Exclusive jurisdiction of Board
51.9Where any question arises under sections 51.3 to 51.8 after the designation or the revocation of the designation of a construction project as a major project as to whether rights, duties and obligations exist or as to the nature of the rights, duties or obligations, the Board, in addition to the provision made in section 128 and without restricting the generality of that section, has exclusive jurisdiction to determine the question and its decision in respect of the question is final and conclusive for all purposes of the Act as if made under section 128.