European Tender For Open Procedure Pursuant To Art. 71 Of Legislative Decree 36/2023 For The Assignment Of A Complex Integrated Framework Agreement, In A Single Lot And With A Single Economic Operator, Concerning The Executive Design And The Execution Of The Works Relating To The Interventions For The Consolidation, Rehabilitation And Waterproofing Of The Accumulation Tanks Of The A.P. Of The Sii