Open Tender Procedure Pursuant To Articles 71 And 59, Paragraph 3, Lett. A) Of Legislative Decree No. 36/2023 Relating To The Assignment Of A "Framework Agreement, Of Health Surveillance Activities, Environmental Investigations, Monitoring, Instrumental Exams Pursuant To Legislative Decree 81/08 And Complementary Services For Employees Of Napoli Servizi S.P.A.