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819 Striker Avenue,Suite 8 <br /> Segl101a Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.cain <br /> t <br /> { Delta Environmental Consultants(Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number. NIA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 09/20/0I 11:31 <br /> 4 <br /> Volatile Oxygenate Compounds by EPA Method 8260A-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes s <br /> Batch 1090104-EPA 5030E(MeOH] <br /> Blank(1090104-BLKI) _ Prepared:09/11/01 Analyzed:09/12/01 _ <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0.10 " <br /> Di-isopropyl ether ND 0.10 <br /> Ethyl tert-butyl ether ND 0.10 " <br /> Tert-amyl methyl ether ND 0.10 " <br /> Ethanol ND 150 " <br />{ 1,2-Dichloroethane ND 0.10 " <br /> t <br /> Ethylene dibromide ND 0.10 " <br /> Surrogate:1.2-DCA-d4 2.33 2.50 93.2 60-140 <br /> J ' <br /> LCS(1090104-13Sl) Prepared:09/11/01 Analyzed:09/12/01 j <br /> t Methyl tert-butyl ether 2.25 0.10 mg/kg 2.50 90.0 60-140 I <br /> 4 <br /> Surrogate:1,2-DCA-d4 2.36 2.50 94.4 60-140 <br />{ F <br /> t C/ <br /> Matrix Spike(1090104-MSI) Source:5109089-01 Prepared:09/11/01 Analyzed:09/12/01 i <br /> j Methyl tert-butyl ether 2.16 0.10 mg/kg 2.50 ND 86.4 60-140 _ <br /> Surrogate:1,2-DCA-d4 2.21 2.50 88.4 60-140 <br /> Matrix Spike Dup(1090104-MSD1) Source:5109089-01 Prepared:09/11/01 Analyzed:09/12/01 i <br />' Methyl tert-butyl ether 2.11 0.10 mg/kg 2.50 ND 84.4 60-140 2.34 25 <br /> Surrogate:1,2-DCA-d4 2.13 2.50 85.2 60-140 <br /> i <br /> 1 { <br /> r - 1 <br /> i <br /> i <br />. 1 <br /> i <br /> I <br /> T <br /> y <br /> t <br /> I <br /> 1 <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. <br /> i Page Page 20 of 24 <br />