1.
2.
3.
4.
5.
6.1.1
This Section provides an evaluation of the
potential waste management implications associated with the construction and
operation of the Project. Mitigation measures have been proposed if considered
necessary.
6.2.1
The following discussion on legislative
requirements and evaluation criteria applies to both the construction and
operation phases of the Project. The
criteria and guidelines for evaluating potential waste management implications
are laid out in Annexes 7 and 15 of the EIAO-TM under the EIAO (Cap 499). The following legislation covers, or has some
bearing uposn the handling, treatment and disposal of the wastes generated from
the construction and operation of the Project.
·
Waste Disposal Ordinance (Cap.354);
·
Waste Disposal (Chemical Waste) (General)
Regulation (Cap 354C)
·
Waste Disposal (Charges for Disposal of
Construction Waste) Regulation (Cap. 354N);
·
Land (Miscellaneous Provisions) Ordinance (Cap.28);
and
·
Public Health and Municipal Services Ordinance
(Cap.132) – Public Cleansing and Prevention of Nuisances Regulation.
Waste Disposal Ordinance
(Cap 354)
6.2.2
The Waste Disposal Ordinance (WDO) prohibits the
unauthorised disposal of wastes. Construction waste is defined under Cap. 354N
of the WDO as any substance, matter or thing that is generated and abandoned
from construction works regardless if it has been processed or stockpiled
before being abandoned, excluding sludge, screenings or any matter removed or
generated from desludging, desilting or dredging works. Under WDO, waste can be
disposed of only at designated waste disposal facilities licensed by the
Environmental Protection Department (EPD).
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354C)
6.2.3
Issued under the WDO, the Waste Disposal (Chemical
Waste) (General) Regulation administers the possession, storage, collection,
transport and disposal of chemical wastes. EPD has also issued three guidelines
detailing how the Contractor should comply with the regulations on chemical
wastes, namely A Guide to the Chemical Waste Control Scheme (2016), A Guide to
the Registration of Chemical Waste Producers (2016) and Code of Practice on the
Packaging, Labelling and Storage of Chemical Wastes (1992).
Waste Disposal (Charges
for Disposal of Construction Waste) Regulation (Cap. 354N)
6.2.4
Under the Waste Disposal (Charges for Disposal
of Construction Waste) Regulation enacted in January 2006, 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 Facility (PFRF) for
disposal must consist entirely of inert material.
Land (Miscellaneous Provisions) Ordinance (Cap 28)
6.2.5
The inert C&D materials (also called public
fill) may be taken to public fill reception facilities. Public fill reception facilities usually form
part of land reclamation schemes and are operated by the Civil Engineering and
Development Department (CEDD) and others.
The Land (Miscellaneous Provisions) Ordinance requires that individuals
or companies who deliver inert C&D materials to the public fill reception
facilities to obtain Dumping Licences.
The licences are issued by CEDD under delegated authority from the
Director of Lands.
6.2.6
Individual licences and windscreen stickers are
issued for each vehicle involved. Under
the licence conditions, public fill reception facilities will only accept
earth, soil, sand, rubble, brick, tile, rock, boulder, concrete, asphalt,
masonry or used bentonite. In addition,
in accordance with paragraph 11 of DEVB TC(W) No. 6/2010 “Trip Ticket System for Disposal of Construction and Demolition
Materials”, the Public Fill Committee will advise on the acceptance
criteria (e.g. no mixing of construction waste, nominal size of the materials
less than 250mm, etc). The material
will, however, be free from marine mud, household refuse, plastic, metal,
industrial and chemical wastes, animal and vegetable matter and any other
materials considered unsuitable by the public fill reception facility
supervisor.
Public Health and
Municipal Services Ordinance (Cap 132) – Public Cleansing and Prevention of
Nuisances Regulation
6.2.7
This Regulation provides a further control on
the illegal dumping of wastes on unauthorised (unlicensed) sites.
Other Relevant Guidance
6.2.8
Other guideline documents which detail how the Contractor
will comply with the WDO and its associated regulations include:
·
Waste Disposal Plan for Hong Kong (December
1989), Planning, Environment and Lands Branch Government Secretariat, Hong Kong
Government;
·
Chapter 9 - Environment (2014), Hong Kong Planning
Standards and Guidelines, Hong Kong Government;
·
New Disposal Arrangements for Construction Waste
(1992), EPD & CED, Hong Kong Government;
·
Code of Practice on the Packaging, Labelling and
Storage of Chemical Wastes (1992), EPD, Hong Kong Government;
·
Works Branch Technical Circular (WBTC) No.
