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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />Gossard 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 />7.98 <br />0.29 <br />1.6 <br />8.6 <br />7 <br />10/08/98 <br />10/21/02 <br />Lab Cond. <br />1985.79 <br />256.56 <br />1310 <br />2670 <br />1360 <br />11/22/16 <br />03/29/85 <br />TDS <br />1469.51 <br />255.38 <br />1238 <br />2200 <br />962 <br />09/13/16 <br />03/13/93 <br />Sulfate <br />566.43 <br />168.75 <br />1025 <br />1030 <br />5 <br />11/22/16 <br />05/20/14 <br />Calcium <br />113.58 <br />24.44 <br />190 <br />202 <br />12 <br />11/10/11 <br />11/30/93 <br />Iron <br />0.80 <br />3.06 <br />28.99 <br />29 <br />0.01 <br />10/08/98 <br />10/21/02 <br />Magnesium <br />136.79 <br />26.47 <br />202 <br />217 <br />15 <br />10/08/98 <br />11/30/93 <br />Sodium <br />167.15 <br />25.15 <br />221 <br />240 <br />19 <br />10/08/98 <br />11/30/93 <br />Elevation <br />6329.90 <br />2.82 <br />14 <br />6339.09 <br />6325.09 <br />10/03/00 <br />03/28/91 <br />Evaluation of 2018 data for the Gossard 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 />MT -95-02 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 />7.95 <br />0.22 <br />0.90 <br />8.30 <br />7.40 <br />08/21/18 <br />11/10/08 <br />Lab Cond. <br />2735.23 <br />223.17 <br />1000 <br />3070 <br />2070 <br />03/14/18 <br />05/05/10 <br />TDS <br />2200.45 <br />80.66 <br />320 <br />2340 <br />2020 <br />11/30/17 <br />08/17/11 <br />Sulfate <br />894.98 <br />69.11 <br />332 <br />1090 <br />758 <br />08/02/12 <br />05/14/12 <br />Calcium <br />204.57 <br />18.09 <br />110 <br />231 <br />121 <br />03/17/09 <br />11/10/11 <br />Iron <br />0.05 <br />0.00 <br />0.01 <br />0.06 <br />0.05 <br />11/10/08 <br />11/02/09 <br />Magnesium <br />198.25 <br />13.17 <br />74 <br />221 <br />147 <br />11/22/16 <br />11/10/11 <br />Sodium <br />173.20 <br />29.25 <br />147 <br />241 <br />94 <br />05/01/18 <br />08/13/08 <br />Elevation <br />6435.23 <br />0.63 <br />3.26 <br />6437.87 <br />6434.61 <br />05/03/11 <br />08/02/12 <br />Evaluation of 2018 data for MT -95-02 Well <br />Maximum values for Lab pH, Lab Conductivity, and Sodium were recorded during 2018. <br />Trend line analysis determined no significant correlations over time. <br />Page 13 <br />