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Chevron Groundwater Monitoring Report(3Q46i12) <br /> Page 2 of 2 <br /> Facility: 49-8264—3775 Tracy Boulevard,Tracy,CA date: October 28 2DD2 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc.on July 15,2002. Four wells <br /> were sampled during this event. TPHd was detected at concentrations of 69 µg/l in the sample collected from MW- ' <br /> 3 and 4,600 gg/l in the sample collected from MW-4. TPHg was detected at concentrations of 130 ggll in the <br /> sample collected from MW-3 and 25,000 µg/1 in the sample collected from MW-4. Benzene was detected at 2 µg11 <br /> in the sample collected from MW-4. MtBE was detected at concentrations of 2,300 µg11 in the sample collected <br /> from MW-3 and 1,100 µg11 in the sample collected from MW-4. Depth to water across the site increased an <br /> average ofapproximately 0.48 feet from the previous quarter. Groundwater flow was to the northeast at a gradient <br /> of approximately 0.001 to 0.002 ft/ft,generally consistent with historical data. <br /> LIMITATIONS: <br /> The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan,Inc. Gettler- <br /> Ryan's report is attached. The data presented in this summary is accurate only to the degree implied by the sources <br /> and methods used. No warranty,expressed or implied, is made by SECOR. <br /> If you have any questions,please feef free to call us at(916)861-0400. <br /> Sincerely, <br /> SECOR International Inc. <br /> Brian A. Silva <br /> Project Manager <br /> ATTACHMENTS: <br /> • Table I —Screen Intervals <br /> • Attachment A—August 26,2002 Groundwater Monitoring&Sampling Report by Gettler-Ryan Inc. <br /> cc: Bob Cochran,Chevron Products Company,P.O. Box 6004, San Ramon,CA 94583-0804 <br /> Marty Hartzell,RWQCB—CVR, 3443 Routier Road, Suite A,Sacramento,CA 95827 <br /> Joe Neely,Cambria,270 Perkins Street,P.O. Box 259, Sonoma,CA 95476 <br /> 4 <br />