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HomeMy WebLinkAbout20080514002189 STORM WATER EASEMENT AND MAINTENANCE AGREEMENT 0Iq,1/1' Return Address: City of Auburn City Clerk 25 West Main Auburn, WA 98001 43!3.2- 20080514002189 PACIFIC NW TIT EAS 111.00 EXCISE 'TAX NOT RE00RED 05Gia01 OF 1382s King CO. ROCO~rd5Itision KING COUNTY, WA 1J By Deputy 1 y a~ ls' . Above this line reserved for recording information. STORM WATER EASEMENT AND MAINTENANCE AGREEMENT GRA08-0002 Reference # (if applicable): N/A Grantor/Borrower: Mr. Chuck Klein Grantee/Assignee/Beneficiary: City of Auburn Legal Description/STR: SE V4 S19 - T21 N - R5E Assessor's Tax Parcel ID#: 192105-9249 THIS EASEMENT AND AGREEMENT made and entered into this c~l day of Q 2008, by and between the City of Auburn, a municipal corporation of King County, Washington, hereinafter referred to as "CITY" and Mr. Chuck Klein hereinafter referred to as "PROPERTY OWNER". WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY for the construction of facilities for Auburn's Auto Pointe located at 1344 17"' 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 S-id documerd(s) were filed for rawrd by Pacific Nmlhwest TMe m Storm Wa ter Easement and Maintenance vrL~nt 3)KBriYrlid as to pfd Y~ta0tlMr)n or Pagel of rd ;o . ` _ b King Co. Records Division as to ks affect aW title. DY DpputY 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 fianctioning 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. GRA08-0002, 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. 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. Storm Water Easement and Maintenance Agreement Page 2 of 14 In both events the PROPERTY OWNER agrees to reimburse the CITY for the costs incurred by the CITY in maintaining the storm 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. EXECUTED as of the date first written above. CITY OF AUBURN tm Carlaw, Storm Drainage Engineer ate 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 ~ 9 /0 11Attttt~tt , s.N '9A 7~ a m lop tI 1 wA SN\tsC Resi 41~ O~ N /I 116Z, yc"ev My appot4lit~ext~~~pires Mate of Washington Storm Water Easement and Maintenance Agreement. Page 3 of 14 QZ "P,. z~,, 41• A ei. es- Owner Date Owner Date STATE OF WASHINGTON) ) ss COUNTY OF KING ) I certify that I know or have satisfactory evid TO that C,h~z►vs t . and OR.i•n J . .e t N is/are the person, who appeared before , and said individu 1 s) acknowledged that he/she/t_heY signed this instrument and acknowledged it to bes/her/their free and voluntary act for the uses and purposes mentioned in this instrument. Dated (`p 1 L. Bq4 ~~~i ~~\1\h\\1111 Notary Public and for the State o as , on / r N s Residing at ~ '10 ~ u-N 1-- y ' y~'>>dL~ F _ a = My appointment expires 1 IT f q lab ! ( T /1 '1111P WASN`N HS/tlb File: #1192 REF. H:\Development\Projects\Auburn's Auto Pointe Addition\Legal Documents\2005 Storm Water Easement and Maintenance Agreement Page 4 of 14 EXHIBIT A LEGAL DESCRIPTION: J..ot "A" of the City of Auburn Lot Line Adjustment recorded under ALT-LLA 0004-87, Auditor's File No. 8703 06 4 1 7, Less portion for road per Recording No. 20010123002407, records of King County, Washington. PARCEL NUMBER: 192105-9249 27460 FIVIRER Y- V Storm Water Easement and Maintenance Agreement Page 5 of* 14 EXHIBIT B 17TH STREET S.E. X, EXIST. ' ELEC. x - 44,G~H EXIST. ~ ~ BLDG. 15&a N 09'3$'35' E SITE EXHIBIT l'-a' Storm Water Easement and Maintenance Agreement Page 6 of 14 EXHIBIT C Date: November 15, 2007 Prepared for: .Mr. Chuck Klein Uo Auburn's Auto Pointe 1344 17'h Street S2, Auburn, WA 98002 Prepared by: POE Engineering, Inc. CIVIL & STRUCTURAL ENGINEERING/CONSULTING 1314 8°i Street NF, Suite 20 J. Auburn, Washington 98002 (253) 833-4052 fax (253) 833-40-53 JOB NO. 07.014 Storm Water Easement and Maintenance Agreement Page 7 of 14 I /I 4-/0 *3 STORM WATER POLLUTION PREVENTION MAINTENANCE and OPERATION SCHEDULE for AUBURN'S AUTO POINTE ADDITION GRA NO. 08-0002 Site Address: The project is located in SE'/ of Sectionl9, T21 N, RSE, W.M., at 1344 17tH Street SE. The tax parcel number is 192105-9249. Introduction: This storm water pollution prevention plan has been prepared to address the City of Auburn's site development and storm drainage requirements for the proposed Auburn's Auto Pointe Addition located at 1344 17th Street SE. The site has an area of approximately 1.88 acres and is currently fully developed as an auto sales and service business under C.O.A. FAC0031- 99. The following work is proposed