REQUEST FOR PROPOSAL (RFP) April 4, 2018 CONSTRUCTION OVERSIGHT: INSTALLATION OF CATCH BASINS, CULVERTS AND INFILTRATION CHAMBERS

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1 Ascutney Professional Building, Route 5 Post Office Box 320, Ascutney, VT / Fax REQUEST FOR PROPOSAL (RFP) April 4, 2018 CONSTRUCTION OVERSIGHT: INSTALLATION OF CATCH BASINS, CULVERTS AND INFILTRATION CHAMBERS Springfield, VT Transfer Station Facility ANDOVER BALTIMORE C A V E N D I S H CHESTER L U D L O W READING SPRINGFIELD W E A T H E R S F I E L D W E S T W I N D S O R W I N D S O R

2 The Southern Windsor County Regional Planning Commission (hereinafter SWCRPC ), the Ottauquechee Natural Resources Conservation District (hereinafter ONRCD ) and the Town of Springfield (hereinafter the Town ) invite qualified firms to submit project bids for construction oversight of previously designed stormwater infrastructure at the Springfield, VT transfer station facility. Sealed bids must be mailed to Chris Yurek at Post Office Box 320, Ascutney, Vermont no later than the response deadline of May 11, Late proposals will not be considered. I. BACKGROUND & SUMMARY The Town of Springfield s transfer station facility directly abuts the Lower Black River. Presently, a majority of the runoff from the facilities parking lot and rooftops feed into a catch basin that straight pipes the untreated runoff directly into the Black River, carrying with it excess sediment, nutrients and other pollutants. As such, this parcel is considered by the Vermont Agency of Natural Resources (VT ANR) to be of high priority for stormwater treatment. In November, 2016, ONRCD received funds from the Vermont Department of Environmental Conservations (VT DEC) Ecosystem Restoration Program (ERP) and hired Watershed Consulting Associates, LLC and Aldrich & Elliot Water Resource Engineers, PC to evaluate stormwater management and treatment at the facility. The Project Team conducted an existing conditions site assessment and an alternatives analysis to compare the feasibility and cost/treatment effectiveness of three potential options for stormwater treatment. The selected option was subsequently brought to 100% design. The design plans call for installation of a series of StormTech DC-780 infiltration chambers with additional catch basins and culverts installed throughout the facility to route stormwater from a larger portion of the parcel to the chambers. Detailed engineering plans and construction specifications are included later in this RFP. With assistance from the SWCRPC, ONRCD recently received an additional ERP grant to implement those plans. In an effort to ensure those plans are implemented as designed and in accordance with the 2017 Vermont Stormwater Management Manual Rule, the Project Partners desire to hire a qualified consulting and/or engineering firm to oversee construction. It is anticipated that construction will begin during the summer of II. ANTICIPATED SCOPE OF WORK The primary aspect of this work will involve construction stakeout, construction oversight, and inspection/certification once construction is complete. At this time, it is assumed that this project will not require any permits (see Attachment E for correspondence with applicable permitting entities). However, if it is discovered that a permit is required, the selected consultant may be asked to assist in receiving that permit as necessary/as budget allows. Additionally, the selected consultant shall quickly review the earthwork RFP prior to release and attend/facilitate a pre-bid meeting with earth-work contractors that are interested in bidding. This meeting will involve providing a technical description of the work to be done as well as fielding technical questions. This project involves a number of different components, including installation of infiltration chambers, catch basins and culverts, as well as reduction of impervious surface, an enhancement of the existing Page 2 of 4

3 riparian buffer and removal of two small storage sheds from the delineated River Corridor. The selected consultant will not be responsible for coordinating or overseeing the riparian planting component nor the relocation of the storage sheds. III. TENTATIVE PROJECT SCHEDULE It is anticipated that construction will commence during the summer of 2018, likely during July. Work is expected to last between 1-2 weeks or less. IV. REQUIRED PROPOSAL CONTENT Interested bidders shall provide a completed Scope of Services as needed to complete the Scope of Work described herein. The proposal shall contain the following sections: A. TECHNICAL: Describe the approach to be taken in addressing the Scope of Work. Specific tasks should be described briefly but in reasonable detail. B. QUALIFICATIONS: Describe the Firm s related experience in design and oversight of stormwater management and treatment projects. A statement demonstrating familiarity and experience with similar projects will be of particular interest. C. COST PROPOSAL: The information requested in this section is required to support the reasonableness of your quotation. Please provide the following: Estimated hours Rate per hour Total cost for each category and overall cost D. PROOF OF INSURANCE: Proposals should include proof of general liability and property damage insurance, having all major divisions of coverage including: Premises Operations Independent Contractor s Protective Products and Completed Operations Personal Injury Liability Contractual Liability The policy shall be on an occurrence form and limits shall not be less than: $1,000,000 per Occurrence $1,000,000 General Aggregate $1,000,000 Products/Completed Product Aggregate E. REFERENCES: Please include at least two contacts for clients provided with similar services. V. BUDGET Funding for this project is provided by a grant through the Vermont Agency of Natural Resources (VT ANR) Department of Environmental Conservation (DEC) Ecosystem Restoration Program (ERP). The budget for construction oversight services is not to exceed $8, Page 3 of 4

4 VI. EVALUATION OF PROPOSALS Evaluation will be done by committee, comprised of representatives from the Town of Springfield, the Ottauquechee Natural Resources Conservation District, the Southern Windsor County Regional Planning Commission, and the Vermont Department of Environmental Conservation. Evaluation of proposals will consider, but may not be limited to: Proposed cost (40 points) General qualifications (20 points) Experience with similar projects (25 points) Technical approach (15 points) VII. CUSTOMARY STATE GRANT PROVISIONS Should your firm be selected, the Contract will be subject to the State of Vermont Customary Grant Provisions. These provisions can be found at the below hyperlink: VIII. PROCESS SWCRPC, ONRCD, VT DEC and the Town of Springfield will review proposals submitted in response to this RFP and will select one firm to perform the work. These entities reserve the right to seek clarification of any response submitted as well as the right to accept or reject any or all proposals. Expenses incurred in the preparation of proposals shall be borne by the respondent(s) with the express understanding that the respondent(s) may not apply for reimbursement for the expenses. EOE; minority-and-women owned businesses are urged to submit proposals. Sealed bids submitted in response to this RFP should be mailed to Chris Yurek at P.O. Box 320, Ascutney, VT by May 11, Late proposals will not be considered. If you have any questions pertaining to this RFP or desire additional information, please contact Chris Yurek at or by phone at BID PROCESS TIMELINE BID STEP DATE 1. RFP Issued April 4, Questions regarding RFP due to SWCRPC April 16, SWCRPC responds to questions April 25, Proposals due to SWCRPC May 11, 2018 Page 4 of 4

