Case-by-case maximum achievable control technology (MACT) determinations
(4) Case-by-case maximum achievable control technology (MACT) determinations. If you propose to construct or reconstruct a major source of HAPs such that you are subject to a case-by-case MACT determination under section 112(g)(2) of the Act, you may elect to have this determination approved under the provisions of this program (other options for such determinations include a title V permit action or a Notice of MACT Approval under 63.43 of this chapter). If you elect this option, you still must comply with the requirements of 63.43 of this chapter that apply to all case-by-case MACT determinations.