2012-01-06_PERMIT FILE - C1982057A (6)

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Introduction This chapter contains a description of the various structures to be used in connection with or to facilitate the surface coal mining and reclamation activities at the Seneca II-W Mine area described in the Coal Resource Recovery, Tab 12. It is important to remember that the Seneca II-W Mine is an existing mine which requires various support facilities (see Exhibits 12-2, Operations Ptan and 13-1, Facilities .Map}. The existing facilities have been previously approvetl by CDMG in issuing permits for mining in the Seneca II-W Mine area. Construction of the original facilities at the Seneca II-W Mine began prior to Peabody Coal Company's, the corporate processor to Seneca Coa! Company (SCC), start-up of the mine in 1990. The existing facilities were constructed or modified in 1990 to support the mining operations and comply with the applicable rules and regulations. Facilities in the upper block were constructed by July 1992. Facilities in the II-W South area were constructed as mining progressed into the South Area beginning in 1998. The following describes the mine support facilities and structures at the Seneca !I-W Mine. Sediment and Water Control Facilities Plan SCC utilizes various types of structures to control the runoff from disturbed areas within the permit boundaries at the Seneca II-W Mine. In addition, surface mining activities will be designed and conducted to minimize disturbance 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 singly or in combination. Sediment control methods may include, but not be limited to the following: 1. Disturbing the smallest practicable area at any one time during the mining and construction operation; 2. Siabilizing graded material to promote a reduction in the rate antl volume of runoff; 3. Retaining sediment within disturbed areas; 4. Diverting runoff away from disfurbed areas including stockpiles, backslopes, and material storage; 5. Diverting runoff through disturbed areas using stabilized earth channels, culverts or pipes so as to prevent, to the extent possible, additional contributions of sediment to streamflow or to runoff outside fhe permit area; 6. Using temporary, secondary sediment control measures such as straw dikes, silt fences, small V-ditches, riprap, mulches, check dams, vegetative sediment filters, temporary cover crops, sediment traps, and other measures that will reduce overland flow velocity, reduce runoff volume, or trap sediment. Sediment traps, sumps and dozer basins will not have an PR-05 1 Revised 01/06