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's-Enseco �-`�,DUPLICATE CONTROL SAMPLE REPORT 21 Metals Analysis and Preparation w Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) y DCS1 OCS2 AVG DCS Limits DCS Limit Category: PB-FAA-S Matrix: SOIL QC Lot: 25 OCT 91-A Concentration Units: mg/kg 0 Lead 2.0 2.13 2.16 2.14 107 80-120 1.4 20 Category: ICP-S Matrix: SOIL QC Lot: 25 OCT 91-A r; Concentration Units: mg/kg Aluminum 200 198 190 194 97 84-115 3.9 11 Antimony 50 44.5 45.6 45.0 94 81-115 2.6 10 Arsenic 50 48.4 47.3 47.9 96 82-115 2.4 10 Barium 200 195 189 192 96 85-115 3.4 10 5.0 4.81 4.69 4.75 95 70-110 2.5 10 Beryllium 100 45.2 90.9 93.0 93 85-115 4.5 10 Boron 5.0 4.49 4.50 4.49 94 81-118 0.2 15 Cadmium 10000 9750 9630 9690 97 85-115 1.3 10 Calcium 20 19.0 i8.9 18.9 95 84-115 0.9 17 Chromium 50 49.4 48.2 48.8 98 80-115 2.5 10 Cobalt 25 24.6 23.9 24.2 97 81-115 2.6 . 10 Copper 100 101 95.6 98.0 98 85-115 5.1 14 Iron 50 47.4 48.4 47.9 96 80-115 2.0 11 Lead 20.0 20.5 19.8 20.1 101 85-115 3.3 10 Lithium 5000 5130 5020 5080 102 85-115 2.2 10 ; Magnesium 50.0 50.1 47.3 48.7 97 80-I15 5.6 10 Manganese 20.0 19.6 19.2 19.4 97 85-115 2.3 10 Molybdenum 50.0 48.5 49.8 44.1 98 80-115 2.6 10 99 82-i15 2.2 10 Nickel 5000 5010 4900 4950 Potassium 200.0 209 218 213 107 84-115 4.2 10 Selenium 5,0 4.25 4.34 4.30 86 62-115 2.2 10 Silver 10000 10100 9850 10000 100 85-115 2.8 10 Sodium 200 192 194 193 96 68-110 0.7 10 Thallium 400 464 375 419 105 80-122 21* 10 Tin 190 193 96 85-115 3.7 10 .4 196 200 .7 10 - 1 Titanium 50.0 48.3 47.5 47.9 96 85 115 Vanadium 50 45.5 45.3 45.4 91 82-115 0.6 10 Zinc RPD outside QC Limits `✓Calculations are performed before rounding to avoid round-off errors in calculated results.