Maryland Code, Natural Resources § 1-506

(a) Except as provided in subsection (e) of this section, the court may grant a stay of the proceedings brought pursuant to this subtitle upon motion of defendant made upon notice to all parties and to the Attorney General whether or not a party whenever there is pending any of the following at the time of commencement of an action brought pursuant to this subtitle:

(b) Except as provided in subsection (e) of this section, the court also may grant the stay provided for in subsection (a) of this section upon motion made by the Attorney General on behalf of the people of the State or by a State agency or official represented by him, whether or not he is a named party defendant.

(c) A stay shall be granted for a time the court considers reasonable for completion of the administrative or judicial proceeding, the pendency of which is the basis for the motion for the stay, but in no event may a stay be granted for longer than 90 days without a showing of sufficient cause by the defendant or the Attorney General.

(d) The court, upon motion demonstrating sufficient cause, may grant extensions of the stay for additional periods not to exceed 90 days each.

(e) A stay pursuant to this section may not be granted if the court finds that the condition or activity complained of either presents an imminent danger to the health, welfare, or safety of the people of the State or results in, or is likely to result in, irreversible or irreparable damage to the air, water, or other natural resources of the State except pursuant to § 1-504(f)(2) of this subtitle.