32/92, The Use of Tropical Hard Wood on Construction Site, Works Branch, Hong
Kong Government;
·
WBTC No. 2/93, Public Dumps, Works Branch, Hong
Kong Government;
·
WBTC No. 2/93B, Public Filling Facilities, Works
Branch, Hong Kong Government;
·
WBTC No. 16/96, Wet Soil in Public Dumps, Works
Branch, Hong Kong Government;
·
WBTC Nos. 4/98 and 4/98A, Use of Public Fill in
Reclamation and Earth Filling Projects, Works Bureau, Hong Kong Government;
·
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, Hong Kong Government;
·
WBTC No. 12/2000, Fill Management; Works Bureau,
Hong Kong Government;
·
WBTC No. 19/2001, Metallic Site Hoardings and
Signboards, Works Bureau, Hong Kong Government;
·
WBTC No. 11/2002, Control of Site Crusher, Works
Bureau, Hong Kong Government;
·
WBTC No. 12/2002, Specification Facilitating the
Use of Recycled Aggregates. Works Bureau, Hong Kong Government;
·
ETWB TC(W) No. 19/2005 Environmental Management
on Construction Site; Environment, Transport and Works Bureau, Hong Kong
Government.
·
DEVB TC(W) No. 6/2010, Trip Ticket for Disposal
of Construction and Demolition Materials;
·
DEVB TC(W) No. 8/2010, Enhanced Specification
for Site Cleanliness and Tidiness;
·
DEVB TC(W) No.2/2011, Encouraging the Use of
Recycled and Other Green Materials in Public Works Projects;
·
DEVB TC(W) No. 9/2011, Enhanced Control Measures
for Management of Public Fill; and
·
Hong Kong Blueprint for Sustainable Use of
Resources 2013-2022, Environment Bureau, May 2013;
·
Project Administration Handbook for Civil
Engineering Works (2020 Edition) – Section 4.1.3
relating to construction and demolition materials.
6.3.1
The potential environmental impacts associated
with the handling and disposal of waste arising from the construction and
operation of the Project were assessed in accordance with the criteria
presented in Annexes 7 and 15 of EIAO-TM and summarised as follows.
·
Estimation of the types and quantities of the
wastes to be generated based on information provided by the Engineering Design
Team and the relevant research and studies on waste arisings;
·
Identification of disposal options for each type
of waste;
·
Assessment of the secondary environmental
impacts due to the management of waste with respect to potential hazards, air
and odour emissions, noise, wastewater discharges and public transport; and
·
Assessment of the potential impacts by handling,
collection, transportation and re-use / disposal of wastes.
Construction Phase
6.4.1
The main construction works of the Project would
include:
·
Site Formation;
·
Construction of tunnel portal and access tunnel;
·
Construction of service reservoirs and pumping stations
in caverns;
·
Construction of ancillary buildings at tunnel portal;
·
Fresh water / salt water mainlaying; and
·
E&M Installation
6.4.2
These construction works will generate a variety
of C&D materials. Chemical waste and general refuse may also arise as a
result of construction activities.
Operation Phase
6.4.3
Wastes arising from the operation of the Project
would include:
·
Chemical waste; and
·
General refuse
6.4.4
As the relocated DHSRs are mainly for the
storage and pumping of fresh water and flushing water, waste generation is not
envisaged during the operation of the relocated DHSRs. The relocated DHSRs and the
proposed ancillary facilities will be unmanned. Small amount of general refuse and
chemical waste would be generated during regular checking and maintenance in
operation phase.
Construction Phase
·
C&D materials;
·
Chemical waste; and
·
General refuse.
6.5.2
The estimation of volumes of different types of
waste generated during construction phase is summarised in Table 6.1.
