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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1AWFAAnalytical (707)7921865 <br /> X(707)792-0342 <br /> www sequolalabs com <br /> is <br /> URS Corp-Sacramento Project Arco Site 2186, Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 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-1 (P409434-01)Water Sampled 09/23/04 11 45 Received 09123/0413 15 <br /> Tert-amyl methyl ether ND 50 ugA 5 4100101 10/05/04 10/06/04 EPA 8260D <br /> Benzene 75 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 " <br /> 112-Dibromoethane(EDB) ND 2 5 <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 500 " <br /> Ethylbenzene 84 2 5 <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tert-butyl ether 80 2 5 <br /> Toluene 42 / 2 5 " <br /> Xylenes(total) 220 2 5 " <br /> Surrogate Dibromofluoromethane 103% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 11]% 74-135 " <br /> rrogate Toluene-d8 116% 84-119 <br /> arrogate 4-Bromofluorobenzene 109% 86-119 " <br /> MW-2(P409434-02)Water Sampled 09/23/04 03 52 Received 09/23/0413 15 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4100101 10/05/04 10/05/04 EPA 8260E <br /> Benzene ND 0 50 " <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 tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 IIS% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111% 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 7 of 21 <br />