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Chevron <br /> Chevron <br /> �� �, .�tl ; � Chevron Products Company <br /> February 28, 1997 6001 Bollinger Canyon Road <br /> ry S pv =,'�5y E® Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> SA a . ly San Ramon,CA 94583-0904 <br /> Mr. Harlin Knoll PUBUC' . ' '' ;: CES <br /> San Joaquin County PAV1 tM§&i CLftAL1 H DIVISION Mone tin 84 59500 West <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevioh Stati6h#9=2033, 508 W. Charter Way, Stockton, CA <br /> Attached Groundwater Monitoring Report(Blaine Tech, 1/4/96) <br /> Dear Mr. Knoll: <br /> Please find attached a report dated January 4, 1996,which was prepared by Chevron's consultant,Blaine <br /> Tech Services, Inc. (Blaine Tech),to describe the results of groundwater monitoring that was performed at <br /> the subject site on November 16, 1995. <br /> In November, Blaine Tech gauged and sampled all three site-related wells. The measured direction of <br /> • groundwater flow beneath the site was northeasterly. Groundwater samples collected from each well were <br /> analyzed for the presence of TPHGas and BTEX constituents. In addition, samples from well MW-1 were <br /> analyzed for waste oil constituents(i.e.,TPHDiesel,total oil and grease, soluble metals, and semi-volatile <br /> organic compounds -S VOC's, and halogenated volatile organic compounds-HVOC's). <br /> Dissolved petroleum hydrocarbons were present at wells MW-1 and MW-3. The measured concentrations <br /> of dissolved gasoline constituents were higher at well MW-1 than those detected during the previous site <br /> monitoring event.Data obtained from this well next quarter will be evaluated to determine if an <br /> increasing trend is developing. No dissolved hydrocarbons were detected at well MW-2. Groundwater <br /> from MW-1 also contained measurable concentrations of 1,2 Dichloroethane (17 ppb)and Phenol(8.3 <br /> ppb). An unidentified hydrocarbon was reported during TPHDiesel analysis of groundwater from well <br /> MW-t. The unidentified constituent eluted within the C9-C24 range of hydrocarbons and probably <br /> represents highly degraded(old)gasoline. The reported levels of metals at well MW-1 were mainly non- <br /> detect and were significantly lower than those previously reported. The recent measurements reflect the <br /> concentration of metals dissolved in groundwater and not the total metal concentration as measured <br /> before. The latest measurements are thought to be reflective of naturally occurring background metal <br /> concentrations. <br /> If you have any questions or comments,I can be reached at(510) 842-8695. <br /> Sincerely, <br /> Brett L. Hunter <br /> • <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />