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Chevron <br /> Chevron <br /> Chevron USA Products Company <br /> 6001 Ballinger Canyon Rd., Bldg. L <br /> P.O. Box 5004 <br /> San Raman, CA 94583-0804 <br /> Site Assessment& Remediation Group <br /> Phone(510)842-9500 <br /> October 8, 1995 <br /> Mr.Michael Inform <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton,CA 95201 <br /> Re: Former Chevron Station#9-4054 2103 Country Club Blvd.. Stockton, CA <br /> Attached Well Development Report(Blaine Tech, 7/18/95) <br /> Attached Groundwater Monitoring Report(Blaine Tech,7/25/95) <br /> Dear Mr. Infurna: <br /> Attached you will find a report dated July 18, 1995,which was prepared by Chevron's consultant,Blaine <br /> Tech Services,Inc. (Blaine Tech),to describe groundwater monitoring well development activities that <br /> took place at the subject site on May 26, 1995. <br /> Blaine Tech developed both,MW-8 and MW-9.During development specific groundwater parameters <br /> were measured. These parameters included;pH,temperature,conductivity,and turbidity. Well <br /> development was complete once each of these measured parameters had stabilized. Following <br /> development,each well was gauged and sampled. <br /> Attached you will also find,a report dated July 25, 1995,which was prepared by Blaine Tech to describe <br /> the results of groundwater monitoring that was performed at the subject site on May 26, 1995. <br /> During their May site visit,Blaine Tech gauged and sampled all nine site-related wells.The measured <br /> direction of groundwater flow was toward the northeast.The hydraulic gradient was determined to be <br /> 0.016 ft/ft.The groundwater samples that were collected from each well were analyzed for the presence of <br /> TPHGas and BTEX constituents. Detectable concentrations of dissolved hydrocarbons were measured at <br /> all wells.The measured concentrations were consistent with those measured during previous site <br /> monitoring events. The concentrations measured'at well MW-8 were consistent with what would be <br /> expected at that respective distance from the source area onsite.The measured concentrations at well <br /> MW-9 suggest that the extent of the groundwater contaminant plume extends beyond that location. Data <br /> obtained during the next groundwater sampling event will be evaluated to confirm this. <br /> If you have any questions or comments,I can be reached at(510)842-8695. <br /> Sincerely, <br /> /- ga�— <br />