The attached pages include signed statements from the manufacturer (Advanced Drainage Systems, Inc.), the supervising third-party observer (Boggs Environmental Consultants, Inc.), and NJCAT. These statements are included as a requirement for the verification process.
28 March 18, 2020
Dr. Richard S. Magee, Sc.D., P.E., BCEE NJCAT
Center for Environmental Systems Stevens Institute of Technology Castle Point on Hudson
Hoboken, NJ 07030-0000
Advanced Drainage Systems is pleased to provide this letter as our statement certifying that the protocol, “New Jersey Department of Environmental Protection Laboratory Protocol to Assess Total Suspended Solids Removal by a Filtration Manufactured Treatment Device” (NJDEP Filter Protocol, January25, 2013),was strictly followed while testing our EcoPure BioFilterTM system. The testing was
performed at the BaySaver Laboratory, located in Mount Airy, MD. All data pertaining to the EcoPure BioFilterTM NJDEP Protocol test is included in the Verification Report.
Sincerely,
Daniel J Figola, PE
Director of Sustainability Development Advanced Drainage Systems, Inc.
31 Center for Environmental Systems
Stevens Institute of Technology One Castle Point
Hoboken, NJ 07030-0000
April1, 2020
Gabriel Mahon, Chief NJDEP
Bureau of Non-Point Pollution Control Bureau of Water Quality
401 E. State Street
Mail Code 401-02B, PO Box 420 Trenton, NJ 08625-0420
Dear Mr. Mahon,
Based on my review, evaluation and assessment of the testing conducted on the Advanced Drainage Systems EcoPure BioFilter™ (4’ x 8’ commercial system) at the BaySaver Laboratory (BaySaver Technologies, LLC is a subsidiary of Advanced Drainage Systems, Inc.), under the independent third-party oversight of Boggs Environmental Consultants (BEC), Inc., the test protocol requirements contained in the “New Jersey Department of Environmental Protection Laboratory Protocol to Assess Total Suspended Solids Removal by a Filtration Manufactured Treatment Device” (NJDEP Filter Protocol, January 2013) were met or exceeded. Specifically:
Test Sediment Feed
The test blend was custom-blended using various commercially available silica sands under the oversight of BEC. The particle size distribution was independently analyzed by Environmental Consulting Services (ECS), using the methodology of ASTM method D422-63.The blended silica met the specification within tolerance as described in Section 5B of the NJDEP filter protocol and was acceptable for use.
Removal Efficiency Testing
Twenty-six (26) removal efficiency testing runs were completed in accordance with the NJDEP filter protocol. Twenty-one (21) of the 26 test runs were conducted at the target flow rate of 60
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gpm and an influent sediment concentration of 200 mg/L. Maximum driving head of 36” was reached at Test Run 21 and the flow rate was reduced to 90% of the MTFR (54 gpm) for Test Runs 22-26 per the filter protocol. The EcoPure BioFilter™ demonstrated an average sediment removal efficiency on a cumulative mass basis of 88.0% over the course of the 26 test runs.
Sediment Mass Loading Capacity
Mass loading capacity testing was conducted concurrently with removal efficiency testing. The 4’ x 8’ EcoPure BioFilter™ has a mass loading capture capacity of 194.5 lbs (3.24 lbs/ft2 of filtration area).
No maintenance was performed on the test system during the entire testing program.
Scour Testing
The 4’ x 8’EcoPure BioFilter™ at 100% mass loading/capture capacity demonstrated minimal scour (2.0 mg/L adjusted effluent sediment concentration) at 111.2 gpm (185% of MTFR) qualifying it for on-line installation up to this flow rate.
Sincerely,
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VERIFICATION APPENDIX
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Introduction
• Manufacturer – Advanced Drainage Systems, Inc, 4640 Trueman Blvd, Hilliard, OH 43026 Website: https://www.ads-pipe.com Phone: 800-229-7283.
• MTD - EcoPure BioFilter™ verified models are shown in Table A-1. In the bio-media bed
• TSS Removal Rate – 80%
• On-line installation up to 185% MTFR Detailed Specification
• NJDEP sizing tables and physical dimensions of EcoPure BioFilter™ verified models are attached (Table A-1). These sizing tables are valid for NJ following NJDEP Water Quality Design Storm Event of 1.25" in 2 hours (NJAC 7:8-5.5(a)).
• Maximum inflow drainage area
o The maximum inflow drainage area is governed by the maximum treatment flow rate of each model as presented in Table A-1.
• Driving head will vary for a given EcoPure BioFilter™ model based on the site-specific configuration. The maximum head available until bypass is 36”, but the minimum head varies depending on the flow rate through the unit and the cumulative mass captured in the biofiltration cell over time. Design support is given by BaySaver for each project, and site- specific drawings (cut sheets) will be provided that show pipe inverts, finish surface elevation, and peak treatment and maximum flow rates through the unit.
• The drawdown flow exits via an effluent pipe at the bottom of the filter bed. A clean filter draws down in approximately 20 minutes. The pretreatment cell of the EcoPure BioFilterTM remains full of water after drawdown.
• See Advanced Drainage Systems EcoPure BioFilter™ Design Manual I & M Section for inspection and maintenance procedures at https://baysaver.com/resources/.
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Table A-1 EcoPure BioFilter
TMModel Sizes and New Jersey Treatment Capacities
Overall Unit (ft) Pre- treatment Cell (ft) Filter Bed (ft) Effective Filtration Treatment Area (EFTA) (ft2)1 Effective Sedimentation Treatment Area (ESTA) (ft2) ESTA/EFTA Wet Volume (WV) (ft3) WV/EFTA MTFR (cfs)2 Mass Capture Capacity (lbs) Drainage Area (acres)3 4 x 8 4 x 3 4 x 4.5 60 30 0.50 56 0.94 0.134 194.5 0.324 4 x 10 4 x 4 4 x 5.5 75 38 0.51 73 0.97 0.167 242.4 0.404 4 x 12 4 x 5 4 x 6.5 90 46 0.51 90 1.00 0.201 291.8 0.486 4 x 14 4 x 6 4 x 7.5 105 54 0.51 106 1.01 0.234 339.6 0.566 4 x 16 4 x 7 4 x 8.5 120 62 0.52 123 1.03 0.268 389.0 0.648 8 x 12 8 x 5 8 x 6.5 180 92 0.51 179 0.99 0.401 583.5 0.973 8 x 16 8 x 7 8 x 8.5 240 124 0.52 246 1.02 0.535 778.0 1.297 8 x 20 8 x 8.5 8 x 11 315 156 0.50 304 0.96 0.702 1021.1 1.702 8 x 24 8 x 10.5 8 x 13 375 188 0.50 371 0.99 0.836 1215.6 2.026
1. Effective Filtration Treatment Area (EFTA) is defined as the surface area of the ADS AdvanEDGE pipe that is available for flow from the bioretention filter media layer.
2. Based on 1 gpm/ft2 of effective filtration treatment area.
3. Drainage Area is based on Mass Capture Capacity (194.5/60 = 3.24 lbs/ft2 of filtration area) and the equation in the NJDEP Filter Protocol wherein