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Colowyo Coal Company <br />2008 Annual Reclamation and Hydrology Report <br />0 Gossard Well: <br />Parameter Mean Sea Range Max. Min. Max at Min at Trend <br />Lab pH 7.89 .28 1.6 8.6 7 10/08/98 10/21/02 Decreasing <br />Lab Cond. 1904.72 227.199 990 2350 1360 10/08/98 03/29/85 Increasing <br />TDS 1368.92 221.11 848 1810 962 10/08/98 03/13/93 Increasing <br />Sulfate 523.39 129.76 474 838 364 10/08/98 03/29/85 Increasing <br />Calcium 107.41 24.14 169 181 12 10/08/98 11/30/93 Increasing <br />Iron 1.10 3.60 28.99 29 0.01 10/08/98 10/21/02 Decreasing <br />Magnesium 129.59 26.66 202 217 15 10/08/98 11/30/93 Increasing <br />Sodium 162.38 27.54 221 240 19 10/08/98 11/30/93 Increasing <br />Elevation 11 6329.20 2.95 14 6339.09 6325.09 10/03/00 03/28/91 Increasing <br />MT-95-02 Well: <br />• <br />U <br />Parameter Mean dSed Range Max. Min. Max at Min at Trend <br />Lab pH 7.68 0.2217 0.5 7.9 7.4 3/11/08 11/10/08 Decreasing <br />Lab Cond. 2762.50 69.4622 150 2810 2660 11/10/08 6/18/08 Increasing <br />TDS 2252.50 58.5235 120 2300 2180 8/13/08 3/11/08 Increasing <br />Sulfate 925.25 63.5315 137 968 831 6/18/08 11/10/08 Decreasing <br />Calcium 217.25 11.3248 24 225 201 3/11/08 6/18/08 Increasing <br />Iron 0.05 0.005 0.01 0.06 0.05 11/10/08 3/11/08 Increasing <br />Magnesium 204 8.2057 20 214 194 11/10/08 8/13/08 Increasing <br />Sodium 135.75 28.1943 61 155 94 11/10/08 8/13/08 Decreasing <br />Elevation 6435.48 1.2008 2.47 6437.28 6434.81 3/11/08 8/13/08 Decreasing <br />Page 2-7