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Chevron <br /> Chevron <br /> Chevron U.SA Products Company <br /> 6001 Bollinger Canyon Rd., Bldg. L <br /> P.O. Box 5004 <br /> San Ramon, CA 94583-0804 <br /> Site Assessment& Remediation Group <br /> Phone (510) 842-9500 <br /> October 8, 1995 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Former Chevron Station#9-4054.2103 Country Club Blvd Stockton,CA <br /> Attached Groundwater Monitoring Report(Blaine Tech,9/27/95) <br /> Attached Notification Letter(Chevron, 7/27/95) <br /> Dear Mr. Infurna <br /> Attached you will find a report dated September 27, 1995,which was prepared by Chevron's consultant, <br /> Blaine Tech Services,Inc. (Blaine Tech),to describe the results of groundwater monitoring that was <br /> performed at the subject site on August 25, 1995. <br /> In August,Blaine Tech gauged and sampled all nine site-related wells.The measured direction of <br /> groundwater flow was toward the northeast under a hydraulic gradient of 0.005 ft/ft All groundwater <br /> samples were analyzed for the presence of TPHGas and BTEX constituents. Detectable concentrations of <br /> dissolved hydrocarbons were measured at all wells The measured concentrations were consistent with <br /> those measured during previous site monitoring events.The measured concentrations detected at well <br /> MW-9 suggest that the downgradient extent of the dissolved hydrocarbon plume has not been completely <br /> defined. As such,Chevron will submit a workplan to your agency by October 30, 1995 to propose <br /> additional site assessment activities for the purpose of obtaining downgradient plume definition. <br /> Attached you will also find an example of the letter used by Chevron's consultant, Gettler-Ryan,Inc. <br /> during their survey of domestic water wells in the vicinity of the subject site. A report describing the <br /> findings of their survey will be submitted to your agency as soon as it becomes available. <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 />