Maryland Code, Environment § 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:

(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.

(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.