European Open Procedure, Pursuant To Art. 71 Of The Legislative Decree. 36/2023, For The Supply Of Material For Water Sampling For Chemical And Microbiological Analyses, In Purchasing Union Between The Ats Of The Metropolitan City Of Milan (Lead), And The Aattss Of Bergamo, Brescia, Brianza, Insubria, Montagna, Pavia And Val Padana, For A Period Of 36 Months With Possible Renewal For A Further 36 Months