Definitions for terms that appear throughout this subchapter may be found in Subchapter A of this chapter (relating to General Financial Assurance Requirements) and Chapter 350 of this title (relating to Risk Reduction Program Rule), except where the following terms are used in this subchapter, the following definitions shall apply.(1) Post-response action care - This term shall be used interchangeably with closure.(2) Post-response action care estimate - The most recent written cost estimate for post-response action care for an affected property as required by §350.33(l) and (m) of this title (relating to Remedy Standard B) and approved by the executive director. For purposes of this subchapter, it shall be mean the same as "current cost estimate."(3) Response action plan - The same as "closure plan."