40 CFR § 62.15940
How do I renew my lapsed operator qualification?
June 9, 2020
You must renew a lapsed operator qualification before you begin operation of an SSI unit by one of the two methods specified in paragraphs (a) and (b) of this section:
(a) For a lapse of less than 3 years, you must complete a standard annual refresher course described in §62.15935; and
(b) For a lapse of 3 years or more, you must repeat the initial qualification requirements in §62.15920.