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resented <br /> P in Tables One through Three, and the certified analytical report - <br /> and chain of custody forms are included in Appendix C <br /> Hydrocarbons were detected in soil samples collected from all of t h e <br /> ' borings except boring BH-B (Figure 3) Benzene concentrations exceeded <br /> United States Environmental Protection Agency (US EPA) Region IX <br /> preliminary remediation goals (PRGs) for industrial soil in soil samples <br /> ' collected from borings BH-A, BH-D, BH-E, BH-F and BH-G MTBE <br /> concentrations exceeded US EPA PRGs for industrial soil in soil samples <br /> collected from boring BH-C, BH-D and BH-G The total xylenes <br /> ' concentration in boring BH-F also exceeded the US EPA PRG for industrial <br /> soil Total lead concentrations in soil samples collected from borings BH-A <br /> through BH-H ranged from less than 5 0 ppm to l0 ppm These <br /> concentrations do not exceed PRGs <br /> 1 6 .0 ANALYTICAL RESULTS FOR GROUNDWATER <br /> The groundwater samples were analyzed by Chromalab for TPH-G b y <br /> modified EPA Method 503018015, BTEX by EPA Method 8020, and fuel <br /> oxygenates by EPA Method 8260 A groundwater sample from boring <br /> BH-E was also analyzed for extractable-range hydrocarbons because t h e <br /> sample appeared to contain heavier hydrocarbons The groundwater <br /> analytical results are presented in Tables Four and Five, and the certified <br /> 1 analytical report and chain of custody forms are included in Appendix C <br /> Benzene concentrations exceeded California Department of Toxic <br /> Substances Control (DTSC) maximum contaminant levels (MCLs) for <br /> drinking water in groundwater samples collected from all eight borings <br /> drilled for this assessment (Figure 4) Ethylbenzene and/or total xylene <br /> concentrations detected in borings BH-C through BH-F exceeded DTSC MCLs <br /> for drinking water Toluene concentrations in groundwater samples <br /> collected from borings BH-D, BH-E and BH-F exceeded the DTSC <br /> recommended action level (RAL) for drinking water MTBE concentrations <br /> in groundwater samples collected from borings BH-C, BH-D and BH-F <br /> exceeded DTSC interim action levels (IAL) for drinking water The highest <br /> hydrocarbon concentrations were in borings BH-D, BH-E and BH-F in the <br /> vicinity of the USTs No TPH-D or total petroleum hydrocarbons were <br /> detected in the groundwater samples collected from boring BH-E, although <br /> the detection limits were raised to 4,200 parts per billion (ppb) and 42,000 <br /> ppb, respectively due to matrix interference due to the high gasoline <br /> ' content in the sample <br /> 574 West Grant Line Road, Tracy, California - April 1998 <br /> -4- <br />