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_ _ _ <br /> MIER <br /> OW <br /> _ p_B-0_:. <br /> _ •=ice .a"-,€._ a ���'� <br /> rt � <br /> i <br /> I <br /> ! O.E.S. -Stockton Platin Iac. <br /> r �1 October 10, 1991 <br /> i <br /> P Page _Q_ <br /> jEric Trevena of the San Joaquin County Environmental Health <br /> Department was on site to observe the tank removal and samplLng <br /> procedures. The tank was in poor condition and extremely <br /> P corroded on the east end. A Bole, approximately 1 centimeter in <br /> a diametar, was located at the bottom east end of the tank. The <br /> native soil consisted of brown, clayey silt and was overlain by a - <br /> 2-foot layer of asphaltic fill/debris. A strong petroleum odor <br /> was noted in the brown, clayey silt beneath the tank. No <br /> groundwater was encountered in the excavation. <br /> Two soil samples were collected from beneath the former tank <br /> 1::4 <br /> site, one from each end. The two samples were analyzed for ben- <br /> zene, toluene, ethyl benzene, and xylene (BTEX) by EPA Method <br /> 8020, for total petroleum hydrocarbons-gasoline (TPH-G) by Method <br /> 5030/Mod.8015, for ethylene dibromide (EDB) by Method 504, and <br /> for tetraethyl lead (TEL) by Method DHS-LUFT. <br /> ' Gasoline and gasoline constituents (BTEX) were detected in <br /> the soil samples. Total petroleum hydrocarbons (TPH-G) were "•" <br /> F' detected at 3300 mg/kg, and 2800 mg/kg. Various concentrations <br /> of benzene, toluene, ethyl benzene, and xylene were detected in <br /> both samples. Tetraethyl lead (TEL) and ethyl dibromide <br /> y (EDB) <br /> I were not detected in the soil samples. <br /> — ::. -- ---- --- — --- -- ------ ----- ------------- -- - ---- -- - — <br /> 41 <br /> -Condor recommended that four soil borings be drilled around <br /> far <br /> the TK1-90 site to investigatethe vertical and horizontal 2 tent <br /> 3 CONDOR <br />