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li Chevron Groundwater Monitoring Report(2Q2001) Page 2 of 2 Facility 49-8632-575 Grant Line Road Tracy,CA Date July 13,2001 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on May 25,2001 Groundwater samples were collected from four wells and a sump during this event TPHd was detected in the samples collected from three of the wells at concentrations ranging from 75 pg/I in MW-2 to 530 pg/I in MW-3 TPHg was detected in samples collected from MW-2 at 630 pg/l, MW-3 at 2,000 pg/1 and MW-4 at 2,200 µg/I Benzene was detected in samples collected from three wells, at concentrations of 43 pg/I in MW-2, 64 pg/1 in MW-3,and 340 pg/l m MW-4 MtBE was detected in three of the four wells,at concentrations ranging from 27 p9/1 in MW-I to 780 pg/1 in MW-3 No TPHg, BTEX, or MtBE were detected in the sample from the sump Groundwater elevations increased by an average of 0 27 feet this quarter Groundwater flow was to the northwest at 0 005 ft/ft 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 William E Brasher, P E Project Manager ATTACHMENTS: • Attachment A---June 22,2001 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