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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9z5)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)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 t 1 (650)232-9600 FAX(650)232-9612 <br /> Is <br /> SECOR International Project ARCO 2133,Stockton, CA Sampled 3118199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-019-04 Received 3118199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 411199 <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 % Notcs* <br /> Matrix Spike Dup(Wntinuerll - S903255-05 <br /> Surrogate / 2-DCA-d4 3/29/99 250 246 mg/kg 600-140 984 <br /> oia Analytical - Sacramento *Refer to end of report for test of notes and definitions <br /> Sandra R anson,Client Services Representative Page 10 of I i <br />