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• Ground Water Data -Ground water monitoring sites comprise one up dip and two <br />down dip shallow alluvial wells and are briefly described below (See Exhibit 2C for <br />location): <br />• A-6 Well (A-6) -located south of the mine along Moffat County State Highway <br />13 and represented on the Surface & Ground Water Sampling Sites Map located <br />in Exhibit 2C. Monitoring has occurred from 1984 to 2005. <br />• North Good Springs Well (NGSW) -located along Moffat County State Highway <br />13 and represented on the Surface & Ground Water Sampling Sites Map located <br />in Exhibit 2C. Monitoring has occurred from 1989 to 2005. <br />Gossard Well -located within the rail loop facility. Access to this well is through <br />Colowyo and represented on the Surface & Ground Water Sampling Sites Map <br />located in Exhibit 2C. Monitoring has occurred from 1983 to 2005. <br />GENERAL TRENDS <br />Colowyo currently samples each surface water site for a variety of quality parameters. Of <br />all the parameters that are analyzed for, several key indicator parameters are identified. <br />These are lab pH, lab conductivity, TDS, sulfate, calcium, iron, magnesium, sodium and <br />• flow rate. Statistical analysis is completed and illustrates historical trends for each <br />parameter. See graphs for the trend lines in Exhibit 2A. <br />Surface Water Data -The R2 value for linear regression is indicated below. <br />Site Id Lab <br />H Lab <br />Conductivi TDS Sulfate Calcium Iron Magnesium Sodium Flow rate <br />(cfs <br />NUGSC 0.0297 0.0195 0.1024 0.132 0.0768 0.0006 0.0812 0.1029 0.0618 <br />LGSC 0.002 0.0922 0.1573 0.00005 0.0017 0.0007 0.0071 0.1277 0.0372 <br />LTC 0.0191 0.0972 0.0489 0.0006 0.0147 0.0001 0.0011 0.0436 0.0857 <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />• NUGSC: <br /> <br />Parameter Mean dev Range Max. Min. Max at Min at Trend <br />Lab H 8.07 0.23 1 8.5 7.5 04/27/98 10/24/02 Decreasing <br />Lab Cond. 1516.92 293.21 2842 3600 758 03/06/98 05/27/93 Increasin <br />TDS 1154.25 263.72 1250 1610 360 08/06/01 05/08/02 Increasing <br />Sulfate 528.48 147.54 760 930 170 07/08/02 05/20/97 Increasing <br />Calcium 128.18 21.38 165.6 169 3.4 08/02/02 06/01/93 Increasing <br />Iron 0.84 1.79 8.53 8.54 0.01 05/17/99 02/11/02 Level <br />Ma esium 126.57 31.51 226.9 228 1.1 08/02/02 04/27/98 Increasin <br />Sodium 46.31 13.63 58.1 75 16.9 08/23/94 04/27/98 Increasing <br />CF 17.]4 2005 <br />