How should the use of emergency shelters be tied to emergency supplies of breathable air?
3. If post-accident breathable air is provided through emergency shelters, provide information on appropriate distances between installations and proximity to working sections. Please provide specific feasibility considerations, if any. 4. Under what circumstances, if any, could a barricade be used as an emergency shelter to provide post-accident breathable air? Dated: August 25, 2006. David G. Dye, Acting Assistant Secretary for Mine Safety and Health. [FR Doc.