Prior-Approved List of Filtering Devices

In accordance with 9VAC25-870-65 D, the manufactured treatment devices (MTDs), also known as proprietary BMPs, listed on this page may NOT be used to meet the water quality design criteria in any stormwater management plan submitted on or after January 1, 2022.

These devices can be used to meet the total phosphorus (TP) water quality requirements of Virginia Stormwater Management Program (VSMP) regulation for plans submitted before January 1, 2022.* Under these circumstances, the assigned Event Mean Concentration (EMC) percent TP removal efficiency may be manually added into the Virginia Runoff Reduction Method (VRRM) spreadsheets to demonstrate water quality compliance.

*DEQ does not endorse any device and does not provide assistance with device selection.

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BACKGROUND

DEQ Evaluations

The devices listed here have not been approved under Guidance Memo No. 21-2006, which went into effect on December 29, 2021.

For each MTD listed on this page, the following information is provided:

    • DEQ approval letter
    • Web link to view specifications and other product information
    • Vendor contact information
    • Information reviewed by DEQ.

    If you have questions regarding an evaluation, please contact DEQ’s Robert Cooper, P.E., at Robert.Cooper@deq.virginia.gov or 804-698-4033.

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Sizing Information

To obtain the water quality credit assigned to a manufactured treatment device (MTD), the device must be properly sized. The MTD vendor and design professional are responsible for properly sizing a specific device for a given project.

DEQ recommends that designers and reviewers contact the MTD vendor for specific information regarding the type and size of device needed for each specific project.

To determine the MTD size needed for a project:

    1. Calculate the treatment volume to the device (TvBMP). The calculated TvBMP can be obtained from the Virginia Runoff Reduction Method (VRRM) spreadsheets.
    2. Calculate the peak discharge of the obtained treatment volume (qpTv). DEQ’s preferred method to calculate the peak discharge for a BMP drainage area is described here.
    3. Work with the MTD vendor to ensure that the obtained peak discharge to the device (qpTv) is less than or equal to the maximum treatment flow rate (MTFR) of the device (qpTv < MTFR).

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FILTERING DEVICES AWARDED 50% TP REMOVAL EFFICIENCY

(listed alphabetically)
BayFilterTM Stormwater Cartridge System
Letter from DEQ (April 20, 2022) stating that device (as named here) is included on this prior-approved list. The device (as named here) is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. See Practice 17 for device referenced in the letter with current approval.

Approval letter from DEQ (August 28, 2014) for use with stormwater management plans submitted between August 28, 2014 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.adspipe.com/.

Contact Information: Advanced Drainage Systems, Inc.
Jim Clark, P.E.
12347 Indigo Springs Court
Bristow, VA 20136
Phone: 240-463-0124
E-mail: james.clark@adspipe.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Jim Clark and use the following Web address:
    https://www.adspipe.com/.)
  • Item 3: MDE Letter
  • Item 4: NJDEP Certification Letters
  • Item 5: Maintenance Document
  • Item 6: Efficiency Assessment at Richard Montgomery High School (RMHS)
  • Item 7: RMHS Project: Evaluation of MASWRC Sample Collection, Sample Analysis, and Data Analysis
  • Item 8: NJCAT Technology Verification Report
  • Item 9: Total Phosphorus Testing in Grandview
  • Item 10: WDOE Technical Evaluation Report (TER) for Grandview and Woodinville sites
  • Item 11: GULD from Washington Ecology (added 12/28/2021)

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BioPodTM Biofilter System with StormMixTM Media
Letter from DEQ (April 20, 2022) stating that device (as named here) is included on this prior-approved list. The device (as named here) is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. See Practice 17 for device referenced in the letter with current approval.

Approval letter from DEQ (October 22, 2018; Appendix A: Certification letters from NJDEP and Washington State Department of Ecology) for use with stormwater management plans submitted between October 22, 2018 and December 31, 2021.

Specifications for the MTD are available from the website:
https://oldcastleinfrastructure.com/.

Contact Information: Oldcastle Infrastructure
Jay Holtz, P.E.
Director of Regulatory Management, Stormwater
5331 SW Macadam Ave, Suite 376
Portland, OR 97239
Mobile: 971-271-0796
E-mail: jay.holtz@oldcastle.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Jay Holtz and use the following Web address:
    https://oldcastleinfrastructure.com/.)
  • Item 2: Overview (Appendix A)
  • Item 3: Drawings (Appendix B)
  • Item 4: NJDEP Certification Letter & NJCAT Verification Report (Appendix C)
  • Item 5: GULD from Washington Ecology (Appendix D)
  • Item 6: Post-GULD Monitoring Report (Appendix E)
  • Item 7: Inspection and Maintenance Guide (Appendix F)
  • Item 8: Individual Storm Reports (Appendix G)
  • Item 9: Washington Ecology GULD (added 1/19/2022)

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FocalPoint High Performance Modular Biofiltration System (HPMBS)
Approval letter from DEQ (June 24, 2016) for use with stormwater management plans submitted between June 24, 2016 and December 31, 2021. See Practice 17 for current approval letter.

