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� y <br /> Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4D_ Analytical 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916 )921-9600 FAX(916)921-0100 <br /> � <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 707)792-1865 FAX(707)792-0342 <br /> Pinnacle-C.P. Project: ARCO,5469,Stockton CA Sampled: 2/17/99 <br /> 3939 Cambridge Road,Ste.220 Project Number: N/A Received: 2/17/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 2/25,3/3/99 <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 /> FAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9020258 Date Prepared: 2/22/99 Extraction Method: EPA 5030D f nut <br /> Blank 90202_ 58-BL.K1 <br /> Ethanol 2/22/99 ND mg/kg 150 <br /> Tert-butyl alcohol ND 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 2.72 60.0-140 109 <br /> LCS 9020258-BSI <br /> Methyl tert-butyl ether 2/23/99 2.50 2.78 mg/kg 70.0-130 111 <br /> Surrogate: 1,2-DCA-d4 11 2.50 2.75 60.0-140 110 <br /> Matrix Spike 9020258-MSI 5902287-11 <br /> Methyl tert-butyl ether 2/23/99 2.50 ND 2.63 mg/kg 60.0-140 105 <br /> Surrogate: 1,2-DCA-d4 2.50 2.57 60.0-140 103 <br /> Matrix Spike Dun 9020258-MSD1 S902287-11 <br /> Methyl tert-butyl ether 2/23/99 2.50 ND 2.58 mg/kg 60.0-140 103 25.0 1.92 <br /> Surrogate: 1,2-DCA-d4 2.50 2.47 60.0440 98.8 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> � ----------- <br /> 2onald W. Bobel,Client Services Repentative Page 8 of 9 <br />