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%Enseco A Coming Company DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Analyte Concentration Accuracy Precision Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: ICP-AT Matrix: AQUEOUS QC Lot: 28 NOV 90-B Concentration Units: mg/L Aluminum 2.00 1 .79 1 .81 80 90 85-115 0.8 10 0. 90 85-115 0.3 10 Barium Antimony 0.50 0.447 0.449 1 ..80 Arsenic 2.0 1 .79 1 .80 1 .79 90 85-115 0.5 10 2.0 1 .88 1.89 1 .89 94 85-115 0.3 10 Beryllium 0.050 0.0501 0.0507 0.0504 101 80-115 1 .2 10 Boron 1 .0 0.902 0.910 0.906 91 85-115 0.8 10 Cadmium 0.050 0.0504 0.0504 0.0504 101 80-117 0.0 10 Calcium Chromium 100 98. 1 98.2 98. 1 98 85-115 0. 1 10 Cobalt 0.20 0. 184 0. 184 0.184 92 85-115 0. 1 10 0.50 0.450 0.451 0.450 90 85-115 0.3 10 Copper 0.25 0.240 0.240 0.240 96 85-115 0. 1 10 Iron 1 .0 0.928 0.929 0.929 93 85-115 0. 1 10 Lead Lithium 0.50 0.430 0.430 0.430 86 85-115 0.0 10 0.20 0.201 0.203 0.202 101 85-115 1 .2 10 Magnesium 50 46.0 46.2 46.1 92 85-115 0.5 10 Manganese Mol0.50 0.444 0.445 0.445 89 85-115 0.2 10 ybdenum Nickel 0.20 0. 174 0.177 .0.176 88 85-115 1 .5 10 Potassium 0.50 0.453 0.461 0.457 91 83-115 1 .8 10 Selenium 50 48.6 48.5 48.6 97 83-115 0.2 10 Silver 2.0 1 .87 1 .88 1 .88 94 85-115 0.3 10 Sodium 0.050 0.0442 0.0442 0.0442 88 56-116 0.0 3'5 Thallium 100 97.7 98.2 98.0 98 85-115 0.4 10 Tin 2.0 1 .83 1 .83 1 .83 91 84-118 0. 1 10 Titanium 0.40 0.354 0.349 0.351 88 80-115 1 .5 15 Vanadium 0.20 0. 142 0. 142 0.142 71# 85-115 0.2 10 Zinc 0.50 0.457 0.457 0.457 91 82-115 0. 1 20 0.50 0.446 0.445 0.446 89 80-115 0.2 20 # = Recovery outside QC Limits Calculations are performed before rounding to avoid round-off errors in calculated results. I