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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> • <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P308382 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 09/03/03 15:55 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-2(P308382-01)Water Sampled:08/14/03 13:15 Received:08/15/03 14:45 <br /> Tert-amyl methyl ether ND 1.0 UO 1 3080541 08/27/03 08/27/03 EPA 8260E <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 18 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 108% 84-122 " <br /> arrogate:1,2-Dichloroethane-d4 108% 74-135 <br /> rrogate:Toluene-d8 106% 84-119 <br /> Surrogate:4-Bromol7uorobenzene 104% 86-119 " <br /> MW-3(P308382-02)Water Sampled:08/14/03 12:55 Received:08/15/03 14:45 <br /> Tert-amyl methyl ether ND 1.0 U&I 1 3080541 08/27/03 08/27/03 EPA 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 " n <br /> Ethanol ND 100 ^ <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate;Dibromofluoromethane 108% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 110% 74-135 " <br /> Surrogate:Toluene-d8 107% 84-119 " <br /> Surrogate:4-Bromoluorobenzene 100% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 4 of 9 <br /> I <br />