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Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 Facility #9-1452—334 East Main Street,Ripon,California Date October 9,2002 • DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on August 2,2002 Nine wells were sampled during this event Benzene was not detected in any of the samples collected from the nine / wells TPHg was detected in samples collected from three of the wells at concentrations of 180 µg/1 in the sample collectedZffom MW-4, 1,000 µg/l in the sample collected from MW-5S,and 820 pgll in the sample collected from MW-6S `MtBE was detected in sa les collected from five of the wells at concentrations ranging from 4 µg/1 to the sample collected from MW-5D to 20,000 µg/l in the sample collected from MW-5SVDepth to water across the site Increased an average of approximately 148 feet from the previous sampling event Groundwater flow was to the southwest at 0 008 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 r" Brian Silva Project Manager ATTACHMENTS: • Attachment A—September 9,2002 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 Routier Road,Suite A, Sacramento,CA 95827 I