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Sequoia <br /> 404N Wiget Lane <br /> e uoia WalnutG(925)9 44598 <br /> S <br /> `1 {925)988-96DD <br /> Analytical FAX(425)988 9673 <br /> www Ecquoialabs can <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#2133,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 14-Aug-02 13 16 <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 2HO2008-EPA 3050B <br /> Blank(2H02008-BLK1) Prepared 02-Aug-02 Analyzed 06-Aug-02 <br /> Cadmium ND 050 mg/kg <br /> Chromium ND 050 " <br /> Lead 265 10 Q 19 <br /> Nickel ND 10 " <br /> Zmc ND 10 " <br /> LCS(2HO2008-BSI) Prepared 02-Aug-02 Analyzed 06-Aug-02 <br /> Cadmium 680 050 mg/kg 500 136 80-120 A-01 <br /> Chromium 656 050 500 131 80-120 A O I <br /> Lead 673 10 500 135 80-120 A-01 <br /> Nickel 662 10 500 132 80-120 A-01 <br /> Zinc 693 10 500 139 80-120 A-01 <br /> Matrix Spike(2H02008-MS1) Source W208022-01 Prepared 02-Aug-02 Analyzed 06-Aug-02 <br /> Cadmium 552 050 mg/kg 50 0 ND 110 80-120 <br /> Chromium 102 050 500 45 114 80-120 <br /> Lead 637 10 500 10 107 80-120 <br /> Nickel 976 10 500 48 992 80-120 <br /> Zinc 100 10 500 47 106 80-120 <br /> Matrix Spike Dup(2H02008-MSDI) Source W208022-01 Prepared 02-Aug-02 Analyzed 06-Aug-02 <br /> Cadmium 566 050 mg/kg 500 ND 113 80-120 250 20 <br /> Chromium 103 050 500 45 116 80-120 0 976 20 <br /> Lead 634 10 500 10 107 80-120 0 472 20 <br /> Nickel 946 10 Soo 48 932 80-120 312 20 <br /> Zinc 102 10 500 47 110 80-120 198 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 13 of 20 <br />