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W � Chevron Groundwater Monitoring Report(2Q20D2) Page 2 of 2 Facility: #9-8264—3775 Tracy Boulevard,Tracy,CA Date: June 26,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc.on April 18,2002. Four wells were sampled during this event. TPHd was detected at concentrations of 60µg/1 in the sample collected from MW-3 and 1,100µg/1 in the sample collected from MW-4. TPHg was detected at concentrations of 160µg/1 in the sample collected from MW-3 and 37,000µg/1 in the sample collected from MW-4. MtBE was detected at concentrations of 2,000µg/1 in the sample collected from MW-3 and 360µg/1 in the sample collected from MW-4. The concentration of MtBE in the sample collected from MW-3 was confirmed using EPA Method 8260 at a concentration of 2,200 µg/1. Depth to water across the site increased an average of approximately 0.28 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. i� 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 1 —Screen Intervals • Attachment A—May 28,2002 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.O.Box 259,Sonoma,CA 95476