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DUPLICATE CONTROL SAMPLE REPORT <br />Wet Chemistry Analysis and Preparation (cont.) <br />Analyte <br />Category: COD -A <br />Matrix: AQUEOUS <br />QC Lot: 31 JAN 90-D <br />Concentration Units: mg/L <br />Chemical Oxygen <br />Demand (High) <br />Chemical Oxygen <br />Demand (Low) <br />Category: CR6-A <br />Matrix: AQUEOUS <br />QC Lot: 12 JAN 90-A <br />Concentration Units: mg/L <br />Chromium (VI) <br />Enseco <br />CANING C. -= <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />500 <br />458 <br />468 <br />463 <br />93 <br />85-115 <br />2.0 <br />10 <br />50 <br />48.8 <br />47.2 <br />48.0 <br />96 <br />85-115 <br />3.3 <br />15 <br />0.1 <br />0.0970 <br />0.0930 <br />0.0950 <br />95 <br />87-117 <br />4.2 <br />10 <br />0 Calculations are performed before rounding to avoid round -off errors in calculated results <br />