Table 6.1 Summary of Different Types of Waste
Volumes Generated during Construction Phase
|
Proposed Works (Tentative Programme)
|
Inert C&D Materials
|
Non-inert C&D
Materials
|
Chemical Waste
|
General Refuse
|
|
Generated, m3
|
Re-used On-site, m3
|
Disposal, m3
|
Generated, m3
|
Recycled Off-site, m3
|
Disposal, m3
|
|
Site Formation
(2022-2023)
|
7,945
|
0
|
7,945
|
159
|
112
|
47
|
50 litres / month
|
65 kg/day
|
|
Construction of Tunnel Portal (2022-2023)
|
1,589
|
0
|
1,589
|
32
|
23
|
9
|
|
Construction of Access Tunnel (2022-2024)
|
137,600
|
18,321
|
119,279
|
2,386
|
1,670
|
716
|
|
Construction of Service Reservoirs and Pumping Stations in Caverns
(2024-2025)
|
109,640
|
13,608
|
96,032
|
1,922
|
1,345
|
577
|
|
Construction of Ancillary Building at Tunnel
Portal (2025-2026)
|
9,604
|
0
|
9,604
|
193
|
135
|
58
|
|
Fresh Water / Salt Water Mainlaying
(2022-2026)
|
19,955
|
12,118
|
7,837
|
157
|
110
|
47
|
|
E&M Installation
(2025-2026)
|
0
|
0
|
0
|
30
|
21
|
9
|
|
Total
|
286,333
|
44,047
|
242,286
|
4,879
|
3,416
|
1,463
|
|
|
|
Note:
* The
estimated quantities of C&D materials are based on the latest design of
the Project and the available ground investigation data. The waste arising
will largely depend on the contractor works programme and activities.
|
C&D Materials
6.5.3
C&D materials will be generated from the site
formation, construction of cavern & tunnel, construction of service
reservoirs and pumping stations in cavern, construction of ancillary building,
water mainlaying and E&M installation. The C&D materials may consist of
inert materials such as soil, rock, concrete, brick and asphalt and non-inert materials
comprising metal, timber, paper and plastic. The excavation volume of C&D
materials has been minimised during consideration of design options. Please
refer to Section 2.10 for the
details. Based on the latest design, the estimated volume of C&D materials
generated from the Project is about 291,212 m3. No imported fill is
required for the Project. All C&D
materials generated shall be sorted on site into inert C&D materials and
the non-inert C&D materials two separate portions. The C&D materials,
the reusable and/or recyclable materials shall be recovered before disposal of
the waste portion off site as a last resort.
6.5.4
Different kinds of wooden materials are essential to the
construction project. All wooden materials used on site should be kept
separated from other wastes. Wooden boards will be reused on site several times
until the quality of the boards is no longer suitable for re-use. On completion
of construction project, remaining reusable wooden material will be sorted and
used at other construction sites by the contractor.
6.5.5
Reusable steel and concrete panels shall be used as a
preferred alternative to wooden formwork, falsework, and site fencing.
6.5.6
The majority of C&D materials generated from the
Project will be inert C&D materials from excavation works of the proposed
cavern/tunnel. Approximately 286,333 m3 of
inert C&D materials will be generated of which 210,440 m3 is
rock (Grade III or above) and 75,893 m3 is inert soft materials.
Approximate 15% (about 44,047 m3) inert C&D materials could be
reused on-site as filled material, resulting in disposal of about 242,286 m3.
The surplus inert C&D materials would be disposed of at Tseung Kwan O
(TKO) Area 137 Fill Bank via Lung Cheung Road for off-site beneficial reuse.
Assuming a capacity of 7 m3 per truck, bulk factor of 1.7 and 25
working days a month, it is estimated that approximate 94 peak truck trips per
day would be required for the disposal of estimated 116,496 m3
of inert C&D materials during Year 2024. The designated disposal site of inert C&D
materials shall be confirmed with the Public Fill Committee of CEDD. A
C&DMMP will be prepared and submitted to Public Fill Committee for approval
in accordance with Project Administration Handbook for Civil Engineering
Works. Conveyor system would be adopted within Project Area (inside
cavern / tunnel). This is a land-based Project, no barging point will be required
for transportation of excavated material. The control measures proposed in Section 6.6 shall be followed for the
management of inert C&D materials.
