36 C.F.R. § 1600.24
(c) Adverse determinations of requests for access. If the Foundation makes an adverse determination denying your request for access in any respect, it will notify you of that determination in writing. Adverse determinations, or denials of requests, consist of: a determination to withhold any requested record in whole or in part; a determination that a requested record does not exist or cannot be located; a determination that what has been requested is not a record subject to the Privacy Act; a determination on any disputed fee matter; and a denial of a request for expedited treatment. The notification letter shall be signed by the General Counsel, or his/her designee, and shall include: