6.1
Introduction
6.1.1.1
This
section identifies the types of wastes that are likely to be generated during
the construction and operation of the Project and evaluates the potential
environmental impacts that may result from the handling,
transport and disposal of these wastes.
6.1.1.2
Mitigation
measures and good site practices regarding waste handling, storage, collection
and disposal have been recommended with reference to the criteria and
guidelines as stated in the requirements given in Section 3.4.7 and Appendix E of the EIA
Study Brief, as well as Annexes 7 and 15 of the Technical Memorandum on Environmental Impact
Assessment Process (EIAO-TM) and
relevant waste legislation and guidelines.
6.2.1.2
The
following legislation also covers the handling, treatment and disposal of
wastes in the Hong Kong Special Administrative Region (HKSAR):
l Waste
Disposal Ordinance (Cap. 354);
l Waste
Disposal (Chemical Waste) (General) Regulation (Cap. 354C);
l Waste
Disposal (Charges for Disposal of Construction Waste) Regulation (Cap. 354N);
l Land
(Miscellaneous Provisions) Ordinance (Cap. 28);
l Public
Health and Municipal Services Ordinance (Cap. 132) – Public Cleansing and
Prevention of Nuisances Regulation; and
l Air
Pollution Control Ordinance (Cap. 311).
Waste Disposal
Ordinance
6.2.1.3
The
Waste Disposal Ordinance (WDO) (Cap. 354)
prohibits any unauthorised disposal of waste. Construction waste defined under Cap. 354N of
the WDO, refers to a substance,
matter or thing which is generated from construction works. It includes all abandoned materials, whether
processed or stockpiled or not, before being abandoned, but does not include
sludge, screenings or matter removed or generated from desludging, desilting or
dredging works. Under the WDO, waste can be disposed of only at
designated waste disposal facilities licensed by EPD.
Waste Disposal (Chemical Waste) (General) Regulation
6.2.1.4
Under
the WDO, the Chemical Waste (General)
Regulation (Cap. 354C) provides regulations for chemical waste control, and
administers the possession, storage, collection, transport and disposal of
chemical wastes. EPD has also issued
three statutory guidelines: A Guide to the Chemical Waste Control Scheme
(2016) to introduce and explain the legislative controls over the
management of chemical waste in Hong Kong; A
Guide to the Registration of Chemical Waste Producers (2016) to introduce
the registration provisions of the Waste Disposal (Chemical Waste)(General)
Regulation (the Regulation) and the procedure for identifying chemical waste
generation; and the Code of Practice on
the Packaging, Labelling and Storage of Chemical Wastes (1992), which
details how the chemical waste producers should comply with the regulations on
chemical waste.
Waste Disposal (Charges for Disposal of Construction Waste)
Regulation
6.2.1.5
Under
the Waste Disposal (Charges for Disposal
of Construction Waste) Regulation (Cap.
354N), construction waste delivered to a landfill for disposal must
not contain more than 50% by weight of inert material. Construction waste delivered to a sorting
facility for disposal must contain more than 50% by weight of inert material,
and construction waste delivered to a Public Fill Reception Facilities (PFRF)
for disposal must consist entirely of inert material.
Land (Miscellaneous Provisions) Ordinance
6.2.1.6
The
inert portion of construction and demolition (C&D) materials (including rocks,
soil, broken concrete, building debris, etc.) may be taken to public filling
facilities including public filling area, public filling barging points and
stockpiling areas. These facilities
usually form part of land reclamation schemes and are operated by Civil
Engineering & Development Department (CEDD). The Land (Miscellaneous Provisions)
Ordinance (Cap. 28) requires that individuals or companies who deliver
public fill to the public filling facilities are required to obtain Dumping
Licences. The licences are issued by
CEDD under delegated authority from the Director of Lands.
Public Health and Municipal Services Ordinance
6.2.1.7
The Public Cleansing and
Prevention of Nuisances Regulation
(Cap. 132)
under the Public Health and Municipal Services
Ordinance provides
control on dumping of litter in public places.
