(A) Grease, oil, sand and sediment traps shall be provided when determined necessary by the WWTP Superintendent for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, sediment and other harmful ingredients. All traps shall be of a type and capacity approved by the WWTP Superintendent and shall be located so as to be readily and easily accessible for cleaning and inspection.
(B) Grease and oil 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 that, when bolted in place, shall be gas tight and water tight.
(C) All grease, oil and sand interceptors shall be provided and maintained by the owner, at the owner's expense, in continuous efficient operation at all times.
(D) Bar screens shall be provided when determined necessary by the WWTP Superintendent for the proper removal of rags, plastics, paper products or other materials which may enter the POTW and cause blockage.