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404 N W ige t Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> eT) (925)988 9600 <br /> Analytical FAX(925)988-9673 <br /> www woialabs 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 /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R-EC Limits RPD Limit Notes <br /> Batch 2HO6002-EPA 3550A Sonicate <br /> Blank(2H06002-BLK1) Prepared&Analyzed 06-Aug-02 <br /> TRPH ND 50 mg/kg <br /> LCS(2H06002-BSI) Prepared&Analyzed 06-Aug-02 <br /> TRPH 485 50 mg/kg 500 970 70-130 <br /> LCS Dup(2H06002-BSD1) Prepared&Analyzed 06-Aug-02 <br /> TRPH 492 50 mg/kg 500 984 70-130 1 43 30 <br /> Matrix Spike(2H06002-MS1) Source W208041-01 Prepared&Analyzed 06-Aug-02 <br /> TRPH 499 50 mg/kg 500 ND 998 60-140 <br /> Matrix Spike Dup(2H06002-MSD1) Source W208041-01 Prepared&Analyzed 06-Aug-02 <br /> TRPH 499 50 mglkg 500 ND 998 60-140 000 30 <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 18 of 20 <br />