Other Relevant Guidelines
6.2.1.8
Other
relevant circulars / guidelines are applicable to waste management practices
for the Project include:
l Code
of Practice on the Packaging, Labelling and Storage of Chemical Wastes (1992),
EPD;
l A
Guide to the Chemical Waste Control Scheme (EPD);
l A
Guide to the Registration of Chemical Waste Producers (EPD);
l Environment,
Transport and Works Bureau Technical Circular (Works) ETWB TC(W) No. 19/2005
‘Environmental Management on Construction Sites’;
l ETWB
TC(W) No. 34/2002, Management of Dredged / Excavated Sediment;
l Development
Bureau Technical Circular (Works) DEVB TC(W) No.06/2010 ‘Trip Ticket System for
Disposal of C&D Materials’;
l DEVB
TC(W) No. 2/2011 ‘Encouraging the Use of Recycled and other Green Materials in
Public Works Projects’;
l DEVB
TC(W) No. 9/2011 ‘Enhanced Control Measures for Management of Public Fill’;
l DEVB
TC(W) No. 08/2010 ‘Enhanced Specification for Site Cleanliness and Tidiness’;
l Works
Branch Technical Circular WBTC No. 2/93 ‘Public Dumps’;
l WBTC
No. 2/93B ‘Public Filling Facilities’;
l WBTC
No. 16/96 ‘Wet Soil in Public Dumps’;
l WBTC
No. 12/2000 ‘Fill Management’;
l WBTC
Nos. 25/99, 25/99A and 25/99C,
‘Incorporation of Information on Construction and Demolition Material
Management in Public Works Subcommittee Papers’;
l Project
Administration Handbook (PAH) for Civil Engineering Works, Section 4.1.3 of
Chapter 4, 2020 Edition; and
l CEDD
TC No. 11/2019 ‘Management of Construction and Demolition Materials’.
6.2.1.9
The
ETWB TC(W) No. 19/2005 on Environmental Management on Construction
Site includes procedures on waste management requiring contractors to
reduce the C&D materials to be disposed of during the course of
construction, The Project Administration
Handbook for Civil Engineering Works, Section 4.1.3 Management of Construction
and Demolition Material Including Rock published by CEDD to enhance the
management of C&D materials and to minimise their generation at
source. The enhancement measures include
drawing up a Construction and Demolition Material Management Plan (C&DMMP)
at an early design stage to minimise C&D materials generation and encourage
proper management of such materials.
Projects generating less than 50,000 m3 C&D materials or
importing less than 50,000 m3 of fill material are exempted from the
C&DMMP. Under
ETWB TC(W) No. 19/2005, the
Contractor is required to prepare and implement an Environmental Management
Plan (EMP) and the Waste Management Plan (WMP) becomes part of the EMP. The WMP will be submitted to the
Architect/Engineer for approval.
6.2.1.10
Under
DEVB TCW No. 6/2010 Trip Ticket System for Disposal of Construction and
Demolition Materials, for all contracts that are expected to generate inert
C&D materials requiring disposal from site, the project office shall write
to the Public Fill Committee (PFC) through Secretary of the PFC to request a designated
disposal ground for incorporation into the tender documents. For contracts where the estimated amount of
non-inert C&D materials requiring disposal at landfill facilities equals to
or exceeds 50 m3, the project office shall seek confirmation from
the DEP in terms of the availability of landfill facilities for disposal of
such materials and the DEP will designate landfill facilities, if available,
for the contracts. For contracts where
the estimated amount of non-inert C&D materials to be generated from the
contract is less than 50 m3, the project office is not required to
apply to DEP for designated landfill facilities but it should still specify in
the tender documents of the appropriate landfill facilities for disposal.
6.3
Assessment Methodology
6.3.1.1
The
assessment of waste management impacts arising from the construction and
operation activities of the Revitalisation of Tai Wai Nullah, has been
undertaken in accordance with the EIA Study Brief and criteria given in Annexes
7 and 15 of the EIAO-TM and includes
the following tasks:
l Identification
of the construction and operation activities of the Project which could give
rise to waste arising;
l Estimation
of types and quantities of waste generated;
l Examination
of opportunities for waste reduction and re-use (both on-site and off-site) and
the required disposal options for each waste;
l Evaluation
of potential impacts caused by improper handling, collection, transportation
and re-use / disposal of wastes with respect to potential hazards, air and
odour emissions, noise, wastewater discharges and public transport.
