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Limited Environmental Investigation July 16, 1990 <br /> ARCO Service Station No. 6100, Tracy, California AGS 30041-1 <br /> 160 and 42 ppm, respectively,benzene, toluene, and ethylbenzene were below 1.0 ppm and <br /> total xylenes were 1.0 to 12 ppin, respectively. <br /> CONCLUSIONS <br /> Hydroearbons were detected in soil near the existing tank cavity to 45 feet below grade in <br /> r boring 13-1 20 feet in.bo!-ing.-B!2,'and 10 feet in boring B-3. Hydrocarbons were detected <br /> in the soil underlying the proposed tank cavity at depths of 15 and 20 feet (borings B-4 and <br /> i <br /> B-5). Results of analyses of the samples collected from 20 to 30 feet below grade in borings <br /> D-4 through B-5 indicated hydrocarbons were below detection levels. <br /> The Logs of Boring indicate saturated sediment occurs at approximately 19-1/2 to 20 feet <br /> below grade in borings B-1 and B-3 and at approxi�iately 14-1/2 and 15 feet below grade <br /> L: <br /> in boring B-4. The saturated zone did not produce an adequate amount of water to <br /> accumulate in the boring. <br /> 12 <br /> Apty/Ied �eo�yst�ms <br />