14.1 This EIA study has provided an assessment of the potential environmental impacts associated with the construction and operation of the Project according to the latest information available.
14.2 The environmental issues below have been assessed in the EIA Study, in accordance with the EIA Study Brief (No. ESB-125/2005) registered under the EIAO for the Project:
n Noise Impact
n Landscape and Visual Impacts
n Ecological Impact
n Waste Management Implications
n Land Contamination
n Air Quality Impact
n Water Quality Impact
n Sewerage and Sewage Treatment Implications
n Cultural Heritage Impact
n Hazard to Life
14.3 Specific mitigation measures necessary for avoiding or reducing impacts from the Project to acceptable levels, as well as environmental monitoring auditing procedures to ensure full implementation of all mitigation measures, as well as compliance with relevant standards and guidelines, have been developed during the detailed assessments. The Implementation Schedules listing the recommended measures are presented in Section 15.
14.4 The potential noise impact arising from daytime construction activities on the noise sensitive receivers (NSRs) located in the vicinity of the work sites was assessed. Noise generated from the use of powered mechanical equipment (PME) associated with the construction activities proposed for the Project would be the main concern.
14.5 The assessment results indicated that in the absence of mitigation measures, cumulative noise levels at the NSRs at the Waterfront would likely exceed the EIAO-TM noise criterion during construction.
14.6 In order to alleviate the predicted construction noise impacts, noise reduction measures including the adoption of good site practices, the use of quieter plant and movable noise barriers would be necessary. With the recommended mitigation measures in place, noise levels at all NSRs are predicted to comply with the EIAO-TM daytime construction noise criterion. No adverse residual construction noise impact is expected.
14.7 Road traffic noise impacts due to the proposed redevelopment were assessed for both “with development” and “without development” scenarios for a representative weekday and Sunday. Modelling results indicated that the increase in traffic noise levels due to the proposed redevelopment would be less than 1dB(A) except 1-2/F of NSR PTS1 and 1-4/F of NSR PTS2. However, the predicted noise levels at 1-2/F of NSR PTS1 and 1-4/F of NSR PTS2 would comply with the road traffic noise criterion of 65 dB(A) and 70 dB(A) for school and residential dwelling respectively. As no adverse project-induced traffic noise impact was predicted, no mitigation measure would be needed.
14.8 The assessment results indicated that adverse fixed plant and entertainment noise impacts arising from the operation of the Project would not be expected. However, monitoring of entertainment noise is considered necessary to ensure compliance with the EIAO-TM noise criteria. To verify the EIA predictions, a review of fixed noise source impact based on detailed design available in later stage is recommended. The recommended mitigation measures, monitoring procedures and locations are presented in the stand-alone EM&A Manual.
14.9 A large area will be affected by the construction of the Park, which will result in landscape and visual impacts. The adverse impacts due to the excavation of Nam Long Shan and its consequential effect to the existing landscape resources, landscape characters and visual sensitive receivers with incorporation of mitigation measures, will be acceptable.
The impact at
of operation of the redeveloped Park will be mostly visual.
Many VSRs located in the neighbourhoods of Wong Chuk Hang and the coast from
14.11 Impact of day-time glare would be avoided through the adoption of suitable building forms and materials. Night-time glare would be essentially “designed out” by carefully considering a reasonable level of functional and thematic lighting with due consideration of possible light pollution and night-time glare to the surroundings. With careful consideration in the design stage and adoption where necessary of suitable design features, there would be no residual day-time or night-time glare impact.
14.12 The key issue in terms of ecological impacts would include the habitat loss, direct impact on 9 plant species of conservation interest and the disturbance impacts to habitats and associated communities adjacent to the works areas arising from the excavation works of Nam Long Shan (The Headland Area) during the construction stage.
Potential permanent habitat loss resulting from the proposed
works would include:
To minimize potential impacts on
plant species of conservation interest, the construction design has been
considered to avoid impact to these species. If avoidance of these plant
species is not feasible, affected individuals (either locally uncommon or
species with restricted distribution in
14.15 With the implementation of the recommended mitigation measures including the use of quiet construction plant and temporary noise barriers, construction works would not result in unacceptable impacts on ecological sensitive receivers such as the Black Kite.
14.16 Loss of marine ecological resources is avoided as there would not be any marine-based construction works for this Project. With the implementation of water quality mitigatin measures and good site management practices, no adverse impact on coral communities would be anticipated during the construction and operation phase of the Project, nevertheless, coral monitoring is proposed as a precautionary measure. The coral monitoring programme would focus on the coral communities located close to potentially impacted areas.
14.17 No substantial increases in direct and indirect ecological impacts during park operation are expected over and above existing impacts resulting from the current operation of the Park.
14.18 Waste types generated by the construction activities are likely to include C&D material (from site formation, decommissioned equipment, excavation and tunnelling works), general refuse from the workforce, and chemical waste from the maintenance of construction plant and equipment. Provided that these wastes are handled, transported and disposed of using approved methods and that the recommended good site practices are strictly followed, adverse environmental impacts are not expected during the construction phase.
14.19 The main waste types to be generated during park operations would be similar to the existing operation of the park, and include general refuse (from site operations and general services) and food and beverage waste (from catering services), as well as some chemical waste, biological waste (clinical waste and expired drugs) and the occasional animal carcass. Based on the predicted increase in visitor and staff numbers following redevelopment of the Park, the quantity of general refuse and food and beverage waste has been estimated to increase by approximately 30% and would be met by a commensurate increase in the number of waste collection bins and collection points provided at the Park. The handling, collection, transportation and disposal practices of the identified waste arising would follow the existing arrangements currently in operation at the Park.
An investigation of the historical/current land uses,
including a desk-top review and site inspection, at the Hong Kong School of
Motoring (HKSM), Citybus Depot (CBD) and existing
The concern of contamination at the HKSM and CBD arises from
the presence of vehicle refuelling/ washing area, vehicle maintenance workshop
and chemical waste storage area. For the
14.22 Two Contamination Assessment Plans (CAP) which detail the sampling locations and testing schedules of the site investigation (SI) have been prepared. A total of 20 sampling locations are proposed for the HKSM and CBD, with 10 sampling points at each site. Citybus Limited has given its consent to Ocean Park Corporation (OPC) to submit the CAP on their behalf. The CAP prepared for HKSM under this EIA is for illustrative purpose only. The party responsible for land contamination SI at the HKSM site in the future would need to separately submit a CAP for Environmental Protection Department (EPD)’s approval.
14.23 For CBD site, the SI was conducted from 31 March to 3 April 2006. The results as presented in the CAR indicated that the concentration of most of the heavy metals in the soil samples are acceptably low except arsenic and tin at five specified locations. Considering that the elevated levels of heavy metals are found very localised in the fill materials, the source is probably not due to the past site activities/surface spillage and the level of materials would be kept untouched during the construction stage, direct impact to the construction workers would not be anticipated.
14.24 A further study, Toxicity Characteristic Leaching Procedure (TCLP) testing, will be conducted in order to determine the leachability (hence the toxic risk) of the soil with elevated level of metals at the CBD site. For a conservative approach, clean-up strategy is proposed for the soil contaminated with heavy metals with details in the Remediation Action Plan (RAP).
The soil with elevated level of arsenic/tin (~
Elevated total petroleum hydrocarbon (TPH) concentrations
above the B value of 1,000mg/kg were found in two sampling locations in the
immediate vicinity of the underground refuelling tanks. Soil remediation at
these locations is recommended with details in the RAP. The excavation of BH-2 is
proposed to be down to
14.27 For HKSM Site, in view of the current site condition observed from site inspection, information obtained from Fire Services Department (FSD)/Environmental Protection Department (EPD) without bulk spillage/ leakage and nature of business without heavy contaminative activities involved, only small-scale contamination caused by localised leakage/ spillage is likely to be encountered. Insurmountable impacts on the surrounding environment in respect of land contamination would therefore not be anticipated.
Based on professional judgement and experience gained from
other similar projects involving leaks from underground storage tanks, the
contamination would normally be found at the “smeared” zone (i.e.
14.29 The SI for HKSM should be conducted as soon as possible after the site operation ceases. A CAR should be prepared to document the findings of the SI and identify any need for remediation. If land contamination is confirmed, a RAP should be drawn up to formulate necessary remedial measures. The subsequent CAR and RAP should be endorsed by EPD prior to implementation of any remedial works.
14.30 Different remediation options and associated treatment programme have been proposed based on the estimated quantity of contaminated soil and nature of possible contaminants. Both Tai Shue Wan and the open space near the existing Nam Long Shan rest garden are considered technically feasible for the proposed remediation works. The CS/S works for heavy metal contaminated soil is proposed to be carried out in the HKSM site if the soil volume is small. The biopile and/or CS/S treated soil will be re-used on site. Appropriate mitigation measures have been recommended to minimise environmental impacts during soil excavation, transportation and remediation. No adverse residual impact in respect of land contamination is anticipated if necessary remediation works are carried out in respect of any identified contaminated land.
14.31 In the event that the current users or responsible parties of the HKSM Site do not fulfil its obligations to undertake a CAP, CAR or RAP or the necessary remediation to the satisfaction EPD, and the site handed-over to OPC is not totally cleaned (for technical or other reasons), then the whole HKSM site will initially be fenced off and the suspected contaminated area will be fully demarcated and isolated. The purpose of fencing the site is to restrict access to ensure there would be no risk to the general public. Following this, OPC undertakes to carry out, to the extent outstanding, the site investigation. Such an undertaking does not relieve the existing users of their obligations to clean the site, nor does it in any way restrict OPC’s rights to recover the costs of carrying out the SI works from the responsible parties.
14.32 Once the SI results are available, the potential contaminated area could be identified and the fenced-off area could be adjusted to isolate only the area of contamination. OPC would ensure that no work would be undertaken within the fenced off area. OPC would modify the design of the new entry plaza and access road so as to accommodate this fenced off area in its layout and to limit access to, as well as circulation around it.
OPC has confirmed that the space and time requirements for
contamination investigation and/or treatment of contaminated soil can be
accommodated in the overall design and redevelopment programme for
14.34 With the implementation of effective dust suppression measures, no adverse construction dust impact would be expected in the vicinity of the project. Similarly, visitors in the park should not be affected.
The air quality impact due to operation of the future
14.36 The key issue in terms of water quality would be the potential for release of sediment-laden water during excavation and slope works for the construction phase of the redevelopment. Water quality deterioration could be avoided through implementing adequate control measures on site runoff and drainage from the works. Proper site management and good housekeeping practices would also be required to ensure that construction wastes and other construction-related materials would not enter water bodies and the public drainage system. Sewage effluent arising from the construction workforce would be handled through provision of portable toilets.
14.37 With the implementation of these recommended mitigation measures, the construction works for the Project would not result in unacceptable impacts on water quality. Site inspections should be undertaken routinely to inspect the construction activities and works areas in order to ensure the recommended mitigation measures are properly implemented.
14.38 Additional types of operation discharge from the future operations at the redeveloped Park are not expected, and there would not be any additional discharges containing disinfectants/ residual chemicals produced from the marine life keeping system aquariums and visitor attraction facilities at the redeveloped Park. Measures have been recommended to control non-point sources of discharge including surface drainage from landscaped areas where fertilisers or pesticides may be applied. As such, the operation of the redeveloped Park would not be expected to result in unacceptable impacts on water quality. Upgrading of the existing foul sewerage system within the Park will be required to prevent sewage overflow and/or emergency bypass as a result of capacity constraint of the sewerage system. There is no proposal for sewage treatment and disposal within the redeveloped Park.
14.39 The performance of the existing sewerage infrastructure under Territory Population and Employment Data Matrices (TPEDM) projected population condition was assessed and formed the Baseline Condition.
impact assessment (SIA) takes into account of the
The adopted unit flow factors are based on the
recommendations of the DSD’s
(SM). The recommended peaking factors are based on
the SM. The estimated peak flow is
The performance assessment results have identified
surcharged sewers measuring a total length of
14.43 The Aberdeen PTW was assessed to be adequate to convey the total catchment flows under both Baseline and Future Conditions under this Study.