6.4.1.1
The
proposed revitalisation works include the following construction activities:
l Channel
Bed Modification;
l Improvement
of Existing Walkways and Riparian Public Open Spaces;
l Construction
of Dry Weather Flow Interceptor (DWFI) System;
l Landscaping
and Miscellaneous Works;
l Desilting
Works at Downstream Tidal Zone;
l Construction
of Mid-stream Underground Water Pumps for Ecological Enhancement-Associated
Water Retention and Supplement
6.4.1.2
The
types of waste associated with these construction activities include:
l C&D
materials;
l Desilted
materials from desilting;
l Chemical
waste; and
l General
refuse
C&D Materials
6.4.1.3
C&D
materials would be generated from the channel bed modification, improvement of
existing walkways and riparian public open space, landscaping and miscellaneous
works, construction of DWFI system and mid-stream underground water pumps. The C&D materials would both comprise
inert C&D materials (e.g. soil, rock and concrete, etc.) and non-inert
C&D materials (e.g. timber, paper, etc.) generated. Based on the current latest design
information, it is estimated a total of approximately 122,000 m³ of C&D
materials would be generated during construction phase. A summary of the C&D materials estimates
during construction phase is shown in Table
6.1.
6.4.1.4
The
inert C&D materials should be reused on-site as far as possible to minimise
the net amount of inert C&D materials generated from the Project. It is estimated that that approximately
116,000 m³ of inert C&D materials (mainly soil) could be reused on-site as
backfill materials whilst approximately 4,000 m³ of surplus inert C&D
materials would be delivered to public fill reception facility (PFRF) for
beneficial reuse in other projects. It
is proposed to deliver the materials at Tseung Kwan O Area 137 Fill Bank for beneficial reuse in other projects
via Lung Cheung Road and Kwun Tong Road or
other approved PFRF. It is estimated
that an average of about 1 truck trip per day will be required to dispose these
materials off-site.
6.4.1.5
It
is estimated that approximately 2,000 m³ of non-inert C&D materials would
be generated during construction phase.
The non-inert C&D materials would be reused and recycled as much as
possible before disposal of at landfill.
It is proposed to dispose the materials at NENT
landfill via Tate's Cairn Highway, Territories Circular Road and Po Shek Wu Road
or other approved landfills. It is
estimated that an average of about 1 truck trip per day will be required to
dispose these materials off-site. DSD
shall enquire with the EPD on the availability of landfill and acceptability of
the waste.
6.4.1.6
The
waste collection frequency and transportation routes would be reviewed and subject
to the actual operation of the construction activities. Considering the minor scale of the
construction activities, no barging point or conveyor system would be
necessary.
Table
6.1 Summary of Estimated Quantities of C&D
Materials Generated during Construction Phase
|
Inert C&D Materials
(m3)
|
Non-inert C&D Materials (m3)
|
Total C&D Materials (m3)
|
|
Inert C&D Materials to be Reused
|
Inert C&D Materials to be Beneficially Reused in
Other Projects
|
|
116,000
|
4,000
|
2,000
|
122,000
|
Note:
* The non-inert
C&D materials would be reused and recycled as much as possible before
disposal of at landfill.
6.4.1.7
It
is the Contractor’s responsibility to separate the inert and non-inert C&D
materials on-site. The non-inert C&D
materials would be disposed of at strategic landfill and surplus inert C&D
materials will be transported to PFRF by trucks. A Construction and Demolition Material
Management Plan (C&DMMP) would be prepared in accordance with Section 4.1.3
of the Project Administration Handbook for Civil Engineering Works (PAH)
and submitted to Public Fill Committee (PFC) for approval in the detail design
stage. With the implementation of
proper management for C&D materials and good site practices, no
unacceptable environmental impacts (including potential hazard, air and odour
emissions, noise and wastewater discharges) and public transport impact due to
handling and disposal of C&D materials arising from the Project would be
anticipated.
