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1' aa 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> ,1)— (916)921-9600 <br /> Analytical <br /> 1 FAX(916)921-0100 <br /> Delta Environmental Consultants Project: Arco 2130,Stockton,CA Sampled: 9/28/99 <br /> 3164 Gold Camp Drive,Ste.200 Project Number: N/A Received: 9/29/99 <br /> Rancho Cordova,CA 95670 Project Manager: Ben Heningburg Reported: 9/30/99 <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: 9090315 Date Prepared: 9/29/99 Extraction Method: EPA 5030B[MeOHI <br /> Blank 9090315-BLKI <br /> Tert-butyl alcohol 9/29/99 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 /> Surrogate: 1,2-DCA-d4 2.50 2.77 60.0-140 111 <br /> Blank 9090315-BLK2 <br /> Tert-butyl alcohol 9/30/99 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 /> Surrogate: 1,2-DCA-d4 2.50 2.68 60.0-140 107 <br /> LCS 9090315-BSI <br /> Methyl'tert-butyl ether _9/29/99 2.50_ _ 2.62 mg/kg 70.0-130 105 _ <br /> Surrogate: 1,2-DCA-d4 2.50 2.92 60.0-140 117 <br /> Matrix Spike 9090315-MSI S909414-01 <br /> Methyl tert-butyl ether 9/29/99 2.50 ND 2.12 mg/kg 60.0-140 84.8 <br /> Surrogate: 1,2-DCA-d4 ff2.50 2.56 60.0-140 102 <br /> Matrix Spike Dup 9090315-MSD1 S909414-01 <br /> Methyl tert-butyl ether 9/29/99 2.50 ND 2.08 mg/kg 60.0-140 83.2 25.0 —.1.90 <br /> Surrogate: 1,2-DCA-d4 2.50 2.48 if60.0-140 99.2 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 10 of 11 <br />