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Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <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 />8.05 <br />0.20 <br />0.8 <br />8.4 <br />7.6 <br />05/21/13 <br />11/10/08 <br />Lab Cond. <br />1246.62 <br />367.20 <br />1443 <br />2330 <br />887 <br />03/12/13 <br />05/5/10 <br />TDS <br />941.03 <br />355.11 <br />1420 <br />2040 <br />620 <br />03/12/13 <br />03/13/12 <br />Sulfate <br />345.31 <br />213.52 <br />804 <br />977 <br />173 <br />03/12/13 <br />08/03/10 <br />Calcium <br />120.34 <br />31.73 <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 />102.76 <br />37.65 <br />142 <br />214 <br />72 <br />03/12/13 <br />03/13/12 <br />Sodium <br />17.59 <br />6.28 <br />24 <br />35 <br />11 <br />03/12/13 <br />03/13/12 <br />Elevation <br />7105.30 <br />4.95 <br />16.74 <br />7116.93 <br />7100.19 <br />06/18/08 <br />09/19/17 <br />Evaluation of 2017 data for A-8 Well <br />A minimum value for Well Elevation was recorded during 2017. Trend line analysis <br />determined no significant correlations over time. <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 />7.82 <br />0.30 <br />1.7 <br />8.5 <br />6.8 <br />08/19/91 <br />10/03/00 <br />Lab Cond. <br />2056.82 <br />298.27 <br />1550 <br />2700 <br />1150 <br />10/17/91 <br />04/27/98 <br />TDS <br />1669.77 <br />258.14 <br />1410 <br />2190 <br />780 <br />04/27/16 <br />04/27/98 <br />Sulfate <br />784.54 <br />162.43 <br />1192 <br />1340 <br />148 <br />03/17/09 <br />05/05/10 <br />Calcium <br />171.86 <br />27.87 <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 />171.67 <br />29.08 <br />194 <br />270 <br />76 <br />03/13/07 <br />04/27/98 <br />Sodium <br />96.66 <br />21.65 <br />140.3 <br />172 <br />31.7 <br />11/18/97 <br />04/27/98 <br />Elevation <br />6535.06 <br />1.79 <br />10 <br />6540.65 <br />6530.65 <br />03/13/93 <br />05/19/99 <br />Evaluation of 2017 data for NGSW <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 />Page 11 <br />