TABLE OF
CONTENTs
TABLES
Table
12.1 Summary
of Key Environmental Outcomes and Benefits
APPENDICES
Appendix
12.1 Key
Assessment Assumptions and Limitation of Assessment Methodologies
Appendix
12.2 Summary
of Environmental Impact
¡P
Air Quality Impact;
¡P
Noise Impact;
¡P
Water Quality Impact;
¡P
Waste Management Implications;
¡P
Marine Ecological Impact;
¡P
Landscape and Visual Impacts; and
¡P
Impact of Cultural Heritage.
Table 12.1 Summary
of Key Environmental Outcomes and Benefits
|
Environmental / Social Benefits of the Project |
¡P The
Project is designed to provide a seamless and hassle-free connection between
the ITT of HKIA and HKBCF Island to facilitate the intermodal modal travel of
air passengers, in line with and further strengthening HKIA¡¦s strategic
positioning and function as an international aviation hub in the region. ¡P The
Project incorporates environmental protection measures such as 100% adoption
of electric vehicles and associated charging facilities in the ITT. |
|
Environmentally
Friendly Design and Options |
¡P Avoidance
of use diesel bonded vehicle. ¡P Avoidance
of open sea dredging. ¡P Avoidance
of direct impact on the intertidal habitats. ¡P Adoption
of environmental friendly construction method. ¡P Avoidance
of illegal dumping. ¡P Implementation
of Environmental Monitoring and Auditing System. |
|
Air
Quality Impact |
Construction
Phase: ¡P Potential dust impact generated
from construction activities, such as site clearance, minor excavation with
limited backfilling, and wind erosion of exposed area, and emission from PMEs
would not be significant. With
implementation of suitable practice and mitigation measures, potential
impacts on nearby ASRs in the vicinity of the Project would not be
significant and would be controlled to within relevant standards. Operation
Phase: ¡P As 100% electric vehicles will
be used, there will be no air pollutants emission during the operation of the
Project, adverse air quality impact is not anticipated. Therefore, no mitigation measure will
be required during the operation phase. |
|
Noise
Impact |
¡P
As
no existing and planned NSRs which rely on opened windows for ventilation is
identified within the assessment area, no adverse noise impact will be
generated from the construction and operation of the Project. |
|
Water
Quality Impact |
Construction
Phase: ¡P
No
open sea dredging will be involved for construction of the Bonded Vehicular
Bridge. Sediment excavation will
only be carried out in a confined dry working environment. With implementation of mitigation
measures including installation of steel pile casing and watertight cofferdam
at the pier site, provision of appropriate desilting or sedimentation device
for treatment of water from dewatering process, deployment of silt curtains,
and use of suitable size of vessels for marine construction works, no adverse
water quality impact is expected due to marine construction of the Bonded
Vehicular Bridge. ¡P
Potential
water quality impacts from the land-based construction works are associated
with the general construction activities, construction site run-off,
accidental spillage, and sewage effluent from construction workforce. With implementation of site practices
as outlined in ProPECC Note PN 1/94, no adverse water quality impact is
expected due to the land-based construction works. Operation
Phase: ¡P
Potential
hydrodynamic impact due to the presence of the marine bridge piles of the
Bonded Vehicular Bridge has been identified and assessed with the use of
computational modelling approach.
The model results showed that the change in current velocity would be
small and localised at the sea channel between HKIA and HKBCF Island. No significant change in flow regime
at the sea channel is anticipated.
The predicted change in momentary flow and accumulated flow would also
be minor, significant change in flushing capacity is not anticipated. No adverse hydrodynamic impact would
therefore be expected. |
|
Waste
Management Implications |
Construction
Phase: ¡P
Waste
types generated by the construction of this Project are likely to include
C&D materials, chemical waste from maintenance of construction plant and
equipment, general refuse, excavated sediment, and potential floating refuse. Provided that these wastes are
handled, transported and disposed of according to the recommended good site
practices, adverse environmental impacts are not expected. ¡P
The
excavated sediment generated from the project comprised of marine-based
sediment and land-based sediment. The marine-based sediment will be disposed
in designated ways according to their categories, while the land-based
sediment will be treated by S/S technique and reused on site. No adverse environment impacts would be
expected from excavation, treatment, transportation and disposal of sediment. Operation
Phase: ¡P
The
main waste types generated during the operation of this Project would be
chemical waste and MSW from maintenance activities and staff. It is anticipated that no adverse
impacts would arise if the mitigation measures were strictly followed. |
|
Marine
Ecological |
Construction
Phase: ¡P
Temporary loss of subtidal hard and
soft bottom habitats/ marine waters due to the installation of steel pile
casing would be 0.0087 ha in size approximately. The direct impact is estimated to be
minor given the affected area is small and scattered. ¡P
Marine mode of transportation within
and outside of the Assessment Area could potentially cause vessel collision
to Chinese White Dolphins (CWDs). The impact of dolphin injury/ mortality
is not likely to be critical as most construction vessels are large-sized and
slow-moving. ¡P
Twenty three gorgonian coral colonies
located on boulder surface along REA2 would be impacted directly by the
construction works. With the
adoption of precautionary coral translocation and post-translocation coral
monitoring surveys, direct ecological impact would be further reduced. Indirect impacts on other coral
colonies (REA1 and REA3) and other marine fauna would be controlled by implementation
of good site practices such as the deployment of silt curtain and other water
quality control measures. ¡P
Noise disturbance arising from
construction works might indirectly reduce prey resources for CWDs, and
affect dolphin communication, navigation and prey detection within the Brothers Marine Park. Since construction-related
underwater noise has lower frequency than dolphin audiogram, while bored piling is adopted
to reduce strong noise disturbance to marine wildlife, the acoustic impact is
estimated to be acceptable. Operation
Phase: ¡P
Permanent loss of subtidal soft and
hard bottom habitats/ marine waters due to the construction of the Project
would be minimised to approximately 0.009ha. The direct impact is anticipated to be
minor given the affected area is small and scattered. ¡P
As no regular maintenance dredging
would be required, additional direct impact of habitat loss or mortality of
wildlife is not anticipated during operation phase. ¡P
Adverse hydrodynamic impacts on marine
life are anticipated to be insignificant, given hydrological changes of flow
regime, momentary flow, accumulated flow and flushing capacity are predicted
to be negligible. ¡P
Potential impacts of water pollution
arising from road surface runoff (e.g. chemical or oil spillage during
traffic accident on bridge) are predicted to be minimal. |
|
Landscape
and Visual |
¡P
On review of the potential residual
impacts arising from construction and operation of the Project, all LRs and
LCAs would be subjected to Insubstantial and Slight landscape impact, while all
VSRs would be subjected to Insubstantial to Slight visual impact by
operational Year 10. ¡P
The residual landscape and visual
impacts are considered acceptable with mitigation measures implemented such
as provision of amenity planting, aesthetically pleasing design of
aboveground/above-sea structures during construction and operation phases. |
|
Cultural Heritage |
¡P
Baseline review on the previous studies and
reports relating to the Project area was conducted. It was concluded that the seabed of
the Project area has no marine archaeological potential and further marine
archaeological investigation is not required. ¡P
No terrestrial archaeological potential and built
heritage resource are identified on reclaimed lands of HKIA and HKBCF Island within
the Project boundary. No impact
is anticipated from the construction works of the project to cultural
heritage resource during construction and operational phases. |