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Chevron Groundwater Monitoring Report(2Q2002) Page 2 of 2 <br /> Facility #9-8632—575 Grant Line Road Tracy,CA Date July 1,2002 <br /> • <br /> DISCUSSION• <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on April 30,2002 <br /> Groundwater samples were collected from seven wells during this event TPHd was detected in all seven samples <br /> collected at concentrations ranging from 63 µg11 in the sample collected from MW-4 to 530 µg11 in the sample <br /> collected from MW-7 TPHg was detected in six of the samples at concentrations ranging from 230 µg11 in the <br /> sample collected from MW-4 to 1,300 µg/l in the sample collected from MW-7 Benzene was detected in four of <br /> the samples at concentrations ranging from 27 µg/l in the sample collected from MW-7 to 73 gg/l in the sample <br /> collected from MW-4 MtBE was detected in five of the samples at concentrations ranging from 4µg/l in the <br /> sample collected from MW-6 to 890 ggll in the sample collected from MW-3 The MtBE detection in the sample <br /> collected from MW-3 was confirmed using EPA Method 8260 at a concentration of 730 µg/l Depth to water in the <br /> monitoring wells increased by an average of 0 4 feet from the previous quarter Groundwater flow was to the <br /> 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 /> 1 <br /> Bri ilea <br /> Project Manager <br /> ATTACHMENTS: <br /> Attachment A—June 7,2002 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 /> Robert Kitay,Aquascience,208 West EI Pintado Road,Danville, CA 94526 <br />