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rl y <br /> Chevron Groundwater Monitoring Report(1 Q2002) Page 2 of 2 <br /> Facility #9-8632—575 Grant Line Road Tracy,CA Date April 15,2002 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on January 29, 2002 <br /> Groundwater samples were collected from four wells during this event TPHd was detected at concentrations of <br /> 150 pg/l in the sample collected from MW-1, 79 pg/1 in the sample collected from MW-3, and 59 pg/I in the sample <br /> collected from MW-4 TPHg was detected at concentrations of 150 µg/I in the sample collected from MW-2, 610 <br /> kg/l in the sample collected from MW-3, and 680 leg/1 in the sample collected from MW-4 Benzene was detected <br /> at concentrations of 22 pg/l in the sample collected from MW-2, 19 pg/I in the sample collected from MW-3, and <br /> 200 pg/1 in the sample collected from MW-4 MtBI;was detected in all four of the wells at concentrations ranging <br /> from 15 lig/I in the sample collected from MW-1 to 100 pg/l in the sample collected from MW-3 using EPA <br /> Method 8020 The MtBE concentration in the sample collected from MW-3 was confirmed using EPA Method <br /> 8260 at a concentration of 97 leg/l Depth to water in the monitoring wells decreased by an average of 0 43 feet <br /> from the previous quarter Groundwater flow was to the northwest at 0 005 ft/ft, consistent with previous <br /> 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 /> r� r <br /> Bnan Silva <br /> Project Manager <br /> ATTACHMENTS: <br /> • Attachment A--February 28, 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 /> i <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 El Pintado Road, Danville, CA 94526 <br />