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ref pi 819 Striker Avenue,Suite 8 <br /> [ Sequoia Sacrament95834 <br /> (9166)92 92 1-9600-%M <br /> FAX(916)921-0 100 <br /> Analytical www.sequoialabs.com <br /> 0. <br /> SECOR International-Rancho Cordova Project: Chevron 9-2396,Acampo,CA <br /> 3017 Kilgore Road, Suite 100 Project Nuinber: 077.43485.150 Reported: <br /> Rancho Cordova CA,95670 Projeci Manager Roger Hoffmore 05/16/01 15:47 <br /> E, <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte ,i Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ft <br /> Batch 1050061 -EPA 5030A [MeOH[ <br /> Blank(1050061-BLKI) Prepared&Analyzed: 05/04/01 <br /> Tert-butyl alcohol ND :10.0 mg/kg <br /> Methyl tert-butyl ether ND 0.100 " <br /> Di-isopropyl^ether ND 0.100 " <br /> Ethyl tert-butyl ether ND 0.1.00 " <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND . 0.100 " <br /> Ethylene dibtomide ND 0.100 <br /> Surrogate: 1,2-DCA-d4 2.53 2.50 101 60-140 <br /> k I <br /> LCS(1050061-BSI) Prepared&Analyzed.05/04/01 <br /> p'—�wi tert-butyl ether 2.51 0.100 mg/kg 2.50 100 60-140 <br /> �. gate:l;2-DCA-d4 2.59 2.50 104 60-140 <br /> H <br /> Matrix Spike(1050061-MS1) Source: S104412-15 Prepared&Analyzed:05/04/01 <br /> Methyl tert-butyl ether 2.52 0.100 mg/kg 2.50 ND 98.6 60-140 <br /> Surrogate:],2-DCA d4 2.52 2.50 101 60-140 <br /> �i • <br /> Matrix Spike Dup(1050061-MSD1) Source:S104412-15 Prepared&Analyzed:05/04/01 <br /> Methyl tert-butyl ether 2.40 0.104 ing/kg 2.50 ND 93.8 60-140. 4.88 25 <br /> Surrogate:1;2-DCA44 2,44 2.50 97.6 60-140 <br /> Batch 1050076-EPA 5030B PIT <br /> Blank(1050076-BLKI) Prepared&Analyzed:05/07/01 <br /> Tert-butyl alcohol ND 200 ug/l. <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyhether ND 2.00 " <br /> Ethyl tert-butyl ether ND 2.00 " <br /> Tert-amyl methyl ether ND 2.00 " <br /> Ethanol ND 3000 " <br /> 1,2-Dichlor6ethane ND 2.00 " <br /> •i <br /> Ethylene dibiomide ND 2.00 " <br /> Surrogate:42-DCA-d4 51.2 50.0 102 60-140 <br /> i <br /> ? loia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 10 of 13 <br />