40 CFR 1850.9: Maintenance of files.

The Records Management Officer shall maintain files containing all material required to be retained by or furnished to them under this subpart. The Council shall preserve all correspondence pertaining to the FOIA requests that it receives, as well as copies of all requested records, until a General Records Schedule (GRS) published by the National Archives and Records Administration (NARA) or another NARA-approved records schedule authorizes the office to dispose of or destroy the records. All materials identified as responsive to a FOIA request will be retained while the request or a related appeal or lawsuit is pending even otherwise authorized for disposal or destruction under a GRS or other NARA-approved records schedule. The material shall be filed by a unique tracking number.