Before any matter of any nature may be discharged into the sewer system, which discharge might reasonably be considered a violation of this Chapter, the controlling characteristic of such matter shall be determined to the satisfaction of the Director. The responsibility of initiating such determination, any costs involved, and of submitting the results of said determinations to the Director for his approval lie solely with the party or parties desiring to discharge the matter into the sewer system. Verification of these results and the decision as to whether or not a permit shall be issued, shall be the responsibility of the Director. The fact that any matter has been discharged into the sewer system prior to the passage of this Chapter or subsequent thereto but without any objection from the Director does not constitute a valid right to so discharge such matter. If, upon discovery by the Director at any time that any matter being discharged into the sewer does not conform to the requirements of this Chapter, the Director may immediately stop the discharge of such matter into the sewer system.