The criteria for evaluating waste management implications are stated in Annex 7 of the EIAO-TM. Annex 15 of the EIAO-TM prescribes the general approach and methodology for
assessing the waste management implications caused by a project or proposal.
The
following legislation covers the handling, treatment and disposal of wastes in
Hong Kong which are relevant to the types of waste to be generated from the
Project, and has been considered in the assessment.
§ Waste
Disposal Ordinance (WDO) (Cap 354);
§ Waste
Disposal (Chemical Waste) (General) Regulation (Cap 354C);
§ Buildings
Ordinance (Cap 123);
§ Land
(Miscellaneous Provisions) Ordinance (Cap 28); and
§ Public Health
and Municipal Services Ordinance (Cap 132) - Public Cleansing and
Prevention of Nuisances Regulation.
The
WDO prohibits the unauthorised
disposal of wastes, with waste defined as any substance or article which is
abandoned. Under the WDO, wastes can only be disposed of at
licensed waste disposal sites. A breach
of these regulations can lead to the imposition of a fine and/or a prison
sentence. The WDO also provides for the issuing of licences for the collection
and transport of wastes. Licences for
the collection and transport of construction waste or trade waste, however, are
not issued currently.
The
Waste Disposal (Charges for Disposal of
Construction Waste) Regulation defined construction waste as any substance,
matters or 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
Construction Waste Disposal Charging
Scheme came into operation on 1 December 2005. Processing of account applications by the EPD
started on the same day. A contractor
who undertakes construction work with value of HK$1 million or above is
required to open a billing account solely for the contract. Charging for the disposal of construction
waste started on 20 January 2006.
Depending
on the percentage of inert materials in the material, construction waste can be
disposed of at public fill reception facilities, construction waste sorting
facilities, landfills and outlying islands transfer facilities, where differing
disposal costs would be applied. This
scheme encourages waste reduction and hence minimise the costs of the
Contractor or Project Proponent.
Table
6.1
summarises the Government waste disposal facilities for construction waste and
various charge levels.
Table 6.1 Government Waste Disposal Facilities for
Construction Waste
|
Government Waste Disposal Facilities |
Type of Construction Waste Accepted |
Charge per Tonne (a) |
|
Public fill reception
facilities |
Consisting entirely of inert construction waste (b) |
HK$71 |
|
Sorting facilities |
Containing more than 50% by weight of inert construction waste (b) |
HK$175 |
|
Landfills (c) |
Containing not more than 50% by weight of inert construction waste (b) |
HK$200 |
|
Outlying Islands
Transfer Facilities (c) |
Containing any percentage of inert construction waste (b) |
HK$200 |
|
Notes: (a)
Except for the Outlying Islands Transfer Facilities, the minimum
charge load is 1 tonne, i.e. if a load of waste weighs 1 tonne or less, it
will be charged as 1 tonne. A load of
waste weighing more than 1 tonne will be charged at 0.1 tonne increment. For Outlying Islands Transfer Facilities,
the charge is $20 per 0.1 tonne and the minimum charge load is 0.1
tonne. (b)
Inert construction waste means rock, rubble, boulder, earth,
soil, sand, concrete, asphalt, brick, tile, masonry or used bentonite. (c)
If a load of waste contains construction waste and other wastes,
that load will be regarded as consisting entirely of construction waste for
the purpose of calculating the applicable charge. |
||
Chemical
waste as defined under the Waste Disposal
(Chemical Waste) (General) Regulation includes any substance being scrap
material, or unwanted substances specified under Schedule 1 of the Regulation,
if such a substance or chemical occurs in such a form, quantity or
concentration so as to cause pollution or constitute a danger to health or risk
of pollution to the environment.
Chemical
waste producers shall register with the EPD.
Any person who contravenes this requirement commits an offence and is
liable to a fine and imprisonment.
Producers of chemical wastes must treat their wastes, utilising on-site
plants licensed by the EPD or have a licensed collector take the wastes to a
licensed facility. For each consignment
of wastes, the waste producer, collector and disposer of the wastes must sign
all relevant parts of a computerised trip ticket. The system is designed to allow the transfer
of wastes to be traced from cradle-to-grave.
