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Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> a- ) (408)776-9600.Analytical <br /> FAX(408)782-6308 <br /> www.sequoialabs.con <br /> Stratus Environmental Inc. Project: ARCO#5469,Stockton,CA MMB0444 <br /> 3330 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/14/03 16:22 <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 3B27002-EPA 5035 <br /> Blank 3B27002-BLK1 Prepared&Analyzed:02/26/03 <br /> Ethanol ND 40 ug/1 <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(EDS) 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-C 10) ND 50 " <br /> Surrogate: 1,2-Dichloroethane-d4 4.80 5.00 96.0 78-129 <br /> Laboratory Control Sample(3B27002-BS1) Prepared,&Analyzed:02/26/03 <br /> Methyl tert-butyl ether 10.3 0.50 ug/l 10.0 103 63-137 <br /> Benzene 10.1 0.50 10.0 101 78-124 <br /> Toluene 9.03 0.50 10.0 90.3 78129 <br /> Surrogate: 1,2-Dichloroethane-d4 5.46 5.00 109 78-129 <br /> Laboratory Control Sample�3B27002-BS2) _Prepared&Analyzed:02/26/03 <br /> Methyl tert-butyl ether 8.83 0.50 ug/I 9.04 97,7 63-137 <br /> Benzene 5.31 0.50 5.44 97.6 78-124 <br /> Toluene 28.0 0.50 32.8 $5.4 78-129 <br /> Gasoline Range Organics(C6-C 10) 391 50 440 88.9 70413 <br /> Surrogate: 1,2-Dichloroethane-d4 5.42 5.00 108 78-129 <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 /> 19 of 28 <br />