web site: http://www.TukwilaWA.gov PUBLIC WORKS CONSTRUCTION PERMIT Parcel No: 2044000025 Permit Number: PW20-0100 Address: 14606 35TH AVE 5 Issue Date: 12/1/2020 Permit Expires On: 5/30/2021 Project Name: IMPACT PUBLIC SCHOOLS Owner: Name: 3400 5 148TH STREET LLC Address: 3438 5 148TH ST, TUKWILA, WA, 98168 Contact Person: Name: JAMES HEUGAS Phone: (510) 384-0329 Address: 107 SPRING STREET, SEATTLE, WA, 98104 Contractor: Name: JOHN KORSMO CONSTRUCTION INC Address: PO BOX 1377, TACOMA, WA, 98401 License No: JOHNKC1126BE Phone: (253) 582-6712 Expiration Date: 1/1/2022 DESCRIPTION OF WORK: GRADING OF THE SITE. INSTALLATION OF FIRE, DOMESTIC WATER, SEWER AND STORM WATER DETENTION AND OFFSITE IMPROVEMENTS AROUND THE NORTH AND WEST BOUNDARIES OF THE PROPERTY. INCLUDES FRONTAL IMPROVEMENTS. PROJECT ON VALLEY VIEW SEWER & WD #125 WATER. Fees Collected: $117,809.70 Electrical Service Provided by: Seattle City Light Water District: 125 Sewer District: Valley View Public Works Activities: Channelization/Striping: Curb Cut/Access/Sidewalk: Fire Loop Hydrant: Flood Control Zone: Hauling/Oversize Load: Land Altering: Landscape Irrigation: Sanitary Side Sewer: Sewer Main Extension: Storm Drainage: Street Use: Water Main Extension: Volumes: Cut: 125 Fill: 300 Number: 0 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Pof 27 ������U������/ /����������� County, WA - Record -.—_-_-_ 2:04 PM _ —~�, ,.-- Water Meter: No 4Up,ovisionsoflawandmdinanoes govern;ng this work will be complied with,whether specified herein or not. The granting of this permit does not presume to give authority to violate or cancel the provisions of any other state or local laws regulating construction or the performance of work. This permit shall become null and void if the work is not commenced within 180 days for the date of issuance, or if the work is suspended or abandoned for a period of 180 days frorn the last inspection. PERMIT CONDITIONS: 1: All valves controlling the water supply for automatic sprinkler systems and waterflow switches on all sprinkler systems shall be elecrically supervised. 8: All new fire alarm systems or modifications to existing systems shall have the written approval of The Tukwila Fire Prevention Bureau. No work shaU commence until a fire department permit has been obtained. (City Ordinance wz«y7)(IFC eo1.z) 2: All exterior components of sprinkler systems should be painted SAFETY RED. This includes: Post indicator valves (PIV), outside stem and yoke (OSY), wall indicator valves (WIV), and Fire Department connection (FDC).. (City Ordinance #2436) 4: All piping and attached appurtenances subjected to system working pressure shall be hydrostatically tested at 200 psi (13.8 bar) or 50 psi (3.5 bar) in excess of the system working pressure, whichever is greater, and shall maintain that pressure at /-spsi (n.asbar) for zhours. Contact the Public Works Department atxna' 433-0179 to make an appointment. (NFPA 24, sec. 10.10.2.2.1) 5: The fire department connection (FDC) shall have a downward angle bend between 22.5 and 45 degrees, with as'\nchStorz fitting(s) and Knox FDC locking Storz cap. (City Ordinance #2436) 6: The height of the FDC shall be 36 to 48 inches above grade. 7: 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 address served by the FDC stenciled vertically in 3 -inch high white numbers on a "safety red" background directly beneath the hose connection facing the direction of vehicular access, and protected from potential vehicular damage. 9: Hydrants shall not be closer than 4 feet to any fixed object (e.g., fences, parking, building, etc.), with the exceptjon of hydrant guard posts. Guard posts shall be installed around hydrants not protected by curbs, so as to help prevent rriotor 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 finish shall be the same color as for the applicable hydrants. The 4 - foot circumference around the hydrant will be a tevel surface. (City Ordinance wzosa) 11: FIRE PERMIT REQ - FIRE ALARM 3: Contact The Tukwila Fire Prevention Bureau to witnesalt required inspectionsand tests. (City Ordinances #z4asand wzxs7) 10: Any overlooked hazardous condition and/or violation of the adopted Fire or Building Codes does not imply approval nfsuch condition o,violation. 12: *PUBLlC WORKS PERMIT CONDITIONS*** 13: Call to schedule mandatory pre -construction meeting with the Public Works Inspector, (206) 438-9350. 14: Schedule and attend a Preconstruction Meeting with the Public Works Department prior to start of work under this permit. To schedule, call Public Works at (206) 438-9350. Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -10 of 27 ������U������/ /����������� County, WA - Record -.—_-_-_ 2:04 PM _ —~�, ,.-- 15: The applicant or contractor must notify the Public Works Inspector at (206) 438-9350 upon commencement and cornpletion of work at east 24 hours in advance. All inspection requests for utility work must also be made 24 hours in advance. 16: Prior to construction, all utUities n the vicinity shall be field Iocated. NOTE: For City ofTukwila utility locates, call ozzor1-000'«z+ssss. 17: Permit is valid between the weekday hours of 7:00 a.m. and 5:00 p.m. only. Coordinate with the Public Works Inspector for any work after 5:00 p.rn. and weekends. 