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04 N <br /> Laile <br /> Sequoia Walnut 4GOreeek,CA 94598 W�ge945% <br /> 4—D— <br /> (925)988-9603 <br /> Analytical <br /> FAX(916)988-9673 <br /> www segioialabs c <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Protect Number Arco#4932 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03-Jul-02 18 29 <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 %REC Limas RPD Limit Notes <br /> Batch 2F18004-EPA 3050B <br /> Blank(2Fi8004-BLK1) Prepared 18-Jun-02 Analyzed 19-Jun-02 <br /> Lead ND 10 mg/kg <br /> Blank(2F18004-BLK2) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> Lead ND 10 mg/kg <br /> LCS(2F18004-BS1) Prepared 18-Jun-02 Analyzed 19-Jun-02 <br /> Lead 560 10 mg/kg 500 112 80-120 <br /> LCS(2F18004-BS2) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> Lead 521 10 mg/kg 500 104 80-120 <br /> LCS Dup(2F18004-BSD1) Prepared 18-Jun-02 Analyzed 19-Jun-02 <br /> Lead 560 10 mg/kg 500 112 80-120 000 20 <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 /> 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 in its entirety <br /> Page 6 of 7 <br />