for addition: 1. Fill the existing bioswale and add new parking; 2. Construct a new 3,690 sf service/detail/wash building; 3. eliminate the existing control structure and re-route storm system to the existing infiltration trench via a new AS-3 Aqua-Swirl water quality manhole; 4. re-pave as required to restore surface drainage to catch basins; and 5. route floor drains from the new service/wash bays to the existing oil/water separator. The subject site is currently used as an auto sales/service business including surface retention in the sales lot, a biofiltration swale and a 100' infiltration trench with manholes each end. According to the City of Auburn's Construction Standards for storm water management, the city requires storm water quantity and quality control to all proposed developments. Currently all of the storm water runoff from the landscaped, building and pavement areas is collected in a series of catch basins. This water will be conveyed by existing storm drainage pipe to an existing storm water infiltration trench (North side of property adjacent to 17th Street) via a new Aqua-Swirl AS-3 water quality manhole. The storm water is infiltrated into the ground via the infiltration trench with over flow at the driveway to 17th Street SE. Storm Water Easement and Maintenance Agreement Page 8 of'14 Plan Goal: The specific purpose for the storm water facility is to minimize pollution that is typically associated with modern development. In general, pollution from motor vehicles and pollution generated from erosion. Attached to this narrative is a maintenance manual, which offers guidelines to the owner for storm water facility maintenance. Prevention BMP'S: The catch basins shall have stenciled on them "DUMP NO WASTE - DRAINS TO STREAM." The owner shall be responsible for sweeping the lot, installing storm drainage stenciling and provide spill control procedures. In case of spill call DOE at 1-425-849-7000. The catch basins, Aqua-Swirl manhole, and infiltration trench / manholes shall be visually inspected for accumulation of debris -and silt and will be maintained as required by this pollution prevention plan and attachments. Maintenance Standards for Drainage Facilities (from the Department of Ecology Storm Water Manual, August 2001) No. 5 - Catch Basins Aqua-Swirl System Document - Attached Treatment BMP'S: An Aqua-Swirl AS-3 water quality manhole has been installed to treat runoff for conventional pollutants. The Aqua-Swirl manhole was designed to treat the 100 year post development flows of 1.77 cfs, which is greater than 84% of the 2-year storm event (water quality storm), for water quality treatment. In addition retention is provided (with a 1.20 factor of safety) within the voids in the trench & gravel manhole surrounds along with surface ponding to retain the volume created by the 100-year storm event while infiltrating the 100 year storm developed storm event. Inspection/Maintenance: Storm Water Easement and Maintenance Agreement Page 9 of 14 Regular inspections of the drainage facilities should be carried out twice per year, in the spring and fall. The responsible party should keep records of these inspections available for review by the City. Additional inspections may be required after severe storms. Routine maintenance of the site will include mowing, care of landscaping and the removal of trash and debris from the drainage system. The parking lots and driveways should be kept clean and in repair. Events such as major storms or heavy winds will require immediate inspections for damages. To ensure proper water quality and treatment, the catch basins, Aqua-Swirl manhole, and infiltration trench must be properly maintained. Be careful to avoid introducing landscape fertilizer to receiving waters or groundwater Catch basins shall be cleaned when sump is 1/3' full of sediment or debris. Person of Responsibility: Charles D. & Doria J. Klein c/o Auburn's Auto Pointe 134417 1h Street SE Auburn, WA 98002 Phone: 253-887-0300 Design Engineer: POE Engineering, Inc. 13148 th Street NE Suite 201 Auburn, WA 98002 Phone: 253-833-4052 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 Storm Drainage Utility section. Storm Water Easement and Maintenance Agreement Page 10 of 14 INSPECTION/MAINTENANCE CHECKLIST STRUCTURE "DATE' OF INSPECTION/MAINTENANCE Results/ Maintenance Date Inspection All Catch Basins Results Maintenance Done Aqua-Swirl Manhole Inspection Results Maintenance Done Inspection Conveyance Pipes Results Maintenance Done