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s - <br /> �.....,. chemn ifI Chevron <br /> 2' <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Ramon <br /> San Ramon,CA 94583 <br /> December 8, 1993 PD.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 <br /> Re: Chevron Station#9-6465 5608 North Pershing Avenue Stockton CA <br /> Attached groundwater monitoring report(GTI,8119193) <br /> Attached well abandonment and groundwater monitoring report(GTI, 10114193) <br /> Attached estimate of residual hydrocarbon mass remaining onsite <br /> Attached chronology of site environmental activity <br /> Dear Ms. Turkatte: <br /> Attached is a report, dated August 19, 1993, 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 June 24, 1993. <br /> The measured direction of groundwater flow in June was toward the northeast. Seven of the <br /> thirteen groundwater monitoring wells were sampled. Trace levels of dissolved hydrocarbons were <br /> detected in wells MW-2A, MW4A, and MW-8. <br /> Also attached is a report, dated October 14, 1993, which was prepared by GTI to describe the <br /> abandonment of ten monitoring wells on August 2-5, 1993 and September 13-14, 1993. This <br /> report also describes the groundwater monitoring and sampling that was performed on September <br /> 2, 1993. <br /> Soil samples were obtained beneath monitoring wells MW-1, MW-2, MW-3, and MW-6 prior to <br /> their abandonment and were analyzed for TPHGas and BTEX constituents. There were no <br /> detectable concentrations of hydrocarbons measured in any of the samples. The results indicate that <br /> there are no residual hydrocarbons present in the unsaturated soils directly above the groundwater <br /> table at these locations. <br /> During the September 2, 1993 groundwater monitoring event depth to water was measured and <br /> samples were collected from monitoring wells MW-4A, -8, -9, -10, and MW 11. The measured <br /> direction of groundwater flow was toward the northeast. This is consistent with previous site <br /> measurements. Groundwater samples were analyzed for the presence of TPHGas/BTEX <br /> constituents. No dissolved hydrocarbons were detected in any of the wells except, for 61 ppb <br /> TPHG and 4.4 ppb benzene detected in well MW-8. The detected hydrocarbons at MW-8 probably <br /> represent an isolated remnant of groundwater contamination beyond the remediated area and are not <br /> indicative of any significant plume. <br /> q7/ <br />