Content of the services entrusted to the contractor: - carrying out the project study - assisting the contracting authority in awarding works contracts - examining compliance with the project and approving execution studies - directing the execution of certain works contracts - scheduling, managing and coordinating works - assisting the contracting authority during acceptance operations; complemented by additional missions: -Support in the management of the operation -Evaluation and optimization of pre-project studies -Inventory of the sanitation - Carrying out geotechnical and hydrogeological studies -Assistance to the operation under site -Assistance to the project owner for the award of contracts relating to the control of the works -Assistance to the project owner for the constraints relating to the various networks -Assistance to the communication of the Contracting authority - Assistance to the DIRCE on its visa, det and AOR missions

The planned developments relate to: - the complete recovery of the road water collection network: about 4 km of concrete pipes to be created mainly along the VRU - 2 pipeline crossings under the VRU to be carried out with a micro-tunnel boring machine - the interception of accidental pollution: 5 storage basins of 200m³, 1 grassy subhorizontal ditch with by-pass on (about 100 ml), - Interception and treatment of chronic pollution: 4 gravel-bed basins planted with macrophytes