(a) Addition to the Colorado State Implementation Plan of the Colorado Interstate Transport regarding the 1997 8-Hour Ozone Standard for the ``significant contribution,'' the ``interference with maintenance'' requirements, and the addition of ``interference with visibility protection'' requirements regarding the 1997 8-Hour Ozone and PM2.5 Standards, submitted by the Governor's designee on June 18, 2009 and March 31, 2010.
(b) Addition to the Colorado State Implementation Plan of the Colorado Interstate Transport SIP regarding the 1997 8-Hour Ozone and 1997 PM2.5 Standards for the ``interference with prevention of significant deterioration'' requirement, and the addition of the ``significant contribution'' and ``interference with maintenance'' requirements regarding the 1997 PM2.5 Standards, submitted by the Governor's designee on March 31, 2010. [77 FR 1039, Jan. 9, 2012]