Storm Water Easement and Maintenance Agreement Page 11 of 14 Maintenance Standards for Drainage Facilities: The facility-specific maintenance standards contained in this section are intended to be conditions for determining if maintenance actions are required as identified through inspection. They are not intended to be measures of the facility's required condition at all times between inspections. In other words, exceeding these conditions at any time between inspections and/or maintenance does not automatically constitute a violation of these standards. However, based upon inspection observations, the inspection and maintenance schedules shall be adjusted to minimize the length of time that a facility is in a condition that requires a maintenance action. Storm Water Easement and Maintenance Agreement Page 12 of 14 No. 5 - Catch Basins Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is performed General Trash & Trash or debris which is located immediately No Trash or debris Debris in front of the catch basin opening or is located immediately in blocking inletting capacity of the basin by front of catch basin or on more than 10%. grate opening. Trash or debris (in the basin) that exceeds 60 No trash or debris in the percent of the sump depth as measured from catch basin. 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 1 /3 of its height. of trash or debris. Dead animals or vegetation that could No dead animals or generate odors that could cause complaints vegetation present within or dangerous gases (e.g., methane). the catch basin. Sediment Sediment (in the basin) that exceeds 60 No sediment in the catch percent of the sump depth as measured from basin. 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 wider than 1/4 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 riser rings or top slab frame from the top slab. Frame not securely and firmly attached. attached Fractures or Maintenance person judges that structure is Basin replaced or Cracks in unsound. repaired to design Basin Walls/ standards. Bottom Grout fillet has separated or cracked wider Pipe is regrouted and than 1/2 inch and longer than 1 foot at the secure at basin wall. joint of any inletioutlet pipe or any evidence of soil particles entering catch basin through cracks. Settlement/ If failure of basin has created a safety, Basin replaced or Misalignment function, or design problem. repaired to design standards. Vegetation Vegetation growing across and blocking No vegetation blocking more than 10% of the basin opening. opening to basin. Storm Water Easement and Maintenance Agreement Page 13 of 14 No. 5 - Catch Basins Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is performed Vegetation growing in inlet/outlet pipe joints No vegetation or root that is more than six inches tall and less than growth present. 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 maintenance. closed. Locking Mechanism cannot be opened by one Mechanism opens with Mechanism maintenance person with proper tools. Bolts proper tools. Not Working into frame have less than 112 inch of thread. . Cover Difficult One maintenance person cannot remove lid One maintenance person to Remove 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, not Ladder meets design Unsafe securely attached to basin wall, standards and allows misalignment, rust, cracks, or sharp edges. maintenance person safe 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 than Grate free of trash and Debris 20% of grate surface inletting capacity. debris. Damaged or Grate missing or broken member(s) of the Grate is in place and Missing. grate. meets design standards. Storm Water Easement and Maintenance Agreement Page 14 of 14 Aqua"irjTM Concentrator Storm water Treatment yStO s The patented Aqua-Swirl ' Concentrator provides a highly effective means for the removal of sediment, floating debris and free-oil. Swirl technology, or vortex. separation, is a , proven form of treatment utilized in the storrnwater industry to accelerate gravies Jonal separation. independent university laboratory performance evaluations have shown the Aqua-swiri, achieves a TSS removal of 91% calculated on a net annual basis. See the "Performance and Testing"Section for.more,details. Each Aqua-Swir1TM is, constructed of High-Density Polyethylene (HDPE), and is therefore modular, lightweight and durable, elimiriating the need for heavy lifting equipment during installation. inspection and maintenance are made easy, with oversized risers that