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• - Wadge Coal. Three wells monitor the Wadge coal seam. Well WW14 <br />exhibits an increasing TDS trend, however, TD5 values peaked in 2001. <br />Well WW16 has not have enough water in it to sample since May 1999. In <br />past years it displayed an increasing TDS trend. Well WW17 exhibits a <br />nearly level TDS trend. Well WW4 exists in the II-W South Expansion <br />area. Monitoring at this well was resumed in July 1997 after being <br />discontinued in June 1985. This well was dry since May 2002. Due to <br />safety concerns because of its proximity to the highwall, WW4 was <br />abandoned in August 2003. A replacement Wadge coal well was drilled in <br />September 2004. <br />The Seneca II-W PHC predicts an annual average TDS value of 2630 mg/1 <br />for Well WW14, while a value of 4550 mg/1 (4430 mg/1 calculated) was <br />observed this year. For Well WW17, a value of 3002 mg/1 was predicted, <br />while a value of 655 mg/1 was observed this year. <br />As noted in the previous paragraph, Well WW14 experienced this year a <br />TDS exceedence of the PHC prediction. This prediction was based on <br />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 We11 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. <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 was drilled in September <br />2004. <br />9 <br />