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Chevron Quarterly Groundwater Monitoring Report(2Q2000) Page 2 of 2 Facility #9-8632—575 Grant Line Road Tracy,CA Date November 10,2004 i DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on June 26,2000 Four wells were sampled during this event TPHd was reported in all the wells at concentrations ranging from 59 8 ppb m MW-2 to 151 ppb m MW-3 TPHg was reported in three wells at concentrations of 240 ppb in MW-2, 530 ppb in MW-4,and 760 ppb in MW-3 Benzene was reported in three wells at concentrations of 20 ppb in MW-2,44 ppb in MW-3, and 220 ppb in MW-4 MtBE was reported in all the wells at concentrations ranging from 21 ppb in MW-4 to 350 ppb in MW-3 Analytical results for this quarter show an increase in concentrations in MW-2, and a decrease in MW-I, MW-3,and MW-4 Groundwater elevations across the site decreased an average of approximately 0 47 feet this quarter Groundwater flow was to the northwest at 0 003 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 Roge Hoffmore Project Manager ATTACHMENTS: • Attachment A—October 18, 2000 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 Greg Gurss, Gettler-Ryan Inc ,3164 Gold Camp Drive, Suite 240 Rancho Cordova, CA 95670