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45-Foot Chamber Accident experience adits aerial tramway Air Defense Command American Air Defense ammonia dynamite ammonia gelatin arch section B-2 Intersection biotite bolts installed Bureau of Mines Central Access Tunnel chain-link fabric chamber area Cheyenne Mountain completed Construction & Mining contractor's cubic yards detonated dome drill holes Drilling and Blasting Drilling and Loading drilling pattern driven dump epoxy resin equipment Exhaust Tunnel fans feet high feet wide FIGURE foot granite ground support grout Gunite hole depth holes drilled hollow reinforcing bar jumbo Line holes linear feet Loading Pattern millisecond delays mucking NORAD North American Air North and South perforated sleeve perimeter holes pilaster primacord primer stick reference elevation rock anchor rock bolts rock support roof plate safety South Access Tunnel south portal Steel Rib Sets Steel Tower tests thrust blocks Timber Segment Sets tion top bench top headings U.S. Army Utah Construction utility entrances ventilation zones of weakness