The withdrawal authorized by RSA 100-A:43 may occur upon the following conditions:
I. That 3/4 of the officers and employees of said employer who are members of the retirement system and who are eligible under the provisions of RSA 100-A:10 for a vested deferred retirement allowance vote to withdraw, such vote being advisory only; and
II. If the governing body shall elect to withdraw as a participating employer and further, that the governing body submits written notice of the employee vote and the request to withdraw to the board of trustees of the New Hampshire retirement system.