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HomeMy WebLinkAbout20091118001265 STORM WATER EASEMENT AND MAINTENANCE AGREEMENT 091108Return Address: City of Auburn City Clerk 25 West Main Auburn, WA 98001 Above this line reserved for recordine information. STORM WATER EASEMENT AND MAINTENANCE AGREEMENT ~ v ply k FAC08-0010 ti I?~~Cl~ ~Z- Reference # (if applicable): N/A Grantor/Borrower: Cox and Woodward, LLC Grantee/Assignee/Beneficiary: City of Auburn Legal Description/STR: NE '/4 SE %5 S18 - T21N - R5E 1 Assessor's Tax Parcel ID4: 2149800275, 2149800276, 2149800277, 2149800278 THIS EASEMENT AND AGREEMENT made and entered into this ~a day of z ti,h.Ah 2008, by and between the City of Auburn, a municipal corporation of King County, Washington, hereinafter referred to as "CITY" and Cox and Woodward, LLC hereinafter referred to as "PROPERTY OWNER". WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY for the construction of facilities for Cox and Woodward, LLC located at 1310-13163 d Street SE, which create impervious surface; and WHEREAS, the PROPERTY OWNER will complete a storm system; and WHEREAS, the PROPERTY OWNER and the CITY desire that the storm system be maintained to provide adequate facilities for controlling both the quantity and quality of storm drainage; and WHEREAS, for maintenance of a storm system it is necessary to have appropriate right-of-way to bring in equipment to conduct maintenance functions; and WHEREAS, maintenance requirement is a covenant running with the land and binding upon all heirs, successors and assigns of both parties; and Storm Water Easement and Maintenance Agreement Page I of 18 WHEREAS, the parties desire that this Agreement be recorded to advise heirs, successors and assigns of both parties as to the existence of this easement and agreement; and WHEREAS, an easement is needed to bring in maintenance equipment; and WHEREAS, the parties are both desirous of permitting inspection of the storm system to make certain that it is functioning properly and for purposes of determining the appropriate repairs. NOW, THEREFORE, BASED UPON MUTUAL COVENANTS TO BE DERIVED THE PARTIES AGREE AS FOLLOWS: Section 1, EASEMENT PROPERTY OWNER hereby provides a non-exclusive easement to the City for access, inspection, and maintenance for the purposes of this Agreement and the attached Storm Water Pollution Prevention Plan, over, under and on that real estate described in Exhibit "A" & "B" and on that portion of the property as showing on the approved Record Drawings revised pursuant to construction records for the City of Auburn under Permit No. FAC08-0010, which record drawings are hereby incorporated by reference as if set out in full. This easement shall be a burden to that real estate which is legally described and attached as Exhibit "A" & "B" and incorporated herein by this reference, and shall be a benefit to the City Storm Drainage Utility System. Section 2, HEIRS, SUCCESSORS AND ASSIGNS This Agreement shall be binding upon the heirs, successors and assigns of the parties. Storm Water Easement and Maintenance Agreement Page 2 of 18 Section 3, MAINTENANCE The PROPERTY OWNER agrees to maintain the storm system in accordance with the ordinances and all applicable codes of the CITY and the Storm Water Pollution Prevention Maintenance and Operation Schedule attached as Exhibit "C" and incorporated herein by this reference. The PROPERTY OWNER does hereby agree that the CITY may enter onto the property of the PROPERTY OWNER via the easement described above to inspect and perform necessary maintenance if, after the PROPERTY OWNER is given notice to maintain, the PROPERTY OWNER fails to maintain. Further, the PROPERTY OWNER agrees the CITY may enter onto the property of PROPERTY OWNER via the easement described above to perform emergency maintenance in the event of the storm system's failure which might result in adverse impacts(s) on public facilities or private facilities of other property owners. In both events the PROPERTY OWNER agrees to reimburse the CITY for the costs incurred by the CITY in maintaining the stone system. Should the CITY incur attorney's fees and/or costs in enforcing the