Specifications for the MTD are available from the website:
https://www.acfenvironmental.com/.

Contact Information: Ferguson Waterworks – Convergent Water Technologies, Inc.
For Project Specific Questions:
Rob Woodman, P.E.
Ferguson Waterworks
Phone: 207-272-4431
Email: rob.woodman@ferguson.com

For Technical Matters:
W. Scott Gorneau, P.E.
Convergent Water Technologies
13810 Hollister Drive, #100
Houston, TX 77086
Phone: 207-831-2795 or 1- 800-711-5428
Email: sgorneau@convergentwater.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration (Attachment 1)
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Use the contact information provided on this webpage.)
  • Item 3: TER through Appendix E (Attachment 2)
  • Continuation of TER, Appendix F
  • Continuation of TER, Appendices G-J
  • Item 4: Letter Re: TSS Laboratory Study (Attachment 3)
  • Item 5: Sil-Co-Sil 106 Fact Sheet (Attachment 4)
  • Item 6: Representative Maintenance Log (Attachment 5)
  • Item 7: Letter Re: Supplemental Water Quality Samples

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Perk Filter
Letter from DEQ (April 20, 2022) stating that device (as named here) is included on this prior-approved list. The device (as named here) is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. See Practice 17 for device referenced in the letter with current approval.

Approval letter from DEQ (September 4, 2014) for use with stormwater management plans submitted between September 4, 2014 and December 31, 2021.

Specifications for the MTD are available from the website:
https://oldcastleinfrastructure.com/.

Contact Information: Oldcastle Infrastructure
Jay Holtz, P.E.
Director of Regulatory Management, Stormwater
7000 Central Parkway, Suite 800
Atlanta, GA 30328
Mobile: 971-271-0796
Email: jay.holtz@oldcastle.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Use the contact information provided on this webpage.)
  • Item 2: WDOE GULD for Basic and Phosphorus Treatment
  • Item 3: Technical Evaluation Report (TER) [Volume 1]
  • Item 4: Operation and Maintenance Manual

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Silva Cell Suspended Pavement System with Bioretention (Silva Cell)
Letter from DEQ (April 20, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (December 19, 2017) for use with stormwater management plans submitted between December 19, 2017 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.deeproot.com.

Contact Information: DeepRoot Green Infrastructure, LLC
Shawn Freedberg
101 Montgomery Street, Suite 2850
San Francisco, CA 94104
Email: shawn@deeproot.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Use the contact information provided on this webpage.)
  • Item 2: Ecological Engineering Journal Article
  • Item 3: Project Plansheets: Wilmington, NC Study
  • Item 4: Approval Letters (City of Victoria, BC, Canada; Montgomery County, NY; St. Louis, MO Metropolitan Service District; WA State Department of Ecology; NC Department of Environmental Quality)
  • Item 5: List of projects in MD, VA, NC, and Washington DC
  • Item 6: Warranty
  • Item 7: Operations and Maintenance Manual
  • Item 8: UNC – “The Pit” Calculations
  • Item 9: NCDEQ Stormwater Design Manual (Section D-2)
  • Item 10: Stormwater Management Plan, C1-803. Charlottesville, VA
  • Item 11: Stormwater Management Compliance Calculations, C1-810. Charlottesville, Va. (try a different browser if information does not show)
  • Item 12: Excel Spreadsheet of Virginia Sizing Tool and Water Quality Data from Wilmington, NC Study

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FILTERING DEVICES AWARDED 45% TP REMOVAL EFFICIENCY

The Stormwater Management StormFilter® with ZPG media
Approval letter from DEQ (July 3, 2014).
Specifications for the MTD are available from the website:
https://www.conteches.com/.

Contact Information: Contech Engineered Solutions LLC
For Regulatory Matters:
Jacob Dorman
7037 Ridge Rd, Ste. 350
Hanover, MD 21076
Phone: 757-374-4321
Email: jacob.dorman@conteches.com

For Project Specific Questions:
Maryland Office
7037 Ridge Road, Suite 350
Hanover, MD 21076
Phone: 410-740-8490

Information reviewed by DEQ:
  • Item 1: MTD Registration
  • Item 2: Lake Stevens Study Report
  • Item 3: ETV Report
  • Item 4: Maintenance Fact Sheet
  • Item 5: Solutions Guide
  • Item 6: Washington Ecology GULD (added 12/31/2021)

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FILTERING DEVICES AWARDED 40% TP REMOVAL EFFICIENCY

(listed alphabetically)
StormTech® Isolator Row
Letter from DEQ (May 12, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (October 2, 2014) for use with stormwater management plans submitted between October 2, 2014 and December 31, 2021.

Information for the MTD is available from the website:
https://www.stormtech.com/ (ADS website:
https://www.adspipe.com).

