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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a)— (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> 0 www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469, Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 %REC Limits RPD Limit Nates <br /> Batch 3050516-General Preparation <br /> Blank(3050516-BLK1) Prepared&Analyzed:05/20/03 <br /> Total Dissolved Solids ND 10000 ug/1 <br /> Laboratory Control Sample(3050516-BSI) Prepared&Analyzed:05/20/03 <br /> Total Dissolved Solids 706000 11000 ug/1 739000 96 80-120 <br /> Duplicate(3050516-DUPI) Source:P305254-11 Prepared&Analyzed:05/20/03 <br /> Total Dissolved Solids 926000 10000 ug/l 990000 7 20 <br /> Batch 3050521 -General Preparation <br /> Blank(3050521-BLKI) Prepared&Analyzed:05/19/03 <br /> Ferrous Iron ND 100 ug/I <br /> Laboratory Control Sample(3050521-BSI) Prepared&Analyzed:05/19/03 <br /> Orrou <br /> sIron 833 100 ugtl 800 104 80-120 <br /> atrix Spike(3050521-MSI) Source:P305380-01 Prepared&Analyzed:05/19/03 <br /> Ferrous Iron 1860 100 ugtl 870 880 113 75-125 <br /> Matrix Spike Dup(3050521-MSDI) Source:P305380-01 Prepared&Analyzed:05/19/03 <br /> Ferrous Iron 1860 100 ug/l 870 880 113 75-125 0 20 <br /> Batch 3050535-General Preparation <br /> Blank(3050535-BLK1) Prepared&Analyzed:05/20/03 <br /> Phosphorus ND 50 ugll <br /> 0 <br /> Sequoia <br /> quoia 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 31 of 36 <br />