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*ago, <br /> chevron <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> January 16, 1996 <br /> Marketing—Northwest Region <br /> Phone 510 842 9500 <br /> Ms. Mary Meays <br /> San Joaquin County Environmental Health <br /> P.O. Box 388 <br /> Stockton,CA 95201-0388 <br /> Re: Chevron Station#9-6171, 6633 Pacific Avenue, Stockton,CA <br /> Attached groundwater monitoring report(Gettler-Ryan, 12/11/95) <br /> Dear Ms. Meays: <br /> Please find attached a report dated December 11, 1995,which was prepared by Chevron's consultant, <br /> Gettler-Ryan, Inc. (Gettler-Ryan),to describe groundwater monitoring performed at the subject site on <br /> November 5, 1995. <br /> During their November site visit Gettler-Ryan gauged and sampled all six wells. All groundwater samples <br /> were analyzed for the presence of TPHGas and BTEX constituents. The measured direction of <br /> groundwater flow was toward the southeast. Detectable concentrations of dissolved petroleum <br /> hydrocarbons were measured at all wells except,MW-7. The detections of TPHGas reported for all wells <br /> were based on the presence of discrete peaks within the C8-C9 range. It is suspected that these discrete <br /> peaks are associated with tetrachlorethene(PCE). The relatively low concentrations of toluene reported for <br /> wells MW-3,MW-5,and MW-6 were inconsistent with recent trends. Subsequent monitoring results from <br /> these wells will be evaluated to confirm the presence of these constituents. <br /> If you have any questions or comments, I can be reached at(510)842-8695. <br /> Sincerely, ,Q <br /> d,x /� <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc: Elizabeth Thayer,Central Valley RWQCB, Sacramento, CA <br /> Wilbur Smith 1I, Sims-Grupe Mgm't., 374 Lincoln Center, Stockton, CA 95207 <br />