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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />MC -04-02: <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 />0.80 <br />8.40 <br />7.60 <br />09/18/17 <br />11/05/14 <br />Lab Cond. <br />1343.57 <br />90.73 <br />380 <br />1490 <br />1110 <br />08/27/14 <br />05/04/11 <br />TDS <br />906.43 <br />72.79 <br />330 <br />1010 <br />680 <br />11/01/12 <br />09/18/17 <br />Sulfate <br />275.43 <br />26.19 <br />110 <br />321 <br />211 <br />11/01/12 <br />09/18/17 <br />Calcium <br />128.54 <br />13.52 <br />52 <br />148 <br />96 <br />08/27/14 <br />09/18/17 <br />Iron <br />0.08 <br />0.15 <br />0.77 <br />0.82 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />81.11 <br />8.68 <br />33 <br />92 <br />59 <br />08/27/14 <br />09/18/17 <br />Sodium <br />61.57 <br />20.99 <br />90 <br />127 <br />37 <br />03/13/13 <br />11/29/17 <br />Elevation <br />11.25 <br />0.95 <br />4.52 <br />14.13 <br />9.61 <br />01/12/15 <br />05/24/17 <br />Evaluation of 2017 data for MC -04-02 W <br />A maximum value for Lab pH was recorded in 2017. Minimum values for TDS, Sulfate, <br />Calcium, Magnesium, Sodium and Well Elevation was recorded during 2017. Mining <br />impacts associated with the Collom expansion did not occur in 2017. <br />MJ -95-01: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />7.99 <br />0.19 <br />0.90 <br />8.20 <br />7.30 <br />03/13/13 <br />11/05/14 <br />Lab Cond. <br />1296.07 <br />86.34 <br />350 <br />1420 <br />1070 <br />08/27/14 <br />05/04/11 <br />TDS <br />850.36 <br />58.21 <br />220 <br />940 <br />720 <br />08/18/11 <br />09/18/17 <br />Sulfate <br />249.25 <br />17.28 <br />63 <br />277 <br />214 <br />08/18/11 <br />05/23/13 <br />Calcium <br />120.75 <br />4.46 <br />18 <br />131 <br />113 <br />05/19/14 <br />05/24/17 <br />Iron <br />0.08 <br />0.06 <br />0.25 <br />0.30 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />94.14 <br />4.08 <br />14 <br />101 <br />87 <br />05/19/14 <br />03/14/12 <br />Sodium <br />29.36 <br />1.97 <br />9 <br />32 <br />23 <br />08/18/11 <br />05/24/17 <br />Elevation <br />14.46 <br />2.94 <br />16.31 <br />24.29 <br />7.98 <br />11/08/11 <br />05/04/11 <br />Evaluation of 2017 data for MJ -95-01 Well <br />Minimum values for TDS, Calcium, and Sodium were recorded in 2017. Mining impacts <br />associated with the Collom expansion did not occur in 2017. <br />Page 14 <br />