8 CAR § 42-305. Applications for proposed significant modifications at part 70 sources

(a) Part 70 sources proposing to construct a new emissions unit or modify an existing emissions unit shall apply for and obtain a modified part 70 permit prior to the construction or modification of such emissions unit. (b) This applies only to significant modifications and does not apply to modifications that qualify as minor modifications or changes allowed under the operational flexibility provisions of a part 70 permit.