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Chevron j <br /> hh �,� �:����•�-•: ;,- HEA TH � Chevron <br /> L15rfliJl�i <br /> E <br /> z <br /> �G <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Raman <br /> March 30, 1994 San Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Marketing Department <br /> Ms. Linda Turkatte Phone 510 842 9500 <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 '" f <br /> 4, t <br /> Re: Chevron Station#9-6465, 5608 North Pershing Avenue, Stockton, CA <br /> Attached groundwater monitoring report(GTI, 1/3 1/94) <br /> Attached estimate of remaining hydrocarbon mass(revised) <br /> Attached site map showing areal extent of remaining hydrocarbon mass <br /> Attached derivation of remaining hydrocarbon mass <br /> Dear Ms. Turkatte: <br /> Attached is a report, dated January 31, 1994, which was prepared by Chevron's consultant, <br /> Groundwater Technology, Inc. (GTI), to describe groundwater monitoring and sampling that was <br /> performed at the subject site on December 30, 1993. <br /> The measured direction of groundwater flow was toward the west. This measured direction is <br /> inconsistent with previous site m_easurements. Historically, the groundwater flow <br /> direction has <br /> been north-northeasterly. Monitoring wells MW-4A, MW 10, and- MW-11 were sampled and <br /> analyzed for the presence of TPHGas and BTEX. No detectable concentrations of dissolved <br /> hydrocarbons were measured in"wells MW-4A and MW-11. Trace amounts of toluene were <br /> detected in the sample from MW-10. However, this is not believed to be representative of <br /> groundwater at this location due to the presence of toluene detected in the trip blank/lab blank <br /> sample. <br /> As requested in your letter dated, January 5, 1994, 1 am providing a revised estimate of the <br /> remaining hydrocarbon mass which takes into consideration the presence of xylenes detected in <br /> soil at well MW-S. Attachments are included to illustrate the area of consideration and the <br /> calculations that were used to derive the .revised estimate. I hope you find this revised estimate <br /> useful in your evaluation for case closure. <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, ,p <br /> Recyclable <br />