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a— ) <br /> Sequoia <br /> 1455 McDowel{Blvd ,CA Ste D <br /> Petaluma,CA 44954 <br /> Analytical (707)792- <br /> 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-4(P331175-03)Water Sampled:11/06/03 15:50 Received:11/07/03 09:00 <br /> Tert-amyl methyl ether ND 1.0 ug/l 1 3110391 11/18/03 11/18103 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 Q.50 " <br /> 1,2-Dichloroethane ND 0.50 " " n " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 1.4 4.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 109% 84-122 " <br /> urrogate:1,2-Dichloroethane-d4 125% 74-135 <br /> Surrogate:Toluene-d8 88% 84-119 <br /> Surrogate:4-BromoJluorobenzene 106% 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 /> 0 basis. This analytical report must be reproduced in its entirety. <br /> Page 5 of 10 <br /> i <br />