2011-03-22_PERMIT FILE - C1981033A

Home Browse Search

!~°` • will leave the surface in a "rough" condition on the contour. The resulting rough surface will help increase rainfall infiltration needed to promote plant establishment and growth, to reduce runoff potential and to minimize erosion while providing a topographic configuration similar to the pre-mining condition. The final surface as shown on the Existing and Final Contours and Sections Map, (Map 12) will match the overall approximate pre-mining grade. The anticipated final surface configuration of the surface facilities area, in conjunction with the existing topography, are shown on Map 12. The pre-mining topography is shown on the Vegetation Map, (Map 3). Temporary Sealing of Underground Openings Any mine entry which is temporarily inactive, but has a future useful life, will be protected by barricades or other covering devices, fenced, and posted with signs to prevent access into the entry and to identify the hazardous nature of the opening. These devices will be periodically inspected and maintained in good operating condition. • Permanent Sealing of Underground Openings When no longer needed for mining operations, all entries or other openings to the surface from the underground mine will be sealed and backfilled. Permanent closure measures will be constructed to prevent access to the mine workings by people, livestock, wildlife, and machinery. Because of the geologic nature of the coal seams, the entries slope toward the portal area. However, there has never been any gravity discharge of water from the previous underground operations. Furthermore, no acid-producing or toxic producing elements are found in the coal seam. The Operator does not anticipate any discharge from the permanently abandoned mine portals. The analysis of overburden and interburden indicates an absence of any acid or toxic forming material as described in Section 2.04.6. • 2.05-28 Rev. 02-10-93