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I TIChevmn <br /> wo ;Chevron <br /> 1 <br /> jg <br /> fai . 27 <br /> - . . -. Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road - <br /> 4 May 15, 1996Building <br /> t - - PQ A 94563 <br /> Box 5004 <br /> San Ramon,CA 94583-0804 <br /> 1 Ms. Mary Ways. <br /> San Joaquin County Environmental Health Marketing—Northwest Region <br /> P.O..Box 388 "Phone 510 842 9500 <br /> Stockton, CA 95201-0388 <br /> A <br />' Re: Former Chevron Station#9-1918,45 East Harding Way. Stockton, CA <br />„r <br /> Attached groundwater monitoring report(Blaine Tech, 2/15/96) <br /> hl <br /> j Dear Ms. Meays: <br /> I <br /> Attached you will find a report dated February 15, 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 January 23, 1996. <br /> In January,Blaine Tech gaugedand sampled seven of the fourteen site-related wells.The remaining seven <br /> are completed above the present groundwater level.All groundwater samples were analyzed for the <br /> fpresence of TPHGas and BTEX constituents-. <br /> q The measured direction of-groundwater flow during January was toward the east-southeast.Detectable <br /> concentrations of dissolved hydrocarbons were measured at wells MW79,MW-10, and MW-13. The - <br /> t measured concentrations were consistent with those detected during previous site monitoring events. The <br /> groundwater results at all other wells were non-detect. It should be pointed out that the.measured depth to <br /> groundwater at wells MW-9,MW-10, and'MW-11 was above the top of the screened interval at each well. <br /> The height of water above the screens varied from 2.21eet at MW-11 to 11.9 feet at MW-9. As a result, <br /> measured concentrations at these wells could be lower than those measured when water levels were within <br /> the screened interval.However; the observed trends in concentrations at these wells when water levels <br /> have been within the screened interval show concentrations to be tion-detect or decreasing: <br /> ' If you have any questions or comments, I can be reached at(510)842-8695. <br /> y: <br /> I <br /> s Sincerely, - - - <br /> Brett L. Hunter - - <br /> t Environmental Engineer <br /> Site Assessment and Remediation <br /> i <br /> 1 Recycled y <br /> II`i <br /> Recyclable <br />