6.5.7
Non-inert C&D materials (e.g. metal, timber, paper and plastic) will be generated from site
clearance and general construction activities. Such materials will be sorted
for reuse and recycling as far as possible before disposal to landfill. Approximately 4,879 m3 of
non-inert C&D materials will be generated. The non-inert C&D materials
would be disposed of at South East New Territories (SENT) Landfill. The designated disposal site of
non-inert C&D materials shall be confirmed with the EPD. The separated
recyclable non-inert C&D materials shall be collected by recycling
companies for off-site reuse or recycling, the estimated non-inert C&D
materials recycling rate would be up to 70%. The control measures proposed in Section 6.6 shall be followed for the
management of non-inert C&D materials.
6.5.8
Based on the latest design, the programme of disposal of C&D materials
for the Project is presented in Table
6.2.
Table 6.2 Programme of Disposal of
C&D Materials
|
C&D Materials
|
Estimated Quantity (m3)
|
|
Year 2022
|
|
Inert C&D materials
|
7,586
|
|
Non-inert C&D materials
|
46
|
|
Year 2023
|
|
Inert C&D materials
|
83,683
|
|
Non-inert C&D
materials
|
502
|
|
Year 2024
|
|
Inert C&D materials
|
116,496
|
|
Non-inert C&D
materials
|
699
|
|
Year 2025
|
|
Inert C&D materials
|
31,068
|
|
Non-inert C&D
materials
|
187
|
|
Year 2026
|
|
Inert C&D materials
|
3,454
|
|
Non-inert C&D
materials
|
29
|
|
Year 2027
|
|
Inert C&D materials
|
0
|
|
Non-inert C&D
materials
|
0
|
Chemical Waste
6.5.9
Wastes classified as chemical waste are listed in
the Waste Disposal (Chemical Waste) (General) Regulation. Where the construction
processes produce chemical waste, the contractor must register with EPD as a
chemical waste producer. In general, chemical waste would mainly arise from
maintenance of construction equipment. These may include the following items:
·
scarp batteries or spent acid/alkali from their
maintenance;
·
used engine oils, hydraulic fluids and waste
fuel;
·
spent mineral oils/cleaning fluids from
mechanical machinery; and
·
spent solvents/solutions from equipment cleaning
activities.
6.5.10
Accidental spillages of chemicals in the works area
may contaminate the top soils on exposed ground/earth. The contaminated soil particles may be washed
away by construction site runoff causes water pollution.
6.5.11
Chemical wastes pose environmental and health and
safety hazards if not stored and disposed of in an appropriate manner as
outlined in the Waste Disposal (Chemical Waste) (General) Regulation. These hazards include:
·
Toxic effects to workers;
·
Adverse effects on water quality from spills;
and
·
Fire hazards.
6.5.12
The amount of chemical waste cannot be accurately
predicted at this stage since it largely depends on the contractor’s
housekeeping measure. The amount is
anticipated to be small (about 50 litres per month) and it is recommended that
good housekeeping measures should be implemented to reduce the amount of
chemical waste generated. The chemical wastes will be collected by licensed
collector for the disposal of at licensed treatment facilities (e.g. Chemical
Waste Treatment Centre (CWTC) at Tsing Yi) in accordance with relevant
regulation and guideline.
6.5.13
With the incorporation of suitable arrangements for
the storage, handling, transportation and disposal of chemical wastes under the
requirements stated in the Code of Practice on the Packaging, Labelling and
Storage of Chemical Waste, no unacceptable environmental impacts and hazards
will result from the handling, transportation and disposal of chemical waste
arising from the Project. The control measures proposed in Section 6.6 shall be followed for the management of chemical waste.
General Refuse
6.5.14
General refuse will be generated by the site staff
and construction workers during the construction period. This includes food
scraps, aluminum cans, waste papers, plastic containers, food packaging, etc.
The amount of general refuse that may be produced is dependent on size of
workforce at site.
6.5.15
It is expected not more than 100 site staff and
construction workers will be working on site. Assuming a general refuse generation
rate of 0.65 kg per worker per day, the amount of general refuse to be
generated on site will be about 65 kg per day. The general refuse generated
will be collected by a waste collector and disposed of at waste
transfer/disposal facilities and then to landfill.
6.5.16
The storage of general refuse has the potential to
give rise to a variety of adverse environmental impacts. These include odour if
waste is not collected frequently, water quality impacts if waste enters water
bodies and visual impact from windblown litters. The refuse may attract pests
and vermin if the storage areas are not well maintained and cleaned regularly.
In addition, disposal of waste at sites other than approved waste transfer or
disposal facilities can also lead to environmental impacts.