allow for both -examination and cleanout without entering the chamber. System 7-7 Operation Tike Aqua Swirl"" Concentrator Conveyance Flow Diversion System provides full treatment of the "first flush," while the peak design storm is diverted and channeled through the main conveyance pipe. Many regulatory agencies are establishing 'water quality treatment flow rates' for their areas based on' the initial movement of pollutants into the stcrm drainage system. The operation begins when stormwater enters the Aqua-Swiffm by means of its tangential inlet pipe, which induces a.circular (or vortex) flow pattern. Because irl" Sizing Chan Aqua-Swirl"" model Swirl Inner Diameter {ft<} Conveyance Pipe Diameterx Vin. Water Quality Treatment ~ Fiowz (Cfs) Off/Debris Storage Capacity Sediment Storage Capacity AS-2 .2.5 12 1.1 37 ~ 10 AS-3 3.25 10 f I6 t.8 I 110 20 AS-4 4.25 i 12 :8 3.2 190 32 AS-5 5.0 :10 24 4.~ ~ 270 ~ &5. AS-6 6.0 30 6.3 390 65 AS-7 7.0 24 .3 8.6 5r_- u 90 AS-8 8.0 26 42 ~ I 1.1.2 710 I 5 AS-9 9.0 I 23 i 8 1-4.2 I 910 145 AS-10 - 10.0 30 54 + 1-7.S ~ 1130 i V V AS-12 12iO j 30 60 ~ 25.2 ~ 1698 270 1) As recommended by the Censer for Watershed Protection and most mw7icipalities, the Acjua-Swirf,'*1 provides "cull treatment of the "First flush, " while the peak design storm is diverted and channeled through the main conveyance pipe. Prices are based on typical pipe diameters, larger pipe diameters ara available at an additional cost, please refer to your local r e,oresentative for more information. 2). Many regulatory agencies are establishing "water quality treatment flow rates" for their areas based on the initial movement of pollutants into the storm drainage system. The Treatment flow rate of the Aqua-Swirl system is engineered to meet or exceed .the local water quality treatment criteria. This "water quality treatment flour rate" typically represents approxir„stely,9ol to 95% of the total annual runoff volume. The design and orientation of the Aqua-Swir1Tl Concentrator generally entails -sortie degree of customization. For assistance in design and specific sizing using historical rainfall data, please refer to an AquaShieidTm representative or go to our web site for more information to locate your representative. at wmw.AquaSNeldlnc.com. CAD details and specifications are available upon request. STANDARD NOTE: 1. System.shall Ue designed for the folio-AV capackles: Peak Treatment flaw: 6.3 rss Sediment Storage: GS Ica oiyDebd!; Storage: 390 gal. r Please see acaainpanied'Acgna-SMA spccificatinn notes. k See Site Platt rbr actual system arienLaL•ia -Flam Lomete X14 ~ 104" 6€ 7 r" 1.. Mebask~ DZ4 P kr- rornmLaa"tim Manhole Frame & Cover De'tall Doanlleg* For Ii"20.Trafflc Loading Areas `~II~Id P seal ; 1` IOML NTS mo"a (asa)s . Y (nx3) em iocr h"=)11O ° US.Par A ua--SWirl Concentrator l vuaLr ~ri 310,652!473and0gter Fbtm* P Model AS-"G Shand-ard Detail t-1pe coupling by Contractor. Plan View ~ Cover f~Z" long Slutrpul I ' by Manufadtyrer. 3' ryp gtr rlr ;mmm r+ ~ Manhole Frame and Cover by Manufacturer. (See Details) 3z" Aqua--Swirl Concentrator 1 Model AS-6 Standard Dct Piro elevations to match finished grade. HOPE risers can be field cut by Contractor. 1 Aqua-.Swirl" Specifications 1. GENERAL This specification shall govern the performance, materials and fabrication or the Stormwater T reatment System. IY. SCOPE OF WORK The Aqua-Swir1,1A Concentrator shall be provided by AquaShieldr", Inc. 2733 Kanasn" Drive, Chattanooga, TN (423-870-8888) and shall adhere to the following material and performance specifications at the specified design flows, and storage capacities. lit. MATERIALS A. Storrimwater Treatment System shali be made from high-density polyethylene (HDPE) resins meeting the following requirements: 1) HDPE Matedaf - The HDPE material supplied under this specification shall be high density, high molecular weight as supplied by manufacturer. The HDPE material shall conform to ASTM D3350-98a with minimum cel( classification values or 345464C. Earlier versions of this specification will not be accepted. 