Government of the Hong Kong
Agreement No. CE
Demolition of Buildings and
Proposed Kennedy Town
Comprehensive Development Area Site
Impact Assessment (Final Report)
Atkins China Ltd
: Civil Engineering Department
No. (if any) : -
Title : Environmental Impact
Assessment for Demolition of Kwai Chung Incinerator Plant and Kennedy Town
Project No. : 2996
Document No. : 2996-OR025-05
Controlled Copy No. :
Covering Letter / Transmittal Ref. No. :
Date of Issue :
and Approval/Authorisation Records
Prepared by / date
Reviewed by / date
App. or Auth. By /
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Note : App. and Auth. mean “Approved” and “Authorised”
Engineering Departmentof the Government of the Hong Kong
Special Administrative Region
to EPD a project profile for the Demolition of Buildings and Structures within
the Proposed Kennedy Town Comprehensive Development Area (KTCDA). A study brief (ESB-023/98) for the EIA of the
demolition was issued by EPD under the EIAO in December 1998. CED subsequently compiled a Study Brief (SB)
for the consultants and appointed Atkins China Ltd to provide professional
consulting services for the Environmental Impact Assessment for the Demolition
of the Kennedy Town Comprehensive Development Area (under Agreement No. CE
15/99). The detailed technical
requirements of the EIAO SB (ESB-023/98) require assessment of specific impacts
associated with air quality, noise, waste management, land contamination,
hazard to life, environmental monitoring and audit. Air quality and hazard assessments are
required only in the event that a blasting methodology was adopted for the
demolition. Impacts on landscape,
ecology, water quality, historical and cultural heritage, land use, agriculture
and fisheries are not identified to be of concern in the SB for Agreement No.
CE 15/99 which includes the requirements of the study brief issued under the
EIAO (ESB-024/98). (CED)
The demolition of
a municipal incinerator constitutes a designated project under the provisions
of the Environmental Impact Assessment Ordinance (EIAO). The Kennedy Town Incineration Plant (KTIP)
site has been decommissioned and requires demolition. There is an animal carcass incinerator at
Kennedy Town Abattoir (KTA) that remains temporarily in operation although this
will also require decommissioning. If
the project were not to proceed, the premises will progressively dilapidate and
fall into disrepair, potentially causing hazard to the surrounding environment
and general public and therefore demolition is required in due course. Public concerns can be summed up as being
that the decommissioned plant is removed safely with the minimum of necessary
disturbance to the daily routine of the local environs.
This EIA Report has been structured to present the key issues and available
data in a form that reflects the topics requiring study as required under the
SB. The preferred demolition methods have
been agreed and noise and waste management assessments have been
completed. Based on professional judgement air quality assessment is not required because of the
nature, scale and location of the project and the elected demolition method will not include
blasting techniques. The requirements of
the Air Pollution Control (Construction Dust)
the APCO will apply, ensuring that air quality is in compliance with
established standards and criteria.
Dedicated reports on land contamination and asbestos assessments have
been completed after Site Investigation and the investigations and asbestos and
land contamination assessments are therefore presented in summary in this EIA.
In order to
satisfy the requirements of the EIA it is necessary to define clearly the
nature of the works involved in the demolition process. At an early stage of the study a Working
Paper (WP1 on Preferred Demolition Methodology) was presented and endorsed by
the First Steering Group Meeting (1st December 1999). The development of a conceptual scheme for
the demolition process reviewed in WP1 is presented at Appendix A to describe
the project. The conceptual scheme for
demolition of the facilities has been developed based on practical experience
and current demolition practice in Hong Kong and internationally.
Blasting will not be used in the demolition process.
