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: . <br /> ,r <br /> ' 1 <br /> 7 FJ o.8.s. - stocktbn Plating Inc. <br /> October 10, 1991 <br /> Page -2- <br /> the request of Keith Tallia, Oil Equipment Service, San Andreas, <br /> California. <br /> b i ; <br /> 2.0 HISTORY <br /> t <br /> On P;agust 14, 1986, one 1,000-gallon underground leaded <br /> gasoline storage tank (TK1-3G) was removed from SPI by the <br /> r <br /> i <br /> American Environmental Management Corporation (AEMC), of Rancho <br /> Cordova, California. AEMC reported the tank was in good <br /> condition with no apparent holes or stress fractures. <br /> Approximately 12 cubic yards of sail were excavated during the <br /> -+ tank removal.. The soils appeared to have no discoloration or <br /> ! [ <br /> petroleum odor. One sail sample (SP-1) was collected by AEMC <br /> ..r <br /> from the center .of the excavation floor, beneath the former tank <br /> location. <br /> 4 <br /> Laboratory analyses of SP-1, reported by AEMC, indicated <br /> that diesel and motor oil were detected at 42 mg/kg and 610 <br /> !� mg/kg, respectively. Total lead was detected. at 150.3 mg/kg. <br /> t AE14C concluded that except for the relatively high total lead <br /> concentration, the analytical results do not indicate evidence of <br /> gasoline contamination. <br /> -� On August 25, 1986, at the direction of the San Joaquin <br /> County Environmental Health Department, AEMC removed an <br /> '" . additional S cubic yards of soil from the excavation in an effort <br /> _to--remove-the-motor-.0i1,_-diesel-..and--lead_contamination. AEMC -- <br /> t L <br /> CONDON <br /> .:cc! ..u...... <br />