2) PHYSICAL PROPERTIES OF HDPE COMPOUND a) Density - the density shall be no less- than 0.955 gms/ccm as referenced in ASTM 1505. b) Melt Index - time melt index shall be no greater than 9.0 gms/10 minutes when tested in accordance with ASTM 1238- Condition 3.2.3, c) Flex Modulus - flexural modulus shall be 110,000 to less than 160,000 psi as referenced in ASTM D 790. d) Tensile Strength at Yield - tensile strength shall be 3,200 to less than 3,500 psi as referenced in ASTM D 638. e) Slow Crack Growth Resistance shall be greater than 100 hours (PENT Test) as referenced in ASTM F x473 or greater than 2000 hours as referenced in ASTM D 1693 (condition C), t) Hydrostatic Design Basis shall be 1,600 psi at 23 degrees • C when tested fn accordance with ASTM D 2837. B. RE]EMION - The Stormwatei T reatxnerrt System may be rejected for failure to meet any of the requirements of this specfrecation., IV. PERPOPNANCE A. The Stormwater Treatment System shall include a '-1-inch inner diameter (ID) circular - hyon5dynarniC • flow-through treatment chamber to treat the incoming water. A tangential inlet shall be provided to induce. a sMriing flow pauem that wits cause sedimentary solids to accumulate in the bottom center of tfle chamber in such a way as to prevent re*.suspension of captured particles. An arched bat 7e wall shall be provided in such a way as to prevent floatable liqu)d oils and solids from exiting the treatment chamber while enhancing the swirling action of the storrnwater. B. The Stormwater Treutrnent System shall heave a, sediment-storage capacity of ?o cubic feet and be capable of capturing _L1 _o gailbns . of petroleum hydrocarbons. The Stormwat;er Treatment System shall have a treatment capacity' a; r,g cubic feet per second (cfs). The Stormwater T reatment Systern shall be capable of ramoving floating trash and debris, floatable oils and 80% of -totzl suspended solids from stormwater entering the treatment chamber. C. Service access to the Stormwater Treatment system shall be provided via 30-inch outer diameter (ID) access riser(s) over the treaunent chamber such that no confined space entry is requtred to perform routine Inspection and maintenance functions. V, TPEA.T MENT CHAMBER C©NSTPLUCi ON A. The treatment chamber shall be constructed from solid wall high- density polyethylene (HDPE) ASTM F 714 cell class 345464 c. For sizes above 63-inch OD, the treatment chamber shall be - constructed from profile wall HDPE ASTM F 894 RSC 250 pipe or solid wall HD'PE. 031104 Aqua-S1'+/W" Corcentratar StorlirwaterTreatme' rit B. The bottom thickness of the treatment chamber will be determined in accordance with AS T M D1759. Calculations must be provided to justify the thickness of the bottom. C. The inlets and outlets shall be extrusion welded on the inside and outside of the structure using accepted welding practice. D. The arched baffle wall shall be constructed from HDPE and shall be extrusion welded to the interior of the treatment chamber using accepted welding methods with connections made at 180 degrees of each end. E. HDPE lifting supports may be provided on the exterior of the Stormwater Treatment System in such a way- as to allow the prevention of undue stress to critical components of the. Stormwater Treatment System during loading, off"-foaling and moving operations. The lifting supports shall be constructed as an. integral part of the treatment chamber and extrusion welded using accepted welding practices. F. Top of the treatment chamber shall be built to the requirements of the drawings: Deep burial applications shall require a reinforced HDPE top. G. Reinforced concrete pads spanning the . treatment chamber will be required with tragic rated frames and covers when- the Stormwater t reatment System is used in traffic areas. A professional engineer shall approve the design of the concrete pad and the calculations must be included in the submittal. H.. The manufacturer upon request can supply anti-flotation/ buoyancy calculations. In addition, typical drawings of the AquaShield Stormwater Treatment System with concrete anti-flotation structures can also be provided. Anti-flotation structure design and approval are ultimately the responsibility, of the specifying engineer. The contractor shall provide the anti-flotation structures. V1. INSTALLAT!O N A. Excavation and Bedding -'The trench and trench bottom shall be constructed in accordance with ASTM D-2321, Section 6, Trench Excavation, and Section 7, Installation. The HDPE Stormwater Treatment System shall be installed: on a stable base consisting of 12 inches of Class I stone materials (angular, crushed stone or rock, crushed gravel; large void content, contains little or no fines) as defined by ASTM D2321, Section 5, Materials, and compacted to 95% proctor density. All required safety precautions for Stormwater Treatment System installation are the responsibility of the Contractor. B. Bac ~EII Requirements- Backfill