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4 <br /> a— ) (707)1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P404664 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/17/04 14 05 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lieut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P404664-03)Water Sampled 04/26/04 14 40 Received 04/27/0414 35 R-05 <br /> Tert-amyl methyl ether ND 50 ug/l 5 4050190 05/10/04 05/10/04 EPA 8260B <br /> Benzene ND 25 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> 1,2-Dichloroethane 42 25 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tert-butyl ether ND 25 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate Dibroinofluoromethane 101 % 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 111 % 74-135 " <br /> A&rrogate Toluene-d8 105% 84-119 <br /> rrogate 4-Bromofluorobenzene 102% 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 5 of 9 <br />