91.1. (Replaced, O.C. 501-2011)Intermittent emission reduction system: An existing copper smelting plant must be equipped with an intermittent emission reduction system using production shutdown or cutdown to reduce sulfur discharges.
The system must be operated at all times so as to comply with the atmospheric quality standards for sulfur dioxide prescribed in section 6.
O.C. 240-85, s. 6; O.C. 501-2011, s. 215.