Desilted Materials from Desilting at Downstream Tidal Zone
6.4.1.8
Two
desilting works at downstream tidal zone would tentatively be undertaken at the
commencement and prior to the completion of the construction works respectively
(Appendix
2.2
refers) to remove the accumulated silting and debris at the nullah. The desilting volume of each desilting works
is estimated to be 1,000 m3, i.e. a total of 2,000 m3. The desilted materials will be contained in
watertight container on-site and be transported off-site by trucks for disposal
of at NENT landfill. With the
implementation of proper management for desilted materials and good site practices,
no unacceptable environmental impacts (including potential hazard, air and
odour emissions, noise and wastewater discharges) and public transport impact
due to handling and disposal of the desilted materials arising from the Project
would be anticipated.
Chemical Waste
6.4.1.9
Materials
classified as chemical waste shall require special handling and storage
arrangements by the Contractor. All
chemical waste shall be collected by a licensed collector and be disposed at a
licensed chemical waste treatment and disposal facility such as Chemical Waste
Treatment Centre (CWTC) at Tsing Yi.
Unused chemical or those with remaining functional capacity would be
reused and recycled on site or by licensed companies whenever possible. Mitigation and control requirements for
chemical wastes are detailed in Section 6.5.1.10. Provided that the handling, storage and
disposal of chemical wastes are to be in accordance with these requirements,
adverse environmental impacts (including potential hazard, air and odour
emissions, noise and wastewater discharges) or public transport impact would
not be expected.
6.4.1.10 The
maintenance and servicing of construction plants and vehicles would generate a
negligibly small amount of chemical wastes, for instance, oil / grease,
cleaning fluids, solvents, lubrication oil and fuel, used oil filter and scrap
batteries. It is
difficult to quantify the amount of chemical waste that would arise from the
construction activities as it would be highly dependent
on the contractor’s on-site maintenance activities and the quantity of plant
and equipment utilised. It is
anticipated that the quantity of chemical waste would be small and in the order of a few cubic meters per month. The amount of chemical waste to be generated
would be quantified in the WMP to be prepared by the Contractors. Since
the construction activities would be carried out in the vicinity to the
drainage system, chemical wastes arising during the construction phase may pose
environmental, health and safety hazards if not stored and disposed of in an
appropriate manner as stipulated in the Waste
Disposal (Chemical Waste) (General) Regulations (Cap. 354C).
General Refuse
6.4.1.11
General
refuse comprises general site wastes, such as packaging and container waste
from materials and equipment used on the site, and refuse generated by
workforce. It is estimated that around
30 workers would be working on site per day during construction phase. Based on a generation rate of 0.65 kg per
worker per day, the daily arising of general refuse during the construction
period would be about 19.5 kg. Although the quantity of general refuse is
expected to be small, improper collection and removal of general refuse would
give rise to hygiene problems and adverse environmental impacts to local
residents, e.g. odour impacts, and contamination of the nearby drainage channel
if being blown around by wind, flushed or leached into the waterbodies.
6.4.1.12
The
general refuse will be collected on-site on a daily basis, separately from
C&D materials by an appropriate waste collector to be employed by the
Contractor. Prior to disposal off-site,
such refuse will be temporarily put in suitably covered storage areas / bins
where they will have to be regularly cleaned and maintained to avoid attracting
vermin and pests. With proper on-site
handling and storage as well as regular disposal of the waste, no unacceptable
environmental impact (including potential hazard, air and odour emissions,
noise and wastewater discharges) or public transport impact would be
anticipated. Recommendations of
mitigation measures for managing general refuse are presented in Section 6.5.1.11.
