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(D (707) <br /> 1Sequoia Petaluma,CA949S4455 McDowell Blvd North Ste Analytical FAX 792.1865 <br /> (7017)792-0342 <br /> . www.sequoialahs.com <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P405282 <br /> 2870 Gateway Oaks Drive Suite 300 ProjectNumber:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager.Vernon P.Elarth 06/02/04 14:08 <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 /> MW4(P405282-03)Water Sampled:05/11/04 13:20 Received:05112/0407:20 <br /> Tert-amyl methyl ether ND 1.0 um 1 4050590 05/24/04 05/25/04 EPA 8260B <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 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl cert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 0.54 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromethane 97% 84-122O <br /> " <br /> rrogate: 1,2-Dichloroethane-d4 103% 74-135 <br /> rrogate: Toluene-d8 88% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 96% 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 entirely. <br /> Page 5 of 9 <br />