On May 1, 2013, the State of North Carolina, through the North Carolina Department of Environment and Natural Resources (NC DENR), submitted to EPA a state implementation plan (SIP) revision to satisfy North Carolina's commitment associated with the conditional approval of its reasonably available control technology (RACT) requirements for volatile organic compound (VOC) sources located in the North Carolina portion of the Charlotte--Gastonia--Rock Hill, North Carolina--South Carolina 1997 8-hour ozone nonattainment area (hereafter referred to as the "bi-state Charlotte Area"). The NC DENR May 1, 2013, SIP revision also includes additional changes to North Carolina's RACT rules. EPA is taking final action to approve a number of these SIP changes to the State's RACT rules and to convert the existing conditional approval of VOC RACT provisions in the North Carolina SIP to a full approval under the Clean Air Act (CAA or Act). EPA has evaluated the changes to North Carolina's SIP, and has made the determination that those being approved through this action are consistent with statutory and regulatory requirements and EPA guidance.