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4 <br /> Sequoia <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> S—)r .Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> Total Metals by EPA 6000/7000 Series Methods -Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090323- EPA 3010A <br /> Blank(3090323-BL,KI) Prepared&Analyzed:09/16/03 <br /> Iron ND 300 ugli <br /> Laboratory Control Sample(3090323-BSI) Prepared&Analyzed:09/16/03 <br /> Iron 4970 300 ug/I 5000 99 80-120 <br /> Matrix Spike(3090323-MS1) Source: P309132-01 Prepared&Analyzed:09/16/03 <br /> Iron 5060 300 ugil 5000 140 98 80-120 <br /> Matrix Spike Dup(3090323-MSD1) Source:P309132-01 Prepared&Analyzed: 09/16/03 <br /> Iron 5020 300 ug/l 5000 140 98 80-120 0.8 20 <br /> equoia Analytical-Petaluma 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 /> Page 25 of 38 <br />