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Chevron <br /> Chevron U.S.A. Inc. <br /> M 2410 Camino Ramon, San Ramon, California• Phone (415) 842-9500 <br /> Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 <br /> Marketing Operations November 13, 1990 <br /> D. Moller <br /> Manager,Operations <br /> S. L. Patterson <br /> Area Manager,Operations <br /> C. G.Trimbach w; <br /> Manager,Engineering ," <br /> Mr. Steve Snider NOV 17 1990 <br /> San Joaquin County Environmental Health Services <br /> P. O. Box 2009 ENVIRONMENTAL HEALTH <br /> Stockton, CA 95201 PERIMIT/SERMCES <br /> Re: Chevron SS#9-6171 <br /> 6633 Pacific Ave., <br /> Stockton, CA <br /> Dear Mr. Snider: <br /> Enclosed is a report dated October 8,1990,which was prepared by Chevron's consultant,Sierra Environmental, <br /> to describe the installation and sampling of four monitoring wells at the above reference site in July and August, <br /> 1990. <br /> Analyses of soil and groundwater samples for TPH as gasoline, BTEX, and total oil and grease detected none <br /> of these compounds present above detection limits. <br /> 1 <br /> MW-4, located within 50 feet of a sewer line, was sampled to analyze for total coliform. An analysis for fecal <br /> coliform will be done during the next quarterly monitoring event. <br /> 48"nawlichloroethane was detected in a groundwater sample from MW-5 at 7 parts per billion. As no oil and <br /> grease contaminants were detected, and as there is an investigation of solvent contamination from two nearby <br /> drycleaners, Chevron cannot, at this time, conclude that this low level contamination is a result of Chevron's <br /> operations. <br /> Chevron plans to continue to quarterly monitor this site for three more quarters and then reassess its <br /> environmental activities at the site. <br /> Please direct any questions or comments to Clint Rogers at (415) 842-8658. <br /> Sincerely, <br /> C. G. Trimbach <br /> By T <br /> Clint B. Rogers <br /> CBR/j t:T2-20 <br /> Enclosure <br /> cc: Jim Maughan - Central Valley RWQCB <br /> Wilbur Smith II - Sims-Grupe Management Corp. <br />