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f <br /> .s <br /> `�' J Nf11�1CI��rfR1YfA <br /> Mr. Charles Leubner <br /> 30 January 1991 <br /> Page 3 <br /> gallon diesel tank. These samples were collected at approximately 20-foot intervals along <br /> the length of the piping. <br /> One sample was collected for analyses from the 500-gallon gasoline tank. This sample was <br /> collected from the approximate center of the Excavation, at a depth of approximately two <br /> feet into the native soil beneath the former R cation of the tank bottom. <br /> LABORATORY ANALYSIS <br /> The analytical program for the sail samples consisted of the following analyses, as specified <br /> by Letitia Resch of the San Joaquin County Public Health Services, Environmental Health <br /> Division included: <br /> 10,000-Gallon Diesel Tank and Remote Fill Line: <br /> Analysis Method <br /> Total Petroleum Hydrocarbons as Diesel GC-FID with soxhlet sample <br /> preparation <br /> Benzene, Toluene, Ethylbenzene and EPA Method 8020 <br /> Xylenes <br /> 500-Gallon Gasoline Tank: <br /> Analysis Method <br /> Total Petroleum Hydrocarbons as Gaso ine GC-FID with purge and trap sample <br /> preparation <br /> Benzene, Toluene, Ethyibenzene and EPA Method 8020 <br /> Xylenes <br /> Ethylene dibromide (EDB) DOHS-AB 1803 <br /> Lead Waste Extraction Test (WET) <br /> At the same time that a sample was colleted for laboratory analysis, a sample was <br /> collected from the backhoe bucket to monito for the presence of-organic vapors. The <br /> results of Iaboratory analyses and field monitoring for the presence of organic vapors is <br /> shown in Tables 1. <br /> Total petroleum hydrocarbons as diesel fuel Nvere reported in four of the five samples <br /> collected from the 10,000-gallon diesel tank ex avation (Table 1). When present, the diesel <br /> concentrations ranged from 9.9 mg/Kg to 430 mg/Kg. The highest concentrations were <br /> found in the sample collected from beneath the center of the slab in the bottom of the <br /> excavation (430 mg/Kg in sample No. 025) and the sample collected from the northern side <br /> of the tank excavation (290 mg/Kg in sample No. 017). Benzene, toluene, ethylbenzene, <br /> and xylenes concentrations were reported to be below the laboratory's limit of detection <br />