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a_ _� FAX <br /> 1455 McDowell Blvd North Ste D <br /> PetalSe u Ola uma CA 94954 <br /> q (767)792-1865 <br /> 0 14W Analytical w )792-0342 <br /> w-ww sequ sequoialabs tom <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G093Z-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19!05 11 20 <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 /> 6100 AINF(P505120-01)Air Sampled 05/16/05 10 45 Received 05/16/05 12 53 <br /> Tert-amyl methyl ether ND 200 mg/m'Air 200 5050092 05/17/05 05/17/05 EPA 8260B <br /> 15 14 <br /> Benzene 160 100 <br /> Tert-butyl alcohol ND 4000 <br /> Di-isopropyl ether ND 200 <br /> Ethylbenzene ND 100 <br /> Ethyl tert-butyl ether ND 200 <br /> Methyl tert-butyl ether ND 100 <br /> Toluene 140 100 <br /> Xylenes(total) 130 100 " <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 90% 84-119 <br /> *rt amyl methyl ether ND 48 ppmv 200 <br /> enzene 52 32 <br /> Tert-butyl alcohol ND 1300 " <br /> Di-isopropyl ether ND 48 " <br /> Ethylbenzene ND 24 " <br /> Ethyl tert-butyl ether ND 48 <br /> Methyl tert-butyl ether ND 28 " <br /> Toluene 38 26 " <br /> Xylenes(total) 31 24 " <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dichloroelhane-d4 114% 74-135 <br /> Surrogate Toluene-d8 90% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 l l <br />