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This proposal will address the agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Integrated Iron and Steel Manufacturing Facilities. The Iron and Steel Manufacturing Facilities NESHAP, subpart FFFFF, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on May 20, 2003, and subsequently amended on July 13, 2006. The NESHAP established emission limitations and/or work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from iron-making blast furnaces; steel-making oxygen furnaces; ancillary operations, such as ladling, hot metal transfer, skimming and desulfurization; and sinter plants. The HAP emitted from iron and steel sources include metal HAP (all sources) and volatile HAP (sinter plant only). This action will implement the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). The statute directs the EPA to promulgate emission standards under CAA 112(f)(2), within eight years after the MACT standards were established, if such standards are required to ensure the risks due to HAP emissions from these facilities are acceptable and that the NESHAP provides an ample margin of safety to protect public health or to prevent, taking relevant factors into account, an adverse environmental effect. CAA section 112(d)(6) requires the EPA to review and revise the MACT standards as necessary, taking into account developments in practices, processes and control technologies, no less often than every eight years. This RTR is subject to a court-ordered deadline of March 13, 2020, for a final rule. While conducting the RTR, the EPA also might consider possible options to address issues raised in Sierra Club's March 26, 2004, petition for administrative reconsideration, and issues included in the voluntary remand without vacatur ordered by the D.C. Circuit Court on 6/10/10, in Sierra Club v. EPA, Case No. 03-1205, if appropriate.