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Chevron <br /> � ETNTALPEALT <br /> [ Chevron <br /> i. 11.a{4 ki ! i VV <br /> r Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> June 14, 1996 Building L <br /> San Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon;CA 94583-0804 <br /> Mr.Harlin Knoll Marketing—Northwest Region a <br /> San Joaquin County Public Health Services Phone 510 842 9500 <br /> P:O, Box 388 <br /> Stocktori, CA 95201-0388 <br /> - a <br /> Re: Chevron Station,#9-4183- 236 N. Ham Lane Lodi CA <br /> Attached Groundwater Monitoring Report(Blaine Tech;617196) <br /> Dear Mr. Knoll: ` <br /> Please find attached.a report dated June 7,'1996,which:was prepared by Chevron's consultant,Blaine <br /> Tech Services, Inc. (Blaine tech), to describe the results of groiitidwater monitoring_that was performedat <br /> the subject site on May 15,-1996. <br /> During their.May site visit Blaine Tech gauged and sampled all three site-related welis..Former <br /> monitoring well MW-3 was abandoned on April i8;'1996.The measured direction of groundwater flow <br /> was toward the southwest. This was-consistent with previous measurements.All,groundwater samples <br /> were analyzed for the presence of TPHGas,BTEX constituents, and MTBE. In addition, samples from <br /> well MW=4 were analyzed for,TPHDiesel dissolved metals; semi-volatile organic compounds(SVOC's), <br /> and halogenated volatile organic compounds(I"C's). There were no detectable concentrations of motor <br /> fuel hydrocarbons at any of the wells.-There were detectable concentrations of MTBE measured at wells <br /> MW-1 and MW-2 however, the measured levels were below those relating to the taste and odor <br /> thresholds..A detection of 0.84 ppb TCE was,measured in the sample from well MW-4. This'trace <br /> detection was consistent with those previously detected at former well MW73 and is less than-the MCL for <br /> this compound(5.0 ppb). The measured concentration of dissolved Zinc at MW-4 is thought to be <br /> representative of background levels. All other metals were non-detect.' <br /> The measured concentrations of dissolved contaminants in groundwater beneath the subject.site have been <br /> consistently low or non-detect- The former source areas for,these contaminants-have;all been removed or <br /> remediated. As such,Chevron recommends that this case be.considered for closure. To assist with this <br /> consideration, all'pending reports will'be submitted to your agency on or before,June 30, 1996. <br /> If you have any questions or comments, I'can be reached at(510) 84278695. <br /> Sincerely, <br />