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Attachment A - Long-Term O&M Plan_2020-05-08                           Isolator®Row O&M Manual StormTech®Chamber System for Stormwater Management Save Valuable Land and Protect Water Resources Detention • Retention • Water Quality A division of 1.1 INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The StormTech Isolator Row is a patented technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy access for inspection and maintenance. 1.2 THE ISOLATOR ROW The Isolator Row is a row of StormTech chambers, either SC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC- 4500 models, that is surrounded with filter fabric and con- nected to a closely located manhole for easy access. The fabric-wrapped chambers pro vide for settling and filtra- tion of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric. The open bottom chambers and perforated sidewalls (SC-310, SC- 310-3 and SC-740 models) allow storm water to flow both vertically and horizon tally out of the chambers. Sediments are cap tured in the Isolator Row protecting the storage areas of the adjacent stone and chambers from sediment accumulation. Two different fabrics are used for the Isolator Row. A woven geotextile fabric is placed between the stone and the Isolator Row chambers. The tough geo textile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non-woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. The non-woven fabric is not required over the DC-780, MC-3500 or MC-4500 models as these chambers do not have perforated side walls. 2 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 1.0 The Isolator®Row The Isolator Row is typically designed to capture the “first flush” and offers the versatility to be sized on a vol- ume basis or flow rate basis. An upstream manhole not only provides access to the Isolator Row but typically includes a high flow weir such that storm water flowrates or volumes that exceed the capacity of the Isolator Row overtop the over flow weir and discharge through a manifold to the other chambers. The Isolator Row may also be part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil-water separators or can be inno- vative storm water treatment devices. The design of the treatment train and selection of pretreatment devices by the design engineer is often driven by regulatory requirements. Whether pretreatment is used or not, the Isolator Row is recommended by StormTech as an effective means to minimize maintenance requirements and maintenance costs. Note: See the StormTech Design Manual for detailed information on designing inlets for a StormTech system, including the Isolator Row. ECCENTRIC HEADER MANHOLE WITH OVERFLOW WEIR STORMTECH ISOLATOR ROW OPTIONAL PRE-TREATMENT OPTIONAL ACCESS STORMTECH CHAMBERS StormTech Isolator Row with Overflow Spillway (not to scale) Looking down the Isolator Row from the manhole opening, woven geotextile is shown between the chamber and stone base. 2.0 Isolator Row Inspection/Maintenance Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3 Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water noz- zle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed back into the man- hole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for cul- verts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45” are best. Most JetVac reels have 400 feet of hose allow- ing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by StormTech) over their angular base stone. 2.1 INSPECTION The frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial, residential), anticipated pollutant load, per- cent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspec- tions. Initially, the Isolator Row should be inspected every 6 months for the first year of operation. For sub sequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to deter- mine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean-out should be performed. 