so credited shall be merged with amounts in such fund or account, and shall be available for the same purposes, and subject to the same conditions and limitations, as amounts in such fund or account. (d) Description of property The exact acreage and legal description of the property to be conveyed under subsection (a) shall be determined by a survey satisfactory to the Secretary of Homeland Security. (e) Reversionary interest If the Secretary of Homeland Security determines at any time that the real property conveyed under subsection (a) is not being used in accordance with the purpose of the conveyance specified in subsection (a) or that the County has violated the condition on the use of revenues imposed by subsection (b), all right, title, and interest in and to such real property, including any improvements thereto, shall, at the option of the Secretary, revert to and become the property of the United States, and the United States shall have the right of immediate entry onto such real property. A determination by the Secretary under this subsection shall be made on the record after an opportunity for a hearing. (f) Additional terms The Secretary of Homeland Security may require such additional terms and conditions in connection with the conveyance as the Secretary considers appropriate to protect the interests of the United States.