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5.1.2.2 TREATMENT- CARBON FILTERS <br /> Description: Gas leaving the landfill through the passive system can be treated using activated <br /> carbon filters. The carbon filters remove organics,including volatile organic compounds (VOCs). <br /> Filters will be connected in-series between the high permeability collection device (well or <br /> trench) and the vent to the atmosphere. The filters will remove the VOCs from the landfill gas <br /> allowing the methane, a non-regulated gas, to be released into the atmosphere while <br /> simultaneously releasing the pressure from within the landfill. <br /> Short-term and Long-term Effectiveness: Effective immediately. Effective long term solution <br /> yielding permanent removal of contaminants from the site; spent carbon is transported to an <br /> offsite permitted regeneration facility where contaminants are removed from the carbon and <br /> destroyed. <br /> Implementabilitx: Fairly easy to implement as part of the treatment system. Modular <br /> component that are placed in series using quick-connect fittings. <br /> Cost: Low-Medium <br /> 5.1.3 ACTIVE GAS COLLECTION <br /> Description: Active systems restrict subsurface migration of landfill gas using mechanical means <br /> to alter pressure gradients and redirect subsurface gas flow. Recovery of landfill gas is only <br /> possible with an active system. A common active system construction consists of a group of <br /> extraction wells placed around the landfill at a lateral spacing of approximately 100 to 300 ft <br /> apart. An extraction vacuum withdraws the landfill gas, in the horizontal and vertical directions, <br /> from the wells and pushes the collected landfill gas through a free vent, waste-gas burner, or <br /> other applicable treatment technology. Because of the elevated methane concentrations, all <br /> equipment would be rated for use in potentially explosive atmospheres. <br /> Short-term and Long-term Effectiveness: There may be a short-term impact to workers drilling <br /> through the landfill. Effective for long-term collection of gas either directly through the landfill or <br /> through the subsurface adjacent to the landfill. With proper management, removes most risk <br /> from the landfill gas. <br /> Implementability: Fairly easy to implement as part of existing cap. <br /> Cost: Medium. <br /> 5.1.3.1 TREATMENT—CARBON FILTERS <br /> As stated in Section 5.1.2.2, activated carbon filters can also be used in combination with an <br /> active gas collection system to treat the landfill gas as it is being released. In a similar manner, <br /> as previously described, granular activated carbon canisters would be connected in series <br /> between the extraction system and the vent to atmosphere. <br /> 11 IMT M/LLER ONVOKAF <br /> iAw. <br /> P:\707 Cove Contractors\Feasibility Study and Corrective Action Plan\Corrective Action Plan_Final.doc <br />