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Sequoia 819 Striker Avenue,JSuife 8 <br /> Sacramento,CA 95834 <br /> 15)%0 Analytical (916)921-9600 <br /> FAX(916)921-01170 <br /> SECOR International Project: ARC0434,Lodi,CA Sampled: 6/21/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 6/22/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/9/99 <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: 9070075 pate Prepared: 7/6/99 Extraction Method: EPA 50308 IMeOH) <br /> Blank 9070075-BLKI <br /> Tert-butyl alcohol 7/7/99 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 2.81 60.0-140 112 <br /> LCS 9070075-051 <br /> Methyl tert-butyl ether 7/7199 2.50 2.61 mg/kg 70.0-130 104 <br /> Surrogate: 1,2-DCA-d4 " 2.50 2.71 60.0-140 108 <br /> Matrix Spike 9070075-MSI 5906437-11 <br /> Methyl tert-butyl ether 7/8/99 2.50 ND 2.24 mg/kg 60.0-140 89.6 <br /> Surrogate. 1,1-DCA-d4 1.50 2.46 60.0-140 98.4 <br /> Matrix Spike Dup 9070075-MSDI 5906437-I1 <br /> Methyl tert-butyl ether 7/8/99 2.50 ND 2.27 mg/kg 60.0-140 90.8 25.0 1.33 <br /> Surrogate.- 1.2-DCA44 2.50 2.50 60.0-140 100 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test ofnotes and definitions. <br /> Page 9 of 10 <br />