18: No work under this permit during weekend hours without prior approval by Public Works. Coordinate with the Public Works Inspector. 19: Work affecting traffic flows shall be ck,sely coordinated with the Public Works Inspector. Traffic Control Plans shall be submitted to the lnspector for prior approvat. 20: 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. 21: Flagging, signing and coning shall be in accordance with MUTCD for Traffic Control. Contractor shall provide certified flagmen for traffic control. Sweep or otherwse clean streets to the satisfaction of Public Works each night around hauling route (No flushing aflowed). Notify Public Works nspector before 12:00 Noon on Friday preceding any weekend work. 22: Any material spied onto any street shall be cleaned up immediately. 23: Temporary erosion control measures shall be implemented as the first order of business to prevent sedimentation off-site or into existing drainage facilities. 24: The site shall have permanent erosion control measures in place as soon as possible after final grading has been completed and prior to the Final lnspection. 25: The Land Altering Permit Fee is based upon an estimated cubic yards of excavation. If contaminatiori is detected, the land altering quantity and permit fee will change. The applicant will be required to calculate final quantities and pay the difference in permit fee prior to the Final Inspection. 26: From October 1 through April 30, cover any siopes and stockpiles that are 3H:1V or steeper and have a vertkal 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 foltowing storms, 27: From May 1 through September 30, inspect and maintain temporary erosion prevention and sediment at least monthly. All disturbed areas of the site shall be permanently stabilized prior to final construction approval. 28: 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. 29: The applicant shall install a Washington State Health Department approved backflow device between the fire hydrant and the temporary water meter. 30: Applicant shall obtain sanitary side sewer permit from Valley View District (206-242-3236). 31: It shall be verified in writing to the Public Works Inspector that the Iandscape irrigation system contains a State Department of Health approved double check vaive assembly. This shall be done prior to the Final Inspection. 32` Driveway shall comply with City commercial standards. Driveway width shall be a 25' minimum and 35 maximum. Siope shall be a maximum of 15%. Turning radii shall be a minimum of 10', 33: The new sidewalk on private property shall be turned over to the City along with appropriate recorded easement documentation prior to the Final nspection. 34: 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.) 35: Construction equipment shall be kept off af existing 5 foot wide pedestrian path, as much as possible, to avoid damage of asphalt. Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -11 of 27 Record Date:9/1/2021 2:04 PM King County, WA 36: Pavement mitigation fees may apply to this permit. Amount estimated to be xxx sq. ft. x $xx.xx per sq. ft. = $x,xxx.xx. Final measurement to be made in the field by the Public Works Inspector prior to Public Works Final, PERMIT INSPECTIONS REQUIRED Permit Inspection Line: (206) 438-9350 5170 BACKFLOW - IRR 5000 CURB ACCESS SOW 5200 EROSION MEASURES 5210 EROSION MEASURES FNL FIRE ALARM FINAL 5020 FIRE LOOP HYDRANT FIRE PW PERMIT FINAL 5040 LAND ALTERING 5230 PAVING AND RESTORE 1600 PUBLIC WORKS FINAL 5160 PUBLIC WORKS PRE -CON 5090 STORM DRAINAGE 5100 STREET USE 5130 WATER METER - PERM Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -12 of 27 Record Date:9/1/2021 2:04 PM King County, WA EXHIBIT C Stormwater FadlityBMP Site Plan f attached City of Tukwila Stormwater Maintenance Declaration of Covenant Page 7 ;, Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -13 of 27 Record Date:9/1/2021 2:04 PM King County, WA PUBLIC CBBri CPE2 FACUTY SDI16A CB TYPE 2 S0415 CB 2 PUBLIC CB SDt14, AREA DRAIN SD113 EXHIBIT C - MAINTENANCE EXHIBIT IMPACT SALISH SEA ELEMENTARY EXPANSION Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -14 of 27 Record Date:9/1/2021 2:04 PM King County, WA EXHIBIT D Operations & Maintenance Plan with Schedule [attached] City of Tukwila Stormwater Maintenance Declaration of Covenant Page 8 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -15 of 27 Record Date:9/1/2021 2:04 PM King County, WA Exhibit D INSPECTION / MAINTENANCE CHECKLIST 1— Yearly (August or September) and after major storm events per manufacture's recommendations 2 — Twice a year 3- Monthly STRUCTURE Inspection INSPECTION RESULTS AND MAINTENANCE DONE Inspection Results/ Maintenance Date Comments Catch basins, trench drains and manholes 1 Inspection Results Maintenance Done Stormtech Detention Tank 1 Inspection Results Maintenance Done Conveyance Pipes 1 Inspection Results Maintenance Done Grounds/ Landscaping 1 Inspection Results Maintenance Done CB #7 Type 2-54" 1 Inspection Results Maintenance Done CB #12 Type 1 1 Inspection Results Maintenance Done CB #13 Type 1 1 Inspection Results Maintenance Done CB #15 Type 2 1 Inspection Results Maintenance Done Page 1 of 2 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -16 of 27 ������U������/ /����������� County, WA - Record -.