Except as provided in this subsection, the President may not commence action under section
9604
(a) of this title or take any action under section
9606 of this title for 120 days after providing notice and information under this subsection with respect to such action. Except as provided in this subsection, the President may not commence a remedial investigation and feasibility study under section
9604
(b) of this title for 90 days after providing notice and information under this subsection with respect to such action. The President may commence any additional studies or investigations authorized under section
9604
(b) of this title, including remedial design, during the negotiation period.