(a) A majority of the members, including alternates acting for members of the Board, shall constitute a quorum, and any action of the Board shall require the concurring votes of at least a majority of those present and voting. At assembled meetings, all votes shall be cast in person.

(b) For routine and noncontroversial matters which do not require deliberation and exchange of views, and in matters of an emergency nature when there is not enough time to call an assembled meeting of the Board, the Board may also take action upon the concurring votes of a majority of its members by mail, telephone, or telegraph, but any such action by telephone shall be confirmed promptly in writing.