2007-08-17_PERMIT FILE - C1981035 (21)

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~. Signature of specialist: Loren Wickstrom 11-3-99 14. Invasive, Non-native Species Prevention, early detection, control and eradication of small noxious weed patches remain the most practical, economical and effective means of weed management. Weeds will be treated on an as needed basis. Currently, as all mining activities are conducted underground, no noxious weed issues exist. Signature of specialist: Melissa Werkmeister 11-3-99 NON-CRITICAL ELEMENTS 1. Soils Direct Impacts -Since no active surface disturbance is proposed, no soil impacts would result from this action. Subsidence could occur, which could result in some low-volume, localized soil erosion. Indirect Impacts - No impacts have been identified. ' • Cumulative Im acts - At the time that support pillazs are removed, a cumulative impact from subsidence could occur throughout the mined area. However, in light of the requirement in State regulations to conduct operations in such a manner as to control or prevent effects of subsidence, this is not expected to be a major concern. 2. Geology and Mineral Resources Direct Impacts- Subsidence fractures could impact topography and surface features in the area of the proposed lease. The DMG rules require that "underground mining activities shall be planned and conducted so as to prevent subsidence from causing material damage to the surface..." Material damage is defined with respect to subsidence as changes which prevent restoration of affected structures and with respect to renewal resource lands; changes which disrupt an aquifer, or a rechazge area to an aquifer, which serves as a beneficial use of water; or changes whichprevent restoration ofproductivity for agricuhural lands. Implementation ofthese regulations will minimize the impacts of subsidence. In addition, National King Coal's permits to mine coal from Colorado DMG and OSM require that the company monitor subsidence on a quarterly basis. Some monitoring is also preformed 13