(a) Following the initial establishment of a pact, in accordance with procedures established in the bylaws of the pact, jurisdictions which do not have fire departments may join an established pact upon meeting such conditions as the board of directors may fix.
(b) Not less than 90 days after delivering written notice to an officer of the pact, a member jurisdiction may withdraw from a pact after a vote of its governing body. In the event the withdrawal of one or more jurisdictions reduces the number of members but two or more members remain, it is intended that the remaining members should continue with the operation of the pact.