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The conclusion regarding [he potential impacts of the TCC longwall operation in the Eastern Mining District on <br />the local surface and ground water resources is that the effects will be very limited due to the depth and <br />lithological composition of the overburden above the mined Wadge Coal Seam. Impacts on surface and ground <br />water resources are possible within 340 to 380 feet above the mined coal seam and within an angle of draw of <br />about 17 degrees from the longwall panels. An analysis of the geologic composition of the Wadge Coal Seam <br />Overburden indicated that only limited sandstone strata in the mined coal seam overburden are impacted by <br />subsidence. The conclusion is confirmed by the limited ground water inflow into the current mining operation. <br />The predicted ground surface subsidence within the Foidel Creek alluvium would reach up to 86 inches during <br />mining in panel 6 Right, where the overburden is 600 feet thick (SubTerra, Inc., 1996). This rate of subsidence <br />could cause short-term changes in the Foidel Creek stream gradient. However, the calculated maximum slope <br />change (SubTerra, Inc., 1996) of 13.9 x 10-3 (panel 6 Right) would not have any significant long-term impact on <br />the stream flow and/or water quality. The meandering character of Foidel Creek, cutting through fine-grained <br />sediments, would facilitate the fast-healing process of any temporary changes in the streambed gradient. <br />• <br />• <br />APPR®W~~ FEB 0 ~ 2000 <br />TR 99-32 2.05-166 11/15/99 <br />