6.5.17
Handling and disposal of general refuse should cope
with the presence of peak workforce during the construction period. With
respect to the small quantity of general refuse to be generated, provided that
the refuse is stored and transported in accordance with proper practices and
disposed at approved disposal facilities, potential environmental impact is not
expected. The control measures proposed in Section
6.6 shall be followed for the management of general refuse.
6.5.18
The tentative transportation routings for the
disposal of various types of waste are shown in Table 6.3.
Table 6.3 Tentative Transportation Routings for Waste Disposal
|
Types of Waste
|
Handling
|
Proposed Disposal Outlet
|
Estimated Frequency of Truck
|
Tentative Transportation Routing
|
|
Inert
C&D Materials
|
Sort on-site into inert C&D material (public fill) and
non-inert C&D materials;
44,047 m3 of inert C&D
material to be reused on-site.
|
242,286
m3 of inert C&D material to be disposed at public fill
reception facility[1] at TKO Area 137 Fill Bank for other beneficial uses
|
94 peak
truck trips per day
|
via
Lung Cheung Road, Kwun Tong Road, Tseung Kwan O Road, Wan Po Road
|
|
Non-inert
C&D Materials
|
Wooden
Material (reusable as lower grade shuttering or fencing on-site or other
sites);
Scrap metals (Reusable steel panels shall be used as site
fencing)
3,416 m3 of inert C&D
material to be recycled off-site.
|
1,463 m3
of non-inert C&D material or if rejected by recycling companies as the
last resort to SENT Landfill
|
Not
more than 1 truck trip per day
|
via
Lung Cheung Road, Kwun Tong Road, Tseung Kwan O Road, Wan Po Road
|
|
Chemical
Waste
|
Provide on-site refuse collection points for collection by
licensed collector
|
To CWTC or other licensed facility
|
N/A
|
via
Lung Cheung Road, Ching Cheung Road, Tsing Kwai Highway, Kwai Tsing Road,
Tsing Yi Road
|
|
General
Refuse
|
Provide on-site refuse collection points
|
To
waste transfer/ disposal facilities and then to landfill
|
Not
more than 1 truck trip per day
|
To be
determined
|
|
Remarks:
[1] The disposal site of inert C&D materials is subject to the
designation by the Public Fill Committee (PFC) according to DEVB TC(W) No.
6/2010.
|
Operation Phase
6.5.19
As the relocated DHSRs are mainly for the storage
and pumping of fresh water and flushing water and the relocated DHSRs and the
other ancillary facilities will be unmanned, only small amount (in the order of
a few kg per month) of general waste (such as paper, plastic, etc.) would be
generated during regular checking and maintenance in operation phase. The
general refuse generated will be collected by a waste collector and disposed of
at waste transfer/disposal facilities and then to landfill.
6.5.20
A small amount of lubricant and cleaning solvent
will be kept in paved storeroom at the pumping stations/ancillary building.
Small amount (in the order of a few litres per month) of chemical waste will be
generated during operation phase will be collected by licensed collector for
the disposal of at licensed treatment facilities (e.g. CWTC at Tsing Yi).
Construction Phase
General
6.6.1
The construction and demolition waste management
policy follows the same hierarchy as for other wastes i.e. in order of
desirability: avoidance, minimization, recycling, treatment and safe disposal
of waste.
6.6.2
Training of construction staff should be undertaken
by the contractor about the concept of site cleanliness and appropriate waste
management procedures. The contractor
should develop and provide toolbox talk for on-site sorting of C&D materials
to enhance workers’ awareness in handling, sorting, reuse and recycling of
C&D materials. Requirements for
staff training should be included in the contractor’s Environmental Management
Plan (EMP). The EMP shall be submitted to the Architect/Engineer for approval
before construction works in accordance with ETWB TC(W) No.19/2005.
6.6.3
Good planning and site management practice should
be employed to eliminate over ordering or mixing of construction materials to
reduce wastage. Proper storage and site
practices will minimise the damage or contamination of construction materials.
6.6.4
Where waste generation is unavoidable, the
potential for recycling or reuse should be rigorously explored. If waste cannot be recycled, disposal routes
described in the EMP should be followed. A recording system for the amount of wastes generated,
recycled and disposed (including the disposal sites) should be implemented. In order to monitor the disposal of C&D
material and solid wastes at public filling facilities and landfills and to
control fly-tipping, a trip-ticket system should be included. One may make reference to DEVB TC(W) No.
