2009-03-27_REPORT - C1981019 (8)

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Colowyo Coal Company 2008 Annual Reclamation and Hydrology Report 40 LGSC: • 19 Parameter Mean Sdted Range Max. Min. Max at Min at Trend Lab pH 8.04 0.24 2.5 8.5 6.1 08/19/91 05/14/91 Level Lab Cond. 1701.77 311.81 2659 2820 161 01/19/93 06/23/92 Increasing TDS 1338.15 349.51 3420 4050 630 11/08/00 05/23/95 Increasing Sulfate 650.74 160.16 710 945 235 12/04/89 05/20/97 Decreasing Calcium 140.39 25.37 198 208 10 12/28/89 3/13/84 Level Iron 0.66 0.95 8.81 8.84 0.03 08/13/08 02/01/88 Increasing Magnesium 144.90 29.82 225.3 226 0.7 12/04/89 05/20/97 Level Sodium 72.41 25.50 144.3 164 19.7 10/08/98 04/17/00 Increasing Flow rate 4.029 5.28 46.94 47 0.06 04/27/98 12/06/99 Decreasing UWFGSC: Parameter Mean Sdted Range Max. Min. Max at Min at Trend Lab pH 8.45 0.09 0.3 8.6 8.3 6/18/08 4/15/08 Decreasing Lab Cond. 927.82 274.85 847 1150 303 01/19/93 4/15/08 Decreasing TDS 710 112.25 280 800 520 11/8/07 6/18/08 Decreasing Sulfate 215.20 5.84 161 282 121 11/08/07 6/18/08 Decreasing Calcium 97.91 16.24 53 116 63 12/8/07 5/12/08 Decreasing Iron 0.20 0.11 0.25 0.36 0.11 6/18/08 8/13/08 Increasing Magnesium 76 18.43 60 95 35 11/8/07 5/12/08 Decreasing Sodium 9.20 2.17 6 12 6 2/13/08 6/18/08 Decreasing Flow rate 0.93 1.71 5.79 5.86 0.07 5/12/08 1/15/08 Increasing LTC: Parameter Mean Sdted Range Max. Min. Max at Min at Trend Lab pH 8.09 0.27 1.6 8.6 7 02/25/91 02/22/89 Increasing Lab Cond. 1592.35 438.92 3370 3570 200 03/06/98 02/28/90 Increasing TDS 1127.76 355.76 1786 1930 144 10/05/89 02/28/90 Increasing Sulfate 322.65 211.36 1109 1128 19 10/05/89 02/28/90 Increasing Calcium 47.16 25.92 108.2 134 25.8 02/24/86 02/05/01 Decreasing Iron 2.56 18.67 131.99 132 0.01 02/28/90 09/13/95 Increasing Magnesium 58.09 45.65 230 238 8 10/12/88 02/28/90 Increasing Sodium 46.42 36.07 168 174 6 10/05/89 02/28/90 Increasing Flow rate 0.62 0.87 6.3 6.3 0 04/29/86 12/13/02 Decreasing Page 2-4