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2.04.7 page 2 <br />• GENERAL <br />HYDROLOGY DESCRIPTION <br />The King Coal Mine operation has little impact on groundwater systems <br />the surface hydrology is moderate. Future operations in the upper Menefee coy <br />expected to disrupt aquifers, streams, water systems, or the small watershed (up <br />the mine site). Hydrologic data obtained from the existing mine workings, core <br />mine plan area, and other research studies show that the mining operation has t <br />impact on water sources of Hay Gulch (See Appendix 4). <br />The mining bench is located in the upper reaches of the Hay Gulch drair <br />wells, diversion ditches, sedimentation ponds, water conveyances and storage, a <br />facilities are shown on Map C-4, the mine surface drainage map. <br />DRAINAGE PLAN <br />The drainage plan for the National King Coal Mine will consist of diversi <br />uncontaminated water originating upstream of the mine yard, through the yard t <br />point at the north end of site. Runoff generated on the yard itself as well as run. <br />small natural areas adjacent to the yard will be collected and routed through the <br />ponds. <br />Refer to 2.05.6 (Hydrologic Balance) and Appendix 8 for a detailed desci <br />Surface Drainage and Sediment Ponds design and descriptions. <br />• SUB-SURFACE HYDROLOGY <br />Generally, National King Coal, LLC does not encounter ground water <br />of normal mining operations for process water. National King Coal, LLC esti <br />consumptive use of 8.61 acre feet per year, for use in dust control operation. <br />continuous mining machines, each feeder breaker and belt transfer points are <br />dust. Process water is obtained by means of the two wells, one located in the <br />Floor, and the other on the mine bench, as shown on Map C-4. Occasionally, <br />water are encountered in the mine floor. These are believed to be "perched" <br />usually dry up after a short time. <br />AQUIFERS <br />The King Coal Mine is not in a major groundwater recharge area. Rese <br />portion of the basin has had very limited ground water development. Most of t <br />general area have been completed in the unconsolidated alluvial gravels and to <br />the La Plata River and its tributaries (including Hay Gulch), or in consolidated <br />south (down-dip) in the basin. Two formations, the Cliff House sandstone and <br />Formation are important and relative to the proposed mining operations. The <br />Lookout sandstone will not be affected by the mining operations. <br />• <br />nd its impact on <br />seam are not <br />lope areas of <br />rill holes in [he <br />d only a mild <br />e system. All <br />the surface. <br />~n of <br />> the discharge <br />~ff from two <br />sedimentation <br />of Mine <br />the course <br />three <br />ryed to reduce <br />Gulch Valley <br />.lined areas of <br />fifers as the <br />;h shows this <br />wells in the <br />ce deposits of <br />~uifers further <br />Menefee <br />derlvine Point <br />December 1999 <br />