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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-]865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Noie <br /> MW-9(P412205-09)Water Sampled 12/09/04 03 34 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4120463 12/22/04 12/22/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-tsopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane 2 7 050 <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 102% 84-122 " <br /> rrogate 1 2-Dichloroethane-d4 108% 74-135 <br /> rrogate Toluene-d8 102% 84-119 <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 <br /> MW-10(P412205-10)Water Sampled 12/09/04 04 23 Received 12/09/04 09 20 <br /> Ter-amyl methyl ether ND 5 0 ug/l 5 4120463 12/22/04 12/22/04 EPA 8260E <br /> Benzene ND 2 5 <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dibromoethane(EDB) ND 2 5 <br /> 1,2•Dichloroethane ND 2 5 " <br /> Ethanol ND 500 <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether 89 2 5 <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 <br /> Surrogate Dibromofluoromethane 100% 84-122 <br /> Surrogate 12-Dichloroethane-d4 109% 74-135 <br /> Surrogate Toluene-& 101% 84-119 <br /> Surrogate 4-Bromofluorobenzene 104% 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 10 of 21 <br />