When required by the Superintendent of Public Works, the owner of any property served by a building sewer carrying industrial wastes shall install a suitable control manhole in the building sewer to facilitate observation, sampling, and measurements of the wastes. The manhole, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the Superintendent. The manhole shall be maintained by him so as to be safe and accessible at all times.
('83 Code, § 2.5(h)) Penalty, see § 50.999