4.1.1.1
With proper mitigation measures in place as recommended in the EIA
report, adverse water quality would not be anticipated to the Water Sensitive
Receivers (WSRs) as shown in Figure 4.1 during the construction and
operational phases of this Project.
Therefore, while water quality monitoring is not recommended, regular
audit and inspections of construction activities and works sites and works
areas should be conducted to ensure that the recommended mitigation measures
are properly implemented.
4.1.1.2
The study area for the water
quality impact assessment is delineated within 300m from the proposed Trunk Road T2 alignment site
boundary and barging point (Figure 4.1), which would cover the relevant existing and potential water
sensitive receivers (WSRs) as shown in Table 4.1 below and that would have a bearing on the environmental acceptability of
the project. Due to the highly urbanised
nature of
Table 4.1 Relevant Water Sensitive Receivers
|
Water
Sensitive Receivers (WSRs) |
Distance
from Project Boundary (m) |
|
|
WSR 1 |
Yau Tong WSD |
890 |
|
WSR 2 |
Cha Kwo Ling WSD |
74 |
|
WSR 3 |
Sai Wan Ho WSD |
1241 |
|
WSR 4 |
|
1231 |
|
WSR 5 |
Cooling Water Intake for |
170 |
|
WSR 6 |
Kwun Tong
Typhoon Shelter |
335 |
|
WSR 7 |
To Kwa Wan
Typhoon Shelter |
630 |
|
WSR 8 |
Tai Wan WSD |
1870 |
|
WSR 11 |
Cooling Water Intake for Kai Tak DCS |
223 |
|
WSR 12 |
North Point WSD |
2167 |
|
WSR 13 |
Provident Centre Cooling Water Intake |
2337 |
|
WSR 14 |
|
2551 |
|
WSR 15 |
|
1343 |
|
WSR 16 |
|
1337 |
|
WSR 17 |
Shau Kai Wan
Typhoon Shelter |
1455 |
Notes *: WSR Nos. 9 and 10 are not used
4.1.1.3 WSR2 and WSR6 are the only sensitive receivers located within the 300m Study Area for the water quality assessment. While WSRs 5, 7 and 11 are at an intermediate distance, within 650m of the Trunk Road T2 project boundary, the remaining WSRs are located along the coastline of Hong Kong Island and are distant from the project.
4.2.1.1
The recommended mitigation measures for water quality impacts are
presented the EMIS in Appendix A of this
EM&A Manual. In the event of
complaints or non-compliances, the ET, Engineer and Contractor should review
the effectiveness of these mitigation measures, design alternatives or
additional mitigation measures as appropriate.
The Contractor should propose the corrective action to the Engineer for
approval, and implement them accordingly.
4.3.1.1
No water quality monitoring would be required during the construction
phase. To avoid any potential water
quality impacts arising from the construction activities, regular site audits
should be conducted to ensure the recommended mitigation measures are properly
implemented.
4.3.1.2
The implementation of regular site audits aims to ensure the mitigation
measures recommended in the EIA report are properly undertaken during the
construction phase of this Project. It
can, also, provide an effective control of any mal-practices and, therefore,
achieve the continual improvement of the environmental performance
on-site. Site audits should include both
site inspections and compliance audits.
4.3.1.3
Inspections of the construction activities and works sites and works
areas should be conducted by the Contractor at least on a weekly basis to
ensure the mitigation measures to be properly implemented.
4.3.1.4
Site audits should be carried out by the Engineer, ET and Contractor,
and should be based on the mitigation measures for the water pollution control
as recommended in Appendix A of this
EM&A Manual. In the event that the recommended mitigation measures are not
fully or properly implemented, the Contractor should report the deficiency to
the Engineer and ET. The following
appropriate action will need to be taken by the Contractor:
l
Investigate the problems and causes;
l
Discuss a remedial and corrective proposal with the ER and ET;
l
Take action according to the action notes agreed with the ER;
l
Implement the remedial and corrective action immediately;
l
Re-inspect the site conditions upon the completion of the remedial and
corrective action; and
l
Record the event.
4.3.1.5
Compliance audits are to be undertaken by the Engineer and ET and
escorted by the Contractor to ensure that a valid discharge license has been
issued by the EPD prior to the discharge of the effluent from the construction
activities of this Project site.
Monitoring of the quality of the treated effluent from the works areas
should be carried out in accordance with the Water Pollution Control Ordinance
(WPCO) license. The audit results
reflect whether the effluent quality is in compliance with the discharge
license requirements. In case of
non-compliances, the following action should be taken:
l
The Contractor should notify the Engineer, ET and IEC;
l
The Engineer, ET and IEC should identify the sources of pollution and
recommend and agree the appropriate mitigation measures for the Contractor;
l
The Engineer and ET should check the implementation status of the agreed
mitigation measures by the Contractor;
l
The ET should increase the monitoring frequency until the effluent
quality is in compliance with the requirements of the discharge license; and
l
The ET should record the non-compliances and propose preventive
measures.
4.3.2.1 No adverse water quality impact would be anticipated during the operational phase, provided that all mitigation measures recommended in the EIA report are properly implemented. Therefore, water quality monitoring and auditing are not required during the operational phase.