Grease, oil and sand interceptors or traps shall be provided when, in the opinion of the authority, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand and other harmful ingredients; except, that such interceptors or traps will not be required for private living quarters or dwelling units. All interceptors or traps shall be of a type and capacity approved by the authority and shall be located so as to be readily and easily accessible for cleaning and inspection. They will be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature and shall be of substantial construction, to be gastight, watertight and equipped with easily removable covers. Where installed, all grease, oil and sand interceptors or traps shall be maintained by the owner at his expense in continuously efficient operation at all times. (Ord., 10-21-1978)