When waste streams from any facility are combined for treatment or discharge, pollutants in the combined discharge may not exceed the most stringent limitations for that pollutant applicable to any component waste stream of the discharge.
Ill. Admin. Code tit. 35, § 406.105
Former Section 406.105 renumbered to Section 406.202 at 8 Ill. Reg. 13239, effective July 16, 1984; new Section adopted at 11 Ill. Reg. 12899, effective July 27, 1987