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1455 McDowell Blvd,Korth Ste D <br /> 4DSequoia Petaluma.CA 94954 <br /> (707)792-1965 <br /> mW Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450 Stockton CA <br /> rP J P402594 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number-, WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 03/12/04 16:07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-2(P402594-03)Water Sampled:0212610411:15 Received:02/27/04 07:10 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4030184 03/09/04 03/09/04 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 0.5a " <br /> Ethanol ND 104 " <br /> Ethylbenzene ND 0.50. " <br /> Ethyl tert-butyl ether ND 1.0. <br /> Methyl tert-butyl ether 19 0.5Q " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 108% 84-122 " <br /> Surrogate:1,2-Dichloroethane-d4 107% 74-135 " <br /> urrogate:Toluene-d8 101 % 84-119 n n <br /> Surrogate:4-Bromofluorobenzene 100% 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 11 <br />