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1680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 1 Sequoia 404 H 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)921-0100 <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 /> nnacle-C P Project ARCO 6020,Manteca,CA Sampled 5/20/99 <br /> 3939 Cambridge Road,Ste 220 Project Number N/A Received 5120/99 <br /> meron Park,CA 95682 Project Manager Joel Coffman Reported 612/99 <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'r <br /> Bitch. 20503U Date Prepared, 5126199 Extraction Method, EPA 5030B[MeOH] <br /> Sank 2059322-BLKI <br /> Tert-butyl alcohol 5/26199 ND mg/kg 100 <br /> ethyl tert-butyl ether ND 0 100 <br /> -isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0 100 <br /> rt-amyl methyl ether ND 0 100 <br /> hanol PID 150 <br /> rrogate 1 2-DCA-d4 250 245 600-140 980 <br /> 9050322-BLK2 <br /> rt-butyl alcohol 5127/99 ND mg/kg 100 <br /> ethyl ten-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> tert-butyl ether ND 0 100 <br /> amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> rrogate 1 2-DCA-d4 250 246 60 0-140 984 <br /> 9050322-LU <br /> Methyl tert-butyl ether 5/26/99 250 270 mg/kg 700-130 108 <br /> VW1 2-DCA-d4 250 242 600-140 968 <br /> Matrix Spike 9050322-MS1 S905358-01 <br /> ethyl tert-butyl ether 5/26/99 250 ND 248 mg/kg 600-140 992 <br /> rrogate 1,2-DCA-d4 2 50 246 10 600-140 984 <br /> Matrix Spike Duo 9050322-MSD1 S905358-01 <br /> Methyl tert-butyl ether 5126199 250 ND 253 mg/kg 600-140 101 250 1 80 <br /> arrogate 12-DCA-d4 250 254 fe 600-140 102 <br /> quota Analytical-Sacramento 'Refer to end of report for text of nates and deftnstions <br /> Wald W Bobel,Client Services Repreientattve Page 7 of 8 <br />