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Ensecc <br />DUPLICATE CONTROL SAMPLE REPORT <br />Metals Analysis and Preparation (cont.) <br />Analyte <br />Category: AS -FAA -A <br />Matrix: AQUEOUS <br />QC Lot: 10 JUL 89-A <br />Concentration Units: mg/L <br />Arsenic <br />Category: SE -FAA -A <br />Matrix: AQUEOUS <br />QC Lot: 10 JUL 89-A <br />Concentration Units: mg/L <br />Selenium <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AUG DCS Limits DCS Limit <br />0.040 0.0356 0.0368 0.0362 91 84-115 3.3 10 <br />0.010 0.00900 0.00920 0.00910 91 80-120 2.2 20 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />v <br />