This action finalizes the residual risk and technology review (RTR) conducted for the Leather Finishing Operations source category regulated under national emission standards for hazardous air pollutants (NESHAP). In addition, we are taking final action addressing startup, shutdown, and malfunction (SSM), electronic reporting, and clarification of rule provisions. These final amendments address emissions during periods of SSM, add electronic reporting, and revise certain rule requirements and provisions. Although these amendments will not reduce emissions of hazardous air pollutants (HAP), they are expected to improve compliance and implementation of the rule.