No statement contained in this subchapter shall be construed as preventing any special agreement or arrangement between the city and any industrial concern whereby any industrial waste of unusual strength or character may be accepted by the city for treatment, subject to payment therefor, by the industrial concern. In no event shall the terms and provisions of such special agreement cause the city to violate its NPDES permit or state disposal system permit or result in plant interference, pass through, or restrictions on sludge disposal. Additionally, any special agreement shall not agree to variances for industries from national categorical pretreatment standards. Whenever it is determined that any lot, parcel of land, building or premises is discharging industrial wastes of unusual volume, concentration or character, or of a greatly variable volume, a special rate for the class of users, taking into consideration the volume, biochemical oxygen demand value and suspended solids content of the industrial wastes and the nature of the use made of the sewer system may be adopted by resolution of the Council.
(Prior Code, § 3.21)