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I� Site Closure Report <br /> March 27, 1992 <br /> } _ Page _ 2_ <br /> 1 2 .0 HISTORY <br /> On June .4, 1991, one 1,000--gallon underground gasoline <br /> storage tank was removed from the East Ada Avenue site by -Jim <br /> Thorpe Oil Inc. , of Lodi, California (Appendix A, Figure 2) . The <br /> available records indicated that .the tank' was removed from the } <br /> site and_disposed of properly.' <br /> - I <br /> A soil sample collected from beneath the west end of the <br />{ tank contained 31,400 mg/kg total petroleum hydrocarbons - <br /> gasoline (TPH-G) . Benzene was detected at°1150 mg/kg. The soil t <br /> sample collected from beneath the east end of the tank contained <br /> i no petroleum hydrocarbons at the reported'ilaboratory detection <br /> limit. Due to the high concentrations of .gasoline residue <br /> detected in the sample taken beneath the west end of the former <br /> tank, further investigation was :necessarylto identify the limits <br /> of contamination (Site Contamination Workplan, 11273 East Ada <br /> Avenue, prepared by Condor Earth Technologies,-_Inc. , 10/9/91) . <br /> On January 8, 1992, two soil boringsl`(SB1 and SB2) were <br /> drilled near the west end of the locationlof the former tank k <br /> (Appendix A, Figure 2) . Condor geologists were on site to <br /> i <br /> supervise the drilling operation. SBI was drilled to a total <br /> depth of 40 feet and SB2 was drilled to ahtotal depth of 50 feet. <br /> Soil samples were collected at five foot intervals. No petroleum i <br /> odors or staining were noted in the soil samples or drill <br /> Ikk CONDOR 1 <br /> I <br />