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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <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 />8.05 <br />0.18 <br />0.70 <br />8.30 <br />7.60 <br />03/13/13 <br />11/05/14 <br />Lab Cond. <br />973.13 <br />96.61 <br />412 <br />1160 <br />748 <br />05/23/13 <br />05/04/11 <br />TDS <br />690 <br />57.04 <br />230 <br />830 <br />600 <br />05/23/13 <br />05/04/11 <br />Sulfate <br />221.25 <br />44.08 <br />158 <br />308 <br />150 <br />05/19/14 <br />05/04/11 <br />Calcium <br />98.31 <br />7.93 <br />29 <br />117 <br />88 <br />05/23/13 <br />03/22/11 <br />Iron <br />0.06 <br />0.03 <br />0.13 <br />0.18 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />66 <br />5.84 <br />22 <br />80 <br />58 <br />05/23/13 <br />05/04/11 <br />Sodium <br />17.75 <br />1.06 <br />4 <br />20 <br />16 <br />05/23/13 <br />05/04/11 <br />Elevation <br />23.95 <br />2.39 <br />9.08 <br />27.02 <br />17.94 <br />07/31/13 <br />05/19/14 <br />Evaluation of 2014 data for MC -04 -01 Well <br />One result from 2014 sampling for sulfate was a maximum recorded value for the <br />monitoring period. Minimum values for pH and depth to water (elevation) were recorded <br />in 2014. Trend line analysis determined no significant correlations over time. <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 />8.06 <br />0.16 <br />0.70 <br />8.30 <br />7.60 <br />03/13/13 <br />11/05/14 <br />Lab Cond. <br />1343.13 <br />102.16 <br />380 <br />1490 <br />1110 <br />08/27/14 <br />05/04/11 <br />TDS <br />930 <br />51.12 <br />190 <br />1010 <br />820 <br />11/01/12 <br />05/23/13 <br />Sulfate <br />283.44 <br />23.64 <br />78 <br />321 <br />243 <br />11/01/12 <br />11/08/11 <br />Calcium <br />133.44 <br />11.18 <br />47 <br />148 <br />101 <br />08/27/14 <br />03/13/13 <br />Iron <br />0.10 <br />0.19 <br />0.77 <br />0.82 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />83.75 <br />6.88 <br />28 <br />92 <br />64 <br />08/27/14 <br />03/13/13 <br />Sodium <br />61.63 <br />21.52 <br />84 <br />127 <br />443 <br />03/13/13 <br />08/01/12 <br />Elevation <br />11.40 <br />0.70 <br />2.16 <br />12.32 <br />10.16 <br />11/01/12 <br />05/04/11 <br />Evaluation of2014 data for MC -04 -02 Well <br />Maximum values for conductivity, calcium, and magnesium were recorded during 2014. <br />One result from 2014 sampling for pH was a minimum recorded value for the monitoring <br />period. Trend line analysis determined no significant correlations over time. <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 />7.92 <br />0.21 <br />0.90 <br />8.20 <br />7.30 <br />03/13/13 <br />11/05/14 <br />Lab Cond. <br />1281.25 <br />102.62 <br />350 <br />1420 <br />1070 <br />08/27/14 <br />05/04/11 <br />TDS <br />860 <br />49.67 <br />200 <br />940 <br />740 <br />08/18/11 <br />05/23/13 <br />Sulfate <br />252.50 <br />19.77 <br />63 <br />277 <br />214 <br />08/18/11 <br />05/23/13 <br />Calcium <br />122.69 <br />3.91 <br />14 <br />131 <br />117 <br />05/19/14 <br />11/19/13 <br />Page 2 -11 <br />