This section presents the waste management
implications of the construction and operational phases of the Project.
8.2
Relevant Assessment Criteria, Legislation and
Guidelines
The assessment was undertaken in accordance with the
criteria presented in Annexes 7 and 15 of the EIAO-TM, which are summarised as follows:
·
Evaluate
opportunities to reduce, reuse and recycle waste;
·
Estimate
the types and quantities of the wastes to be generated; and
·
Assess
the secondary environmental impacts due to the management of waste with respect
to potential hazards, air and odour emissions, noise, wastewater discharges and
traffic.
In addition, the following legislation covering or
having some bearing upon, the handling, treatment and disposal of wastes in
·
Waste
Disposal Ordinance (Cap 354);
·
Waste
Disposal (Chemical Waste) (General) Regulation (Cap 354C);
·
Land
(Miscellaneous Provisions) Ordinance (Cap 28)
·
Public
Health and Municipal Services Ordinance (Cap 132) - Public Cleansing and
Prevention of Nuisances Regulation; and
·
Dumping
at Sea Ordinance (Cap 466).
The Waste
Disposal (Charges for Disposal of Construction Waste) Regulation under the Waste Disposal Ordinance defines
construction waste as any substance, matter nor things that is generated from
construction work and abandoned, whether or not it has been processed or
stockpiled before being abandoned, but does not include any sludge, screening
or matter removed in or generated from any desludging,
desilting or dredging works.
The main contractor who undertakes construction work
under a contract with value of $1 million or above is required to open a
billing account solely for the contract.
Application should be made within 21 days after the contract is
awarded. Failing this will be an offence
under the law.
For construction work under a contract with value
less than $1 million, such as minor construction or renovation work, any person
such as the owner of the premises where the construction work takes place or
his/her contractor can open a billing account; the account can also be used for
contracts each with value less than $1 million.
The premises owner concerned may also engage a contractor with a valid
billing account to make arrangement for disposal of construction waste.
Any person needs to open an account before using
waste disposal facilities for disposal of construction waste.
Depending on the percentage of inert materials in the
construction waste, construction waste can be disposed at public fill, sorting
facilities, landfills and outlying islands transfer facilities where different
disposal cost would be applied. The
scheme encourages reduction, reuse and sorting of construction waste such that
the waste producer can minimise their disposal fee. Table
8.1 summarises the government construction waste disposal facilities, types
of waste accepted and disposal cost.
Table 8.1 Level of Charges at Different Government Waste Disposal Facilities for Construction Waste
|
Government
Waste Disposal Facilities |
Type
of Construction Waste Accepted |
Charge
Per Tonne |
|
Public fill reception facilities
|
Consisting entirely of
inert construction waste |
$27 |
|
Sorting facilities |
Containing more than 50%
by weight of inert construction waste |
$100 |
|
Landfills |
Containing not more than
50% by weight of inert construction waste |
$125 |
|
Outlying |
Containing any percentage
of inert construction waste |
$125 |
Other 'guideline' documents which detail how the
Contractor should comply with the regulations are as follows:
·
Waste
Disposal Plan for Hong Kong (December 1989), Planning,
Environment and Lands Branch Government Secretariat,
·
Chapter 9
Environment (1999), Hong Kong Planning Standards and
Guidelines,
·
New
Disposal Arrangements for Construction Waste (1992), EPD
& CED,
·
Code
of Practice on the Packaging, Labelling and Storage of Chemical Wastes
(1992), EPD,
·
Works
Branch Technical Circular (WBTC) No. 32/92, The Use of Tropical Hard Wood on
Construction Site; Works Branch,
·
WBTC
No. 2/93B, Public Filling Facilities, Works
Branch,
·
WBTC
Nos. 4/98 and
4/98A, Use of Public Fill in Reclamation and Earth Filling Projects; Works
Bureau,
·
Waste
Reduction Framework Plan, 1998 to 2007,
Planning, Environment and Lands Bureau, Government Secretariat, 5 November
1998;
·
WBTC
Nos. 25/99, 25/99A and
25/99C, Incorporation of Information on Construction and Demolition Material
Management in Public Works Sub-committee Papers; Works Bureau,
·
WBTC
No. 12/2000, Fill Management; Works Bureau,
·
WBTC
No. 19/2001, Metallic Site Hoardings and Signboards; Works
Bureau,
·
WBTC
Nos. 6/2002 and
6/2002A, Enhanced Specification for Site Cleanliness
and Tidiness. Works Bureau,
·
WBTC
No. 12/2002, Specification Facilitating the Use of Recycled Aggregates. Works
Bureau,
·
ETWBTC
No. 33/2002, Management of Construction and Demolition Material Including Rock; Environment, Transport and Works
Bureau,
·
DEVB
TC(W) No.6/2010, Trip Ticket System for Disposal of Construction &
Demolition Materials, Development Bureau,
·
ETWBTC
No. 19/2005, Environmental Management of Construction Site,
Environment, Transport and Works Bureau,
8.3
Waste Management Assessment
8.3.1
Ecological Reserve
Enhancement
Works
The enhancement works will include
installation of drop bar at the road entrance to Sha Lo Tung Valley, weed
removal, enhancement planting, marsh restoration, plantation, trail
enhancement, and provision of signage.
