While investigating, the Executive Director or designee shall decide whether a hearing is necessary to decide issues presented by the unit clarification petition. The Executive Director or designee may make a determination based on the investigation, without a hearing. If a hearing is found necessary, the Executive Director or designee shall make a recommendation to the Board. If the Board chooses a hearing for the unit clarification petition, the Board shall also assign a presiding officer for the hearing. The presiding officer and parties shall abide by the applicable hearing and post-hearing procedures set forth in this chapter for a unit clarification petition hearing.