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Section 2.05.3(4)Page 1 April 2024 (TR-25) <br />Ponds, Impoundments, Other Treatment Facilities and Diversions <br />Introduction <br />This section contains historical information for the sediment ponds and ditches that were <br />constructed within the permit area. These structures were all reclaimed in 2023, and a small stock <br />pond (Garvey and Company Pond 1) is the only remaining structure within the permit area. This <br />stock pond will remain post mine at the request of the landowner. Please refer to Attachment <br />2.05.5-1 for documentation from the landowner regarding this permanent stock pond. Map <br />2.05.3(4)-1, Surface Water Hydrology provides historical information and Map 2.05.3(4)-6 <br />provides the as-built for the Garvey and Company Pond 1. <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 and <br />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 and <br />sediment control practices. Sediment control may include but not be limited to the following: <br />1.Disturbing the smallest practicable area at any one time during the mining and construction <br />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 material <br />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 flow <br />or to runoff outside the permit area; <br />6.Using straw dikes, silt fences, small trapezoidal or V-ditches, riprap, mulches, check dams, <br />vegetative sediment filters, temporary cover crops, sediment traps, and other measures that <br />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 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.Mechanical soil manipulation measures including contour furrowing, chisel plowing, etc. <br />2.Topographic manipulations that include re-contouring or reshaping of graded material in a <br />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,