expended for associated capital improvements related to a project or program carried out using a grant awarded under this section. (f) Period of availability An amount apportioned under this section may be obligated by the recipient for 2 years after the fiscal year in which the amount is apportioned. Not later than 30 days after the end of the 2-year period, an amount that is not obligated at the end of that period shall be added to the amount that may be apportioned under this section in the following fiscal year. (g) Conditions for operating assistance As a condition of receiving a grant under this section, an eligible recipient shall— (1) in the case of a recipient in an urbanized area— (A) agree to report to the Federal Transit Administration, for inclusion in the National Transit Database— (i) service frequency and revenue vehicle hours, including revenue vehicle hours and unlinked passenger trips originating and terminating in areas of persistent poverty and underserved communities, together with such other specific data as the Secretary shall find necessary and appropriate