English to Spanish Other Environment & Ecology Problema ambiental

Context: the term appears on a list, without definition:

Seven Core Environmental Aspects:
 Accidental Releases
 Wastewater
 Water
 GHG Emissions and Energy use
 Legacy sites
 Air Emissions
 Natural Resources

Type of document: PowerPoint for employees
Target language: Latin American Spanish

[I have found a definition, but I'm not sure it is the right one:
Legacy sites are those which have hazards to be managed after the initial phases of nuclear technology development, for example, sites where uranium was produced, or sites that had facilities for research, development (R&D) and experimentation]