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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />A-7 Well: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.04 <br />0.20 <br />0.7 <br />8.3 <br />7.6 <br />05/21/13 <br />11/10/08 <br />Lab Cond. <br />1513.95 <br />176.06 <br />1100 <br />2260 <br />1160 <br />06/18/08 <br />05/05/10 <br />TDS <br />1138.84 <br />230.02 <br />1160 <br />2100 <br />970 <br />06/18/08 <br />11/22/16 <br />Sulfate <br />424.30 <br />131.71 <br />782 <br />1110 <br />328 <br />06/18/08 <br />08/21/18 <br />Calcium <br />124.05 <br />19.59 <br />112 <br />214 <br />102 <br />05/03/11 <br />11/30/17 <br />Iron <br />0.05 <br />0.01 <br />0.05 <br />0.1 <br />0.05 <br />08/17/11 <br />06/18/08 <br />Magnesium <br />120.35 <br />27.13 <br />151 <br />244 <br />93 <br />06/18/08 <br />11/30/17 <br />Sodium <br />47.14 <br />6.82 <br />43 <br />77 <br />34 <br />06/18/08 <br />05/20/14 <br />Elevation <br />6888.57 <br />2.80 <br />14.63 <br />6899.69 <br />6885.06 <br />05/03/11 <br />10/31/12 <br />Evaluation of 2018 data for A-7 Well <br />A minimum value for Sulfate was recorded during 2018. Trend line analysis determined <br />no significant correlations over time. <br />A-8 Well: <br />Parameter <br />Mean <br />Std dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.07 <br />0.20 <br />0.8 <br />8.4 <br />7.6 <br />05/21/13 <br />11/10/08 <br />Lab Cond. <br />1256.31 <br />357.55 <br />1443 <br />2330 <br />887 <br />03/12/13 <br />05/5/10 <br />TDS <br />951.88 <br />355.02 <br />1420 <br />2040 <br />620 <br />03/12/13 <br />03/13/12 <br />Sulfate <br />351.13 <br />211.89 <br />804 <br />977 <br />173 <br />03/12/13 <br />08/03/10 <br />Calcium <br />121.28 <br />31.33 <br />129 <br />219 <br />90 <br />03/12/13 <br />06/18/08 <br />Iron <br />0.06 <br />0.05 <br />0.31 <br />0.36 <br />0.05 <br />11/10/08 <br />06/18/08 <br />Magnesium <br />103.47 <br />36.99 <br />142 <br />214 <br />72 <br />03/12/13 <br />03/13/12 <br />Sodium <br />17.53 <br />6.04 <br />24 <br />35 <br />11 <br />03/12/13 <br />03/13/12 <br />Elevation <br />7105.12 <br />4.84 <br />16.74 <br />7116.93 <br />7100.19 <br />06/18/08 <br />09/19/17 <br />Evaluation of 2018 data for A-8 Well <br />No results from 2018 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 />Page 11 <br />