—_-_-_ 2:04 PM _ —~�, ,.-- CD#1§Type 2 1 Inspection Results Maintenance Done C8#z64Type Z 1 Inspection Results Maintenance Done Ao#zArea Drain 1 Inspection Results Maintenance Done AD#ZArea Drain I Inspection Results Maintenance Done xo#3Area Drain 1 Inspection Results Maintenance Done Ao#oArea Drain 1 Inspection Results Maintenance Done AD#9Area Drain 1 Inspection Results Maintenance Done AD01OArea Drain 1 Inspection Results Maintenance Done Ao#14Area Drain 1 Inspection Results Maintenance Done SDCO #4 1 Inspection Results Maintenance Done Page 2 of 2 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -17 of 27 Record Date:9/1/2021 2:04 PM King County, WA 2R0 Isolator Row 1 spec 11/Maintenance 2.1 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, per- cent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspec- tions. 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 deter- mine 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. 2.2 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 main- tenance, 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. StormTech Isolator Row (not to scale) OPOOKALIESESEIXIN PORT LOG ENOPIEERS CAPPING W1100 FM 0 PVC TOPJ VIMI11.111. StormTeh• Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water noz- zle 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 man- hole 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 cul- verts 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 allow- ing 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. COVER MORE ROW %WHAM GMT NONWOVEN OECTLEPLE (OP MAL) POPP • et rL4 WIDEOTRIP io sos1o4- tr (1.13 WM MOP 01OPUTEC11 END CAP (0400 MON) 50.4441. 0O400.14C4500 01404600 .24* POO twO PIPE Frt.410 Be-sioa. IT 300 nrE PPE DIMMER (CC -740 MOM) MERE OF 469 3110 WOVEN OEDTPCFLE (OR EQUAL) IlEONFEN STOW BASF AND CHAMEAS 1404000 • 103 (3.1 PEW PRP POE 3tevrrwl PAP,O502. EIS (1.3o( WOE STRP (0193 MOWN) 00440 CCM° (IA m)WDE PPP vos El PETM 0C410 804104 • 4' (12 m),WIDE STRIP (ADS 316Wrig NOTE: NON -WOVEN FABRIC IS ONLY REQUIRED OVER THE INLET PIPE CONNECTION INTO THE END CAP FOR DC -780, MC -3500 AND MC -4500 CHAMBER MODELS AND IS NOT REQUIRED OVER THE ENTIRE ISOLATOR ROW. Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -18 of 27 Record Date:9/1/2021 2:04 PM King County, WA 3.0 isolator Row Step By Step Maintenance Proc d Step 1) Inspect Isolator Row for sediment A) Inspection ports (if present) 1) 13) i. Remove lid from floor box frame ii. Remove cap from inspection riser 11. 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 0. 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 culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until backftush water is clean C) Vacuum manhole sump as required Step 3) Replace all caps, lids and covers, record observations and actions Step 4) Inspect & clean catch basins and manholes upstream of the StormTech system StormTech Isolator Row (not to scale) I11Wai illniVr L1 I AT illiglin res 1) A) Sample Maintenance Log jlt'f (WO' 6.5 ft. New installation. Fixed pint is Cl frame at grade Some grit felt Mucky feel, debris visible in manholeari4 in Isolator row, maintenance due ystern jetted and vacuumed 4444 StormTeche Detention • Retention • Water Quality division of ER! AZ. 70 Inwood Road, Suite 3 Rocky Hill I Connecticut I 06067 860.529,8188 888.892.2694 I fax 866.326,8401 I www.stormlech.com ADS "Terms and Conditions of Sale" are available on the ADS website, www.ads-pipe.com Advanced Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage Systems. Stormtech® and the IsolatorRow are registered trademarks of StormTech, Inc. Green Building Council Member logo is a registered trademark of the U.S. Green Building Council. © 2013 Advanced Drainage Systems, Inc. S090809 02/13 djm sm ry cljm Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -19 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NCI 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. Grass/groundcover 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 tank (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 ''/ length of tank. 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 '%-inch at the joint of any tank sections or any evidence of soil particles entering the tank at 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 ftoatables and non-floatables), 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-5 4/24/2016 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -20 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO 3 DETENTION TANKS' AND ti. 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 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. 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: 20210901001048 Document:COV Rec: $229.50 Page -21 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO4 . CONTROL STRUCTURE/FLOW:RESTRICTOR 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 foot which is located immediately in front of the structure opening or is blocking capacity of the structure by more than 1O%. 