A person discharging industrial wastes into public sewers prior to the effective date of this chapter may continue without penalty so long as he:
1. Does not increase the quantity or quality of discharge, without permission of the approving authority;
2. Has discharged the industrial waste at least thirty (30) days prior to the effective date of this chapter; and
3. Applies for and is granted a permit no later than thirty (30) days after the effective date of this chapter.
(Sewer Use Ordinance)