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- Wadge Coal. Three wells monitor the Wadge coal seam. North area Well <br />WW14 exhibits an increasing TDS trend. Middle area Well WW17 exhibits a <br />nearly level TDS trend. South area Well WW25 was drilled in September <br />2004. TDS values at this well display an increasing trend. <br />- Sage Creek Overburden. This unit exits between the Wadge and Wolf <br />Creek coal seam. Mining of the Sage Creek coal seam began in September <br />2003. Well WSOV24 was drilled in August 2001 in the II -W South area. <br />Only five samples were collected until this well failed due to a <br />landslide that occurred in April 2003. A replacement well, WSOV25, was <br />drilled in September 2004. TDS values at this well displayed a stable <br />trend; however, an elevated spike (1180 mg /1) occurred this year. All <br />previous values have been below 800 mg /l. <br />- Sage Creek Coal. Mining of the Sage Creek coal seam began in <br />September 2003. Well WSC24 was drilled in August 2001 in the II -W South <br />area. Only five samples were collected until this well failed due to a <br />landslide that occurred in April 2003. A replacement well, WSC25, was <br />drilled in September 2004. TDS values at this well display an increasing <br />trend. All values have been below 500 mg /l. <br />- Wolf Creek Overburden. Well WWCOV24 was drilled in August 2001 in <br />the II -W South area. Only five samples were collected until it failed <br />due to a landslide that occurred in April 2003. Replacement well WWCOV25 <br />was drilled in September 2004. TDS values at this well display an <br />increasing trend. All values have been below 1300 mg /l. <br />- Wolf Creek Coal. Mining of the Wolf Creek coal seam began in October <br />2003. One well monitors the water quality in this coal seam in the II -W <br />South area. Well WWC24 was drilled in August 2001 in the II -W South <br />area. Only five samples were collected until this well failed due to a <br />landslide that occurred in April 2003. A replacement well, WWC25, was <br />drilled in September 2004. TDS values at this well display a slightly <br />increasing trend, with the peak occurring in 2008. All values have been <br />below 800 mg /l. <br />5 <br />