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Chevron <br /> Chevron <br /> Chevron Products Company <br /> February 28, 1997 <br /> 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.0.Box 6004 <br /> San Ramon,CA 94583-0904 <br /> Ms:Mary Meays Marketing—Sales West <br /> San Joaquin CountyEnvironmental Health <br /> P.O.Box 388 Phone 510 842-9500 <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, 10/31/96) <br /> .Dear-.Ms.Meays: <br /> Attached you will find a.reportdated,October.31, 1996,which was prepared by Chevron's consultant, <br /> Blaine Tech Services,Inc. (Blaine Tech),to describe the results of groundwater monitoring that was <br /> performed at the subject site on September 24, 1996. <br /> In-Septeinber,.Blaine Tech gauged and sampled all nine site-related wells. All groundwater samples were � <br /> analyzed for the presence of TPHGas,BTEX constituents;and MTBE . The measured direction of <br /> groundwater flow was toward the east-northeast. This was consistent with previous flow direction <br /> measurements. Dissolved petroleum hydrocarbons were:detected,at all wells except,MW-7. In general, <br /> the measured concentrations were consistent with.those detected previously at the subject site.However,.a, <br /> significant increase in TPHGas,BTEX,and MTBE was measured at well MW-9. Subsequent results <br /> acquired from this well will be evaluated to confirm any developing trend. There was MTBE detected at <br /> all site wells except,MW-3 and MW-7. The measured levels were consistent with those detected during <br /> the previous site monitoring event. <br /> If you have any questions or comments,I can be reached at(510)842-8695. <br /> Sinnccerely, <br /> Brett E.Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> CC' Elizabeth Thayer, Central Valley RWQCB,.Sacramento, CA <br /> Kyle Cluistie,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 /> �k� 1�t?c;y�)rat3le <br />