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Sequoia 1455McDowPealumNortha,,CA 49 4 <br /> (707)792-1865 <br /> a— ) <br /> W Analytical FAX(707)792.0342 <br /> www sequotalabs corp <br /> • <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 82608 <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> AoalYte Result Limit Units Dilution 13ateh Prepared Analyzed Method Note <br /> MW-13D(P411364-09)Water Sampled 11/12/04 13 00 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4110669 11/26/04 11/26/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dtbromoethane(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 ter(-butyl ether 077 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 117% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 121 % 74-135 " <br /> Surrogate Toluene-d8 115% 84-119 " <br /> gate 4-Bromofluorobenzene 123% 86-119 LHWurro <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 to its entirety <br /> • <br /> Page 11 of 19 <br />