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COLORADO LEGACY LAND <br /> SCHWARTZWALDER MINE <br /> F SCHWARTZWALDER ENT <br /> Number Number Percent June 2000 to <br /> of of Non- of Non- Minimum' Maximum Meant Median2 Standard July 2007 <br /> Variable Units Samples Detects Detects Deviation Sample Data- <br /> Mean <br /> March 2018 to July 2021 Mine Pool Sample Data <br /> General Parameters <br /> Bicarbonate mg/L 21 0 0% 491 950 790 846 128 374 <br /> as CaCO3 <br /> Calcium mg/L 22 0 0% 153 352 302 321 53 299 <br /> Chloride mg/L 35 0 0% 8 55 43 43 9.2 31 <br /> Conductivity [IS/cm 9 0 0% 2,680 5,131 3,510 3,351 742 3,319 <br /> Field <br /> Oxidation <br /> Reduction my 6 0 0% -158 147 -84 -121 104 193 <br /> Potential <br /> pH Field S.U. 10 0 0% 6.8 7.6 7.3 7.4 0.24 7.19 <br /> Phosphorus mg/L 11 3 27% 0.15 0.40 0.19 0.20 0.09 0.15 <br /> Potassium mg/L 22 0 0% 15 31.7 27 28 4.5 17.2 <br /> Sodium mg/L 22 0 0% 139 297 235 231 43 197 <br /> Sulfate mg/L 35 0 0% 408 1,790 1,362 1,420 293 1,725 <br /> TDS-Total <br /> Dissolved mg/L 24 0 0% 960 3,470 2,850 2,960 535 2,917 <br /> Solids <br /> Temperature Deg C 9 0 0% 7.8 22 17 18 3.8 17.2 <br /> Dissolved Metals <br /> Aluminum mg/L 22 21 95% 0.17 0.17 - - 70.008 <br /> 0.15 <br /> Antimony mg/L 22 21 95% 0.0012 0.0012 - - 0.014 <br /> Arsenic mg/L 35 1 3% 0.002 0.0311 0.013 0.011 0.0036 <br /> Copper mg/L 22 20 91% 0.021 0.021 0.010 <br /> Iron mg/L 35 0 0% 0.090 11 4.1 3.7 1 0.020 <br /> Lead mg/L 19 19 1 100% - - - - 0.00030 <br /> Magnesium4 mg/L 22 0 0% 1 112 280 236 1 247 45 224 <br /> AUGUsr2020 29 AMENDMENT6 <br />