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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <br />Iron <br />0.90 <br />3.24 <br />28.99 <br />29 <br />0.01 <br />10/08/98 <br />10/21/02 <br />Magnesium <br />133.85 <br />25.86 <br />202 <br />217 <br />15 <br />10/08/98 <br />11/30/93 <br />Sodium <br />165.81 <br />25.92 <br />221 <br />240 <br />19 <br />10/08/98 <br />11/30/93 <br />Elevation <br />6329.65 <br />2.86 <br />14 <br />6339.09 <br />6325.09 <br />10/03/00 <br />03/28/91 <br />Evaluation of 2014 data for the Gossard Well <br />Minimum values for Sulfate were recorded during 2014. Trend line analysis determined <br />no significant 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 />7.88 <br />0.22 <br />0.80 <br />8.20 <br />7.40 <br />05/21/13 <br />11/10/08 <br />Lab Cond. <br />2644.29 <br />204.62 <br />840 <br />2910 <br />2070 <br />03/19/14 <br />05105110 <br />TDS <br />2178.57 <br />78.49 <br />310 <br />2330 <br />2020 <br />03/17/09 <br />08/17/11 <br />Sulfate <br />877.19 <br />77.62 <br />332 <br />1090 <br />758 <br />08/02/12 <br />05/14/12 <br />Calcium <br />209.14 <br />20.47 <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 />198.39 <br />13.74 <br />72 <br />219 <br />147 <br />03/17/09 <br />11 /10 /11 <br />Sodium <br />157.50 <br />17.90 <br />87 <br />181 <br />94 <br />03/13/12 <br />08/13/08 <br />Elevation <br />6435.23 <br />0.76 <br />3.26 <br />6437.87 <br />6434.61 <br />05103111 <br />08/02/12 <br />Evaluation of 2014 data for MT -95 -02 Well <br />One result from 2014 sampling for conductivity was a maximum recorded value for the <br />monitoring period. Trend line analysis determined no significant correlations over time. <br />pH levels have been very stable during the monitoring period. <br />MLC- 04 -01: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.03 <br />0.28 <br />1.20 <br />8.40 <br />7.20 <br />03/13/13 <br />03/22/11 <br />Lab Cond. <br />1245 <br />406.90 <br />1306 <br />1610 <br />304 <br />03/18/14 <br />05/04/11 <br />TDS <br />885.63 <br />292.92 <br />880 <br />1100 <br />220 <br />07/31/13 <br />03/22/11 <br />Sulfate <br />304.25 <br />134.82 <br />502 <br />505 <br />3 <br />05/15/12 <br />03/22/11 <br />Calcium <br />128.63 <br />41.20 <br />124 <br />161 <br />37 <br />05/19/14 <br />03/22/11 <br />Iron <br />0.06 <br />0.05 <br />0.20 <br />0.25 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />73.81 <br />26.68 <br />86 <br />95 <br />9 <br />05/19/14 <br />03/22/11 <br />Sodium <br />46 <br />17.24 <br />54 <br />59 <br />5 <br />11/19/13 <br />03/22/11 <br />Elevation <br />42.18 <br />2.68 <br />8.61 <br />47.45 <br />38.84 <br />03/22/11 <br />11/08/11 <br />Evaluation of 2014 data for MLC -04 -01 Well <br />Maximum values for conductivity and magnesium were recorded in 2014. Trend line <br />analysis determined no significant correlations over time. <br />Page 2 -10 <br />