9.1.1 This EIA Report has provided an assessment of the potential environmental impacts associated with the construction and operation of the development on the proposed CWB & IECL Project based on the latest information available. The key environmental outcomes arising from this EIA are:
the existing air sensitive receivers
from Sheung Wan to
as no adverse operational air quality
impacts at the existing and planned air sensitive receivers from Sheung Wan to
the existing noise sensitive receivers from Sheung Wan to Causeway Bay, including Korea Centre, Causeway Centre, Elizabeth House, Riviera Mansion, Mayson Garden Building, Belle House and Victoria Centre will be protected from adverse construction noise impact by the recommended noise mitigation and control measures (Section 4.7) during construction phase; and
recommended noise mitigation measures will be effectively alleviate the road
traffic noise impacts arising from the proposed new roads on the existing
residential noise sensitive receivers at
9.1.2 The Implementation Schedules of the recommendations are presented in Section 10. The principal findings of this Report are summarised below.
9.2 Air Quality Impact
During construction phase, adverse dust impacts
are predicted at the ASRs from Sheung Wan to
CWB & IECL project (excluding works entrusted to TDD), managed by HyD:
strictly limit the truck speed on site to below 10 km per hour and water spraying to keep the haul roads in wet condition;
twice daily watering of the work site with active operations when the weather and the work site are dry;
watering during excavation and material handling;
provision of vehicle wheel and body washing facilities at the exit points of the site, combined with cleaning of public roads where necessary; and
tarpaulin covering of all dusty vehicle loads transported to, from and between site locations.
CWB entrusted works, managed by TDD under WDII project:
strictly limit the truck speed on site to below 10
km per hour and water spraying to keep the haul roads in wet condition; · twice
daily watering of the work site with active operations when the weather and the
work site are dry.; · watering during excavation and material handling; · provision
of vehicle wheel and body washing facilities at the exit points of the site,
combined with cleaning of public roads where necessary; and · tarpaulin
covering of all dusty vehicle loads transported to, from and between site
CWB entrusted works, managed by TDD under CRIII project:
strictly limit the truck
speed on site to below 10 km per hour and water spraying to keep the haul roads
in wet condition; ·
twice daily watering of the work site with active
operations when the weather and the work site are dry.; ·
watering during excavation
and material handling; ·
provision of vehicle wheel
and body washing facilities at the exit points of the site, combined with
cleaning of public roads where necessary; and ·
tarpaulin covering of all
dusty vehicle loads transported to, from and between site locations.
9.2.2 With the above mitigation measures, good site practices and comprehensive dust monitoring and audit, no adverse cumulative construction dust impact is predicted at the air sensitive areas.
9.2.3 The dispersion of NO2, RSP and CO arising from the background pollutant levels within and adjacent to the CWB & IECL, vehicle emissions from open road networks, tunnel portal and ventilation building emissions from the CWB & IECL, tunnel portal emissions from the Cross Harbour Tunnel, and portal emissions from the existing underpasses and the planned deckovers was modelled.
9.2.4 With the proposed tunnel portals and ventilation building emissions as well as the design of the ventilation buildings for the CWB & IECL, no adverse cumulative air quality impact is predicted at the air sensitive receivers. Therefore, no mitigation measures are required.
9.2.5 For the air pollution within the tunnel section of the CWB & IECL, monitoring of tunnel air quality should be required to ensure the acceptability of the tunnel air quality criteria.
