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885 Jarvis Dnvc <br /> Morgan Hill,CA 95037 <br /> 6) <br /> Sequoia (408)776-9600 <br /> lowAnalytical FAX(408)ty 06 <br /> www scquoialabslabs.com <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MMI0807 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 10/20/03 16 45 <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 3J11010-EPA 5030E Modified <br /> Laboratory Control Sample(3J11010-BSI) Prepared&Analyzed 10/11/03 <br /> Ethanol 193 100 ug/1 200 965 31-186 <br /> tert-Butyl alcohol 552 20 500 110 0-206 <br /> Methyl tert-butyl ether 996 050 100 996 63-137 <br /> Di isopropyl ether 100 050 100 100 76-130 <br /> Ethyl tert butyl ether 104 050 100 104 61 141 <br /> tert-Amyl methyl ether 105 050 100 105 56-140 <br /> 1,2-Dichloroethane 11 0 050 100 110 77-136 <br /> 1 2-Dibromoethane(EDB) 109 050 100 109 77-132 <br /> Benzene 104 050 100 104 78-124 <br /> Toluene 105 D50 100 105 78 129 <br /> Ethylbenzene 11 2 050 100 112 84-117 <br /> Xylenes(total) 33 9 050 300 113 83-125 <br /> arrogate 12-Dichloroethane d4 534 5 00 107 78-129 <br /> Laboratory Control Sample(3J11010-BS2) Prepared&Analyzed 10/11/03 <br /> Methyl tert butyl ether 799 050 ug/I 101 79 1 63 137 <br /> Benzene 540 050 649 833 78-124 <br /> Toluene 326 0 50 297 110 78-129 <br /> Ethylbenzene 841 050 7 20 117 84-117 <br /> Xylenes(total) 420 0 50 337 125 83-125 <br /> Gasoline Range Organics 435 50 440 989 70 113 <br /> Surrogate 12-Dichloroelhane-d4 564 500 113 78-129 <br /> Laboratory Control Sample Dup(3J11010-BSD1) Prepared 10/11/03 Analyzed 10/12/03 <br /> Ethanol 192 100 ug/l 200 960 31-186 0 519 37 <br /> tent Butyl alcohol 53 9 20 500 108 0-206 2 38 22 <br /> Methyl tert butyl ether 10 1 050 100 101 63-137 140 13 <br /> Di-isopropyl ether 995 050 100 995 76-130 0 501 9 <br /> Ethyl tert-butyl ether 10 4 0 50 100 104 61-141 000 9 <br /> tert-Amyl methyl ether 106 050 100 106 56-140 0 948 12 <br /> 1,2-Dichloroethane 109 050 100 108 77-136 1 83 13 <br /> 1,2 Dibromoethane(EDB) 105 050 100 105 77-132 374 9 <br /> Benzene 997 0 50 100 997 78-124 422 12 <br /> Toluene 9 83 0 50 100 983 78-129 6 59 10 <br /> Ethylbenzene <br /> 103 050 100 103 84-117 837 10 <br /> Xylenes(total) 31 0 050 300 103 83-125 894 11 <br /> Sequoia Analytical-Morgan Dill 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 /> 20 of 22 <br />