The
Regulation prescribes the storage
facilities to be provided on site including labelling and warning signs. To minimise the risks of pollution and danger
to human health or life, the waste producer is required to prepare and make
available written procedures to be observed in the case of emergencies due to
spillage, leakage or accidents arising from the storage of chemical
wastes. He/she must also provide
employees with training in such procedures.
Regulation
of private projects, as opposed to government public works projects, is subject
to the Buildings Ordinance (BO) and
relevant Practice Notes for Authorised
Persons, Registered Structural Engineers and Registered Geotechnical Engineers
(PNAPs). Measures have been introduced
under PNAP ADV-19 Construction and
Demolition Waste, to enhance the management of construction and demolition (C&D)
materials, and to minimise its generation at source. The enhancement measures include:
§ Identifying opportunities to prevent waste during both
the project planning and design stage as well as construction stage; and
§ Requiring the contractor to prepare a Waste Management
Plan (WMP) including areas described in PNAP
ADV-19 and submit to the project proponent for agreement.
The
inert portion of construction waste ([1]) (also called public fill) may be
taken to public fill reception facilities.
Public fill reception facilities are operated by the Civil Engineering
and Development Department (CEDD). The Land (Miscellaneous Provisions) Ordinance requires
that individuals or companies who deliver public fill to the public fill
reception facilities to obtain Dumping Licences. The licences are issued by the CEDD under
delegated authority from the Director of Lands.
Under
the licence conditions, public fill reception facilities will only accept inert
earth, soil, sand, rock, boulder, rubble, brick, tile, concrete, asphalt,
masonry or used bentonite. In addition,
in accordance with paragraph 11 of Development
Bureau (DevB) Technical Circular (Works) (DevB TC(W)) No. 6/2010), the
Public Fill Committee will advise on the acceptance criteria (eg no mixing of
construction waste, nominal size of the materials less than 250mm, etc.). The material should, 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.
This Regulation provides further control on the illegal dumping of
wastes on unauthorised (unlicensed) sites.
The illegal dumping of wastes can lead to a fine and/or imprisonment.
Other relevant guidance and
planning documents, which detail how the Project Proponent or Contractor should
comply with the local regulations, are as follows:
§ Waste
Disposal Plan for Hong Kong (December
1989), Planning, Environment and Lands Branch Government Secretariat, Hong Kong
SAR Government;
§ A Guide to
the Chemical Waste Control Scheme;
§ A Guide to
the Registration of Chemical Waste Producers;
§ Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes (1992), EPD,
Hong Kong SAR Government;
§ Hong Kong
Planning Standards and Guidelines Planning (2014),
Planning Department, Hong Kong SAR Government;
§ WBTC No. 2/93
- Public Dumps, Works Branch, Hong Kong SAR Government;
§ WBTC No.
2/93B - Public Filling Facilities, Works
Branch, Hong Kong SAR Government;
§ WBTC No.
16/96 - Wet Soil in Public Dumps, Works
Branch, Hong Kong SAR Government;
§ Waste
Reduction Framework Plan, 1998 to 2007, Planning,
Environment and Lands Bureau, Government Secretariat, 5 November 1998;
§ WBTC No. 4/98
and 4/98A - Use of Public Fill in Reclamation and Earth Filling Projects, Works
Bureau, Hong Kong SAR Government;
§ Project
Administration Handbook for Civil Engineering Works, Section 3.3(i) of Chapter
2 and Section 4.13 of Chapter 4 - Incorporation of Information on Construction
and Demolition Material Management in Public Works Subcommittee Papers, Hong Kong
SAR Government;
§ WBTC No.
12/2000 - Fill Management, Works
Bureau, Hong Kong SAR Government;
§ WBTC No.
19/2001 - Metallic Site Hoardings and Signboards, Works
Bureau, Hong Kong SAR Government;
§ Project
Administration Handbook for Civil Engineering Works, Section 21.25 of Chapter 7
and Section 9.12 of Chapter 5 - Control of Site Crushers, Hong Kong
SAR Government;
§ WBTC No.