9.3 Noise Impact
9.3.1 This assessment has predicted the construction noise impacts associated with the construction works of the proposed Project and other concurrent projects including the CRIII, the WDII and the Causeway Bay Flyover. With the use of silenced equipment, movable noise barriers, reduction in the number of some PMEs and PMEs percentage on-time for some construction tasks at some specific locations, the predicted noise levels of all residential representative NSRs and the open arena of Hong Kong Academy for Performing Arts would comply with the EIAO-TM construction noise criteria. Noise exceedances are still predicted at two performing art centres (Art Centre and HKCEC Extension). However, these NSRs are equipped with central air-conditioning system and good noise insulation facilities. Since they do not rely on openable windows for ventilation, adverse noise impacts are therefore not expected at these NSRs and further mitigation measures for these NSRs will not be required. Exceedance of the noise criterion is also predicted at Peoples’ Liberation Army Headquarters, dominantly due to construction noise from CRIII project. However, movable noise barrier will be adopted during CRIII construction and the PLA Headquarters are equipped with air conditioning. Therefore, no adverse noise impact is expected on the concerned receivers. A construction noise EM&A is recommended to check compliance with the noise criteria.
9.3.2 The potential road traffic noise impacts have been assessed for the worst-case traffic flows in 2027. Most of the noise sensitive receivers are predicted to exceed the EIAO-TM traffic noise criteria. Direct mitigation measures such as vertical barriers, cantilevered barriers and semi-enclosure have been proposed on the ‘New’ roads to alleviate the traffic noise impacts. With the implementation of all recommended practicable direct mitigation measures, exceedances are still predicted at most of the NSRs dominantly due to existing roads except the Victoria Centre. As all direct mitigation measures are exhausted, eligibility assessment for the provision of indirect technical remedies has been undertaken for these NSRs as well as other NSRs.
9.3.3 According to the eligibility assessment results, no NSRs are eligible for the consideration of indirect technical remedies in the form of window insulation and air-conditioning since none of them could fulfil all of the eligibility criteria.
9.3.4 Assessment has been undertaken for fixed plant noise arising from the proposed ventilation building. The predicted ventilation shaft noise levels at the NSRs in the vicinity of ventilation buildings would comply with the EIAO-TM if silencers are provided at all exhaust fans for the proposed three ventilation buildings and included in the design specification. With the consideration of cumulative ventilation shaft noise impacts from NHKIL ventilation building, no exceedance of EIAO-TM is expected at the representative NSRs as the noise level generated from NHKIL ventilation building should comply with the EIAO-TM and NCO requirement.
9.4 Water Quality Impact
9.4.1 As no reclamation will be undertaken directly for the CWB & IECL, the primary concern with regard to water quality will be the control of runoff during construction. This could potentially contain elevated concentrations of SS, and could impact upon the flushing and cooling water intakes located along the Victoria Harbour waterfront, identified as potential sensitive receivers. However, the potential water quality impacts could be controlled to comply with the WPCO standards by implementing the recommended mitigation measures. No unacceptable residual water quality impact is anticipated.
9.4.2 Mitigation measures with adequate maintenance are also recommended to remove oil and grease from the road runoff during operation. No unacceptable residual water quality is expected.
9.5 Construction Waste Management and Disposal
9.5.1 Provided that waste arisings from the construction of the CWB & IECL are handled, transported and disposed of using approved methods as recommended in Section 6.7, and that no solid or liquid wastes enter nearby marine waters, no unacceptable environmental impacts are envisioned. In most cases, the inert C&D material can be reused within the project or at reclamation or public filling areas, whilst the non-inert C&D material will be disposed of to landfill.
9.5.2 The mitigation measures recommended in this EIA Report should be incorporated into contract specifications to ensure that environmental nuisance does not arise from the storage, transport and disposal of various types of waste arising from the construction of the CWB & IECL. These recommendations should form the basis of the site Waste Management Plan to be developed by the Contractor at the construction stage.
9.6 Landscape and Visual Impact
The potential significant residual impacts during the construction phase will be:
9.6.1 Moderate adverse impacts occur through vegetation removal at the eastern and western above ground sections of the CWB & IECL. Significant adverse impacts will occur through close proximity to the construction works at Royal Hong Kong Yacht Club (RHKYC), Police Officers’ Club (POC), Causeway Bay Typhoon Shelter and Promenade; their quality of recreation use will be significantly affected.
