Any discharge matter which may be made to comply with the discharge standards, herein contained, may be discharged into the sewer system provided it is treated, at the producer's expense, prior to discharge (pretreatment) thereby bringing it into compliance with the declared standards. Such pretreatment plans 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 director, shall not be put into operation without written approval of the city engineer, 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 director at any time; provided, however, that the producer, in lieu of the treatment of said sewage, as hereinabove provided for, may, with the written approval of the director being first obtained discharge said sewage, waste or other matter into the said sewage system. (Ord. 168, 7-8-1992)
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