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Enseco A Coming Company DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: PB-FAA-AD Matrix: AQUEOUS QC Lot: 28 JAN 92-X Concentration Units: mg/L Lead 0.02 0.0187 0.0190 0.0188 94 75-125 1 .6 20 Category: ICP-AT Matrix: AQUEOUS QC Lot: 17 JAN 92-X Concentration Units: mg/L Aluminum 2.00 2.00 2.00 2.00 100 85-115 0.1 10 Antimony 0.50 0.491 0.491 0.491 98 85-115 0.0 10 Arsenic 0.5 0.502 0.489 0.495 99 85-115 2.6 10 Barium 2.0 2.00 1 .99 2.00 100 85-115 0.4 10 Beryllium 0.050 0.0481 0.0479 0.0480 96 80-115 0.5 10 Boron 1 .0 0.918 0.907 0.912 91 85-115 1 .2 10 Cadmium 0.050 0.0472 0.0464 0.0468 94 81-118 1 .7 10 Calcium 100 105 105 105 105 85-115 0.3 10 Chromium 0.20 0.196 0.195 0. 196 98 85-115 0.8 10 Cobalt 0.50 0.496 0.499 0.498 100 85-115 0.6 10 Copper 0.25 0.249 0.249 0.249 100 85-115 0.2 10 Iron 1 .0 0.995 0.990 0.993 99 85-115 0.6 10 Lead 0.50 0.515 0.508 0.511 102 85-115 1 .3 10 Lithium 0.20 0.204 0.202 0.203 101 85-115 1 . 1 10 Magnesium 50 53. 1 52.9 53.0 106 85-115 0.5 10 Manganese 0.50 0.491 0.490 0.490 98 85-115 0.3 10 Molybdenum 0.20 0.200 0. 198 0.199 100 85-115 0.9 10 Nickel 0.50 0.493 0.495 0.494 99 83-115 0.4 10 Potassium 50 51 .4 51 .4 51 .4 103 83-115 0. 1 10 Selenium 2.0 2.01 2.02 2.02 101 85-115 0.6 10 Silver 0.050 0.0479 0.0496 0.0488 98 56-116 3.5 35 Sodium 100 103 103 103 103 85-115 0.5 10 Thallium 2.0 2.08 2.07 2.07 104 84-118 0.5 10 Tin 4.0 3.82 3.86 3.84 96 80-115 1 .0 15 Titanium 2.0 1 .89 1 .88 1 .89 94 85-115 0.3 10 Vanadium 0.50 0.499 0.498 0.498 100 82-115 0.0 20 Zinc 0.50 0.494 0.491 0.493 99 80-115 0.7 20 Calculations are performed before rounding to avoid round-off errors in calculated results.