In the event that the Chief of Police determines that there exist conditions affecting public safety which require the appointment of certified police officers without competition, the Chief of Police shall request, in writing, that the Police Civil Service Board, in accordance with these rules, conduct recruitment for the purpose of filling the requested number of police officer positions. The process for the appointment of certified police officers without competition in the rules shall be in addition to, and not in lieu of, the process for appointment of police officers in accordance with the civil service examination and grading requirements in these rules.