An agency may at any time amend its Conflict of Interest Code, subject to the provisions of Section 87303, either upon its own initiative or in response to a petition submitted by an officer, employee, member or consultant of the agency, or a resident of the jurisdiction. If the agency fails to act upon such a petition within ninety days, the petition shall be deemed denied. Within thirty days after the denial of a petition, the petitioner may appeal to the code reviewing body. The code reviewing body shall
either dismiss the appeal or issue an appropriate order to the agency within ninety days.