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• • 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a- ) Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 760,Lodi,CA P304288 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36622 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 04/25/03 17:11 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 31)23008-EPA 5030B P/T <br /> Blank(31323008-BLKl) Prepared&Analyzed:04/23/03 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 4.85 5.00 97.0 78-129 <br /> Laboratory Control Sample(3D23008-BS1) Prepared&Analyzed:04/23/03 <br /> Methyl tent-butyl ether 9.75 0.50 ug/1 10.0 97.5 63-137 <br /> Surrogate:l,2-Dichloroethane-d4 5.03 5.00 101 78-129 <br /> Laboratory Control Sample(3D23008-BS2) Prepared&Analyzed:04/23/03 <br /> Methyl tert-butyl ether 8.25 0.50 ug/1 9.04 91.3 63-137 <br /> Surrogate:l,2-Dichloroethane-d4 4.94 " 5.00 98.8 78-129 <br /> Matrix Spike(3D23008-MSI) Source:MMD0554-03 Prepared&Analyzed:04/23/03 <br /> Methyl tert-butyl ether 158 2.5 ug/1 45.2 120 84.1 63-137 <br /> Surrogate:l,2-Dichloroethane-d4 4.96 " 5.00 99.2 78-129 <br /> Matrix Spike Dup(3D23008-MSD1) Source:MMD0554-03 Prepared&Analyzed:04/23/03 <br /> Methyl tert-butyl ether 158 2.5 ug/l 45.2 120 84.1 63-137 0.00 13 <br /> Surrogate:l,2-Dichloroethane-d4 5.07 5.00 101 78-129 <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 7 of 8 <br />