Ill. Admin. Code tit. 35 § 304.202
The mercury discharge standards of Section 304.124 and 35 Ill. Adm. Code 307.1102 do not apply to any manufacturing facility that operates chlor-alkali cells, is located in St. Clair County, and discharges directly or indirectly into the Mississippi River; or to any publicly owned treatment works that receives a manufacturing facility's wastewater. The amount of mercury discharged by any such manufacturing facility must not exceed an average of 114 g/day (0.25 pounds per day) during any calendar month and a maximum of 227 g (0.5 pounds) during any one day. Any publicly owned treatment works that, directly or indirectly, receives such a manufacturing facility's wastewater is entitled to discharge mercury exceeding the levels provided in Section 304.124 to the extent that the discharge exceeds those levels because of such a manufacturing facility's discharge.
Ill. Admin. Code tit. 35, § 304.202
Amended at 6 Ill. Reg. 563, effective December 24, 1981