EPA is approving the State implementation plan (SIP) revisions submitted by the Governor of Colorado on November 12, 1993, August 25, 1994, September 29, 1994, November 17, 1994, and January 29, 1996. These submittals revised Colorado Regulation No. 3 and the Common Provisions Regulation pertaining to the State's new source review (NSR) permitting requirements. The submittals included revisions to make the State's NSR rules more compatible with its title V operating permit program, the addition of nonattainment NSR provisions for new and modified major sources of PM-10 precursors locating in the Denver PM-10 nonattainment area, a change from the dual ``source'' definition to the plantwide definition of ``source'' in the State's nonattainment NSR permitting requirements, and correction of deficiencies in the State's construction permitting rules. EPA proposed approval of these SIP revisions in the August 28, 1996 Federal Register, and no comments were received. EPA is approving these regulatory revisions because they provide for consistency with the Clean Air Act (Act), as amended, and the corresponding Federal regulations and guidance. Also, EPA is revising 40 CFR 52.320 to list various sections of the Common Provisions Regulation in the ``Incorporation by reference'' section which EPA approved in past actions but which EPA did not list in the CFR. Last, EPA is deleting two NSR rule disapprovals listed in 40 CFR 52.324(c) and 52.343(a)(1) because the State has submitted, and EPA has approved, revisions addressing the disapprovals.