2008-12-04_PERMIT FILE - C1994082A (12)

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• selected locations to reduce flow velocities in steeper portions of the channel and ensure stability. These check dam locations will be field located during the channel re-construction activities. The SEDCAD4 demonstration is located in Tab 13, Facilities; Attachment 13-12, Drainage and Sediment Control Plan. In addition to re-constructing YPM-12, a sediment pond (Pond 011A) will be constructed at the upper end of the channel (in a previously disturbed area) to provide a location for sediment retention and to serve as an energy dissipater for runoff until vegetation is established in the channel. Disturbance Area The maximum extent of all areas anticipated to be disturbed by mining, facility, and access construction, and all reGamation activities at Yoast have been identified and are entirely encompassed within the disturbance boundary as depicted on Exhibit 12-1, Operations Plan. The extent of this boundary was conservatively defined, and may incude areas, particularly in the vicinity of roads and impoundments, that will not be affected by any disturbance. An affected lands boundary map was not generated. The affected lands could be considered the area between the disturbance boundary and the permit boundary. The area within the mining disturbance boundary includes the area mined, the area upon which spoil is deposited • and graded, and where final highwalls have been reduced. A total of 2,318.3 acres are contained within the Yoast permit boundary. Exhibit 12-1, Operations Plan, depicts areas that could potentially be disturbed during the life-of-mine operations. The boundaries shown on this map were drawn to allow some degree of flexibility in operations. That is, if a haulage road had to be moved due to field adjustments, or a highwall reduction area required additional slope area, these operations could be conducted without revisions to the permit. In actuality, haul road disturbance is confined to a corridor approximately 100 feet to 200 feet wide. The permitted mine disturbance acreage of 1,019 acres reflects the shaded area as shown on Exhibit 12-1, Operations Plan, including the areas associated with the North Entrance Road. This area is conservatively overestimated for the reasons stated above. At the end of year 2007, the year that coal production ended, there was a cumulated total of 848.6 acres disturbed over the life-of-mine. Permanent Structures and Features A variety of structures will be left as permanent features on the postmining topography to enhance the postmining land use. These features and structures include: • Access roads • • Light-use roads • Water well TR-37 11 Revised 02/08