This subcategory applies to the discharge of pollutants to waters of the state and the introduction of pollutants into POTWs from sintering operations conducted by the heating of iron bearing wastes, such as mill scale and dust from blast furnaces, together with fine iron ore, limestone, and coke fines in an ignition furnace to produce an agglomerate for charging to a blast furnace.
Wis. Admin. Code Department of Natural Resources NR 254.02