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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 Impoundments Map. Monitoring has occurred from <br />1984 to 2002. <br />• North Good Springs Well (NGSW) -located along Moffat County State Highway <br />13 and represented on the Impoundments Map. Monitoring has occurred from <br />1989 to 2002. <br />• Gossard Well -located within the rail loop facility. Access to this well is through <br />Colowyo and represented on the Impoundments Map. Monitoring has occurred <br />from 1983 to 2002. <br />GENERAL TRENDS <br />Colowyo currently samples each surface water site for a vaziety of quality parameters. Of <br />all the pazameters that are analyzed for, several key indicator pazameters aze identified. <br />These aze 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 />• pazameter. See graphs for the trend lines in Exhibit 2A. <br />Surface Water Data -The R2 value for lineaz regression is indicated below. <br />Site Id Lab <br />H Lab <br />Conductive TDS Sulfate Calcium Iron Magnesium Sodium Flow rate <br />cfs <br />NUGSC 0.1722 0.0204 0.0392 0.1232 0.1622 0.0139 0.1619 8E-06 0.012 <br />LGSC 0.0073 0.0749 0.1505 0.0079 0.0006 0.0055 0.0015 0.0918 0.0327 <br />LTC 0.0229 0.1237 0.0489 0.0006 0.0042 0.0001 0.0101 0.0436 0.0296 <br />Summary of the indicator pazameters 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 8.06 0.24 1 8.5 7.5 04/27/98 10/24/02 Decreasin <br />Lab Cond. 1504.67 318.54 2842 3600 758 03/06/98 05/27/93 Increasin <br />TDS 1160.60 269.24 1250 1610 360 08/06/01 05/08/02 Increasin <br />Sulfate 516.05 149.08 760 930 170 07/08/02 05/20/97 Increasin <br />Calcium 125.72 18.41 92 169 77 08/02/02 06/01/93 Increasin <br />Iron 0.75 1.60 8.53 8.54 0.01 05/17/99 02/11/02 Decreasin <br />Ma esium 123.97 31.41 172.6 228 55.4 08/02/02 04/27/98 Increasin <br />Sodium 43.42 12.68 58.1 75 16.9 08/23/94 04/27/98 Level <br />CF 4.3 2003 <br />