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Du Punt Envirlllninenlid Services Junk, 29, 1990 Joh No. 1088-012-4 Conoco Inc. 600 North Dairy Ashford TR 3056 Houston, Texas 77079 ATTENTION: Mr. Gregory P. Fletcher SUBJECT: Quarterly Ground -Water Sampling Report April 1990 Former Econo Gas Station 4325 Gast Washington Street Stockton, California Dear Mr. Fletcher: INTRODUCTION This report presents the results of the quarterly ground -water sampling which was conducted at the former Econo �• Gas Station, 4325 East Washington Street, Stockton, California (see the Location Map, Figure 1), on April 25, 1990. The purpose of this sampling program is to monitor and evaluate the extent of hydrocarbon contamination in the ground water at the subject property. SUMMARY A summary of data regarding ground -water levels for the April 1990 quarter is prose^ted in Table A. Ground- water levels in monitoring wells MW -303 and MW -304 have dropped an average of approximately 2 feet since the last quarterly sampling. Monitoring wells MW -1 through MW -26 remained dry this quarter. The lack- of a sufficient number of water level data points prevents a determination of the ground -water gradient (see the Ground -Water Elevation Map on the Expanded Site Plan, Figure 2). Chemical analytical results indicate nondetectable concentrations of petroleum hydrocarbons in the ground water in monitoring wells MW -303 and MW -304 (see Table B and Appendix B). Figure 3 presents benzene concentrations within the ground water for the site. This site is scheduled to be resampled during July 1990. Respectfully submitted, DU PONT ENVIRONMENTAL SERVICES — Steven W. Pierce David J. Blunt Project Hydrogeologist Registered Geologist RG 4516 SWP/UJ B.-jv i 7068 Noll Center Parkwa7 Suile 401 • Pleasanton, Ca!ilornia 94566 {415) 462.7172 (900) 468-2122 FAX (415) 462-7944 As!oi Pe;mf!,ran a P!easamon Ca!er^ a r Arra �, CAIrcrr:a kous!o�, lovas Soca Raton, Florida