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r � Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 Facility #9-6171—6633 Pacific Avenue Stockton,CA Date October 23,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 16, 2002 Thirteen wells were monitored and sampled TPHg was detected in ten of the wells sampled at concentrations ranging from 52 gg/l in the sample collected from MW-10 to 1,800 µg/1 in the sample collected from MW-7 Benzene was detected in two wells at concentrations of I µg/l in the sample collected from MW-2 and 0 6 Ltg/l in the sample collected from MW-6 MtBE was detected in two wells at concentrations of 2 pg/l in the sample collected from MW-6 and 56 pg/l in the sample collected from MW-8 Groundwater elevations decreased across the site an average of approximately 1 78 feet this quarter Groundwater flow was calculated to be to the east-southeast at approximately 0 01 to 0 04 ft/ft,consistent with historical data LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc Gettler- Ryan's report is attached The data presented in this summary is accurate only to the degree implied by the sources and methods used No warranty, expressed or implied, is made by SECOR If you have any questions, please feel free to call us at(916)861-0400 Sincerely, SECOR International Inc fW Ro r Hoffmor Protect Manager ATTACHMENTS: • Table 1 —Screen Intervals • Attachment A—August 26,2002 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc cc Bob Cochran, CEMC,P O Box 6004, San Ramon,CA 94583-0804 Marty Hartzell,RWQCB-CVR, 3443 Router Road, Suite A, Sacramento, CA 95827 Wilbur Smith 1I, Sims-Grupe Management, 374 Lincoln Center, Stockton, CA 95207 Donald Bradshaw, Levine-Fricke-Recon, 1900 Powell Street, 12`h Floor, Emeryville, CA 94608-1827 •