Doug,
The citation was published as a special provision.  It's under GPS Chapter 8
(4/1/94).  The statement reads as follows:

"When a grantee reports on the FSR balances of unobligated funds in excess
of 25% of the total amount awarded, or $250,000 whichever is less, the
awarding office GMO shall review the circumstances resulting in such
balances to assure that htese funds are necessary to complete the project."

It goes to say that the GMO has the option to withdraw the unobligated funds
by issuing a revised NOGA etc.etc.  I can fax the text if you're interested.

Rebecca Bacon
Director, Office of Research
Eastern Virginia Medical School
xxxxxx@picard.evms.edu