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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> Mk--%7-0 www sequoialabs com <br /> Secor-Rancho Cordova Project BP <br /> 3017 Kilgore Rd,Ste #100 Project Number BP#595,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01-Jul-02 07 59 <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 Limits RPD Limit Notes <br /> Batch 21F27011-EPA 3050B <br /> Blank(2F27011-BLKI) Prepared 27-Jun-02 Analyzed 29-Jun-02 <br /> Lead ND 10 mg/kg <br /> Blank(2F2701I-BLK2) Prepared 28-Jun-02 Analyzed 29-Jun-02 <br /> Lead ND 10 mgAg <br /> LCS(2F27011-BSI) Prepared 27-Jun-02 Analyzed 29-Jun-02 <br /> Lead 518 10 mg/kg 500 104 80-120 <br /> LCS(2F27011-BS2) Prepared 28-Jun-02 Analyzed 29-Jun-02 <br /> Lead 518 1 0 mg/kg 500 104 80-120 <br /> LCS Dup(2F27011-BSD1) Prepared 27-Jun-02 Analyzed 29-Jun-02 <br /> Lead 488 l 0 mg/kg 500 97 6 80-120 596 20 <br /> Matrix Spike(2F27011-MSI) Source W206264-01 Prepared 27-Jun-02 Analyzed 28-Jun-02 <br /> Wad 639 1 0 mg/kg 500 64 115 80 120 <br /> Matrix Spike Dup(2F27011-MSD1) Source W206264-01 Prepared 27-Jun-02 Analyzed 28-Jun-02 <br /> Lead 63 2 10 mg/kg 500 64 114 80-120 1 10 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 5 of 6 <br />