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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />UWFGSC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.47 <br />0.11 <br />0.5 <br />8.6 <br />8.1 <br />06/18/08 <br />11/2/09 <br />Lab Cond. <br />953.47 <br />218.27 <br />1027 <br />1330 <br />303 <br />03/19/14 <br />04/15/08 <br />IDS <br />691.22 <br />138.89 <br />530 <br />910 <br />380 <br />03/19/14 <br />05/20/14 <br />Sulfate <br />218.55 <br />70.61 <br />260 <br />341 <br />81 <br />07/30/13 <br />06/03/09 <br />Calcium <br />96.81 <br />14.94 <br />59 <br />121 <br />62 <br />11/10/11 <br />05/12/08 <br />Iron <br />1.43 <br />2.20 <br />9.81 <br />9.86 <br />0.05 <br />04/27/16 <br />10/31/12 <br />Magnesium <br />76.04 <br />19.03 <br />70 <br />103 <br />33 <br />11/18/13 <br />05/20/14 <br />-Magnesium <br />Sodium <br />9.49 <br />2.74 <br />14 <br />19 <br />5 <br />02/23/10 <br />04/27/16 <br />Flow rate <br />1.06 <br />1.67 <br />6.23 <br />6.25 <br />0.02 <br />04/27/16 <br />10/31/12 <br />Evaluation of 2017 data for UWFGSC <br />No results from 2017 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Trend line analysis determined no significant <br />correlations over time. <br />LTC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.15 <br />0.30 <br />1.7 <br />8.7 <br />7 <br />09/13/16 <br />02/22/89 <br />Lab Cond. <br />1745.26 <br />596.97 <br />3480 <br />3680 <br />200 <br />11/30/17 <br />02/28/90 <br />TDS <br />1385.67 <br />577.14 <br />2766 <br />2910 <br />144 <br />11/10/11 <br />02/28/90 <br />Sulfate <br />660.57 <br />332.66 <br />1591 <br />1610 <br />19 <br />11/10/11 <br />02/28/90 <br />Calcium <br />95.10 <br />26.04 <br />133.2 <br />159 <br />25.8 <br />11/10/11 <br />02/05/01 <br />Iron <br />3.92 <br />16.22 <br />131.99 <br />132 <br />0.01 <br />02/28/90 <br />09/13/95 <br />Magnesium <br />123.46 <br />42.03 <br />230 <br />238 <br />8 <br />10/12/88 <br />02/28/90 <br />Sodium <br />168.98 <br />142.12 <br />589 <br />595 <br />6 <br />09/19/17 <br />02/28/90 <br />Flow rate <br />0.36 <br />0.80 <br />6.3 <br />6.3 <br />0 <br />04/29/86 <br />12/13/02 <br />Evaluation of 2017 data for LTC <br />Maximum values for Lab Conductivity and Sodium were recorded during 2017. Trend <br />line analysis determined no significant correlations over time. <br />Page 7 <br />