40 CFR § 60.170
Applicability and designation of affected facility
June 9, 2020
(a) The provisions of this subpart are applicable to the following affected facilities in primary zinc smelters: roaster and sintering machine.
(b) Any facility under paragraph (a) of this section that commences construction or modification after October 16, 1974, is subject to the requirements of this subpart.
[42 FR 37937, July 25, 1977]