6/2010 for details.
6.6.5
Regular cleaning and maintenance of the waste
storage area should be provided.
Best Management Practice
6.6.6
The proposed mitigation measures are as below:
·
An on-site environmental co-ordinator should be
identified at the outset of the works. The co-ordinator shall
prepare an Environmental Management Plan (EMP) incorporating waste management
in accordance with the requirements set out in the ETWB TCW No. 19/2005,
Environmental Management on Construction Sites. The EMP shall include monthly
and yearly Waste Flow Tables (WFT) that indicate the amounts of waste
generated, recycled and disposed of (including final disposal site), and which
should be regularly updated. WFT will be provided in the WMP which will form
part of the EMP in accordance with ETWB TCW No.19/2005;
·
The reuse/recycling of all materials on site
shall be investigated prior to treatment/ disposal off- site;
·
Good site practices shall be adopted from the
commencement of works to avoid the generation of waste, reduce cross
contamination of waste and to promote waste minimisation;
·
All waste materials shall be sorted on-site into
inert and non-inert C&D materials, and where the materials can be recycled
or reused, they shall be further segregated. Inert C&D materials
will comprise stone, rock, masonry, brick, concrete and soil which is suitable
for land reclamation and site formation whilst non-inert C&D materials
include all other wastes generated from the construction process such as
plastic packaging and vegetation (from site clearance);
·
The contractor shall be responsible for
identifying what materials can be recycled/ reused, whether on-site or
off-site. In the event of the latter, the contractor shall make arrangements
for the collection of the recyclable materials. Any remaining
non-inert C&D materials shall be collected and disposed of to the landfills
whilst any inert C&D materials shall be re-used on site as far as possible.
Alternatively, if inert C&D materials cannot be reused on-site, the
materials would be delivered to public fill reception facilities for beneficial
reuse after obtaining the appropriate licence;
·
With reference to DEVB TCW No.6/2010,
Trip-ticket System for Disposal of Construction and Demolition Material, a trip
ticket system should be established at the outset of the construction to
monitor the disposal of C&D materials and solid wastes from the site to
public filling facilities and landfills;
·
Under the Waste Disposal (Chemical Waste)
(General) Regulation, the Contractor shall register as a Chemical Waste
Producer if chemical wastes such as spent lubricants and paints are generated
on site. Only licensed chemical waste collectors shall be employed to collect
any chemical waste generated at site. The handling, storage, transportation and
disposal of chemical wastes shall be conducted in accordance with the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes and A Guide
to the Chemical Waste Control Scheme both published by EPD;
·
A sufficient number of covered bins shall be
provided on site for the containment of general refuse to prevent visual
impacts and nuisance to the sensitive surroundings. These bins shall
be cleared daily and the collected waste disposed of to the refuse transfer
station. Further to the issue of DEVB TCW No. 8/2010, Enhanced Specification
for Site Cleanliness and Tidiness, the contractor is required to maintain a
clean and hygienic site throughout the Project works;
·
Tool-box talks should be provided to workers
about the concepts of site cleanliness and appropriate waste management
procedures, including waste reduction, reuse and recycling; and
·
The contractor shall comply with all relevant statutory
requirements and guidelines and their updated versions that may be issued
during the course of Project construction.
On-site Sorting, Reuse and Recycling
6.6.7
All waste materials should be segregated into
categories covering:
·
Inert C&D materials suitable for reuse
on-site;
·
Inert C&D materials suitable for public fill
reception facilities;
·
Recyclable non-inert C&D materials for
recycling;
·
Remaining non-inert C&D materials for
landfill;
·
Chemical waste; and
·
General refuse for landfill.
6.6.8
Proper segregation and disposal of construction
waste should be implemented. Separate containers should be provided for inert
and non-inert C&D materials.
6.6.9
Sorting is important to recover materials for reuse
and recycling. Specific area (i.e.
proposed stockpiling area shown in Figure 6.1) should be
allocated for on-site sorting of C&D materials and to provide a temporary
storage area for those sorted materials.