In addition, the existing damaged footpaths alongside the natural
streams will be maintained and enhanced manually (natural stones but not
concrete will be used). A temporary
footbridge will be constructed across the stream within the Sha Lo Tung Stream
SSSI (please refer to Section 3.2.3
for detail). Minor excavation for the
construction of bridge footing is required.
It is estimated that about 1.1 m3 of C&D materials will
be generated from the footing construction.
About 0.4 m3 of this material will be reused as backfilling
onsite and the rest will be reused in other work sites of the Project
as far as practical or, as a
last resort, delivered to a public fill reception facility for beneficial reuse
in other projects. In view of the small
quantity of C&DM to be generated, no adverse impact is anticipated.
Green waste will be generated and with the
implementation of good waste management and on-site waste minimisation
practices as recommended in Section 8.4,
no adverse impact associated with the management of green waste is expected.
Maintenance
and Operation
Limited green waste will be generated during the
maintenance and operation for the ecological reserve. With the implementation of good waste
management as recommended in Section 8.4,
no impact associated with the management of green waste is expected.
8.3.2
Development Site
Construction
Phase
Waste to be generated from the construction of the
Development Site will comprise construction and demolition (C&D) materials ([1]), chemical waste and general refuse.
Construction works include site formation,
slope stabilization, civil works and building construction. The construction works (including site
formation and superstructure works) for the Development Site are expected to
last for 16 months in total. The site
formation works will be carried out in three stages. The detailed site formation works in each
stage have been described in Section 3.
The site formation works for Stages 1, 2 and 3 will last for 5 months, 5
months and 6 months, respectively. A
total of approximately 16,100 m3 of soft materials will be generated
from excavation. The in-situ excavated
materials will be reused for the backfilling, and the cutting and filling
activities for the site formation and slope works will be planned and arranged
in such a way that the requirement for stockpiling will be minimised.
Should there be any requirement for the temporary
storage of excavated materials destined for reuse within the Project, the
stockpile of such materials will be placed within a designated area measuring
about 3m x 20m in the southern part of the Development Site (Figure 3.11).
The designated stockpile area will occupy a proposed cut platform formed
within the first phase works area and is located at a substantial distance of
320 m from Sha Lo Tung SSSI and streams.
The area will be provided with concrete paving, concrete bunds and
interceptor drains along its perimeter to prevent the loss of materials such as
soil, silt or debris to the surrounding area.
The stockpile will also be covered with tarpaulin or similar impermeable
covering materials during rainstorms to ensure that no impact on the water
gathering ground, Sha Lo Tung
SSSI and streams will arise. All unavoidable surplus excavated materials
will be removed from the works area and delivered by truck on a regular basis
to one of the Government’s public fill reception facilities, eg Tuen Mun
Area 38 Fill Bank, for beneficial reuse in other projects.
To establish the worst case scenario,
the following assessment is based on the assumption of no materials reuse
on-site. However, some materials will be
reused on-site as much as possible. The
rate of excavated soil generation will be low (ie 134
m3/day on average ([2])).