5 ATTACHMENT A 100% DESIGN PLANS

6 Aldrich + Elliott WATER RESOURCE ENGINEERS 6 Market Place, Suite 2 Essex Jct., VT P: AEengineers.com Y:\16085-SPRINGFIELD\ dwg, 5/15/2017 8:29:41 AM

7 Aldrich + Elliott WATER RESOURCE ENGINEERS 6 Market Place, Suite 2 Essex Jct., VT P: AEengineers.com Y:\16085-SPRINGFIELD\ dwg, 5/10/2017 2:19:40 PM

8 Aldrich + Elliott WATER RESOURCE ENGINEERS 6 Market Place, Suite 2 Essex Jct., VT P: AEengineers.com Y:\16085-SPRINGFIELD\ dwg, 5/15/2017 8:47:10 AM

9 ATTACHMENT B HydroCAD MODELING REPORT

10 3S DA 1 6P CB overflow manhole 1P 7P stormtech chambers Black River Subcat Reach Pond Link Routing Diagram for SpringfieldTransferStation_ Prepared by Hewlett-Packard Company, Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC

11 SpringfieldTransferStation_ Prepared by Hewlett-Packard Company HydroCAD s/n HydroCAD Software Solutions LLC Printed 5/16/2017 Page 2 Area (acres) CN Description (subcatchment-numbers) Area Listing (all nodes) >75% Grass cover, Good, HSG B (3S) Paved Parking, HSG B (3S) TOTAL AREA

12 SpringfieldTransferStation_ Prepared by Hewlett-Packard Company HydroCAD s/n HydroCAD Software Solutions LLC Printed 5/16/2017 Page 3 Area (acres) Soil Group Subcatchment Numbers HSG A HSG B 3S HSG C HSG D Other TOTAL AREA Soil Listing (all nodes)

13 SpringfieldTransferStation_ Prepared by Hewlett-Packard Company HydroCAD s/n HydroCAD Software Solutions LLC Printed 5/16/2017 Page 4 HSG-A (acres) HSG-B (acres) HSG-C (acres) Ground Covers (all nodes) HSG-D (acres) Other (acres) Total (acres) Ground Cover >75% Grass cover, Good 3S Paved Parking 3S TOTAL AREA Subcatchment Numbers

14 SpringfieldTransferStation_ Prepared by Hewlett-Packard Company HydroCAD s/n HydroCAD Software Solutions LLC Printed 5/16/2017 Page 5 Line# Node Number In-Invert (feet) Out-Invert (feet) Pipe Listing (all nodes) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 6P P

15 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 6 Time span= hrs, dt=0.01 hrs, points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 3S: DA 1 Runoff Area=1.616 ac 79.15% Impervious Runoff Depth=1.64" Flow Length=254' Slope= '/' Tc=12.9 min CN=WQ Runoff=3.27 cfs af Pond 1P: stormtech chambers Peak Elev=96.75' Storage=2,664 cf Inflow=3.27 cfs af Outflow=0.61 cfs af Pond 6P: overflow manhole Peak Elev=96.84' Inflow=3.27 cfs af Primary=3.27 cfs af Secondary=0.00 cfs af Outflow=3.27 cfs af Pond 7P: Black River Inflow=0.00 cfs af Primary=0.00 cfs af Total Runoff Area = ac Runoff Volume = af Average Runoff Depth = 1.64" 20.85% Pervious = ac 79.15% Impervious = ac

16 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 3S: DA 1 Runoff = hrs, Volume= af, Depth= 1.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.27" Area (ac) CN Description >75% Grass cover, Good, HSG B Paved Parking, HSG B Weighted Average % Pervious Area % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) Lag/CN Method, Contour Length= 234' Interval= 1' Subcatchment 3S: DA 1 Hydrograph Flow (cfs) cfs Type II 24-hr 1-yr Rainfall=2.27" Runoff Area=1.616 ac Runoff Volume=0.221 af Runoff Depth=1.64" Flow Length=254' Slope= '/' Tc=12.9 min CN=WQ Runoff Time (hours)

17 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 8 Summary for Pond 1P: stormtech chambers [87] Warning: Oscillations may require smaller dt or Finer Routing (severity=506) Inflow Area = ac, 79.15% Impervious, Inflow Depth = 1.64" for 1-yr event Inflow = hrs, Volume= af Outflow = hrs, Volume= af, Atten= 81%, Lag= 0.0 min Discarded = hrs, Volume= af Routing by Dyn-Stor-Ind method, Time Span= hrs, dt= 0.01 hrs Peak Elev= hrs Surf.Area= 1,817 sf Storage= 2,664 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 23.2 min ( ) Volume Invert Avail.Storage Storage Description #1A 94.49' 1,899 cf 30.00'W x 60.58'L x 3.83'H Field A 6,966 cf Overall - 2,219 cf Embedded = 4,747 cf x 40.0% Voids #2A 95.24' 2,219 cf ADS_StormTech DC-780 +Cap x 48 Inside #1 Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 6 Rows of 8 Chambers 4,118 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 94.49' in/hr Exfiltration over Surface area Discarded OutFlow Max= hrs HW=94.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.61 cfs)

18 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 9 Pond 1P: stormtech chambers - Chamber Wizard Field A Chamber Model = ADS_StormTech DC-780 +Cap (ADS StormTech DC-780 with cap length) Effective Size= 45.4"W x 30.0"H => 6.49 sf x 7.12'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing 8 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 58.58' Row Length +12.0" End Stone x 2 = 60.58' Base Length 6 Rows x 51.0" Wide + 6.0" Spacing x " Side Stone x 2 = 30.00' Base Width 9.0" Base " Chamber Height + 7.0" Cover = 3.83' Field Height 48 Chambers x 46.2 cf = 2,219.5 cf Chamber Storage 6,966.3 cf Field - 2,219.5 cf Chambers = 4,746.8 cf Stone x 40.0% Voids = 1,898.7 cf Stone Storage Chamber Storage + Stone Storage = 4,118.2 cf = af Overall Storage Efficiency = 59.1% Overall System Size = 60.58' x 30.00' x 3.83' 48 Chambers cy Field cy Stone

