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42.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />• <br />2.05.4 Reclamation Plan. <br />(2) (g) (Cont'd.) <br />;n the past, exploration and drill holes were plugged <br />from the bottom to a minimum of twenty feet above the <br />[op of the coal seam. Cement plugs were placed at [he <br />surface and the holes marked with meta] rods and tags. <br />This approach was approved by the United States Depart- <br />ment of the anterior, Rureau of Land Management. <br />Future exploration and drill holes will he sealed by <br />replacing cuttings in the hole and placing an oc[o <br />plug, spider plug or o[iier approved expanding plug ten <br />feet below the ground surface [o support a cement p]ug <br />to within three feet of [he ground surface. The holes <br />will be marked with metal rods and tags. See Figure <br />2.05-7 in the Final Abandonment Appendix, Volume 6.1. <br />The Orchard Valley West Mine entries are also designed, <br />located and will be constructed so as [o prevent or <br />control gravity discharge of water Erom the mine. Upon <br />abandonment, the portals and shafts will be sealed, as <br />• illustrated in Figure 2.05.6 in the Final Abandonment <br />Appendix, Volume 6A. This abandonment procedure, is <br />the same procedure as will be completed at the Orchard <br />Valley Mine. <br />-~ The fan shaft and intake shaft located at the fan level <br />at the Orchard Valley Mine have been sealed with earth <br />fill. The seals were completed to suffocate the mine <br />fire of June 1, 1986. Cas samples from the mine atmos- <br />phere confirm the effectiveness of these earth seals. <br />CG1; will permanently seal the shafts as illustrated in <br />Figure 7_.05.06. <br />The fan bench area has been sloped to prevent water <br />draining into the shaft seals. The mine atmosphere <br />will be regularly monitored For outside atmosphere <br />leakage to evaluate the continued effectiveness of the <br />seals. <br />Exploration drill holes in the Orchard Valley West Mine <br />aria will be sealed as described above. Several of the <br />drill holes have been completed as piezometers so that <br />ground ioater conditions may be evaluated. These drill <br />• Revised 10/l2/86 <br />Revised 07/13/87 <br />Revised 10/01/87 <br />77 <br />