Even if a peak factor of 2 is applied to cater for the potential
increase in spoil generation during the overlapping of two stages, the
estimated peak volume of spoil to be generated will only be about 268 m3
per day. Assuming a capacity of 7.5 m3
per truck and a bulk factor of soil of 1.2, about 4 to 5 trucks will be
required per hour (assuming 10 working hours a day) to dispose of the spoil at
public filling facilities.
A total of approximately 7,600 m3
of soft materials will be required to fill the land up to the required
level. The daily filling rate will be
about 63 m3 per day on average.
Assuming a capacity of 7.5 m3 per truck and a bulk factor of
soil of 1.2, about 1 truck per hour (assuming 10 working hours a day) will be
required to import the fill materials.
It should be noted that the trucks will only travel
along the improved
The total Gross Floor Area (GFA) of new
building structures to be constructed, including Nature Interpretation Centre,
Multi-Cultural Education Retreat, staff quarters, columbarium structures and
open carparks, is about 14,900 m2. All buildings will be constructed of
reinforced concrete. Based on a
generation rate of 0.1 m3 per m2 of GFA constructed ([3]), it is estimated that a total of about
1,490 m3 of C&D materials will be generated. These materials should be sorted on-site into
public fill (inert portion) (about 1,192 m3) and non-inert
construction waste (298 m3) ([4]) to minimise the amount of construction waste
to be disposed of at landfills and the cost for disposal of the construction
waste arising from the Project. The
inert C&D materials will be sent to public fill reception area for
beneficial reuse in other projects.
The handling and transportation of C&D materials
have the potential to cause adverse dust, noise and water quality impacts if
not properly managed. In view of the
small quantity of C&D materials generated and with the implementation of
good site practices recommended in Sections
5, 6 and 7, water quality, dust and noise impacts are not expected.
With the limited size of the works area, the number
of construction equipment used on site will be limited, and therefore only a
limited quantity of chemical waste is expected to be generated from the
maintenance of construction equipment (for example, waste lubricant oil). With the incorporation of suitable
arrangements for the storage, handling, transportation and disposal of chemical
wastes in an appropriate manner as outlined in the Waste Disposal (Chemical
Waste) (General) Regulation and the requirements stated in the Code of Practice
on the Packaging, Labelling and Storage of Chemical Waste, no adverse
environmental and health impacts will result from the handling, transportation
and disposal of chemical waste arising from the Project.
The amount of general refuse generated by the
construction workforce is expected to be small owing to the limited number of
workers to be deployed on-site. General
refuse should be stored and disposed of separately from general construction
waste and chemical waste. The storage
bins for general refuse should be provided with lids which should be kept
closed to avoid odour and wind-blown litter.
Provided that general refuse is removed from the site regularly (at
least once per day) and disposed of at the nearest refuse transfer stations or
directly to landfill, no adverse environmental impact related to handling and
disposal of general refuse is expected.
With the implementation of good waste management and
on-site waste minimisation practices as recommended in Section 8.4, adverse impact associated with the management of
construction waste is not expected.
Operational
Phase
The types of waste that may be generated during the
operation of the Project include general refuse and chemical waste.
General refuse will arise from the resident monks,
visiting monks, local devotees, visitors who worship their ancestors
(especially during public holidays and festival holidays) and administrative
activities. General refuse may consist
of food waste, plastics, aluminium cans and waste paper. Recyclable materials (i.e. paper, plastic
bottles and aluminium cans) should be separated and delivered to recyclers to
minimize the amount of general refuse to be disposed of. The non-recyclable general refuse will be
disposed of to the nearest refuse transfer station or directly to landfill on a
regular basis. With respect to the small
quantity of general refuse to be disposed of, no adverse environmental impact
associated with the handling and disposal of the refuse is anticipated.
During the operation of the columbarium, burning of
effigies and paper offerings in the Development Site (including the
columbarium, multi-cultural education retreat and open space) is not
allowed. No fertilizers, pesticides or
herbicides will be used in the Site.
Small quantities of chemical wastes including paints, varnishes and the
like for application to steel, timber and plywood formwork, concrete additives,
solvents and thinners, adhesive, bituminous compounds and tars will be produced
and these chemical wastes should be stored, handled, transported and disposed
of in accordance with the Chemical Waste
Regulations, Code of Practice on Packaging, Labelling and Storage of Chemical
Waste and A Guide to the Chemical
Waste Control Scheme. Chemical waste
should be collected and transported to the Chemical Waste Treatment Facility or
other licensed facility by a registered waste hauler. Provided that appropriate handling, storage
and disposal procedures are followed, no adverse impact associated with the
management of chemical waste during the operational phase is envisaged.
