All per­sons appoint­ed by the Chair­man of the Union Coun­ty Board or hired as depart­ment head by any oth­er Board shall be res­i­dents of the Coun­ty.  All per­sons appoint­ed by the Chair­man or hired as a depart­ment head by some oth­er Board who are not res­i­dents of the Coun­ty shall be approved by the Coun­ty Board.  Upon appoint­ment, such indi­vid­u­als shall become res­i­dents of Union Coun­ty with­in nine­ty (90) days.