Payroll deductions shall begin in September and be one-tenth (1/10) of the certified dues and shall be taken from the following ten (10) paychecks. The initial deduction for any Employee shall not begin unless both (1) a properly executed "Voluntary Authorization for Deduction of Dues" and (2) the amount of monthly membership dues certified by the treasurer of the Association has been delivered to the University at least thirty (30) calendar days prior to the last pay day of the calendar month. Changes in the amount of the monthly membership dues must be delivered to the University at a place designated by the University at least thirty (30) calendar days prior to the last pay day of the calendar month before the change will become effective.