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1455 McMwell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1865 <br /> Analytical <br /> 6) (707)792- <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number MIR36593 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 Balch Prepared Analyzed Method Note <br /> MW-7(P409434-07)Water Sampled 09/23/04 04 24 Received 09/23/0413 15 <br /> Tert-amyl methyl ether ND 1 0 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 1 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 111% 74-135 " <br /> W,. gateoToluene-d8115% 84-119rrogate 4-Bromofluorobenzene 109% 86-119 <br /> MW-8(P409434-08)Water Sampled 09/23/04 04 20 Received 09/23/04 13 15 <br /> Tert-amyl methyl ether ND 10 ugll 1 4100101 10/05/04 10/06/04 EPA 82606 <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 10 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 103% 84-122 " <br /> Surrogate I 2-Dichloroethane-d4 111% 74-135 " <br /> Surrogate Toluene-d8 115% 84-119 " <br /> Surrogate 4-Bromofluorobenzene II1% 86-119 " <br /> Sequoia Analytical -Petaluma 77re 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 werght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 21 <br />