The director may include the costs of undertaking, administering, operating, and maintaining the water pollution control loan programs for which the bonds are issued in determining the principal amount of bonds to be issued. In determining the cost of undertaking, administering, operating, and maintaining the loan programs, the director may include the cost of studies and surveys; insurance premiums; underwriting fees; financial consultants, legal, accounting, and other services incurred; reserve account, trustee, custodian, and rating agency fees; and interest on the bonds for a period not to exceed one year beyond the estimated completion of the loan projects for which the bonds are issued.