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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />M1,C-04-01 <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.09 <br />0.23 <br />1.20 <br />8.40 <br />7.20 <br />03/13/13 <br />03/22/11 <br />Lab Cond. <br />1247.57 <br />353.43 <br />1306 <br />1610 <br />304 <br />03/18/14 <br />05/04/11 <br />TDS <br />877.86 <br />253.13 <br />880 <br />1100 <br />220 <br />07/31/13 <br />03/22/11 <br />Sulfate <br />295.79 <br />112.19 <br />502 <br />505 <br />3 <br />05/15/12 <br />03/22/11 <br />Calcium <br />125.07 <br />35.80 <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 />73.00 <br />23.37 <br />86 <br />95 <br />9 <br />05/19/14 <br />03/22/11 <br />Sodium <br />44.71 <br />14.40 <br />54 <br />59 <br />5 <br />11/19/13 <br />03/22/11 <br />Elevation <br />43.84 <br />2.98 <br />9.80 <br />48.64 <br />38.84 <br />11/29/17 <br />11/08/11 <br />Evaluation of 2017 data for MLC -04-01 Well <br />A maximum value for Well Elevation was recorded during 2017. Mining impacts <br />associated with the Collom expansion did not occur in 2017. <br />MC -04-01: <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 />0.16 <br />0.70 <br />8.30 <br />7.60 <br />03/13/13 <br />11/05/14 <br />Lab Cond. <br />941.86 <br />92.42 <br />412 <br />1160 <br />748 <br />05/23/13 <br />05/04/11 <br />TDS <br />649.64 <br />74.76 <br />300 <br />830 <br />530 <br />05/23/13 <br />09/18/17 <br />Sulfate <br />194.82 <br />50.44 <br />183 <br />308 <br />125 <br />05/19/14 <br />09/18/17 <br />Calcium <br />93.68 <br />9.65 <br />38 <br />117 <br />79 <br />05/23/13 <br />09/18/17 <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 />64.39 <br />7.51 <br />32 <br />80 <br />48 <br />05/23/13 <br />09/18/17 <br />Sodium <br />16.89 <br />1.75 <br />8 <br />20 <br />12 <br />05/23/13 <br />09/13/16 <br />Elevation <br />24.46 <br />2.07 <br />9.08 <br />27.02 <br />17.94 <br />07/31/13 <br />05/19/14 <br />Evaluation of 2017 data for MC -04-01 Well <br />Minimum values for TDS, Sulfate, Calcium, and Magnesium were recorded during 2017. <br />Mining impacts associated with the Collom expansion did not occur in 2017. <br />Page 13 <br />