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1455 McDow <br /> Sequoia Petaluma CA 94954ell Blvd,North Ste 4 <br /> (707)792-1865 <br /> AnalyticaliW FAX(707)792-0342 <br /> www sequoialabs corn <br /> • <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 18 <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 /> MW-13D(P312071-09)Water Sampled 11/26/03 13 00 Received 12/01/03 15 21 <br /> Tert-amyl methyl ether ND 10 ugA 1 3120260 12109/03 12/10/03 EPA 8260B <br /> Benzene 050 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 26 050 " <br /> Toluene 083 050 " <br /> Xylenes(total) 060 050 " <br /> Surrogate Dibromofluoromethane 103% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " " " <br /> Q <br /> rrogate Toluene-d8 99% 84-119 " <br /> rrogate 4-Bromofluorobenzene 100% 86-119 <br /> Sequoia 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 /> 0 basis This analytical report must be reproduced in its entirety <br /> Page I l of 17 <br />