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• 0 <br />Work Plan for Groundwater Investigation and <br />Groundwater Monitoring Well Installation <br />Field Maintenance Shop #24, Stockton, California <br />total lead. The sampling results associated with the newly installed monitoring wells are <br />included in the Treatability Study Report and Feasibility Evaluation for In-situ Petroleum <br />Hydrocarbon Remediation (OTIE, 2012b). <br />Following installation and development of the treatability study wells in early May, 2012, OTIE <br />conducted a treatability study to evaluate the feasibility of using SVE, AS, and HVDPE <br />technology to remediate the petroleum hydrocarbon plume. The treatability study, conducted <br />May 14 through May 18, 2012, included one day of SVE testing, two days of AS testing, and two <br />days of HVDPE testing. The key findings of this treatability study are summarized below: <br />• SVE effectively removed vapor -phase contamination from the vadose zone with a <br />calculated radius of influence of approximately 60 feet. <br />• AS significantly reduced groundwater concentrations after two days of testing at wells <br />FMS-AS1A and FMS-AS1 B. Soil vapor concentrations increased significantly over the <br />course of testing, indicating that contaminants were being effectively transferred from <br />groundwater to soil vapor. <br />• HVDPE effectively removed vapor -phase and dissolved -phase contamination. The soil <br />vapor radius of influence for HVDPE was calculated at approximately 100 feet. The <br />groundwater radius of influence was not calculated because drawdown was not <br />observed in the monitoring wells. <br />Detailed procedures and results of this testing are provided in the Treatability Study Report and <br />Feasibility Evaluation for In-situ Petroleum Hydrocarbon Remediation (OTIE, 2012b). <br />OTIE <br />