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j" Sequoia 1455 McDowell Blvd, ,CA <br /> Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P311175 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 11/21/03 16:39 <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(P311175-01)Water Sampled: 11/06/03 16:10 Received: 11/07103 09:00 <br /> Tert-amyl methyl ether ND 5.0 ug11 5 3110391 H/18/03 11/18/03 EPA 8260B <br /> Benzene ND 2.5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5.0 " <br /> 1,2-Dibromoethane(EDB) ND 2.5 " <br /> 1,2-Dichloroethane ND 2.5 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2.5 " <br /> Ethyl tert-butyl ether ND 5.0 " <br /> Methyl tert-butyl ether 36 2.5 " <br /> Toluene ND 2.5 " <br /> Xylenes(total) ND 2.5 " <br /> Surrogate:Dibromofluorornethane 108% 84-122 " " <br /> urrogate:1,2-Dichloroethane-d4 120% 74-135 <br /> � <br /> Surrogale:Toluene-d8 87% 84-119 <br /> Surrogate:4-Bromofluorobenzene 100% 86-119 " <br /> MW-3(P311175-02)Water Sampled:11/06/03 16:28 Received: 11/07/03 09:00 <br /> Tert-amyl methyl ether ND 1.0 ugfl l 3110391 11/18/03 11/18/03 EPA 8260B <br /> Benzene ND 0.50 " n " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND ' 1.0 <br /> 1,2-Aibromoethane(EAB) `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:Dibromofluoromeihane 114% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 122% 74-135 " <br /> Surrogate:Toluene-d8 88% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 108% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 4 of 10 <br /> I <br />