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values in 2008, 2009 and 2011. South area Well WOV25 was drilled in <br />September 2004. It displays a recently stable TDS trend. <br />- Wadge Coal. Three wells monitor the Wadge coal seam. North area Well <br />WW14 exhibits a slightly increasing TDS trend. Middle area Well WW17 <br />exhibits a nearly level TDS trend. South area Well WW25 was drilled in <br />September 2004. TDS values at this well recently display a stable trend. <br />- Sage Creek Tributary Alluvium. One well monitors the Sage Creek <br />Tributary Alluvium. Well WSAL14 displays a decreasing TDS trend. All <br />values have been at or below 550 mg/l. <br />- Sage Creek Overburden. This unit exits between the Wadge and Wolf <br />Creek coal seams. 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 in 2011. All <br />previous values have been below 800 mg/l; this year's value was 649 <br />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 700 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. With the high TDS value of 1550 mg/l occurring in <br />September of 2015. <br />11 <br />