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Ponds, Impoundments, Other Treatment Facilities and Diversions <br />Introduction <br />This section contains general plans and detailed plans for sediment ponds and ditches to be <br />constructed within the permit area. Map 2.05.3(4)-1, Surface Water Hydrology delineates the <br />locations of the sediment ponds and ditches. <br />Sediment and Water Control Facilities Plan <br />NHN will use various types of structures to control the runoff from disturbed areas within the <br />permit boundaries at the NHN Mine. In addition, surface mining activities will be planned and <br />conducted to minimize disturbance of the prevailing hydrologic balance in both the mine plan <br />and adjacent areas in order to prevent long-term adverse changes in the hydrologic balance. <br />Sediment control measures will include proper utilization of mining and reclamation methods <br />and sediment control practices singly or in combination. Sediment control methods may include, <br />but not be limited to the following: <br />1. Disturbing the smallest practicable area at any one time during the mining and <br />construction operation; <br />2. Stabilizing graded material to promote a reduction in the rate and volume of runoff; <br />3. Retaining sediment within disturbed areas; <br />4. Diverting runoff away from disturbed areas including stockpiles, back slopes, and <br />material storage; <br />5. Diverting runoff through disturbed areas using stabilized earth channels, culverts or pipes <br />so as to prevent, to the extent possible, additional contributions of sediment to stream <br />flow or to runoff outside the permit area; <br />6. Using straw dikes, silt fences, small trapezoidal or V -ditches, riprap, mulches, check <br />dams, vegetative sediment filters, temporary cover crops, sediment traps, and other <br />measures that will reduce overland flow velocity, reduce runoff volume, or trap sediment; <br />7. Treating traffic areas with water or dust suppressant to reduce the potential for wind and <br />water erosion. <br />In addition, NHN may utilize appropriate sediment control measures representing the best <br />technology currently available which may include, but not be limited to the following: <br />1. Soil surface mechanical manipulation measures that include contour furrowing, chisel <br />plowing, etc. <br />2. Topographic manipulations that include re -contouring or reshaping of graded material in <br />a manner that minimizes the potential for soil erosion; <br />3. Surface protection measures that include surface stabilizers such as temporary cover crop <br />with permanent vegetation covers occurring as timely as practical, <br />Section 2.05.3(4) Page 1 March 2018 (TR -16) <br />