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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> D— (408)776-9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs corn <br /> Secor-Rancho Cordova(ARCO) Project ARCO 92133,Rancho Cordova,CA MNC0535 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/05/04 16 18 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan M11 <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4C20001-EPA 5030B P/T <br /> Matrix Spik_e_Dup S4C20001-MSD1) Source MNC0560-03 Prepared&Analyzed 03/20/04 <br /> Methyl tert-butyl ether 2070 25 ugtl 500 1600 94 0 63-137 0 484 20 QM04 <br /> Benzene 456 25 500 ND 91 2 69-124 0 660 20 <br /> Toluene 490 25 500 ND 980 78 129 2 06 20 <br /> Ethylbenzene 494 25 500 ND 988 84-132 3 71 20 <br /> Xylenes(total) 1500 25 1500 ND 100 83-137 408 20 <br /> Surrogate 12-Dtchloroethane-d4 5 15 5 00 103 78-129 <br /> Batch 4C22001 -EPA 5030B P/T <br /> Blank(4C22001-BLKI) Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/1 _ __- <br /> Ethanol ND 100 " <br /> � <br /> rt-Butyl alcohol ND 20 " <br /> ethyl tert-butyl ether ND 0 50 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 0 50 <br /> tert-Amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate 1 2-Dichloroethane-d4 5 69 500 114 78-129 <br /> Laboratory Control Sample(4C22001-BSI) Prepared&Analyzed 03/22/04 <br /> Ethanol 206 100 ug/l 200 103 31-143 <br /> tert-Butyl alcohol 484 20 500 96 8 56-131 <br /> Methyl tort-butyl ether 102 0 50 10 0 102 63-137 <br /> Di-isopropyl ether 8 11 050 10 0 81 1 76-130 <br /> Ethyl tert-butyl ether 9 85 0 50 10 0 985 81-121 <br /> cert-Amyl methyl ether 9 41 0 50 10 0 94 1 82 140 <br /> 1,2-Dtchloroethane 108 0 50 10 0 108 77-136 <br /> 1,2-Dibromoethane(EDB) 107 0 50 10 0 107 77-132 <br /> Benzene 8 83 0 50 10 0 88 3 69-124 <br /> Toluene 9 38 0 50 100 93 8 78-129 <br /> Ethylbenzene 9 58 0 50 100 95 8 84-132 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 18 of 21 <br />