38 U.S.C. § 313
Availability of appropriations
(a)
Funds appropriated to the Department may remain available until expended.
(b)
Funds appropriated to the Department may not be used for a settlement of more than $1,000,000 on a construction contract unless—
(1)
the settlement is audited by an entity outside the Department for reasonableness and appropriateness of expenditures; and
(2)
the settlement is provided for specifically in an appropriation law.
(Added Pub. L. 102–83, § 2(a) , Aug. 6, 1991 , 105 Stat. 383 .)