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Colowyo Coal Company <br />2007Aanual Reclamation and Hydrology Report <br />• <br />NUGSC: <br />Parameter Mean de Range Max. Min. Max at Min at Trend <br />Lab pH 8.11 779.91 1.1 8.6 7.5 04/27/98 10/24/02 Increasing <br />Lab Cond. 1514.34 317.61 2842 3600 758 03/06/98 05/27/93 Increasing <br />TDS 1149.59 511.74 1250 1610 360 08/06/01 05/08/02 Increasing <br />Sulfate 522.24 226.37 760 930 170 07/08/02 05/20/97 Increasing <br />Calcium 127.36 60.54 165.6 169 3.4 08/02/02 06/01/93 Increasing <br />Iron 0.81 65 8.53 8.54 0.01 05/17/99 02/11/02 Decreasing <br />Magnesium 124.77 65.57 226.9 228 1.1 08/02/02 04/27/98 Increasing <br />Sodium 46.84 25.32 58.1 75 16.9 08/23/94 04/27/98 Increasing <br />Flow rate 2.97 3.55 19.8 20 0.2 04/27/98 03/18/96 Increasing <br />LGSC: <br />• <br />C <br />Parameter Mean de Range Max. Min. Max at Min at Trend <br />Lab pH 8.01 0.23 2.4 8.5 6.1 08/19/91 05/14/91 Increasin <br />Lab Cond. 1703.38 317.35 2659 2820 161 01/19/93 06/23/92 Increasing <br />TDS 1339.89 358.16 3420 4050 630 11/08/00 05/23/95 Increasing <br />Sulfate 654.681 160.75 710 945 235 12/04/89 05/20/97 Decreasing <br />Calcium 140.82 25.63 198 208 10 12/28/89 3/13/84 Level <br />Iron 0.60 0.63 4.24 4.27 0.03 04/27/98 02/01/88 Level <br />Magnesium 145.92 29.73 225.3 226 0.7 12/04/89 05/20/97 Increasing <br />Sodium 72.65 25.76 144.3 164 19.7 10/08/98 04/17/00 Increasing <br />Flow rate 4.14 5.32 46.94 47 0.06 04/27/98 12/06/99 Decreasing <br />UWFGSC: <br />Parameter Mean de Range Max. Min. Max at Min at Trend <br />Lab pH 8.47 0.06 0.1 8.5 8.4 08/19/91 05/14/91 Decreasing <br />Lab Cond. 1100.00 70.00 130 1150 1020 01/19/93 06/23/92 Increasing <br />TDS 800.00 0 0 800 800 11/08/00 05/23/95 Level <br />Sulfate 282.00 0 0 282 282 12/04/89 05/20/97 Level <br />Calcium 106.00 11.14 22 116 94 12/28/89 3/13/84 Increasing <br />Iron 0.15 0 0 0.15 0.15 04/27/98 02/01/88 Level <br />Magnesium 89.00 8.72 16 95 79 12/04/89 05/20/97 Increasing <br />Sodium 10.00 0 0 10 10 10/08/98 04/17/00 Level <br />Flow rate 0.08 0.01 0.02 0.09 0.07 04/27/98 12/06/99 Decreasing <br />Page 2-3 <br />