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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />LCG: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.44 <br />0.12 <br />0.6 <br />8.7 <br />8.1 <br />08/20/18 <br />03/14/12 <br />Lab Cond. <br />985.97 <br />131.66 <br />539 <br />1230 <br />691 <br />03/18/14 <br />05/04/11 <br />TDS <br />667.19 <br />92.05 <br />420 <br />860 <br />440 <br />11/01/12 <br />05/24/17 <br />Sulfate <br />197.38 <br />42.78 <br />188 <br />288 <br />100 <br />11/01/12 <br />05/24/17 <br />Calcium <br />98.56 <br />11.32 <br />39 <br />114 <br />75 <br />11/01/12 <br />05/24/17 <br />Iron <br />0.94 <br />1.46 <br />7.12 <br />7.17 <br />0.05 <br />04/26/16 <br />08/18/11 <br />Magnesium <br />65.75 <br />9.79 <br />40 <br />80 <br />40 <br />08/01/12 <br />05/24/17 <br />Sodium <br />26.50 <br />6.71 <br />27 <br />41 <br />14 <br />11/01/12 <br />03/22/11 <br />Flow rate <br />0.32 <br />0.47 <br />1.54 <br />1.57 <br />0.03 <br />05/04/11 <br />10/20/15 <br />Evaluation of'2018 data. or LGC <br />A minimum value for Lab pH was recorded during this period. Mining commenced on <br />the Collom Pit in the fall of 2018; therefore, not enough data has been acquired to <br />provide any reasonable analysis of the data acquired to date. <br />Rnfrm <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.44 <br />0.11 <br />0.6 <br />8.6 <br />8 <br />11/19/13 <br />03/14/12 <br />Lab Cond. <br />1235.40 <br />141.02 <br />858 <br />1740 <br />882 <br />03/22/11 <br />05/04/11 <br />TDS <br />905.00 <br />121.96 <br />680 <br />1450 <br />770 <br />03/22/11 <br />05/04/11 <br />Sulfate <br />328.37 <br />69.68 <br />415 <br />651 <br />236 <br />03/22/11 <br />11/08/11 <br />Calcium <br />119.03 <br />8.66 <br />39 <br />135 <br />96 <br />11/05/14 <br />09/18/17 <br />Iron <br />0.38 <br />0.64 <br />3.52 <br />3.57 <br />0.05 <br />05/04/11 <br />08/18/11 <br />Magnesium <br />101.17 <br />11.52 <br />64 <br />143 <br />79 <br />03/22/11 <br />05/04/11 <br />Sodium <br />19.20 <br />22.66 <br />126 <br />139 <br />13 <br />03/22/11 <br />11/29/17 <br />Flow rate <br />0.03 <br />0.03 <br />0.13 <br />0.13 <br />0.00 <br />05/15/11 <br />08/20/18 <br />Evaluation of 2018 data for WFJC <br />A minimum value for Flow rate was recorded in 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 />Page 9 <br />