Md. Code, Courts and Judicial Proceedings § 3-1102

A motor carrier is responsible for the expense of an emergency response, containment, cleanup, and abatement of a spill of hazardous materials in a traffic accident by a volunteer fire department, volunteer rescue squad, volunteer ambulance company, or the individual members of the department, squad, or company if the motor carrier:

(1) Transports a hazardous material in commerce on a highway in the State; and

(2) Is at fault and causes a traffic accident in the State that results in:

(i) A spill or discharge involving hazardous materials; and

(ii) An emergency response, containment, cleanup, and abatement by the volunteer fire department, volunteer rescue squad, or volunteer ambulance company.