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J Chevron Groundwater Monitoring Report(1Q2002) Page 2 of Facility #9-9264-3775 Tracy Boulevard,Tracy,CA Date April 15,2002 • DISCUSSION- This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on January 23, 2002 Four wells were sampled during this event TPHd was detected at concentrations of 2,200 pg/I in the sample collected from MW-3 and 6,600 pg/l in the sample collected from MW-4 TPHg was detected at concentrations of 76,000 µg/I in the sample collected from MW-3 and 210 p.g/l in the sample collected from MW-4 MtBE was detected at concentrations of 630 lig/1 in the sample collected from MW-3 and 3,100 ug/l in the sample collected from MW-4 The concentration of MtBE in the sample collected from MW-4 was confirmed using EPA Method 8260 at a concentration of 3,000 gg/l Depth to water across the site decreased an average of approximately 0 42 feet from the previous quarter Groundwater flow was to the east at a gradient of approximately 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 Brian Silva Project Manager ATTACHMENTS- • Table I —Screen Intervals • Attachment A—February 20,2002 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