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r Chevron Groundwater Monitoring Report(3Q2001) Page 2 of 2 Facility #9-8264—3775 Tracy Boulevard Tracy,CA Date October 8,2001 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 18,2001 Four wells were sampled during this event TPHd was detected in samples collected from MW-2 at a concentration of 150 µg/I, MW-3 at a concentration of 75 µg/l,and MW-4 at a concentration of 1,800 gg/l TPHg was detected in MW-4 at a concentration of 28,000 µg/l MtBE was detected in samples collected from MW-2 at a concentration of 3 3 µ9l1, MW-3 at a concentration of 2,900 µg/l,and MW-4 at a concentration of 860 pg/I The concentration of MtBE in the sample collected from MW-3 was confirmed using EPA Method 8260,at 5,300 µg/I The sample collected from MW-1 was also analyzed for semi-volatile organic compounds by EPA Method 8270 and volatile organic compounds by EPA Method 8010 No chemicals analyzed for by either method were detected above their respective method detection limits Depth to water across the site increased an average of approximately 0 49 feet this quarter Groundwater flow was to the northeast at a gradient of approximately 0 002 ft/ft,generally 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 iSincerely, SECOR International Inc William E Brasher, P E Project Manager ATTACHMENTS: • Table 1 —Screen Intervals • Attachment A August 17, 2001 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc cc Bob Cochran, Chevron Products Company, P O Box 6004, San Ramon, CA 94583-0804 Marty Hartzell, RWQCB—CVR, 3443 Routier Road, Suite A, Sacramento,CA 95827 Joe Neely, Cambria,270 Perkins Street, P 0 Box 259, Sonoma, CA 95476