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_ reevmn <br /> d Chevron <br /> _ - Chevron U.S.A.Products Company <br /> November 5, 1996 -- 6001 Bollinger Canyon Road <br /> Building L <br /> - San Ramon,CA 94583 - <br /> .. �,. ,.. . - - . .. . � P0.Box 5004 - - <br /> Ms.Maty Meays San Ramon,CA 94583-0804 <br /> San`Joaqum CountyEnvironmental Health <br /> P.O.Box 388 - _ - _ Marketing-Northwest Region <br /> - , Stockton, CA 95201-0388 - - Phone 510 842 9500 ,I <br /> Re: _ Farmer Chevron Station#9-1918, 45 East Harding Way, Stockton CA <br /> Attached groundwater monitoring report(Blaine Tech, 9/19/96) <br /> Dear Ms.Meays: <br /> . z <br /> Attached you will find a report dated September 1.9, 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 July 30, 1996: <br /> . t <br /> During.their July sitewisit;Blaine Tech gauged and.sampled all fourteen 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 variable.Previous measurements have shown a consistent <br /> direction of east-northeasterly. Detectable concentrations of dissolved hydrocarbons were measured at <br /> wells MW-4,MW-6, and MW-9. There were 210 ppb MTBE detected at well MW-9. The groundwater <br /> results at all othet.wells were non-detect.The measured levels at wells MW-4 and MW-6 were consistent <br /> with those detected during the second quarter monitoring event. The reduction of TPHGas concentrations <br /> and absence of benzene at these wells attests to the effectiveness of previous hydrocarbon remediation <br /> efforts. <br /> Chevron has submitted a closure summary report to your agency for consideration. Comments by your <br /> agency regarding the closure report have been received by Chevron and are being addressed in a revised <br /> version. The revised closure summary report should be submitted to your agency by.November 15, 1996. <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> i <br /> Sincerely, <br /> Brett L. Hunter <br /> Environmental Engineer If <br /> Site Assessment and Remediation <br /> Nae ycivh)e _ <br />