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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <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 />7.83 <br />0.30 <br />1.7 <br />8.5 <br />6.8 <br />08/19/91 <br />10/03/00 <br />Lab Cond. <br />2064.64 <br />297.58 <br />1550 <br />2700 <br />1150 <br />10/17/91 <br />04/27/98 <br />TDS <br />1675.46 <br />256.23 <br />1410 <br />2190 <br />780 <br />04/27/16 <br />04/27/98 <br />Sulfate <br />786.09 <br />160.82 <br />1192 <br />1340 <br />148 <br />03/17/09 <br />05/05/10 <br />Calcium <br />171.62 <br />28.01 <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 />171.49 <br />28.84 <br />194 <br />270 <br />76 <br />03/13/07 <br />04/27/98 <br />Sodium <br />98.35 <br />23.70 <br />151.3 <br />183 <br />31.7 <br />03/14/18 <br />04/27/98 <br />Elevation <br />6535.02 <br />1.79 <br />10 <br />6540.65 <br />6530.65 <br />03/13/93 <br />05/19/99 <br />Evaluation of 2018 data for NGSW <br />A maximum value for Sodium was recorded during 2018. Trend line analysis determined <br />no significant correlations over time. <br />Page 12 <br />