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trend. South area Well WW25 was drilled in September 2004. TDS values at <br />this well display an increasing trend. <br />The Seneca II-W PHC predicts an annual average TDS value of 2630 mg/l <br />for Well WW14, while a value of 4950 mg/l (4610 mg/l calculated) was <br />observed this year. For Well WW17, a value of 3002 mg/l was predicted, <br />while a value of 770 mg/l 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 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 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 display a decreasing <br />trend from last years value. All 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 />7