2. Example of Renault's Boulogne-Billancourt site

The Renault site in Boulogne was rehabilitated under the terms of prefectoral decrees as part of the cessation of classified activities linked to the automotive industry and carried out in this area since the beginning of the last century. Most of the site was put up for sale and converted into offices and housing, with a few establishments open to the public.

The site covers some 50 ha (including Ile Seguin), and its redevelopment has been divided into lots and spread over ten years or so, depending on the schedule for releasing each lot.

• Hydrogeological context

  The site is located on a shallow alluvial groundwater table (between 5 and 10 m), underlain by three superimposed layers of soil with very different hydraulic properties: modern clayey fill/alluvium, ancient sandy-gravelly alluvium...