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` 1455 McDowell Blvd,North Ste D <br /> Sequoia owPetaluma,CA 94954 <br /> a_ _�► (707)792-1865 <br /> Analytical <br /> FAX(707)792A342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 14 <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-5(P502227-01)Water Sampled 02/11/0515 30 Recemcd 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5020319 02/25/05 02/25/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Do-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 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dihromofluoromethane 115% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 127% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 <br /> Surrogate 4-Bromojluorohenzene 114% 86-119 <br /> MW-6(PS02227-02)Water Sampled 02111/051450 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 10 ug/I 1 5020319 02/25/05 02/25/05 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 9 9 050 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 113% 84-122 " <br /> Surrogate 1,2-Dachloroethane-d4 126% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 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 /> • This analytical report must be reproduced in its entirety <br /> Page 7 of 18 <br />