2.2 MAINTENANCE The Isolator Row was designed to reduce the cost of periodic maintenance. By “isolating” sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed. If inspection indicates the potential need for main- tenance, access is provided via a manhole(s) located on the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries. StormTech Isolator Row (not to scale) Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) NOTE:NON-WOVEN FABRIC IS ONLY REQUIRED OVER THE INLET PIPE CONNECTION INTO THE END CAP FOR DC-780, MC-3500 AND MC-4500 CHAMBER MODELS AND IS NOT REQUIRED OVER THE ENTIRE ISOLATOR ROW. Step 1)Inspect Isolator Row for sediment A) Inspection ports (if present) i. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measure depth of sediment and record results on maintenance log. iv. If sediment is at, or above, 3 inch depth proceed to Step 2. If not proceed to step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1.Mirrors on poles or cameras may be used to avoid a confined space entry 2.Follow OSHA regulations for confined space entry if entering manhole iii. If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2. If not proceed to Step 3. Step 2)Clean out Isolator Row using the JetVac process A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole sump as required Step 3) Replace all caps, lids and covers, record observations and actions Step 4)Inspect & clean catch basins and manholes upstream of the StormTech system ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com Advanced Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage Systems. Stormtech®and the Isolator®Row are registered trademarks of StormTech, Inc. Green Building Council Member logo is a registered trademark of the U.S. Green Building Council. © 2013 Advanced Drainage Systems, Inc. SO90809 02/13 3.0 Isolator Row Step By Step Maintenance Procedures 4 21) B)1) A) StormTech Isolator Row (not to scale) Stadia Rod Readings Fixed point Fixed point Sediment Date to chamber to top of Depth Observations/Actions Inspector bottom (1) sediment (2) (1) - (2) 3/15/01 6.3 ft. none New installation. Fixed point is Cl frame at grade djm 9/24/01 6.2 0.1 ft. Some grit felt sm 6/20/03 5.8 0.5 ft. Mucky feel, debris visible in manhole and in rv Isolator row, maintenance due 7/7/03 6.3 ft.0 System jetted and vacuumed djm Sample Maintenance Log 70 Inwood Road, Suite 3 Rocky Hill Connecticut 06067 860.529.8188 888.892.2694 fax 866.328.8401 www.stormtech.com Detention • Retention • Water Quality A division of StormTech SC-740 Chamber Designed to meet the most stringent industry performance standards for superior structural integrity while providing designers with a cost-effective method to save valuable land and protect water resources. The StormTech system is designed primarily to be used under parking lots thus maximizing land usage for commercial and municipal applications. 90.7" (2300 mm) 51.0" (1295 mm) 85.4" (2170 mm) INSTALLED ACCEPTS 4"(100 SCH 40 PIPE FOR OPTIONAL INSPECTION PORT 30.0" (762 mm) 8" (203 mm) 24" (610 mm) DIA. MAX SC-740 End Cap StormTech SC-740 Chamber (not to scale) Nominal Chamber Specifications Size (L x W x H) 85.4" x 51.0" x 30.0" (2170 x 1295 x 762 mm) Chamber Storage 45.9 ft 3 (1.30 m 3) Minimum Installed Storage* 74.9 ft 3 (2.12 m 3) Weight 74.0 lbs (33.6 kg) Shipping 30 chambers/pallet 60 end caps/pallet 12 pallets/truck SC-740 Chamber INCREASE COVER TO 24"(610 MM) FOR UNPAVED INSTALLATI ON WHERE RUTTING FROM VEHICLES MAY OCCUR, 30" (762 mm) SC-740 DEPTH OF STONE TO BE DETERMINED BY DESIGN ENGINEER* 6"(150 mm) MIN. 12" MIN. (305 mm) TYP. 6" (150 mm) MIN. 18" (460 mm) MIN. 96"(2440 mm) MAX. DESIGN ENGINEER IS RESPONSIBLE FORENSURINGTHEREQUIREDBEARINGCAPACITY OF SUBGRADE SOILS* 51" (1295 mm) MIN.6"(150 mm) MIN. PAVEMENT 3/4-2"(19-50 mm)CLEAN,CRUSHED,ANGULAR STONE SC-740 CHAMBER SC-740 END CAPADS601GEOTEXTILEOREQUAL THE INSTALLED CHAMBER SYSTEM SHALL PROVIDE THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOREARTHANDLIVELOADS,WITH CONSIDERATIO N FOR IMPACT AND MULTIPLE VEHICLE PRESENCES.GRANULAR WELL GRADED SOIL/AGGREGATE MIXTURES,<35%FINES. COMPACT IN 6"(150 mm)LIFTS TO 95% STANDARD PROCTOR DENSITY. SEE THE TABLE OF ACCEP TABLE FILL MATERI ALS. CHAMBERS SHALL MEET ASTM F 2922-12 “STANDARD SPECIFICATION FOR POLYETHYLENE (PE) CORRUGATEDWALL STORMWATER COLLECTION CHAMBERS.” THIS CROSS SECTION DETAILS THE REQUIREMENTS NECESSA RY TO SATISFY THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR EARTH AND