agreement and/or in maintaining or collecting maintenance fees, the PROPERTY OWNER agrees to pay reasonable attorney's fees and all costs incurred by the CITY. Section 4, ACKNOWLEDGMENT OF OTHER ENFORCEMENT ACTIONS PROPERTY OWNER acknowledges that there may be liability for violations of codes that could result in additional fines and/or the possibility of incarceration in addition to the fees for maintenance should violations occur. Storm Water Easement and Maintenance Agreement Page 3 of 18 EXECUTED as of the date first written above. Au~nzed Signature ~1 / Date ;IYiy~--•- `-~X Aut zed Signature Date STATE OF WASHINGTON) ss COUNTY OF KING ) I certify I have know or have satisfactory evidence that .j ( A CLX L LJec l is/are the person(s) who appeared before me, and said p ons)_acknowedged that he/she7tFicystgn~this-instrument on oath stated that he/she/they wasTwere authorized to execute the instrument and acknowledge as the of Cox and Woodward LLC, a limited liability company, to be the free and voluntary act of such party for the uses and purposes mentioned in the instrument. Dated ~ / i I hp RI L. ;~~r1381pN~ ~ 'j 00?4 ~9.t~ ~g3MIN '0 Notary Public in and for the Residing at My appointment expires- of W Storm Water Easement and Maintenance Agreement Page 4 of 18 CITY OF AUBURN -G(~- y/z Z'/C' v Tim Carlaw, Storm Drainage Engineer/ Date STATE OF WASHINGTON) )ss. COUNTY OF KING ) I certify that I know or have satisfactory evidence that Tim Carlaw is the person who appeared before me, and said person acknowledged that he signed this instrument, on oath stated that he was authorized to execute the instrument and acknowledged it as the STORM DRAINAGE ENGINEER of THE CITY OF AUBURN to be the free and voluntary act of such party for the uses and purposes mentioned in this instrument. Dated 71aa/ cs, F RI ! 61 it ~JutA O ..,1Md83igy 'IA -y y -0 ' : m % Notary Pubs' n and for the State Was ington m 's'ue ~hw °c = Residing ate r~Co (A)L'-'L( fit 0~ My appointment expires 0 ` '/t1,gSH`NG ~z ~ HS/tlb File: # 1211 REF. H:\Development\Projects\Cox & Woodward Short Plat\FAC08-0010 Cox & Woodward\Legal Does Storm Water Easement and Maintenance Agreement Page 5 of 18 EXHIBIT "A" STORM WATER EASEMENT AUBURN SHORT PLAT NO. SPlA6-0006, AS RECORDED UNDER RECORDING NO. 20070517900005, RECORDS OF KING COUNTY, WASHINGTON. SITUATE IN THE CITY OF AUBURN, COUNTY OF KING, STATE OF WASHINGTON. STORM WATER EASEMENT 'raj. No.: Date: Design: .24- RJF HEDGES Engineeringg & Consulting, Inc. 913 Klncald Avenue, Sumner, WA 98390 Storm Water Easement and Maintenance Agreement Page 6 of 18 EXHIBIT "B" N.T.S. LINE TABLE LENGTH REARING aaa~ Nes3rvro 1A91 HBT08RYV CURVE TABLE ERGTH RADIUS DELTA a "JAy X71 zaa reAMP STORM WATER EASEMENT Dote: Deeign: 9/19/OS RJF .4 Engine DG ES tiumne c WA 98390 Storm Water Easement and Maintenance Agreement Page 7 of 1S 3rd Street SE EXHIBIT `C' HEDGES Engineering & Consulting, Inc. 913 Kincaid Avenue, Sumner, Washington 98390 STORMWATER POLLUTION PREVENTION PLAN FOR THE COX & WOODWARD SHORT PLAT PERMIT #FAC08-0010 August d, 2008 Project Site Information: The project is located in the NEY< of the SEf< of Section '18; Township 21 North, Range 5 East, W.h1., at 1310 through 1316 3r° Street SE, Auburn, WA 98002. Parcel Numbers: 2149800275,2149800276,2149800277,2149800278 Proponent/Owner: Woodward & Cox, LLC. 37226 33"1 Avenue South Auburn, WA 98001 Phone: (253) 208-9653 Prepared By: Jeremy W. Metzler, E.I.T. Reviewed By: David T. Hedges, P.E. Hedges Engineering & Consulting, Inc. 913 Kincaid Avenue Sumner, WA 98390 Phone: (253) 891-9365 Storm Water Easement and Maintenance Agreement Page 8 of 18 Introduction EXHIBIT `C' The Cox & Woodward Short Plat project consists of four new two-family residences (duplexes) on Auburn Short Plat SPL06-0006, recorded under King County AFN 20070517900005. This Stormwater Pollution Prevention Plan has been prepared to address the City of Auburn's site development and storm drainage requirements for this project. The project site is located on the south side of 3"' Street SE, between N Street SE and 0 Street SE. Prior to development, the site was vacant with open lawn space and few trees. Storm water