If area is limited, all C&D materials should at least be sorted
on-site into inert and non-inert components. Non-inert C&D materials such
as bamboo, timber, vegetation, packaging waste and other organic materials
should be reused and recycled to local recycler wherever possible and disposed
to the designated landfill only as a last resort. Inert C&D materials such as concrete,
stone, clay, brick, soil, asphalt and the like should be separated and reused
in this or other projects (subject to approval by the relevant parties in
accordance with the DEVB TC(W) No. 6/2010) before disposed of at a public
filling facility operated by CEDD. Steel
and other metals should be recovered from demolition waste stream and recycled.
6.6.10
The reuse of inert C&D materials such as soil,
rock and broken concrete should be maximised.
Waste should be separated into fine, soft and hard materials. With the use of a crusher, coarse materials
can be crushed to make it suitable for use as fill materials where fill is
required in the works. This minimises
the use of imported materials and maximises the use of the C&D materials
produced. Approval from CEDD and EPD shall be obtained for the use of site
crusher in accordance with WBTC No. 11/2002.
Excavated Materials
6.6.11
Excavated materials should be temporarily stored
on-site for use as backfill as far as possible. It should be properly covered
with tarpaulin or similar impervious sheeting to prevent dust nuisance and site
runoff. Surplus inert C&D materials should be disposed of at public fill
reception facilities:
6.6.12
Control measures for temporary stockpiles on-site
should be taken in order to minimise the noise, generation of dust, pollution
of water and visual impact. These
measures include:
·
Surface of stockpiled soil should be regularly
wetted with water especially during dry season;
·
Disturbance of stockpiled soil should be minimised;
·
Stockpiled soil should be properly covered with
tarpaulin especially when heavy rain storms are predicted;
·
Stockpiling areas should be enclosed where space
is available;
·
Stockpiling location should be away from the
water bodies; and
·
An independent surface water drainage system
equipped with silt traps should be installed at the stockpiling area.
6.6.13
The Public Fill Committee of CEDD should be
consulted for disposal of inert C&D materials to public fill reception
facilities while EPD should be consulted for disposal of non-inert C&D
materials to landfill. Disposal of
C&D materials to landfill must not have more than 50% (by weight) inert
material. The C&D materials delivered
for landfill disposal should contain no free water and the liquid content
should not exceed 70% by weight.
6.6.14
In order to avoid dust impacts, any vehicle leaving
a works area carrying inert or non-inert C&D materials should have their
load covered up before leaving the construction site.
6.6.15
C&D materials should be disposed of at
designated public fill reception facilities or landfills. Disposal of these materials for the use at
other construction projects is subject to the approval of the Engineer and/or other
relevant reception authorities.
Furthermore, unauthorised disposal of C&D materials in particular on
private agricultural land is prohibited and may be subject to relevant
enforcement and regulating actions. The
disposal of C&D materials will be controlled through trip-ticket system in
accordance with DEVB TC(W) No. 6/2010.
Chemical Waste
6.6.16
Should any chemical waste be generated, the contractor/operator
must register with EPD as a chemical waste producer. Wastes classified as chemical wastes are
listed in the Waste Disposal (Chemical Waste) (General) Regulation. These
wastes are subject to stringent disposal routes. EPD requires information on the particulars
of the waste generation processes including the types of waste produced, their
location, quantities and generation rates. An updated list of licensed chemical
waste collector can be obtained from EPD.
6.6.17
Storage, handling, transport and disposal of
chemical waste should be arranged in accordance with the Code of Practice on
the Packaging, Labelling and Storage of Chemical Wastes published by EPD, and
should be collected by a licensed chemical waste collector.
6.6.18
Suitable containers should be used for specific
types of chemical wastes. The containers should be properly labelled (in
English and Chinese in accordance with instructions prescribed in Schedule 2 of
the Regulations), resistance to corrosion, stored safely and closely
secured. Stored volume should not be
kept more than 450 liters unless the specification has been approved by the EPD. Storage
area should be enclosed by three sides by a wall, partition of fence that is at
least 2 m height or height of tallest container with adequate ventilation and
space.
6.6.19
Hard standing, impermeable surfaces draining via
oil interceptors should be provided in works area compounds. Interceptors should be regularly emptied to
prevent release of oils and grease into the surface water drainage system after
accidental spillages. The interceptor
should have a bypass to prevent flushing during periods of heavy rain. Oil and fuel bunkers should be bunded and/or
enclosed on three sides to prevent discharge due to accidental spillages or
breaches of tanks. Bunding should be of
sufficient capacity to accommodate 110% of the volume of the largest container
or 20% of the total volume of waste, whichever is largest. Waste collected from any oil interceptors
should be collected and disposed of by a licensed collector.
