; and (ii) in accordance with the applicable schedule established by the lead agency; (B) submit to the lead agency progress reports not less frequently than once every 90 days; and (C) formulate and implement a plan for administrative, policy, and procedural mechanisms to enable the agency to ensure completion of the agency action for the Federal authorization in accordance with an applicable schedule established by the Commission under section 15(c)(1) of the Natural Gas Act ( 15 U.S.C. 717n(c)(1) ). (d) Modifications to, and failures To meet, deadlines (1) In general In any case in which an agency (including the lead agency) modifies or fails to meet a deadline required with respect to an agency action for a Federal authorization for a project under the applicable schedule established by the Commission under section 15(c)(1) of the Natural Gas Act ( 15 U.S.C. 717n(c)(1) ), the head of the agency (including, in the case of a failure by a State agency, the head of the appropriate Federal agency) shall, by not later than 15 days after the applicable deadline, provide a notice of the modification or failure to— (A) the appropriate committees of Congress; (B) the lead agency (if applicable); (C) the Director of the Office of Management and Budget