Grease, oil and sand interceptors shall be provided when, in the opinion of the Plumbing Inspector, they are necessary for the proper handling of liquid wastes containing grease in excess of that indicated in § 150-17B or any flammable wastes, sand and other harmful ingredients, except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the City and shall be constructed such that they are readily and easily accessible for cleaning and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight and equipped with easily removable covers which when bolted in place shall be gastight and watertight.
