Greased oil or sand interceptors or traps shall be provided when, in the opinion of the Superintendent of Water Pollution Control, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, sand or other harmful ingredients except that such interceptors or traps shall not be required for private living quarters or dwelling units. All interceptors or traps shall be of a type and capacity approved by the Superintendent of Water Pollution Control or the Director of Utilities and shall be located as to be readily and easily accessible for cleaning and inspection. Grease or oil interceptors or traps 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. Where installed, all grease, oil or sand interceptors or traps shall be maintained by the owner, at his expense, in continuously efficient operation at all times. (Ord. 19-91. Passed 3-18-91.)