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885 Jarvis Drive <br /> Sequoia Morgan Hdl CA 95037 <br /> (408)776 9600 <br /> FAX(408)782-6308 <br /> Analytical <br /> • www sequwala6s cam <br /> Secor-Rancho Cordova(ARCO) Project ARCO 92133,Rancho Cordova,CA N NG0012 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/16/04 14 37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Umit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4GO9007- EPA 5030B PIT <br /> Blank(4G09007-BLKI) Prepared&Analyzed 07/09/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 12-Dibromoethane(EDB) ND 0 50 " <br /> I 2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Ifylenes(total) ND 0 50 <br /> asoline Range Organics(C4-C12) ND 50 <br /> Surrogate 11-Dtchloroethane-d4 5 63 5 00 113 78-129 <br /> Laboratory Control Sample(4G09007-BSI) Prepared&Analyzed 07/09/04 <br /> tert-Amyl methyl ether 856 050 ug/l 10 0 86 56-140 <br /> Benzene 102 050 10 0 102 78-124 <br /> tert-Butyl alcohol 444 20 500 89 0-206 <br /> Di-isopropyl ether 850 0 50 too 85 76-130 <br /> 1 2-Dibromoethane(EDB) 9 62 050 too 96 77-132 <br /> 1 2-Dtchloroethane 8 36 050 10 0 84 77-136 <br /> Ethanol 232 100 200 116 31-186 <br /> Ethyl tert-butyl ether 894 050 10 0 89 61-141 <br /> Ethylbenzene 924 0 50 l0 0 92 84-117 <br /> Methyl tert-butyl ether 802 0 50 100 80 63-137 <br /> Toluene 970 050 ion 97 78-129 <br /> Xylenes(total) 312 050 300 104 83 125 <br /> Surrogate 11-Dtchloroethane-d4 423 5 00 85 78-129 <br /> Sequoia Analytical-Morgan Hill The results to 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 as entirety <br /> Page 4 of 6 <br />