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r <br /> 14 <br /> Site History <br /> 14000 Highway 88, Lockeford, CA <br /> Time Oil Property No 04-049 <br /> and W6 contained trace to "non-detect" concentrations of contaminants None of <br /> the samples collected from depths of 40 feet to 45 feet contained detectable <br /> concentrations of gasoline or its constituents <br /> After the installation of the wells, a vapor extraction pilot test was performed <br /> on Wl, W2, and W3 to evaluate the feasibility of in-situ remediation by vapor <br /> extraction The results of the study indicate that soil vapors can be easily <br /> extracted from the existing wells and that vapor extraction appears to be <br /> appropriate for site remediation <br /> Based on the results of the site investigation, it appeared that impacted soils <br /> were limited to the former tank excavation and the more dense soils encountered <br /> at a depth of 30 feet Although SB4, W4, W5 , and W6 generally defined the extent <br /> of soil contamination and data could be extrapolated to show that contamination <br /> was limited to the area of the former tank bed, it appeared that an additional <br /> boring was needed to verify that impacted soils were not present to the northeast <br /> beneath the pump islands <br /> A copy of Canonie's "Site Assessment Report" was forwarded to the appropriate <br /> regulatory agencies on May 25, 1993 In their reply dated June 18, 1993, the <br /> PHS/EHD requested that a workplan for an additional investigation be submitted <br /> WorkRlan for Additional Site Activities - October 1993 <br /> . A copy of Science and Engineering Analysis Corporation's (SEACOR) "Workplan, <br /> Additional Environmental Investigation" was forwarded to the appropriate <br /> regulatory agencies on October 20, 1993 The goal of the proposed investigation <br /> was to completely define the lateral extent of impacted soils at the subject <br /> site Site assessment activities proposed to meet the project goals included <br /> I Advancing 4 borings to a depth of 40 feet (or to 10 feet past any <br /> indications of contamination) <br /> 2 Collecting soil samples from each boring at 5-foot intervals and <br /> submitting them for analyses based on visual observation and field <br /> instrumentation readings <br /> 3 The installation of two 2-inch diameter vapor extraction inlet wells use <br /> in a future remediation system <br /> Authorization to proceed with the site assessment was received from the PHS/EHD <br /> on November 26, 1993 <br /> 3 <br />