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tq V <br /> Chevron. <br /> Chevron <br /> Chevron Products Company <br /> February 4, 1997 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> Ms. Mary Meays San Ramon,CA 84583-0904 <br /> San Joaquin County Environmental Health <br /> P.O.Box 388 Marketing-Sales West <br /> Stockton, CA 95201-0388 Phone 510 842-9500 <br /> Re: Former Chevron-Station#9-1918,45 East Harding Way, Stockton CA 3 <br /> Attached groundwater monitoring report(Blaine Tech, 11/19/96) <br /> Dear Ms.Meays: <br /> Attached you will find a report dated November 19, 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 October 24, 1996. <br /> V <br /> a <br /> In October,Blaine Tech gauged and sampled all fourteen 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 variable.Detectable concentrations of dissolved hydrocarbons were measured at <br /> wells MW-4,MW-6,MW-9,and MW=13. There were detections of MTBE measured at wells MW-9 and <br /> MW-13.However,further analysis of these detections by EPA Method 8260 only confirmed the detection <br /> at well MW-9(200 ppb). The groundwater results at all other wells were non-detect. <br /> There were seven groundwater monitoring wells abandoned during November, 1996.There are seven <br /> wells remaining that would continue to be monitored. Chevron would like to propose the following <br /> modification to the current monitoring program: <br /> f <br /> Gauge and sample wells MW-3,MW-11,and MW-13 annually (1st&3rd Qrtrs.) <br /> Gauge and sample wells MW77,MW-10,MW-12, and MW-14 annually (1st Qrtr.) <br /> Analyze all samples for TPHG,BTEX,and MTBE <br /> Report annually;after 3rd quarter monitoring event <br /> I <br /> f <br /> The proposed program will be implemented as soon as approval is received from your agency. If you have <br /> 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 /> k <br /> Rccyc <br /> fiE;;;yu%u!,pbiC <br /> _ 1 <br />