The problem of environmental impact has long been addressed by European Countries. Accordingly the European Community Council produced Directive 85/337/CEE of 27th June 1985 (later updated by Directive 97/11/CE of the 3rd March 1997), about the evaluation of the effects in the environment caused by some type of projects. The study of environmental impacts is compulsory for project types listed in Annex I and recommended for project types listed in Annex II of the Directives. From the list of projects mentioned in those Annexes, it may be concluded that some presuppose large construction projects, usually associated with extensive construction sites. Their effect is implicit in the study of the environmental impact of the main project.