(A)   Grease, oil, and sand traps shall be provided, operated, and maintained when, in the opinion of the Secretary, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, or other harmful ingredients; except that such traps shall not be required for private living quarters or dwelling units. An approved grease trap shall be mandatory for all service stations and restaurants. All traps shall be of a type and capacity approved by the secretary, and shall be located as to be readily and easily accessible for cleaning and inspection.
   (B)   All industrial wastes shall be pretreated when required by the city. Pretreatment may include, but is not limited to, vibrating or rotary screens to remove any particle larger than 20-mesh and such other facilities as may be determined necessary by the city to render the waste acceptable for admission to the public sewers. All wastes containing soil, dirt, and/or sand shall be settled a minimum of two hours in an acceptable basin before discharge to a public sewer.
(Ord. 46, passed 4-8-1975)