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 foot 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 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 'h inch. Top slab is free of holes and cracks. Frame not sitting flush on top slab, i.e., separation of more than % 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 % 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 %-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 Y. -inch wide at 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 tight; 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 4/24/2016 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -22 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NQ 4 CONTROL STRUCTURE/FLOW RESTRICTOR rt Maintenance Component Defect or Problem Condition When Maintenance is Needed Results Expected When Maintenance is Performed Cleanout Gate Damaged or missing Cleanout gate is missing. Replace cleanout gate. Cleanout gate 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 properly 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 lip Lip of overflow pipe is bent or deformed. Overflow pipe does not allow overflow at an elevation lower than design 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 Iloatables and non-Ooatables). No trash or debris in pipes. Damaged Cracks wider than '4 -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. Metal Grates (If Applicable) Unsafe grate opening Grate with opening wider than 7/e 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 for 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 Water Design Manual — Appendix A Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -23 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO 5 CATCH BASINS AND MANH©LES 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 %3 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'/. 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 catch basin through cracks, or maintenance person judges that catch basin is unsound. Catch basin is sealed and is structurally sound. Cracks wider than %z inch and longer than 1 foot at the joint of any inlet/outlet plpe or any evidence of soil particles entering catch basin through cracks. No cracks more than 1/4 inch wide at the joint of inlevoutlet 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'A-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the catch basin at the joint of the inlet/outlet pipes. No cracks more than''V.-inch wide at 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. 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 tloatables and non-floatables). 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. 2016 Surface Water Design Manual — Appendix A A-9 4/24/2016 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -24 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES 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 Ile 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 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. 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 2016 Surface Water Design Manual — Appendix A A-10 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -25 of 27 Record Date:9/1/2021 2:04 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. Water 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 coating 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 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. 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 Tess 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-11 4/24/2016 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -26 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO.11 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 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. 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-16 Instrument Number: 20210901001048 Document:COV Rec: $229.50 Page -27 of 27 Record Date:9/1/2021 2:04 PM King County, WA APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES NO. 29 - PERFORATED PIPE CONNECTIONS.BMP Maintenance Component Defect or Problem Conditions When Maintenance is Needed Results Expected When Maintenance is Performed Preventative Blacking, obstructions Debris or trash limiting flow into perforated pipe system or outfall of BMP is plugged or otherwise nonfunctioning. Outfall of BMP is receiving designed flows from perforated pipe connection. Inflow Inflow impeded Inflow into the perforated pipe is partially or fully blocked or altered to prevent flow from getting into the pipe. Inflow to the perforated pipe is unimpeded. Pipe Trench Area Surface compacted Ground surface aver the perforated pipe trench is compacted or covered with impermeable material. Ground surface over the perforated pipe is not compacted and free of any impervious cover. Outflow Outflow impeded Outflow from the perforated pipe into the public drainage system is blocked. Outflow to the public drainage system is unimpeded. Outfall Area Erosion or landslides Existence of the perforated pipe is causing or exasperating erosion or landslides. Perforated pipe system is sealed off and an alternative BMP is implemented. Inspection Frequency Annually and prior to and following significant storms. Perforated pipe system is operating as designed. 2016 Surface Water Design Manual — Appendix A A-37 4/24/2016