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DUPLICATE CONTROL SAMPLE REPORT <br />Metals Analysis and Preparation (cont.) <br />Analyte <br />Category: AS -FAA -AT <br />Matrix: AQUEOUS <br />QC Lot: 22 JAN 90-A <br />Concentration Units: mg/L <br />Arsenic <br />Category: HG-CVAA-A <br />Matrix: AQUEOUS <br />QC Lot: 23 JAN 90-A <br />Concentration Units: mg/L <br />Mercury <br />Concentration <br />Spiked Measured <br />DCS1 DCS2 <br />Eseco <br />CORNING C31:a <br />Accuracy Precision <br />Average(%) (RPD) <br />AVG DCS Limits DCS Limit <br />0.040 0.0374 0.0368 0.0371 93 84-115 1.6 10 <br />0.0010 0.000996 0.00107 0.00103 103 85-126 6.8 17 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />