Contracting Of Detailed Engineering, Provision Of Materials, Construction, Assembly, Calibration, Testing And Commissioning Of Pressure Regulation Stations (Erp). El Colo And Andacollo. Detailed Engineering, Provision Of Materials, Construction, Assembly, Calibration, Testing And Commissioning Of The El Colo And Andacollo Pressure Regulation Stations (Erp), Intended For The Supply Of Natural Gas To Distribution Networks And/Or Associated Facilities, Under The Regulatory Scope Of Enargas.