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i. <br /> wo Chevron <br /> Owasso us.A.Products company <br /> 2410 Camino Ramon <br /> April 20, 1994 San Ramon.CA 94583 <br /> P.O.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> mm <br /> Ms. Mary Meays PPhhone�51a0 842299500 <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton,CA 95201 <br /> Re: r SigiW Oil&ak&Mon#221-5,5431 Granding <br /> Attached environmental assessment report(GTI,4/7/94) Banta. CA <br /> Dear Ms. Meays: <br /> Attached is an environmental assessment report dated April 7, 1994, which was prepared by <br /> Chevron's consultant, Groundwater Technology Inc. (GTI), to describe the results of additional <br /> soil and groundwater investigation performed at the subject site on January 6, 1994. <br /> Three soil borings were drilled to groundwater. Soil samples collected from each boring were <br /> analyzed for the presence of TPHGas,TPMesel,and BTEX constituents Soil samples analyzed <br /> from boring SB-4 at 10.0 feet below surface indicated the presence of benzene and ethylbenzene at <br /> 0.007 ppm and 0.005 ppm, respectively. No other petroleum hydrocarbons or hydrocarbon <br /> constituents were detected in soil beneath the site. <br /> Temporary groundwater monitoring wells were installed in two of the three soil borings. <br /> Groundwater samples were collected and depth to water was measured in each temporary well, as <br /> well as, in existing well MW-1. The measured direction of groundwater flow was toward the <br /> north-northwest. With the exception of 55.0 ppb TPHGas measured at temporary well TW-2, no <br /> other petroleum hydrocarbons were detected in groundwater beneath the site. <br /> Chevron proposes to install two additional groundwater monitoring wells in order to verify the <br /> apparent clean conditions over a complete hydrologic cycle. A work plan describing this proposal <br /> will be submitted to your agency on or before May 30, 1994. <br /> If you have any questions or comments,I can be reached at(510) 842-8695. <br /> Sincerely, <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />