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NCIG intends to dispose of refuse underground within the mined-out voids created in the uaheeler/Lower Wheeler Seam. The refuse will consist of non-coal material removed during the mining process, including minor amount of wall and floor rock and non-coal partings. In general, this material will consist of sandstone, siltstone, and shale. The refuse will be placed in the mine voids by slurry methods and excess water will be drained back to the active mine and recycled. Since excess water will be drained from the disposal area, the total volume of water available to directly migrate away from mine voids will be minimal. However, any remaining pore water will eventually be displaced by infiltrating groundwater. The recharge rate is not known, but given the surface geometry and low perme- ability of the rocks, the infiltration rate is probably quite low. In terms of impact to the water-bearing portion of the wheeler/LO- wer Wheeler Seam, little if any impact is expected. Groundwater in the Wheeler/Lower Wheeler Seam is not usable due to its inaccessi- • bility, poor water quality, and low permeability. As described in Section 3.0, groundwater is moving down-dip into the deeper portions of the basin and at the same time is further degrading in quality. Any incremental change in water quality due to subsurface disposal of rock material originally removed from the same voids, would be relatively insignificant to a presently unusable source of water. 9.6.3.2.2 Mine Facility The mine facility will be located predominantly on colluvial deposits from the hogback (Figure 5.2-1). The impact of these structures to the hydrologic balance of the area should be minimal during their operation and temporary with respect to the post-mine period. Refer to Section 5.2 for a more detailed discussion of the hydrologic balance of this AVF area and possible impacts to this NCIG - Coal Ridge ql 4-83 ABC/1145/910509 7 F' ~%