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several assumptions. 1) Baseline water quality values were an average of <br />all Wadge coal wells at Seneca II-W. 2) Aquifer characteristics were an <br />average of all Wadge coal wells at Seneca II-W. 3) The Wadge coal seam <br />was saturated for its entire thickness (11.8 feet). <br />These assumptions, however, do not hold true for Well WW14. Prior to <br />mining in the north area (November 1992), this well was almost always <br />dry (see the 1993 AHR for a complete listing of earlier water level <br />data). Since this particular portion of the Wadge seam was dry prior to <br />mining, spoils water will now contribute 100% of the water present. TDS <br />values at this well display a stable 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. This well failed due to a landslide <br />that occurred in April 2003. A replacement well, WSOV24, was drilled in <br />September 2004. TDS values at this well display a decreasing trend. <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. 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 a slightly <br />increasing trend. <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. 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. <br />- Wolf Creek Overburden/Underburden. Wells WWCOV24 (overburden) and <br />WWCU24 (underburden) were drilled in. August 2001 in the II-W South area. <br />• <br />1 <br />~~ <br />L <br />8 <br />