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ATTACHMENT A <br /> SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Chevron 20-1383, 1960 West 11`h Street,Tracy, CA <br /> On January 18, 1991, Groundwater Technology, Incorporated (GTI) advanced seven soil <br /> borings to assess initial site conditions before the Chevron service station was built. Three of <br /> the borings were converted into temporary wells for collection of groundwater samples. <br /> Analytical results for soil and groundwater samples were non-detect for total petroleum <br /> hydrocarbons quantified as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), and poly chlorinated biphenals (PCBs). Endosulfan sulfate (pesticide) was detected <br /> in two of the groundwater samples. 4,4 DDE (pesticide) was detected in six of the soil <br /> samples from 2 feet below ground surface (bgs). Four soil samples also contained 4,4 DDT <br /> (pesticide). These pesticide detections are most likely residual concentrations left in the soil <br /> from agricultural use at the site. <br />