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1 <br /> SECOR <br /> September 26, 2002 SERVICE- International Incorporated <br /> Project 77BP 64409 010034 <br /> AM 9. 54 <br /> Mr Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Summary Report—Third Quarter 2002 <br /> Dear Mr Infurna <br /> On behalf of Tosco Corporation, a subsidiary of Phillips Petroleum Company, SECOR <br /> International Incorporated is forwarding the quarterly summary report for the following <br /> location <br /> Service Station Location <br /> Former Tosco (Unocal) Station#4409 1502 N El Dorado Street, Stockton, CA <br /> Shallow and deep zone groundwater contour maps and a groundwater chemical <br /> concentration map composed by Gettler-Ryan Inc (GRI), are included in GRI's <br /> groundwater monitoring report (Attachment A) If you have questions or comments <br /> regarding this quarterly summary report, please do not hesitate to contact me at (916) <br /> 861-0400 <br /> Sincerely, <br /> SECOR International <br /> 7 <br /> Rusty E Benkosky, P E <br /> Senior Engineer <br /> Enclosure Quarterly Summary Report—Third Quarter 2002 <br /> Attachments Attachment A—GRI's, Third Quarter Event of July 11, 2002 <br /> Groundwater Monitoring & Sampling Report, Dated <br /> September 9, 2002 <br /> cc Mr Ed Ralston, Phillips 66 Company <br /> Mr Marty Hartzell, RWQCB — Central Valley Region <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax www secor com <br />