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1455 McDowell Blvd Borth Ste D <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> • www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stocktun,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limn units Dilution Batch Prepared Analyzed Method Note <br /> VW-3B(P406360-1I)Water Sampled 06/17/04 09 55 Received 06/17/04 11 50 <br /> Tert-amyl methyl ether ND 5 0 ug/l 5 4060657 06/30/04 06/30/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 <br /> Di-isopropyl ether ND 5 0 <br /> 1,2-Dichloroethane 15- 2 5 <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl test-butyl ether 180 2 5 " <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Dibromofluoromethane 114% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 129% 74-135O <br /> rogate Toluene-d8 102% 84-119 <br /> rrogate 4-Bromofluorobenzene 112% 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 frust be reproduced to its entirety <br /> Page 12 of 21 <br />