Any tunnel, shaft, conduit, slope, or other underground work in the process of sinking, or any opening or excavation for the purpose of constructing any such shaft, tunnel, conduit, slope or other underground work within the corporate limits of the city, shall be subject to supervision and inspection under the direction of the commissioner of transportation who may appoint such inspectors for the purpose as the city council may authorize; provided, that the provisions of this chapter shall not apply to any such work constructed or performed by the city; and provided further, that such provision shall not apply to open cut work.
Inspectors of underground work shall be appointed by the commissioner of transportation according to law, and shall be practical and expert miners, experienced in tunnel and sewer work. The inspectors shall be competent persons with at least four years' practical mining experience, and having a practical and technical knowledge of the properties of mining gases, the principles of ventilation, the care and proper adjustment of hoisting engines, and the management and efficiency of pumps, ropes, and winding apparatus. The inspection herein provided for shall be paid for by, and be at the cost of, the person constructing any such work.
(Prior code § 180-1; Amend Coun. J. 12-11-91, p. 10925)
It shall be the duty of every person constructing any underground work within the corporate limits of the city to maintain, through any shaft, conduit, or underground work where men or animals are employed, currents of air sufficient for the health and safety of all the men and animals employed therein, and such ventilation shall be produced by fans or other artificial means.
The quantity of air to be kept in circulation and passage at a given point shall be not less than 75 cubic feet per minute for each person, and not less than 300 cubic feet per minute for each animal, measured at the foot of the downcast; and this amount may be increased in the discretion of the inspector whenever in his judgment unusual conditions make a stronger current necessary.
(Prior code § 180-2)
Every hoistway connecting any such underground work with the surface of the ground shall be equipped with a substantial cage for carrying persons. Each cage shall be safely constructed, shall be covered with heavy steel plate covers to protect the persons riding thereon from falling objects, and shall be equipped with adequate safety devices.
No more than one person shall be carried on each cage for each two square feet of floor surface.
(Prior code § 180-3)
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