National Emission Standards for Hazardous Air Pollutants: Polyvinyl Chloride and Copolymer Production Reconsideration; New Major Source Process Wastewater Standards

any ongoing reconstruction efforts. As such, the EPA does not anticipate that this action will have any immediate cost or emissions impacts (see section IV of this preamble for additional details). B. What changes did we propose for the PVC and Copolymer Production source category in our 2020 Proposal? In 2020, the EPA proposed reconsideration of several aspects of the 2012 Final Rule to resolve reconsideration issues that the D.C. Circuit had not addressed.\28\ These items included reconsideration of the process vent, stripped resin, and process wastewater emission limits; the process vent emission profile requirements; the pressure vessel provisions; the use of vapor balancing as a method of compliance; and the definition of the affected source. In addition, the EPA proposed technical corrections and clarifications to the alternative emission limit format for compliance with the stripped resin standards, the initial and continuous monitoring requirements for total non-vinyl chloride organic HAP emissions from stripped resin, the fixed and floating roof storage vessel provisions, the equipment leaks practices, and the closed vent system requirements.\29\ The EPA also proposed to remove the affirmative defense provisions and to make certain editorial changes to correct errors within the major and area source PVC NESHAP.\30\ ------------------------------------------------------