When at the time it becomes necessary or desirable to discharge into the sewer system any matter from any source, which does not conform to the requirements previously outlined, it is required that before such matter may be discharged into the sewer system, the producer thereof shall pretreat same at his own expense to a degree that will produce an effluent which does conform to the requirements. Such pretreatment plants shall be understood to include grease traps, chemical or biochemical plants, sedimentation chambers and any other devices which effect a change of any nature in the characteristics of the matter being treated. Any and all such devices and equipment shall be subject to the approval of the utility superintendent, shall not be put in operation without a written permit of approval issued by the utility superintendent, shall be provided with all necessary features of construction to permit inspection of operations and testing of material passing through them and shall be open to the inspection of the utility superintendent at any time; provided, however, that the producer in lieu of the treatment of the sewage, as provided for in this section, may, with the written approval of the utility superintendent being first obtained, discharge the sewage, waste or other matter into the sewage system, and be subject to the payment of the additional cost of the treatment thereof. (Ord. 947-04 § 2).