was contained on-site due to naturally well-drained soil conditions, providing groundwater recharge. On-site explorations have uncovered fine loamy sands, and coarser sands and gravel at depths below seven feet. Historically, this area may have been located in the channel of the Green River, which is currently east and north of the site. The total site area is 42,535 square feet (0.976 acres), of which about 23,130 square feet (0.531 acres) of the site is impervious, consisting of the site access improvements, proposed duplex buildings, concrete patios and driveway surfaces. The roofs and driveway surfaces will drain to individual infiltration systems. All remaining surfaces (site access, lawns) will drain toward a shared infiltration bed. located on the boundary between Lots 1 and 2. Said infiltration bed is 2'-4" deep.. 54 feet long, and 20 feet wide, containing two rows of StormTechO SC-310 Chambers wrapped in filter fabric (a.k.a. Isolator" Rows). Plan Goal The goal of this Stormwater Pollution Prevention Plan is to prevent adverse environmental impacts to the City's groundwater supply. This shall be accomplished by the prevention of unnecessary and hazardous spills, and through the treatment of stor€ilwater runoff prior to infiltration. Attached to this narrative is a maintenance manual, which offers guidelines to the owner for storm water facility maintenance In the rare event that runoff were to overflow the proposed infiltration bed, flows would travel directly from the proposed inlet (SDCB 41) across City sidewalk, down the proposed driveway approach, onto 3r' Street SE, down the existing asphalt wedge gutter, and into a City catch basin only 130 feet east. No adverse downstream impacts are expected, as runoff should be contained in right-of-way. Prevention BMPs During construction activities, every effort shall be made to prevent any accidental spills of pollutants. Catch basin protection shall be provided for existing drainage structures and proposed ones as they are constructed. Sediments and pollutants shall not be permitted to leave the project site. The contractor shall provide a Spill Response Plan for the City's review and approval- For suggested BMPs, please refer to the current edition of the Department of Ecology's Stormwater Management Manual for Western Washington, Volume IV_ The likelihood of hazardous spills occurring on a residential project after construction is complete is very low. In the event of a spill, floatables and oils shall be trapped in the primary catch basin located near the northwest comer of Lot 'l. This catch basin shall contain a water quality control structure according to the City of Auburn standard detail STORM-03. Pi?DQ7.24fw00DNlARD & COX TOPORDesigwStom iiSWPPF doc Page 2 Storm Water Easement and Maintenance Agreement Page 9 of 18 EXHIBIT `C' Finally, the proposed catch basin shall have "DUMP NO WASTE - DRAINS TO GROUNDWATER" stenciled on and/or adjacent to the grate. The owner shall be responsible for sweeping and cleaning the lot as needed, installing storm drainage stenciling, and providing spill control measures after construction. In case of a spill, call the Department of Ecology (DOE) at (425) 649-7000. The catch basin, access manholes, and StormTeche Chambers will be visually inspected for accumulation of debris and silt, and will be maintained as required by this pollution prevention plan and attachments. • No. 4 - Control Structure I Flow Restrictor • No. 5 - Catch Basins • StormTech(D IsolatorTh4 Row Operations and Maintenance Manual Treatment BMPs The combination of water quality control structure and the StormTechM- isolatorT10 Rows will treat and clean site runoff prior to infiltration. A water quality control structure will be installed on the outlet from SDCB 41 to trap oils and other floatables, including most sediment, at the point of entry. The Isolatorm Rows will trap remaining sediment and Total Suspended Solids (TSS) prior to reaching the infiltration stone bed. An IsolatorT Row is a row of standard StormTech(~) Chambers wrapped in a pair of filter fabric strips. These strips of fabric at similarly to a silt fence, capturing and detaining most Suspended