The Council may at any time remove any member of the Planning Commission, Board of Zoning and Building Appeals, Park and Recreation Board, Civil Service Commission, or Air Pollution Control Board for inefficiency, neglect of duty, malfeasance, misfeasance or nonfeasance in office, incapacity or incompetency; provided, however, that such removal shall not be effective without the concurrence of two-thirds of all members elected to Council, nor until such member shall have been notified in writing of the charge against him at least 10 days in advance of any hearing upon such charge by the Council and he or his counsel has been given an opportunity at such hearing to be heard, present evidence, or examine any witness appearing in support of such charge.