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Colowyo Coal Company <br />201~7Annual Reclamation and Hydrology Report <br />• <br />Iron 0.37 0.4617 1.81 1.82 0.01 09/26/98 11/18/97 Decreasing <br />Magnesium 56.28 17.5330 127 169 42 11/18/97 08/19/82 Decreasing <br />Sodium 119.78 18.9617 122.1 140 17.9 10/13/99 04/27/98 Increasing <br />Elevation 6897.70 3724.3273 14.53 6902.53 6888 05/01/85 07/31/00 Increasing <br />NGSW: <br />Parameter Mean den Range Max. Min. Max at Min at Trend <br />Lab pH 7.73 0.31 1.7 8.5 6.8 08/19/91 10/03/00 Increasin <br />Lab Cond. 1947.27 279.94 1550 2700 1150 10/17/91 04/27/98 Increasing <br />TDS 1565.86 253.14 1180 1960 780 11/15/06 04/27/98 Increasing <br />Sulfate 751.08 158.88 898 1185 287 08/19/91 04/27/98 Decreasing <br />Calcium 163.81 31.91 169.30 262 92.7 09/27/90 10/08/98 Decreasing <br />Iron 0.41 0.65 3.98 3.99 0.01 4/27/98 10/21/02 Decreasing <br />Magnesium 163.27 32.55 194 270 76 09/27/90 04/27/98 Level <br />Sodium 88.42 22.16 154.3 186 31.7 05/18/06 04/27/98 Increasing <br />Elevation 6534.96 1.92 10.85 6540.65 6529.8 03/13/93 08/31/04 Decreasing <br />Gossard Well: <br />• <br />• <br />Parameter Mean den Range Max. Min. Max at Min at Trend <br />Lab pH 7.89 0.28 1.6 8.6 7 10/08/98 10/21/02 Decreasing <br />Lab Cond. 1895.64 227.29 990 2350 1360 10/08/98 03/29/85 Increasing <br />TDS 1358.36 218.73 848 1810 962 10/08/98 03/13/93 Increasing <br />Sulfate 518.50 129.55 474 838 364 10/08/98 03/29/85 Increasing <br />Calcium 107.03 24.54 169 181 12 10/08/98 11/30/93 Increasing <br />Iron 1.15 3.67 28.99 29 0.01 10/08/98 10/21/02 Decreasing <br />Ma nesium 129.24 27.11 202 217 15 10/08/98 11/30/93 Increasing <br />Sodium 162.04 27.97 221 240 19 10/08/98 11/30/93 Increasing <br />Elevation 6329.08 2.94 14 6339.09 6325.09 10/03/00 03/28/91 Increasing <br />Page 2-5 <br />