19 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 10 Pond 1P: stormtech chambers Hydrograph cfs Inflow Area=1.616 ac Peak Elev=96.75' Storage=2,664 cf Inflow Discarded Flow (cfs) cfs Time (hours)

20 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 11 [57] Hint: Peaked at 96.84' (Flood elevation advised) Summary for Pond 6P: overflow manhole Inflow Area = ac, 79.15% Impervious, Inflow Depth = 1.64" for 1-yr event Inflow = hrs, Volume= af Outflow = hrs, Volume= af, Atten= 0%, Lag= 0.0 min Primary = hrs, Volume= af Secondary = hrs, Volume= af Routing by Dyn-Stor-Ind method, Time Span= hrs, dt= 0.01 hrs Peak Elev= hrs Device Routing Invert Outlet Devices #1 Device ' 12.0" Horiz. standpipe in CB C= Limited to weir flow at low heads #2 Secondary 95.84' 12.0" Round existing outlet to river L= 170.0' CPP, square edge headwall, Ke= Inlet / Outlet Invert= 95.84' / 94.27' S= '/' Cc= n= PVC, smooth interior, Flow Area= 0.79 sf #3 Primary 95.84' 12.0" Round inlet to chambers X 2.00 L= 271.0' CPP, square edge headwall, Ke= Inlet / Outlet Invert= 95.84' / 95.25' S= '/' Cc= n= Corrugated PE, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max= hrs HW=96.84' TW=95.82' (Dynamic Tailwater) 3=inlet to chambers (Barrel Controls fps) Secondary OutFlow Max= hrs HW=95.84' TW=0.00' (Dynamic Tailwater) 2=existing outlet to river ( Controls 0.00 cfs) 1=standpipe in CB ( Controls 0.00 cfs)

21 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 12 Pond 6P: overflow manhole Hydrograph 3.27 cfs 3.27 cfs 3.27 cfs Inflow Area=1.616 ac Peak Elev=96.84' Inflow Outflow Primary Secondary 3 Flow (cfs) cfs Time (hours)

22 SpringfieldTransferStation_ Type II 24-hr 1-yr Rainfall=2.27" Prepared by Hewlett-Packard Company Printed 5/16/2017 HydroCAD s/n HydroCAD Software Solutions LLC Page 13 [40] Hint: Not Described (Outflow=Inflow) Summary for Pond 7P: Black River Inflow = hrs, Volume= af Primary = hrs, Volume= af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= hrs, dt= 0.01 hrs Pond 7P: Black River Hydrograph 1 Inflow Primary Flow (cfs) 0.00 cfs 0.00 cfs Time (hours)

23 ATTACHMENT C ADS SHOP DRAWINGS

24 R ADVANCED DRAINAGE SYSTEMS, INC. Springfield Transfer Station Springfield, VT STORMTECH CHAMBER SPECIFICATIONS 1. CHAMBERS SHALL BE STORMTECH DC-780 OR APPROVED EQUAL.^J 2. CHAMBERS SHALL BE MADE FROM VIRGIN, IMPACT-MODIFIED POLYPROPYLENE COPOLYMERS.^J 3. CHAMBER ROWS SHALL PROVIDE CONTINUOUS, UNOBSTRUCTED INTERNAL SPACE WITH NO INTERNAL SUPPORT PANELS THAT WOULD IMPEDE FLOW OR LIMIT ACCESS FOR INSPECTION. 4. THE STRUCTURAL DESIGN OF THE CHAMBERS, THE STRUCTURAL BACKFILL, AND THE INSTALLATION REQUIREMENTS SHALL ENSURE THAT THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS, SECTION 12.12, ARE MET FOR: 1) LONG-DURATION DEAD LOADS AND 2) SHORT-DURATION LIVE LOADS, BASED ON THE AASHTO DESIGN TRUCK WITH CONSIDERATION FOR IMPACT AND MULTIPLE VEHICLE PRESENCES. 5. CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 6. CHAMBERS SHALL BE DESIGNED AND ALLOWABLE LOADS DETERMINED IN ACCORDANCE WITH ASTM F2787, "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 7. ONLY CHAMBERS THAT ARE APPROVED BY THE SITE DESIGN ENGINEER WILL BE ALLOWED. THE CHAMBER MANUFACTURER SHALL SUBMIT THE FOLLOWING UPON REQUEST TO THE SITE DESIGN ENGINEER FOR APPROVAL BEFORE DELIVERING CHAMBERS TO THE PROJECT SITE: a. A STRUCTURAL EVALUATION SEALED BY A REGISTERED PROFESSIONAL ENGINEER THAT DEMONSTRATES THAT THE SAFETY FACTORS ARE GREATER THAN OR EQUAL TO 1.95 FOR DEAD LOAD AND 1.75 FOR LIVE LOAD, THE MINIMUM REQUIRED BY ASTM F2787 AND BY AASHTO FOR THERMOPLASTIC PIPE.^J b. A STRUCTURAL EVALUATION SEALED BY A REGISTERED PROFESSIONAL ENGINEER THAT DEMONSTRATES THAT THE LOAD FACTORS SPECIFIED IN THE AASHTO BRIDGE DESIGN SPECIFICATIONS, SECTION 12.12, ARE MET. THE 50 YEAR CREEP MODULUS DATA SPECIFIED IN ASTM F2418 OR ASTM F2922 MUST BE USED AS PART OF THE AASHTO STRUCTURAL EVALUATION TO VERIFY LONG-TERM PERFORMANCE.^J c. STRUCTURAL CROSS SECTION DETAIL ON WHICH THE STRUCTURAL EVALUATION IS BASED.^J 8. CHAMBERS AND END CAPS SHALL BE PRODUCED AT AN ISO 9001 CERTIFIED MANUFACTURING FACILITY. IMPORTANT - NOTES FOR THE BIDDING AND INSTALLATION OF THE DC-780 CHAMBER SYSTEM 1. STORMTECH DC-780 CHAMBERS SHALL NOT BE INSTALLED UNTIL THE MANUFACTURER'S REPRESENTATIVE HAS COMPLETED A PRE-CONSTRUCTION MEETING WITH THE INSTALLERS.^J 2. STORMTECH DC-780 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH SC-310/SC-740/DC-780 CONSTRUCTION GUIDE".^J 3. CHAMBERS ARE NOT TO BE BACKFILLED WITH A DOZER OR AN EXCAVATOR SITUATED OVER THE CHAMBERS.^J STORMTECH RECOMMENDS 3 BACKFILL METHODS: STONESHOOTER LOCATED OFF THE CHAMBER BED. BACKFILL AS ROWS ARE BUILT USING AN EXCAVATOR ON THE FOUNDATION STONE OR SUBGRADE. BACKFILL FROM OUTSIDE THE EXCAVATION USING A LONG BOOM HOE OR EXCAVATOR. 4. THE FOUNDATION STONE SHALL BE LEVELED AND COMPACTED PRIOR TO PLACING CHAMBERS.^J 5. JOINTS BETWEEN CHAMBERS SHALL BE PROPERLY SEATED PRIOR TO PLACING STONE.^J 6. MAINTAIN MINIMUM - 6" (150 mm) SPACING BETWEEN THE CHAMBER ROWS.^J 7. EMBEDMENT STONE SURROUNDING CHAMBERS MUST BE A CLEAN, CRUSHED, ANGULAR STONE 3/4-2" (20-50 mm).^j 8. THE CONTRACTOR MUST REPORT ANY DISCREPANCIES WITH CHAMBER FOUNDATION MATERIALS BEARING CAPACITIES TO THE SITE DESIGN ENGINEER.^J 9. ADS RECOMMENDS THE USE OF "FLEXSTORM CATCH IT" INSERTS DURING CONSTRUCTION FOR ALL INLETS TO PROTECT THE SUBSURFACE STORMWATER MANAGEMENT SYSTEM FROM CONSTRUCTION SITE RUNOFF. NOTES FOR CONSTRUCTION EQUIPMENT^J 1. STORMTECH DC-780 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH SC-310/SC-740/DC-780 CONSTRUCTION GUIDE".^J 2. THE USE OF CONSTRUCTION EQUIPMENT OVER DC-780 CHAMBERS IS LIMITED: NO EQUIPMENT IS ALLOWED ON BARE CHAMBERS. NO RUBBER TIRED LOADERS, DUMP TRUCKS, OR EXCAVATORS ARE ALLOWED UNTIL PROPER FILL DEPTHS ARE REACHED IN ACCORDANCE WITH THE "STORMTECH SC-310/SC-740/DC-780 CONSTRUCTION GUIDE". WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT CAN BE FOUND IN THE "STORMTECH SC-310/SC-740/DC-780 CONSTRUCTION GUIDE".^J 3. FULL 36" (900 mm) OF STABILIZED COVER MATERIALS OVER THE CHAMBERS IS REQUIRED FOR DUMP TRUCK TRAVEL OR DUMPING. USE OF A DOZER TO PUSH EMBEDMENT STONE BETWEEN THE ROWS OF CHAMBERS MAY CAUSE DAMAGE TO THE CHAMBERS AND IS NOT AN ACCEPTABLE BACKFILL METHOD. ANY CHAMBERS DAMAGED BY THE "DUMP AND PUSH" METHOD ARE NOT COVERED UNDER THE STORMTECH STANDARD WARRANTY. CONTACT STORMTECH AT WITH ANY QUESTIONS ON INSTALLATION REQUIREMENTS OR WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT ADS, INC.