solids while allowing water to pass through at a reasonable rate. Given the calculated IsolatorThl Row hydraulic loading rate of 0.586 gpm per square foot of chamber area, and testing results provided by the manufacturer, the system should experience better than 99% Total Suspended Solids (TSS) removal. This is over '19% better than required by the Auburn Design Standard 6.05.7.1 C. The City of Auburn Storm Drainage Utility section is to review and approve any changes to this Storm Water Pollution Prevention Plan prior to changes in its implementation. Additionally, any changes in ownership or person of responsibility are to be reported to the City of Auburn Storm Drainage Utility section. Inspection To ensure proper operation of the stormwater facilities, inspections of the stormwater facilities must occur at least twice annually (spring and fall)- Records of inspection and maintenance will be kept for five (5) years by the owners and will be available for City inspector review. An Inspection and Maintenance Review Checklist is included. Maintenance Routine maintenance of the site will include mowing, care of landscaping, and the removal of trash and debris from the drainage system- The access road and driveways should be kept clean and in repair. Events such as major storms or heavy winds will require immediate inspections for damages. Be careful to avoid introducing landscape fertilizer to groundwater. To ensure proper water quality and treatment, the StormTechS infiltration system must be properly maintained. Catch basins and manholes shall be cleaned when the sump is 113 full of sediment and debris Maintenance of the StormTechc- chambers can be performed entirely from the proposed access, with almost no impact to residents- Two Type 1 catch basins serve as inlet structures to the StormTechT) IsolatorTm Rows, which will be located P QG47.24(WOOD'WARD & COX TOPO)0esign;StomilSWPFP hoc Page 3 Storm Water Easement and Maintenance Agreement Page 10 of 18 EXHIBIT `C' immediately adjacent to the access. lsolatori°" Row sediment levels can be seen in one of these structures, or by one of two inspection ports (one located at the east end of each row)- A Vector truck parked in front of the inlet structures can perform maintenance without blocking access to the residences or disturbing back yard areas. Please refer to the IsolatorTM Row O&M Manual. attached- Proponent/Owner. Woodward & Cox, LLC. 37226 33rd Avenue South Auburn, WA 98001 Phone: (253) 208-9653 Design Engineer: David T. Hedges; P.E. Hedges Engineering & Consulting, Inc. 913 Kincaid Avenue Sumner, WA 98390 Phone: (253) 891-9365 Plan and/or Information Updates: The City of Auburn Storm Drainage Utility section is to review and approve any changes to this Storm Water Pollution Prevention Plan prior to changes in its implementation. Additionally, any changes in ownership or person of responsibility are to be reported to the City of Auburn Storm Drainage Utility section- P 1200724(A'OOD'dVARD & COX T0PO)0esign%S~omi%&0JPPP,doc Page J Storm Water Easement and Maintenance Agreement Page 11 of 18 EXHIBIT `C' INSPECTION AND MAINTENANCE REVIEW CHECKLIST {°d } rt I s r h1f{iIi is i i~' STRUCTURE : N Al : Results ! Date Maintenance Inspection Results Catch Basin Maintenance Done Inspection Results Access Manholes Maintenance Done Inspection Results Conve ance Pi es y p Maintenance Done Inspection Flow Restrietor Results S di t C t l ( e men on ro Maintenance Riser) Done Inspection StormTechO Results Isolator"' Row Maintenance Done P k20C7,24(WOOD'AARD & COX T4P0y\Deslgn%Storm%SWPPP.doc page 5 Storm Water Easement and Maintenance Agreement Page 12 of 18 EXHIBIT `C' No. 4 - Control Structure/Flow Restrictor Maintenance Defect Condition When Maintenance is Results Expected When Component Needed Maintenance is Performed General Trash and Debris Material exceeds 25% of sump Control structure orifice is (includes Sediment) depth or I foot below orifice plate. not blocked. AEI trash and debris removed. Structural Damage Structure is not securely attached Structure securely to manhole wail. attached to wall and outlet pipe. Structure is not in upright position Structure in correct (allow