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West Elk Mine <br />If, through the monitoring activities, it is determined that mine-related subsidence causes <br />new movement of landslides and slumps MCC will mitigate damages to the impacted <br />drainages. For example, if stream courses are blocked by mining induced slide movement, <br />MCC will use hand tools or appropriate heavy equipment to reopen affected channels. The <br />necessary permits to perform such work will be obtained prior to performing mitigation. <br />Other mitigation could include the placement of straw bale dikes or silt fences below slide <br />areas to reduce sediment loading. Stream channels and ditches will be repaired using <br />bentonite, bentonite/soil mixes, or available soil to fill cracks if they occur in the channel <br />bottoms and divert water. Culverts could also be used to temporarily maintain stream <br />flows until other appropriate mitigation can be implemented. If ponding occurs within the <br />stream channels and is not determined to create a hazard to the public, no additional <br />mitigation is proposed. However, if the ponding creates hazardous conditions, the <br />structure creating the ponding may be breached or bypass channel built. The mitigation <br />work will only be accomplished after the appropriate permits are obtained. <br />If subsidence of existing SOD wetlands raises the water table to a point where the wetlands <br />are in danger of destruction, the CDMG and Forest will be notified and appropriate <br />actions be taken. These actions may include excavating the portion of the channell that has <br />created the damming effect on the wetlands. No action may be appropriate where the <br />ponding would result in an overall increase in wetlands and creation of habitat that would <br />benefit waterfowl and other wildlife. <br />If subsidence in the area of SOD wetlands creates a change in the gradient that would <br />result in a lowering of wetland water table, modifications to the stream channel to stabilize <br />the water table may be necessary. The mitigation efforts may include the construction of <br />rock dams or weirs that would act as impediments to stream flow and result in the re- <br />establishment of the wetland water table levels. The Best Currently Available Technology <br />will be used to restore the water levels of the wetlands if necessary and only implemented <br />after obtaining approval. <br />Areas that are devoid of vegetation as a result of slump or landslide movement related to <br />mine activities will be re-vegetated. Applications of appropriate seed mixes and planting of <br />seedlings will be performed as needed. The reseeded areas may be covered with erosion <br />control matting if needed. Application of straw mulch may also be appropriate in selected <br />areas. The seed mixes and seedlings used will be appropriate for the area disturbed and <br />approved by the governing agencies before application or planting. <br />Protection of Public Parks and Historic Places - 2.05.6(4) <br />Operations at the West Elk Mine are not located neaz public pazks or historic places; therefore, this <br />section does not apply. <br />Surface Mining Near Underground Mining - 2.05.6 (5) <br />There aze no surface mining operations proposed neaz the West Elk Mine. <br /> <br />1.05-92 Revised June 200s PRlO <br />