All funds deposited by the treasurer in any bank shall be placed in the name of the Authority and shall be withdrawn or paid out only by check or draft upon the bank, signed by the treasurer and countersigned by the chairman of the Board. The Board may designate any of its members or any officer or employee of the Authority to affix the signature of the chairman and another to affix the signature of the treasurer to any check or draft for payment of salaries or wages and for payment of any other obligation of not more than $2,500.
70 ILCS 200/2-105