Section 7112 - Shaft Work-Major Repair(a) To prevent injury to men and keep materials from falling down the shaft while extensive repair work is carried on, the following precautions shall be taken: (1) A substantially constructed bulkhead shall be secured in place in the compartment where the repair operations are carried on, and as close below where the men are working as is practical.(2) (19-77) When the shaft conveyance is lowered to the working place, it shall be stopped at least 15 feet above the working place and shall be held there until a further signal is given by the repair crew.Cal. Code Regs. Tit. 8, § 7112