Contract awarded for Harbour Area Treatment Scheme Stage 2A

A $680 million contract for the construction of an effluent tunnel and disinfection facilities has been awarded by the Drainage Services Department.

According to Mr Chan Chi-chiu, Director of Drainage Services, this is the 10th major works contract awarded under the Harbour Area Treatment Scheme Stage 2A.
 
"The contract, comprising mainly the construction of an 880-metre-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 to an existing outfall drop shaft and provide sufficient retention time for disinfection. The effluent tunnel will 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. The drill and blast method, which is a more reliable construction method at such depth, will be adopted for the tunnel construction," Mr Chan said.