Section 30.633 - Closure and Post-Closure Care(1) At final closure of the landfill or upon closure of any cell, the owner or operator shall cover the landfill or cell with a final cover designed and constructed to: (a) Provide long-term minimization of migration of liquids through the closed landfill;(b) Function with minimum maintenance;(c) Promote drainage and minimize erosion or abrasion of the cover;(d) Accommodate settling and subsidence so that the cover's integrity is maintained; and(e) Have a permeability less than or equal to the permeability of the bottom liner system.(2) (Effective on and after July 1, 1988) After final closure of the landfill or upon closure of any cell, the owner or operator shall comply with all post-closure requirements set forth in 310 CMR 30.590, including, without limitation, maintenance and monitoring throughout the post-closure care period as specified pursuant to 310 CMR 30.592. The owner or operator shall: (a) Maintain the integrity and effectiveness of the final cover, including making repairs to the cap to correct the effects of settling, subsidence, erosion or other events;(b) Maintain and monitor the leak detection, collection and removal system in compliance with 310 CMR 30.622(3);(c) Continue to operate the leachate collection and removal system;(d) Maintain and monitor the groundwater monitoring system and comply with all other applicable requirements of 310 CMR 30.660;(e) Prevent run-off and run-on from eroding or otherwise damaging the final cover;(f) Maintain access roads in compliance with 310 CMR 30.622(10);(g) Maintain gas collection and control systems, where present; and(h) Protect and maintain surveyed benchmarks used in complying with 310 CMR 30.626.(3) During the post-closure period, if liquid leaks into the leak detection, collection and removal system, the owner or operator shall comply with the provisions of 310 CMR 30.622(3).