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tS <br /> 1455 McDowe <br /> Sequoia Petaluma,CA 94954ll Blvd North Ste 4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P407056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 37 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lunn Units Dilution Batch Prepared Analyzed Method Dote <br /> MW-2(P407056-03)Water Sampled 07/02/04 07 25 Received 07/02/0415 15 <br /> Tert-amyl methyl ether ND 10 ug/I 1 4070285 07/16/04 07/16/04 EPA 8260B <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " » <br /> 1,2-Dichloroethane 63 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 5 1 050 " <br /> Toluene ND 0 50 ^ <br /> Xylenes(total) 1 1 0 50 <br /> Surrogate Dibromofluoromethane 116% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 " <br /> Wgate Toluene-d8 110% 84-119 <br /> ro <br /> rragale 4-Bromofluorobenzene 99% 86-119 " <br /> Sequoia Analytical -Petaluma The results in Ass report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 12 <br />