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SECO <br /> INTER 30017 Kilgore Road Suite 100 <br /> INTERNATIONAL Rancho Cordova CA 95670 <br /> S E C ® R INCORPORATED 916-661-0400 TEL <br /> 916 661-0430 Fnx <br /> January 14, 2004 <br /> Mike Infurna <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Chevron Groundwater Monitoring Report(4Q2003) <br /> Chevron Station 9-1848 <br /> 1257 West Yosemite Avenue <br /> Manteca, California <br /> SECOR Protect No 77CH 00000 09 0006 <br /> Dear Mr Infurna <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company, Is providing this report to summarize the recently completed groundwater monitoring <br /> event at the above referenced site The site Is an active service station located at 1257 West <br /> Yosemite Avenue, Manteca, California <br /> • COMPLETED ACTIVITIES - FOURTH QUARTER 2003 <br /> • Conducted quarterly groundwater monitoring and sampling <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES — FIRST QUARTER 2004 <br /> • Conduct quarterly groundwater monitoring and sampling <br /> • Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> The quarterly monitoring and sampling was performed by Gettler-Ryan, Inc (G-R) This <br /> groundwater monitoring and sampling event was performed on October 24, 2003 G-R's <br /> groundwater monitoring report is Included as Attachment A Depth to groundwater across the site <br /> was approximately 20 feet below ground surface Groundwater elevation across the site decreased <br /> an average of 0 72 feet from the previous sampling event Groundwater flow was to the northeast at <br /> an approximate gradient of 0 005 ft/ft A summary of laboratory results are listed below <br /> 1 IChevron1918481Periodic Mondonng120031402003 91848 doc SECOR International Incorporated <br />