Replenishment of Sick Leave Bank Days. A required minimum balance of five hundred (500) sick leave days shall be maintained in the Sick Leave Bank for members' utilization. Whenever the balance falls below five hundred (500) days, the membership shall be notified of the deficiency. To retain membership in the Sick Leave Bank, each member will be required to contribute two (2) days of his/her sick leave days to replenish the Sick Leave Bank. Each member's contribution will be made within forty-five (45) days of the deficiency notification. No additional contribution of sick leave days will be required until the remaining balance falls below the required minimum balance.