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Enseco DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: ICP-AT Matrix: AQUEOUS QC Lot: 27 FEB 90-D Concentration Units: mg/L Aluminum 2.00 1.96 1.97 1 .96 98 85-115 0. 1 10 Antimony 0.50 0.502 0.496 0.499 100 85-115 1 .3 10 Arsenic 2.0 1.96 2.02 1.99 99 85-115 2.8 10 Barium 2.0 1.96 1 .96 1 .96 98 85-115 0.3 10 Beryllium 0.050 0.0450 0.0450 0.0450 90 80-115 0.0 10 Boron 1 .0 0.977 0.978 0.977 98 85-115 0. 1 10 Cadmium 0.050 0.0570 0.0561 0.0566 113 80-117 1 .7 10 Calcium 100 102 102 102 102 85-115 0. 1 10 Chromium 0.20 0.201 0.201 0.201 100 85-115 0. 1 10 Cobalt 0.50 0.491 0.488 0.489 98 85-115 0.8 10 Copper 0.25 0.241 0.241 0.241 97 85-115 0.0 10 Iron 1 .0 1 .00 1 .00 1 .00 100 85-115 0. 1 10 Lead 0.50 0.488 0.490 0.489 98 85-115 0.6 10 Lithium 0.20 0. 194 0. 190 0. 192 96 85-115 1 .9 10 Magnesium 50 48.9 48.9 48.9 98 85-115 0.0 10 Manganese 0.50 0.490 0.491 0.490 98 85-115 0.2 10 Molybdenum 0.20 0. 191 0. 198 0.195 97 85-115 3.5 10 Nickel 0.50 0.490 0.490 0.490 98 83-115 0. 1 10 Potassium 50 47.2 47.2 47.2 94 83-115 0.0 10 Selenium 2.0 1 .92 2.03 1.98 99 85-115 5.8 10 Silver 0.050 0.0505 0.0509 0.0507 101 56-116 0.9 35 Sodium 100 97.9 97.9 97.9 98 85-115 0.1 10 Thallium 2.0 1 .97 1 .98 1 .97 99 84-118 0.5 10 Tin 0.40 0.389 0.387 0.388 97 80-115 0.4 15 Titanium 0.20 0. 199 0.200 0. 199 100 85-115 0.5 10 Vanadium 0.50 0.487 0.486 0.487 97 82-115 0.2 20 Zinc 0.50 0.513 0.512 0.513 103 80-115 0. 1 20 Category: PB-FAA-AT Matrix: AQUEOUS QC Lot: 27 FEB 90-C Concentration Units: mg/L Lead 0.020 0.0194 0.0191 0.0192 96 82-115 1 .6 11 Calculations are performed before rounding to avoid round-off errors in calculated results.