8.3.3
Sha Lo
Construction
Phase
Waste to be generated from the improvement of
The improvement works of
The road improvement works will be divided
into three phases. The three phases will
each cover a road section measuring approximately 800 m in length and will each
take approximately six to seven months to complete. The three phases of the road improvement
works will be undertaken in consecutive sequence with some overlap between
phases. It is envisaged that the slope
works will not require more than the 7-month duration of a single dry season to
minimize fugitive dust emission and ecological impacts. A total of 11,000 m3 of soil will
be excavated over the 19-month construction period. It is estimated that about 20 m3
of soil will be generated per day ([5]).
Even if a peak factor of 2 is applied to cater for the potential
increase in spoil generation during the overlapping of two phases, the
estimated peak volume of spoil to be generated per day (ie
40 m3) is still considered small.
The excavated soil will be reused onsite as far as practical. All unavoidable surplus excavated materials
will be removed from the works area and, as a last resort, delivered by truck
to one of the Government’s public fill reception facilities. Assuming a capacity of 7.5 m3 per
truck and a bulk factor of 1.2, about 7 trucks per day will therefore be
required to dispose of spoil at public filling facilities.
A small volume of fill materials (ie, 1,000 m3) will be required. In case the excavated soil cannot be reused
as fill material onsite, additional fill material will be imported to the
Site. Assuming 24 working days a month,
a capacity of 7.5 m3 per truck and a bulk factor of 1.2, the filling
rate, on average, will be 2 m3 per day and about 1 truck will be
required to import the fill materials.
With such a small number of truck trips generated,
the effect on the existing traffic on
Segregation should be performed on site to separate
the public fill for disposal at public filling facilities and the non-inert
construction waste for disposal at nearby refuse transfer station or directly
to landfill.
The handling and transportation of C&D materials
arising from road improvement works have the potential to cause adverse dust,
noise and water quality impacts if not properly managed. In view of the small quantity of construction
waste generated and with the implementation of good site practices recommended
in Sections 5, 6 and 7, water quality, dust and noise
impacts are not expected.
A small quantity of chemical waste will be generated
by the maintenance of construction equipment (for example, waste lubricant
oil). The number of construction
equipment used on site is expected to be limited and chemical wastes will be
handled and disposed of in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical
Waste, and therefore adverse environmental impacts are not expected.
The amount of general refuse generated by the
construction workforce is expected to be small due to the limited number of
workers to be deployed on-site. General
refuse will be stored and disposed of separately from general construction waste
and chemical waste. Provided that general
refuse is removed from the site regularly (at least once per day) and disposed
of at the nearest refuse collection point, no adverse environmental impact
related to handling and disposal of general refuse is expected.
With the implementation of good waste management and
on-site waste minimisation practices as recommended in Section 8.4, adverse impact associated with the management of
construction waste is not expected.
8.3.4
Cumulative Impacts
Construction
Phase
According to the construction programme, the
construction works of ecological reserves, development site and road
improvement would not cause cumulative dust impact.
No other concurrent projects were also identified in
the vicinity to cause cumulative dust impact.
Operational
Phase
No cumulative impact is anticipated.
8.4.1
Waste Management Hierarchy
The various waste management options are categorised
in terms of preference from an environmental viewpoint. The options considered to be most preferable have
the least environmental impacts and are more sustainable in the long term. The hierarchy is as follows:
·
Avoidance
and reduction;
·
Reuse
of materials;
·
Recovery
and recycling; and
·
Treatment
and disposal.
The above hierarchy has been used to evaluate and
select waste management options in the follow sections.
8.4.2
Ecological Reserve
Enhancement
Works and Maintenance and Operation
Potential waste impacts can be minimised through the
implementation of good site management programme including the following
mitigation measures:
·
Wastes
should be handled and stored in a manner which ensures that they are held
securely without loss or leakage, thereby minimising the potential for
pollution;
·
Appropriate
measures should be employed to minimise windblown litter and dust during
transportation by either covering trucks or transporting wastes in enclosed
containers; and,
·
Temporary
green waste storage areas should be well maintained and cleaned regularly.
