49 CFR 801.23 - Extension.
In unusual circumstances as specified in this section, the time limits prescribed in either § 801.21 or § 801.22, may be extended by written notice to the person making a request and setting forth the reasons for such extension and the date on which a determination is expected to be dispatched. Such notice will not specify a date that would result in an extension for more than 10 working days. As used in this paragraph, “unusual circumstances,” as they relate to any delay that is reasonably necessary to the proper processing of the particular request, means -
(a) The need to search for and collect the requested records from field facilities or other establishments;
(b) The need to search for, collect, and appropriately examine and process a voluminous amount of records which are the subject of a single request; or
(c) The need to consult with another agency that has a substantial interest in the disposition of the request or with two or more components of the agency having substantial subject-matter interest therein.