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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865865 <br /> Analytical FAX cquoi 792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P411134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR16619 Reported <br /> Sacramento CA,95833 Project Manager,Tay Johnson 11/07/04 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> 6100AEFF-110404(P411134-01)Air Sampled 11/04/040803 Received 11/05/040900 <br /> Benzene 43 0 50 mg/m'Air 1 4110165 11/05/04 11/05/04 BPA 8260B <br /> 1036 <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Benzene 14 016 ppmv " <br /> Ethylbenzene ND 0 12 " <br /> Methyl tert-butyl ether ND 0 14 " <br /> Toluene ND 013 <br /> Xylenes(total) ND 0 12 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 99% 74-135 <br /> ogate Toluene-d8 95% 84-119 <br /> �uola Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 4 of 8 <br />