(a) Applications may be filed for renewal of special minimum wage certificates.

(b) If an application for renewal has been properly and timely filed, an existing special minimum wage certificate shall remain in effect until the application for renewal has been granted or denied.

(c) Workers with disabilities may not continue to be paid special minimum wages after notice that an application for renewal has been denied.

(d) Except in cases of willfulness or those in which the public interest requires otherwise, before an application for renewal is denied facts or conduct which may warrant such action shall be called to the attention of the employer in writing and such employer shall be afforded an opportunity to demonstrate or achieve compliance with all legal requirements.