6.4.2.1
During the operational phase of the
Project, similar to the existing practices, regular maintenance works for the drainage and sewerage systems along TWN, including desilting along the nullah and minor maintenance to the DWFI system, would be carried
out by the DSD to remove excessive silts, debris and any obstructions to
safeguard the hydraulic capacity of the nullah. The maintenance
practices and frequency would be similar to the existing maintenance works undertaken by the DSD. Maintenance desilting of the nullah would tentatively be carried out
on an annual basis during dry season (November to March) when the water flow is
low, except during
emergency situations where the accumulated silt would adversely affect the
hydraulic capacity of the nullah or where flooding risk is imminent, or when complaints on environmental nuisance
associated with the accumulated silt are received. Minor maintenance
to DWFI system would only be undertaken on an as-needed basis and frequent
maintenance (i.e. monthly) would not be required. Small amount of silt, debris and
screenings, which would be similar in nature to general refuse, would be
generated from the operation and routine maintenance works of the DWFI system
and nullah. Such waste will be removed
by hand-held / light machinery and disposed of at landfill after the clearance
works. Similar to
the existing maintenance practices at TWN, regular maintenance desilting along the nullah would
be undertaken during operational phase and approximately 100m3 of
desilted materials, which are similar to general refuse, are anticipate to be
generated from each routine desilting maintenance works with reference to the
existing practice. Very small amount of
chemical waste, in the order of less than a cubic meter each time, would be
generated during maintenance works and would be properly stored, labelled and
removed by licensed waste collectors. No
unacceptable environmental impact (including potential hazard, air and odour emissions, noise and wastewater discharges) and
public transport impact would thus be anticipated.
6.4.2.2
General refuse would also be generated from the
visitors to the revamped public open space (e.g. viewing
decks, walkways, pavilions etc.) along TWN and riparian amenity areas near Pok Ngar Villa. Under the revitalisation design, there would
be an addition of around 420 visitors per day on weekdays and 1,845 visitors per
day on weekends/holidays, mainly at the riparian amenity areas. Based on the additional number of visitors
and the 0.60 kg per capita generation rate of commercial waste (waste generated
by visitor) in 2019, around 252 kg
and 1,107 kg of general refuse would be generated daily on weekdays and on
weekends/holidays respectively during operation. Provided that sufficient number of trash bins
and recycling bins (which are enclosed / covered with lid) have already been
provided and would be retained for the collection of general refuse generated
by visitors along TWN, no unacceptable environmental impact (including
potential hazard, air and odour emissions, noise,
wastewater discharges and wind-blown litters) and public transport impact would
thus be anticipated. Same as the
existing practice, the general refuse would
be removed by reputable waste collector on a daily basis.
Waste Management Hierarchy
6.5.1.1
The
waste management hierarchy has been applied in the assessment and development
of mitigation measures for waste which aims at evaluating the desirability of
waste management methods and includes the followings in descending preference:
l Avoidance
and reduction of waste generation;
l Reuse
of materials as far as practicable;
l Recovery
and recycling of residual materials where possible; and
l Treatment
and disposal according to
relevant laws, guidelines and good practices.
6.5.1.2
Good
site practices and waste reduction measures to achieve avoidance and minimisation
of waste generation in the hierarchy are recommended as follow.
Good Site Practices
6.5.1.3
Adverse
impacts would not arise in the construction site, provided that good site
practices are strictly followed. Recommendations
for good site practices during the construction phase include:
l Nomination of approved personnel,
such as a site manager, to be responsible for implementation of good site
practices, arrangements for waste collection and effective disposal to an
appropriate facility;
l Training of site personnel in site
cleanliness, concepts of waste reduction, reuse and recycling, proper waste
management and chemical waste handling procedures;
l Provision of sufficient waste
reception / disposal points, and regular collection of waste;
l Adoption of appropriate measures to minimise windblown litter and dust during transportation of waste by either covering
trucks or by transporting wastes in enclosed containers;
l Provision of regular cleaning and
maintenance programme for drainage
systems, sumps and oil interceptors;
l Adoption of a recording system for
the amount of wastes generated, recycled and
disposed (including the disposal sites); and
l Preparation of WMP, as a part of the
EMP in accordance with ETWB TC(W) No. 19/2005 "Environmental Management on
Construction Sites" for submission to the Architect/Engineer for
approval.
