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} r Chevron- <br /> � ,l' I T11 <br /> Chevron <br /> 7�• ,� Ir r <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> August 19, 1996 Building L <br /> San Ramon,.CA 94583 <br /> P0.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#9-4275,.2905 West Benjamin Holt Drive, Stockton, CA <br /> Attached groundwater monitoring.report(Blaine Tech,7/24/96) <br /> Dear Ms.Meays: <br /> Attached you will find a report dated,July 24, 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 June 18, 1996. <br /> .In June,Blaine Tech gauged and sampled all nine wells. All groundwater samples were analyzed for the <br /> presence of TPHGas,BTEX constituents, and MTBE. The measured direction of groundwater flow was <br /> toward the northeast. This was consistent with previous flow direction measurements. Dissolved <br /> petroleum hydrocarbons were detected at all wells except,MW-3,MW-7, and MW-9. The measured <br /> concentrations were consistent with those detected previously at the subject site.Despite the absence of <br /> petroleum hydrocarbons at well MW-3,there were 28.0 ppb MTBE detected.Further testing of MTBE <br /> will aid in confirming its presence and distribution in groundwater beneath the subject site. <br /> If you have any questions or comments,I can be reached at(510)842-8695. <br /> Sincerely, <br /> Brett L.Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc: Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Kyle Christie, ARCO Products Co., 2155 South Bascom Ave., Ste. 202, Campbell, CA 95008 <br /> Steve Misner,Brown and Caldwell, 9616 Micron Ave., Suite. 600, Sacramento, CA 95827 <br /> Kent O'Brien, Geraghty&Miller, 1050 Marina Way South,Richmond, CA 94804 <br />