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General Response Table 1. (Continued) <br /> Action Remedial Technologies Process Options Description Evaluation Comments <br /> Collection Passive Gas Removal Trench Vents Constructed by excavating a deep, Potentially viable. <br /> (continued) narrow trench between the methane <br /> generating waste mass and the <br /> property boundary.The trench is <br /> backfilled with gravel,forming a • <br /> path of least resistance for the <br /> methane gas to release to the <br /> atmosphere.Trenches are most <br /> successfully used where the depth <br /> of LFG migration is limited by <br /> groundwater or an impervious <br /> formation. <br /> Active Systems Extraction Wells or Applied extraction vacuum will Potentially viable. <br /> Trenches serve to withdraw LFG in both the <br /> horizontal and vertical directions. <br /> Wells(vertical extraction wells or <br /> horizontal extraction wells within a <br /> trench)are connected by a <br /> collection header,which leads to a <br /> blower/burner system or carbon <br /> canister unit. Vacuum blowers <br /> serve to extract the LFG from the • <br /> wells and push the collected gas <br /> through the treatments stem. <br /> Air Injection System Wells are constructed in the natural Potentially viable. Application of this <br /> soil between the landfill and the technology is site specific.Injection wells <br /> property boundary nearest the must be located a sufficient distance from <br /> threatened structures. A blower the landfill to prevent forcing air into the <br /> pumps air into the wells,creating a refuse. Spacing and depth of wells are <br /> pressurized zone which both also important. <br /> retards LFG flow and dilutes <br /> subsurface methane concentrations. <br /> K:\Wprocess\25532\WorldEnterprise\Remediation Plan\Table l.doc 2 <br />