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l Chc.vron(Jr0U[1dWater Monitoring Report(4Q2001) Page 2 o1 2 1.icility 49-3232—8660 Lower Sac ranxnto Road Stockton,CA Dat(, January 18 2001 DISCUSSION This groundwatet monitoring and sampling event was performed by Gettler-Ryan Inc on October 24,2001 Groundwater samples were collected from three wells during this event TPHg was detected in samples collected trom all three wells,at concentrations of 70 fig/l in MW-1, 5,000 pg/l In MW-2, and 1,500 µg/l In MW-3 Benzene was detected at concentrations of 320 Lig/1 in the sample collected from MW-2 and 190 pg/1 in the sample collected from MW-3 MtBE was detected in the sample collected from MW-3 at a concentration of 16 pg/l, analyzed using EPA Method 8260 Tertiary butyl alcohol was also detected in the sample collected from MW-3 at a concentration of 130 pgll using EPA Method 8260 Depth to water across the site increased an average of approximately 1 47 feet from the previous quarter The groundwater flow direction was to the south at 0 004 ft/ft, consistent with the previous monitoring event 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 aa S //� William E Brasher, P E Project Manager ATTACHMENTS. • Attachment A—November 26, 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 Richard Berger, Berger&Company, 667 East Canal Drive,Turlock, CA 95380-4095