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is justifiable given the remoteness of the landfill and absence of <br /> surrounding residences. <br /> 3. The performance objective of the corrective action is to primarily stop <br /> increases in VOC concentrations in groundwater and secondarily to <br /> reduce VOC concentrations in groundwater over time. <br /> Corrective action taken to mitigate the hypothetical release scenario will include <br /> the following activities: <br /> 1. A series of 15, deep vent wells (placed on 300 foot centers) designed to <br /> influence the deep waste and underlying vadose zone, will be installed in <br /> the interior of the landfill. <br /> 2. The depth of the wells will reach to the soil/waste interface (total well <br /> length of 30 feet) and the wells will have short screens. <br /> 3. Each wellhead will be fitted with a one-way valve and wind turbine that, <br /> when spinning, will apply a slight vacuum to the well. The one-way valve <br /> will prevent oxygen from entering the landfill. <br /> The network of vent wells will mitigate the migration of landfill gas from the <br /> bottom of the landfill. <br /> 4. COST ANALYSIS <br /> The cost of the corrective action plan includes engineering design, construction <br /> and associated materials, permitting, and the final report. A detailed break down <br /> of the associated cost for the project is shown in Table 1. Permitting associated <br /> with the project will include RWQCB and SJC well drilling permits. The total <br /> project cost was estimated at approximately $84,000. <br /> 73467 4 August 9,2006 <br /> LA 1103C Corrective Action Financial Assurance Cost Estimate <br /> Harney Lane Sanitary Landfill <br />