Bargaining unit employees shall retain any bank of unused sick days that the bargaining unit employee accumulated prior to July 1, 2012 in a “retained sick day bank.”Employees may use days from their retained sick day bank for the purposes set forth in Article 37-3. Up to 325 retained sick days earned from BOARD employment prior to July 1, 2012 and left unused in the retained sick day bank at the employee’s resignation, retirement or death shall be paid out at the employee’s rate of pay at the time of the employee’s separation based on the following qualifying events and in the following percentages: