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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 (9 16)921 9600 FAX(9 16)921-0 100 <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 /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3/18/99 <br /> 9912 Business Park Drive,Ste 100 Project]Number 7G600-019-04 Received 3/18/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 3123/99 <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, 9030275 Extraction,Method, EPA 50301 [MeOHI <br /> Blank 9030275-BLK1 <br /> 'Pert-butyl alcohol 3/22/99 ND mg/kg 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> Dl-isopropyl ether ND 0 I00 <br /> Ethyl cert-butyl ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> Surrogate 12-DCA-d4 250 242 600-140 968 <br /> I,CS 903U75-B51 <br /> Methyl tert-butyl ether 3/22/99 250 2 55 mg/kg 700-130 102 <br /> Surrogate 1 2-DCA-d4 11 250 258 600-140 103 <br /> 9030275-MSI S903213-01 <br /> yl tert-butyl ether 3122/99 250 ND 239 mg/kg 600-140 956 <br /> Surrogate 1 2-DCA-d4 250 240 600-140 960 <br /> Matrix Spike Dun 9030775-MSD] 5903213-01 <br /> Methyl tert-butyl ether 3/22/99 250 ND 221 mg/kg 600-140 884 250 783 <br /> Surrogate 12-DCA-d4 250 225 600-140 900 <br /> e uoia Analytical -Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 7 of 8 <br />