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COWI partnership wins DTSS Phase 2 contract

Leighton Asia has awarded COWI, in partnership with CPG Corporation, a contract for the design of Phase 2 of the Singapore Public Utilities Board (PUB) Deep Tunnel Sewerage System (DTSS).

The scope of the contract includes the design of a 6 m diameter, 7.9 km section of sewer tunnel, shafts, hydraulic structures and other associated facilities at a key central section of the tunnel in the Pandan Gardens area.

The project is a US$7.3 billion project designed to meet Singapore’s water collection, treatment, reclamation and disposal needs, by extending the existing deep tunnel system to carry wastewater from western and southern areas to central water reclamation plants.

Phase 1 of the project was completed in 2008, with PUB awarding a US$372 million tunnelling package contract to Leighton Asia in September 2017.

Phase 2 will include the construction of 40 km of deep tunnel sewer stretching across the western part of Singapore, starting 35 m below ground and following the Ayer Rajah Expressway to Tuas Road, 55 m below ground.

The tunnels will be lined with microbiological-influenced corrosion (MIC) resistant concrete and high-density polyethylene (HDPE) to prevent corrosion.

Fibre optic cables will also be embedded into the lining to remotely monitor the tunnels’ structural integrity.

“This is a hugely significant contract for COWI,” said COWI Executive Director for Tunnelling UK and South East Asia Andy Sloan.

“We are extremely pleased to be working with Leighton on this technically challenging project.

“The win sees us expanding from our base in Hong Kong into the Singapore market where we feel we can bring great value to contractors and clients alike.”

For more information visit the COWI website.

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