7405 HARDESON RD BASE FILE 2016-01-01 MF Import

is available and car be customized for each site to target and reinove the desired levels of sediments, dissolved phosphorus, dissolved metals, organics, and oil and grease. In many cases, a combination of media is recommended to maximize the effectiveness oi the stormwaler pollutant removal. Figure 1. The StormFilter Cartridge Priming System Function When stormwater in the StormFilter unil enlers a StormFiller cartridge, it percolales horizontally through the cartridge's fiiter media and collecls in the center tube oi 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 carlridge is displaced by the water and purged from benealh the filler 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 lhe float valve and allow the treated water in the center tube to flow into the under-drain manifold. This causes the check valve lo close, initiating a siphon tl�at draws pollut�d water throughout the (ull surtace area and volume of the filter. Thus, the entire filter cartridge is used to filter water throughout the duration oi the storm, regardless of the water surface elevation in the unit. This sipho� continue� 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 ylue or other adhesive) is necessary to ensure that the cartridge isn't lifted out of piace. For the heavier compost media, a slip connector is used. The StormFiiter is also equipped with `low spreaders that trap floaling debris and surface films, even durinq overflow conditions. Depending u�� individual site characteristics, som�: systems are equipped with high and/or base flow bypasses. High ilow bypasses are instailed when the calculated peak storm event generates a fiow that overcomes the over(low capacity of tlie system. This is especialiy 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 over(low. The overflow operates when the inflow rate is greater than the treatment capacity of the filter cartridges. S�orm�vater Alanagemenl, Inc. ��2004 StormFflter OperaHon and Maintenance Guidelines 2 of 9