25 CONCEPTUAL LAYOUT (48) STORMTECH DC-780 CHAMBERS (12) STORMTECH DC-780 END CAPS INSTALLED WITH 6 " COVER STONE, 9 " BASE STONE, 40% STONE VOID INSTALLED SYSTEM VOLUME: 4245 CF AREA OF SYSTEM: 1942 PERIMETER OF SYSTEM: 189 FT 24" PREFABRICATED END CAP PART# SC740EPE24B TYP OF ALL DC " CONNECTIONS AND ISOLATOR ROWS PROPOSED STRUCTURE W/ELEVATED BYPASS MANIFOLD (DESIGN BY ENGINEER / PROVIDED BY OTHERS) 12" x 12" ADS N-12 TOP MANIFOLD, INV 12.50" ABOVE CHAMBER BASE (SIZE TBD BY ENGINEER / SEE TECH SHEET #7 FOR MANIFOLD SIZING GUIDANCE) PLACE MINIMUM 12.5' OF ADS GEOSYNTHETICS 315WTK WOVEN GEOTEXTILE OVER BEDDING STONE AND UNDERNEATH CHAMBER FEET FOR SCOUR PROTECTION AT ALL CHAMBER INLET ROWS COMPUTER GENERATED CONCEPTUAL LAYOUT - NOT FOR CONSTRUCTION 64.75' 58.54' ISOLATOR ROW INSPECTION PORT SHEET OF 2 5 ADVANCED DRAINAGE SYSTEMS, INC. R 4640 TRUEMAN BLVD HILLIARD, OH NOT TO SCALE Detention Retention Water Quality 70INWOODROAD,SUITE3 ROCKYHILL CT ' 30.00' REV DRW CHK DESCRIPTION DATE: Springfield Transfer Station Springfield, VT PROJECT #: Tool 04/24/2017 DRAWN: AC CHECKED: THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS. ---