The purpose of
this study is to provide information on the nature and extent of environmental
impacts, and potential safety and health hazards, arising from the demolition
and clearance of all buildings, structures and chimneys, and remediation of
contaminated ground, within the proposed Kennedy Town Comprehensive Development
Area (KTCDA) Site (the proposed “Project”) and related activities taking place
concurrently. This information will
contribute to decisions on :-
overall acceptability of any adverse environmental consequences that are likely
to arise as a result of the proposed Project;
conditions and requirements for the detailed design and/or demolition of the
proposed project to mitigate against adverse environmental consequences and
potential safety and health hazards wherever practicable;
acceptability of residual impacts after the proposed mitigation measures are
The objectives of
the Environmental Impact Assessment (EIA) study are as follows :
to describe the proposed
project and associated works together with the requirements for carrying out
the proposed project;
to identify and describe the
elements of the community and environment likely to be affected by the proposed
project and/or likely to cause adverse impacts to the proposed project,
including both the natural and man-made environment;
to identify and qualify
emission sources and determine the significance of impacts on sensitive
receivers and potential affected uses;
to propose the provision of infrastructure
or mitigation measures so as to minimise pollution, environmental disturbance
and nuisance during demolition;
to identify, predict and
evaluate the residual (i.e. after practicable mitigation) environmental impacts
and the cumulative effects expected to arise during the demolition of the
facilities in relation to the sensitive receivers and potential affected uses;
to identify, assesses and
specify methods, measures and standards, to be included in the detailed design
and demolition of the project which are necessary to mitigate these
environmental impacts and reducing them to acceptable levels;
to investigate the extent of
side-effects of proposed mitigation measures that may lead to other forms of
to identify constraints
associated with the mitigation measures recommended in the EIA study; and
to design and specify the
environmental monitoring and audit requirements, if required, to ensure the
implementation and the effectiveness of the environmental protection and
pollution control measures adopted.
A description of the elements of the community and environment, likely to
be affected by the proposed demolition activities is provided in Section
2. This is presented to confirm
potential constraints on the demolition works, due to the need to protect
sensitive receivers, surrounding infrastructure or facilities. The summary establishes requirements that
have been identified and which constrain the way the proposed Project is
executed including the choice of demolition methods.
In addition to
this introduction the EIA includes sections covering the following:
Section 2 Study Area, Sensitive Receivers, Constraints
and General Approach to Demolition.
Section 3 Asbestos Control.
Section 4 Land Contamination.
Section 5 Noise.
Section 6 Air Quality.
Section 7 Waste Management.
Section 8 Environmental Monitoring and Audit.
Section 9 Conclusions and Recommendations.
Kennedy Town Comprehensive Development Area (KTCDA) is situated next to Victoria Road
and Cadogan Street, Kennedy Town, and adjacent to Victoria Harbour, with a Site area of about 34,000 square metres (Figure 2.1).
The KTCDA comprises
several elements as well as the Kennedy Town Incineration Plant (KTIP). The main operations at the Kennedy Town
Abattoir (KTA) ceased and relocated to new facilities at Sheung Shui in the
autumn of 1999. The KTA includes an
incinerator for disposal of animal carcasses and waste that is managed by EPD.
Part of the
former EMSD Depot that forms part of the KTCDA has been leased to New World
First Bus (NWFB) for bus maintenance and refuelling, under a short-term
tenancy. The remainder is leased as a
car / lorry park (CP). These facilities
will remain in operation until Site possession is required for the project.
Kennedy Town Wholesale Market has been relocated and this area has been recently
remodelled as a park and sitting out area adjacent to Victoria Road. This is known as the Cadogan Street Temporary
(FEHD) have a refuse collection point (RCP) between the park and the abattoir
at Sai See Street. Urban Services Department
At this stage the
Incineration Plant (KTIP);
Kennedy Town Abattoir
World First Bus Depot (NWFB);
Car / lorry park
Collection Point (RCP); and USD
Cadogan Street Temporary Garden (CSTG).
The structures to
be demolished are summarised in Table 2.1.
The KTCDA was
recommended for future private housing development in the “Planning and
Engineering Study for the Redevelopment of Mount Davis Cottage Area and Kennedy
Town Police Married Quarters” (Agreement No. CE 52/97), completed in
May1999. Under that study the Open Space
and Refuse Collection Point were proposed for relocation within the
Kennedy Town Development and Route 7 (R7), a strategic road link between Kennedy Town and Aberdeen, are
located just to the north of the KTCDA Site although the exact extent of the
Kennedy Town Development and alignment of R7 is not yet confirmed. A further planning and engineering study to
address some major issues, including the Kennedy Town Development and
alternative road alignments for R7, is currently being considered by
Government. This further study may alter
the future land use of the KTCDA.
It has been
assumed that the demolition for KTCDA will take place as soon as possible in
order to allow future developments on and near the Site. The start date is tentatively scheduled for
late 2003. Experience of other
demolition sites and consultation with local contractors suggests that a twelve
month programme for the demolition would be sufficient. The soil remediation programme would follow
the demolition and would last an additional six to eight months based on the
current findings of the ground contamination investigation.
