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Chevron Groundwater Monitoring Report(3Q2001) Page 2 of 2 Facility #9-8632—575 Grant lane Road Tracy,CA Date October 8,2001 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 31,2001 Groundwater samples were collected from four wells and a sump during this event TPHd was not detected in any of the samples collected TPHg was detected in samples collected from MW-3 at 280 µg11 and MW-4 at 460 pg/l Benzene was detected in samples collected from two wells,at concentrations of 4 6 pg/I in MW-3 and 75 pg/l in MW-4 MtBE was detected in all of the four wells, at concentrations ranging from 8 1 µg11 in MW-4 to 140 pg/I in MW-2 using EPA Method 8015 The concentration of MtBE in the sample collected from MW-2 was confirmed, using EPA Method 8260, at 160 pg/l No TPHg, BTEX,or MtBE were detected in the sample collected from the sump Depth to water in the monitoring wells increased by an average of 0 31 feet this quarter Groundwater flow was to the northwest at 0 007 ft/ft,consistent with previous monitoring events 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 Internattanal Inc a4�1 f William E Brasher, P E Project Manager ATTACHMENTS: Attachment A—August 30,2001 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 Routier Road, Suite A, Sacramento, CA 95827 Rudy Sanchez, Tracy Express Wash& Lube,2480 Tracy Boulevard,Tracy, CA 95376 Stella Rickman, P O Box 244,Tracy,CA 95378 Kathryn Pudenz,4350 Kirkham Street, Apt 304, San Francisco, CA 94122 i