The purpose of this framework agreement is to carry out data acquisition missions (topographies, geotechnical surveys and built diagnostics). The Société du Grand Paris will specify in each subsequent contract the extent of its needs and the areas to which they relate. The need covers the entire national territory

The object of lot 1 is topographical services necessary for the realization of linear transport projects in particular. The purpose of the services is the topographic survey or the survey requiring the expertise of a surveyor of "Target Areas" located on the route, which the SGP will notify as and when its needs. These "Target Areas" will be mainly located at the level of overhead structures, the emergence and insertion of structures such as stations, maintenance sites and ancillary structures as well as singular areas where interaction with the surrounding area is identified.

The purpose of lot 2 is to carry out geological and geotechnical reconnaissance work and hydrogeological monitoring. These services will mainly be carried out as part of preliminary geotechnical studies or geotechnical design studies (within the meaning of standard NF P 94-500) for linear transport projects in particular. This reconnaissance work is led by the SGP or its representative. Pyrotechnic drilling security missions are to be expected in areas identified as pyrotechnic risk

The purpose of lot 3 is to carry out surveys of the sensitivity and vulnerability of the buildings necessary for the realization of linear transport projects in particular and to recognize the obstacles buried on the project route. The missions described below aim to feed studies such as preliminary studies and design in particular and consist of: - carrying out a global study, mapped, of the entire section vis-à-vis the sensitivity of the building to deformations and vibrations; - Carry out a documentary search on the buildings in the areas according to the sensitivity established in the previous phase. - carry out studies of the particular sensitivity and vulnerability of buildings (with regard to deformations and vibrations in particular), based on field surveys