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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />T TM. <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.56 <br />0.10 <br />0.4 <br />8.7 <br />8.3 <br />08/01/12 <br />03/22/11 <br />Lab Cond. <br />694.89 <br />156.74 <br />676 <br />1140 <br />464 <br />03/18/11 <br />04/26/16 <br />TDS <br />474.64 <br />120.17 <br />530 <br />820 <br />290 <br />03/22/11 <br />05/19/14 <br />Sulfate <br />112.36 <br />67.58 <br />272 <br />273 <br />1 <br />03/22/11 <br />11/08/11 <br />Calcium <br />76.46 <br />16.10 <br />63 <br />118 <br />55 <br />03/22/11 <br />05/19/14 <br />Iron <br />1.49 <br />2.19 <br />8.95 <br />9.0 <br />0.05 <br />04/26/16 <br />08/18/11 <br />Magnesium <br />45.93 <br />15.07 <br />70 <br />97 <br />27 <br />03/22/11 <br />05/19/14 <br />Sodium <br />12.07 <br />2.79 <br />11 <br />18 <br />7 <br />07/31/13 <br />05/19/14 <br />Flow rate <br />0.24 <br />0.40 <br />1.44 <br />1.44 <br />0 <br />04/26/16 <br />03/13/13 <br />Evaluation of 2018 data for UCG <br />No results from 2018 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Mining commenced on the Collom Pit in the <br />fall of 2018; therefore, not enough data has been acquired to provide any reasonable <br />analysis of the data acquired to date. <br />CJC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.42 <br />0.08 <br />0.4 <br />8.6 <br />8.2 <br />08/18/11 <br />03/14/12 <br />Lab Cond. <br />2019.06 <br />261.56 <br />1460 <br />2380 <br />920 <br />11/26/16 <br />03/22/11 <br />TDS <br />1551.88 <br />201.69 <br />1150 <br />1820 <br />670 <br />08/01/12 <br />03/22/11 <br />Sulfate <br />639.09 <br />122.95 <br />680 <br />859 <br />179 <br />11/21/16 <br />03/22/11 <br />Calcium <br />141.41 <br />15.71 <br />76 <br />178 <br />102 <br />08/01/12 <br />03/22/11 <br />Iron <br />0.42 <br />0.56 <br />2.56 <br />2.61 <br />0.05 <br />11/27/18 <br />08/18/11 <br />Magnesium <br />158.47 <br />22.52 <br />130 <br />199 <br />69 <br />11/21/16 <br />03/22/11 <br />Sodium <br />136.06 <br />24.01 <br />140 <br />167 <br />27 <br />08/01/12 <br />03/22/11 <br />Flow rate <br />0.06 <br />0.06 <br />0.21 <br />0.22 <br />0.01 <br />05/15/12 <br />08/20/18 <br />Evaluation of 2018 data for CJC <br />A maximum value for Iron was recorded in 2018. A minimum value for Flow rate was <br />recorded during 2018. Mining commenced on the Collom Pit in the fall of 2018; <br />therefore, not enough data has been acquired to provide any reasonable analysis of the <br />data acquired to date. <br />Page 8 <br />