Updated on 18 March 2019

1. The geology of this area, belonging to hard granite with no obvious weak zones and faults, suits for construction of large caverns most;
2. In the proximity of the existing Sha Tin Sewage Treatment Works and effluent export tunnel (which transports the treated effluent from the Sha Tin Sewage Treatment Works to Kai Tak River in Wong Tai Sin for discharge), relocating the Sha Tin Sewage Treatment Works to this area will minimize the impact on the upstream sewerage system and the downstream disposal system, thereby minimizing the disturbance to the whole Sha Tin District, reducing the construction and operation costs and shortening the construction period;
3. The majority of the area belongs to government land;
4. The community and environment will be enhanced wholly after relocating the Sha Tin Sewage Treatment Works; and
5. With appropriate measures, the traffic impact near the proposed relocation site arising from the relocation works would be well mitigated.

1. Adopting the advantage of caverns as natural barriers for odour control;
2. Covering up of odour sources;
3. Preventing odour leakage through the access tunnels by applying negative pressure inside caverns;
4. Installing deodourising units to clean up the collected foul air;
5. Discharging exhausted air at height to further enhance the dilution effect; and
6. Enhancing the odour management of the sludge transportation (including adopting sludge carrying vehicles with enclosed containers, cleaning and drying the surface of the sludge carrying vehicles before leaving the caverns, carrying out regular monthly tests for the enclosed containers to ensure proper functioning, etc.).

1. Blasting works will not be commenced in the early stage of the construction, hence the number of construction vehicles is estimated to be low. Construction vehicles will access the temporary construction site and Ma On Shan Road via A Kung Kok Street and access during morning and afternoon peak hours will be avoided;
2. The construction of the temporary steel bridge requires approximately one year, while the preparation works for blasting operation may need approximately one year to complete, and thus aids the transportation of rock materials by construction vehicles.

1. Construction vehicles will transport the excavated rock materials via the temporary construction access connecting Ma On Shan Road, temporary haul road and temporary steel bridge to lower the use of A Kung Kok Street;
2. The Contractor will be required to limit the construction vehicles for transporting the excavated rock materials to access or leave the construction site during morning and afternoon peak hours.

1. Pre-construction survey will be conducted on the nearby buildings and structures and monitoring points will be set up;
2. Hoardings will be erected outside the construction site. Noise barriers and other blasting containment will be installed to reduce noise level and withstand blast pressure;
3. The duration of blasting operations will be short. The blasting operations will be controlled and closely monitored to ensure that the vibration limits are not exceeded; and
4. Liaison office will be set-up near the cavern site to facilitate enquiry from the nearby residents. Liaison office will also regularly send updated blasting schedules to the nearby estates / villages.

1. Moving Bed Biofilm Reactor (MBBR);
2. Aerobic Granular Sludge (AGS);
3. Sulfate Reduction, Autotrophic Denitrification and Nitrification Integrated (SANI^®) Process.