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Chevron Groundwater Monitoring Report(2Q2001) Page 2 of 2 Facility 49-8264—3775 Tracy Boulevard Tracy,CA Date July 13,2001 • DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on May 17,200I Four wells were sampled during this event TPHd and TPHg were detected in samples collected from MW-4 at concentrations of 31,300 µg/l and 52,300 pg/l, respectively MtBE was detected in samples collected from MW-3 at a concentration of 4,390 pg/l and from MW-4 at a concentration of 1,760 pg/I In addition to the fuel hydrocarbons and oxygenates,the sample collected from MW-1, near the waste oil tank at the site,was analyzed for waste oil-related chemicals Zinc,chromium, and nickel were detected in the sample at concentrations of 136 pg/l, 77 6 gg/l,and 98 8 pg/l, respectively Groundwater analytical results were generally consistent with historical data Groundwater elevations across the site decreased an average of approximately 0 14 feet this quarter Groundwater flow was to the northeast at gradients ranging from 0 002 to 0 003 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 Sincerely, SECOR International Inc f/da �7 A2,-- William E Brasher, P E Project Manager ATTACHMENTS: • Table 1 —Screen Intervals • Attachment A—June 15, 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 Routter Road, Suite A, Sacramento,CA 95827 Joe Neely, Cambria,270 Perkins Street, P O Box 259, Sonoma,CA 95476 •