Where required by the City, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable structure, or control manhole, with necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of wastes. The structure shall be accessible and safely located and shall be constructed in accordance with plans approved by the City. The structure shall be installed by the owner at his or her expense and shall be maintained by the owner to be safe and accessible at all times.