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i► r Chevron Groundwater Monitoring Report(1Q2002) Page 2 of 2 Facility tl9-6171 —6633 Pacific Avenue,Stockton CA Date April 1,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on January 10, 2002 Thirteen wells were monitored and sampled TPHg was detected in nine of the wells sampled at concentrations ranging from 51 µg/1 in the sample collected from MW-14 to 1,300 µg/l in the sample collected from MW-7 Benzene was detected in two wells at concentrations of 0 64 pg/l in the sample collected from MW-6 and 2 6 µg11 in the sample collected from MW-2 MtBE was detected in the sample collected from MW-8 at a concentration of 53 pg/l in The MtBE concentration was confirmed through analysis by EPA Method 8260 Results of the confirmation analysis were 52 pg/l Groundwater elevations decreased across the site an average of approximately 1 78 feet this quarter Groundwater flow was calculated to be to the east at approximately 0 01 ft/ft 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 kJU�� Ro r Ho mo Project Manager ATTACHMENTS: • Table 1 —Screen Intervals • Attachment A—February 5,2002 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 Wilbur Smith II, Sims-Grupe Management, 374 Lincoln Center, Stockton, CA 95207 Donald Bradshaw, Levine-Fricke-Recon, 1900 Powell Street, 12" Floor, Emeryville, CA 94608-1827