Section NR 256.30 - Applicability; description of the ferrous casting subcategory(1) This subchapter applies to discharges to waters of the state and to introduction of pollutants into publicly owned treatment works from ferrous casting operations. It applies to a production process if the molten metal contains, on average, greater than 50% by weight of ferrous metal or if ferrous metal comprises the greatest percentage of the metal, measured by weight.(2) Ancillary scrubber operations, such as fan washes and backwashes, are covered by the mass limitations of the associated discrete wet scrubbing device. Water discharges from aftercooling devices are not regulated as a process wastewater in this subcategory.(3) Processing operations following the cooling of castings, except for grinding scrubber operations, may be regulated by the electroplating point source category under ch. NR 260, or metal finishing point source category under ch. NR 261.Wis. Admin. Code Department of Natural Resources NR 256.30
Cr. Register, June, 1989, No. 402, eff. 7-1-89.