All commercial, restaurant and others involved in food preparation shall have grease, oil and sand interceptors. Grease, oil and sand interceptors shall be provided for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand or 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 authorized City representative, and shall be located as to be readily and easily accessible for cleaning and inspection. Owners shall maintain records of maintenance and cleaning of grease, oil and sand interceptors. These records shall be presented to the authorized City representatives upon request.