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1455 McDowell Blvd,North Ste D <br /> a_ _� <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-0865 <br /> IWOFAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number)M6593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <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-5(P409434-05)Water Sampled 09/23/04 04 28 Received 09/23/0413 15 <br /> Tert-amyl methyl ether ND 10 ugA 1 4100101 10/05/04 10/05/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl text-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dtbromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 109% 74-135 " <br /> Ourrogate Toluene-d8 116% 84-119 <br /> rrogate 4-Bromofluorobenzene 113% 86-119 " <br /> MW-6(P409434-06)Water Sampled 09/23/04 04 26 Received 09/23/04 13 15 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4100101 10/05/04 10/06/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 ^ " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,1-Dtchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 115% 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 /> 0 77ris analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />