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Colowyo Coal Company <br />2010Anaual Reclamation and Hydrology Report <br />• • MT-95-02 Well - located just south of the rail loop facility and represented on <br />the Surface & Ground Water Sampling Sites Map located in Exhibit 2C. <br />Monitoring started in the first quarter of 2008 and has continued through <br />2010. <br />GENERAL TRENDS FOR SURFACE WATER <br />Colowyo currently samples each surface water site for a variety of quality parameters. <br />Of all the parameters that are analyzed for, several key indicator parameters are <br />identified. These are lab pH, lab conductivity, TDS, sulfate, calcium, iron, magnesium, <br />sodium and flow rate. Statistical analysis is completed and illustrates historical trends <br />for each parameter. See graphs for the trend lines in Exhibit 2A. <br />Surface Water Data - The Rz value for linear regression is indicated below. <br />Site Id Lab <br />pH Lab <br />Conductivity TDS Sulfate Calcium Iron Magnesium Sodium Flow rate <br />WO <br />NUGSC 0.0514 0.0005 0.0136 0.0006 0.0096 0.0044 0.0029 0.0682 0.0067 <br />LGSC 0.0704 0.0601 0.0989 0.0165 0.00005 0.0121 0.00001 0.0888 0.041 <br />UWFGSC 0.2028 0.0698 0.0959 0.1135 0.1114 0.0327 0.0639 0.0606 0.0049 <br />Ailic 0.0191 0.0972 0.0489 0.0006 0.0147 0.0001 0.0011 0.0436 0.1314 <br />W <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />NUGSC: <br />Parameter Mean dSed Range Max. Min. Max at Min at Trend <br />Lab pH 8.13 0.24 1.1 8.6 7.5 04/27/98 10/24/02 Increasing <br />Lab Cond. 1503.61 279.53 2842 3600 758 03/06/98 05/27/93 Static <br />TDS 1140.59 244.79 1250 1610 360 08/06/01 05/08/02 Increasing <br />Sulfate 509.55 145.43 760 930 170 07/08/02 05/20/97 Static <br />Calcium 126.69 19.70 165.6 169 3.4 08/02/02 06/01/93 Increasing <br />Iron 0.78 1.63 8.53 8.54 0.01 05/17/99 02/11/02 Increasing <br />Magnesium 123.15 29.76 226.9 228 1.1 08/02/02 04/27/98 Increasing <br />Sodium 47.67 16.41 121.1 138 16.9 11/10/08 04/27/98 Increasing <br />Flow rate 2.97 3.21 19.8 20 0.2 04/27/98 03/18/96 Increasing <br />• <br />Page 2-3