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j 885 Jarvis Drive <br /> Sequoia MorganHill,08)77696 0 <br /> y (408)776-9600 <br /> Analytical www <br /> (408) x6308 <br /> sequotalabs cont <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MM10807 <br /> 3017 Kilgore Rd Suite 100 Protect Number N/P 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 3JO8002-EPA 5030B Modified <br /> Blank(3J08002-BLKI) Prepared&Analyzed 10/08/03 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/I <br /> Ethanoi ND 100 " <br /> tert-Butyl alcohol ND 20 O 12a <br /> Methyl Cert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1 2-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylb'--enc ND 0 50 " <br /> ylenes(total) ND 0 50 " <br /> Surrogate 12-Dtchloroethane-d4 5 54 .500 <br /> 111 78-129 <br /> Laboratory Control Sample(3J08002-BSI) Prepared&Analyzed 10/08/03 <br /> Ethanol 186 100 ug/l 200 93 0 31 186 <br /> tent-Butyl alcohol 31 8 20 500 63 6 0 206 0-12a <br /> Methyl tcrt-butyl ether 825 050 100 82 5 63-137 <br /> Di-isopropyl ether 894 050 100 894 76-130 <br /> Ethyl tent butyl ether 893 050 100 893 61-141 <br /> tert-Amyl methyl ether 889 050 100 88 9 56 140 <br /> 1,2-Dtchloroethane 934 050 100 93 4 77-136 <br /> 1,2-Dibromoethane(EDB) 9 83 050 100 98 3 77-132 <br /> Benzene 9 11 050 100 91 1 78-124 <br /> Toluene 938 050 100 93 8 78 129 <br /> Ethylbenzene 978 050 100 979 84 117 <br /> Xylenes(total) 288 050 300 960 83-125 <br /> Surrogate 1 2-Dichloroethane-d4 5 12 500 102 78-129 <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 bask <br /> This analytical report must be reproduced in its entirety <br /> 14 of 22 <br />