9212 HOLLY DR 2018-01-02 MF Import

I I 1 1 I H I i Basic Function The StormFilter is designed to siphon stormwater runoff through a filter cartridge containing media. A variety of filter media is available and can be customized for each site to target and remove the desired levels of sediments, dissolved pho^nhorus, dissolved metals, organics, and and grease. In many cases, a combin,.don of media is recommended to maximize the effectiveness of the stormwater pollutant removal. Figure 1. The StormFilter Cartridge Priming System Function When stormwater in the StormFilter unit enters a StormFilter cartridge, it percolates horizontally through the cartridge's filter media and collects in the center tube of the cartridge, where the float in the cartridge is in a closed (downward) position. Water continues to pass through the filter media and into the cartridge's center tube. The air in the cartridge is displaced by the water and purged from beneath the filter hood through the one-way check valve located in the cap. Once the center tube is filled with water (approximately 18 inches deep), there is enough buoyant force on the float to open the float valve and allow the treated water in the center tube to flow into the under -drain manifold. This causes the check valve to close, initiating a siphon that draws polluted water throughout the full surface area and volume of the filter. Thus, the entire filter cartridge is used to filter water throughout the duration of the storm, regardless of the water surface elevatiun in the unit. This siphon continues until the water surface elevation drops to the elevation of the hood's scrubbing regulators. The cartridges are connected to the under - drain manifold with a plastic connector. Since some media used is potentially buoyant, a threaded connector affixed to the under -drain manifold (with glue or other adhesive) is necessary to ensure that the cartridge isn't lifted out of place. For the heavier compost media, a slip connector is used. The StormFilter is also equipped with flow spreaders that trap floating debris and surface films, even during overflow conditions. Depending on individual site characteristics, some systems are equipped with high and/or base flow bypasses. High flow bypasses are installed when the calculated peak storm event generates a flow that overcomes the overflow capacity of the system. This is especially important for precast systems. Base flow bypasses are sometimes installed to bypass continuous inflows caused by ground water seepage, which usually do not require treatment. All StormFilter units are designed with an overflow. The overflow operates when the inflow rate is greater than the treatment capacity of the filter cartridges. C2006 CONTECH Slormwater Solutions Toll -free: 800.548.4667 2 of 9 ' contechstomnvateccom Vault, CIP and Linear StormFilter operation and Maintenance Guidelines