2.1 Structures to be demolished at
reinforced concrete chimneys, 60m high, 3.5m in diameter.
concrete structure of approximately 3,025m² on plan
Kennedy Town Abattoir
reinforced concrete structures of approximately 9,500m² on plan, including,
& M Services Department Building
and Carcass Incinerator Building.
reinforced concrete chimney, 25m high, 3m in diameter.
World First Bus Depot
Vehicle Inspection Bays. Overall size is approximately 600m² on plan.
and lubrication oil store
Kong Electric Sub Station
Storey Transformer House (adjacent to lairage)
Cadogan Street Temporary Garden
landscaped area with street lighting and sitting areas
Street Refuse Collection Point
steel and concrete structure, single storey. *
*See Section 2.2
identifies the sensitive receives (SRs) affected by the Project as defined in
the EIAO and summarises the main implications of the SRs and infrastructure on
demolition methods. The implications for
sensitive locations of explosive demolition are noted and these have been fully
discussed in Appendix A. Sensitive
receivers and other constraints are shown in Figure 2.1. The Outline Zoning Plan for the area is
presented in Figure 2.2.
Receivers at KTCDA
Residential, Government, Institutional and
Government, Institutional and Community uses surround the KTCDA Site and many
are elevated and overlook the Site. The
nearest rank of sensitive receivers is discussed below.
Police Married Quarters currently overlooks the Site. The premises are scheduled to be vacated but
parts of the buildings will potentially be occupied up to March 2002.
The Mount Davis
Cottage Area has been vacated.
Society development at Ka Wai
occupied residential buildings at Cadogan Street
including Centenary Mansion.
Other premises in
the low-rise blocks in Cadogan
Street have been
Premises in the
low rise blocks in Cadogan Street (south of Victoria Road) and two high rise
blocks (Sai Wan New Mansion and Cheung Kat Mansion) near the URA development,
will remain in operation by the time demolition of KTCDA takes place.
Manhattan Heights high
rise development at Kennedy Town New Praya overlooks the Site and is now
occupied. As such it is considered as a
There are other
residential blocks further west along Victoria Road
(e.g. Huncliff Court) that would be shielded by the intervening structures such as the
China Merchants Wharf Godown and other industrial buildings on Victoria Road.
Government, Institutional and Community uses at St Luke’s Church School, St
Luke’s Settlement, Jockey Club Clinic, Victoria Mortuary and the Bayanihan
St Luke’s Church School on Ka Wai Man Road
and both St Luke’s Settlement and Jockey Club Clinic will remain in operation
at the time of demolition for KTCDA.
Centre on Victoria Road is a training and support facility for Philippine overseas workers that is open seven days per week and it is
assumed this will remain in operation at the time of the demolition of KTCDA.
Sensitivities near KTCDA
2.2.10 The New World First Bus Depot may require relocation
to the demolition. However this is not
material to the EIA as it is not defined as an SR. Nevertheless the project proponent may need
to liase with NWFB so that they may make provisions for these facilities at a
later stage. Diesel fuel storage tanks
and other lubrication oil storage at NWFB are dealt with as part of the land contamination
assessment and remediation action plan.
at Sai See Street Titself
the RCP and site in the demolition
2.2.12 The RCP adjacent to the CSTG in Cadogan Street
is a lightweight prefabricated structure that could be relocated if
necessary. However LCSD have commented
that the CSTG should remain open if at all possible to avoid the expense of
reprovisioning. The retention of the RCP
at its present location may not necessarily be the most convenient arrangement
for the demolition (as it would mean retaining the access along Sai See Street). However, the access road and RCP area should
be able to be excised from the demolition site without major inconvenience to
the demolition process. As there are no
buildings immediately adjacent to the RCP routine procedures and precautionary
measures carried out in line with the Draft Code of Practice for Demolition of
Buildings (DCDB, Buildings Department 1998) will avoid impacts on the operation
of the RCP. This can take place within
the routine for good overall project management of a demolition under the Hong Kong guidelines.
access must be maintained for residential and commercial uses at Kennedy Town. There are potential concerns about the
potential impact of traffic to and from the demolition site on the local
Access must be
maintained for commercial uses at China Merchants Wharf and
Godown, the Kennedy Town public transport terminus, Victoria Public Mortuary, industrial
buildings, residences on Victoria
Road, the petrol station
on Victoria Road and the Island West Refuse Transfer Station.
