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Chevron Groundwater Monitoring Report(I Q2002) Page 2 of 2 <br /> Facility: 49-0557- 139 South Center Street,Stockton,CA Date. April 5,2002 <br /> DISCUSSION: <br /> Groundwater monitoring and sampling was performed by Gettler-Ryan Inc. on .January 30`h and 31", 2002_ <br /> Fourteen wells were sampled during this event. TPHg was detected in samples collected from nine of the fourteen <br /> wells at concentrations ranging from 52 gg/l in the sample collected from MW-4 to 200,000 pg/l in the sample <br /> collected from MW-9S. Benzene was detected in samples collected from nine of the wells at concentrations <br /> ranging from 1.0 gg/l in the sample collected from MW-3 to 25,000 gg/l in the sample collected from MW-9S. <br /> MtBE was not detected in any of the samples collected during this event_ 1,2-DCA and EDB were detected in the <br /> sample collected from MW-9S at concentrations of 930 ggd and 380 pg/l, respectively. TPHd was detected in <br /> samples collected from twelve of the wells at concentrations ranging from 190 gg/l in the samples collected from <br /> MW-4 and MW-6 to 240,000 gg/l in the sample collected from MW-9. TPHmo was detected in samples collected <br /> from four of the wells at concentrations ranging from 1,400 gg/I in the sample collected from MW-10 to 38,000 <br /> pg/1 in the sample collected from MW-9. Depth to water in the monitoring wells across the site decreased an <br /> average of approximately 0.76 feet from the previous quarter. Groundwater flow was to the southeast at gradients <br /> of 0.001 to 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—March 11, 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 />