Bidding Adif - Presidency Announcement. Object: Drafting Of The Constructive Project And Execution Of The Works For The Renewal Of The Protection Of The Levels At The Pp. Kk. 218/310, 238/333, 273/969, 282/040 And 282/384, And Improve The Protection Of The Level Steps Located In The Pp. Kk. 164/534 And 282/936 Of Line 790 La Asunción Universidad - Aranguren, In The Stretch Of Guase To Balmaseda. File: 3.24/27507.0403.