Waste Reduction
Measures
6.5.1.4
Good management and control of
construction site activities / processes can minimise the generation 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 are discussed as follow:
l Segregate and store different types
of construction related waste in different containers, skips or stockpiles to
enhance reuse or recycling of materials and their proper disposal;
l Provide separate labelled bins to
segregate recyclable waste such as aluminium cans from other general refuse generated by the work force, and to
encourage collection by individual collectors;
l Recycle any unused chemicals or
those with remaining functional capacity;
l Maximise the use of reusable steel formwork to reduce the amount of C&D
materials;
l Adopt proper storage and site
practices to minimise the potential
for damage to, or contamination of construction materials;
l Plan the delivery and stock of
construction materials carefully to minimise the amount of waste generated; and
l Minimise over ordering and wastage through careful planning during purchasing of
construction materials.
6.5.1.5
In
addition to the above good site practices and waste reduction measures,
specific mitigation measures are recommended below for the identified waste
arising to minimise environmental impacts during the handling, transportation
and disposal of these waste.
Reducing and Reuse of C&D Materials
6.5.1.6
Careful
design, planning together with good site management can reduce over-ordering
and generation of C&D materials such as concrete, mortar and cement
grouts. Formwork should be designed to
minimise the use of standard wooden panels, so that high reuse levels can be
achieved. Alternatives such as steel formwork
or plastic facing should be considered to increase the potential for
reuse.
6.5.1.7
To
minimise off-site disposal of inert C&D materials, the excavated inert
materials with suitable characteristics / size should be reused on-site as fill
material as far as practicable. The
surplus inert C&D materials would be transported and delivered to public
filing area for beneficial reuse as fill material by other projects. Prior to disposal of non-inert C&D
materials, wood, steel and other metals should also be separated for reuse and
/ or recycle where practicable so as to minimise the quantity of waste to be
disposed of at landfill.
Storage of C&D Materials
6.5.1.8
Suitable
areas should be designated within the works site boundaries for temporary
stockpiling of C&D materials. The temporary storage of C&D materials
on-site should be limited to no more than 1,000m3. Within stockpile areas, the following
measures should be taken to control potential environmental impacts or
nuisance:
l cover
material during heavy rainfall;
l locate
stockpiles to minimise potential visual impacts; and
l minimise
land intake of stockpile areas as far as possible.
Delivering of C&D Materials
6.5.1.9
In
order to monitor the delivering of C&D materials at the designated public
fill reception facility and landfill and to control fly-tipping, a trip-ticket
system should be included. One may make
reference to DEVB TC(W) No.06/2010
for details. A recording system for the
amount of waste generated, recycled and disposed, including the disposal sites,
should also be set up. Warning signs
should be put up to remind the designated disposal sites. CCTV should also be installed at the
vehicular entrance and exit of the site as additional measures to prevent
fly-tipping. When delivering inert
C&D materials at a public fill reception facility for beneficial reuse, the
material shall only consist of soil, rock, concrete, brick, cement plaster /
mortar, inert building debris, aggregates and asphalt, and be free from marine
mud, household refuse, plastic, metals, industrial and chemical waste, animal
and vegetable matter, and other material considered to be unsuitable by the
Filling Supervisor.
Chemical Waste
6.5.1.10
If
chemical waste is produced
at the construction site, the Contractor would be required to register with the
EPD as a Chemical Waste Producer and must follow the guidelines stated in the Code of Practice on the Packaging, Labelling
and Storage of Chemical Wastes. Good
quality containers compatible with the chemical wastes should be used, and
incompatible chemicals should be stored separately. Appropriate labels should be securely
attached on each chemical waste container indicating the corresponding chemical
characteristics of the chemical waste, such as explosives, flammable, oxidising,
irritant, toxic, harmful, corrosive, etc.
The Contractor shall use a licensed collector to transport and dispose
of the chemical wastes at a licensed chemical waste treatment and disposal
facility such as CWTC at Tsing Yi in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.
General Refuse
6.5.1.11 General refuse should be stored in enclosed bins or
compaction units separate from C&D materials and chemical wastes. A reputable waste collector should be
employed by the Contractor to remove general from the site, separately from
C&D materials and chemical wastes, on a daily basis to minimise odour, pest
and litter impacts. The collected general refuse will be disposed
of at designated landfill. Clearly
labelled recycling bins should be provided on site in order to encourage
segregation and recycling of aluminium and plastic wastes, and wastepaper in
order to reduce general refuse production.
