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HomeMy WebLinkAboutKlein, Chuck Auburn Auto Pointe Return Address: City of Auburn City Clerk 25 West Main Auburn, WA 98001 20080514002189 r 4,t rvtif PACIFIC NW TIT EAS 111.00 ' 1 NOT P1 PAGE001 OF 028 : 05/14/2008 15:29 Roccrds ; KING COUNTY, WA 00. y By Deputy Above this line reserved for recording information. STORM WATER EASEMENT AND MAINTENANCE AGREEMENT GRA08-0002 j"to Reference # (if applicable): N/A Grantor/Borrower: Mr. Chuck Klein Grantee/Assignee/Beneficiary: City of Auburn Legal Description/STR: SE % S 19 - T2 IN - R5E Assessor's Tax Parcel ID#: 192105-9249 THIS EASEMENT AND AGREEMENT made and entered into this c? 9 day of 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 17th 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 Std document(s) were filed for 4600r'd by Pacific Nm#wmst 1-ft ab Storm Water Easement and Maintenance AgR nt 3Xati1lrW as to proper sxs&*m or Page 1 of I4' .' K Z Co. Rowrds 9 b ns affect apart tile. By , Deputy 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. 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 im 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 eADG4 11, p +0 TA., i t V < ?F i «. m No 1 r th tate of Washington "/IWASResi bWq C ? Lnni My appo1gtt*1et*` pires / I X 01 Storm Water Easement and Maintenance Agreement Page 3 of 14 (?a y, A y. o S- Owner Date Owner Date STATE OF WASHINGTON) ) ss COUNTY OF KING ) I ?cceertifythat I know or have satisfactory evid ce that 1. and T09,1 J. -e i N is/are the person, who appeared before niie, and said individu 1(s) acknowledged that he/she/they signed this instrument and acknowledged it to be-T is/her/their free and voluntary act for the uses and purposes mentioned in this instrument. Dated I /0 9' o L. IRA 40 It,, L /,8 k?u Notary Public ' and for the State o?as on Residing at csh Co cA-n? Y- i My appointment expires i / (9 ?a o ?' WA S H\ HS/tlb File: #1192 REF. H:\Development\Projects\Auburn's Auto Pointe AdditionTegal Documents\2008 Storm Water Easement and Maintenance Agreement Page 4 of 14 EXHIBIT A LEGAL DESCRIPTION: J tit " .s fthe Cit} of u urn t Lisp Ad 0 justment rec riled wider 1L _1 [.,A 0()(0-87, Audito."s Fitz Nu. 870306417, Ieys portion fear mad per Re cAndin No- ?1010123 002407, re ccf-ds oaf ing Coua , \'Va511117I'llon. PARCEL NUNIBE 1.15-9249 01?' ?? -z 0 1 r ?yi Storm Water Easement and Maintenance Agreement Page 5 of 14 EXHIBIT B 17TH BEET S.E. *+ 3 EXIST. W z 46.5 Ew FXIST. 15` ° N 04"x' E SITE EXHIBIT r'te' Storm Water Easement and Maintenance Agreement Page 6 of 14 EXHIBIT C Date: November 15, 2007 PrePared for: Mr. Chck.Klein clo, Atiburn's Auti P-ointey 15 1344 17"' Strut S E n ?7Lo ?'+ ,t . Aatnjlit, Wl! glSO I? s!?i F Prepared by: POE Engi- eer ng; _ ncr CIVIL & STRUCTHR,4I. ENGC'NEE.RlNG/C0NS 1,-J'jN 1314 8"' Street NF, Suite2101 Auburn, Washiji ;tool 98002 (253) 833-4052 fax (253) 833-4053 JOB O.07-014 Storm Water Easement and Maintenance Agreement Page 7 of 14 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 Section19, 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. FA00031- 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 1-425-649-7000. 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 64% 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 th 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 inlet/outlet 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 1/2 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 Aqu a- iriTm Concentrator Stormwater Treat, metit Systems The patented Aqua-Swirl M Concentrator provides a highly effective means for the removal of sediment, floating debris and free-oil. Swirl technology, or vortex. separationr is a proven form of treatment utilized in the storrnvvater industry to accelerate gravitational separation. Indepe'ndent university laboratory performance evaluations have shown the Aqua-Swirl-lm achieves a TSS removal of SI% calculated on a net annual basis. See the "Performance and Testing" Section for.more?details. Each Aqua-Swir(T"' is. constructed of High-Density Polyethylene (HDPE), and is therefore modular, lightweight and durable, eliminating the need for heavy lii ring equipment during installation. Inspection and maintenance are made easy, with oversized risers that allow for both -examination and cleanourt without entering the chamber. System W Operation The Aqua Swi,-Fm Concentrator Conveyance Flow Diversion System - provides full treatment of the "f=irst 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 storm drainage system. The operation begins when stormwater enters the Aqua-SwirlThS by means of its tangential inlet piper which induces a .circular (or vortex) flow pattern. Because 40. TM . qua- wi Srzing Chart Swirl C€?nveyance Water Quality Oil /Debris /Debris Sediment: Model Inner Pipe Treatment: Storage Storage Diameter Diameter' oW2 .1 Capacity Capacity (in.) (cis) (gal) iS-2 j 2'S z ma ' R ? 37 8 12 I ` 10 AS-3 f 3.25 I :Lo- I 16 13 ? 110 20 J AS-4 4.25 12 8 3.2 ?90 32 S-5 S-0 22 2-4 270 -5 S-Ca _ 22 3 .3 39 65 ;S-7 7.0 24 I 36 ? 8.6 5? 90 AS-S 8.€3 26 42 I . 