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4D (92404 N Wiget Lane <br /> Sequoia Walnut Crc&,CA 94598 <br /> iW Analytical <br /> 5)988 9600 <br /> FAX(925)988-9573 <br /> www sequoialabs c <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#4932,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 24-Jul-02 12 03 <br /> Total Metals by EPA 6000/7000 Series Methods -Quality Control <br /> Sequoia Analytical- Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 2F18004-EPA 3050B <br /> Blank(2F18004-BLK2) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> lead ND 10 mg/kg <br /> LCS(2F18004-BS2) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> Lead 521 10 mg/kg Soo 104 80-120 <br /> LCS Dup(2F18004-BSD2) Prepared 18-Jun-02 Analyzed 21-Jun-02 <br /> Lead 522 10 mg/kg 500 104 80-120 0 192 20 <br /> .+K <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 35 of 38 <br />