Contract awarded for Harbour Area Treatment Scheme Stage 2A
11 August 2011
The Drainage Services Department (DSD) today (August 11) awarded a $680 million contract for the construction of an effluent tunnel and disinfection facilities.
Speaking after the contract signing ceremony, the Director of Drainage Services, Mr Chan Chi-chiu said that this is the 10th major works contract awarded under the Harbour Area Treatment Scheme (HATS) Stage 2A.
“The contract, comprising mainly the construction of an 880m long effluent tunnel with an internal diameter of 8.5m and disinfection facilities at the Stonecutters Island, is scheduled for completion in early 2015. The tunnel serves to convey the treated effluent from the Stonecutters Island Sewage Treatment Works (SCISTW) to an existing outfall drop shaft and provide sufficient retention time for disinfection. The effluent tunnel would be constructed in a rock layer at a depth of 90m such that it would not constrain the development potential of the land above the effluent tunnel. Drill and blast method, which is a more reliable construction method at such depth, will be adopted for the tunnel construction” Mr Chan said.
HATS is a major sewerage infrastructure project in Hong Kong to improve the water quality of Victoria Harbour. The commissioning of HATS Stage 1 in late 2001 has provided proper treatment to about 75% of the sewage discharged into Victoria Harbour, and has significantly improved the water quality in the eastern and central parts of the harbour. HATS Stage 2A will collect the remaining 25% of the sewage generated from northern and southwestern parts of Hong Kong Island. The scope of HATS Stage 2A comprises the construction of approximately 21 km of sewage tunnels as well as the expansion and upgrading of the SCISTW and related preliminary treatment works on Hong Kong Island. Construction of HATS Stage 2A works has commenced since July 2009 and is progressing satisfactorily.
Mr. Chan Chi-chiu, the Director of Drainage Services (second right) attended the Contract Signing Ceremony