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• 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> AnalyticalFAX(408)782-6308 <br /> www.sequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#2133,Stockton,CA M00O299 <br /> 3017 Kilgore Rd.Suite 100 Project Number:N/P Reported: <br /> Rancho Cordova CA,95670 Project Manager:Rusty Benkosky 03/23/05 13:43 <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 5C18007- EPA 5030B PIT 1 EPA 8260E <br /> Blank(5C18007-BLK1) Prepared&Analyzed: 03/18/05 <br /> tert-Amyl methyl ether ND 0.50 ug/l <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND l00 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethyibenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 'I <br /> Gasoline Range Organics(C4-Cl2) ND 50 <br /> Surrogate. l,2-Dichloroethane-d4 4.73 5.00 95 60-135 <br /> Laboratory Control Sample(5C18007-BS1) Prepared&Analyzed: 03/18/05 <br /> tort-Amyl methyl ether 10.6 0.50 ug/l 10.0 106 80-115 <br /> Benzene 9.94 0.50 10.0 99 65-115 <br /> tert-Butyl alcohol 47.5 20 50.0 95 75-150 <br /> Di-isopropyl ether 11.1 0.50 10.0 lit 75-125 <br /> 1,2-Dibromoethane(EDB) 9.38 0.50 10.0 94 85-120 <br /> 1,2-Dichloroethane 10.1 0.50 10.0 101 85-130 <br /> Ethanol 179 100 200 90 70-135 <br /> Ethyl tert-butyl ether 10.7 0.50 10.0 107 75-130 <br /> Ethylbenzene 9.91 0.50 10.0 99 75-135 <br /> Methyl tert-butyl ether 10.3 0.50 10.0 103 65-125 <br /> Toluene 9.67 0.50 10.0 97 85-120 <br /> Xylenes(total) 31.2 0.50 30.0 104 85-125 <br /> Surrogate:1,1-Dichloroethane-d4 4.58 5.00 92 60-135 <br /> Sequoia Analytical- Morgan Hill 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 12 of 17 <br />