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885 Jarvis Drive <br /> a- ) Sequoia Morgan Hill,CA 95037 <br /> (408)77b 00 <br /> qW Analytical FAX(408)782-636308 <br /> www.sequoialabs.corr <br /> OURS Corporation[I I Project: ARCO 45450,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 09/25/02 15:23 <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 2I18018-EPA 5030B PIT <br /> Blank 2I18018-BLK1) Prepared&Analzed:09/18/02 <br /> Ethanol ND 40 ugR <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Cert-Amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethylene dibromide ND 0.50 " <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Total Xylenes ND 0.50 " <br /> asoline Range Organics(C6-C 10) ND 50 " <br /> urrogate: 1,2-Dichloroethane-d4 5.24 " 5.00 105 78-129 <br /> LCS 2I18018-$S1 Prepared&Analyzed:09/18/02 <br /> Methyl tert-butyl ether 10.6 0.50 11911 10.0 106 63-137 <br /> Benzene 8.54 0.50 10.0 85.4 78-124 <br /> Toluene 9.86 0.50 10.0 98.6 78-129 <br /> Surrogate: 1,2-Dichloroethane-d4 5.22 " 5.00 104 78-129 <br /> GCS 2118018-BS2) Prepared&Analyzed:09/18/02 <br /> Methyl tert-butyl ether 10.4 0.50 ugi 8.40 124 63-137 <br /> Benzene 4.92 0.50 5.28 93.2 78-124 <br /> Toluene 33.4 0.50 31.8 105 78-129 <br /> Gasoline Range Organics(C6-C 10) 402 50 440 91.4 70-113 <br /> Surrogate:1,2-Dichloroethane-d4 5.15 5.00 103 78-129 <br /> I <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> 0 of custody document. This analytical report must be reproduced in its entirety. <br /> 4 of 6 <br />