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• • Enseco DUPLICATE CONTROL SAMPLE REPORT Amended Metals Analysis and Preparation (cont. ) Concentration Accuracy(%) Precision Analyte Spiked Measured AVG Limits (RPD) DCS1 DCS2 AVG DCS Limit Category: ICP-A Matrix: AQUEOUS QC Lot: 03 MAR 89-B Concentration Units: mg/L Aluminum 2.00 1 .82 1 .82 1 .82 91 85-115 0.0 10 Antimony 0.50 0.488 0.469 0.478 96 85-115 4.2 10 Arsenic 2.0 1 .88 1 .96 1 .92 96 85-115 4.2 10 Barium 2.0 1 .82 1.821.820000 91 85-115 0.0 10 Beryllium 0.050 0.0489 0.0489 0.0489 98 80-115 0.0 10 Boron 1 .0 1 .02 0.990 1 .00 100 85-115 3.0 10 Cadmium 0.050 0.0460 0.0420 0.0440 88 80-117 9.1 10 Calcium 100 96.6 97.5 97.0 97 85-115 1 .0 10 Chromium 0.20 0. 185 0. 180 0.182 91 85-115 2.2 10 Cobalt 0.50 0.471 0.468 0.470 94 85-115 0.0 10 Copper 0.25 0.221 0.221 0.221 88 85-115 0.0 10 Iron 1.0 0.916 0.915 0.916 92 85-115 0.0 10 Lead 0.50 0.456 0.458 0.457 91 85-115 1.1 10 Lithium 0.20 0.212 0.203 0.208 104 85-115 3.8 10 Magnesium 50 45.6 46.0 45.8 91 85-115 1 . 1 10 Manganese 0.50 0.462 0.460 0.461 92 85-115 0.0 10 Molybdenum 0.20 0. 193 0.193 0.193 96 85-115 0.0 10 Nickel 0.50 0.465 0.445 0.455 91 83-115 4.4 10 Potassium 50 48.0 48.5 48.2 96 83-115 1 .0 10 Selenium 2.0 2.02 1 .94 1 .98 99 85-115 4.0 10 Silver 0.050 0.0451 0.0441 0.0446 89 56-116 2.2 35 Sodium 100 90.8 91 .3 91 .0 91 85-115 0.0 10 Thallium 2.0 1.86 1.88 1.87 93 84-118 1 . 1 10 Tin 0.40 0.358 0.370 0.364 91 80-115 2.2 15 Titanium 0.20 0.187 0. 187 0.187 94 85-115 0.0 10 Vanadium 0.50 0.444 0.448 0.446 89 82-115 1. 1 20 Zinc 0.50 0.458 0.457 0.458 91 80-115 1 .1 20 Category: PB-FAA-A Matrix: AQUEOUS QC Lot: 02 MAR 89-A Concentration Units: mg/L Lead 0.020 0.0197 0.0201 0.0199 99 82-115 2.0 11 Calculations are performed before rounding to avoid round-off errors in calculated results.