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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />►I V I W69059ilz <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.11 <br />0.22 <br />1.20 <br />8.40 <br />7.20 <br />03/13/13 <br />03/22/11 <br />Lab Cond. <br />1212.06 <br />351.00 <br />1306 <br />1610 <br />304 <br />03/18/14 <br />05/04/11 <br />TDS <br />848.13 <br />252.29 <br />880 <br />1100 <br />220 <br />07/31/13 <br />03/22/11 <br />Sulfate <br />281.53 <br />112.53 <br />502 <br />505 <br />3 <br />05/15/12 <br />03/22/11 <br />Calcium <br />121.59 <br />35.02 <br />124 <br />161 <br />37 <br />05/19/14 <br />03/22/11 <br />Iron <br />0.05 <br />0.04 <br />0.25 <br />0.25 <br />0.002 <br />03/14/12 <br />08/03/15 <br />Magnesium <br />71.00 <br />22.82 <br />86 <br />95 <br />9 <br />05/19/14 <br />03/22/11 <br />Sodium <br />45.16 <br />15.19 <br />73 <br />78 <br />5 <br />11/27/18 <br />03/22/11 <br />Elevation <br />43.71 <br />5.01 <br />27.41 <br />50.16 <br />22.75 <br />11/28/18 <br />03/13/18 <br />Evaluation of 2018 data for MLC -04-01 Well <br />A minimum value for Well Elevation was recorded during 2018. Maximum values for <br />Sodium and Well Elevation were recorded during 2018. Mining commenced on the <br />Collom Pit in the fall of 2018; therefore, not enough data has been acquired to provide <br />any reasonable analysis of the data acquired to date. <br />I►TTaxiLIrIj9 <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.13 <br />0.16 <br />0.80 <br />8.40 <br />7.60 <br />11/27/18 <br />11/05/14 <br />Lab Cond. <br />925.00 <br />114.76 <br />634 <br />1160 <br />526 <br />05/23/13 <br />11/27/18 <br />TDS <br />632.50 <br />94.43 <br />500 <br />830 <br />330 <br />05/23/13 <br />11/27/18 <br />Sulfate <br />187.75 <br />53.37 <br />231 <br />308 <br />77 <br />05/19/14 <br />11/27/18 <br />Calcium <br />91.66 <br />12.37 <br />69 <br />117 <br />48 <br />05/23/13 <br />11/27/18 <br />Iron <br />0.05 <br />0.02 <br />0.13 <br />0.18 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />60.47 <br />10.12 <br />57 <br />80 <br />23 <br />05/23/13 <br />11/27/18 <br />Sodium <br />16.81 <br />1.77 <br />8 <br />20 <br />12 <br />05/23/13 <br />09/13/16 <br />Elevation <br />25.23 <br />4.85 <br />30.88 <br />48.82 <br />17.94 <br />03/13/18 <br />05/19/14 <br />Evaluation of 2018 data for MC -04-01 Well <br />Minimum values for Lab Conductivity, TDS, Sulfate, Calcium, and Magnesium were <br />recorded during 2018. Maximum values for Lab pH and Well Elevation were recorded <br />during 2018. Mining commenced on the Collom Pit in the fall of 2018; therefore, not <br />enough data has been acquired to provide any reasonable analysis of the data acquired to <br />date. <br />Page 14 <br />