The Drainage Services Department signed a $199 million contract with the Contractor Sequence Construction Company Limited on 18 December 2013 for construction of village sewers in Lamma Islands to extend village sewerage to 13 unsewered villages/areas at Yung Shue Wan and to implement sewerage works improving the environmental hygiene in unsewered villages.

The Contract comprises mainly construction of about 9.1 km of sewers for 13 unsewered areas in Yung Shue Wan of Lamma Island, namely Sha Po New Village, Sha Po Old Village, Yung Shue Wan Back Street, Tai Shan West, Tai Shan East, Tai Shan Central, Ko Long (Part), Tai Yuen Village (Part), O Tsai, Po Wah Yuen, Yung Shue Long New Village, Yung Shue Long Old Village and Tai Peng; construction of a sewage pumping station (SPS) at O Tsai with associated twin rising mains. The contract is scheduled for completion in mid-2018.