Whereas the exact
volume of waste to be disposed of has not yet been determined, estimates
indicate that up to about forty lorries per day would
be required. Therefore it is estimated
that during the peak of demolition process fewer than ten heavy vehicles per
hour would be required to remove waste from the Site. It is considered that this level of
additional traffic could be absorbed into the surrounding network without
significant impact (Section 6.4.1 refers).
method would be to use . H,
vessels accessing the pier at China Merchants Wharf and Cadogan Street
wharves and interference to the Victoria Harbour marine
traffic must be minimised.Marine
Department indicated that it would be preferable to avoid impacts in this busy
marine area. As Access must be assessments
indicate that additional waste disposal vehicles
could be absorbed into the surrounding road networkwithout
undue inconvenience, marine access Although local a , it has
been suggested that barges could be used to remove waste in order to reduce overall
road traffic impacts. Such a proposal would require a Marine Traffic
Impact Assessments (MTIA) and is outwith the SB
alignment for Route 7 and the extent of the Kennedy Town Developments are
currently under review but at present the programme of these developments is
unlikely to be advanced before the target completion date for demolition of
KTCDA. At this stage these proposals are
not thought to have any impact on the Project.
The draft Code of
Practice for Demolition of Buildings (DCDB, Buildings Department 1998)
identifies several main methods of techniques for demolition including:
Top down methods by jack
hammer, percussive or hydraulic breakers;
Saw Cutting and Drilling;
explosive demolition agents (NEDA);
Thermal lance; and
Implosive Methods (blasting)
not offer any potential reduction in polluting impacts in the form of noise,
vibration and dust (DCDB) and is not efficient for slabs and walls that will
require demolition at KTCDA. Site
investigations have shown asbestos containing materials (ACM) are present at
KTCDA (Section 3). Therefore the
preferred method of demolition should adopt non-blasting approach and implosive
demolition using a blasting approach has been ruled out as an option for
demolition. The asbestos investigation
and abatement plans are described in detail in the dedicated Asbestos Study
are applicable and efficient for all types of structure. Typical jack-hammers can reduce vibration and
hydraulic breakers can reduce noise (ref. DCDB). However, machine mounted percussive breakers
and toppling or breaking away structures by large machinery do not offer any
potential reduction in dust, noise or vibration emissions (DCDB). Whereas these methods may not be used
exclusively, in order to assume a worst case scenario, a variety of these
typical methods can be assumed to be used at KTCDA.
This method is
generally suitable for dilapidated buildings but would not be applicable in
this case where the clear space to the edge of the Site is limited in places
and structures have substantial steel reinforcement.
polluting impacts in the form of noise, vibration and dust can be reduced by
using methods such as circular saw cutting, wire saw cutting, and stitch
drilling which are effective for all structures and can reduce vibration, noise
and dust. Non explosive demolition agent
(NEDA) can also reduce vibration, noise and dust but is not applicable to slabs
and walls. The use of thermal lance and
or high-pressure water jets would not generally be recommended unless there are
no other viable alternatives. Whereas a
selection of the above processes may be used by the demolition contractor for
specific locations, these methods would generally result in lesser impacts
(DCDB) and their use should not be precluded by limiting plant to be used on
Site to that used in the assessments.
However for the purpose of the environmental assessment these techniques
are not assumed to be adopted in order that a worst possible case scenario is
choice of demolition methods for the marine reception platforms and piers is
top down method using saw cutting and lifting, in line with the DCDB, which
will avoid the disturbance of any marine mud.
demolition methodology is discussed in full in Appendix A. A variety of top-down methods are assumed to
be used and various articles from a suite of powered mechanical equipment has
been assumed to be in use at various locations across the Site throughout the
demolition. The use of jack-hammers and
hydraulic breakers is efficient and noise and dust impacts can potentially be
controlled by a range of practical mitigation measures (e.g. noise barriers,
dust control) familiar to the construction industry in Hong Kong. In addition, the statutory provisions under
the Noise Control Ordinance and Air Pollution Control Ordinance control noise
and dust from such operations. Due to
the presence of ACM the preferred method of demolition must adopt non-explosive
approach. The asbestos investigation and
abatement plans are described in detail in the dedicated Asbestos Study Report
that has been reviewed by EPD.
Removal of Waste
The options for
removal of waste relevant to this Site include use of marine barges and
The use of barges
could reduce overall road traffic impacts, however loading at the waterfront
would introduce the possibility of dust and waste being dropped into the
sea. Whereas there are reception piers
at the waterfront which could be used as barging points the potential for loss
of waste and consequent water pollution from these sources can be eradicated by
the use of other means to transport waste.
Such access would also be complicated by the need to avoid v