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I <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> I <br /> URS Corp-Sacramento Project: Arco Site 434,Lodi,CA <br /> P404300 <br />+ 2870 Gateway Oaks Drive Suite 300 Project Number: G09JZ-0035 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth i 04/15/04 16:48 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical - Petaluma <br /> I <br /> Reporting Spike Source %REC RPD <br /> y Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> i Batch 4040314-EPA 3050B <br /> Blank(4040314-BLKI) Prepared&Analyzed:04/14/04 <br /> Lead ND 7.5 mg/kg <br /> Laboratory Control Sample(4040314-BSI) Prepared&Analyzed:04/14/04 <br /> k <br /> Lead 50.4 7.5 mg/kg 50.0 101 80-120 <br /> Matrix Spike(4040314-MSI) Source:P404300-02 Prepared&Analyzed:04/14/04 <br /> t Lead 30.3 5.0 mg/kg 33.3 5.3 75 75-125 <br /> Matrix Spike Dup(4040314-MSD1) Source:P404300-02 'Prepared&Analyzed:04/14/04 <br /> Lead 40.7 6.9 mg/kg 46.3 5.3 76 75-125 29 20 QC21 <br /> i <br /> I <br /> I <br /> k <br /> Sequoia Analytical-Petaluma The results in this report pply 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 entirely. <br /> Page 8 of 9 <br /> l <br />