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I <br /> ..F 819 Striker Avenue,Suite 8 <br /> ID <br /> SeC�UQlii' Sacramento,CA 95834 <br /> Anal tical (916)921-9500 <br /> J FAX(916)921-Oi00 t <br /> www.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr,Ste 550 Project Number: N/A Reported: ° <br /> Cameron Park CA,95682 „ Project Manager: Jay Johnson 09/20/01 14:36 C <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B-Quality Control <br /> ' Sequoia Analytical-San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090062-EPA 5030B[P/Tl <br /> i <br /> Blank 1090062-BLKI Prepared&Analyzed:09/17/01 4 <br /> t Ethanol ND 50 mg/kg <br /> 1,2-Dibromoethane ND 0.10 f <br /> 1,2-Dichloroethane ND 0.10 <br /> Di-isopropyl ether ND 0.10 <br /> Ethyl tert-butyl ether ND 0.10 " <br /> Methyl tert-butyl ether ND 0.10 " <br /> Tert-amyl methyl ether ND 0.10 <br /> Tert-butyl alcohol ND 5.0 " <br /> t Surrogate:1,2-Dichloroethane-d4 2.38 1.50 95.2 70-121 4 <br /> Surrogate:Toluene-d8 2.55 2.50 102 81-117 1 <br /> Blank 1090062-BLK2 Prepared&Analyzed:09/18/01 <br /> I-Ethanol ND 50 mg/kg <br /> 2-Dibromoethane ND 0.10 t <br /> ,2-Dichloroethane ND 0.10 <br /> Di-isopropyl ether ND 0.10 " <br /> Ethyl tert-butyl ether ND 0.10 l ' <br /> I <br /> Methyl tert-butyl ether ND 0.10 " <br />{: Tert-amyl methyl ether ND 0.10 ! <br /> Tert-butyl alcohol ND 5.0 i <br /> Surrogate: l,2-Dichloroethane-d4 2,48 1.50 99.2 70-121 <br /> i <br /> Surrogate:Toluene-d8 1.66 2.50 106. 81-117 } <br /> LCS 1090062-BSl Prepared&Analyzed:09/17/01 l <br /> i <br /> Methyl tert-butyl ether 2.38 0.10 mg/kg 2,50 95.2 70-130 j <br /> Surrogate:l,2-Dichloroethane-d4 2.46 2.50 98.4 70-121 <br />' Surrogate: Toluene-d8 2.58 2.50 103 81-117 <br /> j <br /> r <br />� l I <br /> ` I <br /> It <br /> I <br /> F <br /> i . <br /> l d <br /> It <br /> I I <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. t <br /> I <br /> Page Page 7 of 9 <br />