20 U.S.C. § 1063c: Reporting and audit requirements

the amount and disposition by such recipient of the proceeds of such assistance; the cost of the project or undertaking in connection with which such assistance is given or used; the amount of that portion of the cost of the project or undertaking supplied by other sources; and such other records as will facilitate an effective audit. Any funds paid to an institution and not expended or used for the purposes for which the funds were paid during the five-year period following the date of the initial grant award, may be carried over and expended during the succeeding five-year period, if such funds were obligated for a purpose for which the funds were paid during the five-year period following the date of the initial grant award.