The Office of Administrative Hearings shall dispose of a case or conduct a hearing and issue a final decision in:
(1) a Whistleblower Law hearing under § 5-310 of this article;
(2) an appeal under Title 11 of this article of a disciplinary action;
(3) a grievance under § 12-205 of this article; and
(4) an appeal under § 18-123 of the Public Utilities Article for the removal of an employee of the Washington Suburban Sanitary Commission.