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�V �`■ KLEINFELDER <br /> L <br /> i <br /> 5 .CONCLUSIONS AND RECOMMENDATIONS <br /> San Joaquin County is attempting to abandon the underground diesel storage tank in place. <br /> Kleinfelder was retained to collect soil samples from five borings drilled adjacent to the tank to <br /> assess the soil. <br /> 1 <br /> Petroleum hydrocarbons were not detected in the soil borings on the northwest, north, east and <br /> j southeast sides of the tank. Elevated TPH as diesel concentrations (740 and 690 mg/kg) were <br /> detected in two samples from boring B-5 drilled near the southwest corner of the tank. <br /> Concentrations of TPH as gasoline (97 and 35 mg/kg) were also detected in these samples. <br /> Based on the analytical results, the soil near the southwest corner of the tank has been affected <br /> i <br /> with petroleum hydrocarbons. The source of the petroleum hydrocarbons have not been <br /> confirmed, but .the tank is the apparent source. The lateral and vertical extent of TPH <br /> migration near the southwest comer of the tank have not been assessed. <br /> Kleinfelder recommends a copy of this report be submitted to the San Joaquin County Public <br /> 5. <br /> Health Services, Division of Environmental Health for their review. This report is subject to <br /> F the limitations presented in Chapter 6. <br /> 1 <br /> } <br /> t <br /> r <br /> i <br /> x <br /> F <br /> j i P <br /> I <br /> f <br /> _. FR8-92-211 Page 7 of 8 24-220191-A00 <br /> Copyright 1992 Kleinfelder, Inc. <br />