8.4.3
Construction Phase of Development Site and
Sha Lo
Potential waste impacts can be minimised through the
implementation of good site management programme including the following
mitigation measures:
·
The in-situ excavated materials should be optimised
for reuse in backfilling during detailed design stage.
·
The
cutting and filling activities for the site formation and slope works should be
planned and arranged in such a way that the requirement for stockpiling will be
minimized.
·
Should
there be any requirement for the temporary storage of excavated materials
destined for reuse within the Project, the stockpile of such materials will be
placed within a designated area measuring about 3m x 20m in the southern part
of the Development Site (Figure 3.11). The designated stockpile area will occupy a
proposed cut platform formed within the first phase works area and is located
at a substantial distance of 320 m from Sha Lo Tung SSSI and streams. The area will be provided with concrete
paving, concrete bunds and interceptor drains along its perimeter to prevent
the loss of materials such as soil, silt or debris to the surrounding
area. The stockpile will also be covered
with tarpaulin or similar impermeable covering materials during rainstorms to
ensure that no impact on the water gathering ground, Sha Lo Tung SSSI and
streams will arise. All unavoidable
surplus excavated materials will be removed from the works area and delivered
by truck on a regular basis to one of the Government’s public fill reception
facilities, eg Tuen Mun Area 38 Fill Bank.
The Contractor should consult the EPD (and CEDD) for the final disposal
of wastes.
·
Good
management and control can prevent generation of significant amount of
waste. Waste reduction is best achieved
at the planning and design stage, as well as by ensuring the implementation of
good site practices. Recommendations to
achieve waste reduction include:
-
Segregation
and storage of different types of waste in different containers, skips or
stockpiles to enhance reuse or recycling of material and their proper disposal;
-
Encourage
collection of aluminium cans and waste paper by individual collectors during construction
with separate labelled bins being provided to allow the segregation of these
wastes from other general refuse generated by the workforce;
-
Any
unused chemicals and those with remaining functional capacity be recycled as
far as possible;
-
Use
of reusable non-timber formwork to reduce the amount of C&D materials;
-
Prior
to disposal of construction waste, wood, steel and other metals should be
separated, to the extent practical for re-use and/or recycling to reduce the
quantity of waste to be disposed at landfills;
-
Proper
storage and site practices to reduce the potential for damage or contamination
of construction materials; and
-
Plan
and stock construction materials carefully to reduce amount of waste generated
and avoid unnecessary generation of waste.
·
Wastes
should be handled and stored in a manner which ensures that they are held
securely without loss or leakage thereby minimising the potential for
pollution.
·
Only
reputable waste collectors authorised to collect the specific category of waste
concerned should be employed.
·
Appropriate
measures should be employed to minimise windblown litter and dust during
transportation by either covering trucks or transporting wastes in enclosed
containers.
·
The
necessary waste disposal permits should be obtained from the appropriate
authorities, if they are required, in accordance with the Waste Disposal Ordinance Cap
354, Waste Disposal (Chemical
Waste) (General) Regulation Cap
354 and the Land (Miscellaneous
Provision) Ordinance Cap 28.
·
Chemical
waste shall be handled and stored in accordance with the Code of Practice on
the Packaging, Labelling and Storage of Chemical Wastes to minimise any
danger to health of risk and pollution to the environment. Under the Chemical
Waste Regulations, all producers of chemical waste should register with EPD.
·
Collection
of general refuse should be carried out frequently, preferably daily.
·
Waste
should only be disposed of at licensed sites, and site staff and the Contractor
should develop procedures to ensure that illegal disposal of wastes does not
occur.
·
Waste
storage areas should be well maintained and cleaned regularly.
·
Records
of the quantities of wastes generated, recycled and disposed, determined by
weighing each load or other method, should be maintained to check whether any
targets for waste recycling, reduction etc are being met.
·
Training
and instruction of construction staff should be given at the site to increase
awareness and draw attention to waste management issues and the need to
minimise waste generation.
