When required by the City, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling and measurement of the wastes. Such manhole, when required, shall be accessible and safely located, and shall be constructed in accordance with plans approved by the City. The manhole metering and sampling devices shall be installed by the owner at his expense, and shall be maintained by him so as to be safe, operable and accessible at all times.
(1977 Code Sec. 13.11)