The phrase "remediation work" refers to the actions taken to fix or correct a problem or issue. It involves finding and implementing solutions to resolve a problem and make things better. Full definition
If there's a lot of moisture behind the walls and below the flooring in a finished basement, you could be looking at a lot of costly remediation work. (ratesupermarket.ca)
The Company have been ordered to pay up to $ 3 million to conduct remediation work. (humanrights.gov.au)