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Sequoia 1455McDoPletaluma,C 49 4 <br /> (707)792-1865 <br /> a— ) <br /> W Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Cote-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 8260E <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-9(P411364-05)Water Sampled 11/12/04 11 25 Received 11/15/0412 57 <br /> Tert-amyl methyl ether ND 10 uSA 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 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 117% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 113% 74-135 " <br /> Surrogate Toluene-d8 118% 84-119 " <br /> *urrogate 4-Bromofluorobenzene 129% 86-119 " LH <br /> MW-10(P411364-06)Water Sampled 11/12/04 14 55 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4110669 11/26/04 11/26/04 EPA 6260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) ND 0 50 ^ <br /> 1,2-Dtchloroethane 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 121 % 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 118% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 132% 86-119 " LH <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 in its entirety <br /> Page 9of19 <br />