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The Refinery Sector Rule was promulgated on December 1, 2015 (80 FR 7178). On April 10, 2018, the EPA proposed amendments to the NESHAP Refinery MACT 1 and Refinery MACT 2 regulations to clarify the requirements of these rules and to make technical corrections and amendments to requirements for work practice standards, recordkeeping and reporting. This action also proposed technical corrections to the NSPS for Petroleum Refineries (40 CFR part 60, subpart Ja). Proposed revisions included reducing recordkeeping requirements for maintenance venting activities, addressing the use of separation equipment in the delayed coker water-over-water discharge process, addressing pilot-operated PRD and air entrainment in flare assist systems, and corrections of typographical errors and cross-referencing errors. This action will address public comments received on the proposal and finalize amendments with the goal of eliminating uncertainty and simplifying compliance with the implementation of the December 1, 2015, final rule.