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l <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 /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)92 1-0100 <br /> Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos.CA 94070-41 1 1 (650)232-9600 FAX(650)232-9612 <br /> Pinnacle-C.P. Project: ARCO,5469,Stockton CA Sampled: 2/11/99 <br /> 3939 Cambridge Road,Ste. 220 Project Number: N/A Received: 2/12/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 3/1/99 <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 % Notes* <br /> Batch: 9020206 Date Prepared: 2/17/99 Extraction Method: EPA 503QB [Menu] <br /> Blank 9020206-BI.K1 <br /> Ethanol 2/17/99 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 2.56 60.0-140 102 <br /> LSA 9020206-BSI <br /> Methyl tert-butyl ether 2/17/99 2.50 2.48 mg/kg 70.0-130 99.2 <br /> Surrogate: 1,2-DCA-d4 2.50 2.60 60.0-140 104 <br /> Matrix Spikg 9020206-MSI S902174-01 <br /> Methyl tert-butyl ether 2/17/99 2.50 0.731 2.86 mg/kg 60.0-140 85.2 <br /> Surrogate: 1,2-DCA-d4 2.50 2.33 60.0-140 93.2 <br /> Matrixpike Duo 9020206-MSD1 5902174-01 <br /> Methyl tert-butyl ether 2/17/99 2.50 0.731 3.07 mg/kg 60.0-140 93.6 25.0 9.40 <br /> Surrogate: 1,2-DCA-d4 2.50 2.35 60.0-140 94.0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text ofnotes and definitions. <br /> Ronald W. Bobel,Client Services Representative Page 14 of 15 <br />