(a) Grease, oil and sand interceptors shall be provided when, in the opinion of the Loudoun County Sanitation Authority, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or of 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 Authority and shall be so located as to be readily and easily accessible for cleaning and inspection.
(b) 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.