This action finalizes the residual risk and technology review (RTR) conducted for the Taconite Iron Ore Processing source category regulated under national emission standards for hazardous air pollutants (NESHAP). In addition, we are taking final action addressing the exemptions previously allowed for periods of startup, shutdown, and malfunction (SSM) and clarifying that the emissions standards apply at all times. These final amendments include no revisions to the numerical emission limits of the rule based on the RTR. The amendments add electronic reporting of performance test results and compliance reports and make minor technical corrections and amendments to monitoring and testing requirements that will reduce the compliance burden on industry while continuing to be protective of the environment. While the amendments do not result in quantifiable reductions in emissions of hazardous air pollutants (HAP), this action results in improved monitoring, compliance, and implementation of the rule.