6.6.20
Lubricants, waste oils and other chemical wastes
are likely to be generated during the maintenance of vehicles and mechanical
equipment. Used lubricants should be
collected and stored in individual containers which are fully labelled in
English and Chinese and stored in a designated secure place. The chemical waste shall be collected by
licensed chemical waste collectors.
6.6.21
The registered chemical waste producer (i.e. the
contractor) has to arrange for the chemical waste to be collected by licensed
collectors. The licensed collector
should regularly take chemical waste to a licensed chemical waste treatment
facility (such as the CWTC in Tsing Yi).
A trip ticket system operates to control the movement of chemical
wastes.
6.6.22
No lubricants, oils, solvents or paint products
should be allowed to discharge into water courses, either by direct discharge,
or as contaminants carried in surface water runoff from the construction site.
General Refuse
6.6.23
General refuse should be disposed of to landfill as
designated by EPD only after recyclable materials (e.g. paper, metals, aluminum
cans, etc.) have been sorted out.
6.6.24
The contractor should nominate approved site
personnel to be responsible for good site practices, arrangements for
collection and effective disposal to an appropriate facility of all wastes
generated at the site. Training of site personnel about site cleanliness,
proper waste management and chemical handling procedures should be provided.
Recyclable materials such as papers and aluminum cans should be separated and
delivered to the local recyclers. An adequate number of waste containers should
be provided to avoid spillage of waste.
6.6.25
General refuse generated on-site should be stored
in enclosed bins or skips and collected separately from other construction and
chemical wastes and disposed of at designated landfills by reputable waste
collector. The removal of waste from the site should be arranged on a daily
basis or at least on every second day by the contractor to minimise any
potential odour impacts, minimise the presence of pests, vermin and other
scavengers and prevent unsightly accumulation of waste.
Operation Phase
6.6.26
The general refuse and chemical waste generated
during the operation phase would follow the same handling procedures and
disposal method presented in Sections
6.6.16 to 6.6.25. It is expected
that there would be limited quantities of general refuse and chemical waste to
be generated from the operation of the Project and will be properly handled by
licensed chemical waste collectors and reputable waste collector. Waste
monitoring and audit programme for the operation phase of the Project would not
be required.
6.7.1
With the implementation of proper waste management
practices for storage, handling, transportation and disposal of waste arisings,
no adverse residual impacts are expected during the construction and
operational phases of the Project.
6.8.1
No monitoring is required during construction
phase. Weekly audit of waste management practice is recommended during the
construction phase of the Project to determine if waste is being managed in
accordance with prescribed waste management procedures and the EMP. The audits
should examine all aspects of waste management including waste generation,
storage, recycling, treatment, transportation, and disposal.
6.8.2
No monitoring and audit is required for the
operation phase of the Project.
6.9.1
C&D materials will inevitably be produced during the construction phase of
the Project. Waste generated during construction works include inert C&D
materials, non-inert C&D materials, chemical waste and general refuse.
Approximately 286,333 m3 of inert C&D materials would be
generated of which 44,047 m3 would be reused on-site and 242,286 m3
would be disposed of at TKO Area 137 Fill Bank.
Approximately 4,879 m3 of non-inert C&D materials would
be generated of which 3,416 m3 would be recycled and 1,463 would be
disposed of at SENT Landfill. It is estimated that about 50 litres of chemical
waste would be generated per month and collected by licensed chemical waste
collector for disposal at licensed treatment facilities. A 65 kg of general
refuse would be generated per day and collected by waste collector for disposal
of at waste transfer/disposal facilities and then to landfill. As the relocated
DHSRs are mainly for the water storage and pumping stations of fresh water and
flushing water, only small amount of general waste and chemical waste would be
generated during operation phase.
6.9.2
With
the implementation of the mitigation measures during the construction and
operation phases of the Project, no significant impact on waste management is
anticipated. The implementation of the
mitigation measures shall form part of the works contracts. Regular site
inspections are recommended during construction phase to ensure the measures
are implemented properly.
END OF TEXT