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Chevron Groundwater Monitorma Report(4Q2001) Pagc 2 of 2 <br /> 1 ieihty H9-8632—575 Grant Linc Road Tracy CA Date. January 18 2002 <br /> DISCUSSION. <br /> Tilts groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 30, 2001 <br /> Groundwater samples were collected from four wells during this event TPHd was detected in the sample collected <br /> from MW-3 at a concentration of 63 4tg/l TPHg was detected in the sample collected from MW-1 at a <br /> concentration of 140 pg/l, in the sample collected from MW-3 at a concentration of 780�[gd, and in the sample <br /> collected from MW-4 at a concentration of 74 µg11 Benzene was detected in all four of the samples collected,at <br /> concentrations ranging from 0 58 ug/l in the sample collected from MW-2 to 14 µg/l in the sample collected from <br /> MW-4 MtBE was detected to all four of the wells, at concentrations ranging from 19 pg/I in the sample collected <br /> from MW-4 to 130 µg/i in the sample collected from MW-2 using EPA Method 8020 The concentration of MtBE <br /> in the sample collected from MW-2 was confirmed, using EPA Method 8260,at 140 fig/l Depth to water in the <br /> monitoring wells decreased by an average of 0 35 feet from the previous quarter Groundwater flow was to the <br /> northwest at 0 004 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 /> it <br /> Sincerely, <br /> SECOR International Inc <br /> William E Brasher, P E <br /> Project Manager <br /> ATTACHMENTS <br /> Attachment A—December 10, 2001 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 /> Kathiyn Pudenz,4350 Kirkham Street, Apt 304, San Francisco,CA 94122 <br /> • <br />