(1) “Corrective action” means an activity, including restoring the integrity or establishing the adequacy of a damaged or inadequate containment structure or environmental monitoring or control system, to: bring a landfill into compliance with the applicable requirements, prevent a reasonably foreseeable release, or remediate a known release to the environment. Corrective action does not include routine maintenance.

(2) “Causal event” means an occurrence that could result in a non-water release corrective action. Causal events include, but are not limited to, earthquakes, flooding, tsunami, seiche, fire, precipitation, and degradation of or otherwise inadequate containment structure or environmental monitoring or control system.