extraordinary maintenance of instrumental network infrastructures: replacement of aqueduct networks (lot 1), sewerage and sewage systems (lot 2)
extraordinary maintenance of instrumental network infrastructures: interventions to replace the aqueduct networksextraordinary maintenance of instrumental network infrastructures: interventions to replace the aqueduct networks (lot 1)
extraordinary maintenance of instrumental network infrastructures: sewer and sewerage replacement interventions (lot 2)extraordinary maintenance of instrumental network infrastructures: sewer and sewerage replacement interventions (lot 2)