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DSequoia 1455McDowePcIaldaCth A 4999 4(707)792-1865 <br /> Analytical FAX(707)792_0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <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(P412423-03)Water Sampled 12/20/04 11 55 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ug/1 1 5010012 01/03/05 01!03105 EPA 82606 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 " <br /> Etbylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 2 2 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> 0.urrogate 4-Bromofluorobenzene 105% 86-119 " <br /> MW-4(P412423-04)Water Sampled 12/20/04 10 14 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ugA 1 5010012 01/03/05 01/03/05 EPA 8260B <br /> Benzene 0 66 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> I,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 18 0 50 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 104% 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 /> Thts analytical report must be reproduced in its entirety <br /> Page 7 of 33 <br />