In Section R307-403-1, changed text to specify which portion of this rule supplements permitting requirements. Additionally, added text clarifying EPA's role in approving demonstrations satisfying 40 CFR 51.1006(a)(3). In Section R307-403-2, corrected incorrect text, clarified yearly duration by adding the word "calendar" to the text, clarified precursor by adding the word "individual" to the text, amended text to ensure more comprehensive application of NNSR requirements, "shall trigger offset requirements" was stricken and replaced with language that applies "the requirements of R307-403" to potential increases of nitrogen oxides, sulfur dioxide, and PM2.5 precursors. In Section R307-403-3, clarifies language by revising text to read: "the restrictions on new or modified sources identified in 40 CFR 52.24 are not applicable." In Section R307-403-4, the text was added to ensure emission offsets must be surplus, permanent, quantifiable, and federally enforceable as indicated in 40 CFR 50.165. Additionally, the following statement was added to the end of the paragraph: "Offsets may not be traded between pollutants, except as required only to satisfy R307-403-5(1) where it pertains to emission increases that are not considered major for PM10 or a PM10 precursor." In Section R307-403-5, text was amended to provide additional clarification, reorganized for easier use by reader, and clarifies 1 - 1 ratio requirements and rounding of measurements to meet that ratio. Additionally, multiple revisions were made to distinguish between offsetting ratios for emission increases greater than 50 tpy and emission increases between 25 - 50 tpy. (EDITOR'S NOTE: The original proposed amendment upon which this change in proposed rule (CPR) was based was published in the April 1, 2018, issue of the Utah State Bulletin, on page 50. Underlining in the rule below indicates text that has been added since the publication of the proposed rule mentioned above; strike-out indicates text that has been deleted. You must view the CPR and the proposed amendment together to understand all of the changes that will be enforceable should the agency make this rule effective.)