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initiated and was in operation during early 1992. The PHS/EHD requested that the in situ <br /> treatment program be discontinued. <br /> T & T Earth Services was retained to conduct soil sampling of the stockpiled soils and in the <br /> vicinity of the tank excavation pit. This testing was performed during July, 1992 to evaluate <br /> the diesel concentrations in both the stockpile and around the excavation. Four samples were <br /> collected from the stock pile for analyses for TPH as gasoline and diesel and for BTEX. <br /> Four soil borings were drilled and sampled in the vicinity of the tank excavation pit. Twelve <br /> soil samples were analyzed for TPH as gasoline and diesel, BTEX and EDB. Test results <br /> showed that diesel impacted soils were still present above agency designated action levels of <br /> 100 mg/kg as diesel in the stockpile and in the soils surrounding the excavation pit. Two <br /> supplemental soil borings were drilled and sampled in an effort to lower the sample analysis <br /> detection limits. <br /> This testing confirmed the presence of TPH as diesel in the shallow soils around the diesel <br /> tank underground storage tank area. <br /> 3.0 WORK PLAN <br /> 3.1 Confirmation Soil Sampling <br /> Collect one soil sample from each sidewall and two soil samples from the Pit bottom to <br /> evaluate current soil quality conditions. Samples will be analyzed for TPH as gasoline and <br /> diesel, and BTEX using Methods modified 8015 and 8020, or equivalent. Samples will be <br /> collected using a backhoe, with samples placed into bras sampling tubes and sealed with <br /> teflon sheets and plastic caps. Park will make every effort to collect samples from the <br /> bucket to minimize the potential for the loss of volatiles. As the TPH has been identified as <br /> diesel, this should not present a problem. <br /> Sample locations will be selected in the field. SJC/EHD will be notified at least 48 hours <br /> prior to conducting the sampling and the locations and depths selected will be agreed to by <br /> the client and the agencies. <br /> 3.2 Utility Survey <br /> Prior to conducting any further subsurface site excavation, an on-site utilities location survey <br /> will be conducted. Park understands that there is at least one natural gas underground pipe <br /> along the east tank excavation wall. <br /> 3.3 Geotechnical Evaluation <br /> Should confirmation sample analytical results indicate that further pit remediation is <br /> necessary, the geotechnical evaluation will be initiated . This will consist of having a licensed <br /> geotechnical engineer review the existing boring log information. If the present data <br /> 500311 3 <br />