Cause of Impact
The main sources of air quality impact during construction of the Aberdeen Channel Bridge are the increased levels of dust due to:
- Construction of the viaduct sections and piers;
- Construction of Aberdeen Channel Bridge;
- Wind erosion of open active areas;
- Material handling and temporary stockpiles;
- Spoil transportation; and
- Slope stabilization works.
Similar to other existing electrified railways in Hong Kong, the air quality impact of railway operations is insignificant.
In order to minimize dust levels during construction, the following remedies will be applied:
- Using solid-fabric waterproof materials to cover all stockpile areas;
- Regular water spraying on all the potentially dusty areas on site;
- Spraying all dusty materials with water immediately prior to any loading or transfer operation;
- Completely covering dusty materials on construction trucks with solid fabric;
- Washing vehicle wheels prior to leaving the construction site;
- Limiting the number of construction trucks approaching and leaving the site;
- Controlling the speed of trucks within the works site to about 10km/h; and
- Conducting regular site audits to ensure that the dust control measures are properly implemented.
Careful application of all the various remedies described above will result in dust levels from the construction of Aberdeen Channel Bridge complying with all requirements of legislative criteria and guidelines.