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Colowyo Coal Company <br />2010Annual Reclamation and Hydrology Report <br />Gossard Well: <br />Parameter Mean Std <br />dev Range Max. Min. Max at Min at Trend <br />Lab pH 7.91 0.28 1.6 8.6 7 10/08/98 10/21/02 Decreasing <br />Lab Cond. 1914.74 225.78 990 2350 1360 10/08/98 03/29/85 Increasing <br />TDS 796.28 563.76 848 1810 962 10/08/98 03/13/93 Increasing <br />Sulfate 531.38 138.72 719 838 119 10/08/98 8/19/09 Increasing <br />Calcium 108.66 23.63 169 181 12 10/08/98 11/30/93 Increasing <br />Iron 1.06 3.52 28.99 29 0.01 10/08/98 10/21/02 Decreasing <br />Magnesium 131.09 26.21 202 217 15 10/08/98 11/30/93 Increasing <br />Sodium 163.46 26.78 221 240 19 10/08/98 11/30/93 Increasing <br />Elevation 6329.31 2.92 14 6339.09 6325.09 10/03/00 03/28/91 Increasing <br />MT-95-02 Well: <br />• <br />• <br />Parameter Mean Sted Range Max. Min. Max at Min at Trend <br />Lab pH 7.77 0.18 0.6 8.0 7.4 8/19/09 11/10/08 Increasing <br />Lab Cond. 2639.17 218.9 210 2860 2650 6/03/09 11/02/09 Decreasing <br />TDS 2222.50 78.99 290 2330 2040 3/17/09 11/02/09 Decreasing <br />Sulfate 917 45.29 137 968 831 8/19/09 11/10/08 Increasing <br />Calcium 217 11.35 30 231 201 3/17/09 6/18/08 Decreasing <br />Iron 0.05 0.004 0.01 0.06 0.05 11/10/08 11/2/09 Decreasing <br />Magnesium 203.92 9.86 27 219 192 3/17/09 11/2/09 Increasing <br />Sodium 145.33 17.73 69 163 94 6/03/09 8/13/08 Increasing <br />Elevation 6436.18 1.75 3.08 6437.76 6434.68 11/2/09 8/19/09 Increasing <br />SPOIL SPRING DEVELOPMENT <br />A limited number of low impact spoil springs are expected to develop occasionally, <br />but their aerial extent and low level or non-existent surface flow will have a very <br />minor impact on surface (and shallow groundwater/perched aquifer) water quality <br />and quantity in the future. In specific instances such as the Streeter Fill, pre existing <br />springs are likely the major source for the nearly continual low level discharge for the <br />Streeter Pond. However, many years of NPDES discharge monitoring at this location <br />does not support the notion that water quality is being negatively affected by water <br />that is or has managed to migrate through the reclamation areas and associated spoil. <br />Page 2-7