the missions of external controls of the concrete works, engineering structures and metal structure carried out as part of the work of lots No. 2 and No. 3 of the contract of "clearance of rights-of-way, realization of preloading, realization of the roundabout RD 86, structures Oa3, Oa4, Oa6 and the construction of the viaduct on the Drôme ". Lot No. 2 concerns the construction of current engineering structures Oa3, Oa4, Oa6, and associated restorations. Lot 3 concerns the construction of the viaduct over the Drôme

the services concern the realization of external controls of concrete, engineering structures and metal structure works carried out as part of the work of lots No. 2 and No. 3 of the contract for "clearance of rights-of-way, realization of preloads, realization of the roundabout RD 86, Oa3, Oa4, Oa6 and the construction of the viaduct on the Drôme". Lot No. 2 concerns the construction of current engineering structures Oa3, Oa4, Oa6, and associated restorations. Lot 3 concerns the construction of the viaduct over the Drôme