26 R NOTES: D C B A MATERIAL LOCATION FINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THE TOP OF THE 'C' LAYER TO THE BOTTOM OF FLEXIBLE PAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THAT PAVEMENT SUBBASE MAY BE PART OF THE 'D' LAYER INITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THE TOP OF THE EMBEDMENT STONE ('B' LAYER) TO 18" (450 mm) ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENT SUBBASE MAY BE A PART OF THE 'C' LAYER. EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS FROM THE FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYER ABOVE. FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE SUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER. ACCEPTABLE FILL MATERIALS: STORMTECH DC-780 CHAMBER SYSTEMS PLEASE NOTE: 1. THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE". 2. STORMTECH COMPACTION REQUIREMENTS ARE MET FOR 'A' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 9" (230 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR. 3. WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FOR COMPACTION REQUIREMENTS. PERIMETER STONE (SEE NOTE 6) EXCAVATION WALL (CAN BE SLOPED OR VERTICAL) 12" (300 mm) MIN ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE ALL AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS DESCRIPTION ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS. CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS. GRANULAR WELL-GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR PROCESSED AGGREGATE. SC-740/DC-780 END CAP MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS LAYER. CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) SUBGRADE SOILS (SEE NOTE 5) AASHTO MATERIAL CLASSIFICATIONS 1. DC-780 CHAMBERS SHALL CONFORM TO THE REQUIREMENTS OF ASTM F2418 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".^J 2. DC-780 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".^J 3. "ACCEPTABLE FILL MATERIALS" TABLE ABOVE PROVIDES MATERIAL LOCATIONS, DESCRIPTIONS, GRADATIONS, AND COMPACTION REQUIREMENTS FOR FOUNDATION, EMBEDMENT, AND FILL MATERIALS.^J 4. THE "SITE DESIGN ENGINEER" REFERS TO THE ENGINEER RESPONSIBLE FOR THE DESIGN AND LAYOUT OF THE STORMTECH CHAMBERS FOR THIS PROJECT.^J 5. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH CONSIDERATION FOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS.^J 6. PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS. 7. ONCE LAYER 'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER 'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION. D C B A N/A AASHTO M145¹ A-1, A-2-4, A-3 OR AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 6" (150 mm) MIN AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 PAVEMENT LAYER (DESIGNED BY SITE DESIGN ENGINEER) *TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR, INCREASE COVER TO 24" (600 mm). 51" (1295 mm) COMPACTION / DENSITY REQUIREMENT PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND PREPARATION REQUIREMENTS. BEGIN COMPACTIONS AFTER 12" (300 mm) OF MATERIAL OVER THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN 6" (150 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR PROCESSED AGGREGATE MATERIALS. ROLLER GROSS VEHICLE WEIGHT NOT TO EXCEED 12,000 lbs (53 kn). DYNAMIC FORCE NOT TO EXCEED 20,000 lbs (89 kn). NO COMPACTION REQUIRED. PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE. ² ³ 6" (150 mm) MIN 30" (760 mm) 12" (300 mm) TYP 18" (450 mm) MIN* 12' (3.7 m) MAX DEPTH OF STONE TO BE DETERMINED BY DESIGN ENGINEER 9" (230 mm) MIN Springfield Transfer Station Springfield, VT REV DRW CHK DESCRIPTION 4640 TRUEMAN BLVD HILLIARD, OH ADVANCED DRAINAGE SYSTEMS, INC. 04/24/2017 DRAWN: AC Tool CHECKED: --- DATE: PROJECT #: Detention Retention Water Quality 70INWOODROAD,SUITE3 ROCKYHILL CT THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS. SHEET 3 OF 5

27 R STORMTECH HIGHLY RECOMMENDES FLEXSTORM PURE INSERTS IN ANY UPSTREAM STRUCTURES WITH OPEN GRATES INSPECTION & MAINTENANCE STEP 1) STEP 2) STEP 3) STEP 4) NOTES COVER ENTIRE ISOLATOR ROW WITH ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE 8' (2.4 m) MIN WIDE SUMP DEPTH TBD BY SITE DESIGN ENGINEER (24" [600 mm] MIN RECOMMENDED) CATCH BASIN OR MANHOLE INSPECT ISOLATOR ROW FOR SEDIMENT A. INSPECTION PORTS (IF PRESENT) A.1. REMOVE/OPEN LID ON NYLOPLAST INLINE DRAIN A.2. REMOVE AND CLEAN FLEXSTORM FILTER IF INSTALLED A.3. USING A FLASHLIGHT AND STADIA ROD, MEASURE DEPTH OF SEDIMENT AND RECORD ON MAINTENANCE LOG A.4. LOWER A CAMERA INTO ISOLATOR ROW FOR VISUAL INSPECTION OF SEDIMENT LEVELS (OPTIONAL) A.5. IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3. B. ALL ISOLATOR ROWS B.1. REMOVE COVER FROM STRUCTURE AT UPSTREAM END OF ISOLATOR ROW B.2. USING A FLASHLIGHT, INSPECT DOWN THE ISOLATOR ROW THROUGH OUTLET PIPE^Ji) MIRRORS ON POLES OR CAMERAS MAY BE USED TO AVOID A CONFINED SPACE ENTRY^Jii) FOLLOW OSHA REGULATIONS FOR CONFINED SPACE ENTRY IF ENTERING MANHOLE B.3. IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3. CLEAN OUT ISOLATOR ROW USING THE JETVAC PROCESS A. A FIXED CULVERT CLEANING NOZZLE WITH REAR FACING SPREAD OF 45" (1.1 m) OR MORE IS PREFERRED B. APPLY MULTIPLE PASSES OF JETVAC UNTIL BACKFLUSH WATER IS CLEAN C. VACUUM STRUCTURE SUMP AS REQUIRED REPLACE ALL COVERS, GRATES, FILTERS, AND LIDS; RECORD OBSERVATIONS AND ACTIONS. INSPECT AND CLEAN BASINS AND MANHOLES UPSTREAM OF THE STORMTECH SYSTEM. 24" (600 mm) HDPE ACCESS PIPE REQUIRED USE FACTORY PRE-FABRICATED END CAP PART #: SC740EPE24B DC-780 CHAMBER DC-780 ISOLATOR ROW DETAIL NTS CONCRETE COLLAR 18" (450 mm) MIN WIDTH 1. INSPECT EVERY 6 MONTHS DURING THE FIRST YEAR OF OPERATION. ADJUST THE INSPECTION INTERVAL BASED ON PREVIOUS 2. OBSERVATIONS OF SEDIMENT ACCUMULATION AND HIGH WATER ELEVATIONS.^J ON CORRUGATION CREST CONDUCT JETTING AND VACTORING ANNUALLY OR WHEN INSPECTION SHOWS THAT MAINTENANCE IS NECESSARY. DC-780 CHAMBER PAVEMENT CONCRETE SLAB 8" (200 mm) MIN THICKNESS FLEXSTORM CATCH IT PART# 6212NYFX WITH USE OF OPEN GRATE 6" (150 mm) INSERTA TEE PART#06N12ST74IP INSERTA TEE TO BE CENTERED OPTIONAL INSPECTION PORT DC-780/SC-740 END CAP TWO LAYERS OF ADS GEOSYNTHETICS 315WTK WOVEN GEOTEXTILE BETWEEN FOUNDATION STONE AND CHAMBERS 5' (1.5 m) MIN WIDE CONTINUOUS FABRIC WITHOUT SEAMS DC-780 6" INSPECTION PORT DETAIL NTS CONCRETE COLLAR NOT REQUIRED FOR UNPAVED APPLICATIONS 12" (300 mm) NYLOPLAST INLINE DRAIN BODY W/SOLID HINGED COVER OR GRATE PART# 2712AG06N SOLID COVER: 1299CGC GRATE: 1299CGS Springfield Transfer Station Springfield, VT REV DRW CHK DESCRIPTION 4640 TRUEMAN BLVD HILLIARD, OH ADVANCED DRAINAGE SYSTEMS, INC. 04/24/2017 DRAWN: AC DATE: Detention Retention Water Quality 6" (150 mm) ADS N-12 HDPE PIPE 70INWOODROAD,SUITE3 ROCKYHILL CT SHEET --- CHECKED: Tool PROJECT #: OF 5 THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.

