Singapore’s Ministry of the Environment has awarded three more contracts worth a total of US$131.5m for the Deep Tunnel Sewerage System (DTSS) project in the island state.
A US$47.4m contract was awarded to a JV consisting of Woh Hup and Shanghai Tunnel Engineering for construction of the 5.9km long, 6m diameter Changi Tunnel and five access shafts. A JV of Kumagai Gumi and Sembcorp was awarded a US$40.5m contract to excavate the 5.1km long, 6m diameter long Paya Lebar Tunnel and four access shafts.
Sembcorp also recently won a US$83m contract for the 12.6km long Kranji Tunnel in JV with Philipp Holzmann.
South Korean contractor Samsung Corporation won the third contract with a tender price of US$43.6m for design and construction of the 7.2km long Ang Mo Kio Tunnel and four access shafts. Last year the first contract, for the excavation of the 7.7km long Bedok Tunnel, was won by Penta Ocean Construction.
These contract awards mean there is now only one more tunnelling contract out of a total of six to be awarded. The remaining contract involves the excavation of a 9.7km long, 3.3m diameter tunnel between Tanglin and Holland Road.
The system of deep tunnels, which range in depth from 20m to 50m, will be used to channel sewage towards two centralised wastewater treatment plants to be built at Changi East and the Jurong Island reclamation. A JV of Parsons Brinckerhoff and CH2M is the project’s consultant.
