Harbour Area Treatment Scheme

The HATS Phase 2 projects were designed to collect HK island’s sewage and transport it to a newly upgraded sewage treatment plant.

Year: 2012

Country: Hong Kong

Contract Value (US$): 330 Million

7.5km drill and blast tunnels 100m below ground along HK Island’s West Coastline. Tunnels lined with concrete to form two large diameter sewerage pipes and connect to Stonecutter’s Island sewage treatment plant. Five vertical shafts with a depth of up to 130m to connect the old sewage system to the new.

Andreas Tauschinger was Leighton Asia’s Tunnel Operations Manager responsible for this tunnelling project through high water inflows, which were effectively controlled using systematic Pre-Excavation-Grouting (PEG). This section of tunnel was successfully completed in early 2015 to the full satisfaction of the Drainage Services Department of HK.