The county board of commissioners shall be the governing body of the county. The board shall be charged with the administration of county affairs, including but not limited to:

(a) The hearing of all budget requests and the submission of a proposed annual budget for the operation of the affairs of the county which shall be submitted to the General Assembly not later than March fifteenth for appropriate action.

(b) The formulation and implementation of personnel policies for county employees including supervision of insurance programs, except that the rights of the constitutional officers of the county, the county tax collector, the auditor and the treasurer to select their own personnel shall not be infringed.

(c) The purchasing of all supplies and equipment by the county and the maintenance of inventory records thereon.

(d) Approval of expenditures from the contingent fund as it may be established from time to time by law.

(e) The supervision of all buildings and grounds owned by the county, including the allocation of office space in all county buildings and the providing of office space for all countywide officers.

(f) The acquisition of property by purchase or gift.

(g) The adoption, use and alteration of a corporate seal.

(h) The leasing or sale of property owned by the county.

(i) The making of contracts for the county.

(j) The exercise of the power of eminent domain within the county.

(k) The performance of such other acts necessary to carry out its responsibilities.

(l) The determination of its own rules and order of business.