40 CFR 35.6780 - Closeout.
(1) After the completion of all work for a response activity at a site; or
(2) After all activities under a Cooperative Agreement have been completed; or
(3) Upon termination of the Cooperative Agreement.
(c) After closeout, EPA may monitor the recipients' compliance with the assurance to provide all future operation and maintenance as required by CERCLA section 104(c) and addressed in 40 CFR 300.510(c)(1) of the NCP.