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r � <br /> Chevron Groundwater Monitoring Report(302002) Page 2 of 2 <br /> Facility #9-8632—575 Grant Line Road Tracy,CA Date October 9,2002 <br /> i <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 30,2002 <br /> Groundwater samples were collected from eight wells during this event TPHd was detected in three of the samples <br /> collected at concentrations of 120 pg/l in the sample collected from MW-3, 210 µg/1 in the sample from MW-5, and <br /> 280 µg11 in the sample collected from MW-6B TPHg was detected in three of the samples at concentrations of <br /> 71µg I in the samples collected from MW-6A, 220 pg/l in the sample collected from MW-613,and 470 µg/1 in the <br /> sample collected from MW-3 Benzene was detected in two of the samples at concentrations of 1µg11 in the sample <br /> collected from MW-4 and 9µg/I in the sample collected from MW-3 MtBE was detected in five of the samples at <br /> concentrations ranging from 3 µg/1 in the samples collected from MW-4 and MW-6A to 460 µg1I in the sample <br /> collected from MW-3 Depth to water in the monitoring wells increased by an average of 0 37 feet from the <br /> previous quarter Groundwater flow was to the northwest at 0 006 ft/ft,consistent with previous monitoring events <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 /> i <br /> Brian Silva <br /> Project Manager <br /> ATTACHMENTS: <br /> • Attachment A—September 6,2002 Groundwater Monitoring&Sampling Report by Gettler-Ryan Inc <br /> cc Bob Cochran,Chevron Environmental Management Company,P O Box 6004, San Ramon,CA 94583 <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 /> Robert Kttay, Aquascience,208 West El Pintado Road,Danville,CA 94526 <br />