up to 10% from plumb)_ position. Connections to outlet pipe are not Connections to outlet pipe watertight and show signs of rust are watertight, structure repaired or replaced and works as designed. Any holes, other than designed Structure has no holes holes, in the structure. other than designed holes. Cleanout Gate Damaged or Missing Cleanout gate is not watertight or Gate is watertight and is missing. works as designed. One maintenance person cannot Gate moves up and down move up and down gate. easily and is watertight. Chaintrod leading to gate is Chain is in place and missing or damaged. works as designed. Gate is rusted over 50% of its Gate is repaired or surface area. replaced to meet design standards. Orifice Plate Damaged or f0issing Control device is not working Plate is in place and properly due to missing, out of works as designed. place, or bent orifice plate. Obstructions Any trash, debris, sediment, or Plate is free of all vegetation blocking the plate. obstructions and works as designed. Overflow Pipe Obstructions Any trash or debris blocking (or Pipe is free of all having the potential of blocking) obstructions and works as the overflow pipe. designed. Manhole See "Closed See "Closed Detention Systems" See "Closed Detention Detention Systems"' (No. 3). Systems" (No. 3). (No. 3). Catch Basin See "Catch Basins" See "Catch Basins" (No. 5). See "Catch Basins" (NO. (No. 5). I 5). P L007.24('VYCODWARD & COX TOPO)0esigmSiorm4SV4PPP.doc Page 6 Storm Water Easement and Maintenance Agreement Page 13 of 18 EXHIBIT'C' No. 5 - Catch Basins Maintenance Defect Conditions Men Maintenance is : Results Expected wheit Compoffettt Needed Maintenance is performed General Trash & Trash or debris which is located No Trash or debris located Debris immediately in front of the catch basin immediately in front of opening or is blocking inletting capacity of catch basin or on grate the basin by more than 10%. opening. Trash or debris (in the basin) that exceeds No trash or debris in the 60 percent of the sump depth as catch basin. measured from the bottom of basin to invert of the lowest pipe Into or out of the basin, but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe. Trash or debris in any inlet or outlet pipe Inlet and outlet pipes free blocking more than 119 of its height. of trash or debris. Dead animals or vegetation that could No dead animals or generate odors that could cause vegetation present within complaints or dangerous gases (e.g., the catch basin. methane)- Sediment Sediment (in the basin) that exceeds 60 No sediment in the catch percent of the sump depth as measured basin. from the bottom of basin to invert of the lowest pipe into or out of the basin, but. in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe- Structure Top slab has holes larger than 2 square Top slab is free of holes Damage to inches or cracks Weer than 14 inch. and cracks. Frame and/or Top Slab (Intent is to make sure no material is running into basin). Frame not sitting flush on top slab, i.e., Frame is sitting flush on separations of more than 3/4 inch of the the user rings or top slab frame from the top slab. Frame not and firmly attached. securely attached Fractures or Maintenance person judges that structure Basin replaced or repaired Cracks in is unsound. to design standards.. Basin Walls! Bottom Grout fillet has separated or cracked wider Pipe is regrouted and than 112 inch and longer than t root at the secure at basin wall. joint of any inletfoutiet pipe or any evidence. of soil particles entering catch basin through cracks. Settlement' If failure of basin has created a safety, Basin replaced or repaired Misalignment function, or design problem. to design standards. Vegetation Vegetation growing across and blacking No vegetation blocking more than 10% of the basin opening. opening to basin. P: 12007.24('a4'OODWARD & COX TOPO)iDesignlStomi,,S'.tiPPP.;•oe Page 7 Storm Water Easement and Maintenance Agreement Page 14 of 18 EXHIBIT `C' No. 5 - Catch Basins Maintenance Defect Conditions When Maintenance is Results Expected When ' Component Needed Maintenance is performed Vegetation growing in inlet/outlet pipe No vegetation or root