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izSequoia 885Jarv5037 <br /> � Megan Hill,CA 95037 <br /> (408)776.9600 <br /> Analytical <br /> FAX(408)782-6308 <br /> www.Sequoialabs.com <br /> tratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLK0837 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 12/23/02 10:37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K30002-EPA 5035 <br /> Blank(2K30002-BLK1) Prepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Ethanol ND 40 ug/kg <br /> tert-Butyl alcohol ND 20 " <br /> 1vlethyI 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 0-09 <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate;1,2-Dichloroethane-d4 3.88 5.00 77.6 60-140 <br /> Blank(2K30002-BLK2) Prepared: 11/30/02 Analyzed: 12/01/02 <br /> Ethanol ND 40 uglkg <br /> utyl alcohol ND 20 0-09 <br /> ethyl tert-butyl ether ND 0.5U <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 0-09 <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-13ibromoethane(EDB) ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 4.28 5.00 85.6 60-140 <br /> Laboratory Control Sample(2K30002-13SI) Prepared&Analyzed: 11/30/02 A-01 <br /> Methyl tert-butyl ether 12.5 0.50 ug/kg 10.0 125 60-140 <br /> Surrogate, l,2-Dichloroethane-d4 4.29 5.00 85,8 60-140 <br /> Matrix Spike(2K30002-MSI) Source:MLK0861-03REIPrepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Methyltert-butylether 59.7 2.5 ug/kg 49.5 ND 121 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 4.34 5.00 86.8 60-140 <br /> Soia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stater, results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety. <br /> Page l 1 of 13 <br />