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DU PONT ENVIRONMENTAL RRDJEDIANON SERVICES <br />7068 Kall Center Parkway, Suite 401 <br />Pleasanton, CA 94566 September 25, 1990 <br />(415) 462-7772 Job No. 1088-Q13-4 <br />Fax: (415) 462-7944 <br />Mr. Gregory P. Fletcher <br />Conoco Inc. <br />600 North Dairy Ashford <br />TR 3056 <br />Houston, Texas 77079 <br />SUBJECT: Quarterly Ground -Water Sampling Report <br />July 1990 <br />Former Econo Gas Station <br />4325 East Washington Street <br />Stockton, California <br />Dear Mr. Fletcher: <br />INTRODUCTION <br />This report presents the results of the quarterly ground -water sampling which was conducted at the <br />— Farmer Econo Gas Station, 4325 East Washington Street, Stockton, California (see the Location Map, <br />se of this sampling program is to monitor and evaluate the <br />Figure I), on July 19, 1990. The purpo <br />extent of hydrocarbon contamination in the ground water at the subject property. <br />SUMMARY <br />} <br />.- A summary of data regarding ground -water levels for the July 1990 quarter is presented in Table A. <br />In general, ground -water levels have dropped approximately 3.2 feet since the last quarterly sampling <br />{see the Ground -Water Elevation Map on Expanded Site Plan, Figure 2). Chemical analytical results <br />_ indicate that petroleum hydrocarbons remained at non-detectable levels in walls ne Concentrations <br />and MW -304 <br />during this quarter (see Table B and Appendix I3). Figure 3 (Map of Benzene Concentrations on <br />Expanded Site Plan) presents benzene concentrations <br />ncent Owithin <br />the ground water in the vicinity of the site. <br />This site is scheduled to be re p during October <br />Respectfully submitted, <br />DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br />David J. Blunt <br />Steven W. PierceManager, Geological Services <br />Project Hydrogeologist RG 4516 <br />SWP:jv:vo <br />Better Things For Better Living <br />