joints that is more than six inches tall and growth present. less than six inches apart. Contamination See "Detention Ponds" (No. 1)- No pollution present. and Pollution Catch Basin Cover Not in Cover is missing or only partially in place. Catch basin cover is Cover Place Any open catch basin requires closed. maintenance. Locking Mechanism cannot be opened by one Mechanism opens with Mechanism maintenance person with proper tools. proper tools. Not Working Bolts into frame have less than 112 inch of thread. Cover Difficult One maintenance person cannot remove One maintenance person to Remove lid after applying normal lifting pressure. can remove cover. (Intent is keep cover from sealing off access to maintenance.) Ladder Ladder Rungs Ladder is unsafe due to missing rungs, Ladder meets design Unsafe not secu" attached to basin wall, standards and allows misalignment, rust, cracks, or sharp maintenance person safe edges. access. Metal Grates Grate opening Grate with opening wider than 7;8 inch. Grate opening meets (If Applicable) Unsafe design standards. Trash and Trash and debris that is blocking more Grate free of trash and Debris than 200/ of grate surface inketting debri& capacity- . Damaged or Grate missing or broken member(s) of the Grate is in place and Missing. grate. meets design standards. P",2007.24('OVC ODWARD 8 COX TOPO)\DesignlStomiiS'APPP.doc Page 8 Storm Water Easement and Maintenance Agreement Page 15 of 18 :+amnmrrhww..w~ EXHIBIT tray lsolatW Row 0&M Manual StormTech' Chamber System for Stormwater Mariiagement LO The Iso.latee Raw 1.1 MTA0DlTCT N An ty"ar4 component of any Stormwater Pol6nton Preveralon Man Is Inspection and maintenance. The StormTech isolator Raw is a patent panting technique to Irtetrpansfvely enilwco Total Suspended Solids (TSS) rengval and provide easy access for Inspection and maintenance. 1.2 THE OWT1>Tt" RI V The Isolator Row is a row of StorniTech chambers. 6fhar SG740 a 50370 models. that Is surroumead with firer fabric and connected to a closely located marthote for easy accost. The fabric-wrapped CINOITO rs provhle rot setting and Motion ad socilment as storm water rises In the Isolator Row and ultimately passes through Vie Filter fabric, Theopen bOUbta chambaCS and pedOraWd sib waft aliwr storm "a to pew bah vorllcafy and horizon- rally out at the chambers. Sediments are capaxed In the isolator Row protecting the storage oreos of be Ole- cent stone and Chambers from sediment atxwmulatlOrl The Isolator Row is typlt:01 desVied to cglture the 'first Gash' and offers Me versatility to be Sized on a Va were basis or Dow rate basis. An upstream manhole not only provides access to the Isolator Row but typically Includes a high flow weir such that 5101m water W wales or voumes that eta:eed the capacity of the Isolator Row overtop the over flow weir and discharge through a mambld to the other charibert, The Isolates Row may also be, past of a treatment train. 9y treating storm water prior to entry into the chamber system, the suite life can be eMerulad and pollutants SUCK at hydrocarhats can be Captured. Pwitteatment best meo"ntent practices can be as simple as deep sump catch basics, oil-water separators or can be inno- vativis storm water treatment devlte4. The design Or the treatment trait and selection of pretreatment devices by the design eVneer is often driven by regulatory tecldraments. Whether pretreatment its used Or TIM the WafOr Row Is recommended by StormToch as an effective means to mlNmIze malrftenerice nxii ilremetis and mairitimance costs. Note: See the StOrM760 DDstgn Afatrzrai for desired hvnneanon on deslip" WKS for a SIO(mTech system. bacadd8da the rsolsox Row Storm Water Easement and Maintenance Agreement Page 16 of 18 taokkg loan Yr lwJsAor&mr inter Ma ateaparritgs rtoaat gaoarbdr7r h 5lrodrtbetaioat ~ dialMar and staraDaar, StormTech Isolator Row with Overflew Spillway lnoi to state) EJCHIBIT 'G' 2.0 Isolator Row InVection/Maintenance 2.9 111IMMtON The ffegt my of inspection and Maintenance varies by location. A routtm inspection schedule creeds to be astablishad for each Ittlddusal location based goon she sped variables. The type of"use (I.e. kidustria4 commercial