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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> r ► (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoealabs cum <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Industrial Solvents by EPA Method 8015B modified -Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %uREC Urnits RPD Limit Notes <br /> Batch 4F30011 -EPA 3810 Headspace <br /> Matrix Spike Aup(4F30011-MSDI) Source P406495-14 Prepared&Analyzed 06/30/04 <br /> Methanol 995 100 ug/l 1000 ND 100 68-130 6 19 <br /> Surrogate 1 pentanol 2480 2500 99 62-129 <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with dee chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> • 77us analytical report must be reproduced in its entirety <br /> Page 33 of 41 <br />