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Sequoia 1455 McDowell <br /> CA94t9 <br /> 4 <br /> (707)792-1865 <br /> Analytical <br /> FAx(707)792-0342 <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 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-3(P409434-03)Water Sampled 09/23/04 03 56 Received 09/23/04 13 15 <br /> Ter[-amyl methyl ether ND 10 ugA 1 4100101 10/05/04 10/05/04 EPA 8260B <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 tert-buty]ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 ^ <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 110% 74-135 " <br /> OTolurrogate 116% 84-119 <br /> ene-d8ogale 4-Bromofluorobenzene 110% 86-119 " <br /> MW4(P409434-04)Water Sampled 09/23/04 04 18 Received 09/23/04 13 15 <br /> Tert-amyl methyl ether ND 50 ug11 50 4100101 10/05/04 10/05/04 EPA 8260B <br /> Benzene ND / 25 " <br /> Teri-butyl alcohol 1600 1000 <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dibromoethane(EDB) ND — 25 " <br /> 1,2-Drchloroethane 47— 25 " <br /> Ethanol ND 5000 " <br /> Ethylbenzene ND 25 " ^ <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether 2500— 25 <br /> Toluene ND 25 " <br /> Xylenes(total) ND - 25 " <br /> Surrogate Dibromofluoromethane 106% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 117% 84-119 " <br /> Surrogate 4-Brornofluorobenzene 114% 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 This analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />