25 Pa. Code § 127.463 – Operating permit revisions to incorporate applicable standards.

(a) The Department will require revisions to an operating permit to incorporate applicable standards or regulations promulgated under the Clean Air Act after the issuance of the permit.
(b) The revisions shall occur as expeditiously as practicable, but not later than 18 months after the promulgation of the standards or regulations.
(c) A revision will not be required if the effective date of the standards or regulations is a date after the expiration of the permit term or if less than 3 years remain in the permit term.
(d) A revision issued under this section shall be treated as a permit renewal if it complies with the act and the regulations promulgated thereunder regarding renewals.
(e) Regardless of whether a revision is required under this section, the permittee shall meet the applicable standards or regulations promulgated under the Clean Air Act within the time frame required by standards or regulations.