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895 Jarvis Drive <br /> 4D Sequoia Morgan 40 7795037 <br /> (408)776-960(1 <br /> Analytical www <br /> equol 782-6308 <br /> sequvalabscom <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MN41-0761 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/06/04 10 28 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Lntuts RPD Limit Notes <br /> Batch 3L31007-EPA 5030B Modified <br /> Blank(31.31007-BLK1) Prepared&Analyzed 12/31/03 <br /> Ethanol ND 100 ug/l <br /> tert Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl Cert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2 Dichloroethane ND 050 <br /> 1,2 Dibromoethane(EDB) ND 050 " <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> ylenes(total) ND 0 50 " <br /> asoline Range Organics ND 50 <br /> Surrogate 1 2-Dichloroethane-d4 5 74 500 115 78-129 <br /> Laboratory Control Sample(3L31007-BS1) Prepared&Analyzed 12/31/03 <br /> Ethanol 181 100 ug/1 200 905 31-143 <br /> tert-Butyl alcohol 428 20 500 85 6 56-131 <br /> Methyl tent-butyl ether 923 0 50 10 0 92 3 63-137 <br /> Di-isopropyl ether 100 050 10 0 100 76-130 <br /> Ethyl tent-butyl ether 100 050 10 0 100 81-121 <br /> tert-Amyl methyl ether 100 050 10 0 100 82-140 <br /> 1,2-Dichloroethane 102 050 10 0 102 77-136 <br /> 1 2-Dibromoethane(EDB) 10 2 050 100 102 77-132 <br /> Benzene 10 2 0 50 100 102 69 124 <br /> Toluene 11 1 0 50 100 111 78-129 <br /> Ethylbenzene 108 0 50 10 0 108 84-132 <br /> Xylenes(total) 33 2 050 300 111 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 4 79 5 00 958 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 basis <br /> This analytical report must be reproduced in its entirety <br /> 6of8 <br />