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rn <br /> a <br /> 10 <br /> iR "MW <br /> KIM <br /> July 8, 1988 AGS ,lob No. 38032-1 <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> r"A <br /> ANALYTICAL RESULTS <br /> The sampics collected were tested for total petroleum <br /> hydrocarbons by Environmental Protection Agency (EPA) method 8015 <br /> and the volatile hydrocarbon constituents benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) by EPA Method 8020. <br /> Samples from beneath each enol of the storage tanks were analyzed <br /> for total organic lead and ethylene dibromide using methods <br /> recommended by the California Department of Health Services. <br /> These analyses were requested by Mr. Harlin Knoll of the San <br /> Joaquin Local Health District. The analyses for total petroleum <br /> " `il% hydrocarbons and BTEX were performed at HAZCAT Mobile Organics <br /> Laboratory in San Carlos, California, and the analyses for total <br /> f organic lead and ethylene dibromide were performed at CHEMWEST <br /> Analytical Laboratories in Sacramento, California, Both <br /> laboratories are certified by the State of California for the <br /> tests requested. The results of these analyses are summarized in <br /> Tabic 3. <br /> In response to the contamination detected beneath the unCerground <br /> 40 storage tanks, the tank cavity was further excavated to the safe <br /> operating limits of the excavator. Soil was excavated to . <br /> approximately 17 feet below grade in the western half of the tank <br /> �..:� 10 <br /> APP11,ed 0490SY OMS <br />