·
The Construction Waste Disposal Charging
Scheme was launched on 1
December 2005 and the charging for disposal of construction waste commenced on
20 January 2006. Through the Charging
Scheme, construction waste producers (i.e. contractors) are encouraged to
reduce, sort and recycle construction waste, in particular the wood materials,
so that their disposal costs can be minimised and valuable landfill space can
be preserved.
·
The
Contractor should separate public fill from non-inert construction waste for
disposal at appropriate locations and to sort the construction waste by
category on-site to facilitate reuse/recycling and reduce the quantity of waste
to be disposed of. The Contractor will
be required to break down any over-sized public fill to less than 250 mm in
size for disposal so as to facilitate its re-use by other reclamation or
earth-filling projects.
·
A
trip-ticket system (TTS) will also be established in accordance with Development
Bureau Technical Circular No.6/2010 to monitor the disposal of construction waste at the Tuen
Mun Area 38 Fill Bank or other approved designated
public fill facilities, and to control fly-tipping. The trip-ticket system will be included as
one of the contractual requirements and implemented by the contractor.
·
In
order to fully implement the TTS, it is recommended that warning signs should
be put up at all vehicle accesses to remind the drivers of dump truck of the
proper designated disposal outlet and the penalties of offence. Close-circuited television (CCTV) is
recommended to be installed at the access points to monitor and prevent illegal
dumping, especially during night time.
Site fences should be installed to prevent illegal dumping at non-designated
area within the Site.
·
A
Waste Management Plan (WMP) as a part of Environmental Management Plan (EMP)
should be prepared by the Contractor prior to the commencement of construction
as part of the contractual requirement.
The WMP should be prepared in accordance with ETWB TCW No. 19/2005 which describes the arrangements for
avoidance, reuse, recovery, recycling, storage, collection, treatment and
disposal of different categories of waste to be generated from the construction
activities. The plan should incorporate
site-specific factors, such as the designation of areas for the segregation and
temporary storage of reusable and recyclable materials. The Contractor should implement the waste
management practices in the WMP throughout the construction stage of the
Project. The WMP should be reviewed
regularly and updated by the Contractor, preferably in a monthly basis, to
incorporate any revisions, measures or suggestions discovered during the
construction periods for implementation
8.4.4
Operational Phase of the Development Site
Potential waste impacts can be minimised through the
implementation of waste management program including the following mitigation
measures:
·
Waste
reduction and minimisation should be considered at the planning and design
stage.
·
Different
types of wastes (i.e. general refuse and office waste) should be segregated and
stored separately.
·
Wastes
should be handled and stored in a manner which ensures that they are held
securely without loss or leakage thereby minimising the potential for
pollution.
·
The
necessary waste disposal permits should be obtained from the appropriate
authorities, if they are required, in accordance with the Waste Disposal Ordinance Cap
354, Waste Disposal (Chemical
Waste) (General) Regulation Cap
354 and the Land (Miscellaneous
Provision) Ordinance Cap 28;
·
Collection
of general refuse should be carried out on a daily basis.
·
General
refuse should be collected from lidded bins and delivered to a central
collection point and should be stored in enclosed containers to prevent odour,
windblown litter, vermin, water pollution and visual impacts.
·
A
properly constructed covered refused collection point that is bunded and drained to the sewerage system should be
provided.
·
Waste
should only be disposed of at licensed sites.
The Contractor should develop procedures to ensure that illegal disposal
of wastes does not occur.
·
Waste
storage areas should be well maintained and cleaned at least once a day.
·
Separation
of recyclables from the waste stream should be encouraged and may occur before
or after the delivery of the wastes to the central collection point.
·
Chemical
waste should be handled in accordance with Chemical
Waste Regulations and the Code of
Practice on the Packaging, Labelling and Storage of Chemical Waste. Chemical waste should be placed in approved
containers, stored in a secure area and sent to a facility licensed to receive
chemical waste by the EPD, such as the Clinical Waste Treatment Centre in Tsing Yi. Under the Chemical Waste Regulations, all
producers of chemical waste should register with the EPD.
·
Training
and instruction of staff should be given to increase awareness and draw
attention to waste management issues and the need to minimise waste generation.
8.5.1
Ecological Reserve
No adverse residual impacts are anticipated during
both construction and operational phases.