7: 115 AS-9 9.0 23 43 :K2 910 145 A -:0 I 10.0 30 11-30 180 -12 1 Z:V I 36 60 25.2 ?.??'f? G6 1) As recommended by the Center for Watershed Protection and most muhicipaliges, the Aqua-Swirl,11, provides full treatment of the "first flush, ° while the peak design storm is Give fed and channeled through the main conveyance pipe. Prices are based on typical pipe diameters, larger pipe diameters are available at an additional cost, please refer to your local representative 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 rats or the ?qua-Swirl '' system is engineered to meet or exceed,the local water quality treatment criteria. This "water duality treatment flow raLe- typically represents approxi,„ ateiy 90% to 95% of the total annual ; uno f volume. The design and orientation of the Aqua-Swirl T"' Concentrator generally entails -some degree of customization. For assistance in design and specinc sizing using historical rainfall data, please refer to an AquaShieldTM representative or go to our web site for more information to locate your representative at w?w.AquaShieldlnc.com. CAD detaiis and specifications are available upon request. STANDARD NOTE. 1. System. shall be designed for the following capacities: Peak Treatment Flow: 6.3 cf Sediment Stmage: 65 fta OiVDcbi Is Storage. 390 gal. k Please see accoittpanicd Aqua-SwhI speciticatinn notes,. " See Site Plan for actual svstem orientation f7(0 (A '.1 IA It S IOW ax II 104" 6E ? . ,.: •.. • :' `". Frame -- ..? . 10" •; . ' ? Concrete r . ? '+ ac ?. !User ?s ? '?'.r• ? r?siw ftxm«?ua«??,la., Manhole Frame & Cover De't'ail 8qua%ie#d ? k'? ° For U-20.Traffic Loadiliq Areas 111111,111 1 Uri m 01, 1 a NTS •Sr• a. ntPerem Aqua--Swirl Concentrator 1 Model AS-G Standard Detail Plan View by Contractor. 12" Long Stub-put cover by M.anufadgrer. 3-ryp. p f j{? ?•?• - ?,m 104" r L Manhole Frame and Dover by Manufacturer. (See Details) - 32° S"ectiolx AA Aqua-Swirl Concentrator 14 Model AS-6 Si:anda.rd Detail Wm elevations to matcli finished grade.. HDPE risers can be Field cut by Contractor. IAqua-S irTM Specifications I. GENERAL This specification shall govern the performance, materials and fabrication of the Storm water Treatment System. II. SCOPE OF ?VORK The Aqua-Swirl-,M Concentrator shall be provided by AquaShieldTM, Inc. 2733 Kanasita Drive, Chattanooga, TN (423-870-8888) and shall adhere to the following material and performance specifications at the specified design flows, and storage capacities. III. MATERIALS A. Stormwater Treatment system shall be made from high-density polyethylene (HDPE) resins meeting the following requirements: 1) HDPE Material - 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 cell classification values of 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 iii ASTM 1505. b) Melt Index - the 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 1473 or greater than 2000 howrs as referenced in ASTM D 1693 (condition Q. f) Hydrostatic Desfgn Basis shall be Ij6QQ psi at 23 degrees C when tested In accordance with 6,STM D 2837. B. REJECTLON - The Storrnwater Treatment System may be rejected for failure to rheet any of the requi, zments.of this spec-156atiort, M PFRPO MANCE A. The Stormwater Treatment System shall include a 2t1---inch inner diameter. (ID) circular , hydrodynamic • flow-through treatment chamber i o treat the incoming water. A tarigeritiai inlet shall be provided to induce a swirling flow pa tern. that will cause sedimentary solids to accumulate in the bottom center of the chamber in such a way as to prevent re-suspension of captured panicles. An arched bai rie wall shall be provided in such a way as to prevent floatable liquid oils and solids from exiting the treatment chamber while enhahcing the swirling action of the stormwater. B. The Stormwater Treatment System shall have a. sediment. storage capacity of 20 cubic feet and be capable of capturing-L10- gallons, of petroleum hydrocarbons. The Storrnwater Treatment System shall have a treatment capacity of ?.S cubic feet per second (cfs). T he Siormwater i reatmerit System shall be capable of removing floating trash and debris, floatable oils and 800/o of total suspended solids from stormwater entering the treatment chamber. C. Service access to the Stormwater Treatment System shall be provided vla 30-4nch outer cliarneter (ID) access riser(s) over the trealtment chamber such that no confined space entry is required to perrorm routine inspection and maintenance functions. V, TF,8A T MEh1T ChAME?ER CONS-1 RUC-i ION A. The treatment chamber shall be constructed from solid wall high- densft polyethylene (HDPE) AS TM p 714 cell class 345464 c. - For sizes above 63-inch OD, the treatment chamber shall be constructed from profile wall HDPE ASTM F 8?4 l2SC 250 pipe or solid wall HDP . OM04 Aqua-Swlrr-x Concentrator Storrnwater Treatment B. -The bottom thickness of the treatment chamber will be determined in accordance with AS T M b1759. 