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Colowyo Coal Company <br />2009 Annual Reclamation and Hydrology Report <br />• <br />Gossard Well: <br />Parameter Mean Sea Range Max. Min. Max at Min at Trend <br />Lab pH 7.90 0.28 1.6 8.6 7 10/08/98 10/21/02 Decreasing <br />Lab Cond. 1913.21 226.91 990 2350 1360 10/08/98 03/29/85 Increasing <br />TDS 1380.39 223.41 848 1810 962 10/08/98 03/13/93 Increasing <br />Sulfate 525.38 137.75 719 838 119 10/08/98 8/19/09 Increasing <br />Calcium 107.99 23.81 169 181 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 130.31 26.36 202 217 15 10/08/98 11/30/93 Increasing <br />Sodium 163.19 27.25 221 240 19 10/08/98 11/30/93 Increasing <br />Elevation 6329.28 2.93 14 6339.09 6325.09 10/03/00 03/28/91 Increasing <br />MT-95-02 Well: <br />• <br /> <br />Parameter Mean dea Range Max. Min. Max at Min at Trend <br />Lab pH 7.74 0.18 0.6 8.0 7.4 8/19/09 11/10/08 Increasing <br />Lab Cond. 2752.50 73.63 210 2860 2650 6/03/09 11/02/09 Decreasing <br />TDS 2235 91.96 290 2330 2040 3/17/09 11/02/09 Decreasing <br />Sulfate 931.13 49.10 137 968 831 8/19/09 11/10/08 Increasing <br />Calcium 218.63 10.32 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 205.88 9.43 27 219 192 3/17/09 11/2/09 Increasing <br />Sodium 146.75 22.03 69 163 94 6/03/09 8/13/08 Increasing <br />Elevation 6435.54 1.23 3.08 6437.76 6434.68 11/2/09 8/19/09 Increasing <br />Page 2-7