In the context of the Antwerp Masterplan, the historic quay walls in Antwerp must be stabilized. In order to draw up the geotechnical dossier, all available geological and geotechnical data were collected. Use was also made of the Subsoil Database Flanders Service (DOV). Based on the archived data, a comprehensive program was prepared for in situ tests, laboratory testing and monitoring in the field. Analysis of the obtained data was used to establish and characterize the ground layer structure. The extensive research resulted in an economic design of the stabilization method.