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85 Jarvis Dr <br /> Sequoia Morgan Hill,CA 98l,CA95037 037 <br /> Anal tical (408)776-9600 <br /> Y FAX(408)782-6308 <br /> www.sequoialabs.corr <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MMB0444 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number; ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/14/03 16:22 <br /> Ferrous Iron by Hach method 8146/1,10 Phenanthroline Method-Quality Control <br /> Sequoia Analytical-Morgan HID <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3B20017-General Preparation <br /> Blank 3B20017-BLKI Prepared&Analyzed:02/12/03 <br /> Ferrous Iron ND 0.10 mg/l <br /> Laboratory Control Sam le 3B20017-BS1 Prepared&Analyzed:02/12/03 <br /> Ferrous Iron 0.380 0.10 mg/l 0.400 95.0 87-118 <br /> Matrix Spike(3B20017-MSI) Source:MMB0444-10 Prepared&Analyzed:02/12/03 <br /> Ferrous Iron ND 0.10 mg/1 0.400 ND 87-118 QM-07 <br /> Matrix Spike Dup t3B20017-MSD/) Source:MMB04_44-10 Prepared&Analyzed:02/12/03- <br /> Ferrous Iron ND 0.10 mg/1 0.404 ND 87-118 10 QM-07 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 25 of 28 <br />