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The EPA is finalizing a suite of amendments to implementing regulations under 40 CFR part 60, subpart B. The EPA proposed six amendments governing the process for acting on Clean Air Act (CAA) section 111(d) state plans. These changes include: (1) Partial approval/disapproval mechanisms similar to CAA section 110(k)(3); (2) a conditional approval mechanism similar to CAA section 110(k)(4); (3) a mechanism for the EPA to make calls for plan revisions similar to the ‘‘SIP-call' provisions of CAA section 110(k)(5); (4) an error correction mechanism similar to CAA section 110(k)(6); (5) completeness criteria and a process for determining completeness of state plans and submittals similar to CAA section 110(k)(1) and (2); and (6) updates to the deadlines for the EPA action. These amendments are being finalized as a stand-alone final rule because once final, they will then be applicable to any future state and federal plans relating to Emission Guidelines promulgated pursuant to CAA section 111(d). The amendments to implementing regulations were proposed in the Clean Power Plan Federal Plan and Model Rule published on October 23, 2015.