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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4GO8001-EPA 5030B P/T <br /> Laboratory Control Sample Dup(4G08001-BSD2) Prepared&Analyzed 07/08/04 <br /> Methyl tert-butyl ether 963 050 USA 992 97 63-137 10 20 <br /> Surrogate 1,2-Dichloroeihane-d4 228 250 91 78-129 <br /> i <br /> Sequoia Analytical -Petaluma The results to 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 as entirety <br /> Page 39 of 41 <br />