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4-3 <br /> Soil samples collected from the boreholes were analyzed for benzene,ethyibenzene,toluene, <br /> and xylene (BETX),and total petro%um hydrocarbons(TPH),using the EPA Method 8015 with <br /> extraction by EPA Method 5030. Table 4-2 presents a surnr a:y of the analytical results of the <br /> soil samples from this as well as previous investigations at this site. The laboratory report for <br /> the soil analysis are presented in Appendix E. Only the sample analysis from this investigation <br /> will be discussed in this section of the report. The sample analyses from all of the soil samples <br /> A are considered in the conclusions. <br /> Soil BETX Results. Three soil samples were collected from each of the four boreholes <br /> (MW-6 through MW-9) for laboratory analysis. All three of thM soil samples collected from <br /> MW-6 contained identifiable concentrations of benzene and xylene,and two of the samples(fronj <br /> 40 and 50 feet) contained identifiable concentrations of toluene based on a laboratory detection <br /> limit of 0.1 milligrams per kilogram(mg/kg). The BETX concentrations from this borehole-v2re <br /> well below the maximum contaminant levels (MCLS) for the protection of groundwater as <br /> " e�rablished by the Califoniia Regional Water Quality Control Board, Central Valley Region in <br /> y! "� April 1987 (see Table 4-2). <br /> ,�. None of the soil samples analyzed from MW-7 contained identifiable concentrations of <br /> ' BETX. Of the three samples collected from MW-8, only the sample from 50 feet contained <br /> w identifiable BETX concentrations. The sample from 50 feet contained 0.2 mg/kg ethylbenzene <br /> and 0.6 mg/kg xylene which air; both below the designated level for these constituents. <br /> The soil samples analyzed tiom MW-9 did not contain identifiable concentrations of <br /> benzene. The sample from 30 feu.t contained concentrations of ethylbenzene and xylene that were <br /> below the designated Ievels. The sample from 50 feet contained 5.3 mg/kg ethylbenzene, 2.1 <br /> mg/kg toluene, and 2.1 mg/kg xylene which are all also below designated levels. <br /> Soil TPH Results. None of the samples analyzed from monitoring wells MW-6 or MW-7 <br /> contained identifiable concentrations of petroleum hydrocarbons based on a labor:tory detection <br /> j <br />