materials shall be Class I or II stone materials (well graded gravels, gravelly sands; contains little or no fines) as defined by ASTM D2321, Section 5, Materials and compacted to 90% proctor density. Class I materials are preferred, Backfill and bedding materials shall be free of debris. Backfilling shall conform to ASTM 1759, Section 4.2, "Design Assumptions". Backfi€I shall. extend at least 2 feet beyond the edge of the Swirl Concentrator for the full height to sub grade and extend laterally into undisturbed soils. C. Pipe Couplings. Pipe couplings to and from the Stormwater Treatment System shall be Fernco° or Mission'rO type flexible boot with stainless steel tension bands. A metal sheer guard shall be used to protect the flexible boot. VII. DIVISION of RESPONSIBILITY A. Storm water. reatment System Manufacturer - The Manufacturer shall be responsible for delivering the Stormwater Treatment System to the site. The system includes the treatment chamber with debris baffle, inlet and outlet stub-outs, lifting supports, 30- inch ID service access riser(s) to grade with temporary cover, and manhole frame(s) and cover(s). B. Contractor - The Contractor shall be responsible for preparing the site for the system installation including, but not limited - to, temporary shoring, excavation, cutting and removing pipe, new pipe, bedding, and compaction. The Contractor shall be responsible for furnishing. the means to lift the system components off the delivery .trucks. The Contractor shall be- responsible for providing any concrete anti-floatation/anti-creep restraints, anchors, collars, etc. with any straps or connection devices required. The Contractor shall be. responsible for field cutting, if necessary, HDPE service access risers to grade. The Contractor shall. be responsible for sealing the pipe connections to the Stormwater Treatment System, backfilling and furnishing all labor, tools, and materials needed. VIII. SUBMITTALS The Contractor shall be provided with dimensional drawings and, when specified, utilize these drawings as the basis for preparation of shop. drawings showing details for construction and reinforcing. Shop drawings shall be annotated to indicate all materials to be used and all applicable standards for materials, required tests of materials. and design assumptions f ' or structural analysis. Shop drawings shall- be prepared at a scale of not less than '/--.inch per foot. Three (3) hard copies of said shop drawings shall be submitted to the Specifying Engineer r"or review and approval. .IX. (QUALITY CONTROL ?INSPECTION A. Materials - The quality of materials, the process of manufacture, and the finished sections shall be subject to inspection by the Specifying Engineer. Such inspection may be made at the place of manufacture, or on the.work site after delivery, or at both places. The sections shall be subject to rejection at any time if material conditions fail to meet any of the specification requirements, even though sample sections may have been accepted as satisfactory at the place of manufacture. .Sections. rejected after delivery to the site shall be marked for identification and shall be removed from the site at once. All sections, which are damaged beyond repair after delivery will be rejected and, if already installed, shall be repaired to the Specifying Engineer's acceptance level, if permitted, or removed and replaced, entirely at the Contractor's expense. S. Inspection - All sections shall be inspected for general appearance, dimensions, soundness, etc. C. Defects - Structural defects may be repaired, subject to the acceptance of the Specifying Engineer, after demonstration by the manufacturer that strong and permanent repairs will be made. The Specifying Engineer before final acceptance of the components shall carefully inspect repairs. System Maintenance Stormwater treatment structures'. (including manufactured systems, ponds, sWales, etc.) long-term. perormance and e ective protection of receiving waters, depends on consistent implementation of their maintenance plan. Inspection and maintenance functions for AguaShieldT" Stormwater Treatment Systems have been made easy,. allowing for all inspections to be performed from the surface. An AquaShieldTM field representative will be available as needed to assist local maintenance personnel in-the field. Please contact us for a copy of a product-specific Inspection and Maintenance Manual. It is important that a routine inspection and maintenance program be