; (4) to coordinate and oversee the operation of all administrative, enforcement, and research activities of the Agency; (5) to adopt and use a seal; (6) to determine the character of and the necessity for the obligations and expenditures of the Agency; (7) the appointment and supervision of personnel employed by the Agency; (8) the distribution of business among personnel appointed and supervised by the Director and among administrative units of the Agency; (9) the use and expenditure of funds; (10) implementing this Act through rules, orders, guidance, interpretations, statements of policy, investigations, and enforcement actions