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Chevron <br /> ^— �r Chevron <br /> R F <br /> JUN 16 7997 Chevron Products Company <br /> June 12, 1997 ENV � ,. 'i Ffi..,saLTH 6001 Bollinger Canyon Road <br /> Building L <br /> PERivo / ERVICCCS San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> San Ramon,CA 94583-0904 <br /> Ms.Mary Meays Marketing—Sales West <br /> San Joaquin County Environmental Health Phone 510 842-9500 <br /> 304 E. Weber Ave.,Third Floor <br /> Stockton, CA 95202 <br /> Re: Chevron Station#9-6171,6633 Pacific Avenue, Stockton, CA <br /> Attached groundwater monitoring report(Getder-Ryan,3/31/97) <br /> Dear Ms. Meays: <br /> Please find attached a report dated March 31, 1997,that was prepared by Chevron's consultant, Gettler- <br /> Ryan,Inc. (Getder-Ryan),to describe the results of groundwater monitoring that was performed at the <br /> subject site on February 24, 1997. <br /> During their February site visit Gettler-Ryan gauged and sampled all six site-related wells. All <br /> groundwater samples were analyzed for the presence of TPHGas,BTEX constituents, and MTBE. The <br /> measured direction of groundwater flow was toward the east-southeast. There were discrete peaks <br /> measured and reported within the range of TPHGas at wells MW-2 through MW-6.However, these <br /> detections more than likely represent interference caused by chlorinated compounds that are known to <br /> exist in groundwater beneath the subject site. There were reportable detections of dissolved hydrocarbons <br /> measured in groundwater at wells MW-2,MW-4,MW-6,and MW-7. Except for the reported <br /> concentrations at well MW-7,all results were consistent with previous site measurements. The recent <br /> detections at well MW-7 confirm those reported during the last quarterly sampling event. There were <br /> trace levels(2.9 ppb)of MTBE detected at well MW-2. This detection was not confirmed with GC/MS <br /> analysis. <br /> The following monitoring schedule was proposed to your agency in a letter dated February 28, 1997. No <br /> comment has been received on that proposal. Until notified otherwise, it will remain in effect. <br /> - Gauge and sample wells MW-2,MW-6,and MW-7 semi-annually (1st and 4thQtrs.) <br /> -Discontinue gauging and sampling all other wells <br /> -Analyze all samples for BTEX and MTBE only(EPA 8020 method) <br /> -Report semi-annually;report will not include a potentiometric surface map. <br /> If you have any questions or comments,I can be reached at(510)842-8695. <br />