9.6.2 Significant adverse impacts along the majority of the CWB & IECL length from buildings with a harbour outlook, especially in Causeway Bay, Tin Hau and Tai Hang districts. Moderate / significant adverse impacts on near or adjoining open space and recreation areas such as the Victoria Park, RHKYC, POC, and Causeway Bay Typhoon Shelter and Promenade. Moderate adverse impacts on VSR’s with distant views from Tsim Sha Tsui waterfront.
9.6.3 Residual impacts in operation phase are taken at Year 10 when planting is assumed to have been matured providing screening effect. The potential significant residual impacts during the operational phase will be:
9.6.4 Significant adverse impacts at RHKYC and Causeway Bay Typhoon Shelter and moderate / significant adverse at the future WDII waterfront open space due to the dominance of the elevated IECL and its associated noise abatements. Moderate adverse impacts will be incurred at the POC, and Victoria Park and Victoria Park Road due to the dominance of the elevated IEC structures.
9.6.5 Significant to moderate / significant adverse impacts on VSRs are generally in the Tin Hau, Tai Hang, Causeway Bay and Wan Chai districts where numerous residential and hotel buildings have clear views of the IEC. The Central area will have one significant adverse impact VSR – the residential units at Shun Tak Centre. Airport Railway Hong Kong Station Northern Site Development will have a moderate / significant adverse impact due to the West Ventilation Building having similar height as the development’s future outdoor terrace. Moderate / significant adverse impact also occurs at the RHKYC, the POC, the Causeway Bay Typhoon Shelter and Promenade, future waterfront open space within WDII, and future waterfront related commercial and leisure uses within WDII due to the close view of the elevated IECL.
9.6.6 Overall in the context of Annex 10 of the EIAO-TM, the landscape and visual impacts are acceptable with mitigation measures during the construction and operational phases of the Project. The proposed mitigation measures for the tunnel and above ground sections are summarised in Table 7.5.
9.6.7 Residential receivers at Riviera Mansion, Prospect Mansion, Miami Mansion, Highland Mansion, Marco Polo Mansion, Victoria Park Mansion, Chesterfield Mansion (VSR51) with significant adverse visual impact are in a location where the total height of the proposed elevated IECL and the associated 5.5 m high vertical noise barrier and 5.5 m high with 2 m cantilevered noise barrier will become an imposing feature to the residential flats facing the harbour. The Project will pose a key concern on the issue of visual impact to this localised area in Causeway Bay. Other VSR’s categorised with significant adverse impacts are Gloucester Road 160-233 (VSRVSR44), Elizabeth House (VSR45), Top Glory Tower/Hoi Kung Court/Hoi To court/Hoi Dee Court (VSR47), Belle House, Gordon House (VSR61), Mayson Garden Building (VSR62), Victoria Court (VSR63), Viking Court (VSR64), Triumph Court (VSR65), Park Towers (VSR66), King’s Road 2-14 (VSR67), and Harbour Heights (VSR72). The mitigation measures proposed at these areas within the Project have limited potential to reduce the scale of the impact. Future developments and landscape proposals undertaken within adjoining projects at the Wan Chai Development Phase II project area may alleviate some adverse impacts by offering a high quality alternative view.
9.7 Overall Conclusion
9.7.1 The findings of this EIA have provided information on the nature and extent of environmental impacts arising from the construction and operation of the Project. The EIA has, where appropriate, identified mitigation measures to ensure compliance with environmental legislation and standards.
9.7.2 Overall, the EIA Report for the development of CWB & IECL has predicted that the Project will comply with environmental standards and legislation after the proposed construction and operational stage mitigation measures are implemented. This EIA has also demonstrated the general acceptability of the residual impacts from the Project and the protection of the population and environmentally sensitive resources. Environmental monitoring and audit mechanisms have been recommended before and during construction and operation, where necessary, to verify the accuracy of the EIA predictions and the effectiveness of recommended mitigation measures.