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l Blvd,North Ste D <br /> Sequoia 1455 McDowPetaaluma,CA 94954 <br /> t (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: <br /> 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 /> Conventional Chemistry Parameters by APRA/EPA 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 4060229-General Preparation <br /> Blank(4060229-BLKI) Prepared&Analyzed:06/09/04 <br /> Ferrous Iron ND 100 ug/I <br /> Laboratory Control Sample(4060229-BS1) Prepared&Analyzed:06/09/04 <br /> Ferrous Iron 732 100 u8A 800 92 80-120 <br /> i <br /> Matrix Spike(4060229-MSI) Source:P406178-07 Prepared&Anal A.06/09/04 <br /> Ferrous Iron 581 100 ug/1 800 ND 73 75-125 QM02 <br /> Matrix Spike Dup(4060229-MSDI) Source:P406178-07 Prepared&Analyzed:06/09/04 _ <br /> Ferrous Iron 581 100 ug/1 800 ND 73 75-125 0 20 QM02 <br /> Batch 4060261-General Preparation <br /> Blank(4060261-BLKI) Prepared&Analyzed:06/10/04 <br /> otal Dissolved Solids ND 10000 ug/1 <br /> laboratory Control Sample(4060261-BSI) Prepared&Analyzed: 06/10/04 <br /> Total Dissolved Solids 706000 10000 ugll 742000 95 80-120 <br /> Duplicate(4060261-DUPI) Source:P406178-01 Prepared&Analyzed: 06/10/04 <br /> Total Dissolved Solids 876000 10000 ug/1 880000 0.5 35 <br /> Batch 4060299-General Preparation <br /> Blank 4060299-BLK1Prepared&Analyzed:06/12/04 <br /> Chemical Oxygen Demand ND 20000 ug/1 <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 staled,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety. <br /> i <br /> Page 31 of 37 <br /> l <br />