APPROPRIATIONS AUTHORIZED.

SEC. 610. APPROPRIATIONS AUTHORIZED. Within existing budgetary authority and subject to the availability of appropriations, the Secretary is authorized to expend up to $25,000,000, plus such additional amount, if any, as may be required by reason of changes in costs of services of the types involved in the District’s projects as shown by engineering and other relevant indexes to carry out this title. Sums appropriated under this section shall remain available until expended.