The contractor should carry out an education programme for workers in
avoiding, reducing, reusing and recycling of materials generation. Posters and leaflets advising on the use of
the bins should also be provided onsite as reminders. The recyclable waste materials should then be
collected by reliable waste recycling agents on a regular basis.
Desilted Materials
6.5.1.12 The desilted materials should be contained in watertight container
on-site and be transported off-site by trucks for disposal of at strategic
landfill. In order to minimise the
potential odour emissions during excavation and transportation of the desilted
materials, the excavated silts shall be wetted during excavation / material
handling and shall be properly covered when placed on trucks. Loading of the materials to the truck shall
be controlled to avoid splashing and overflowing of the slurry to the surrounding
water.
6.5.1.13 Requirements of the Air Pollution Control (Construction Dust)
Regulation and Water Pollution Control Ordinance (WPCO), where relevant, shall
be adhered to during excavation, transportation and disposal of the desilted
materials.
6.5.2.1
The maintenance
practices would be similar to the existing maintenance works undertaken by the
DSD. The
silt materials, debris and screenings from the DWFI system and nullah during
routine maintenance, as well as from maintenance desilting would be stored in
enclosed bins or compaction units and transported to the designated landfill
for disposal as soon as possible following good waste management practices for
handling of desilted materials generated during construction phase as detailed
in Sections 6.5.1.12
– 6.5.1.13.
6.5.2.2
Mitigation
measure as mentioned in Section 6.5.1.10
would be followed during operational phase.
All chemical waste generated from the maintenance works should be
properly stored, labelled and removed by licensed waste collectors in
accordance with Waste Disposal (Chemical Waste) (General) Regulation.
6.5.2.3
Sufficient number
of trash bins and recycling bins have already been provided and would be retained
for the collection of general refuse generated by visitors along TWN. Same as the existing practice, the general
refuse would be removed by reputable waste collector on a daily basis.
6.5.2.4
A summary of the various types of
waste to be generated during construction and operational phases of the
Project, together with the recommended handling methods and disposal routes are
presented in Table 6.2.
Table
6.2 Summary of Waste
Handling Methods, Transportation Routes and Disposal Outlets
|
Waste Type and Estimated Quantity to be Generated
|
Handling Methods
|
Transportation Routes
& Disposal Outlets
|
|
Construction Phase
|
|
Inert C&D materials
·
120,000 m3
|
Ÿ
Segregation from
non-inert C&D materials
Ÿ
Reuse on-site as far as
practicable
|
Ÿ
Tseung Kwan O Area 137
Fill Bank for beneficial reuse in other projects via Lung Cheung Road and
Kwun Tong Road
|
|
Non-inert C&D
materials
·
2,000 m3
|
Ÿ
Segregation from inert
C&D materials
Ÿ
Reusable materials should
be separated and recycled as far as practicable
|
Ÿ
NENT landfill via Tate's Cairn Highway, Territories
Circular Road and Po Shek Wu Road
|
|
Chemical wastes from maintenance and servicing of construction plants
·
A few cubic meters per
month
|
Ÿ
Unused chemical would be
recycled on-site or off-site disposal by licensed collectors.