12/2002 - Specifications Facilitating the Use of Recycled Aggregates, Works
Bureau, Hong Kong SAR Government;
§ Project
Administration Handbook for Civil Engineering Works, Section 4.1.3 of Chapter 4
- Management of Construction and Demolition Material Including Rock, Hong Kong
SAR Government;
§ ETWB TC(W)
No. 19/2005 - Environmental Management on Construction Sites,
Environment, Transport and Works Bureau, Hong Kong SAR Government; and
§ DevB TC(W)
No. 6/2010 - Trip Ticket System for Disposal of Construction & Demolition
Materials, Development Bureau, Hong Kong SAR Government;
§ DEVB TC(W)
No. 08/2010 - 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;
§ Hong Kong
Blueprint for Sustainable Use of Resources 2013 – 2022,
Environment Bureau, Hong Kong SAR Government; and
§ Waste
Blueprint for Hong Kong 2035, Environment
Bureau, Hong Kong SAR Government.
During
the decommissioning/ demolition and construction phases, the main activities
that will potentially result in generation of waste include demolition of the
existing GTs (i.e. GT2 to GT7), BSGT and other auxiliary equipment,
construction of new OCGTs and associated civil works, cable trenches
construction and cable laying, construction of the new staircase and lift, as
well as reconstruction inside GTAB. The
typical waste types associated with these activities include:
§ C&D materials from demolition and removal of existing
units and associated equipment / parts;
§ Excavated materials (soil and rock) from the construction
of new cables trenches and new staircase and lift as well as reconstruction
works inside GTAB;
§ C&D materials from minor civil works;
§ Chemical waste from decommissioning of existing units,
maintenance of construction plant and equipment, and commissioning of new
units; and
§ General refuse from construction workforce.
The
existing GTs and their auxiliaries (e.g. transformers, generator coolers) will
be demolished to make space for the construction of the new units. The main lube oil tank adjacent to GT5, the
BSGT, the miscellaneous storage shed next to the BSGT, as well as existing
equipment and Turbo Block structure inside the GTAB will also be demolished and
removed as part of the Project.
Approximately
600m3 of broken concrete is estimated to be generated from the
demolition of the Turbo Block structure within the GTAB and, assuming a bulking
factor of 1.2, the bulk volume of broken concrete waste is about 720m3. The existing foundation and reinforced
concrete structures of the existing units will be reused for the new units as
far as practicable and thus broken concrete arising from the demolition of
existing units would be minimal.
C&D
materials arising from the demolition of the existing GT2 to GT7 will be
primarily scrap metals from the demolition of the aboveground steel structures siting
on top of the existing reinforced concrete structures. With an estimation of approximately 700 tonnes
of scrap metals to be generated from the demolition of each of GT2, GT3, GT4
and GT6, and approximately 850 tonnes of scrap metals from the demolition of
each of GT5 and GT7, a total of about 4,500 tonnes of scrap metals are expected
to be generated from the demolition of all existing units (i.e. GT2 to GT7). The scrap metal produced will be sent to
recycler for recycling as far as practicable.
Other C&D materials generated from the demolition works (e.g. plastics,
timber, cardboard) would be minimal, with an estimated quantity of about 100m3
of non-inert C&D materials (excluding scrap metals) to be generated from
the demolition works.
The
C&D materials will be segregated at source and temporarily stored on
site. The C&D materials will be
transported to the existing LPS jetty and delivered off-site for recycling or disposal
at landfills and public fill reception facilities. According to the tentative implementation
programme, GT57 will be demolished between 2022 and 2023, while the remaining
GT2, GT3, GT4 and GT6 will all be demolished in 2025. It is estimated that the generation of the
C&D materials arising from the demolition works during the peak year of
2025 will require about 1 barge trip per two weeks on average for off-site
disposal or recycling. In view of the
limited number of barge trips required, adverse marine traffic impact as well
as environmental impact (including dust, noise, water quality) arising from the
demolition of the Project is not expected with implementation of good
construction site practices.
