15 C.F.R. § 400.37
(c) Determinations regarding further review. Within 30 days of receipt of the Executive Secretary's recommendation, the Board members shall provide to the Executive Secretary their determinations on whether further review is warranted concerning all or part of the activity that is the subject of the notification. If either Board member makes a determination that further review is warranted, the activity that is subject to further review (which may constitute all or part of the notified activity) shall not be conducted without authorization pursuant to the application requirements of § 400.23 and the procedural requirements of §§ 400.31-400.34 and 400.36 (or the provisions of paragraph (d) of this section, where applicable). Within 120 days of receipt of the notification, the Executive Secretary shall notify the party that submitted the notification (and the zone grantee, if it did not submit the notification) that: