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lvd,North Ste <br /> 41) Sequoia 1455 McDow Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 30 <br /> Industrial Solvents by EPA Method 8015B modified- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPA <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4D22004-EPA 3810 Headspace <br /> Blank(4D22004-BLKI) Prepared&Analyzed 04/22/04 <br /> Methanol ND 1 0 mg/kg <br /> Surrogate I-pentanol 863 10 0 863 56-142 <br /> _Laboratory Control Sample(4D22004-BSI) Prepared&Analyzed 04/22/04 _ <br /> Methanol 9 96 — 10 mg/kg 100 99.6 - 76-164 <br /> Surrogate 1-pentanol 911 100 921 56-142 <br /> Laboratory Control Sample Dup(4D22004-BSDI) Prepared&Analyzed 04/22/04 <br /> Methanol 9 43 1 0 mg/kg 10 0 94 3 X76-164 5 47 25 <br /> Surrogate I-pentanol 904 100 904 56-142 <br /> 0 <br /> Sequoia <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytscal report must be reproduced in its entirety <br /> Page 6 of 12 <br />