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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 15, 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,9/29/95) <br /> Dear Ms. Meays: <br /> Attached you will find a report dated September 29, 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 /> August 20, 1995. <br /> In August, Gettler-Ryan gauged and sampled all six wells. All groundwater samples were analyzed for the <br /> presence of TPHGas and BTEX constituents. In addition, samples collected from wells MW-2,MW-4, <br /> and MW-5 were analyzed for volatile organic compounds(VOC's).The measured direction of <br /> groundwater flow was southeasterly. Detectable concentrations of dissolved petroleum hydrocarbons were <br /> only measured at well MW-2.There were reported concentrations of TPHGas at wells MW-4 and MW-5 <br /> however,the laboratory reported that the concentrations were derived from discrete peaks within the C8- <br /> C9 range. It is suspected that these discrete peaks are associated with tetrachlorethene(PCE)which,was <br /> detected at both wells. There was also PCE detected at well MW-2. <br /> If you have any questions or comments, I can be reached at(510)842-8695. <br /> Sincerely, �< <br /> I4`,,. <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 11, Sims-Grupe Mgm't., 374 Lincoln Center, Stockton, CA 95207 (_n <br />