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Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend - <br />Lab pH <br />8.42 <br />0.11 <br />0.5 <br />8.6 <br />8.1 <br />6/18/08 <br />11/2/09 <br />Decreasing <br />Lab Cond. <br />928.37 <br />215.82 <br />907 <br />1210 <br />303 <br />11/10/11 <br />4/15/08 <br />Increasing <br />TDS <br />690.00 <br />119.83 <br />460 <br />880 <br />420 <br />11/8/07 <br />6/03/09 <br />Increasing <br />Sulfate <br />210.95 <br />66.65 <br />258 <br />339 <br />81 <br />10/31/12 <br />6/03/09 <br />Increasing <br />Calcium <br />96.85 <br />14.82 <br />58 <br />121 <br />63 <br />11 /10 /11 <br />5/12/08 <br />Decreasing <br />Iron <br />1.47 <br />2.11 <br />7.85 <br />7.9 <br />0.05 <br />3/17/09 <br />10/31/12 <br />Increasing <br />Magnesium <br />76.15 <br />17.91 <br />66 <br />101 <br />35 <br />10/31/12 <br />5/12/08 <br />Increasing <br />Sodium <br />10.24 <br />3.00 <br />13 <br />19 <br />6 <br />2/23/10 <br />6/18/08 <br />Increasing <br />Flow rate <br />0.87 <br />1.23 <br />5.84 <br />5.86 <br />0.02 <br />5/12/08 <br />10/31/12 <br />Increasing <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />8.05 <br />0.25 <br />2.5 <br />8.6 <br />6.1 <br />08/19/91 <br />05/14/91 <br />Increasing <br />Lab Cond. <br />1700.30 <br />311.84 <br />2659 <br />2820 <br />161 <br />01/19/93 <br />06/23/92 <br />Increasing <br />TDS <br />1342.42 <br />342.40 <br />3420 <br />4050 <br />630 <br />11/08/00 <br />05/23/95 <br />Increasing <br />Sulfate <br />645.07 <br />159.23 <br />710 <br />945 <br />235 <br />12/04/89 <br />05/20/97 <br />Decreasing <br />Calcium <br />140.32 <br />24.86 <br />198 <br />208 <br />10 <br />12/28/89 <br />3/13/84 <br />Level <br />Iron <br />0.66 <br />0.92 <br />8.81 <br />8.84 <br />0.03 <br />08/13/08 <br />02/01/88 <br />Increasing <br />Magnesium <br />144.45 <br />29.77 <br />225.3 <br />226 <br />0.7 <br />12/04/89 <br />05/20/97 <br />Level <br />Sodium <br />75.05 <br />29.91 <br />195.3 <br />215 <br />19.7 <br />08/02/12 <br />04/17/00 <br />Increasing <br />Flow rate <br />4.06 <br />5.21 <br />46.94 <br />47 <br />0.06 <br />04/27/98 <br />12/06/99 <br />Decreasing <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />8.10 <br />0.27 <br />1.6 <br />8.6 <br />7 <br />02/25/91 <br />02/22/89 <br />Increasing <br />Lab Cond. <br />1625.74 <br />484.06 <br />3410 <br />3610 <br />200 <br />11 /10 /11 <br />02/28/90 <br />Increasing <br />TDS <br />1196.79 <br />455.56 <br />2766 <br />2910 <br />144 <br />11 /10 /11 <br />02/28/90 <br />Increasing <br />Sulfate <br />552.76 <br />269.15 <br />1591 <br />1610 <br />19 <br />11/10/11 <br />02/28/90 <br />Increasing <br />Calcium <br />93.49 <br />27.50 <br />133.2 <br />159 <br />25.8 <br />11/10/11 <br />02/05/01 <br />Increasing <br />Iron <br />4.68 <br />18.09 <br />131.99 <br />132 <br />0.01 <br />02/28/90 <br />09/13/95 <br />Decreasing <br />Magnesium <br />119.70 <br />45.94 <br />230 <br />238 <br />8 <br />10/12/88 <br />02/28/90 <br />Increasing <br />Sodium <br />111.89 <br />83.61 <br />477 <br />483 <br />6 <br />11/10/11 <br />02/28/90 <br />Increasing <br />Flow rate <br />0.37 <br />0.83 <br />6.3 <br />6.3 <br />0 <br />04/29/86 <br />12/13/02 <br />Decreasing <br />Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />LGSC: <br />UWFGSC: <br />LTC: <br />Colowyo currently samples each ground water 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 -4 <br />