2011-03-24_REPORT - C1981019 (8)

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Colowyo coal company 201OAnnual Reclamation and Hydrology Report 0 LGSC: • • Parameter Mean Std dev 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. 1699.68 309.04 2659 2820 161 01/19/93 06/23/92 Increasing TDS 1338.05 341.78 3420 4050 630 11/08/00 05/23/95 Increasing Sulfate 646.50 157.49 710 945 235 12/04/89 05/20/97 Decreasing Calcium 140.26 24.94 198 208 10 12/28/89 3/13/84 Level Iron 0.66 0.93 8.81 8.84 0.03 08/13/08 02/01/88 Increasing Magnesium 144.64 29.52 225.3 226 0.7 12/04/89 05/20/97 Level Sodium 72.72 25.03 144.3 164 19.7 10/08/98 04/17/00 Increasing Flow rate 4.04 5.23 46.94 47 0.06 04/27/98 12/06/99 Decreasing UWFGSC: Parameter Mean Std dev Range Max. Min. Max at Min at Trend Lab pH 8.42 0.09 0.3 8.6 8.3 6/18/08 11/2/09 Decreasing Lab Cond. 902.58 232.36 847 1150 303 11/8/07 4/15/08 Decreasing TDS 664.62 127.52 380 800 420 11/8/07 6/03/09 Decreasing Sulfate 196.68 62.41 201 282 81 11/08/07 6/03/09 Decreasing Calcium 95:11 16.30 53 116 63 12/18/07 5/12/08 Decreasing Iron 1.39 2.36 7.82 7.90 0.08 3/17/09 8/19/09 Increasing Magnesium 74 18.40 60 95 35 11/8/07 5/12/08 Decreasing Sodium 10.31 3.61 6 12 6 2/13/08 6/18/08. Decreasing Flow rate 0.81 1.34 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 512.25 126.4 1109 1128 19 10/05/89 02/28/90 Increasing Calcium 90.86 25.92 108.2 134 25.8 02/24/86 02/05/01 Decreasing Iron 4.94 18.67 131.99 132 0.01 02/28/90 09/13/95 Increasing Magnesium 116.88 45.65 230 238 8 10/12/88 02/28/90 Increasing Sodium 92.79 36.07 168 174 6 10/05/89 02/28/90 Increasing Flow rate 0.38 0.84 6.3 6.3 0 04/29/86 12/13/02 Decreasing Page 2-4