(b) Upon the expiration of the term of a trustee who is in office at the time of the publication of each decennial Federal census of population, the successor shall be a resident of whichever county is entitled to such representation as determined under subsection (a), and he shall be appointed by the county board of that county, or in the case of a home rule county as defined by Article VII, Section 6 of the Illinois Constitution, the chief executive officer of that county, with the advice and consent of the county board. Thereafter, each trustee shall be succeeded by a resident of the same county who shall be appointed by the same appointing authority. The appropriate appointing authority shall appoint trustees biennially for such district on the first Monday in July, to fill the vacancies on the board of trustees caused by the expiration of the term of office of trustees and the trustees shall be legal voters and reside within the park district; provided, that no more than 4 trustees at any one time shall belong to the same political party. Each of the trustees shall receive a certificate of appointment and qualify within 10 days from the receipt of notice of appointment. Trustees shall be appointed for a period of 4 years and shall hold their office until their successors are appointed and qualified.
Whenever a vacancy is created other than by the expiration of a trustee's term of office, it shall be filled by the appropriate appointing authority as provided in subsection (a).
All trustees appointed for any park district, as herein provided, shall have and exercise all the powers conferred upon trustees elected under the provisions of this Code.
In a Pleasure Driveway and Park District the trustees of which are appointed as herein provided, whenever a provision in this Code or any other applicable law authorizes a public question of any kind to be submitted to the electors of the district at an election, a petition by electors of the district asking that such question be submitted shall be signed by a number of registered voters of such district equal to not less than 10% of the number of registered voters in the district as of the last preceding regular election.