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The proposed refuse disposal area will allow the disposal of <br />approximately 350,000 tons of refuse material. Tliis will accom- <br />modate refuse from f~roduction of in excess of 5 million tons of <br />coal, assuming an average of So refuse generation by weight. This <br />storage area is expected to provide capacity for the first five <br />years of the mine life, after which the same system will be <br />developed in further worked out panels. There is excess refuse <br />disposal capacity in the mine plan for all future requirements. <br />A letter from MSHA regarding tl~e permittability of this type of <br />disposal method is provided in Exhibit 4.3-2. <br />4.3.6.3 Disposal of Rock Tunnel Material <br />The two portal areas, as shown iri Figure 9.2-3, are located at an <br />elevation of 5850 feet, which places them on the lower slopes of <br />the main ridge. Initially, very little working area was available • <br />in front of the portals, but during the portal facing and er.eava- <br />tion, small pads were construcr_ed using rock from the tunnel <br />development. To further improve safety conditions and vehicle <br />maneuvering, NCIG proposes to again use tunnel development rock to <br />extend both pads and widen the access roads, particularly to Portal <br />#1. The total remaining volume of rock to be removed from the <br />tunnels and cross-cuts (assuming a swell factor of 1.3) is about <br />11,000 yds'. <br />A detailed evaluation of the design of these pad extensions has <br />been performed as part of this pei.-mit application, and is presented <br />in Appendix 4.3-9. The conclusions of that study are that: <br />1. The proposed pad expansions will increase the stability of the <br />material that is presently F~laced at the tunnel portals, such <br />that the minimum factor of safety for the pads will now be <br />NCIG - Coal Ridge #1 4-50 ABC/1145/910509 • <br />