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885 Jarvis Dr <br /> Sequoia Margin Hill,CA 95037 <br /> . a_ _� (408)776-9600 <br /> TAW A. ly +�c aR FAX(408)782-6308 <br /> www.sequoialabs.can <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0827 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 13:36 <br /> Ferrous Iron by Hach method 814611;10 Phenanthroline Method- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L31006-General Preparation <br /> Blank(2L31006-BLK 1) Prepared&Analyzed: 12/24/02 <br /> Ferrous Iron ND 0.10 mg/1 <br /> Laboratory Control Sample(2L31006-BSI) Prepared&Analyzed: 12/24/02 <br /> Ferrous Iron 0.416 0.10 mall 0.400 104 87-118 <br /> Matrix Spike(2L31006-MSI) Source:MLL0827-06 Prepared&Analyzed: 12/24/02 <br /> Ferrous Iron 0.541 0.10 mgll 0.400 ND 135 87-118 HT-04,QM-0 <br /> 7 <br /> Matrix Spike Dup(2L31006-MSDI) Source:MLL0827-06 Prepared&Analyzed: 12/24/02 <br /> Ferrous Iron 0.558 0.10 mgll 0.400 ND 140 87-118 3.09 8 HT-04,QM-0 <br /> 7 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> 0 custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 14 of 18 <br />