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8lJarvis Dr <br /> a <br /> Sequoia Mpn Hill,CA 95037 <br /> Analytical (408)782.9600 <br /> FAX(408)782-6308 <br /> www.se gnoialabs.ca'n <br /> * atus Environmental Inc, Project. ARCO#5469,Stockton,CA MLL0441 <br /> 30 Cameron Park Dr.,Suite 550 Project Number. ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 12:15 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Mill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L20026-EPA 5030B P/T <br /> Blank(2L20026-BLK1) Prepared: 12/19/02 Analyzed: 12/20/02 <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 /> Surrogate:1,2-Dichloroethane-d4 5.65 5.00 113 78-129 <br /> Laboratory Control Sample(ZL20026-BS1) - Prepared: 12/19/02 Analyzed: 12/20/02 <br /> thyl tert-butyl ether 9.71 0.50 ug/I 10.0 97.1 63-137 <br /> Surrogate:1,2-Dichloroethane-d4 5.27 - 5.00 105 78-129 <br /> Laboratory Control Sample Dup(ZL20026-BSDI) Prepared: 12/19/02 Analyzed: 12/20/02 <br /> Methyl Cert-butyl ether — 9.39 0.50 ugll 10.0 - 93.9 63-137 3.35 13 <br /> Surrogate: l,2-Dichloroethane-d4 5.40 5.00 108 78-129 <br /> Batch 2L24008-EPA 5030B P/T <br /> Blank(2L24008-13LK1) Prepared&Analyzed: 12/24/02 <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 tent-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 /> Surrogate: l,2-Dichloroethane-d4 5.91 5,00 118 78-129 <br /> �uoia 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 18 of 20 <br />