Consistent with the provisions of this article, the secretary shall, at a minimum, maintain the following offices within the division:
(1) The Office of Abandoned Mine Lands and Reclamation, which is charged, at a minimum, with administering and enforcing, under the supervision of the secretary, the provisions of article two of this chapter;
(2) The Division of Mining and Reclamation, which is charged, at a minimum, with administering and enforcing, under the supervision of the secretary, the provisions of articles three and four of this chapter;
(3) The Division of Air Quality, which is charged, at a minimum, with administering and enforcing, under the supervision of the secretary, the provisions of article five of this chapter;
(4) The Office of Oil and Gas, which is charged, at a minimum, with administering and enforcing, under the supervision of the secretary, the provisions of articles six, seven, eight, nine and ten of this chapter; and
(5) The Division of Water and Waste Management, which is charged, at a minimum, with administering and enforcing, under the supervision of the secretary, the provisions of articles eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen and twenty of this chapter.