the procurement procedure used is: the open call for tenders. It is subject to the provisions of Articles L. 2124-2, R. 2124-2 1° and R. 2161-2 to R. 2161-5 of the Public Procurement Code. The work concerns in particular the carrying out of cleaning work of structures that are not easily accessible and/or confined, completed for the upstream mask with a survey of cracks and disorders, transplanting of the buttress and the parapet with restoration, completed by an examination of the parapet and the buttress type feroscan and survey of the dimensions, construction and implementation of a cofferdam, implementation of measures to prevent pollution by the Mes, installation of nets dedicated to the control of the entry of chiroptera into galleries

the procurement procedure used is: the open call for tenders. It is subject to the provisions of Articles L. 2124-2, R. 2124-2 1° and R. 2161-2 to R. 2161-5 of the Public Procurement Code. The work concerns in particular the carrying out of cleaning work of structures that are not easily accessible and/or confined, completed for the upstream mask with a survey of cracks and disorders, transplanting of the buttress and the parapet with restoration, completed by an examination of the parapet and the buttress type feroscan and survey of the dimensions, construction and implementation of a cofferdam, implementation of measures to prevent pollution by the Mes, installation of nets dedicated to the control of the entry of chiroptera into galleries