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down investigation of the western, eastern, and southern boundaries of the site. The <br /> proposed investigation will include the following activities: <br /> • Installing three hydropunch groundwater zone sampling points and multi-level <br /> vadose zone sampling points to the west of the monitoring well MW-4. <br /> • Installing three hydropunch shallow groundwater zone sampling points and <br /> multi-level vadose zone sampling points to the east of the monitoring well <br /> MW-2. <br /> • Installing three hydropunch shallow groundwater zone sampling points multi- <br /> level vadose zone sampling points to the south of monitoring well MW-3. <br /> HYPOTHETICAL CORRECTIVE ACTION <br /> A corrective action response was developed to mitigate the impacts envisioned under the <br /> hypothetical release scenario. The extent and complexity of the corrective action <br /> response is proportional to the environment threat of the release and is consistent with the <br /> type and magnitude of corrective action mandated by the RWQCB at the time this <br /> document was prepared. <br /> The corrective action envisioned is based on the following assumptions and premises: <br /> • The focus of the corrective action is source control. <br /> • The low level release of VOCs to groundwater will not require active <br /> groundwater cleanup (pump and treat, air sparging, etc.). This approach is <br /> justifiable given the remoteness of the landfill and absence of surrounding <br /> residences. <br /> • The performance objective of the corrective action is primarily to stop increases <br /> in VOC concentrations in groundwater and secondarily to reduce VOC <br /> concentrations in groundwater over time. <br /> Corrective action taken to mitigate the hypothetical release scenario will include the <br /> following activities: <br /> • Install a ten additional LFG collection wells, placed in coordination with the <br /> existing wells. The new wells will be designed to collect from the soil beneath <br /> the landfill, the deep waste and underlying vadose zone. <br /> • The depth of the wells will reach to the soil beneath the landfill approximately <br /> 15 feet. The total depth of each well may be 100 feet, depending on the location <br /> of the well on the landfill. <br /> Corrective Acton Financial Assurance Cost Estimate 3 September 30,2008 <br /> Harney Lane Sanitary Landfill San Joaquin County Public Works Department <br />