A. No statement contained in this chapter shall be construed as prohibiting any special agreement or arrangement between the city and any person, whereby an industrial waste of unusual strength or character may be admitted to the sewage disposal works, either before or after pretreatment; provided that there is no impairment of the functioning of the wastewater treatment system by reason of the admission of the wastes, and no extra costs are incurred by the city without recompense by the person.
B. If any waters or wastes are discharged, or are proposed to be discharged to the city sewers, which waters contain the substances or possess the characteristics enumerated in this title and which, in the judgment of the Superintendent of Public Works, may have a deleterious effect upon the sewage works, processes, equipment or receiving waters, or otherwise create a hazard to life or constitute a public nuisance, the city may:
1. Reject the wastes;
2. Require pretreatment to an acceptable condition for discharge to the public sewer, including a minimum of 2 hours of settling for wastes containing soil, dirt and/or sand;
3. Require control over the quantities and rates of discharge by constructing equalization basins or by other appropriate methods; or
4. Require payment to cover the added cost of handling and treating the wastes not covered by the existing sewer charges.
C. If the Superintendent of Public Works permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the city and subject to the requirements of all applicable costs, ordinances and laws.