The Valencia Port Authority plans to incorporate a new area of 140,000 m² for the storage of containers. A zone with a 65,000 m² surface in the area has been back filled with about 1,000,000 m³ of dredged mud of a very low consistency. In order to improve the mud, a project has been done that basically consists of: the creation of a soil-cement crust with the mass-stabilization method, the installation of vertical drains, the construction of a horizontal drainage and the placement of a 9.5 m high preload. Afterwards, it has been necessary to wait for around 10-13 months for the mud to consolidate. Later, it will be necessary to remove the preload and to construct the pavement. In order to control this process, a complete monitoring system has been installed. In this paper, the project that is now reaching its final stages is described, as well as the data obtained from the job site and the instrumentation.