(a) The township supervisor shall be ex officio treasurer and the custodian of all funds derived from the issuance and sale of bonds under this Article and of all income and revenue derived from the operation of the system. Before the supervisor receives any funds, he or she shall post with the township board, subject to their approval, a separate corporate surety bond in an amount determined by resolution of the township board. The supervisor shall keep the proceeds of bonds issued and revenues derived from the operation of the system separate and apart from all other funds that come into his or her hands as supervisor and ex officio treasurer of the township. The supervisor shall deposit the proceeds derived from the sale of bonds and the income and revenues derived from the operation of the system in separate bank or savings and loan association accounts in a depositary designated by the township board for that purpose.
     (b) No bank or savings and loan association shall receive public funds under this Section unless it has complied with Section 6 of the Public Funds Investment Act.