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d f Chevron Groundwater Monitoring Report(4Q2001) Page 2 of 2 Facility #9-6171 —6633 Pacific Avenue,Stockton,CA Date January 2,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 11,2001 Ten wells were monitored and sampled TPHg was detected in eight of the ten wells sampled at concentrations ranging from 60 gg/I in the sample collected from MW-14 to 1800 pg/l in the sample collected from MW-7 Benzene was detected in three wells at concentrations of 1 µg/l in the sample collected from MW-2, 1 1 pg/1 in the sample collected from MW-6, and 0 56 pg/l in the sample collected from MW-IID MtBE was detected in samples collected from two wells at concentrations of 4 8 pg/I in MW-6, and 560 pg/I in MW-8 The MtBE concentrations were confirmed through analysts by EPA Method 8260 Results of the confirmation analysts were less than the method detection limit of 2 0 pg/l in the sample collected from MW-6, and 670 pg/I in the sample collected from MW-8 MW-3, MW-5, and MW-9 were inaccessible due to cars parked over the wells Groundwater elevations increased across the site an average of approximately 0 74 feet this quarter Groundwater flow was calculated to be to the east at approximately 0 002 ft/ft LIMITATIONS: I The findings presented to 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 Ro r Hoffmo Project Manager ATTACHMENTS• • Table 1 —Screen Intervals • Attachment A—November 14, 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 Wilbur Smith ll, Sims-Grupe Management, 374 Lincoln Center, Stockton, CA 95207 Donald Bradshaw, Levine-Fricke-Recon, 1900 Powell Street, 12" Floor, Emeryville, CA 94608-1827 I I I I