2010-03-12_REPORT - C1981019 (7)

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Colowyo Coal Company 2009 Annual Reclamation and Hydrology Report 0 LGSC: • C, Parameter Mean Sted Range Max Min. Max at Min at Trend Lab pH 8.04 0.24 2.5 8.6 6.1 08/19/91 05/14/91 Increasing Lab Cond. 1701.52 309.95 2659 2820 161 01/19/93 06/23/92 Increasing TDS 1337.79 344.90 3420 4050 630 11/08/00 05/23/95 Increasing Sulfate 648.69 158.41 710 945 235 12/04/89 05/20/97 Decreasing Calcium 140.37 25.37 198 208 10 12/28/89 3/13/84 Level Iron 0.66 0.94 8.81 8.84 0.03 08/13/08 02/01/88 Increasing Magnesium 144.85 29.62 225.3 226 0.7 12/04/89 05/20/97 Level Sodium 72.60 25.21 144.3 164 19.7 10/08/98 04/17/00 Increasing Flow rate 4.07 5.25 46.94 47 0.06 04/27/98 12/06/99 Decreasing UWFGSC: Parameter Mean dSted Range Max. Min. Max at Min at Trend Lab pH 8.43 0.09 0.3 8.6 8.3 6/18/08 11/2/09 Decreasing Lab Cond. 916.33 245.26 847 1150 303 11/8/07 4/15/08 Decreasing TDS 670 124.80 380 800 420 11/8/07 6/03/09 Decreasing Sulfate 202.78 64.89 201 282 81 11/08/07 6/03/09 Decreasing Calcium 96.40 15.83 53 116 63 12/18/07 5/12/08 Decreasing Iron 1.25 2.58 7.82 7.90 0.08 3/17/09 8/19/09 Increasing Magnesium 74.60 18.44 60 95 35 11/8/07 5/12/08 Decreasing Sodium 9.22 1.79 6 12 6 2/13/08 6/18/08 Decreasing Flow rate 0.83 1.46 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