2009-03-27_REPORT - C1981019 (8)

Home Browse Search

Colowyo Coal Company 2008 Annual Reclamation and Hydrology Report 49 A-7 Well: Parameter Mean Std dev Range Max. Min. Max at Min at Trend Lab pH 7.80 .2000 0.4 8 7.6 8/13/08 11/10/08 Decreasing Lab Cond. 1776.67 418.8476 740 2260 1520 6/18/08 8/13/08 Decreasing TDS 1476.67 540.0309 950 2100 1150 6/18/08 11/10/08 Decreasing Sulfate 650 399.0351 713 1110 397 6/18/08 11/10/08 Decreasing Calcium 145 35.5949 64 186 122 6/18/08 8/13/08 Decreasing Iron 0.37 0.4617 1.81 1.82 0.01 09/26/98 11/18/97 Increasing Magnesium 161.33 71.5984 125 244 119 6/18/08 8/13/08 Decreasing Sodium 55.33 19.0875 36 77 41 6/18/08 8/13/08 Decreasing Elevation 6891.55 3.7595 6.85 6895.87 6889.02 6/18/2008 11/10/2008 Decreasing A-8 Well: • Parameter Mean dSted Range Max. Min. Max at Min at Trend Lab pH 7.87 0.2309 0.4 8 7.6 6/18/08 11/10/08 Decreasing Lab Cond. 1043.33 23.0940 40 1070 1030 11/10/08 6/18/08 Increasing TDS 736.67 11.5470 20 750 730 11/10/08 6/18/08 Increasing Sulfate 204.67 14.2244 26 221 195 8/13/08 6/18/08 Increasing Calcium 97.33 7.5056 15 105 90 11/10/08 6/18/08 Increasing Iron 0.15 0.1790 0.31 0.36 0.05 11/10/08 6/18/08 Increasing Magnesium 81.33 2.0817 4 83 79 11/10/08 8/13/08 Increasing Sodium 14.00 43.589 8 19 11 6/18/08 11/10/08 Decreasing Elevation 7110.85 6.7300 13.31 7116.93 7103.62 6/18/2008 11/10/2008 Decreasing NGSW: • Parameter Mean dSted Range Max. Min. Max at Min at Trend Lab pH 7.73 .30 1.7 8.5 6.8 8/19/91 10/03/00 Increasing Lab Cond. 1966.51 285.48 1550 2700 1150 10/17/91 04/27/98 Increasing TDS 1586.59 263.35 1320 2100 780 8/13/08 04/27/98 Increasing Sulfate 758.55 158.50 898 1185 287 08/19/91 04/27/98 Decreasing Calcium 165.24 31.74 169.30 262 92.7 09/27/90 10/08/98 Increasing Iron 0.40 0.63 3.98 3.99 0.01 4/27/98 10/21/02 Decreasing Magnesium 164.66 32.30 194 270 76 09/27/90 04/27/98 Increasing Sodium 89.51 22.13 154.3 186 31.7 05/18/06 04/27/98 Increasing Elevation 6534.90 1.93 10.85 6540.65 6529.8 03/13/93 08/31/04 Decreasing Page 2-6