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885 Jarvis Dr <br /> Sequoia Mcrgan Hill,CA 95037 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tus Environmental Inc. Project: ARCO#5469,Stockton,CA MMA0406 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO 45469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/11/03 14:07 <br /> Ferrous Iron by mach method 8146/1;10 Phenanthroline Method -Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %P-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A20019-General Preparation <br /> Blank(3A20019-BLK1) Prepared&Analyzed: 01/16/03 <br /> Ferrous Iron ND 0.10 mg/l <br /> I <br /> j Laboratory Control Sample(3A20019-BS1) Prepared&Analyzed: 01/16/03 <br /> Ferrous Iron 0.383 0.10 mg/1 0.400 95.8 87-118 <br /> Matrix Spike(3A20019-MSI) Source:MMA0406-10 Prepared&Analyzed: 01/16/03 <br /> Ferrous Iron ND 0.10 mg/l 0.400 ND 87-118 QM-07 <br /> i <br /> Matrix Spike Dup(3A20019-MSDI) Source:MMA0406-10 Prepared&Analyzed: 01/16/03 <br /> Ferrous Iron ND 0.10 mg/1 0.400 ND 87-118 8 QM-07 <br /> i <br /> 0oia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 31 of 34 <br />