2011-02-25_REPORT - C1982057 - Laserfiche WebLink

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that occurred in April 2003. A replacement well, WSC25, was drilled in September 2004. TDS values at this well display an increasing trend. All values have been below 500 mg/l. - Wolf Creek Overburden. Well WWCOV24 was drilled in August 2001 in the II-W South area. Only five samples were collected until it failed due to a landslide that occurred in April 2003. Replacement well WWCOV25 was drilled in September 2004. TDS values at this well display an increasing trend. All values have been below 1300 mg/l. - Wolf Creek Coal. Mining of the Wolf Creek coal seam began in October 2003. One well monitors the water quality in this coal seam in the II-W South area. Well WWC24 was drilled in August 2001 in the II-W South area. Only five samples were collected until this well failed due to a landslide that occurred in April 2003. A replacement well, WWC25, was drilled in September 2004. TDS values at this well display a slightly increasing trend, with the peak occurring in 2008. All values have been below 800 mg/1. 0 - Wolf Creek Underburden. Well WWCU24 was drilled in August 2001 in the II-W South area. Only five samples were collected until it failed due to a landslide that occurred in April 2003. Replacement well WWCU25 was drilled in September 2004. TDS values at this well display a decreasing trend, with the peak occurring in 2007. All values have been below 1400 mg/l. - Trout Creek Sandstone. Well WTC201 is used as the water supply well for the mine facilities. It displays an increasing TDS trend; however, the peak TDS value occurred in June 1999. It is unlikely that the TDS increases observed at this well are due to mining impacts, since confining layers of shale separated this aquifer from mined seams. All values have been at or below 700 mg/l. Comparison of Ground Water Quality to Water Use Standards. SCC has compiled a list of ground water standards for agricultural uses (Table 6