Tunnels, shafts and caissons may not be used to store or hold detonators and explosives. Those for each round go directly from magazine to blasting zone and are loaded immediately, and any left over once loading ends must be taken out of the working chamber prior to hooking up the connecting wires. Whenever detonators or explosives enter an air lock, only the powderman, blaster, lock tender and employees needed to carry them may enter it, and no other material, supplies or equipment may be locked through with the explosives. Detonators and explosives must be taken into pressure working chambers separately. The blaster or powderman is responsible for receiving, unloading, storing and moving explosives and detonators on site. Metal pipes, rails, air locks and the steel tunnel lining must all be bonded electrically to each other and grounded near the portal or shaft, pipes and rails must be cross-bonded at intervals of no more than 1,000 feet along the tunnel, and each low air supply pipe must be grounded at its delivery end. Explosives used in wet holes must be water-resistant and Fume Class 1. When tunnelling in rock approaches mixed face, and while working in mixed face, blasting uses light charges with light burden on each hole, and advance drilling is done as the rock face approaches mixed face to find out how far the rock cover extends, what it is like, and how much distance remains to soft ground.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.