Posted July 2010


Cause of Impact

Construction

The potential source of noise impact during construction phase would mainly be the use of powered mechanical equipment (PME) for various construction activities. Ground-borne noise impact could arise from hydraulic breakers, pipe pile rigs and drilling rigs for tunneling works.

Operation

Air-borne noise impact would arise from ventilation facilities and cooling tower. Ground-borne noise impact would arise from trains running on tracks inside tunnels.

Proposed Remedies

Construction

In order to minimize ground-borne noise impacts during the construction phase, the following remedies will be applied:

  • Use of quiet PME; Generator
  • Using noise barriers or enclosures;
  • Using acoustic fabric for piling and drilling machines; Noise insulating fabric
  • Using silencers and mufflers for ventilation fans; Ventilation fan
  • Positioning and orientating noisy PME away from sensitive receivers as far as possible; and
  • Shutting down or throttling down noisy PME to minimum between works periods.

Operation

In order to minimise air-borne and ground-borne noise impacts during the operation phase, the following remedies will be applied:

  • Orienting fixed plant / louvers away from sensitive receivers where possible;
  • Adopting silencers, acoustic louvers and acoustic enclosures where necessary;
  • Choosing quieter fixed plant and ensuring the maximum permissible sound levels can be met; and
  • Installing vibration mitigating trackform.

Results

Results indicate that even with implementation of mitigation measures to reduce the construction noise impacts, there would still be exceedances of the noise criteria stipulated in the EIAO-TM at some of the sensitive receiver (click here to see the results). All remedies described above shall be exhausted to keep the residual impacts to a minimum.

For operation phase, the noise levels from fixed plant and railway operation would fully comply with the noise criteria stipulated in the EIAO-TM and Noise Control Ordinance.

Disclaimer: The Technical Circular (ETWB TCW No. 13/2003) guides the parallel actions on gazetting and EIA process for the project. In handling any EIA-related inconsistencies that may arise due to amendments to the gazetted scheme, MTR Corporation would follow the guidelines and requirements of Section 13 and Section 10 (1) of the EIAO in the EIA processing.