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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER SOURCE AREA TREATMENT DEVICE - STORMWATER MANAGEMENT INC., CATCH BASIN STORMFILTER®
Citation:
NSF INTERNATIONAL. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER SOURCE AREA TREATMENT DEVICE - STORMWATER MANAGEMENT INC., CATCH BASIN STORMFILTER®. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-05/138, 2005.
Impact/Purpose:
To inform the public
Description:
Verification testing of the Stormwater Management CatchBasin StormFilter® (CBSF) was conducted on a 0.16 acre drainage basin at the City of St. Clair Shores, Michigan Department of Public Works facility. The four-cartridge CBSF consists of a storm grate and filter chamber inlet bay, flow spreader, cartridge bay, overflow baffle, and outlet bay, housed in a 10.25 ft by 2 ft steel vault. The four-cartridge CBSF is designed to treat stormwater with a maximum flow rate of 60 gpm. Flows greater than the maximum flow rate would pass the overflow baffle to the discharge pipe, bypassing the filter media. The verification challenge included collecting influent and treated effluent samples during 16 qualified storm events. A qualified storm event was defined as a minimum of 0.2 in. of rainfall, where representative sample aliquots are collected throughout the duration of the event and composited into a flow-weighted composite sample. The influent and effluent sampling areas were equipped with automated samplers and flow monitoring devices to collect and monitor the flows entering and exiting the system. The sediment loadings in this drainage basin exceeded a concentration and mass loading range in which a valid measure of the removal performance of the CBSF could be conducted. According to the vendor, the four-cartridge CBSF has a maximum sediment storage capacity of 27 ft3 or 200 gal in the sump, plus a maximum of 100 lb in the cartridges (25 lb per cartridge). The influent calculated SOL mass for TSS and SSC was approximately 2,000 lb for all events. Based on SOL calculations, the sediment loadings for qualified events likely exceeded the CBSF sediment capacity after only a few events. The verification testing concluded that the system was capable of removing approximately 11% of sediment as determined by the total suspended solids (TSS) and approximately 9.2% of sediment as determined by suspended sediment concentration (SSC) analytical procedure. In spite of the excessive sediment loadings, the sediment SOL data were further evaluated to assess the performance impacts of maintenance activities and events where bypass did not occur. This data indicated a 34% TSS SOL reduction for the first three events following maintenance, as compared to a 3.1% reduction for all other events. Furthermore, the data indicated a 40% SSC SOL reduction for events where bypass did not occur, compared to a 1.5% reduction for events where bypass occurred. The CBSF also removed total metals and hydrocarbons from stormwater. The CBSF was cleaned and equipped with new filter cartridges prior to the start of verification and in the spring of 2004, before verification resumed after winter demobilization, and at the end of verification. The CBSF vaults are easily accessible from the ground surface, which makes cartridge replacement and sediment removal easy. According to the vendor, spent filter cartridges weigh approximately 250 lb each, and if mishandled can cause damage to the PVC under-drain manifold in the vault.
URLs/Downloads:
ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER SOURCE AREA TREATMENT DEVICE - STORMWATER MANAGEMENT INC., CATCH BASIN STORMFILTER®VERIFICATION STATEMENT