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 wail 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-loading and moving operations. The lifting support- 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 traffic rated frames and covers when- the Stormwater Treatment 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 AquaShleld Stormwater Treatment System with concrete anti-flotation structures can also be provided. Anti-flotatioh structure design and approval are ultimately the responsibility of the specifying engineer. The contractor shall provide the anti-flotation structures. - VI. INSTALLATION 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 Stormwa-ter 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 r?li 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. 1386€fill and bedding materials shall be free of debris. Back llling shall conform to ASTM 1759, Section 4.2, 'Design Assumptions". Backfill shad 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 CouDlinos, - Pipe couplings to and from the Stornii?ater Treatment System shell be Fernco® or MissionT'" type flexible boot with stainless steel tension bands. A m' I sheer guford shall be used to protect the flex€ble boot. VII. DIW'SIGN OF RESPONSIBIUTI ' A. Stormwater Treatment 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, liming 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/a, ?ti-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 Stormvater 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 ail materials to be used and all applicable standards for materials, required tests of materials. and design assumptions for 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 for review and approval IX= QUALITY CONTROL 0FSPECTION 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 aver 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. B. Insaection - All sec`uons 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 .performance and" ei i ective protection of receiving waters, depends on consistent implementation of their maintenance plan. Inspection and maintenance functions for AquaShieldTM 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 established for each unit based on (1) the volume or load of the contaminants of concern, (2) the frequency of releases of 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, AquaShieldT'", Inc. offers a maintenance package to all of our customers. We will contract to perform all maintenance functions, from inspection to cieanout. In addition, we will submit a report detailing all maintenance activities. Inspection All AquaShieldT14 products can be inspected from the surface, eliminating the need. to enter the systems to determine when cleanout should be performed. In most cases, AquaShieldTm. Inc. recommends that for the first year of operation, quarterly inspection of the Storm water 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. ;-. Maintenance The Aqua=SNVIH` 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. Furthermore, the entire structure (specifically, the floor) is accessible for 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-floating oil and roatable debris can be directly observed and maintained through the manhole access provided directly over the swirl chamber. Aq ua-SwIrFm Inspectimn Procedure To inspect the Aqua-Sw rl-, a hook is needed to remove the manhole cover. AquaShieldTM' provides a customized manhole cover with our logo to make 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-Swirl-lm model size, and serial number. The only tools required to inspect the Aqua-Swirl, system are a flashlight and measuring, device (i.e. stadia rod) or pole. Because of tine 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. When the sediment pile is within 30° to 35" 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 care fully 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. Aq'Ua-SVV1rP` Cieanai ut procedure Clean out of the Aqua-Swirl-6', is simple. Free-t'loating oil and floatable debris can be observed and removed directly through the 30" service access provided. A vacuum truck can be used to remove 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). Disposaf of the material is typically treated in the same fashion as catch basin cleanouts. AquaShieldTl'l recommends that all materials r emoved be handled and disposed of in accordance with local.and state requirements. An "Inspection and Maintenance Manual" is provided With each Aqua-Swirl "' system for more detailed maintenance procedures. On the following page, you will find sample inspection Data Sheets. Aqua"S irl TM Inspection Data Sheet Location: Date bs ec €? Name ista Sediment (in.) Distance to Water (in.) Fioatabie Layer Thickness describe Maintenance Peeiuire€i? (yesInd), Aqua-SWNTM " . Maintenance Data Sheet Inspector: Location: Date: . Time: INSPECTION Oenerat Site condition Visible Evidence of Spills/ Releases Coils, grease, fuels, paints, chemicals): Visible Evidence of Heavy Sediment Deposition: Sciri Coreee?ttrator Condition of Smrl Concentrator: Condition of Baffle: Distance to Sediment: Distance to Water: **Note: If sediment is less than 30" to 36" below water surace, sediment should be removed. CONTAMINATION REMOVAL DATA Floating Off and Debris Approx. Volume: Description: Elapsed Removal itme: Sediment Approx. Volume: Description: Elapsed Removal Time: O tier Comments