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Colowyo Coal Company <br />2014 Annual Reclamation and Hydrology Report <br />LCG: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.39 <br />0.13 <br />0.4 <br />8.5 <br />8.1 <br />03/13/13 <br />03/14/12 <br />Lab Cond. <br />1006.75 <br />145.68 <br />539 <br />1230 <br />691 <br />03/18/14 <br />05/04/11 <br />TDS <br />700.63 <br />83.62 <br />310 <br />860 <br />550 <br />11/01/12 <br />05/04/11 <br />Sulfate <br />219.63 <br />41.22 <br />147 <br />288 <br />141 <br />11/01/12 <br />05/04/11 <br />Calcium <br />101.63 <br />11.12 <br />34 <br />114 <br />80 <br />11/01/12 <br />05/04/11 <br />Iron <br />0.81 <br />1.13 <br />3.27 <br />3.32 <br />0.05 <br />05/04/11 <br />08/18/11 <br />Magnesium <br />69.75 <br />8.99 <br />29 <br />80 <br />51 <br />08/01/12 <br />05/04/11 <br />Sodium <br />29.63 <br />7.30 <br />27 <br />41 <br />14 <br />11/01/12 <br />03/22/11 <br />Flow rate <br />0.35 <br />0.48 <br />1.53 <br />1.57 <br />0.04 <br />05/04/11 <br />03/22/11 <br />Evaluation of 2014 data for LGC <br />A maximum value for conductivity was recorded in 2014. A minimum value for pH was <br />recorded in 2014. Trend line analysis determined no significant correlations over time. <br />WFJC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.41 <br />0.13 <br />0.6 <br />8.6 <br />8 <br />11/19/13 <br />03/14/12 <br />Lab Cond. <br />1217.63 <br />177.72 <br />858 <br />1740 <br />882 <br />03/22/11 <br />05/04/11 <br />TDS <br />920.00 <br />158.45 <br />680 <br />1450 <br />770 <br />03/22/11 <br />05/04/11 <br />Sulfate <br />325.88 <br />94.98 <br />415 <br />651 <br />236 <br />03/22/11 <br />11/08/11 <br />Calcium <br />118.88 <br />8.32 <br />28 <br />135 <br />107 <br />11/05/14 <br />05/04/11 <br />Iron <br />0.42 <br />0.86 <br />3.52 <br />3.57 <br />0.05 <br />05/04/11 <br />08/18/11 <br />Magnesium <br />101.63 <br />13.81 <br />64 <br />143 <br />79 <br />03/22/11 <br />05/04/11 <br />Sodium <br />23.38 <br />30.86 <br />126 <br />139 <br />13 <br />03/22/11 <br />05/04/11 <br />Flow rate <br />0.04 <br />0.04 <br />0.12 <br />0.13 <br />0.01 <br />05115111 <br />11/01/12 <br />Evaluation of 2014 data for WFJC <br />A maximum value for calcium was recorded in 2014. Trend line analysis determined no <br />significant correlations over time. <br />GENERAL TRENDS - Groundwater <br />Colowyo currently samples each groundwater site for a variety of quality parameters. Of <br />all the parameters that are analyzed for, several key indicator parameters are identified. <br />These are lab pH, lab conductivity, TDS, sulfate, calcium, iron, magnesium, sodium and <br />elevation. Statistical analysis is completed and illustrates historical trends for each <br />parameter in Exhibit 2B. <br />Page 2 -7 <br />