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PI <br /> SECOR <br /> • May 13, 2002 International Incorporated <br /> } Project 77BP 61205 00 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 /> Tosco Service Station#1205 16470 Cambridge Street, Lathrop, CA <br /> The summary report includes a groundwater contour map (Figure 1) and groundwater <br /> concentration map (Figure 2), based on Gettler-Ryan Inc 's (GRI) groundwater <br /> monitoring report, which is included as Attachment A If you have questions or <br /> comments regarding this quarterly summary report, please do not hesitate to contact me <br /> at (916) 861-0400 <br /> Sincerely, <br /> pP0fESS1p�L <br /> SECOR International Incorpo <br /> X10 C 058399 m� <br /> �} cc <br /> Exp = Z <br /> Rusty E Benk y, P Eo�ALP <br /> 1 �4Q`�` <br /> Senior Engine <br /> Enclosure Quarterly Summary Report—First Quarter 2002 <br /> Attachments Figure 1 —Groundwater Elevation Contour Map—January 29, 2002 <br /> Figure 2— Groundwater Concentration Map—January 29, 2002 <br /> Attachment A—GRI's, First Quarter Event of January 29, <br /> 2002 Groundwater Monitoring & Sampling Report, <br /> Dated February 15, 2002 <br /> cc Mr Ed Ralston, Phillips 66 Company <br /> Mr Warren Hartzell, RWQCB —Central Valley Region <br /> 3017 Kilgore Road, suite 100, Rancho Cordova CA 95670 916 861 0400 916 861 0430 Fax www secor cam <br />