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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1965 <br /> a— )�► Analytical FAX(707)7920342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-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 Now <br /> MW-13D(P502227-09)Water Sampled 02/11/05 14 25 Received 02/14/05 10 50 <br /> Tert-amyl methyl ether ND 10 ugtl 1 5020319 02/25/05 02/25/05 EPA 9260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> De-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 0 53 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1,2-Dechloroethane-d4 128% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chat"of <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 1 I of 18 <br />