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SECOR wwwsecor.com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C 1\ INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861.0400 TsL <br /> 916-861.0430 FAX <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(402003) <br /> Chevron Station 9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.09.0017 <br /> Dear Mr. Infurna: <br /> SECOR International Incorporated is providing this report to summarize the recently <br /> completed groundwater monitoring event at the above referenced site. The site is a Chevron service <br /> station located at 6633 Pacific Avenue, Stockton, 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 23 & 24, 2003. G-R's <br /> groundwater monitoring report is included as Attachment A. Depth to groundwater across the site <br /> was approximately 39 feet below ground surface. Groundwater elevation across the site decreased <br /> an average of 3.87 feet from the previous sampling event. Groundwater flow was to the southeast at <br /> an approximate gradient of 0.003 to 0.07 ft/ft. A summary of laboratory results are listed below. <br /> llkww <br /> 1.1ChevroM96171 Feriodic Monitoring120031402003 OMR 96171.doc SECOR International incorporated <br />