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Sequoia [455 McDowell Blvd No Ste <br /> a)— Petaluma,CA 949544 <br /> (707)792-1865 <br /> r Analytical FAX(707)7920342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elartb 10/06/03 16 58 <br /> Volatile organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-12(P309407-13)Water Sampled 09/18/03 11 45 Received 09/19/03 15 25 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 3100060 10/02/03 10/02/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 91 % 84-122 " <br /> Surrogate 12-Dichloroethane-d4 84% 74-135 <br /> Surrogate Toluene-d8 104% 84-119 <br /> Sequoia 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 11 of 16 <br />