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f <br /> 1885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 45037 <br /> a- ) <br /> • FAX(408)782-9600 <br /> Analytical wwwv.uq o�labs.o0m <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOC8D-0001 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Clinton 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 5G25006- EPA 5030B PIT 1 EPA 8260B <br /> Laboratory Control Sample(SG25006-BS1) Prepared&Analyzed:07/25/05 <br /> tert-Amyl methyl ether 9.63 0.50 ug/l 10.0 96 80-115 <br /> Benzene 10.9 0.50 10.0 109 65-115 <br /> tert-Butyl alcohol 37.3 20 50.0 75 75-150 <br /> Di-isopropyl ether 9.98 0.50 10.0 100 75-125 <br /> 1,2-Dibromoethane(EDB) 9.75 0.50 10.0 98 85-120 <br /> 1,2-Dichloroethane 9.68 0.50 10.0 97 85-130 <br /> Ethanol 108 100 200 54 70-135 HM <br /> Ethyl tert-butyl ether 9.61 0.50 10.0 96 75-130 <br /> Ethylbenzene 11.4 0.50 10.0 114 75-135 <br /> Methyl tert-butyl ether 9.18 0.50 10.0 92 65-125 <br /> Toluene 10.5 0.50 10.0 105 85-120 <br /> .Xylenes(total) 34.8 0.50 30.0 116 85-125 <br /> Surrogate:1,2-Dichloroethane-d4 2.12 2.50 85 60.135 <br /> Laboratory Control Sample(5G25006-BS2) Prepared&Analyzed:07/25/05 - <br /> Benzene 7.54 0.50 ug/i 6.08 124 65-115 HL <br /> Ethylbenzene 11.0 0.50 7.84 140 75-135 HL <br /> Methyl tert-butyl ether 9.88 0.50 9.60 103 65-125 <br /> Toluene 42.5 0.50 32.9 129 85-120 f1L <br /> Xylcnes(total) 54.1 0.50 38.5 141 85-125 HL. <br /> Gasoline Range Organics(C4-C 12) 579 50 440 132 70-124 HL <br /> Surrogate:1,2-Dichloroethane-d4 2.45 2.50 98 60-135 <br /> Laboratory Control Sample Dup(5G25006-BSD1) Prepared&Analyzed:07/25/05 _ <br /> tert-Amyl methyl ether 9.41 0.50 ug/l 10.0 94 80-115 2 15 <br /> Benzene 11.2 0,50 10.0 lit 65-115 3 20 <br /> tert-Butyl alcohol 53.9 20 50.0 108 75-150 36 25 BA <br /> Di-isopropyl ether 9,92 0.50 10.0 99 75-125 0.6 15 <br /> 1,2-Dibromoethane(EDB) 9.53 0.50 10.0 95 55-120 2 15 <br /> 1,2-Dichloroethane 9.63 0.50 10.0 96 85-130 0.5 20 <br /> Ethanol 244 100 200 122 70-135 77 35 BA <br /> Ethyl ten-butyl ether 9.43 0.50 10.0 94 75-130 2 25 <br /> Ethylbenzene 11.3 0.50 10.0 113 75-135 0.9 15 <br /> Methyl tert-butyl ether 6.85 0.50 10.0 88 65-125 4 20 <br /> Toluene 10.4 0.50 10.0 104 85-120 1 20 <br /> Xylenes(total) 35.2 0.50 30.0 117 85-125 1 20 <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 15 of 27 <br />