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G) Sequoia 819 Striker Avenue,6ulte 8 <br /> Sacramento, CA 95834 <br /> qwrAnalytical (916)921-9600 <br /> FAX(916)921-0100 <br /> SECOR International Project: ARCO 434,Lodi,CA Sampled: 6/18/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 7/8/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported: 7/19/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes" <br /> Batch: 9070151 Date Prepared: 7/13/99 Extraction Method- EPA 5030D IMeOHI <br /> Blank 9070151-BI.K1 <br /> Tert-butyl alcohol 7/13/99 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> 1,2-Dichloroethane ND 0.100 <br /> Surrogate: 1,2-DCA-d4 2.50 1.74 60.0-140 110 <br /> LCS 9070151-BSI <br /> Methyl tert-butyl ether 7/13/99 2.50 2.66 mg/kg 70.0-130 106 <br /> Surrogate: /,2-DCA-d4 " 2.50 2.78 60.0-140 //1 <br /> Matrix Spike 9070151-MSI 5907042-13 <br /> Methyl tert-butyl ether 7/13/99 2.50 ND 2.39 mg/kg 60.0-140 95.6 <br /> Surrogate: 1,2-DCA-d4 " 2.50 1.50 60.0-140 /00 <br /> Matrix Spike Dpp 9070151-MSD1 5907042-13 <br /> Methyl tert-butyl ether 7/13/99 2.50 ND 2.33 mg/kg 60.0-140 93.2 25.0 2.54 <br /> Surrogate. 1,2-DCA-d4 2.50 2.48 60.0-140 99.1 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text ofnotes and definitions. <br /> Page 7 o F 8 <br />