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Chewan ChevroN U.S.A. bic. 2410 Camino Ramon,San Ramon, California•Phone 14151042-9500 MA Addreu:P.B.BAs 5004,San Raman,CA 94583•N04 Marketing Oparaiions O.Muller November 13,1990 ( Manager,Bparetions S.1.Patterson Area Manage,Operations C.G.Trimbaeh .u, Manager,Engineering k Mr.Steve Snider ' S i San Joaquin County Environmental Walth Services NOV 1 7 1990 ! Stoc tonXCA 952.01 EWRON5 ENTAL HEA!TH I Re: Chevron SS#9.6171 6633 Pacific Ave., Stc kton, CA i Dear Mr.Snider: Enclosed is a report dated October 8,IM,which was prepared by Chevron's consultant,Sierra Environmental, to describe the installation and sampling of four monitoring wells at the above reference site in July and August, 1990, Analyses of soil and groundwater samples for TPH as gasoline,BTEX,and total oil and grease detected Wont of these compounds present above detection limits. MW-4,located within 50 feet of a sewer Pure,was sampled to analyze for total coliform. An analysis for fecal coliform will.be done during the neat quarterly monitoring event, y ;r -1;1-1..dichloroethana was detected in a groundwater sample from MW-5 at 7 parts per billion. As nn oil and ! grease contaminants were detected,and as there is an investigation of solvent contamination from two nearby drycleaners, Chevron cannot, a;this time, conclude that this low level contamination is a result of Chevron's i operations. Chevron plans to continue to quarterly monitor this site for three more quarters and then reassess its 9 environmental activities at the site. Please direct any questions or comments to Cent Rogers at(415)842-8658, Sincerely, C.G.Trimbaeh 61Y By 't Clint B. Rogers t CBR/jt:72-20 s Enclosure cc: Jim Maughan- Central Valley RWQCB Wilbur Smith 11-Sims-Grupe Management Corp. - n ;