Whenever a vacancy exists in the classified service, or a new position is to be created, the Appointing Authority shall immediately notify the Commission of the fact. When any such vacancy is to be filled, the Appointing Authority shall make a requisition upon forms prescribed by the Commission for the certification of names of eligibles for such positions and shall state whether the position is temporary or permanent, (if temporary, the duration of the employment) and any additional requirements that may be deemed necessary.