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ell <br /> lvd,North Ste D <br /> Sequoia1455McDowPealuma,CA 949544 <br /> D— (707)792-1865 <br /> Analytical. FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Ferrous Iron by Hach method 8146/1;10 Phenanthroline Method - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spikc Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3L30020-General Preparation <br /> Blank(3L30020-BLKI) _ _ Prepared&Analyzed: 12.11_1.10.3 _ <br /> Ferrous Iron ND 100 ugA <br /> Laboratory Control Sample(3L30020-BSI) _ Prepared&Analyzed: 12/11/03 <br /> Ferrous Iron 436 100 ugA 400 109 87-118 <br /> Matrix Spike(3L30020-MSI) Source:P312283-01 Prepared&Analyzed: 12/11/03 <br /> Ferrous Iron 647 100 ugA 400 220 107 87-118 IJT-04 <br /> Matrix Spike Due{31-30020-MSDI) Source: P312283-01 Prepared&Analyzed: 12/11/03 <br /> Ferrous Iron 653 100 ugJl 400 220 108 87-118 0.923 10 HT-04 <br /> i <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the chain <br /> of eustody document. Unless otherwise stated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 23 of 40 <br />