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Chevron <br /> ra,Th, „r 1_Til 1/ Chevron <br /> 1'.'.Y 1 I PH I: 48 <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Ramon <br /> May 7, 1994 San Ramon,CA 94583 <br /> y P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Marketing Department <br /> Ms. Mary Meays Phone 510 842 9500 <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-6171, 6633 Pacific Avenue, Stockton, CA <br /> Attached groundwater monitoring reports(Sierra; 10/25/93, 2/7/94) <br /> Dear Ms. Meays: <br /> Please find attached reports dated October 25, 1993 and February 7, 1994, which were prepared <br /> by Chevron's consultant, Sierra Environmental Services (Sierra), to describe groundwater <br /> monitoring performed at the subject site on September 29, 1993 and December 29, 1993. <br /> During Sierra's September site visit the measured direction of groundwater flow was toward the <br /> southeast. All six site-related monitoring wells were sampled. Dissolved petroleum hydrocarbons <br /> were detected at all wells. The detected concentrations were consistent with those measured during <br /> previous groundwater monitoring events. <br /> The measured direction of groundwater flow during the December site monitoring event was again, <br /> southeasterly. Sierra sampled all six site-related wells and analyzed groundwater for the presence <br /> of TPHGas and BTEX constituents. Detectable concentrations of petroleum hydrocarbons were <br /> measured at all wells. <br /> I apologize for the late transmittal of these reports. If you have any questions or comments, I can <br /> be reached at(510) 842-8695. <br /> Sincerely, <br /> 16- (2d—/, <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />