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1455 McDowell Blvd North Ste D <br /> Sequoia PetalumaCA 94954 <br /> (70707)792 1865 <br /> FAX(707)792 0342 <br /> Analytical www sequoialabs corn <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/11/04 15 36 <br /> Volatile Organic Compounds by EPA Method 82605 <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> 6100EFF210604(P410118-01)Air Sampled 10/06/04 08 35 Received 10/07/04 09 00 <br /> Tert-amyl methyl ether ND 10 mg/rn'Air 1 4100135 10/07/04 10/07/04 EPA 8260B <br /> 11 43 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND I 0 <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 104% 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <br /> Wne <br /> yl methyl ether ND 024 ppmv <br /> ND 016 " <br /> Tert-butyl alcohol ND 6 6 <br /> Di-isopropyl ether ND 0 24 <br /> Ethylbenzene ND 012 " <br /> Ethyl tert-butyl ether ND 0 24 <br /> Methyl Cert-butyl etber ND 0 W <br /> Toluene ND 013 <br /> Xylenes(total) ND 0 12 " <br /> Surrogate Dibroniofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 111 % 84-119 " <br /> oia Analytical-Petaluma The results in this report apply to the samples analyzed rn accordance ivith the chain of <br /> custody document Unless otherivise stated results are reported on a wet iveight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 4 of 9 <br />