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Ste <br /> Sequoia 1455 McDowellPetalluma,CA 9419 4 <br /> ID (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <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 Lama Units Dilution Batch Prepared Analysed Method Note <br /> MW-9(P502227-05)Water Sampled 02/11/05 12 25 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 1 0 ugA 1 5020309 02/24/05 02/24/05 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dibromoethane(EDB) NO 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 118% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 126% 74-135 " <br /> Surrogate Toluene-d8 112% 84-119 <br /> Surrogate 4-Bromofluorobenzene 118% 86-119 " <br /> MW-10(P502227-06)Water Sampled 02/11/05 15 10 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 10 ug/! 1 5020309 02/24/05 02/24/05 EPA 8260E <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <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 0 50 " <br /> Surrogate Dibromofluoromelhane 112% 84-121 " <br /> Surrogate 1,2-Dichloroethane-d4 121 % 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 117% 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 9 of 18 <br />