Section 31. Power of advice and consent

Appointment by the mayor of the
  commissioner of investigation and of the members of the art  commission,
  board  of health (other than the chair), board of standards and appeals,
  city  planning  commission  (other  than  the  chair),   civil   service
  commission,  landmarks preservation commission, tax commission, taxi and
  limousine commission, the public members of  the  environmental  control
  board,  and  the  public  members  of the waterfront management advisory
  board shall be made with the advice and consent of the council  after  a
  public hearing. Within thirty days after the first stated meeting of the
  council  after receipt of a nomination, the council shall hold a hearing
  and act upon such nomination and in the event it  does  not  act  within
  such period, the nomination shall be deemed to be confirmed.