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i <br /> f <br /> Awtibb <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> July 22, 1996 Building L <br /> San Ramon,CA 94583 <br /> P0.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 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevron Station#9-0557, 139 South Center Street, Stockton, CA' <br /> Attached groundwater monitoring report(Blaine Tech, 2/28/96) <br /> Dear Ms.Meays: <br /> Attached you will find a report dated March 28, 1996,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 February 22, 1996. <br /> During their February site visit Blaine Tech gauged and sampled all six site-related wells. All <br /> groundwater samples were analyzed for the presence of TPHGas and BTEX constituents. The measured <br /> direction of groundwater flow beneath the'subject site was southeasterly. Detectable concentrations of <br /> dissolved petroleum hydrocarbons were measured at only three of the six wells. The measured levels at <br /> MW-2,MW-5, and MW-6 were consistent with those previously detected. <br /> I would like to acknowledge receipt of your letter dated January 25, 1996. In that letter you pointed out <br /> deficiencies that existed in two separate groundwater monitoring reports. The first report(Blaine Tech, <br /> 12/4/95)contained a laboratory data sheet that was illegible. As per your request,I have attached copies of <br /> the suspect data sheet(s). The other deficiency that was noted pertained to results reported for well MW-6 <br /> for the February 24, 1995 sampling event that were incorrect. This error has been pointed out to Blaine <br /> Tech and will be corrected in all subsequent reports. <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 /> Attachment <br /> cc: Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Tom Portele, Greyhound Lines,P.O.Box 660362,Dallas,TX 75266-0362 <br />