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L <br />DUPLICATE CONTROL SAMPLE REPORT <br />Wet Chemistry Analysis and Preparation <br />w <br />Category: IC -A <br />Matrix: AQUEOUS <br />QC Lot: 05 APR 90-A <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: TOC -A <br />Matrix: AQUEOUS <br />QC Lot: 06 APR 90-A <br />Concentration Units: mg/L <br />o .. <br />Category: S-A <br />Matrix: AQUEOUS <br />QC Lot: 09 APR 90-A <br />Concentration Units: mg/L <br />Sulfide, Total <br />Enseco <br />A CORNING Como <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 />3.12 <br />3.06 <br />3.09 <br />103 <br />83-116 <br />1.9 <br />19 <br />2.0 <br />2.20 <br />2.22 <br />2.21 <br />111 <br />85-115 <br />0.9 <br />15 <br />5.0 <br />NA <br />NA <br />NC <br />NC <br />85-115 <br />NC <br />10 <br />2.0 <br />2.25 <br />2.18 <br />2.22 <br />111 <br />85-115 <br />3.2 <br />12 <br />8.0 <br />8.35 <br />8.00 <br />8.18 <br />102 <br />85-115 <br />4.3 <br />12 <br />10.0 <br />10.7 <br />10.4 <br />10.5 <br />105 <br />85-115 <br />2.8 <br />13 <br />0.20 0.199 0.191 0.195 98 68-127 4.1 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 />