Excavation, Placement And Rock Service, For The Foundation Of The Wall - Section 02, Section 04, Section 07, Section 08 (Right Margin And Left Bank) At Full Cost. - Hiring Of The Excavation, Placement And Accommodation Of Rock, For The Foundation Of The Wall - Section 02, Section 04, Section 07, Section 08 (Right Bank And Left Bank) At All Costs For The Work: Improvement Of The Risk Protection And Management Service Against Flooding At 3,240 Km