Bidding Announcement Of: Presidency Of The Miño-Sil Hydrographic Confederation. Object: Service For The Update Of The Integral Renewal Project Of The Background Drains Of The Bárcena Dam. T.M. Of Ponferrada (León). Pdm Miño-Sil Es010_3_Chchercet29Sa2436. File: 102/25/Dt/Pa/Se.