Effect on Traffic
We will carry out Traffic Impact Assessment (TIA) in detailed design stage to identify the potential impacts on traffic due to the construction of the works. The data acquired in the TIA will be used in detailed design of the works.
In construction stage, the contractors will be required to submit detailed temporary traffic management schemes using updated traffic counts and on-site trial runs for the works. We will required the temporary traffic management schemes to be approved by the relevant authorities prior to its implementation. It is expected that the traffic impact arising from the works can be kept within acceptable level by implementation of the temporary traffic management schemes during construction.
Besides, at locations where traffic impacts are significant, we will consider to use trenchless / minimum dig techniques to alleviate the traffic impact problems.
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Effect on the Environment
We will undertake an environmental review as part of the detailed design process. In the environmental review noise, air quality, water quality, waste and ecological impacts will be assessed. The assessment criteria will follow all relevant statutory requirements. Findings of the environmental review will be incorporated into the detailed design of the works.
Noise, dust impacts and site run-off are the key environmental concerns. The general approach to the issues are described as follows -
| 1. | Noise |
| We will include the requirements of Noise Control (Construction Work) Regulation into the works contracts to ensure that the statutory guidelines are complied with at all times. Monitoring will be carried out during construction to ensure that the sensitive receivers will not be adversely affected by the noise generated from the works. | |
| 2. | Dust |
| We will include the requirements of Air Pollution Control (Construction Dust) Regulation and "Recommended Pollution Control Requirements for Construction Contracts" issued by Environmental Protection Department into the works contracts to ensure that the statutory guidelines are complied with at all times. | |
| 3. | Site Run-off |
| All site run-off generated from the construction works will be treated in accordance with the Water Pollution Control Ordinance before discharge into the drainage systems to avoid contamination. | |
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Effect on Consumers
Replacement and rehabilitation of water mains may lead to inconvenience to the general public due to the construction works. Apart from the inconvenience caused by the works, water supply to consumers will be also affected as the works will involve the disconnections from of the old pipelines and the making of new connections to the new pipelines.
In order to minimise the disruption of water supply to consumers, we will endeavour to keep the number of water supply suspensions and the period of each water supply suspension to a minimum by suitable planning of the works in detailed design and construction of the works. In any case, we will limit the period of water supply suspension to within 8 hours.