resllatkiaq. anticipated p0anant load. per- cent imparvlousrness, cdmate, etc. all play a critical role it cietermkdng the actual traciuancy of Inspection and mahnwarics praWces. At a minimum. StormTech recomMands annual Inspec- tloM IrdtIn9yl rho Isolator Row ShOVId be Inspected every 6 rrloMhs for Me" year of operation. for subsequent years, the Inspection should be adjusted based goon prevtots observation of sodimeM deposition, The Isolator Row Incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed}, The inspection pats allow for easy access to the system from the surface, Marinating the need to perram a Confined specs entry Fa Inspection purposes. It upon visual inspection t Is found that Sediment has acatrruaated. a stele rod should be Inserted to deter- mine the depth of sediment. When the average depth of sedlm0is a fCeeds 3 Inches thrOughout the length of the isolator Rowe, caeart-o t should be performact U ATMTUOM The Isolator Row was designed to reduce the cost of perlodic maintenance. By -Isolafl g- sediments tojust one row, costs are dramatically reduced by ellninrxing the need to clean out each row of the entire storage bed. if inspection indicates the potential need for main. tenance. access is provided ft a r shoe(s) located on the end(s) of the row for cleanout. V entry Into the manhole is required please follow local and OSHA rules for a confined space emrles. Storm Water Easement and Maintenance Agreement Page 17 of 18 Eramp/es0lrvhattie3nirtgr1071ki to isOlOlwRow makrenanca. (Mm art rrasfamladi patios.) Maintenance Is accomplished with it* Jelvac process, The Jetdac process utilizes a high pressure water noz- zle to prod Itself down the Isdata Row while scouring and suspending sediments. As the nozzle Is retrieved, the captured pulltards are f ushedl back Into the man- hole fa vactnrr4ng. Vlost sewer and pipe maintenance companies have vacuumlioNac combination vehicles. Selection of an approprlaw JaVac nozzle will Improve maiiintenar" eldcierey. fi%ed nozzles designed for cul- verts or large diameter pipe cleaning are preferable, Rear fat4 jets With an effactlre Weed of at least 45' are hest- Most MVac reels have 400 feet of hose allow- Itg maintenance Wan Mister Row Lit 10 50 chambers long. The JetWc process shall only be parlotmed on StormTtth Iwistor Rawl that have AASHTO class i woven peotsrtps (as spst(fiad by swmiech) over their antputar base atone. StormToch ieotator Row (not rot scale) EXHIBIT'C' 3.0 Isolator Raw Step By Step Maintenance Procedures $1" 1) inspect Isolator Row for sediment Storm7eeh leoNtor Row {nor to scale) A) Inspection pats (If pxesera) 1. Remove Ild krnn MCI box frame L Remove cap from inspection riser 11. litho) a gaslillgla and stadia rod, measure depth of sediment and record results on molrnenance log. tv. It sediment is aL or above, 3 inch depth Focead to Step 2, it not proceed to step 3. B) An Isolator Rows I. Remove cover from manhole at upstream end d isolator Row 11. Uskg a AashlIght. Inspact down tsotator Row troth otW pipe t. Ultras on pr>Ls a comers may be usod to avoid a connnea space entry 2. Follow OSHA regulations for coniklad space entry C entering manhote 11. If sediment Is at or ahwe the lower row of sidewall holes (appIcWmately 3 inches) proceed to Step 2, It not proceed to Step 3. Stop 2) Clean our Isolator Row using the JKVac process A) A fixed culvert cleaning nozzle with teat facN nozzle spread of 45 Inches or more Is preferable B) Apply multiple passes of JetVac undl backfhrsh water is clean C) Vacuum manhole surf as required Step 3) Replace all caps, I83s and covers, tecoru observations and actions Step 4) Inspect & clean catch basins and manholes upstream of the S=mTech system Sampte MaIntonsatre Log tormTech® yAr *n-As7d0•Badrarpa Subsurface Stormwater Management" 2POarr Poad.SUih104 W t MWd [Con alt, 06101 ROW1188 j .8s2.M I t% 866328001 ( vawtstam+rrhr 5numTethpxaduttsera cm+bral ty tw amore of 8ne.b p818nLC: !t5 Pests; S.aOl.46v:5,51 f.9D3:5, P76163 5.518.7)& 5,8as,8aa; Pan vos:2.158Af8 OUser U.S, and Foreign Pahats PmdngPo'rrtad in USA oCoprfigx.All dgmnsarved.Swor10 +LtC,2to4 SO 104.1 Storm Water Easement and Maintenance Agreement Page 18 of 18