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• TAB 13 <br />FACILITIES <br />This chapter contains a description of the existing structures used in connection with the reclamation <br />activities at the Nucla Mine area. <br />Construction of the original facilities at the Nucla Mine began prior to Peabody's acquisition of the <br />mine in 1963. The old office-shop area was removed in 1986-1987 when the mine was reopened <br />and Area No. 4 mined. The Nucla Mine facilities were constructed or modified in 1987 to support <br />the mining operations and comply with the applicable rules and regulations. The following describes <br />the existing structures at the Nucla area. <br />Peabody utilized various types of structures to control the runoff from disturbed areas within the <br />permit boundaries at the Nucla Mine. In addition, surface mining activities were conducted to <br />minimize disturbance of the prevailing hydrologic balance in both the mine plan and adjacent areas <br />• in order to prevent long-term adverse changes in the hydrologic balance. <br />Sediment control measures included proper utilization of reclamation methods and sediment control <br />practices singly or in combination. Sediment control methods included the following: <br />1. Stabilizing graded material to promote a reduction in the rate and volume of runoff; <br />2. Retaining sediment within disturbed areas; <br />3. Diverting runoff away from disturbed areas including stockpiles and backslopes; <br />4. 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 streamflow <br />or to runoff outside the permit area; <br />5. Using straw dikes, silt fences, small V-ditches, riprap, mulches, check dams, vegetative <br />sediment filters, temporary cover crops, sediment traps, and other measures that reduce <br />overland flow velocity, reduce runoff volume, or trap sediment. <br />C <br />13-1 <br />