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1 , <br /> Et: IFrnrr��t-Nr—f.f ?�rAL I� Chevron <br /> I Cfr `0 Chevron <br /> `-' If',� ' p141 17 <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> July 11, 1996 Building L <br /> San Ramon,CA 94583 <br /> PO.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms. Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <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,6/17/96) <br /> Dear Ms. Meays: <br /> Please find attached a report dated June 17, 1996,which was prepared by Chevron's consultant, Gettler- <br /> Ryan,Inc. (Gettler-Ryan),to describe groundwater monitoring performed at the subject site on May 12, <br /> 1996. <br /> During their May site visit Gettler-Ryan gauged and sampled all six wells. All groundwater samples were <br /> analyzed for the presence of TPHGas,BTEX constituents,and MTBE. The measured direction of <br /> groundwater flow was southeasterly. The flow direction was consistent with previous measurements. <br /> Detections of TPHGas were reported at five of the six wells. However,the reported detections were based <br /> on the presence of discrete peaks within the C6-C8 range. It is suspected that these discrete peaks are <br /> associated with chlorinated compounds that are known to exist in groundwater beneath the subject site. <br /> There were detections of BTEX constituents measured at well MW-2.Detectable concentrations of MTBE <br /> (8.4 ppb)were only measured at well MW-6. The results of subsequent monitoring events will be <br /> evaluated to verify the presence of this constituent. <br /> In your letter dated April 11, 1996,you requested information regarding monitoring well completion <br /> details and an evaluation of current monitoring capabilities. Those details are provided on the attached <br /> page. The information regarding groundwater monitoring capabilities will be provided in Pacific <br /> Environmental Group's addendum to their April 4, 1995 Corrective Action Plan,as was requested in your <br /> letter dated April 23, 1996. The addendum will be submitted to your agency on or before July 19, 1996. <br /> If you have any questions or comments, I can be reached at(510)842-8695. <br /> Sincerely, <br /> xe <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br />