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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: PB-FAA-AT Matrix: AQUEOUS QC Lot: 05 JUN 90-A Concentration Units: mg/L Lead 0.020 0.0198 0.0207 0.0202 101 82-115 4.4 11 Category: ICP-AT Matrix: AQUEOUS QC Lot: 05 JUN 90-A Concentration Units: mg/L Aluminum 2.00 1 .83 1 .88 1 .86 93 85-115 3.0 10 Antimony 0.50 0.455 0.481 0.468 94 85-115 5.6 10 Arsenic 2.0 1 .86 1 .93 1 .89 95 85-115 4.0 10 Barium 2.0 1 .91 1 .95 1 .93 96 85-115 2.2 10 Beryllium 0.050 0.0526 0.0533 0.0529 106 80-115 1 .4 10 Boron 1 .0 0.928 0.964 0.946 95 85-115 3.8 10 Cadmium 0.050 0.0488 0.0520 0.0504 101 80-117 6.3 10 Calcium 100 100 103 102 102 85-115 2.7 10 Chromium 0.20 0.192 0.200 0. 196 98 85-115 4.4 10 Cobalt 0.50 0.463 0.477 0.470 94 85-115 2.9 10 Copper 0.25 0.256 0.255 0.256 102 85-115 0.2 10 Iron 1 .0 0.940 0.960 0.950 95 85-115 2. 1 10 Lead 0.50 0.469 0.471 0.470 94 85-115 0.5 10 Lithium 0. 20 0.201 0. 199 0.200 100 85-115 1 .0 10 Magnesium 50 48.3 49. 5 48.9 98 85-115 2.5 10 Manganese 0.50 0.594 0.467 0.531 106 85-115 24 10 Molybdenum 0.20 0. 183 0. 184 0. 183 92 85-115 0.6 10 Nickel 0.50 0.457 0.488 0.473 95 83-115 6.6 10 Potassium 50 49.6 50.2 49.9 100 83-115 1 .2 10 Selenium 2.0 1 .89 2.01 1 .95 98 85-115 6.5 10 Silver 0.050 0.0414 0.0409 0.0412 82 56-116 1 .2 35 Sodium 100 99.8 101 100 100 85-115 0.7 10 Thallium 2.0 1 .88 1 .92 1 .90 95 84-118 2.3 10 Tin 0.40 0.332 0.357 0.345 86 80-115 7.4 15 Titanium 0.20 0. 169 0.208 0. 188 94 85-115 21 10 Vanadium 0.50 0.458 0.471 0.465 93 82-115 2.7 20 Zinc 0.50 0.474 0.490 0.482 96 80-115 3.4 20 Calculations are performed before rounding to avoid round-off errors in calculated results.