Va. Code Ann. § 35.1-6

The Board is authorized to issue orders to require any person to comply with the provisions of this title or any regulations promulgated by the Board, or to comply with any case decision, as defined in § 2.2-4001, of the Board or Commissioner. Any such order shall be issued only after a hearing with at least thirty days notice to the affected person of the time, place, and purpose thereof. Such order shall become effective not less than fifteen days after mailing a copy thereof by certified mail to the last known address of such person. The provisions of this section shall not affect the authority of the Board to issue separate orders and regulations to meet any emergency as provided in § 35.1-12.