Waste products from manufacturing or industrial operations shall not be introduced into the public sewer system until it has been determined by the superintendent of the water and sewer department that the introduction thereof will not cause damage to the public sewer system or interfere with the functioning of the sewer treatment system. Wastes which, in the opinion of the superintendent of the sewer department are voluminous and not in need of treatment, shall not be discharged into the sewer system of city but shall be disposed of as stormwater. (1991 Code § 4-44; amd. 2011 Code)