Mitigation Measures

In terms of environmental protection, the AA will incorporate a number of green elements during the design, construction and operation of the 3RS, and fully comply with the more than 50 conditions listed on the Environmental Permit.

Non-dredge Reclamation

The 3RS project includes the reclamation of around 650 hectares of land north of the existing airport island, of which about 40% is located on contaminated mud pits. To minimise the environmental impact, the AA will use non-dredge methods, such as deep cement mixing (DCM) in those areas.

  • The DCM method is to slowly inject and mix cement slurry into the soft mud inside the contaminated mud pits to form cement clusters which will increase the stiffness of the mud, allowing it to serve as a stable foundation for the 3RS land formation.
  • This method has been used extensively in Japan, South Korea, the United States and Europe with its effectiveness well proven.
  • Two trials have been conducted to test the technique’s feasibility and its potential environmental impact. Trial results showed the technique is suitable for local use. It can also help prevent the release of pollutants into water.
Mitigation Measures

Barges for deep cement mixing

Non-dredge Reclamation

The AA will make every effort to minimise and mitigate the impact on Chinese White Dolphins (CWD). These include:

  • Designating a marine park of about 2,400 hectares to tie in with the full operation of the 3RS for long term conservation of CWD in North Lantau waters.
  • Managing the SkyPier high-speed ferries by:

i) Limiting the traffic at the annual daily level of 99 prior to designation of the proposed marine park;

ii) Diverting the high-speed ferries travelling to/from Zhuhai and Macao away from the proposed marine area;

iii) Restricting the speed of those diverted high-speed ferries to 15 knots or below in high CWD abundance areas.

  • Linking strategically the existing and planned marine parks and Hong Kong International Airport Approach Area.
  • Conducting CWD monitoring to assess the effectiveness of the proposed marine park.
  • Skipper training for safe operation of construction vessels around CWDs.
  • Setting up a Marine Ecology Enhancement Fund for CWDs within the Hong Kong and the Pearl River Estuary waters.
  • Adopting advanced designs and specific construction methods that minimise environmental impact on CWD.
  • Complete avoidance of marine percussive piling and avoidance of piling during the peak calving season for CWD.
  • Supporting research studies on CWD conservation strategy in Pearl River Estuary.
Mitigation Measures

Highlights of Other Key Enhancement and Mitigation Measures

1. Reduce Aircraft Noise under 3RS Operation

  • Whenever practical, the south runway will remain on standby at night to alleviate the aircraft noise impact on North Lantau.
  • Adjust flight paths to avoid populated areas at night.
  • Manage night-time runway directions to minimise noise.


2. Reduce Air Emissions

  • Banned all idling vehicle engines on the airside since 2008.
  • Banned all aircraft at frontal stands from using Auxiliary Power Unit since end 2014.
  • Replace all airside saloon vehicles by electric vehicles (EVs) by mid-2017.
  • Increase the number of charging stations for EVs and electric ground support equipment to 290 by end 2018.
  • The AA and 46 business partners achieved the target of reducing airport-wide carbon intensity by 25% by 2015 from a 2008 baseline. As of end 2015, the airport-wide carbon intensity was reduced by 25.6%. To continue the momentum in reducing carbon across the airport, a new pledge was made to reduce the airport-wide carbon intensity by 10% by 2020, relative to 2015 levels.
Mitigation Measures Mitigation Measures