In addition to the powers of the hearings official to administer and enforce the procedures enumerated elsewhere in sections 2.876 to 2.892, the hearings official shall be empowered to establish or modify procedural rules consistent with those sections to assist in its administration and enforcement. The procedural rules shall become effective thirty (30) days after being published and after a hearing is held on the rules, allowing the city agent and bargaining agents an opportunity to comment on them.