8.5.2
Development Site
No adverse residual impacts are anticipated during
both construction and operational phases.
8.5.3
Road Improvement Works
No adverse residual impacts are anticipated during
both construction and operational phases.
8.6
Environmental and Audit Requirement
8.6.1
Ecological Reserve
Regular environmental inspections and audits should
be performed to ensure the implementation of proposed mitigation measures. Full details of the daily inspection and
audit requirements during construction are presented in Section 12.
8.6.2
Development Site
Regular environmental inspection and audit should be
performed to ensure the implementation of proposed mitigation measures during
both construction and operational phases.
8.6.3
Road Improvement Works
Regular environmental inspection and audit should be
performed to ensure the implementation of proposed mitigation measures during
construction phase.
8.7.1
Ecological Reserve
The enhancement works will include
installation of a drop bar at the road entrance to Sha Lo Tung Valley, weed removal,
enhancement planting, marsh restoration, plantation, trail enhancement,
provision of signage and enhancing the existing damaged footpath alongside the
natural streams. A temporary footbridge
will be constructed across the stream within the Sha Lo Tung Stream SSSI. Minor excavation for the construction of the
bridge footing will be required. It is
estimated that about 1.1 m3 of C&D materials will be generated
from the footing construction. About 0.4
m3 of this material will be reused as backfilling onsite and the
rest will be disposed offsite at the appropriately waste reception facility. Green waste will be generated.
With the implementation of good waste management and on-site waste
minimisation practices as recommended in Section
8.4, no adverse impact associated with the management of green waste is
expected.
Limited green waste will be generated during the
maintenance and operation of the ecological reserve. With the implementation of good waste
management as recommended in Section 8.4,
no adverse impact associated with the management of green waste is expected.
8.7.2
Development Site
Approximately 16,100 m3 of
inert soft materials will be excavated during site formation and approximately
7,600 m3 of public fill are required for filling to the required
level. The in-situ excavated materials
will be reused for the backfilling, and the cutting and filling activities for
the site formation and slope works will be planned and arranged in such a way
that the requirement for stockpiling will be minimised. The waste management assessment is based on
the worst case scenario assuming there is no reuse of materials on-site. The average rate of excavated soil generation
and filling rate will be low (ie 134
m3/day and 63 m3/day, respectively). Assuming 10 working hours a day about 4 to 5
trucks and 1 trucks will be required per hour on average (considered as worst
case scenario as some materials will be reused on-site as much as possible)
to dispose to public filling facilities and to import fill materials,
respectively. It should be noted that
the trucks will only travel along the improved
Limited quantities of general refuse and chemical
wastes are expected to be generated during the operation of the Nature
Interpretation Centre, Multi-Cultural Education Retreat cum Columbarium. With good site practices, the potential
environmental impacts associated with the storage, handling, collection,
transport and disposal of a small quantity of general refuse and chemical
wastes arising from the operation of the Multi-Cultural Education Retreat will
meet the relevant EIAO-TM criteria
and no adverse impact associated with waste management is anticipated.
8.7.3
Road Improvement Works
The road improvement works will be divided
into three phases. The three phases of
the road improvement works will be undertaken in consecutive sequence with some
overlap between phases. A total of
11,000 m3 of soil will be excavated over the 19-month construction
period. About 20m3 of soil is
estimated to be generated per day. Even
if a peak factor of 2 is applied to cater for the potential increase in spoil
generation during the overlapping of two phases, the estimated peak volume of
spoil to be generated per day (ie 40 m3)
is still considered small. Assuming a
capacity of 7.5 m3 per truck and a bulk factor of 1.2, about 7
trucks per day will be required to dispose to public filling facilities. A small volume of fill materials (ie, 1,000 m3) will be required. Assuming 24 working days a month, a capacity
of 7.5 m3 per truck and a bulk factor of 1.2, the filling rate, on
average, will be 2 m3 per day and about 1 truck will be required to
import the fill materials. With such a
small number of truck trips generated, the effect on the existing traffic on
Chemical waste generated from maintenance of
construction equipment will be generated during the construction phase. Given the implementation of the recommended
mitigation measures, no adverse environmental impact is expected during the
construction phase.