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DUPLICATE CONTROL SAMPLE REPORT <br />Metals Analysis and Preparation (cont.) <br />Analyte <br />Category: AS -FAA -A <br />Matrix: AQUEOUS <br />QC Lot: 23 OCT 89-A <br />Concentration Units: mg/L <br />Arsenic <br />Category: SE -FAA -A <br />Matrix: AQUEOUS <br />QC Lot: 23 OCT 89-A <br />Concentration Units: mg/L <br />Selenium <br />Category: HG-CVAA-A <br />Matrix: AQUEOUS <br />QC Lot: 02 NOV 89-A <br />Concentration Units: mg/L <br />isMercury <br />C <br />Enseco <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />0.040 0.0437 0.0415 0.0426 107 84-115 5.2 10 <br />0.010 0.00850 0.00840 0.00845 85 80-120 1.2 20 <br />1 /1 / 1 i1 1 11 i 1 11 1 1 • 1 1 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />