264.310—Closure and post-closure care.
(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:
(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;