A request for amendment of a site certification agreement shall be made in writing by a certificate holder to the council. The council will consider the request and determine a schedule for action at the next feasible council meeting. The council may, if appropriate and required for full understanding and review of the proposal, secure the assistance of a consultant or take other action at the expense of the certificate holder. The council shall hold one or more public hearing sessions upon the request for amendment at times and places determined by the council.