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Chevron <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> September 27, 1996 6001 Bollinger Canyon Road <br /> Building L <br /> San Raman;CA 94583 <br /> PO.'Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Mr.Harlin Knoll <br /> San Joaquin County Public Health Services_ Marketing—Northwest Region <br /> P.O. Box 388 Phone 510 8429500 <br /> Stockton, CA 95201-0388 <br /> Re.- Chevron Station#9-4183, 236 N. Ham Lane Lodi;CA <br /> Attached Groundwater Monitoring Report(Blaine Tech, 8/21/96) <br /> Attached Well Abandonment Summary Report(G-R, 9/10/96) <br /> Dear Mr. Knoll: <br /> Please find attached a report dated August 21;1996, which was prepared by Chevron's consultant,Blaine . <br /> Tech Services,Inc. (Blaine tech),to describe the results-of groundwater monitoring that was performed at <br /> the-subject site on July 31, 1996. <br /> In July Blaine Tech gauged and sampled all three site-related-wells. The measured direction of <br /> groundwater flow was toward the southwest.'Groundwater.samples from each well were analyzed for the <br /> presence BTEX constituents,MTBE,and halogenated volatile organic compounds(HVOC's). There were <br /> no detections of BTEX constituents measured at any well.MTBE was detected at 7.9 ppb and 4.1 ppb at <br /> wells MW-1 and MW-2, respectively. There were detectable concentrations of tetrachloroethane measured i <br /> at wells MW-1 and MW-2. The measured levels were consistent with those detected during previous } <br /> monitoring events. <br /> Attached you will also find, a report dated September 10, 1996, that was prepared by Chevron's <br /> consultant, Gettler-Ryan, Inc. (G-R), to describe the formal abandonment of groundwater monitoring <br /> wells MW-1,MW-2, and MW-4. Groundwater monitoring well MW-3 was previously abandoned on <br /> April 18, 1996, i <br /> The attached reports represent the final docurrents'rclated to environmental investigations at the subject <br /> site. The site was recommended for case closure and formal approval was received in a letter from your <br /> agency dated September 20, 1996. <br /> If you have any questions or comments,I can be reached at(510) 842-8695. k <br /> Sincerely, <br /> F?i�yfiteCi <br />