PUB TWRP Contract 1 comprises of a construction of 6m internal diameter tunnel from the proposed Tuas Water Reclamation Plant (TWRP) / Tuas NEWater Factory to existing network in Jurong Island, construction of tunnel launching and receiving shafts and the installation of twin 2200mm and 1200mm diameter pipelines within the tunnel, pipelaying by cut and cover method, installation of pipeline appurtenances and construction of associated chambers.