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a <br /> Ono <br /> j XLEINFELDER <br /> F� <br /> I EKECU'l'IVE 5Ut' I RY <br /> �a <br /> i <br /> I <br /> A preliminary investigation has been completed to assess the presence of <br /> , r hydrocarbons in the upper. vadose zone sail of Unocal. Service Station §2859 <br /> located at the corner of Pacific Avenue and Walnut Street, in Stockton, <br /> . field <br /> California. The soil sampling program included five borings <br /> screening with a PID, and ten confirmatory samples chemically analyzed for <br /> total petroleum hydrocarbons and volatile aromatics by a certified <br /> laboratory. <br /> Petroleum hydrocarbons including benzene were detected at moderate levels s <br /> in soil samples collected at approximately Zo feet deep in two borings <br /> located to the northwest and southeast o£ the pump islands. Lower levels <br /> of hydrocarbons were detected in other borings and at other depths. The Y <br /> vertical extent of hydrocarbon migration may extend into ground water. <br /> The horizontal extent of contamination was not fully determined from this <br /> limited, preliminary investigation. <br /> The installation of ground water monitoring <br /> wells is recommended to <br /> l sampling is also recommended to <br /> evaluate water quality. Additional soi <br /> more fully evaluate the horizontal extent of sail contamination. Soil <br /> �. remediation will probably be required at this site. A feasibility study <br /> of remedial Options should be performed. <br /> - II <br /> 85-85-219 <br /> 1 <br />