Except for gross negligence or willful or wanton misconduct, neither the members of the authority nor any officer or employee of the authority, acting on behalf thereof and while acting within the scope of his responsibilities, shall be subject to any liability resulting from:
(1) The design, construction, ownership, maintenance, operation, or management of a project; or
(2) The carrying out of any of the discretionary powers or duties expressly provided for in this part.