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" Sequoia 1455 McDowell blvd,North Ste <br /> (D (707) <br /> CA 94954 <br /> (707)792-1865 <br /> qW 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 ProjectNutnher; WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 3090315-General Preparation <br /> Laboratory Control Sample(3090315-BS1) Prepared&Analyzed:09/15/03 <br /> Total Dissolved Solids 702000 10000 ugh 742000 95 80-120 <br /> Duplicate(3090315-DUP1) Source: P309174-04 Prepared&Analyzed:09/15/03 <br /> Total Dissolved Solids 308000 10000 ug/l 310000 0.6 35 <br /> Batch 3090363 -General Preparation <br /> Blank(3090363-BLKI) Prepared&Analyzed:09/09/03 <br /> Ferrous Iron ND 100 ug/1 <br /> Laboratory Control Sample(3090363-BS1) Prepared&Analyzed: 09/09/03 <br /> Ferrous Iron 882 100 ug/1 800 110 80-120 <br /> Matrix Spike(3090363-MSI) Source:P309139-01 Prepared&Analyzed: 09/09/03 <br /> mous Iron 2260 100 ug/1 870 1500 87 75-125 <br /> atria Spike Dup(3090363-MSD1) Source:P309139-01 Prepared&Analyzed: 09/09/03 <br /> Ferrous Iron 2370 100 ug/l 870 1500 100 75-125 5 20 <br /> j Batch 3090373-General Preparation <br /> i <br /> Blank(3090373-BLKI) Prepared&Analyzed:09/16/03 <br /> Total Dissolved Solids ND 10000 ug/I <br /> Laboratory Control Sample(3090373-BSI) Prepared&Analyzed:09/16/03 <br /> Total Dissolved Solids 688000 10000 ug/I 742000 93 80-120 <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 34 of 38 <br />