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1455 McDow <br /> Sequoia Peell Blvd North Ste taluma,CA 949544 <br /> 4D (707)792-1965 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P411562 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:JefTBrooks 12/15/04 18:45 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW4(P411562-03)Water Sampled: 11/22/04 14:45 Received: 11/24/04 13:50 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 4120094 12/04/04 12/04/04 EPA 8260B <br /> Benzene ND 0.50 " <br /> TW-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 114% 84-122 " <br /> Surrog <br /> ate: 1,2-Dichloroethane-d4 118% 74-I35 " <br /> Toluene-& 116% 84-119 " <br /> Surrogate: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 must be reproduced in its entirety. <br /> Page 5 of 9 <br />