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Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs com <br /> Stratus E:nvinmental Inc. Project: ARCO#5469,Stockton,CA <br /> 3330 CaPark Dr.,Suite 550 Project Number: Arco 45469,Stockton,CA MMC0495 <br /> CameronCA,95682 Reported: <br /> Project Manager: Jay Johnson 03/28/03 15:43 <br /> Total Metals by EPA 200 Series Methods - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %MC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C17020-EPA 3005A <br /> Blank(3C17020-BLKI) Prepared:03/17/03 Analyzed:03/18/03 <br /> Iron ND 0.10 mg/I <br /> Laboratory Control Sample(3C17020-BSI) Prepared:43/17/03 Analyzed:03/18/03 <br /> Iron 1.42 0,10 mg/I 1.00 102 91-116 <br /> Matrix Spike(3C17020-MS1) Source:MMC0495-01 Prepared:03/17/03 Analyzed:03/18/03 <br /> Iron 3.13 0.10 mg/1 1.00 2.2 <br /> i. 93.0 70-130 <br /> Matrix Spike Dup(3C17020-MSDI) Source: MMC0495-01 Prepared:03/17/03 Analyzed: 03/18/03 <br /> Iron 3.20 0.10mgll 1.00 2.2 100 70-130 2,21 20 <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 /> 17 of 25 <br />