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Adverse water quality impact was not predicted during the construction and operation phase of the Project. Nevertheless, a marine water quality monitoring and audit programme is recommended during marine construction works to verify whether or not impact predictions are representative, and to ensure that the dredging works along the alignment of the proposed submarine gas pipelines do not result in unacceptable impacts. If monitoring shows unacceptable water quality impact, appropriate mitigation measures, such as changes in the operation of dredging works shall be introduced.
Details of the water quality monitoring and audit programme and the Event and Action Plan are provided in the EM&A Manual. Water quality monitoring will be carried out at selected potentially affected sensitive receivers. The Manual includes site-specific monitoring and auditing protocols for baseline and impact monitoring of marine water quality. Such protocols include but are not limited to the locations of monitoring stations, parameters and frequencies for monitoring, monitoring equipment, and reporting of monitoring results.
It is recommended that auditing of each waste stream shall be carried out periodically to determine if wastes are being managed in accordance with approved procedures and the site waste management plan. The audits shall look at all aspects of waste management including waste generation, storage, recycling, treatment, transport and disposal. An appropriate audit programme will be to undertake a first audit at the commencement of the construction works, and to audit weekly thereafter.
The placement of the second silt curtain at
To Kwa Wan breakwaters described in the Report shall be subject to regular
audit. Following implementation of the second silt curtain, the health and
condition of the hard coral communities on the To Kwa Wan breakwaters potentially
affected by the proposed works shall be monitored. The details of monitoring and
audit programme are discussed in the EM&A manual.
The implementation of the water quality mitigation measures stated in Section 3.8 shall be checked as part of the environmental monitoring and audit procedures during the construction period as presented in the Environmental Monitoring and Audit Manual. No other fisheries-specific measures are considered necessary.
The implementation of hazard to life mitigation measures stated in Section 7.6 shall be checked as part of the environmental monitoring and audit procedures during the construction period.
The implementation of landscape mitigation measures stated in Section 8.5 shall be checked as part of the environmental monitoring and audit procedures. Environmental Team shall check the implementation of the landscape mitigations recommended in the EIA report.
It is recommended that a monitoring brief shall be conducted during dredging at the locations where there is no geophysical survey due to ‘gas masking’ This can be carried out at the same time as the monitoring of barge loading.
Given the results from the impact predicted during the construction phase, the construction noise impact can be mitigated to acceptable level. Nevertheless, to ensure that the nearby NSRs will not be subjected to unacceptable construction noise impact, an Environmental Monitoring and Audit (EM&A) programme is recommended. The details on monitoring and audit programme are discussed in the EM&A Manual.
It is necessary to ensure proper implementation of the dust
control measures as required under the Air Pollution Control (Construction
Dust) Regulation. As the dredged mud is
in high moisture content during the dredging process and the number of plant
operated on landmain site is limited, no significant dust impact is
anticipated, hence no specific construction dust monitoring is recommended,
although environmental audits during the construction stage will be desirable
to ensure proper implementation of air quality control measures.