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R,Enseco <br />DUPLICATE CONTROL SAMPLE REPORT <br />Wet Chemistry Analysis and Preparation <br />Analyte <br />Category: CL -A <br />Matrix: AQUEOUS <br />QC Lot: 11 JUL 89-A <br />Concentration Units: mg/L <br />Chloride <br />Category: SO4-S <br />Matrix: SOIL <br />QC Lot: 11 JUL 89-A <br />Concentration Units: mg/kg <br />Sul fate <br />Category: CR6-A <br />AQUEOUS <br />QC Lot: 10 JUL :• <br />Concentration Units: mg/L <br />Chromium VI <br />Category: TOC -A <br />Matrix: AQUEOUS <br />QC Lot: 17 JUL 89-C <br />Concentration Units: mg/L <br />Total Organic Carbon <br />Category: S-A <br />Matrix: AQUEOUS <br />QC Lot: 11 JUL 89-A <br />Concentration Units: mg/L <br />Sulfide, Total <br />Concentration Accuracy Precision <br />Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />50 51.0 50.5 ; 50.8 102 91-111 1.0 3 <br />20.0 19.7 18.7 19.2 96 81-111 5.2 8 <br />0.1 0.0980 0.0970 0.0975 98 87-117 1.0 10 <br />10.0 9.82 10.1 9.96 100 85-111 2.8 18 <br />0.20 0.195 0.192 0.194 97 68-127 1.6 12 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />