76-15-1005. Requirements for purchases or construction contracts. For contracts for the purchase of vehicles, machinery, equipment, materials, or supplies or for construction, repair, restoration, or maintenance under this chapter in excess of the limit provided in 7-5-2301, supervisors shall comply with the provisions of 76-15-1006 and award a contract according to the selection criteria for proposals and bidding as described in 18-4-303 and 18-4-304.