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885 Jarvis Dr <br /> KD Sequoia Mcrgan Hill,CA 95037 <br /> W Analytical (408)77£-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.can <br /> S Corporation Project: ARCO#5450,Stockton,Ca MLL0109 <br /> 500 12th Street,Suite 100 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Oakland CA,94607 Project Manager: Vern Elarth 12/23/02 12:08 <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 2L13033-EPA 5035 <br /> Blank(2L13033-BLKI) Prepared&Analyzed: 12/11/02 <br /> Ethanol ND 40 ug/l <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 /> 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 /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate:1,2-Dichloroethane-d4 5.07 5.00 101 78-129 <br /> Laboratory Control Sample(2L13033-BSI) Prepared&Analyzed: 12/11/02 <br /> Methyl tent-butyl ether 10.4 0.50 ug/l 10.0 104 63-137 <br /> Benzene 10.6 0.50 I0.0 106 78-124 <br /> Toluene 9.24 0.50 10.0 92.4 78-129 <br /> Surrogate;1,1-Dichloroethane-d4 5.08 5.00 102 78-129 <br /> Laboratory Control Sample Dup(2L13033-BSD1) Prepared: 12/11/02 Analyzed: 12/12/02 <br /> Methyl tert-butyl ether 10.3 0.50 ug/1 10.0 103 63-137 0.966 13 <br /> Benzene 10.8 0.50 10.0 108 78-124 1.87 12 <br /> Toluene 9.25 0.50 10.0 92.5 78-129 0.108 10 <br /> Surrogate:1,2-Dichloroethane-d4 5.06 5.00 101 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 /> Page 5 of 6 <br />