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Wolf Creek Overburden. <br />Well WWCOV24 was drilled in August 2001 in the II -W South area. Only <br />five samples were collected until it failed due to a landslide that <br />occurred in April 2003. Replacement well WWCOV25 was drilled in <br />September 2004. TDS values at this well display an increasing trend, <br />with the high TDS value of 1730 mg/l occurring in 2017. <br />Wolf Creek Coal. <br />Mining of the Wolf Creek coal seam began in October 2003. One well <br />monitors the water quality in this coal seam in the II -W South area. <br />Well WWC24 was drilled in August 2001 in the II -W South area. Only five <br />samples were collected until this well failed due to a landslide that <br />occurred in April 2003. A replacement well, WWC25, was drilled in <br />September 2004. TDS values at this well display an increasing trend, <br />with the high TDS value of 808 mg/l occurring in 2017. <br />Wolf Creek Underburden. <br />Well WWCU24 was drilled in August 2001 in the II -W South area. Only five <br />samples were collected until it failed due to a landslide that occurred <br />in April 2003. Replacement well WWCU25 was drilled in September 2004. <br />TDS values at this well display a recently stable trend, with the peak <br />occurring in 2007. All values have been below 1400 mg/l. <br />Trout Creek Sandstone. <br />Well WTC201 is used as the water supply well for the mine facilities. It <br />displays an increasing TDS trend. The peak TDS value occurred in 1999. <br />It is unlikely that the TDS increases observed at this well are due to <br />mining impacts, since confining layers of shale separated this aquifer <br />from mined seams. WTC201 has not been sampled since 2015, however the <br />last few sampling events display unusually low TDS values. All TDS <br />values have been at or below 700 mg/l. <br />Comparison of Ground Water Quality to Water Use Standards. <br />SCC has compiled a list of ground water standards for agricultural uses <br />(Table 5). This list is composed of Colorado Department of Public Health <br />and Environment ground water standards (CDPHE, Reg. 41, May 2004). <br />7 <br />