action was taken by any Party to the Protocol, the following procedures shall be followed: (1) The Director, after notice and opportunity for a hearing in accordance with subsection (l)(ii), shall assess the cost of the response action that should have been taken and may assess the reasonable costs incurred by the United States under this subsection to determine that cost. The Director is authorized to promulgate regulations to implement this subsection. (2) Hearings for the assessment of the costs under subsection (l)(i) shall be conducted in accordance with section 554 of title 5, United States Code. For the purposes of conducting any such hearing, the Director may issue subpoenas for the attendance and testimony of witnesses and the production of relevant papers, books, and documents, and may administer oaths. Witnesses summoned shall be paid the same fees and mileage that are paid to witnesses in the courts of the United States. In case of contumacy or refusal to obey a subpoena served upon any person pursuant to this subsection, the district court of the United States for any district in which such person is found, resides, or transacts business, upon application by the United States and after notice to such person, shall have jurisdiction to issue an order requiring such person to appear and give testimony before the Director or to appear and produce documents before the Director and any failure to obey such order of the court may be punished by such court as a contempt thereof. (3) Response action costs assessed pursuant to this section shall reflect, as much as possible, the costs of the response action that should have been taken and the maximum recovery amount of those costs shall be as set forth in subsection (g). Further, the assessment of response action costs pursuant to this section shall not be deemed to preclude the assessment of additional civil or criminal penalties for violations of any other provision of this Chapter or any other law. (4) At the request of the Director, and with the