Table 6.2 Event/Action Plan for Underwater Noise Monitoring

Event

Action

ET Leader

IEC

Contractor

Action level triggered

1. Inform the IEC, ER and Contractor;

2. Advise Contractor of dolphin protection zone coverage.

3. Continue to monitor underwater noise level.

1. Check monitoring data submitted by ET.

1. Inform Contractor.

1. Review the piling sequence or method;

2. Implement the mitigation measure to lower the underwater noise level to below action limit within 30 minutes;

3. Implement protection zone.

4. Closely liaise with the ET on the progress.

Limit level triggered

1. Instruct the Contractor to stop construction work;

2. Inform the IEC and ER;

3. Discuss with IEC, ER and Contractor on noise reduction proposal;

4. Assess effectiveness of Contractor’s proposal and keep IEC and ER informed.

1. Check monitoring data submitted by ET.

2. Discuss amongst ER, ET and Contractor on the potential remedial actions.

1. Review the proposal by Contractor;

2. Make agreement on the measures to be implemented.

1. Stop construction work

2. Inform the ER

3. Review the piling sequence or method in order to reduce the underwater noise levels to no higher than 170 dB.

4. Submit noise reduction proposal to the ER for endorsement.

5. Implement the agreed measures.

6. Re-submit proposals if problem still not under control;

7. Stop the relevant portion of works as determined by the ER until the exceedance is abated