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(a) All reasonable precautions shall be taken to free the face or bank of the pit from loose materials that may be dangerous to employees.
(b) Where practicable, the face of the pit shall be given a slope so as to minimize the danger of rock falling on employees.
(c) (3-3) Whenever the division considers that the height and condition of the face constitutes a serious hazard to employees, it may require the installation of a bench or other suitable method of working.
(d) When a bench or multiple-bench method of operation is required, a setback of at least one-half the height of the single face or bank for each section of the face or bank shall be required.