The Director of Public Service shall be selected on the basis of his administrative and executive qualifications. He shall be subject to the same qualifications as those of the Mayor except that he need not have had three years residency upon taking office. The Director of Public Service shall be responsible for the construction, improvement and maintenance of all public streets and sidewalks, public buildings, cemeteries; shall manage the divisions of streets and sidewalks, engineering, welfare, records, the building department, cemeteries, and public buildings; and he shall perform other duties assigned by the Mayor, Council, and ordinances and resolutions not inconsistent with this Charter. The Director of Public Service shall appoint one Deputy Director of Public Service to serve at his pleasure and with the approval of Council he may appoint other deputies or assistants as needed, and deputies or assistants so appointed shall not be subject to the Civil Service provisions of this Charter.