Approval and Promulgation of Air Quality Implementation Plans; South Dakota; Revisions to the Permitting Rules

The Environmental Protection Agency (EPA) is proposing to approve State Implementation Plan (SIP) revisions submitted by the State of South Dakota on October 4, 2017, related to South Dakota's Air Pollution Control Program. The October 4, 2017 submittal updates certain dates of incorporation by reference and reorganizes and revises certain rules. In this rulemaking, we are proposing action on all portions of the October 4, 2017 submittal, except for those portions of the submittal which do not belong in the SIP. This action is being taken under section 110 of the Clean Air Act (CAA).