Grave G1 lies within the existing
14.46 A QRA study for the explosives related activities for the Project has been carried out. The risk level for the original Base Case was found to be unacceptable and therefore a new blasting strategy has been developed in consultation with Mines Division of CEDD. A number of additional risk control measures were identified and were included in this revised Base Case. For the revised Base Case, the level of offsite societal risk is within the acceptable limit, and since no area of individual risk greater than 10-5 per year could affect the public, therefore the risk level of the revised Base Case is considered acceptable.
14.47 In the case of the transport of explosives to the north portal of the funicular system, an assessment is also included in the QRA based on the specific controls set down for this transport for separate consideration by the Relevant Authority. The associated level of risk is within the acceptable range. In the event that this transport is not agreed, it will not be undertaken. Consideration of this activity should therefore be considered as distinct from the proposed on site storage of explosives and transport of the explosives to other blast sites that do not require off-site transport.
14.48 The findings of this EIA study have determined the likely nature and extent of environmental impacts predicted to arise from the construction and operation of the Project. The EIA has, where appropriate, identified mitigation measures to ensure compliance with environmental legislation and standards.
Overall, the EIA study for the proposed redevelopment of
Table 14.1 Summary of Key Environmental Outcomes / Benefits
Environmental Outcomes / Benefits and Mitigation Measures
Purpose and Scope of the Project
purpose of the Project is to upgrade and expand the existing
The Project comprises various construction works for: civil infrastructure, utilities, primary life support systems, municipal facilities, area development, parkwide systems, hard/ soft landscape & area theming, attractions venues, installation of rides, merchandise/ retail facilities, food and beverage facilities and back of house facilities (refer to Section 2.4 for details).
Design options selection
The majority of the works comprise redevelopment works within the existing park footprint to minimise impacts on other areas.
A funicular railway through a tunnel and operating by cables driven by electricity is proposed to minimize the construction and operation environmental impacts due to establishment of a new visitor transportation link between the Lowland area and the Headland area. The revised design is all in tunnel, resulting in less noise, ecological, and landscape and visual impacts than the previously proposed viaduct section.
A new access road from Tai Shue Wan to the Headland area would no longer be implemented because of the likely ecological impacts arising from construction.
The tall shrubland between Nam Long Shan Road and Tai Shue Wan is preserved in the current Park expansion scheme to reduce ecological impacts.
Previous schemes to develop different levels at the hillside on Nam Long Shan would not be implemented, which would reduce long term long energy consumption arising from the operation of passenger lifting devices for transporting visitors between different levels.
reservoir proposed near the summit of Nam Long Shan has been relocated to the
conveyor belt system is proposed for rapidly conveying the excavated material
from the excavation site for the new
Barges are to be employed for
transporting majority of the surplus C&D material from the site formation
Blasting is proposed for rock
excavation at the
Traffic noise associated with the operation phase of the Project was assessed for both the “with redevelopment” and “without redevelopment” scenarios on weekday and Sunday. Modelling results indicated that the increase in overall traffic noise levels predicted at all representative NSRs except 1-2/F of NSR PTS1 and 1-4/F of PTS2 would be less than 1dB(A). However, the predicted noise levels at 1-2/F of NSR PTS1 and 1-4/F PTS2 would comply with the noise criteria of 65dB(A) and 70 dB(A) for school and residential dwelling respectively. Thus, no mitigation measure is required.
The assessment results also indicated that predicted noise levels at all NSRs arising from the fixed plants of the Project would comply with the EIAO-TM criteria. No mitigation measures would be necessary.
Noise impacts from loudspeakers for nightly lagoon shows would comply with the noise criterion as set out in the EIAO-TM with all the proposed mitigation measures in place. To ensure compliance with the EIAO-TM noise criteria, monitoring of entertainment noise is considered necessary during nighttime show. A noise review study will be conducted in detailed design stage to verify the EIA predictions.
