2020-07-13_REVISION - C1981008 (2)

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Mine Facilities A. Introduction This section contains a description of the structures to be used in connection with or to facilitate the surface coal mining and reclamation activities at the New Horizon Mine area described in Section 2.05.3. B. Sediment and Water Control Facilities Plan New Horizon Mine will use various types of structures to control the runoff from disturbed areas within the permit boundaries. In addition, surface mining activities will be planned and conducted to minimize disturbance of the prevailing hydrologic balance in both the mine plan and adjacent areas in order to prevent long-term adverse changes in the hydrologic balance. Sediment control measures will include proper utilization of mining and reclamation methods and sediment control practices individually or in combination. Typically, this will include disturbing the smallest practicable area at any one time during ground disturbing activities. If rills and/or gullies of limited areal extent form which disrupts the approved post mining land use or the reestablishment of the vegetative cover they will be mitigated as soon as practical. Repairs will also be performed in accordance with Rule 4.15.7(5)(a), which means they will be limited to no more than five percent of the acreage initially revegetated during any one year. If a rill or gully feature is identified,New Horizon will utilize appropriate manpower and equipment depending on the ground conditions and the extent of the erosion. This shall include but is not limited to small track dozers, blades, and rubber tired farm tractors. Equipment will be utilized to repair the areas with a minimal footprint as possible. Occurrence of excessive rills and gullies will result in implementation of the following plan. One of, or a combination of, the following options and corrective methods will be employed: If it is determined that the topography of the regraded area is such that drainage is concentrated in a particular area, then this area will be improved to accept the runoff. In areas where no natural armoring is present, the drainage bottom or channel will be reshaped, if needed. The channel bottom will be seeded, covered with erosion matting and seeded, or rocked. The method used will, of course,depend on site conditions. Continued observations will be made of this area for problems or necessary maintenance. On slopes where no Swale or defined channel exists, regrading, or disking, or chisel plowing will be performed, depending on the extent of the erosion. Reseeding will then take place. In addition to the above, contour furrows in and above the erosion area may be constructed to trap and slow down the runoff. Straw dikes can also be used where appropriate to control runoff and promote revegetation. If corrective measures described above fail, New Horizon proposes to observe and reevaluate the situation. A combination of the first two methods described or some variation therein will be Section 2.05.3(3) Page 3 July 2020 (TR-99)