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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> a— ) (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.scquoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: NIA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 07/16/01 15:54 <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 <br /> Batch 1070026-EPA 5030B[P/Tj <br /> Blank 1070026-BLKI) Prepared&Analyzed: 07/05/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tert-butyl ether ND 2A " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl Cert-butyl ether ND 2.0 " <br /> Tert-amyl methyl ether ND 2.0 " <br /> Ethanol ND 3000 " <br /> 1,2-Dichloreethane ND 2.0 " <br /> Ethylene dibromide ND 2,0 <br /> i <br /> Surrogate: 1,2-DCA-d4 48.9 50.0 97.8 60-140 <br /> i <br /> LCS(1070026-BS I) Prepared&Analyzed:07/05/01 <br /> Methyl tert-butyl ether 49.7 2.0 ug/l 50.0 99.4 60-140 <br /> Oluatorix <br /> rrgate:l,2-DCA-d4 50.4 50.0 101 60-140 <br /> Spike(1070026-MSI) -_ Source: S106475-01 _Prepared&Analyzed: 07/OS/Ol <br /> Methyl tert-butyl ether 49.6 2.0 ugA 50.0 2.3 94.6 60-140 <br /> Surrogate: 1,2-DCA-d4 49.1 50.0 98.2 60-140 <br /> Matrix Spike Dup(10.7_0026-MSD1) Source: S106475-01 Prepared&Analyzed:07/05/01 <br /> Methyl tert-butyl ether 51.5 2.0 ugA 50.0 2.3 98.4 60-140 3.76 25 <br /> Surrogate:1,2-DCA-d4 50.4 50.0 101 60-140 <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 he reproduced in its entirety. <br /> Page Page 6 of 7 <br />