Item 1: Cover Letter and Review Request.See prior-approved list of filtering devices for use with stormwater management plans submitted between Jand December 31, 2021.Ĭontact Information: Ferguson Waterworks For Project Specific Questions: See approval letter in section below (50% TP Removal) for use with stormwater management plans submitted between Februand February 16, 2023. + + + + + + + + + + + + + + + + + Filterra ® Bioscape TMĪpproval letter from DEQ (February 17, 2023) for TP pollutant removal efficiency of 60% for use with stormwater management plans submitted on or after February 17, 2023. Appendix M: Project Quality Assurance Project Plan. Appendix L: Laboratory Reports and Chain-of-Custody Records for Collected Water Quality Data.Appendix K: Individual Storm Reports for Sampled Storm Events.Appendix J: Field Data Sheets for Sampled Storm Events.Appendix I: Water Quality Data Assurance Memorandum.Appendix H: Water Quantity and Quality Database.Appendix G: Hydrologic Data Quality Assurance Memorandum.Appendix E: As-Built Drawings and Photographs of Test System.Appendix D: Installation, Operation, and Maintenance Manual.Appendix C: System Plant Selection List.Appendix B: Engineered Filter Media Specifications.Appendix A: System Schematics and Design Assistance Kit.Item 2: Washington Ecology GULD for Basic (TSS), Enhanced, Phosphorus & Oil.Item 1: Proprietary BMP Registration Statement.Specifications for the MTD are available from the website:Ĭontact Information: Contech Engineered Solutions LLC For Regulatory Matters: See approval letter in section below (50% TP Removal) for use with stormwater management plans submitted before April 15, 2022. Work with the MTD vendor to ensure that the obtained peak discharge to the device (q pTv) is less than or equal to the maximum treatment flow rate (MTFR) of the device (q pTv DEQ’s preferred method to calculate the peak discharge for a BMP drainage area is described here. Calculate the peak discharge of the obtained treatment volume (q pTv).The calculated Tv BMP can be obtained from the Virginia Runoff Reduction Method ( VRRM) spreadsheets. Calculate the treatment volume to the device (Tv BMP).To determine the MTD size needed for a project: The MTD vendor and design professional are responsible for properly sizing a specific device for a given project.ĭEQ 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 date, successful installs have occurred in most states on the east coast and in West Virginia.įabco’s Beehive Filter can be added to capture floatables and solids in any type of round bypass infrastructure.To obtain the water quality credit assigned to a manufactured treatment device (MTD), the device must be properly sized. We recommend reaching out to our team for state-specific installation information. Infiltration flow rates for the system’s standard media exceed 100″ per hour.ĭue to the small footprint, the system can be installed along the edge of a roadway behind curb lines, in landscaped stormwater basins and in urban green infrastructure streetscapes. The system removes pollutants from stormwater runoff through the physical, chemical and biological mechanisms of its soil, plant and microbe complex. FocalPoint’s reliable, high performance biofiltration enables reduced footprints, new application options and lower installation and maintenance costs.įocalPoint is an ultra-efficient, modular biofiltration system that treats and drains large volumes of stormwater runoff in a small footprint (up to 90% smaller than traditional bioretention systems) to meet post-construction stormwater treatment requirements. This advanced media technology provides high flow rates and best available pollutant removal rates for common stormwater pollutants and as an option can be modified for enhanced performance on certain targeted pollutants. FocalPoint High Flow Biofiltration System OverviewįocalPoint’s next generation high-flow biofiltration system is the key to its high performance.
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