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5 IDENTIFICATION AND SCREENING OF REMEDIAL <br /> TECHNOLOGIES <br /> This section includes an evaluation and comparison of the technical feasibility and estimated <br /> costs to implement each remedial technology. A more detailed cost estimate will be prepared <br /> once the preferred technologies are selected and preliminary designs completed. <br /> 5.1 LANDFILL GAS <br /> 5.1.1 NO ACTION <br /> "No Action" is carried forward for evaluation because it provides a baseline to which other <br /> remediation technologies and their associated process options can be compared. In general, <br /> No Action would not achieve the RAOs for the Site and has been eliminated from further <br /> consideration. <br /> 5.1.2 PASSIVE SYSTEM <br /> Description: Directs subsurface gas flow without using mechanical components to points of <br /> controlled release by utilizing high-permeability systems. High-permeability systems can include <br /> trenches or wells along the boundary of the landfill, excavated and subsequently backfilled <br /> using permeable material (e.g. gravel) to create the preferred path of gas flow. In comparison, <br /> low permeability layers block flow paths to outside area and may utilize clay or synthetic-lined <br /> trenches or walls. The only use of a passive system is to control, not recover, the release of gas <br /> to the atmosphere. <br /> Short-term and Lona-term Effectiveness: There may be a short-term impact to workers drilling <br /> through the landfill. Protects cap in short-term, however, it may impact the environment and <br /> community through release. Not as effective in controlling offsite migration in the long-term <br /> compared to an active system. Primarily protects cap from a buildup and directs gas to local <br /> well or trench. <br /> Implementability: Can be installed as part of an existing cap. <br /> Cost: Low. <br /> 5.1.2.1 TREATMENT— NO ACTION <br /> Description: A "No Action" treatment alternative relies completely on the passive system as a <br /> corrective action alternative. <br /> 10 M/LLER MWZWKS <br /> zinc, <br /> P:\707 Cove Contractors\Feasibility Study and Corrective Action Plan\Corrective Action Plan_Final.doc <br />