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$85 Jarvis Dr <br /> SeqI1[)I.a Morgan Hill,CA 776 9037 <br /> 00 <br /> AIta���ICa� (408)776-9600 <br /> . FAX(408)782-6308 <br /> www.sequoialabscom <br /> Stratus Environmental Inc. Project: ARCO 45469,Stockton,CA MMC0495 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: Arco 45469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/28/03 15:43 <br /> Ferrous Iron by Hach method 8146/1;10 Phenanthroline Method - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> [Analyte Result Limit Units Level Result %RBC Limits RPD Limit Notes <br /> Batch 3C25012-General Preparation <br /> Blank(3025012-BLKI) Prepared&Analyzed:03/11/03 <br /> Ferrous Iron ND 0,10 mg/l <br /> Laboratory Control Sample(3C25012-BS1) Prepared&Analyzed:03/11/03 <br /> Ferrous Iron 0.406 0.10 mgll 0.400 102 87-118 <br /> Matrix Spike(3C25012-MSI) Source:MMC0495-02 Prepared&Analyzed:03/11/03 <br /> Ferrous Iron 0.481 0,10 mg/I 0.400 ND 120 87-118 QM-07 <br /> _Matrix Spike Dup(3C25012-MSD1) Source:MMC0495-02 Prepared&Analyzed:03/11/03 <br /> Ferrous iron 0.484 0.10 MO 0.400 ND 121 87-118 0.622 W �10 QM-07 <br /> Sequoia 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 /> 20 of 25 <br />