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KLEINFELDER <br /> concentrations of naturally ' occurring volatiles, such as methane. Some of these <br /> constituents may have been recorded in the field. <br /> After each sample was screened in the field, the FID readings were recorded on the boring <br /> logs. A summary of the FID readings for the samples are presented in Table 1. <br /> For the protection of the field crew, the FID was also used to measure the total volatile <br /> concentrations in the breathing zone prior to and during the drilling of the borings. No <br /> volatile concentrations were detected during drilling in the breathing zone. <br /> 3.4 SOIL SAMPLE ANALYSES AND RESULTS / <br /> i <br /> Soil samples were submitted to Mobile Chem Labs Inc. to provide uantitativ <br /> assessment of possible petroleum hydrocarbon contamination. Selection of the samples <br /> analyzed was based on field observations, depth in the boring, FID field screening results, j <br /> and an attempt to assess the lateral and vertical extent of possible contamination <br /> surrounding the tank excavation. <br /> Twenty-one samples were analyzed for TPH extractable by GC-FID for both gasoline and ' <br /> tY P Y . <br /> •diesel using EPA Metho �02 , 550, and 8015. Benzene, toluene, el'thylbenzene, and j <br /> xylenes (BTEX)were also analyzed using EPAMethod 8020. <br /> Analytical results for Sample 21909 collected from B-4 at 9 feet below the surface was <br /> 3,000 ppm of TPH as diesel. A second Sample 21913 from B-7 at 13 feet detected a f <br /> concentration of 14 ppm TPH as diesel. All other..samples were nondetect for TPH as both <br /> gas and diesel. The BTEX analyses were also below detection limits in the samples <br /> I <br /> analyzed. Table 2 summarizes the soil samples analytical results. The!: chain-of-custody !, <br /> forms and laboratory data sheets are included in Appendix C. <br /> I. <br /> h <br /> 150-88-2193 5 <br />