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a <br /> Chevron Groundwater Monitoring Report(4Q2001) Page 2 of 2 <br /> 1 aulrty 49-8264—3775 Tracy 130ulevard 3 racy CA Datc January 18,2002 <br /> DISCUSSION <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 24, 2001 Four <br /> wells were sampled during this event TPHd was detected at a concentration of 51 p,,/l in the sample collected from <br /> MW-2, 80 tig/l in the sample collected from MW-3, and 3,100 tig/l in the sample collected from MW-4 TPHg was <br /> detected in the sample collected from MW-3 at a concentration of 490 pg/l and in the sample collected from MW-4 <br /> at a concentration of 15,000 pg/l MtBE was detected at a concentration of 4 7 µg11 in the sample collected from <br /> MW-2, at a concentration of 6,200 jug/I in the sample collected from MW-3, and at a concentration of 590 µg/l in <br /> the sample collected from MW-4 The concentration of MtBE in the sample collected from MW-3 was confirmed <br /> using EPA Method 8260, at 6,300 jag/l Depth to water across the site decreased an average of approximately 0 07 <br /> feet trom the previous quarter Groundwater flow was to the northeast at a gradient of approximately 0 001 to <br /> 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 feel free to call us at(916) 861-0400 <br /> Sinceiely, <br /> SECOR International Inc <br /> William E Brasher, P E <br /> Project Manager <br /> ATTACHMENTS: <br /> • Table I —Screen Intervals <br /> • Attachment A— December 3,2001 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 0 Box 259, Sonoma, CA 95476 <br />