Section 630.4 - Requirements(a)National Transit Database Reporting System. Each applicant for and beneficiary of Federal financial assistance under 49 U.S.C. chapter 53 must comply with the applicable requirements of 49 U.S.C. 5335 , as set forth in the reference documents.(b)Copies. Copies of reference documents are available from the National Transit Database Web site located at http://www.ntdprogram.gov. These reference documents are subject to periodic revision. Revisions of reference documents will be posted on the National Transit Database Web site and a notice of any significant changes to the reporting requirements specified in these reference documents will be published in the FEDERAL REGISTER. 72 FR 68761 , Dec. 6, 2007, as amended at 81 FR 48970 , July 26, 2016