The County Council may accept federal, state, and private grant funds. The Chief Administrative Officer shall submit to the County Council a budget, which shall not be part of the General Operating Budget or of the Capital Budget, for the expenditure of each such grant. Approval of such a budget shall constitute an appropriation of the sum specified therein for the purpose indicated. Such appropriation shall be considered valid until the funds are expended. The Chief Administrative Officer under the supervision of the County Executive shall be responsible for the administration of grant budgets.