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! <br /> i <br /> Limited Environmental Investigation July 16, 1990 l <br /> ARCO Service Station No. 6100,Tracy, California AGS 30041-1 <br /> 150 and 42 ppm,respectively; benzene,toluene,and ethylbenzee,a were below 1.0 ppm and <br /> total xylenes were 1.0 to 12 ppm, req ctively. <br /> CONCLUSIONS <br /> Hydrocarbons were detected in soil near the existing tank cavity to 45 feet below grade in <br /> boring B-1, 20 feet in boring B-2, and 10 feet in boring B-3. Hydrocarbons were deiccted <br /> in the soil underlying the proposed tank cavity at depths of 15 and 20 feet {borings B-4 and z <br /> ah - - <br /> { — B-5). Results of analyses of the samples collected from 20 to 30 feet below grade in borings <br /> B-4 through B-5 indicated hydrocarbons were below detection levels. <br /> 1 <br /> L' The Logs of Boring indicate saturated sediment occurs at approximately 19-1/2 to 20 feet s <br /> below grade in borings B-1 and B-3 and at approximately 14-1/2 and 15 feet below grade <br /> in boring B-4. The saturated zone did not produce an adequate amount of water to <br /> 4 <br /> i — accumulate in the boring. <br /> y i <br /> } <br /> s . V' 12 <br /> `' APV11,90fGe®SVStems <br />