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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 /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> Analytical 1551 Industrial .North,Ste.D San(urna,CACarlos,CA 94070-41 t 1 (6 0)232-4954 (707) 1865 FAX(707) 792-0342 <br /> 9600 FAX(650) 232.9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/10/99 to 2/12199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2116/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/2/99 <br /> Volatile Organic 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 % Nates* <br /> Batch: 9020258 Date Prepared: 2/22/99 Extrogtion Method; UA 5030B [MeOH] <br /> Blank 9020258--BLIK1 <br /> Tert-butyl alcohol 2/22199 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 2.72 60.0-140 109 <br /> l.0 S 9020258-13SI <br /> Methyl tent-butyl ether 2123/99 2.50 2.78 mg/kg 70.0-130 111 <br /> Surrogate: 1,2-DCA-d4 " 2.50 2.75 60.0-140 110 <br /> 9020258-MSI 5902287-11 <br /> thyl 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 Dup 9020258-MSDI 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 60.0-140 98.8 <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> andra R. Hanson,Client Services Representative Page 14 of 15 <br />