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appropriate locations to ensure stability. The proposed check dams will serve to slow down runoff <br />• velocities in the steeper portions of the channel. These check dam locations will be determined during <br />the re-construction activities. The SEDCAD runs are located in Tab 13, Facilities; Attachment 13-12, <br />Drainage and Sediment Control Plan. <br />In addition to re-constructing YPM-12, a sediment pond (Pond 011A) will be constructed at the upper <br />reaches of the channel lin previously disturbed area) to provide a location for sediment retention and to <br />serve as an energy dissipater for runoff until vegetation is established in the channel. <br />Disturbance Area <br />The maximum extent of all areas anticipated to be disturbed by mining, facility, and access <br />construction, and all reclamation activities at Yoast have been identified and are entirely encompassed <br />within the disturbance boundary as depicted on Exhibit 72-7, Operations Plan. The extant of this <br />boundary was conservatively defined, and may include areas, particularly in the vicinity of roads and <br />impoundments, that will not be affected by any disturbance. An affected lands boundary map was <br />not generated. The affected lands could be considered the area between the disturbance boundary <br />and [he permit boundary. The area within the mining disturbance boundary includes the area mined, <br />• the area upon which spoil is deposited and graded, and where final highwalls have been reduced. <br />A total of 2,318.3 acres are contained within the Yoast permit boundary. Exhibit 12-1, Operations <br />Plan, depicts areas that could potentially be disturbed during each permit term (1995-1999, 2000, <br />2004, and 20051• The boundaries shown on this map were drawn to allow some degree of flexibility <br />in operations. That is, if a haulage road had to be moved due to field adjustments, or a highwall <br />reduction area required additional slope area, these operations could be conducted without revisions to <br />the permit. In actuality, haul road disturbance is confined to a corridor approximately 100 feet to 200 <br />feet wide. The potential mine disturbance acreage of 940.6 acres reflects the shaded area as shown <br />on Exhibit 12-1, Operations Plan and the Aevegetaiion Map, Exhibit 22-1, Post Mining Vegetation, <br />This area is conservatively overestimated for the reasons stated above. This acreage does not include <br />the 65.0 acres associated with the dragline deadhead road, Therefore, a maximum of 1,005.6 acres <br />could be disturbed over the life of the mine. ISee Table 79-1) <br />TR-24 11 Revised 12/03 <br />