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r <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a_ _� (707) <br /> 1865 <br /> Analytical 792- <br /> FAX(707)792-0342342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Projecr.Arco Site 5450,Stockton,CA P409110 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager Teff Brooks 09/16/04 15:54 <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 /> MW-4(P409110-03)Water Sampled:0813110415:05 Received:09/03/04 14:30 <br /> Tert-amyl methyl ether ND 1.0 ugfl 1 4090279 09/14/04 09/14/04 FPA 8260B <br /> Benzene ND 0.50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 3.1 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 105% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 103% 74-135 " <br /> • Surrogate:Toluene-d8 107% 84-119 <br /> Surrogate:4-Bromofluorobenzene 107% 86-119 " <br /> Sequoia Analytical-Petaluma The results in 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 5 of 9 <br />