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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <br />. - I <br />Parameter <br />Mean <br />Std dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.02 <br />0.20 <br />0.8 <br />8.4 <br />7.6 <br />05/21/13 <br />11/10/08 <br />Lab Cond. <br />1229.22 <br />363.93 <br />1443 <br />2330 <br />887 <br />03/12/13 <br />0515110 <br />TDS <br />947.39 <br />353.27 <br />1420 <br />2040 <br />620 <br />03/12/13 <br />03/13/12 <br />Sulfate <br />343.30 <br />212.42 <br />804 <br />977 <br />173 <br />03/12/13 <br />08/03/10 <br />Calcium <br />121.52 <br />31.89 <br />129 <br />219 <br />90 <br />03/12/13 <br />06/18/08 <br />Iron <br />0.06 <br />0.06 <br />0.31 <br />0.36 <br />0.05 <br />11/10/08 <br />06/18/08 <br />Magnesium <br />100.83 <br />35.71 <br />142 <br />214 <br />72 <br />03/12/13 <br />03/13/12 <br />Sodium <br />17.83 <br />6.16 <br />24 <br />35 <br />11 <br />03/12/13 <br />03/13/12 <br />Elevation <br />7105.72 <br />5.13 <br />16.72 <br />7116.93 <br />7100.21 <br />06/18/08 <br />08/02/12 <br />Evaluation of 2014 data for A -8 Well <br />No results from 2014 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. No samples were taken during the fourth quarter of 2014 due to <br />the fact the well was dry at the time of sampling. <br />NGSW: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />7.78 <br />0.30 <br />1.7 <br />8.5 <br />6.8 <br />08/19/91 <br />10/03/00 <br />Lab Cond. <br />2010.18 <br />276.99 <br />1550 <br />2700 <br />1150 <br />10/17/91 <br />04/27/98 <br />TDS <br />1637.29 <br />250.66 <br />1320 <br />2100 <br />780 <br />08/13/08 <br />04/27/98 <br />Sulfate <br />770.27 <br />165.18 <br />1192 <br />1340 <br />148 <br />03/17/09 <br />05105110 <br />Calcium <br />170.09 <br />28.71 <br />169.3 <br />262 <br />92.7 <br />03/13/07 <br />10/08/98 <br />Iron <br />0.07 <br />0.08 <br />0.45 <br />0.46 <br />0.01 <br />08/14/97 <br />10/01/01 <br />Magnesium <br />169.05 <br />29.35 <br />194 <br />270 <br />76 <br />03/13/07 <br />04/27/98 <br />Sodium <br />92.81 <br />18.93 <br />140.3 <br />172 <br />31.7 <br />11/18/97 <br />04/27/98 <br />Elevation <br />6535.19 <br />1.76 <br />10 <br />6540.65 <br />6530.65 <br />03/13/93 <br />051 19/99 <br />Evaluation of 2014 data for NGSW <br />No results from 2014 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 />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 />7.94 <br />0.28 <br />1.6 <br />8.6 <br />7 <br />10/08/98 <br />10/21/02 <br />Lab Cond. <br />1941.18 <br />229.83 <br />990 <br />2350 <br />1360 <br />10/08/98 <br />03/29/85 <br />TDS <br />1424.57 <br />230.36 <br />848 <br />1810 <br />962 <br />10/08/98 <br />03/13/93 <br />Sulfate <br />538.34 <br />154.52 <br />833 <br />838 <br />5 <br />10/08/98 <br />05/20/14 <br />Calcium <br />111.38 <br />24.20 <br />190 <br />202 <br />12 <br />11 /10 /11 <br />11/30/93 <br />Page 2 -9 <br />