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(a) At final closure of the landfill or upon closure of any cell, the owner or operator must cover the landfill or cell with a final cover designed and constructed to:
(1) Provide long-term minimization of migration of liquids through the closed landfill;
(2) Function with minimum maintenance;
(3) Promote drainage and minimize erosion or abrasion of the cover;
(4) Accommodate settling and subsidence so that the cover's integrity is maintained; and
(5) Have a permeability less than or equal to the permeability of any bottom liner system or natural subsoils present.
(b) After final closure, the owner or operator must comply with all post- closure requirements contained in §264.117 through 264.120 , including maintenance and monitoring throughout the post-closure care period (specified in the permit under §264.117 ). The owner or operator must:
(1) Maintain the integrity and effectiveness of the final cover, including making repairs to the cap as necessary to correct the effects of settling, subsidence, erosion, or other events;
(2) Continue to operate the leachate collection and removal system until leachate is no longer detected;
(3) Maintain and monitor the leak detection system in accordance with §264.301(c)(3)(iv) and (4) and 264.303(c) , and comply with all other applicable leak detection system requirements of this part;
(4) Maintain and monitor the ground-water monitoring system and comply with all other applicable requirements of Subpart F of this part;
(5) Prevent run-on and run-off from eroding or otherwise damaging the final cover; and
(6) Protect and maintain surveyed benchmarks used in complying with §264.309 .