(1) Payment of the principal of and interest on those obligations of the joint operating agency for which payment has not otherwise been provided;
(2) All payments which the agency is obligated to set aside in any special fund for the repayment of obligations and to provide reserves therefor;
(3) Payment of taxes as provided by ORS 262.105; and
(4) Payments for the proper administration, operation, maintenance, repair, renewals and replacements of utility properties of the joint operating agency and to provide reserves therefor. [1973 c.722 §10]