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Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 <br /> Facility #9-1848—1257 Yosemite Avenue,Manteca,CA bate October 30,2002 <br /> DISCUSSION: <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on July 18,2002 Three <br /> wells were sampled during this event MtBE concentrations were reported in the sample collected from well C-2 at <br /> 50 micrograms per liter(µg/1) Groundwater elevations across the site decreased an average of approximately 3 12 <br /> feet this quarter Groundwater flow was calculated to be to the northeast at approximately 0 01 Rift,consistent with <br /> historical data <br /> LIMITATIONS: <br /> The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc Gettler- <br /> Ryan's report is attached The data presented in this summary is accurate only to the degree implied by the sources <br /> and methods used No warranty,expressed or implied, is made by SECOR <br /> If you have any questions, please feel free to call us at(916)861-0400 <br /> Sincerely, <br /> SECOR International Inc <br /> • Rag Hoffmor <br /> Project Manager <br /> ATTACHMENTS: <br /> • Table I —Screen Intervals <br /> • Attachment A—August 26,2002 Groundwater Monitoring&Sampling Report by Gettler-Ryan Inc <br /> cc Bob Cochran,CEMC, P O Box 6004, San Ramon, CA 94583-0804 <br /> Marty Hartzell,RWQCB-CVR,3443 Routter Road, Suite A, Sacramento,CA 95827 <br /> Chase/Parker Corp,Rodney A Chase, 11911 San V incente Blvd, Suit 300, L A ,Ca 90049 <br /> Terri Roche, Pan Pacific Retail Properties, 8785 Center Parkway, Suite B-350, Sacramento,CA 95823 <br />