28 R CONVEYANCE PIPE MATERIAL MAY VARY (PVC, HDPE, ETC.) INSERTA TEE CONNECTION PLACE ADS GEOSYNTHETICS 315 WOVEN GEOTEXTILE (CENTERED ON INSERTA-TEE INLET) OVER BEDDING STONE FOR SCOUR PROTECTION AT SIDE INLET CONNECTIONS. GEOTEXTILE MUST EXTEND 6" (150 mm) PAST CHAMBER FOOT INSERTA TEE DETAIL NTS NOTE: PART NUMBERS WILL VARY BASED ON INLET PIPE MATERIALS. CONTACT STORMTECH FOR MORE INFORMATION. (X) INTENTIONALLY LEFT BLANK SECTION A-A CHAMBER INSERTA TEE TO BE INSTALLED, CENTERED OVER CORRUGATION MAX DIAMETER OF INSERTA TEE A A SIDE VIEW DO NOT INSTALL INSERTA-TEE AT CHAMBER JOINTS HEIGHT FROM BASE OF CHAMBER (X) SC-310 6" (150 mm) 4" (100 mm) SC " (250 mm) 4" (100 mm) DC " (250 mm) 4" (100 mm) MC " (300 mm) 6" (150 mm) MC " (300 mm) 8" (200 mm) INSERTA TEE FITTINGS AVAILABLE FOR SDR 26, SDR 35, SCH 40 IPS GASKETED & SOLVENT WELD, N-12, HP STORM, C-900 OR DUCTILE IRON 12.2" (310 mm) NOMINAL CHAMBER SPECIFICATIONS SIZE (W X H X INSTALLED LENGTH) 51.0" X 30.0" X 85.4" (1295 mm X 762 mm X 2169 mm) CHAMBER STORAGE 46.2 CUBIC FEET (1.30 m³) MINIMUM INSTALLED STORAGE* 78.4 CUBIC FEET (2.20 m³) WEIGHT 75.0 lbs. (33.6 kg) *ASSUMES 6" (152 mm) STONE ABOVE, 9" (229 mm) BELOW, AND 6" (152 mm) BETWEEN CHAMBERS STUBS AT BOTTOM OF END CAP FOR PART NUMBERS ENDING WITH "B" STUBS AT TOP OF END CAP FOR PART NUMBERS ENDING WITH "T" PART # STUB A B C SC740EPE06T / SC740EPE06TPC 18.5" (470 mm) --- 6" (150 mm) 10.9" (277 mm) SC740EPE06B / SC740EPE06BPC " (13 mm) SC740EPE08T / SC740EPE08TPC 16.5" (419 mm) --- 8" (200 mm) 12.2" (310 mm) SC740EPE08B / SC740EPE08BPC " (15 mm) SC740EPE10T / SC740EPE10TPC 14.5" (368 mm) " (250 mm) 13.4" (340 mm) SC740EPE10B / SC740EPE10BPC " (18 mm) SC740EPE12T / SC740EPE12TPC 12.5" (318 mm) " (300 mm) 14.7" (373 mm) SC740EPE12B / SC740EPE12BPC " (30 mm) SC740EPE15T / SC740EPE15TPC 9.0" (229 mm) " (375 mm) 18.4" (467 mm) SC740EPE15B / SC740EPE15BPC " (33 mm) SC740EPE18T/ SC740EPE18TPC 5.0" (127 mm) " (450 mm) 19.7" (500 mm) SC740EPE18B / SC740EPE18BPC " (41 mm) SC740EPE24B* 24" (600 mm) 18.5" (470 mm) " (3 mm) ALL STUBS, EXCEPT FOR THE SC740EPE24B ARE PLACED AT BOTTOM OF END CAP SUCH THAT THE OUTSIDE DIAMETER OF THE STUB IS FLUSH WITH THE BOTTOM OF THE END CAP. FOR ADDITIONAL INFORMATION CONTACT STORMTECH AT * FOR THE SC740EPE24B THE 24" (600 mm) STUB LIES BELOW THE BOTTOM OF THE END CAP APPROXIMATELY 1.75" (44 mm). BACKFILL MATERIAL SHOULD BE REMOVED FROM BELOW THE N-12 STUB SO THAT THE FITTING SITS LEVEL. NOTE: ALL DIMENSIONS ARE NOMINAL DC-780 TECHNICAL SPECIFICATION NTS 90.7" (2304 mm) ACTUAL LENGTH 85.4" (2169 mm) INSTALLED LENGTH ACCEPTS 4" (100 mm) SCH 40 PVC PIPE FOR INSPECTION PORT. FOR PIPE SIZES LARGER THAN 4" (100 mm) UP TO 10" (250 mm) USE INSERTA TEE CONNECTION CENTERED ON A CHAMBER CREST CORRUGATION 29.3" (744 mm) 45.9" (1166 mm) BUILD ROW IN THIS DIRECTION OVERLAP NEXT CHAMBER HERE (OVER SMALL CORRUGATION) B 51.0" (1295 mm) A C 30.0" (762 mm) START END Springfield Transfer Station Springfield, VT REV DRW CHK DESCRIPTION 4640 TRUEMAN BLVD HILLIARD, OH ADVANCED DRAINAGE SYSTEMS, INC. 04/24/2017 DRAWN: AC DATE: Detention Retention Water Quality A 70INWOODROAD,SUITE3 ROCKYHILL CT SHEET --- CHECKED: Tool PROJECT #: OF 5 THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.