Contact Information: StormTech, a division of Advanced Drainage Systems, Inc.
Greg Spires, PE
4640 Trueman Boulevard
Hilliard, OH 43026
Phone: 614-325-0032
E-mail: gregory.spires@adspipe.com

Information reviewed by DEQ:
  • Item 1:
    • Cover Sheet and Package Contents Page – page 1
    • MTD Registration – page 3
      (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Greg Spires.)
    • Product Catalog – page 14
    • O&M Manual – page 34
    • UNH Report – page 39
  • Item 2:
    • Tennessee Tech Report: Sediment Removal Efficiency (2006) – page 1
    • Tennessee Tech Report: Hydraulic Performance and Sediment Trap Efficiency (2005) – page 75
    • City of Charlotte Report (Cherry Gardens Study) – page 172
  • Item 3:
    • Approvals (Delaware DNREC; Prince William County, VA; Georgia; Metropolitan St. Louis Sewer District) – page 1
    • Project Profiles/Case Studies (Henrico County, VA; Fairfax, VA; Charles County, MD; Decatur, GA; SC State Fairgrounds; Winter Gardens, FL; Tram Depot, Edinburgh) – page 7
    • Various Media Reprints – page 17
  • Item 4: Letter to DEQ and Data from the City of Charlotte – Cherry Gardens Test Site
  • Item 5: Excel Spreadsheet of Sample Results

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StormVault BioFiltration (SVBF) with Sierra Blend Media
Letter from DEQ (April 20, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (March 9, 2021) for use with stormwater management plans submitted between March 9, 2021 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.jensenprecast.com/water-resources/.

Contact Information: Jensen Enterprises
Walter Stein
521 Dunn Cir.
Sparks, NV 89431
Phone: (775) 352-6336
Email: wstein@jensenprecast.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration
  • Item 3: NJCAT Technology Verification Report
  • Item 4: NJDEP Certification Letter
  • Item 5: WSDOE PULD for Basic Treatment using Sierra Blend
  • Item 6: Operation and Maintenance Manual
  • Item 7: Brochure

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Up-Flo Filter® with CPZ media
Letter from DEQ (April 20, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (August 13, 2014) for use with stormwater management plans submitted between August 13, 2014 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.hydro-int.com/en.

Contact Information: Hydro International
Phillip Taylor
94 Hutchins Dr
Portland, ME 04102
Mobile: 608-358-1194
Fax number: 207-756-6212
Email: ptaylor@hydro-int.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Address questions to Phillip Taylor.)
  • Item 3: NJDEP Certification Letter
  • Item 4: WSDOE CULD for Basic Treatment using CPZ Media
  • Item 5: Hydraulic Characterization of Various Filtration Media
  • Item 6: Performance Report for Removal of Sil-Co-Sil 106
  • Item 7: Sil-Co-Sil 106 Fact Sheet
  • Item 8: Operation and Maintenance Manual
  • Item 9: NJCAT Technology Verification Report
    (Note: A draft of the NJCAT technology verification report was originally submitted for Virginia DEQ review. The finalized version of the NJCAT technology verification report is provided here.)

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FILTERING DEVICES AWARDED 20% TP REMOVAL EFFICIENCY

(listed alphabetically)
R-Tank Module Treatment/Maintenance Row
Letter from DEQ (April 20, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (February 14, 2019) for use with stormwater management plans submitted between February 14, 2019 and December 31, 2021.

Specifications for the MTD are available from the website:
www.acfenvironmental.com.

Contact Information: Rainsmart Solutions
Corey Simonpietri
Mobile: 804-930-3130
E-mail: corey@rainsmartsolutions.com

Information reviewed by DEQ:
  • Item 1: Cover Letter
  • Item 2: MTD Registration (Attachment 1)
    (Note: The contact information for this device has changed since submission of the MTD Registration form. Use the contact information provided on this webpage.)
  • Item 3: 3rd Party Maintenance Row Performance Testing per ASTM C1746 (Attachment 2)
  • Item 4: Manufacturer’s Warranty (Attachment 3)
  • Item 5: Layout Details, Schematics and Photos (Attachment 4)
  • Item 6: Operation and Maintenance Manual (Attachment 5)

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StormTank Module Debris Row
Letter from DEQ (April 20, 2022) stating that device is not approved to meet VSMP water quality design criteria requirements for stormwater management plans submitted on or after January 1, 2022. Approval letter from DEQ (June 27, 2016) for use with stormwater management plans submitted between June 27, 2016 and December 31, 2021.

Specifications for the MTD are available from the website:
https://www.brentwoodindustries.com/.

Contact Information: Brentwood Industries
Dylan Faircloth
500 Spring Ridge Drive
Reading, PA 19610
Phone: 717-480-2122
E-mail: stormtank@brentwoodindustries.com

Information reviewed by DEQ:
  • Item 1: MTD Registration
  • Item 2: Hydraulic Performance and Sediment Removal Efficiency Report
  • Item 3: Certification Letter
  • Item 4: Design Guide
  • Item 5: Schematics
    (Note: The details have been updated. Please check with the manufacturer for the most current information.)

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