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DUPLICATE CONTROL SAMPLE REPORT <br />Wet Chemistry Analysis and Preparation <br />Analyte <br />Category: IC -A <br />Matrix: AQUEOUS <br />QC Lot: 06 APR 90-B <br />Concentration Units: mg/L <br />Fluoride <br />Chloride <br />Nitrite as N <br />Bromide <br />Nitrate as N <br />Sulfate <br />Orthophosphate as P <br />Category: COD -A <br />Matrix: AQUEOUS <br />QC Lot: 18 APR 90-A <br />Concentration Units: mg/L <br />Chemical Oxygen <br />Demand (High) <br />Chemical Oxygen <br />Demand (Low) <br />Enseco <br />_�; :NING GMn Y <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits OCS Limit <br />2.0 <br />NA <br />NA <br />NC <br />NC <br />84-105 <br />NC <br />7 <br />3.0 <br />2.84 <br />2.71 <br />2.78 <br />93 <br />83-116 <br />4.7 <br />19 <br />2.0 <br />1.95 <br />1.94 <br />1.94 <br />97 <br />85-115 <br />0.5 <br />15 <br />5.0 <br />NA <br />NA <br />NC <br />NC <br />85-115 <br />NC <br />10 <br />2.0 <br />1.90 <br />1.89 <br />1.90 <br />95 <br />85-115 <br />0.5 <br />12 <br />8.0 <br />7.72 <br />7.78 <br />7.75 <br />97 <br />85-115 <br />0.8 <br />12 <br />10.0 <br />10.1 <br />9.92 <br />10.0 <br />100 <br />85-115 <br />2.0 <br />13 <br />500 473 468 470 94 85-115 1.1 <br />50 51.1 45.5 48.3 97 85-115 12 <br />ND = Not detected. <br />NC = Not calculated, calculation not applicable. <br />NA = Not applicable. <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />