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• ~ 4.07 SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS <br />r1 <br />U <br />4.07.1 General Requirements <br />Each exploration hole, or other borehole well, or other exposed <br />underground opening will be cased, sealed, pluyged, or otherwise managed <br />to meet the requirements of this Section. Based on previous and <br />existing mining activities within the permit and adjacent areas, no acid <br />or other toxic drainage has been encountered. As will be demonstrated <br />in this Section, the Bear Coal Company plans to minimize or eliminate <br />disturbance to the prevailing hydrologic balance by sealing of drill <br />holes and other underground openings. Likewise, the safety of people, <br />livestock, fish and wildlife, and machinery in the permit and adjacent <br />areas will be ensured to the extent possible by the temporary or <br />permanent sealing activities proposed by the Bear Coal Company. <br />Any mine entry, which is temporarily inactive, but has a future useful <br />life, will be protected by barricades or other covering devices, fenced, <br />and posted with signs to prevent access into the entry and to identify <br />the hazardous nature of the opening. These devices will be periodically <br />inspected and maintained in good operating condition by the Bear Coal <br />Company. <br />4.07.2 Temporary Sealing <br />The Bear Coal Company does not anticipate any exploratory surface <br />drilling above the Bear No. 3 Mine. However, if drilling becomes <br />necessary, each exploration hole or other drill or borehole described in <br />this Section will be protected, inspected, and maintained according to <br />this Section. <br />4.07.3 Permanent Sealing <br />When no longer needed for mining operations, all entries or other <br />• openings to the surface from the underground mine will be sealed and <br />backfilled. The permanent closure measures will be constructed to <br />4.07-1 <br />