Laserfiche WebLink
Ground Water Data -Ground water monitoring sites comprise one up dip and rivo <br />down dip shallow a]luvial wells and are briefly described below (See Iixhibit 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 2004. <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 2004. <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 2004. <br />GENERAL TRENDS <br />Colowyo currently samples each surface water site for a variety of quality parameters. Of <br />all the pazameters that are analyzed For, several key indicator parameters are identified. <br />These are lab pH, lab conductivity, TDS, sulfate, calcium, iron, magnesiurn, 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 Rz 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 0.1102 0.0319 0.1044 0.1601 0.2513 0.00004 0.1933 0.0764 0.0694 <br />LGSC 0.0047 0.1045 0.1855 0.0003 0.0117 0.0003 0.0235 0.1555 0.0355 <br />LTC 0.0191 0.0972 0.0489 0.0006 0.0147 0.0001 0.0011 0.0436 0.0652 <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />• NUGSC: <br />Parameter Mean dev Range Max. Min. Max at Min at Trend <br />Lab H 8.05 0.23 1 8.5 7.5 04/27/98 10/24/02 Decreasing <br />Lab Cond. 1512.24 309.78 2842 3600 758 03/06/98 05/27/93 Increasin <br />TDS 1129.87 268.69 1250 1610 360 08/06/01 05/08/02 Increasin <br />Sulfate 520.59 150.08 760 930 170 07/08/02 05/20/97 Increasin <br />Calcium 127.94 18.91 92 169 77 08/02/02 06/01/93 Increasin <br />Iron 0.83 1.80 8.53 8.54 0.01 05/17/99 02/11/02 Level <br />Ma esium 126.06 30.97 172.6 228 55.4 08/02/02 04/27/98 Increasing <br />Sodium 44.49 13.26 58.1 75 16.9 08/23/94 04/27/98 Increasin <br />cF ~zia zooa <br />