A person discharging industrial wastes into public sewers prior to the effective date of this chapter may continue without penalty so long as he:
A. Does not increase the quantity or quality of discharge without permission of the approving authority;
B. Has discharged the industrial waste at least six (6) months prior to the effective date of this chapter; and
C. Applies for and is granted a permit no later than one hundred twenty (120) days after the effective date of this chapter.
(1999 Code § 6-316)