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_"*4** COLORADO LEGACY LAND <br /> $CHWARTZWALDER MINE <br /> _.. OF ALDER MINE POOL CONCENTRA <br /> Number Number Percent Standard Pre-2017 <br /> Variable Units of of Non- of Non- Minimum Maximum Mean' Median' Deviation Sample Data <br /> Sample Detects Detects <br /> March 2018 to September 2020 Mine Pool Sample Data -Meanz <br /> General Parameters <br /> Bicarbonate as CaCO3 mg/L 18 0 0% 491 950 360 843 136 374 <br /> Calcium mg/L 19 0 0% 153 352 144 316 54 299 <br /> Chloride mg/L 32 0 0% 8 54.7 34 43 8.92 31 <br /> Conductivity Field µS/cm 7 0 0% 2680 5131 634 3250 839 3319 <br /> Oxidation Reduction Potential my 4 0 0% -136 147 -5.81 -119 118 193 <br /> pH Field S.U. 8 0 1 0% 6.82 7.59 1.50 7.39 1 0.21 7.19 <br /> Phosphorus mg/L 19 3 8% 0.03 0.7 0.09 0.17 0.15 0.15 <br /> Potassium mg/L 19 0 0% 15 31.7 13 27 4.56 17.2 <br /> Sodium mg/L 19 0 0% 139 284 111 225 40 197 <br /> Sulfate mg/L 32 0 0% 408 1790 1091 1395 285 1725 <br /> TDS-Total Dissolved Solids mg/L 22 0 0% 960 3390 1581 2955 534 2917 <br /> Temperature Deg C 7 0 0% 1 7.8 1 21.2 2.93 1 17.2 1 3.83 1 17.2 <br /> Dissolved Metals <br /> Aluminum mg/L 19 18 46% 0.17 0.17 0.021 0.03 0.03 0.15 <br /> Antimony mg/L 19 18 46% 0.0012 0.0012 0.0019 0.0004 0.01 0.014 <br /> Copper mg/L 19 19 49% 0 0 0.0041 0.01 0.00 0.01 <br /> Iron mg/L 32 0 0% 0.09 10.7 2.98 3.12 2.89 0.02 <br /> Lead mg/L 16 16 41% 0 0 0.00016 0.0001 0.00 0.0003 <br /> Magnesium mg/L 19 0 1 0% 112 280 112 239 46 224 <br /> Manganese mg/L 32 0 0% 0.252 1 0.604 0.733 0.12 2.05 <br /> Mercury mg/L 9 9 23% 0 0 2.3E-05 0.0001 0.00 0.00036 <br /> Molybdenum mg/L 32 0 0% 0.0371 1.4 0.450 0.54 0.37 1.85 <br /> Silver mg/L 19 19 49% 0 0 0.00073 0.0001 0.00 0.0034 <br /> Thallium mg/L 19 18 46% 0.0003 0.0003 0.00023 0.0001 0.00 0.0249 <br /> Uranium mg/L 1 32 1 0 1 0% 3.95 16 9.39 12 2.55 41 <br /> JUNE 2021 22 AMENDMENT <br />