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% N i IA ir ! Operation and Maintenance STORMWATER SOLUTIONS The Stormwater requirements for treating runoff in compliance with the Clean Water Act. Management StormFilter° Through independent third party studies, it Vault, Cast-In-Place, and Linear Units has been demonstrated that the StormFilter is highly effective for treatment of first flush flows and for treatment of flow-paced flows Important: These guidelines should be used during the latter part of a storm. In general, as a part of your site stormwater the StormFilter's efficiency is highest when management plan. pollutant concentrations are highest. The primary non-point source pollutants targeted Description for removal by the StormFilter are: The Stormwater Management StormFilter® suspended solids (TSS), oil and grease, (StormFilter) is a passive, flow-through, soluble metals, nutrients, organics, and stormwater filtration system. The system is trash and debris. comprised of one or more vaults that house rechargeable, media-filled, filter cartridges. Sizing The StormFilter works by passing The StormFilter is sized to treat the peak stormwater through the media-filled flow of a water quality design storm. The cartridges, which trap particulates and peak flow is determined from calculations adsorb materials such as dissolved metals based on the contributing watershed and hydrocarbons. Once filtered through the hydrology and from a design storm media, the treated stormwater is directed to magnitude set by the local stormwater a collection pipe or discharged into an open management agency. The particular size of channel drainage way. a StormFilter unit is determined by the number of filter cartridges (see Figure 1) The StormFilter is offered in multiple required to treat this peak flow. configurations, including vault, linear, catch basin, manhole, and cast-in-place. The The flow rate through each filter cartridge is vault, linear, manhole, and catch basin adjustable, allowing control over the amount models utilize pre-manufactured units to of contact time between the influent and the ease the design and installation processes. filter media. The maximum flow rate The cast-in-place units are customized for through each cartridge can be adjusted to larger flows and may be either covered or between 5 and 15 gpm using a calibrated uncovered underground units. restrictor disc at the base of each filter cartridge. Adjustments to the cartridge flow Purpose rate will affect the number of cartridges The StormFilter is a passive, flow-through, required to treat the peak flow. stormwater filtration system designed to improve the quality of stormwater runoff from the urban environment before it enters receiving waterways. It is intended to function as a Best Management Practice (BMP) to meet federal, state, and local ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 1 of 9 contechstormwater.com Vault,CIP and Linear StormFilter Operation and Maintenance Guidelines