Landscape and Visual
Excavation of “The Summit” at Nam Long Shan and construction of “The Waterfront” will affect existing landscape resources, landscape characters and visual sensitive receivers. The impacts would be acceptable with the implementation of recommended mitigation measures.
Visual impacts from the funicular railway viaduct structure have been avoided by placing the entire railway in tunnel.
Visual impacts from the proposed
reservoir have been reduced by relocating the reservoir to an area within the
footprint of the
Impact of day-time glare would be avoided through the adoption of suitable building forms and materials. Night-time glare would be essentially “designed out” by carefully considering a reasonable level of functional and thematic lighting with due consideration of possible light pollution and night-time glare to the surroundings. With careful consideration in the design stage and adoption where necessary of suitable design features, there would be no residual day-time or night-time glare impact.
Ecological impacts (including habitat loss, impact on plant species of conservation interest and disturbance impacts to habitats and associated communities arising from the excavation works at Nam Long Shan) would be minor and acceptable with the implementation of recommended mitigation measures. No adverse impact on coral and other marine communities would be expected during the construction and operation phase of the Project.
Loss of tall shrubland habitat has
been avoided by placing the funicular railway entirely in tunnel, rather than
a section running on viaduct structure, and by relocating the reservoir to an
area within the footprint of the
Loss of tall shrubland habitat would be compensated by a greater area of planting (using natural species) at an area within and adjacent to the Park.
Loss of marine ecological resources is avoided as there would not be any marine-based construction works for this Porject.
Waste management implications
Construction waste arisings have been identified based on the proposed construction activities and would comprise C&D material, general refuse and chemical waste. Provided that the identified waste arisings are to be handled, transported and disposed of using approved methods and the recommended good site practices are to be strictly followed, adverse environmental impacts would not be expected during the construction phase.
The handling, collection, transportation and disposal practices of waste generated during the operational phase would follow the existing arrangements currently in operation at the Park.
on the desk-top study and the findings of site
sign of contamination is noted in the existing
Site investigation conducted at CBD in March 2006 indicated that elevated TPH concentrations were identified at 2 sampling locations near the underground storage tanks whereas elevated levels of arsenic/tin were also identified at five sampling locations.
Excavation and landfill
disposal is recommended for TPH contaminated soil, with quantity of ~
For a conservative
approach, cement solidification/stabilization treatment is recommended for
the heavy metals contaminated soil (~
It is proposed that site investigation works should be conducted at the HKSM site as soon as possible prior to the commencement of site clearance/ construction works.
No adverse residual impact in respect of land contamination would be anticipated if necessary remediation works are carried out at the identified contaminated land in the HKSM and CBD sites.
No adverse dust impacts would be expected on the ASRs within (e.g. visitors) or in the vicinity of the Park with the implementation of effective dust suppression measures.
The operation of the proposed Project would not incur adverse air quality impacts to the nearby ASRs.
Water quality impacts from construction activities would be controlled by implementing the recommended mitigation measures.
Additional types of operation discharge from the future operations at the redeveloped Park is not expected. Operational improvements would be implemented to ensure control of discharges within statutory limits.
Upgrading of the existing foul sewerage system within the Park will be required to prevent sewage overflow and/or emergency bypass as a result of capacity constraint of the sewerage system.
Sewerage and Sewage Treatment Implication
The performance assessment results under the peak flow
condition have identified
The Aberdeen PTW was assessed to be adequate to convey the total catchment flows both with and without the Project.
The HKSM and the City Bus Depot sites were assessed to be of low archaeological potential. An archaeological Investigation will need to be undertaken prior to the construction phase to verify the absence or presence of archaeological deposits.
The construction works would not affect a historical
grave located in the Lowland section of
Hazard to Life
A Quantitative Risk Assessment study for the explosives related activities for the Project has been carried out. The risk level for the original Base Case was found to be unacceptable and therefore a new blasting strategy has been developed in consultation with Mines Division of CEDD. A number of additional risk control measures were identified and were included in this revised Base Case. For the revised Base Case, the level of offsite societal risk is within the acceptable limit, and since no area of individual risk greater than 10-5 per year could affect the public, therefore the risk level of the revised Base Case is considered acceptable.