Most environmental infrastructures and industrial facilities are required, despite than their environmental obligations and requirements, to complete environmental audits for subsoil and underground water as well as periodic environmental monitoring programs. An environmental monitoring program may concern: areas where decontamination has already been applied and have changed usage, fields with proven damage that does not cause immediate negative environmental effects, areas with industrial activity characterised as having medium, high or very high environmental risk. The environmental control of subsoil and groundwater, usually concerns industrial sites or sites with similar activities that can cause contamination to the environment, or fields adjacent to a source of pollution It may only concern groundwater but may also include sampling of underground air or soil.