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SECOR www.secor.com <br /> s' f + T{ INTERNATIONAL <br /> LCA INCORPORATED 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> 916-861-0400TEL <br /> 03 JUL16 <br /> AM 11' 08 916-861-0430 FAX <br /> July 15, 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—Second 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), second 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 /> oQAOFES3s <br /> Sincerely, Q`� .�E.af�y q� <br /> SECOR International ncorporate k��� <br /> W NO.C 058399 mei <br /> �Zenkosky, <br /> Ev.usty . . s� <br /> Senior Engineer y�OFCCCAU40P��P <br /> RB/sh <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, RWQCB—Central Valley Region <br /> (:\ConocoPhillips\Tosco Marketing\4409\Qssrs\2Q2003_QSR.doc <br />