The Department of Service shall be administered by the Director of Service. The Director shall be responsible for the general supervision, custody, care and maintenance of the public buildings, grounds, streets, sewers, Municipal utilities, cemeteries, and properties, owned or operated by the Municipality for the protection of the health, welfare, convenience, and necessity of the people. The Director shall perform such functions and duties with reference to the Department of Service as may be provided by the general laws of Ohio, the Administrative Code, ordinances or resolutions, or by the lawful order of the Manager.