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l <br /> } t <br /> l <br /> rY 14»McDowell Blvd 5[e <br /> Sequoia Petaluma CA CA 949544 <br /> "1 (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequcialabs coo <br /> r <br /> URS Corp- Sacramento Prosect Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-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 Noie <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/ml Air 200 5050092 05/17/05 05/17/05 EPA 8260B <br /> 15 14 <br /> Benzene 160 100 " <br /> Ter-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 i <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 /> Tert-amyl methyl ether ND 48 ppmv 200 <br /> Benzene 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 ter-butyl ether T - ND- -_ - - 28- <br /> Toluene <br /> 8 Toluene 38 26 " <br /> Xylenes (total) <br /> Surrogate Dibromofluoramethane 112% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 90% 8-1-119 " <br /> Sequoia Analytical -Petaluma The results to this report apply to the samples analyzed in accordance with the chain of• <br /> custody document Unless otherivise stated results are reported on a wet werght basis <br /> This analytical report must be reproduced to its entirety <br /> Page 4 of II <br />