S.C. Code Regs. § § 103-164
Any suspension of the operations authorized by a duly issued certificate for a period in excess of thirty (30) days may be approved by the commission upon written application of the motor carrier, filed in accordance with 103-830, et seq. Such application must state clearly and concisely the justification for the proposed suspension of service.
An application for suspension for a period in excess of twelve (12) months, or an application for suspension which, if approved, would result in the continuous suspension of service (e.g., where an approved suspension is in effect at the time the application is filed) for a period in excess of twelve (12) months, may be approved by the commission after such notice, if any, that the commission deems appropriate.
S.C. Code Regs. § 103-164