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IOperation <br /> IDescription <br /> The Stormwater Management StormFilter® (StormFilter) is a passive, flow-through, stormwater <br /> filtration system that is installed inline with storm drains. The system is comprised of one or more <br /> Ivaults that house rechargeable, media-filled, filter cartridges. The StormFilter works by passing <br /> stormwater through the media-filled cartridges, which trap particulates and adsorb materials such as <br /> dissolved metals and hydrocarbons. Once filtered through the media, the treated stormwater is <br /> Idirected to a collection pipe or discharged into an open channel drainage way. <br /> The StormFilter is offered in four different configurations: cast-in-place, precast, linear, and catch <br /> ' basin. The precast, linear, and catch basin models utilize pre-manufactured units to ease the design <br /> and installation processes. The cast-in-place units are customized for larger flows and may be either <br /> covered or uncovered underground units. <br /> IPurpose <br /> The StormFilter is a passive, flow-through, stormwater filtration system designed to improve the <br /> I quality of stormwater runoff from the urban environment before it enters receiving waterways. It is <br /> intended to function as a Best Management Practice (BMP)to meet federal, state, and local <br /> requirements for treating runoff in compliance with the Clean Water Act. <br /> IThrough independent third party studies, it has been demonstrated that the StormFilter is highly <br /> effective for treatment of first flush flows and for treatment of flow-paced flows during the latter part of <br /> a storm. In general, the StormFilter's efficiency is highest when pollutant concentrations are highest. <br /> I The primary non-point source pollutants targeted for removal by the StormFilter are: sediments <br /> (TSS), oil and grease, soluble metals, nutrients, organics, and trash and debris. <br /> ISizing <br /> The StormFilter is sized to treat the peak flow of a water quality design storm. The peak flow is <br /> I determined from calculations based on the contributing watershed hydrology and from a design storm <br /> magnitude set by the local stormwater management agency. The particular size of a StormFilter unit <br /> is determined by the number of filter cartridges (see Figure 1) required to treat this peak flow. <br /> The flow rate through each filter cartridge is adjustable, allowing control over the amount of contact <br /> time between the influent and the filter media. The maximum flow rate through each cartridge can be <br /> adjusted to between 5 and 15 gpm using a calibrated restrictor disc at the base of each filter cartridge. <br /> ' Adjustments to the cartridge flow rate will affect the number of cartridges required to treat the peak <br /> flow. <br /> Basic Function <br /> The StormFilter is designed to siphon stormwater runoff through a filter cartridge containing media. A <br /> variety of filter media is available and can be customized for each site to target and remove the <br /> desired levels of sediments, dissolved phosphorus, dissolved metals, organics, and oil and grease. In <br /> many cases, a combination of media is recommended to maximize the effectiveness of the <br /> stormwater pollutant removal. <br /> T 800.548.4667 F 800.561 .1271 W www.stormwaterinc.com 1 <br />