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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: 19 JAN 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: 31 JAN 90-A <br />Concentration Units: mg/L <br />AwhChemical Oxygen <br />Demand (High) <br />Chemical Oxygen <br />Demand (Low) <br />Category: DOC -A <br />Matrix: AQUEOUS <br />QC Lot: 23 JAN 90-B <br />Concentration Units: mg/L <br />Dissolved Organic <br />Carbon <br />Category: NH3-A <br />Matrix: AQUEOUS <br />QC Lot: 31 JAN 90-A <br />Concentration Units: mg/L <br />Ammonia as N <br />Eseco <br />CORNING C-1-1 <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />2.0 <br />NA <br />NA <br />NC <br />NC <br />84-105 <br />NC <br />7 <br />3.0 <br />2.58 <br />2.59 <br />2.58 <br />86 <br />83-116 <br />0.4 <br />19 <br />2.0 <br />2.06 <br />2.06 <br />2.06 <br />103 <br />85-115 <br />0.0 <br />15 <br />2.0 <br />NA <br />NA <br />NC <br />NC <br />85-115 <br />NC <br />10 <br />2.0 <br />2.01 <br />2.01 <br />2.01 <br />101 <br />85-115 <br />0.0 <br />12 <br />8.0 <br />7.98 <br />7.99 <br />7.98 <br />100 <br />85-115 <br />0.1 <br />12 <br />10.0 <br />NA <br />NA <br />NC <br />NC <br />85-115 <br />NC <br />13 <br />500 <br />461 <br />470 <br />465 <br />93 <br />85-115 <br />2.0 <br />10 <br />50 <br />47.6 <br />45.6 <br />46.6 <br />93 <br />85-115 <br />4.3 <br />15 <br />10 <br />9.26 <br />9.55 <br />9.40 <br />94 <br />85-111 <br />3.1 <br />18 <br />1.0 1.05 1.04 1.04 105 90-118 1.0 5 <br />NO = 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 />