LIVE LOADS USING STORMTECH CHAMBERS Typical Cross Section Detail (not to scale) MADE IN THE U.S.A. Printed on recycled paperPrinted in U.S.A. © Copyright. All rights reserved. StormTech LLC, 2007 S16-090508 20BeaverRoad,Suite104 Wethersfield Connecticut 06109 860.529.8188 888.892.2694 fax866.328.8401 fax860-529-8040 www.stormtech.com STANDARD LIMITED WARRANTY OF STORMTECH LLC ("STORMTECH"): PRODUCTS (A) This Limited Warranty applies solely to the StormTech chambers and endplates manufactured byStormTechandsoldtotheoriginalpurchaser(the“Purchaser”).Thechambersandendplates are collectively referred to as the “Products.” (B) The structural integrity of the Products, when installed strictly in accordance with StormTech's written installation instructions at the time of installation, are warranted to the Purchaser against defective materials and workmanship for one (1) year from the date of purchase. Should a de- fect appear in the Limited Warranty period, the Purchaser shall provide StormTech with written notice of the alleged defect at StormTech’s corporate headquarters within ten (10) days of the discovery of the defect. The notice shall describe the alleged defect in reasonable detail. StormTech agrees to supply replacements for those Products determined by StormTech to be defective and covered by this Limited Warranty. The supply of replacement products is the sole remedy of the Purchaser for breaches of this Limited Warranty. StormTech’s liability specifically excludes the cost of removal and/or installation of the Products. (C)THIS LIMITED WARRANTY IS EXCLUSIVE. THERE ARE NO OTHER WARRANTIES WITH RESPECT TO THE PRODUCTS, INCLUDING NO IMPLIED WARRANTIES OF MERCHANT-ABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE. (D) This Limited Warranty only applies to the Products when the Products are installed in a single layer. UNDER NO CIRCUMSTANCES, SHALL THE PRODUCTS BE INSTALLED IN A MULTI-LAYER CONFIGURATION. (E) No representative of StormTech has the authority to change this Limited Warranty in any manner or to extend this Limited Warranty. This Limited Warranty does not apply to any person other than to the Purchaser. (F) Under no circumstances shall StormTech be liable to the Purchaser or to any third party for prod- uct liability claims; claims arising from the design, shipment, or installation of the Products, or the cost of other goods or services related to the purchase and installation of the Products. For this Limited Warranty to apply, the Products must be installed in accordance with all site condi- tions required by state and local codes; all other applicable laws; and StormTech’s written in- stallation instructions. (G)THE LIMITED WARRANTY DOES NOT EXTEND TO INCIDENTAL, CONSEQUENTIAL, SPE- CIAL OR INDIRECT DAMAGES. STORMTECH SHALL NOT BE LIABLE FOR PENALTIES OR LIQUIDATED DAMAGES, INCLUDING LOSS OF PRODUCTION AND PROFITS; LABOR AND MATERIALS; OVERHEAD COSTS; OR OTHER LOSS OR EXPENSE INCURRED BY THE PURCHASER OR ANY THIRD PARTY. SPECIFICALLY EXCLUDED FROM LIMITED WAR- RANTY COVERAGE ARE DAMAGE TO THE PRODUCTS ARISING FROM ORDINARY WEAR AND TEAR; ALTERATION, ACCIDENT, MISUSE, ABUSE OR NEGLECT; THE PRODUCTS BEING SUBJECTED TO VEHICLE TRAFFIC OR OTHER CONDITIONS WHICH ARE NOT PERMITTED BY STORMTECH’S WRITTEN SPECIFICATIONS OR INSTALLATION INSTRUC- TIONS; FAILURE TO MAINTAIN THE MINIMUM GROUND COVERS SET FORTH IN THE INSTALLATION INSTRUCTIONS; THE PLACEMENT OF IMPROPER MATERIALS INTO THE PRODUCTS; FAILURE OF THE PRODUCTS DUE TO IMPROPER SITING OR IMPROPER SIZING; OR ANY OTHER EVENT NOT CAUSED BY STORMTECH. THIS LIMITED WAR- RANTY REPRESENTS STORMTECH’S SOLE LIABILITY TO THE PURCHASER FOR CLAIMS RELATED TO THE PRODUCTS, WHETHER THE CLAIM IS BASED UPON CON- TRACT, TORT, OR OTHER LEGAL THEORY. Amount of Stone Per Chamber Note: Volumes are in cubic yards (cubic meters) per chamber. Assumes 6" (150 mm) of separation between chamber rows and 18" (460 mm) of cover. The volume of excavation will vary as the depth of the cover increases. Volume of Excavation Per Chamber Stone Foundation Depth 6" (150 mm) 12" (305 mm) 18" (460 mm) StormTech SC-740 5.5 (4.2) 6.2 (4.7) 6.8 (5.2) Note: Storage volumes are in cubic feet per chamber. Assumes 40% porosity