The owner or operator of any best available retrofit technology (BART)-eligible source may apply for an exemption from the requirement to install, operate, and maintain BART-required control equipment, pursuant to the provisions of 40 Code of Federal Regulations §51.303. Any exemption request under this section requires initial approval from the executive director and final approval from the administrator of the United States Environmental Protection Agency (EPA). Exemption requests submitted to the EPA must be accompanied by written concurrence from the executive director.