Laserfiche WebLink
Colowyo Coal Company <br />20~07Annual Reclamation and Hydrology Report <br />• • Lower Ta for Creek (LTC) -downstream site, located below active mining <br />Y <br />conditions along Moffat County Road 17 and represented on the Surface & <br />Ground Water Sampling Sites Map located in Exhibit 2C. Monitoring has <br />occurred from 1983 to 2007. <br />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 <br />Highway 13 and represented on the Surface & Ground Water Sampling Sites <br />Map located in Exhibit 2C. Monitoring has occurred from 1984 to 2007. <br />• North Good Springs Well (NGSW) -located along Moffat County State <br />Highway 13 and represented on the Surface & Ground Water Sampling Sites <br />Map located in Exhibit 2C. Monitoring has occurred from 1989 to 2007. <br />• Gossard Well -located within the rail loop facility. Access to this well is <br />• through Colowyo and represented on the Surface & Ground Water Sampling <br />Sites Map located in Exhibit 2C. Monitoring has occurred from 1983 to 2007. <br />GENERAL TRENDS <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 />H Lab <br />Conductivi TDS Sulfate Calcium Iron Magnesium Sodium Flow rate <br />(c~) <br />NUGSC 0.01 0.009 0.05 0.0465 0.0292 0.0022 0.0227 0.0977 0.01 <br />LGSC 0.04 0.0889 0.1335 0.003 0.0007 0.0001 0.0024 0.1209 0.048 <br />UWFGSC 0.75 0.0.6173 0 0 0.9758 0 0.6447 0 0.75 <br />LTC 0.0191 0.0972 0.0489 0.0006 0.0147 0.0001 0.0011 0.0436 0.1028 <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />Page 2-2 <br />