regarding a National Scenic Area response activity, 15 days for filing an objection to the response activity, and 15 days for the agency response to the filing of an objection. Upon completion of this process and expiration of the period specified in subsection (d)(1) if applicable, the Secretary shall implement the response activity. (d) Environmental review (1) Expedited environmental assessment Except as provided in paragraph (2), notwithstanding any other provision of law, an environmental assessment prepared by the Secretary concerned pursuant to section 102 of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4332 ) for a National Scenic Area response activity shall be completed within 60 days after the conclusion of the catastrophic event. (2) Categorical exclusion A categorical exclusion is available for any National Scenic Area response activity that— (A) does not exceed 10,000 acres within the National Scenic Area