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30 ATTACHMENT D DRAINAGE AREA MAPS

31 Drainage Area Acres Drainage Area Acres B l a c k R i v e r Legend Drainage Area Boundaries Parcel Boundaries ± ft Service Layer Credits: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community Springfield Transfer Station Drainage Areas Springfield, VT Map Produced: 2/28/2017

32 ATTACHMENT E PERMITTING COORESPONDENCE

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40 ATTACHMENT F STORMTECH CONSTRUCTION GUIDE

41 SC-310/SC-740/DC-780 StormTech Construction Guide Detention Retention Water Quality A division of REQUIRED MATERIALS AND EQUIPMENT LIST Acceptable fill materials per Table 1 Woven and non-woven geotextiles StormTech solid end caps and pre-cored end caps StormTech chambers StormTech manifolds and fittings IMPORTANT NOTES: A. This installation guide provides the minimum requirements for proper installation of chambers. Non-adherence to this guide may result in damage to chambers during installation. Replacement of damaged chambers during or after backfilling is costly and very time consuming. It is recommended that all installers are familiar with this guide, and that the contractor inspects the chambers for distortion, damage and joint integrity as work progresses. B. Use of a dozer to push embedment stone between the rows of chambers may cause damage to chambers and is not an acceptable backfill method. Any chambers damaged by using the dump and push method are not covered under the StormTech standard warranty. C. Care should be taken in the handling of chambers and end caps. Avoid dropping, prying or excessive force on chambers during removal from pallet and initial placement. Requirements for System Installation Excavate bed and prepare subgrade per engineer's plans. Place non-woven geotextile over prepared soils and up excavation walls. Install underdrains if required. Place clean, crushed, angular stone foundation 6" (150 mm) min. Compact to achieve a flat surface. Call StormTech at for technical and product information or visit 1

42 Manifold, Scour Fabric and Chamber Assembly Install manifolds and lay out woven scour geo textile at inlet rows [min ft (3.8 m)] at each inlet end cap. Place a continuous piece (no seams, double layer) along entire length of Isolator Row(s). Align the first chamber and end cap of each row with inlet pipes. Contractor may choose to postpone stone placement around end chambers and leave ends of rows open for easy inspection of chambers during the backfill process. Attaching the End Caps Prefabricated End Caps Isolator Row Construct the chamber bed by overlapping the chambers lengthwise in rows. Attach chambers by overlapping the end corrugation of one chamber on to the end corrugation of the last chamber in the row. Be sure that the chamber placement does not exceed the reach of the construction equipment used to place the stone. Lift the end of the chamber a few inches off the ground. With the curved face of the end cap facing outward, place the end cap into the chamber s end corrugation. 24" (600 mm) inlets are the maximum size that can fit into a SC-740/DC-780 end cap and must be prefabricated with a 24" (600 mm) pipe stub. SC-310 chambers with a 12" (300 mm) inlet pipe must use a prefabricated end cap with a 12" (300 mm) pipe stub. Drape a strip of ADS non-woven geotextile over the row of chambers (not required over DC-780). This is the same type of non-woven geotextile used as a separation layer around the angular stone of the 2 StormTech system.

43 Initial Anchoring of Chambers Embedment Stone Initial embedment shall be spotted along the centerline of the chamber evenly anchoring the lower portion of the chamber. This is best accomplished with a stone conveyor or excavator reaching along the row. No equipment shall be operated on the bed at this stage of the installation. Excavators must be located off the bed. Dump trucks shall not dump stone directly on to the bed. Dozers or loaders are not allowed on the bed at this time. Backfill of Chambers Embedment Stone 12" (300 mm) MAX. UNEVEN BACKFILL EVEN BACKFILL PERIMETER NOT BACKFILLED PERIMETER FULLY BACKFILLED Backfill chambers evenly. Stone column height should never differ by more than 12 (300 mm) between adjacent chamber rows or between chamber rows and perimeter. Perimeter stone must be brought up evenly with chamber rows. Perimeter must be fully backfilled, with stone extended horizontally to the excavation wall. Call StormTech at for technical and product information or visit 3

44 Backfill of Chambers Embedment Stone and Cover Stone Continue evenly backfilling between rows and around perimeter until embedment stone reaches tops of chambers. Perimeter stone must extend horizontally to the excavation wall for both straight or sloped sidewalls. Only after chambers have been backfilled to top of chamber and with a minimum 6" (150 mm) of cover stone on top of chambers can small dozers be used over the chambers for backfilling remaining cover stone. Final Backfill of Chambers Fill Material Small dozers and skid loaders may be used to finish grading stone backfill in accordance with ground pressure limits in Table 2. They must push material parallel to rows only. Never push perpendicular to rows. StormTech recommends that the contractor inspect chambers before placing final backfill. Any chambers damaged by construction shall be removed & replaced. StormTech Isolator Row Detail Install non-woven geotextile over stone. Geotextile must overlap 24" (600 mm) min. where edges meet. Compact each lift of backfill as specified in the site design engineer s drawings. Roller travel parallel with rows. Call StormTech at for technical and product information or visit 4

45 Table 1 Acceptable Fill Materials Material Location Description AASHTO M43 Compaction/Density Designation 1 Requirement Figure 1 Inspection Port Detail D Final Fill: Fill Material for layer D starts from the top of the C layer to the bottom of flexible pavement or unpaved finished grade above. Note that the pavement subbase may be part of the D layer. C Initial Fill: Fill Material for layer C starts from the top of the embedment stone ( B layer) to 18" (450 mm) above the top of the chamber. Note that pavement subbase may be part of the C layer. B Embedment Stone: Embedment Stone surrounding chambers from the foundation stone to the C layer above. A Foundation Stone: Foundation Stone below the chambers from the subgrade up to the foot (bottom) of the chamber. Any soil/rock materials, native soils or per engineer's plans. Check plans for pavement subgrade requirements. Granular well-graded soil/aggregate mixtures, <35% fines or processed aggregate. Most pavement subbase materials can be used in lieu of this layer. Clean, crushed, angular stone nominal size distribution Clean, crushed, angular stone, nominal size distribution N/A Prepare per site design engineer s plans. Paved installations may have stringent material and preparation requirements. AASHTO M45 Begin compaction after min. 12" (300 mm) of material A-1, A-2-4, A-3 over the chambers is reached. Compact additional or layers in 6" (150 mm) max. lifts to a min. 95% Proctor AASHTO M43 1 density for well-graded material and 95% relative 3, 357, 4, 467, 5, 56, 57, 6, density for processed aggregate materials. Roller 67, 68, 7, 78, 8, 89, 9, 10 gross vehicle weight not to exceed 12,000 lbs (53 kn). Dynamic force not to exceed 20,000 lbs (89 kn) AASHTO M43 1 3, 357, 4, 467, 5, 56, 57 AASHTO M43 1 3, 357, 4, 467, 5, 56, 57 No compaction required. Place and compact in 6" (150 mm) lifts using two full coverages with a vibratory compactor. 2, 3 PLEASE NOTE: 1. The listed AASHTO designations are for gradations only. The stone must also be clean, crushed, angular. For example, a specification for #4 stone would state: clean, crushed, angular no. 4 (AASHTO M43) stone. 2. StormTech compaction requirements are met for A location materials when placed and compacted in 6 (150 mm) (max) lifts using two full coverages with a vibratory compactor. 3. Where infiltration surfaces may be comprised by compaction, for standard installations and standard design load conditions, a flat surface may be achieved by raking or dragging without compaction equipment. For special load designs, contact StormTech for compaction requirements. Figure 2 Fill Material Locations Call StormTech at for technical and product information or visit 5