Ÿ
Store on-site within
suitably designed containers
|
Ÿ
CWTC via Tsing Sha
Highway
|
|
General refuse
·
19.5 kg/day
|
Ÿ
Provide on-site refuse collection
facilities
Ÿ
Provide on-site clearly
labelled recycling bins for segregation of aluminium and plastic wastes, and
wastepaper
|
Ÿ
Employ a reputable waste
collector for collection and final disposal of general refuse to NENT
landfill to via Tate's Cairn Highway,
Territories Circular Road and Po Shek Wu Road
Ÿ
Employ reliable waste
recycling agents to collect the segregated recyclable wastes
|
|
Desilted materials from desilting works at downstream tidal zone
·
2,000 m3
|
Ÿ
Contained in watertight container
on-site
|
Ÿ
Employ a reputable waste
collector for collection and final disposal of general refuse to NENT
landfill to via Tate's Cairn Highway, Territories Circular Road and Po Shek Wu Road
|
|
Operational Phase
|
|
Silts, debris and screenings from maintenance of DWFI system and
nullah
·
Small amount
|
Ÿ
Store in enclosed bins or
compaction units for off-site disposal by reputable waste collector
|
Ÿ
NENT landfill via Tate's Cairn
Highway, Territories Circular Road and Po Shek Wu
Road
|
|
Desilted materials from maintenance desilting works
·
Up to 100 m3 each
time
|
Ÿ
contained in watertight
container on-site
|
Ÿ
Employ a reputable waste
collector for collection and final disposal of general refuse to NENT
landfill to via Tate's Cairn Highway, Territories Circular Road and Po Shek Wu Road
|
|
Chemical wastes
·
Very small amount of less
than a cubic meter each time
|
Ÿ
Store in compatible
containers in designated area on site for off-site disposal by licensed
collectors
|
Ÿ
CWTC via Tsing Sha
Highway
|
|
General refuse from visitors along TWN
·
252 kg/day on weekdays
·
1,107 kg/day on
weekends/holidays
|
Ÿ
Retain existing trash
bins and recycling bins along TWN for collection of general refuse
|
Ÿ
Follow existing practice
to be collected and removed by reputable waste collector for final disposal
of to NENT landfill via Tate's Cairn Highway, Territories Circular Road and
Po Shek Wu Road
|
6.6.1.1
With
the implementation of the recommended mitigation measures for the handling,
transportation and disposal of the identified waste arising, residual impacts
would not be expected during the construction and operation of the proposed
Project.
6.7.1
Construction Phase
6.7.1.2
Monthly
site audit should be conducted by the Environmental Team (ET) during
construction phase to check if wastes are being managed in accordance with
approved procedures. The audits should
cover site inspection on all aspects of on-site waste management practices
including waste generation, storage, recycling, transport and disposal. Apart from site inspections, waste management
related documents including licenses, permits, disposal and recycling records
should be reviewed and audited for compliance with the legislation of the
recommended good site practice and other waste management mitigation measures
under the site audit.
6.7.2
Operational Phase
6.7.2.1
It
is expected that there would be limited quantities of waste to be generated
from the operation of the Project and adverse environmental impacts would not
be anticipated with the implementation of good waste management practices following the existing practices of regular maintenance works.
Environmental audit programme on waste management for the operation
phase of the Project would not be required.
6.8
Conclusion
6.8.1.1
During
construction phase, waste types generated from the Project are likely to
include C&D materials from construction activities, chemical wastes from maintenance and
servicing of construction plants and vehicles, desilted materials from desilting
works at downstream tidal zone, and general refuse from workforce. In view of the nature and limited scale of
the Project, the quantity of waste arisings would not be substantial. However, improper handling, collection,
transportation and re-use / disposal of the wastes would likely give rise to
hygiene problems and adverse environmental impacts, e.g. odour nuisance to
local residents, and contamination of the nearby watercourses. Provided that these wastes are handled,
transported and disposed of according to the recommended good site practices
and measures, no adverse environmental impacts (including potential hazard, air
and odour emissions, noise and wastewater discharges) would be anticipated
during the construction phase.
6.8.1.2
The
main waste types generated from the operation of the Project would be silt,
debris, screening and limited amount of chemical waste from the routine
maintenance of the DWFI system and nullah as well as desilted materials from maintenance desilting works.
The
maintenance practices would be similar to the existing maintenance works
undertaken by the DSD. With implementation of the good waste
management practices, adverse environmental impacts (including potential
hazard, air and odour emissions, noise and wastewater discharges) and public
transport impact would not be anticipated during operational phase.
General
refuse would also be generated from the visitors of the revamped public open
space along TWN. Provided that sufficient number of trash bins
and recycling bins have already been provided and would be retained for the
collection of general refuse generated by visitors along TWN, no
unacceptable environmental impact would be anticipated.