The Fire Chief, subject to the direction of the City Manager, shall be in charge of the Fire Department, which shall consist of the Fire Chief and such number of volunteer firefighters as shall be deemed necessary by the City Manager. The City Manager may also arrange for the services of such number of firefighters as he or she deems necessary and may contract to pay them reasonable compensation for their services but such contract must be reduced to writing and approved by the governing body and must provide a maximum total compensation to be paid to firefighters during any year. The Fire Chief and firefighters shall have such powers and duties as are prescribed by statute and by ordinances of the city.