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Chevron U.S.A. <br /> Page 29 <br /> The test results of the groundwater samples obtained from the recently <br /> T constructed wells (April 1 i, 1990) showed little contamination. These results were <br /> repeated with the May 9, 1990 sampling. The August 17, 1990 sampling represented a <br /> third round of sampling with similar test results. The August 17, 1990 sampling <br /> revealed monitoring well MW-2A, MW-B and MW-11 to have only slight petroleum <br /> contamination. These three consecutive relatively clean petroleum contamination test <br /> results of MW-2A further supports the suspicion that MW-2 has been contaminated by <br /> external sources. <br /> 10.0 DISCUSSION OF FINDINGS <br /> The subject property is located at the northeast corner of Pershing and Robinhood <br /> Drive in Stockton,California. The subject property is currently developed as a <br /> retail gasoline dispensing service station. <br /> Recent improvement at the subject service station includes replacement of <br /> product, vent and vapor lines in mid-1986. Fallowing the product line replacement in <br /> late-1988,three groundwater monitoring wells were installed by Groundwater <br /> Technologies Inc. In early-1988, four additional groundwater monitoring wells were <br /> installed by Weiss Associates to further assess the lateral migrat;on of hydrocarbon <br /> contamination. During mid-1988 updated product lines were installed with the <br /> replacement of the waste-oil and gasoline tanks. During this sequenco of <br /> reconstruction,.contaminated soils were observed along the product line and below the <br /> waste-oil and gasoline tank excavation pit. <br /> r; 16000-206-044 <br /> 11x\11::; <br />