estabiished for each unit based on (1) the volume or load of the contaminants of concern, (2) the frequency of releases or" contaminants at the facility or location, and (3) the nature of the area being drained, In an effort to assure that our systems are being maintained properly, Aqua5hieldT'", Inc. offers a maintenance package to all of our customers. We will contract to perform all maintenance functions, from inspection to cleanout. In addition, we will submit a report detailing all maintenance activities. Inspection All AquaShieldTM products can be inspected from the surface, eliminating the need to enter the systems to determine when cleanout should be aerforrned, in most cases, AquaShieidTM, Inc. recommends that for the first year of operation, quarterly inspection of the Stormwater Treatment Systems-. be performed in order to develop an appropriate schedule of maintenance. Based upon experience from the system's first year in operation, we recommend the inspection schedule be revised to, reflect the site-specific conditions encountered. Typically the inspection schedule for subsequent years is reduced to semi-annual inspection. Aqua-Swirl'" INV-' Maintenance The Aqua=Swirl,"' has been designed to minimize and simplify the inspection and maintenance process. The system can be inspected and maintained completely from the surface, thereby eliminating the need for confined space entry. Fu rthermore, the entire structure (specifically, the floor) is accessible far visual inspection from the surface. There are no areas of the structure that are blocked from visual inspection or periodic cleaning.. Inspection of any free-; ioating oil and Voatable debris can be directly observed and maintained through the manhole access provided directly over the swirl chamber. Aqua-SwirfTM Inspection Procedure To inspect the Aqua-Swirly', a hoof: is needed to remove the manhole cover. AauaShielcFm' provides a customized manhole cover with our logo to male it easy for maintenance crews to locate the system in the field. We also provide a permanent metal information plate attached inside the access riser, which provides our contact information, the Aqua-SwiriT"' model size, and serial number. The only tools required to inspect the Aqua-Swirly"' system are a flashlight and a .measuring, device (i.e. stadia rod) or pole. Because of the tremendous access provided, floating oil and debris can be observed directly from the surface. Sediment depths can easily be determined by lowering a measuring device-to the top of the sediment pile and to the water's surface. Whei h the sediment pile is within 30" to 36" of the water surface the system should be maintained. It should be noted that in order to avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. The finer sediment at the top of the pile, typically offers less- resistance to the measuring device than the larger particles. AgUa-Srrir€TM C€eanout Procedure Clean out of the Aqua-Swirl "I is simple. Free-floafi ig ail and floatable debris can be observed and removed direc`Lly through the 30" service access provided. A vacuum truck can be used to rernove the accumulated sediment and debris. It is important to note that . the entire sediment storage area can be reached with a vactor hose from the surface (reaching all the sides). Disposal of the material is typically treated in the same fashion as catch basin cleanouts. AgnShieidTm recommends that all materials removed be handled and disposed of in accordance with focal and state requirements. An "Inspection and Maintenance Manual" is provided irtith each Aqua-Swfrl7m system for more detailed maintenance procedures. On the following page, you will find sample inspection Data ShARts. qua-S irIT14 Inspection Data Sheet Location; Date Inspector Name Distance tb Sediment (in.) Distance to hater (in.) F6oatable Layer Thickness describe Maintenance Required? (yes/no) Aqua-S'virjTM Maintenance Data Sheet Inspector: Date: Location: Time: INSPECT ION General Site Condition Visible Evidence of Spills/ Releases (oils, grease, fuels, paints, chemicais): Visible Evidence of Heavy Sediment Deposition: Swirl .Concentrator Condition of Swirl Concentrator: Condition of Baffle: Distance to Sediment: Distance to Water: **Note: If sediment is less than 30" to 36" below water surface, sediment should be removed. CONTAMINATION REMOVAL DATA Floating Oil and Debris Approx. Volume: Description: Elapsed Removal i me: Sediment Approx. Volume: Description: Elapsed Removal Time: Other Comments