Md. Code, Env't § 8-506

(a) (1) Unless the person served with an order under § 8-503(a)(1) of this subtitle makes a timely request for a hearing, the order is a final order. (2) If the person served with an order under § 8-503(a)(1) of this subtitle makes a timely request for a hearing, the order becomes a final corrective order when the Department renders its decision following the hearing. (b) (1) If the Department issues a notice under § 8-503(a)(2) or (3) of this subtitle, the Department may not issue an order that requires corrective action by the person to whom the notice is directed until after the later of: (i) The time set for the hearing, if any; and (ii) The time set for filing of the report, if any. (2) After the time within which the Department may not issue a corrective order has passed, if the Department finds that a violation of this title has occurred, the Department shall issue an order that requires correction of the violation within a time set in the order. (3) Any order issued under this subsection is a final corrective order and the person to whom the order is directed is not entitled to a hearing before the Department as a result of the order. (c) The Department shall: (1) Take action to secure compliance with any final corrective order; and (2) If the terms of the final corrective order are violated or if a violation is not corrected within the time set in the order, sue to require correction of the violation.