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1455 McDowell Blvd,North Ste D <br /> " (1) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> � ► Analytical FAX(707)792-0342 <br /> www.sequaialabs.com <br /> i <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P503065 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:JeffBrooks 03/14/05 18:14 <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(P503065-03)Water Sampled:03/01/05 10:35 Received:03/03/05 10:00 <br /> Tert-amyl methyl ether ND 1.0 ugA 1 5030114 03/10/05 03/10/05 EPA 8260B <br /> Benzene ND 0.50 <br /> Teri-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:Dibromofluoromelhane 107% 84-122 " <br /> rrogate:1,2-Dichloroethane-d4 112% 74-135 ,. <br /> rrogate:Toluene-d8 108% 84-119 <br /> Surrogate:4-Bromofluorobenzene 110% 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 />