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w 1455 McDowell Blvd,North Ste D <br /> SequoiaPetaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> t <br /> www.sequoialabs.com <br /> i <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <br /> Total Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %RSC RPD <br /> [Amlytc Result Limit Units Level Result %REC Limits APD Limit Notes <br /> Batch 4060222-EPA 3010A <br /> Blank 4060222-BLK1 Prepared&Analyzed:06/10/04 <br /> Iron ND 300 ug/1 <br /> Laboratory Control Sample 4060222-BSI Prepared&Analyzed:06/10/04 <br /> Iron 5380 300 ugll 5000 108 80-120 <br /> Matrix Spike 4060222-MSI Source:P406150-01 Pre ared&Analyzed:06/10/04 <br /> Iron 5180 300 119/l 5000 ND 104 80-120 <br /> Matrix S ike 4060222-MS2 Source:P406179-02 Prepared&Analyzed:06/10/04 <br /> Iron 37900 300 119/1 5000 46000 NR 80-120 QM05 <br /> Matrix Spike Du 4060222-MSDI Source:P406150-01 Prepared&Analyzed:06/10/04 <br /> Iron 5250 300 119/1 5000 ND 105 80-120 1 20 <br /> Matrix Spike Du (4060222-MSD2) Source:P406179-02 Prepared&Analyzed:06/10/04 <br /> on 47500 300 ugll 5000 46000 30 80-120 22 20 QC20, <br /> QM05 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> Page 20 of 37 <br /> R <br />