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lvd North Ste <br /> Sequoia 1455McDowPealuma CA 94954 <br /> Analytical (707)792 1 <br /> FAX(707}792-0342342 <br /> up <br /> www sequoiaEabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P312630 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/13/04 17 22 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilut:on Batch Prepared Analyzed Method ]Votes <br /> Domestic Well(P312630-03)Water Sampled 12/23/03 04 25 Received 12/23/03 07 55 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4010016 01/05/04 01/05/04 EPA 8260B <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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 111 % 84-122 <br /> W. gate12-Dichloroethane-d4 110% 74-135 <br /> .rrogate Toluene-d8 9.5% 84-119 " <br /> Surrogate 4-Bromoguorobenzene 97% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of 9 <br />