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SC 1685 Jarvis Drive7 <br /> equoia Morgan Hill,CA 950037 <br /> (408)776-9600 <br /> - , Analytical PAX(408)782-66308 <br /> www.sequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO 94932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOC8D-0001 Reported: <br /> Rancho Cordova CA,95670 Project ManagecClinton Harms 08/01/05 11:10 <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 5G27004-EPA 5030E P/T/EPA 8260B <br /> Laboratory Control Sample(5G27004-BSI) Prepared&Analyzed:07/27/05 <br /> tert-Amyl methyl ether 11.6 0,50 ugA 10.0 116 80-115 HL <br /> Benzene 10.5 0.50 10.0 105 65-115 <br /> tert-Butyl alcohol 71.4 20 50.0 143 75-150 <br /> Di-isopropyl ether 11.1 0.50 10.0 111 75-125 <br /> 1,2-Dibromoethane(EDB) 12,8 0.50 10.0 128 85.120 HL <br /> 1,2-Dichloroethane 12.0 0.50 10.0 120 85-130 <br /> Ethanol 181 100 200 90 70-135 <br /> Ethyl tert-butyl ether 11.1 0.50 10.0 111 75-130 <br /> Ethylbenzene 9.93 0.50 10.0 99 75-135 <br /> Methyl tert-butyl ether 11.3 0.50 10.0 113 65-125 <br /> Toluene 10.4 0.50 10.0 104 85-120 <br /> Xylenes(total) 31.9 0.50 30.0 106 85-125 <br /> Surrogate:1,1-Dichloroethane-d4 2.76 2.50 110 60-135 <br /> Laboratory Control Sample(5G27004-BS2) Prepared&Analyzed:07/27/05 <br /> Benzene 5.82 Q50 ug/1 6.08 96 65-115 <br /> Ethylbenzene 7.72 0.50 7.84 98 75-135 <br /> Methyl tert-butyl ether 9.96 0.50 9.60 104 65-125 <br /> Toluene 35.8 0.50 32.9 109 85-120 <br /> Xylenes(total) 39.7 0.50 38.5 103 85-125 <br /> Gasoline Range Organics(C4-C12) 440 50 440 100 70-124 <br /> Surrogate:l,2-Dichloroethaned4 3.04 2.50 122 60-135 <br /> Laboratory Control Sample Dup(5G27004-BSD1) Prepared&Analyzed:07/27/05 j <br /> Cert-Amyl methyl ether 11.8 0.50 ug/i 10.0 118 80-115 2 15 HL <br /> Benzene 10.6 0.50 10.0 106 65-115 0.9 20 <br /> tert-Butyl alcohol 58.3 20 50.0 117 75-150 20 25 <br /> Di-isopropyl ether 11.2 0.50 10,0 112 75-125 0,9 15 <br /> 42-Dibromoethane(EDB) 12.7 0.50 10.0 127 85-120 0.8 15 HL <br /> 1,2-Dichloroethane 11.8 0.50 10.0 118 85-130 2 20 <br /> Ethanol 234 100 200 117 70-135 26 35 <br /> Ethyl tert-butyl ether 11.2 0.50 10,0 112 75-130 0.9 25 <br /> Ethylbenzene 10.1 0.50 10.0 101 75-135 2 15 <br /> Methyl tert-butyl ether 11.2 0.50 10.0 112 65-125 0.9 20 <br /> Toluene 10.6 0.50 10.0 106 85-120 2 20 <br /> Xylenes(total) 32.2 0.50 30.0 107 85-125 0.9 20 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document.Unless otherwise stated results are reported on a wet weight basis. <br /> 10 77us analytical report must be reproduced in its entirety. <br /> Page 25 of 27 <br />