; and (ii) the Administrator. (3) Actions against the Administrator (A) Notice to Administrator No action may be brought under subsection (a)(1)(C) unless, not less than 60 days before the date on which the action is brought, the person bringing the action has given notice to the Administrator of the intent to bring the action. (B) Form The Administrator shall prescribe the form in which the notice under subparagraph (A) shall be provided. (c) Costs (1) Attorney and expert witness fees A court, in issuing any final order in an action brought pursuant to this section, may award the costs of litigation (including reasonable attorney and expert witness fees) to the prevailing or substantially prevailing party, as the court determines to be appropriate. (2) Bond A court, in any action brought pursuant to this section in which a temporary restraining order or preliminary injunction is sought, may require the filing of a bond or equivalent security in accordance with the Federal Rules of Civil Procedure. 109. Imminent hazard (a) Authority of the Administrator Notwithstanding any other provision of this title or an amendment made by this title, on receipt of evidence that the use of any perfluoroalkyl or polyfluoroalkyl substance presents an imminent and unreasonable risk of serious or widespread injury to public health or environment, without consideration of costs or other nonrisk factors, the Administrator may issue an order to or bring suit against any manufacturer or user subject to the requirements of this title or an amendment made by this title that is determined by the Administrator to be causing the imminent and unreasonable risk— (1) to restrain that manufacturer or user from that use; (2) to order that manufacturer or user to take such other action as may be necessary