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� I <br /> May 13, 2002 SECOR <br /> Protect 77BP 64409 01 0034 <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—First 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 /> The summary report includes groundwater contour maps (Figures 1 and 2) and a <br /> groundwater concentration map (Figure 3), based on Gettler-Ryan Inc 's (GRI) <br /> groundwater monitoring report, which is included as Attachment A If you have <br /> questions or comments regarding this quarterly summary report, please do not hesitate <br /> to contact me at (916) 861-0400 <br /> Sincerely, <br /> R4FESStp <br /> SECOR International Inco gE A, 9�F <br /> LU LU NO C 058399 M <br /> Rusty E BenkoVPE, ��q��� ��E��r``� <br /> Senior Engine <br /> Enclosure Quarterly Summary Report—First Quarter 2002 <br /> Attachments Figure 1 —Shallow Zone Groundwater Elevation Contour Map <br /> Figure 2—Deep Zone Groundwater Elevation Contour Map <br /> Figure 3 —Groundwater Chemical Concentration Map <br /> Attachment A —GRI's, First Quarter Event of January 17, 2002 <br /> Groundwater Monitoring c& Sampling Report, Dated <br /> February 11, 2002 <br />_ cc Mr Ed Ralston, Phillips 66 Company <br /> Ms Mary 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 />