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1455 McDowell Blvd,North Ste D <br /> �"`' Sequoia Petaluma,CA 94954 <br /> DFAX <br /> '" (707)792-1865 <br /> 42 <br /> 4W Analytical ww&cqu7ialabs om <br /> www sequmalabs coin <br /> 10 <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Eiarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Mote <br /> VW4(P409397-12)Water Sampled 09/20/04 10 43 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4090738 09/29/04 09129!04 EPA 8260B <br /> Benzene ND 050 <br /> Tett-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dtchloroethane 29 050 <br /> Ethanol ND 100 » " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 0 50 n <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromci luoromethane 91% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 94% 74-135 " <br /> rrogate Toluene-d8 94% 84-119 <br /> rrogate 4-Bromofluorobenzene 86% 86-119 <br /> VW-5(P409397-13)Water Sampled 09/20/04 15 12 Received 09/22/04 15 10 <br /> Tert-amyl methyl ether ND 10 ugn 10 4100021 10/01/04 10/01/04 EPA 8260B <br /> Benzene ND 5 0 <br /> Tert-butyl alcohol ND 200 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dtchloroethane 140 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzenc ND 5 0 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 5 0 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate Dibromofluoromethane 101% 84-122 <br /> Surrogate I,2-Dtchloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 112% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> i <br /> I <br /> Sequoia Analytical-Petaluma <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwrse stated results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 12 of 29 <br />