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Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 Facility #9-3232—8660 Lower Sacramento Road,Stockton,CA Date October 9,2002 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 25,2002 Groundwater samples were collected from ten wells during this event TPHg was detected in samples collected from three of the ten wells, at concentrations of 2,400 pg/l in the sample collected from MW-2, 17,000 µg/1 in the sample collected from MW-4D,and 340 pg/l in the sample collected from MW-51) Benzene was detected in samples collected from four of the ten wells, at concentrations ranging from 2 µg/l in the samples collected from MW-5D and MW-7 to 3,300µgll in the sample collected from MW-4D MtBE was detected in samples collected from two of the ten wells, at concentrations of 4µg/1 in the sample collected from MW-3 and 6 pg/I in the sample collected from MW-4D Depth to water across the site increased by an average of approximately 7 24 feet from the previous quarter The groundwater flow direction was to the southeast at 0 001 to 0 003 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 las at(916)861-0400 Sincerely, SECOR International Inc Brian Silva Project Manager ATTACHMENTS: Attachment A—September 3,2002 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc cc Bob Cochran,Chevron Environmental Management Company, P O Box 6004, San Ramon, CA 94583 Marty Hartzell, RWQCB-CVR,3443 Routter Road, Suite A, Sacramento,Ca 95827 Richard Berger, Berger&Company,667 East Canal Drive, Turlock, CA 95380-4095