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4 RELEASE VERIFICATION <br /> Based on the information reported in the boring logs during installation, both of these probes <br /> (PGP-1 and PGP-2) appear to be in contact with landfill debris (e.g. wood pieces, angular <br /> gravel, and other debris), as previously described. <br /> To collect the appropriate data needed to evaluate if landfill gas is migrating offsite, the <br /> following activities are proposed: <br /> • Install new, landfill adjacent gas probes in non-fill material; <br /> • Develop, purge, and collect field samples from the landfill gas probes; <br /> • Increase the frequency of landfill gas monitoring activities; and <br /> • Conduct data evaluation. <br /> Further details regarding these activities are provided in the following subsections. <br /> 4.1 PREFIELD ACTIVITIES <br /> Prior to conducting field activities, Miller Brooks will contact Underground Service Alert to locate <br /> and identify underground lines (gas, water, fiber optic, etc) on the Site. In addition, a <br /> geophysical survey will be conducted to further identify any potential subsurface interference(s) <br /> to drilling. On behalf of Cove Contractors, Miller Brooks will obtain the necessary permits or <br /> authorizations from San Joaquin County Department of Environmental Health, Army Corp of <br /> Engineers, Central Valley Flood Protection Board, and from the City of Stockton prior to <br /> conducting the landfill gas probe installations. Copies of permits will be provided to the CIWMB <br /> after this Corrective Action Plan has been approved. <br /> 4.2 LANDFILL GAS PROBE FIELD ACTIVITIES <br /> 4.2.1 INSTALLATION <br /> Two perimeter gas probes will be installed outside the boundary of the landfill to further evaluate <br /> potential offsite methane migration at the site. As mentioned previously, one probe will be <br /> located west of PGP-1 and one will be located south of PGP-2 and will be identified as PGP-1 A <br /> and PGP-2A, respectively (see Figure 3). <br /> The target depth for gas monitoring probe installation will be based on the 35 ft maximum depth <br /> of waste. Each well will consist of an 8-inch diameter pilot boring that will be triple completed. <br /> Three gas probes within each well will be constructed of 0.75-inch diameter PVC piping that will <br /> 7 A!MLEN MWOIOKS <br /> ilinc. <br /> P:\707 Cove Contractors\Feasibility Study and Corrective Action Plan\Corrective Action Plan_Final.doc <br />