This change to the proposed rule clarifies the definition of a "Centralized Tank Battery", the definition of "Emergency Relief Storage Vessel", the definition of "Uncontrolled Emissions", how emergency relief storage vessels would be regulated under this rule, and to broaden the methods for determining emissions and type of emissions (uncontrolled versus controlled). These changes provide more flexibility to determination of emissions and clarify applicability of rules. The emergency relief storage vessels changes were due to questions regarding their applicability to the proposed rule. This required the addition of requirements for such vessels as they are regulated differently from production and operational vessels. (EDITOR'S NOTE: The original proposed new rule upon which this change in proposed rule (CPR) was based was published in the October 1, 2017, issue of the Utah State Bulletin, on page 73. Underlining in the rule below indicates text that has been added since the publication of the proposed new rule mentioned above; strike-out indicates text that has been deleted. You must view the CPR and the proposed new rule together to understand all of the changes that will be enforceable should the agency make this rule effective.)