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2x6 timbers ABC Dry Chemical accident prevention adequate barricades blasting boiler bracing brakes cable caissons carbon monoxide center to center checked clean cofferdam compressed air concrete condition construction contractor Crossbraces damage decompression illness designed devices electric employees engineer epoxy equipment excavation explosives fastened feet fire extinguishers flammable liquids floor fuel gases guard rails guarded handling hazards hoisting hoistway hydrostatic test inches inspected installed ladders lifting lights lines load located lock maintenance manual manufacturer's material metal minimum moving National Electrical Code operations permitted personnel pile pipe placed planks platform powder actuated tools pressure vessels proper protection rails recommended removed repairs Revised Dec safe safety scaffolds securely shoring side signals signs steel storage strands structure timbers for depths timbers spaced tion Toeboards tower cranes traffic trench truck tunnel Uprights valves vehicles walkways weight welding wire rope workmen worn