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I~ The Seneca ZI-W PHC predicts an annual average TDS value of 2630 mg/1 for Well WW14, while a value of 4575 mg/1 (4385 mg/1 calculated) was observed this year. For Well WW17, a value of 3002 mg/1 was predicted, while a value of 685 mg/1 was observed this year. As noted in the previous paragraph, Well WW14 experienced this year a TDS exceedence of the PHC prediction. This prediction was based on several assumptions. 1) Baseline water quality values were an average of all Wadge coal wells at Seneca II-W. 2) Aquifer characteristics were an average of all Wadge coal wells at Seneca II-W. 3) The Wadge coal seam was saturated for its entire thickness (11.8 feet). These assumptions, however, do not hold true for Well WW14. Prior to mining in the north area (November 1992), this well was almost always dry (see the 1993 AHR for a complete listing of earlier water level data). Since this particular portion of the Wadge seam was dry prior to mining, spoils water will now contribute 100$ of the water present. - Sage Creek Overburden. This unit exits between the Wadge and Wolf Creek coal seam. Mining of the Sage Creek coal seam began in September 2003. Well WSOV24 was drilled in August 2001 in the II-W South area. Only five samples were collected. This well failed due to a landslide that occurred in April 2003. A replacement well, WSOV24, was drilled in September 2004. - Sage Creek Coal. Mining of the Sage Creek coal seam began in September 2003. Well WSC24 was drilled in August 2001 in the II-W South area. Only five samples were collected. This well failed due to a landslide that occurred in April 2003. A replacement well, WSC25, was drilled in September 2004. - Wolf Creek Coal. Mining of the Wolf Creek coal seam began in October 2003. Two wells monitored the water quality in this coal seam. Both . existed in the II-W South area. Monitoring at Well WWC4 was resumed in July 1997 after being discontinued in June 1985. A casing obstruction in 9