46 NOTES: 1. 36" (900 mm) of stabilized cover materials over the chambers is required for full dump truck travel and dumping. 2. During paving operations, dump truck axle loads on 18 (450 mm) of cover may be necessary. Precautions should be taken to avoid rutting of the road base layer, to ensure that compaction requirements have been met, and that a minimum of 18 (450 mm) of cover exists over the chambers. Contact StormTech for additional guidance on allowable axle loads during paving. 3. Ground pressure for track dozers is the vehicle operating weight divided by total ground contact area for both tracks. Excavators will exert higher ground pressures based on loaded bucket weight and boom extension. 4. Mini-excavators (< 8,000lbs/3,628 kg) can be used with at least 12 (300 mm) of stone over the chambers and are limited by the maximum ground pressures in Table 2 based on a full bucket at maximum boom extension. 5. Storage of materials such as construction materials, equipment, spoils, etc. should not be located over the StormTech system. The use of equipment over the StormTech system not covered in Table 2 (ex. soil mixing equipment, cranes, etc) is limited. Please contact StormTech for more information. 6. Allowable track loads based on vehicle travel only. Excavators shall not operate on chamber beds until the total backfill reaches 3 feet (900 mm) over the entire bed. ADS Terms and Conditions of Sale are available on the ADS website, 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 # / Advanced Drainage Systems, Inc. Table 2 Maximum Allowable Construction Vehicle Loads 5 Maximum Allowable Wheel Loads Maximum Allowable Track Loads 6 Maximum Allowable Roller Loads Material Fill Depth Max Axle Load Max Wheel Load Track Max Ground Max Drum Weight Location over Chambers for Trucks for Loaders Width Pressure or Dynamic Force in. [mm] lbs [kn] lbs [kn] in. [mm] psf [kpa] lbs [kn] D Final Fill Material 36" [900] Compacted 38,000 [169] C Initial Fill Material 24" [600] Compacted 24" [600] Loose/Dumped 32,000 [142] 16,000 [71] 12" [305] 18" [457] 24" [610] 30" [762] 36" [914] 32,000 [142] 16,000 [71] 12" [305] 18" [457] 24" [610] 30" [762] 36" [914] 32,000 [142] 16,000 [71] 12" [305] 18" [457] 24" [610] 30" [762] 36" [914] 3420 [164] 2350 [113] 1850 [89] 1510 [72] 1310 [63] 2480 [119] 1770 [85] 1430 [68] 1210 [58] 1070 [51] 2245 [107] 1625 [78] 1325 [63] 1135 [54] 1010 [48] 2010 [96] 1480 [71] 1220 [58] 1060 [51] 950 [45] 1540 [74] 1190 [57] 1010 [48] 910 [43] 840 [40] 20,000 [89] 20,000 [89] Roller gross vehicle weight not to exceed 12,000 lbs. [53 kn] 18" [450] 32,000 [142] 16,000 [71] 12" [305] 18" [457] 24" [610] 30" [762] 36" [914] B Embedment 12" [300] 16,000 [71] NOT ALLOWED 12" [305] Stone 18" [457] 24" [610] 30" [762] 36" [914] 6" [150] 8,000 [35] NOT ALLOWED 12" [305] 1070 [51] NOT ALLOWED 18" [457] 900 [43] 24" [610] 800 [38] 30" [762] 760 [36] 36" [914] 720 [34] Table 3 Placement Methods and Descriptions Material Placement Wheel Load Track Load Roller Load Location Methods/ Restrictions Restrictions Restrictions Restrictions See Table 2 for Maximum Construction Loads D Final Fill Material C Initial Fill Material B Embedment Stone A Foundation Stone A variety of placement methods may be used. All construction loads must not exceed the maximum limits in Table 2. Excavator positioned off bed recommended. Small excavator allowed over chambers. Small dozer allowed. No equipment allowed on bare chambers. Use excavator or stone conveyor positioned off bed or on foundation stone to evenly fill around all chambers to at least the top of chambers. 36" (900 mm) minimum cover required for dump trucks to dump over chambers. Asphalt can be dumped into paver when compacted pavement subbase reaches 18" (450 mm) above top of chambers. No wheel loads allowed. Material must be placed outside the limits of the chamber bed. Dozers to push parallel to rows until 36" (900mm) compaced cover is reached. 4 Small LGP track dozers & skid loaders allowed to grade cover stone with at least 6" (150 mm) stone under tracks at all times. Equipment must push parallel to rows at all times. No tracked equipment is allowed on chambers until a min. 6" (150 mm) cover stone is in place. 20,000 [89] Roller gross vehicle weight not to exceed 12,000 lbs. [53 kn] 20,000 [89] Roller gross vehicle weight not to exceed 12,000 lbs. [53 kn] Roller travel parallel to rows only until 36 (900 mm) compacted cover is reached. Use dynamic force of roller only after compacted fill depth reaches 12" (300 mm) over chambers. Roller travel parallel to chamber rows only. No rollers allowed. No StormTech restrictions. Contractor responsible for any conditions or requirements by others relative to subgrade bearing capacity, dewatering or protection of subgrade. Call StormTech at for technical and product information or visit 6