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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequolalabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Numberintnin-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Aiialyte Result limit Units Dilution Batch Prepared Analysed Method Nole <br /> MW-7(P411364-03)Water Sampled 11/12/04 15 15 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 4110669 11/26/04 11/26/04 EPA 9260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <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 10 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 112% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 110% 74-135 " <br /> SW'rrogate <br /> rogate Toluene-d8 115% 84-119 " <br /> 4-Bromofluorobenzene 123% 86-119 LH <br /> MW-8(P411364-04)Water Sampled 11112/041435 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ug/I 1 4110669 11/26/04 11/26/04 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <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 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 117% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 113% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 134% 86-119 LH <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 he reproduced to its entirety <br /> Page 8 of 19 <br />