National Emission Standards for Hazardous Air Pollutants for Iron and Steel Foundries Area Sources

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EPA is proposing national emission standards for hazardous air pollutants for two area source categories (iron foundries and steel foundries). The proposed requirements for the two area source categories are combined in one subpart. The proposed rule establishes different requirements for foundries based on size. Small iron and steel foundries would be required to comply with pollution prevention management practices for metallic scrap, the removal of mercury switches, and binder formulations. Large iron and steel foundries would be required to comply with the same pollution prevention management practices as small foundries in addition to emissions limitations for melting furnaces and foundry operations. EPA is also co-proposing two alternatives. One alternative would set a higher size threshold for large foundries. The second alternative proposes that all iron and steel foundries comply with the pollution prevention management practices for metallic scrap, the removal of mercury switches, and binder formulations. The proposed standards reflect the generally achievable control technology and/or management practices for each subcategory.