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1455 McDowell Blvd North Ste D <br /> 954 <br /> r - Uequoia —� _ Petaluma,C 94 <br /> — (707)792-1865 <br /> — <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oafs Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/15/04 13 28 <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 /> 6100CINF2111104(P411271-01)Air Sampled 11/11/04 07 00 Received 11/12/04 09 00 <br /> Teri-amyl methyl ether ND 10 mg/m'Air 10 4110355 11/12/04 11/13/04 EPA 8260B <br /> 0022 <br /> Benzene 38 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> Ethylbenzene ND 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 5 0 <br /> Toluene 33 5 0 " <br /> Xylenes(total) 95 5 0 " <br /> Surrogate Dibromofluoromethane 112% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 121 % 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> methyl ether ND 2 4 ppmv 10 <br /> en <br /> e 12 1 6 <br /> #am.y' <br /> bu 1 alcohol ND 66 " <br /> tY <br /> Di-isopropyl ether ND 24 " <br /> Ethylbenzene ND 12 " <br /> Ethyl tert-butyl ether ND 24 " <br /> Methyl tert-butyl ether ND 14 " <br /> Toluene 87 13 " <br /> Xylenes(total) 22 1 2 <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 121 % 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <br /> �uola 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 its entirety <br /> Page 4 of 10 <br />