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4 s <br /> Chevron <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon, San Ramon, California -Phone (510)842-9500 <br /> Mail Address.P.O.Box 5004,San Ramon,CA 94583-8894 <br /> Marketing Department -- <br /> December 10, 1991 <br /> Ms.Mary Meays <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> 7— T s „ <br /> Stockton, CA 95201 _ • rr ::z w.R t <br /> DEC 1 6Pet <br /> 3 <br /> Re: Former Chevron Station#9-1918 EC<'\llPUN.IVIIENV�L ?^1E,ALTH <br /> 45 East Harding Way, Stockton,CA PERMIT/8LRVICC5 <br /> Dear Ms.Meays: <br /> Enclosed is a report dated November 14, 1991 which"was prepared by Chevron's consultant, EA <br /> Engineering, Science, and Technology(EA), to describe groundwatermonitoring which occurred <br /> on October 23, 1991 at the site captioned above. <br /> EA measured the depth to groundwater and collected a groundwater sample from well MW-9. <br /> Laboratory analysis of the sample indicated that no benzene(B)was detected but that toluene(T), <br /> ethylbenzene (E), and xylenes (X) were detected_ at concentrations of 2.3,' 3.91 and 1.6 ppb, <br /> respectively. I would like to point out the B, T, E; and X levels were well below the established <br /> federal EPA Maximum Contaminant Levels of 5, 1000;700, and 10000 ppb, respectively. <br /> E <br /> If you have any questions or comments, you may contact me at(510) 842-8658. r <br /> Sincerely, <br /> Clint B. Rogers . <br /> Environmental Engineer <br /> i <br /> Enclosure <br /> i <br /> cc: Elizabeth Thayer, Central Valley,RWQCB, Sacramento, CA <br /> Geoffrey Bain(for Richard Blewett), 2146 Crestmoor Dr.; San Bruno, CA 94066 <br /> John Borkovich, GTI, Sacramento, CA <br /> Doug Oram, EA Engineering, Lafayette, CA(w/o enclosure) <br /> f <br /> j <br /> f <br />