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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> IW Analytical FAX(707)792-0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 I4 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Ihlution Batch Prepared Analyzed Method Note <br /> MW-7(P502227-03)Water Sampled 02/11/05 15 20 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 1 0 ugll 1 5020309 02/24/05 02/24/05 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <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 1 0 " <br /> Methyl tent-butyl ether ND 0 50 " <br /> Toluene ND 0 50 ^ " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 106% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 74-133 " <br /> Surrogate Toluene-d8 109% 84-119 <br /> Surrogate 4-Bromofluorobenzene 120% 86-119 LH <br /> MW-8(P502227-04)Water Sampled 02/11/05 15 00 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 10 ugll 1 5020309 02/24/05 02/24/05 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) ND 0 50 <br /> 1,2-Dtchloroethane 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 118% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 121% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 118% 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 8 of 18 <br />