Grease, oil and sand interceptors shall be provided when necessary for proper handling of any liquid wastes containing grease in excessive amounts, any flammable wastes, sand or other harmful ingredients. Interceptors shall be of a type and capacity approved by the City Engineer and shall be located so as to be readily and easily accessible for cleaning and inspection. Interceptors shall be installed and maintained by the customer at the customer's expense and kept in continuously efficient duration at all times. Interceptors shall not be required for private living quarters or dwelling units, except that interceptors shall be required in a garage located on residential property which has a square footage exceeding 1,000 square feet.
('82 Code, § 3.318)