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t'tc%nrnt(iroLlIId%�MCI %Ionaming Report(4Q2001} Page 2 a!'2 I acilith n1)-(64;7 1 3')South('cn(cr Street,Stockton.('A tate January 31,2001 DISCISSION: Groundwater monitoring and sampling was performed by Gettler-Ryan Inc. on October I" and 2nd, 2001 and November 13, 2001. Twelve wells were sampled during each of these events. Samples collected from the twelve wells on October I and '_. 2001 were analyzed for TPHg, BTEX, and MtBE by EPA Method 8020. Samples Collected from the twelve wells on November 13,2001 were analyzed for fuel oxygenates and lead scavengers by FPA Method 8260. TPHg was detected in samples collected from four of the twelve wells at concentrations ranu,in- from 98 pg l in the sample collected from MW-2 to 78,000 pg,,] in the sample collected from MW-9. Benzene was detected in samples collected from four of the wells at concentrations ranging from 2.1 pg/l in the samplc collected from MW-2 to 6,100 µg'1 in the sample collected from MW-9. MtBE was not detected in any of the samples collected during either of the two events. 1, 2-DCA was detected in the sample collected from MW-3 tit a concentration of 3 pg:`l. TBA and EDB were detected in the sample collected from MW-9S at concentrations of 350 }H' I and 280 pg1, respectively. Depth to water in the monitoring wells across the site increased an average of approximately 0.78 feet from the previous quarter. Groundwater flow was to the southeast at gradients of 0.002 to 0.003 It fit. consistent with historical data. LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc. Gettier- 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. It",OU have any questions, please feel free to call us at(9 16) 861-0400. • Sincerely, SECOR International Inc. William E. Brasher, P.E. Project Manager ATTACHMENTS: • Attachment A — December 18, 2001 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