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���i 1 t r� eK n <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> Se tember 30, 1994 Building L <br /> p San Ramon,CA 94583 <br /> P.O.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms. Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-4275,2905 West-Benjamin Holt Drive, Stockton, CA <br /> Attached Additional Site Assessment Report(GTI,8/12/94) <br /> Dear Ms. Meays: <br /> r <br /> Attached is a report dated August 12, 1994, which'was prepared by Chevron's consultant, <br /> Groundwater Technology, Inc: (GTI), to describe field procedures and the results.obtained during <br /> additional subsurface assessment performed at the subject site on June 20, 1994. GTI's report also <br /> describes the results of groundwater monitoring which was performed on June 27, 1994. <br /> There were four soil .borings and one groundwater monitoring well drilled during the additional <br /> subsurface investigation. Soil and groundwater samples were collected and analyzed for the <br /> presence of TPHGas and BTEX constituents. TPHGas and BTEX were detected in soil at all <br /> boring and well locations. The greatest concentrations were detected in the capillary fringe (15 ft. <br /> below surface) at boring SB-2. <br /> During June, GTI gauged and sampled all nine site-related wells. The measured direction of <br /> groundwater flow was toward the east. Dissolved petroleum hydrocarbons were detected at all <br /> wells except MW-3; MW-4, MW-7, and MW-8. The detected concentrations were consistent with <br /> those measured during previous monitoring events. <br /> The results presented in GTI's report add further definition to the extent of residual hydrocarbons <br /> in soil. These data will be used to effectively design and implement the remedial action plan. The <br /> plan for corrective action will be submitted to your agency by January 31, 1995. <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, <br /> RecyGF,ad <br />