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z Chevron Groundwater Monitoring Report(2Q2002) Page 2 of 2 Facility #9-0557— 139 South Center Street,Stockton,CA Date: June 28,2002 DISCUSSION: Groundwater monitoring and sampling was performed by Gettler-Ryan Inc. on April 15'h and 16a',2002. Thirteen wells were sampled during this event. MW-12 was not accessible for sampling during this event. TPHg was detected in samples collected from five of the thirteen wells at concentrations ranging from 770µg11 in the sample collected from MW-10 to I80,000µg11 in the sample collected from MW-9S. TPHd was detected in samples collected from eleven wells at concentrations ranging from 140 gg/I (MW-4) to 39,000µg/1 (MW-9S). TPHmo was detected in samples collected from three wells at concentrations ranging from 3,700µg/1 (MW-9)to 11,000µg11 (MW-9A). Benzene was detected in samples collected from five of the wells at concentrations ranging from 0.93 9g/1 in the sample collected from MW-2 to 16,000 µg/1 in the sample collected from MW-9S. MtBE was not detected in any of the samples collected during this event. TBA was detected in the samples collected from MW-9, MW-9A, and MW-9S at concentrations of 160µg/1, 140 pg/l,and 360 gg/l, respectively. 1,2-DCA and EDB were detected in the sample collected from MW-9S at concentrations of 940 9g11 and 320µg/l, respectively. Depth to water in the monitoring wells across the site increased an average of approximately 0.03 feet from the previous quarter. Groundwater flow was to the southeast at a gradient of 0.002 ft/ft, consistent with historical data. LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc. Gettler- Ryan's report is attached. The data presented in this summary is accurate only to the degree implied by the sources and methods used. No warranty,expressed or implied, is made by SECOR. If you have any questions,please feel free to call us at(916) 861-0400. Sincerely, SECOR International Inc. J ell William E. Brasher,P.E. Project Manager ATTACHMENTS: • Attachment A—May 24,2002 Groundwater Monitoring&Sampling Report by Gettler-Ryan Inc. cc: Bob Cochran,Chevron Products Company,P.O.Box 6004, San Ramon,CA 94583-0804 Marty Hartzell,RWQCB—CVR,3443 Routier Road, Suite A,Sacramento,CA 95827 Greyhound Lines,P.O.Box 660362,Dallas TX 75266-0362