for the stone plus the chamber volume. Storage Volume Per Chamber Bare Chamber and Stone Chamber Stone Foundation Depth Storage in. (mm) ft3 (m3)6(150) 12(305) 18(460) StormTech SC-740 45.9 (1.3) 74.9 (2.1) 81.7 (2.3) 88.4 (2.5) Note: Assumes 6" (150 mm) of stone above, and between chambers. Stone Foundation Depth ENGLISH TONS (CUBIC YARDS) 6" 12" 18" StormTech SC-740 3.8 (2.8 yd 3)4.6 (3.3 yd 3)5.5 (3.9 yd 3) METRIC KILOGRAMS (METER 3)150 mm 305 mm 460 mm StormTech SC-740 3450 (2.1 m 3)4170(2.5m3)4490(3.0m3) 42(1067) 45.90(1.300) 74.90(2.121) 41 (1041) 45.90 (1.300) 73.77 (2.089) 40 (1016) 45.90 (1.300) 72.64 (2.057) 39 (991) 45.90 (1.300) 71.52 (2.025) 38 (965) 45.90 (1.300) 70.39 (1.993) 37 (948) 45.90 (1.300) 69.26 (1.961) 36 (914) 45.90 (1.300) 68.14 (1.929) 35 (889) 45.85 (1.298) 66.98 (1.897) 34 (864) 45.69 (1.294) 65.75 (1.862) 33 (838) 45.41 (1.286) 64.46 (1.825) 32 (813) 44.81 (1.269) 62.97 (1.783) 31 (787) 44.01 (1.246) 61.36 (1.737) 30 (762) 43.06 (1.219) 59.66 (1.689) 29 (737) 41.98 (1.189) 57.89 (1.639) 28 (711) 40.80 (1.155) 56.05 (1.587) 27 (686) 39.54 (1.120) 54.17 (1.534) 26 (660) 38.18 (1.081) 52.23 (1.479) 25 (635) 36.74 (1.040) 50.23 (1.422) 24 (610) 35.22 (0.977) 48.19 (1.365) 23 (584) 33.64 (0.953) 46.11 (1.306) 22 (559) 31.99 (0.906) 44.00 (1.246) 21 (533) 30.29 (0.858) 41.85 (1.185) 20 (508) 28.54 (0.808) 39.67 (1.123) 19 (483) 26.74 (0.757) 37.47 (1.061) 18 (457) 24.89 (0.705) 35.23 (0.997) 17 (432) 23.00 (0.651) 32.96 (0.939) 16 (406) 21.06 (0.596) 30.68 (0.869) 15 (381) 19.09 (0.541) 28.36 (0.803) 14 (356) 17.08 (0.484) 26.03 (0.737) 13 (330) 15.04 (0.426) 23.68 (0.670) 12 (305) 12.97 (0.367) 21.31 (0.608) 11 (279) 10.87 (0.309) 18.92 (0.535) 10 (254) 8.74 (0.247) 16.51 (0.468) 9(229) 6.58(0.186) 14.09(0.399) 8(203) 4.41(0.125) 11.66(0.330) 7(178) 2.21(0.063) 9.21(0.264) 6(152) 0 6.76(0.191) 5(127) 0 5.63(0.160) 4(102) 0 4.51(0.125) 3(76) 0 3.38(0.095) 2(51) 0 2.25(0.064) 1(25) 0 1.13(0.032) Depth of Water Cumulative Total System inSystem ChamberStorage CumulativeStorage Inches (mm) Ft 3 (m3)Ft3(m3) SC-740 Cumulative Storage Volumes Per Chamber Assumes 40% Stone Porosity. Calculations are Based Upon a 6" (152 mm) Stone Base Under the Chambers. Stone Cover Note: Add 1.13 cu. ft. (0.032 m 3)ofstorageforeachadditional inch (25 mm) of stone foundation. Stone Foundation Project: Responsible Party: Address: Date: BPM Name:Page: 1 of 1 Operation & Maintenance Inspection Checklist BMP Element:Potential Problem:Pass Fail Recommended Remediation Bituminous Concrete Roadway Build-up of sediment over the winter months and collection of leaves during the fall months. Erosion is occuring on the side slope. Debris has collected inside the basin. Sediment has accumulated to 4" or above Yard Drain Sediment has accumulated to a depth greater than the original design depth for sediment storage, approximately 1- foot of sediment Sediment has accumulated in void space Down-gradient gullies have formed due to sheet flow concentration Standing water inside basin. Review StormTech Isolator Row and Maintenance Control Manual Inspector's Signature Date Resolution: Sweep roadway using a high-efficiency street sweeper. Removed the sediment and dispose of in accordance with local and state regulations Subsurface Infiltration Basin Inspect control structure to ensure that orifices are not obstructed. Perform maintenance as recommended by manufacturer. Level Spreader Remove the sediment and dispose of in accordance with local and state regulations Fill gullies with native backfill, No. 6 peas- stone, topsoil and erosion control blanket. Sod or re-seed with stablized erosion control grass mix. Sediment Forebay Remedy scoured area. Remove debris and remedy any damaged caused. Remove the sediment and restablish the sediment forebay with vegetation to the origial bottom elevation WRIGHT AVENUECONZ STREETFUL T O N A V E SCALE: DATE: JOB NO.:ph: 413.568.0985 fax: 413.568.0986 rlaland.com40 School Street · P.O. Box 640 · Westfield, MA 01086R LEVESQUE ASSOCIATES, INCA Land Planning Services CompanyBMP LOCATION PLANProposed Parking Lot3 Wright AvenueNorthampton, MAMonarch Enterprises c/o Paul MarcelinaOne Monarch PlaceSpringfield, MA191005 5/8/20 As noted O&M