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Chevron Groundwater Monitoring Report(3Q2001} Page 2 of 2 <br /> Facility: #9-0557— 139 South Center Street,Stockton,CA Date: October 8,2001 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc. on July 16,2001. Nine wells <br /> were sampled during this event. TPHg was detected in samples collected from three of the nine wells at <br /> concentrations of 110 pg/l in the sample collected from MW-2,3,800 µg11 in the sample collected from MW-7,and <br /> 74,000 pg/l in the sample collected from MW-9. Benzene was detected in samples collected from three of the wells <br /> at concentrations of 3.2 pg/I in the sample collected from MW-2, 74 pg/l in the sample collected from MW-7, and <br /> 4,300 pgll in the sample collected from MW-9. MtBE was not detected in any of the samples collected. TPHd was <br /> detected in the sample collected from MW-4 at 94 pg/I. TPH as motor oil was detected in samples collected from <br /> MW-2 (620 µg11), MW-5 (120 µg11), MW-7(340 pg/l), and MW-9 (17,000 pg/I). Depth to water in the monitoring <br /> wells across the site increased an average of approximately 0.77 feet this quarter. Groundwater flow was to the <br /> southeast at gradients of 0.002 ft/ft,consistent with historical data. <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 /> William E. Brasher, P.E. <br /> Project Manager <br /> ATTACHMENTS: <br /> • Attachment A—August 3,2001 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 /> Greyhound Lines, P.O. Box 660362, Dallas TX 75266-0362 <br />• <br />