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