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45 <br /> Chevron Quarterly Groundwater Monitoring Report(4Q2000) Page 2 of 2 <br /> Facility #9-8632—575 Grant Line Road Tracy,CA Date January23 2001 <br /> • DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 31, 2000 Four <br /> wells and a sump were sampled during this event TPHd(unidentified hydrocarbons>C16)and TPHg were <br /> reported in all four wells TPHd was reported at concentrations ranging from 160 ppb in MW-4 to 330 ppb in MW- <br /> 2 TPHg was reported at concentrations ranging from 74 0 ppb in MW-I to 3,250 ppb in MW-4 Benzene was <br /> reported in three wells at concentrations of 58 8 ppb in MW-3, 129 ppb in MW-2,and 380 ppb in MW-4 MtBE <br /> was reported in two wells at concentrations of 37 0 ppb in MW-1 and 430 ppb in MW-2 A sample from the sump <br /> was reported non detectable for TPHg,BTEX, and MtBE except for 0 958 ppb toluene Analytical results for this <br /> quarter show a general increase in concentrations in MW-I, MW-2,and MW-4, and a decrease in concentrations in <br /> well MW-3 Groundwater elevations increased by an average of 0 43 feet this quarter Groundwater flow was to <br /> the northwest at 0 004 ft/ft <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 /> Sincerely, <br /> SECOR International Inc <br /> colt Gable <br /> Senior Geologist <br /> ATTACHMENTS: <br /> Attachment A—December 8,2000 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 /> Rudy Sanchez,Tracy Express Wash&Lube,2480 Tracy Boulevard, Tracy, CA 95376 <br /> Stella Rickman, P O Box 244, Tracy,CA 95378 <br /> Kathryn Pudenz,4350 Kirkham Street,Apt 304, San Francisco,CA 94122 <br />