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SECOR www secor corn <br /> APR 1 0 2003INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> . ENVIRONMENT HEALTH 916 861 0430 FAX <br /> PERMIT/SERVICES <br /> April 8, 2003 <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 2003 <br /> SECOR Project No 77CP 64409 02 0001 <br /> Dear Mr Infurna <br /> On behalf of ConocoPhillips, SECOR International Incorporated Is forwarding the quarterly summary <br /> report for the following location <br /> Service Station Location <br /> Former Tosco (Unocal) Station #4409 1502 N EI Dorado Street, Stockton, CA <br /> Shallow and deep zone groundwater contour maps and a groundwater chemical concentration map <br /> are included as Figures 1, 2, and 3 Gettler-Ryan Inc (GRI), first quarter groundwater monitoring <br /> report is included as Attachment A Certified laboratory analytical reports, chain-of-custody <br /> documentation, and field data sheets for the Arco station, located at 16 East Harding Way, are <br /> Included as Attachment B <br /> If you have questions or comments regarding this quarterly summary report, please do not hesitate <br /> to contact me at(916) 861-0400 <br /> Sincerely, QPOrfcSSIONq� <br /> SECOR International Incorporated <br /> Ocoo KO C 05839W R 9 <br /> Rusty E Benkos , P E t Exp�, <br /> Senior Engineer sCM1- <br /> 11 <br /> 4f OF C \i�� <br /> RBlsh <br /> Figures Figure 1 —Groundwater Elevation Contour Map-Shallow Water Bearing Zone <br /> Figure 2 - Groundwater Elevation Contour Map-Deep Water Bearing Zone <br /> Figure 3—Groundwater Concentration Map <br /> Attachments Attachment A—Gettler-Ryan Fourth Quarter Groundwater Monitoring and Sampling <br /> Report <br /> Attachment B—Arco Fourth Quarter Certified Analytical Laboratory Reports, Chain- <br /> of-Custody Documentation, and Field Data Sheets <br /> cc Mr Ed Ralston, ConocoPhillips <br /> Mr Marty Hartzell, RWQC13—Central Valley Region <br /> 11ConocoPhdiips\Tosco Marketing1440910ssrs11Q2003_QSR doc <br />