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8B5]arvis Drive <br /> Sequoia Morgan Hill,CA 95037037 <br /> (408)776 4600 <br /> a— —NiW Analytical FAX 782 6308 <br /> WWW sequDiequoiala65 corn <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result lAmlt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4G21002 -EPA 5030B P/T <br /> Blank(4G21002-BLKI) Prepared&Analyzed 07/21/04 <br /> tent-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane 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 /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 476 500 95 78-129 <br /> Laboratory Control Sample(4G21002-BSI) Prepared&Analyzed 07/21/04 <br /> Cert-Amyl methyl ether 101 050 ug/l 100 101 82-140 <br /> Benzene 10 8 050 100 108 69-124 <br /> tert-Butyl alcohol 516 20 500 103 56-131 <br /> Di-isopropyl ether 109 050 10 0 109 76-130 <br /> 1,2-Dibromoethane(EDB) 108 050 100 108 77-132 <br /> 1,2-Dichloroethane 10 9 050 10 0 109 77-136 <br /> Ethanol 198 100 200 99 31-143 <br /> Ethyl tert-butyl ether 108 050 10 0 108 81-121 <br /> Ethylbenzene 103 050 10 0 103 84-132 <br /> Methyl tert-butyl ether 10 6 050 10 0 106 63-137 <br /> Toluene 10 6 050 10 0 106 78-129 <br /> Xylenes(total) 294 050 300 98 83-137 <br /> Surrogate 12-Drchloroethane-d4 487 5 00 97 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 0 <br /> Page 15 of 24 <br />