1) Correction 2) Rectification 3) Redress 4) Remedy 1) Remedy 
Removal of pollutants from contaminated ground or buildings.
A strategy designed to conquer a deficiency in an employee
The act or process of cleaning up contaminated sites.
1. Cleanup or other methods used to remove or contain a toxic spill or hazardous materials from a Superfund site; 2. for the Asbestos Hazard Emergency Response program, abatement methods including evaluation, repair, enclosure, encapsulation, or removal of greater than 3 linear feet or square feet of asbestos-containing materials from a building. 
Correction or improvement of a problem, such as work that is done to clean up or stop the release of chemicals from a contaminated site. After investigation of a site, remedial work may include removing soil and/or drums, capping the site or collecting and treating the contaminated fluids.