Excavated
materials will be generated from the construction of the new cable trenches
across the GT compound and the new staircase and lift at the immediate east of
the GTAB. Minor excavation will also be
required at the existing Turbo Block structure to be demolished within the GTAB
as part of its conversion to the new 132kV Switching Station. Given that the new cable trenches will be about
1.8m in depth, 1.5m in width and 1,240m in length within the GT Compound, it is
estimated that about 3,348m3 of excavated materials will be
generated from the construction of the new cable trenches. Applying a bulking factor of 1.2, the bulk
volume of the excavated material is about 4,018 m3. The construction of the new staircase and
lift will require excavation down to 5m below ground and, given its
construction footprint of about 10m x 5m, will generate approximately 250m3
of excavated materials. Applying a
bulking factor of 1.2, the bulk volume of the excavated material is about 300 m3.
Furthermore, considering the need to
excavate down to 2.6m below ground over an area of about 200m2
within the GTAB, it is estimated that an addition of approximately 520m3
will be generated, with a bulk volume of 624m3 when applying a
bulking factor of 1.2. Therefore, the
total quantity of excavated materials generated is expected to be about 5,000 m3. The excavated materials, which mainly
comprise top soil and artificial hard materials (i.e. broken concrete and
asphalt), will be reused for backfilling on site as far as practicable before
being disposed of off-site at the public fill reception facilities.
The
construction of the new cable trenches and the new staircase and lift, as well
as reconstruction works in GTAB will tentatively commence in 2023 and these are
expected to last for about 18 months.
Therefore, about 5 barge trips in total ([2]) over a period of 18 months (i.e.
about 1 barge trip per 3-4 months on average) will be required for off-site
disposal of the excavated materials, assuming a worst case of no excavated
materials can be reused on site. In view
of the limited number of barge trips required, adverse marine traffic impact as
well as environmental impact (including dust, noise, water quality) due to
off-site disposal of the excavated materials is not anticipated with
implementation of good construction site practices.
C&D
materials (consisting of waste concrete, wood, packing materials, plastics, etc.)
will be generated from the construction of the new units and the new staircase
and lift at the immediate east of the GTAB.
As most of the major equipment and piping associated with the new units
will be fully assembled off-site and then installed on site, civil works and
the associated C&D material generation from the construction of the new
units on site are expected to be minimal (about 100m3) ([3]).
There is no construction of new buildings under the Project except for
the new staircase and lift. Based on the
limited footprint of the new staircase and lift (i.e. 10m x 5m), the C&D
materials to be generated are also expected to be minimal ([4]). The
C&D materials produced on-site will be sorted on-site into an inert portion
(i.e. public fill) and non-inert portion (i.e. construction waste). Recyclables, such as plastics and cardboard,
will be segregated for recycling as far as practicable.
Public fill and construction waste will be delivered to the public fill
reception facilities and landfills, respectively, while the recyclables will be
sent to recyclers for recycling. As the
quantity of C&D materials to be generated from civil works under the
Project are expected to be minimal, the handling, transportation and disposal
of the associated C&D materials would not cause unacceptable marine traffic
impact or other environmental impact (including dust, noise, water quality) with
the implementation of good construction site practices.
Chemical
waste, as defined under the Waste
Disposal (Chemical Waste) (General) Regulation, includes any unwanted
substances specified under Schedule 1 of
the Regulation. Substances likely to be generated from the decommissioning/
demolition and construction of the Project will include:
§ Leftover diesel, petroleum products or chemicals within
the existing units and equipment to be demolished;
§ Used paint, engine oils, hydraulic fluids and waste fuel;
§ Spent mineral oils/cleaning fluids from mechanical
machinery; and
§ Spent solvents/ solutions from equipment cleaning
activities.
Chemical
wastes may pose environmental, health and safety hazards if not stored and
disposed of in an appropriate manner as outlined in the Waste Disposal (Chemical Waste) (General) Regulation and the Code of Practice on the Packaging, Labelling
and Storage of Chemical Wastes.
These hazards may include:
§ Toxic effects to workers;
§ Adverse effects on air, water and land from spills; and
§ Fire hazards.
It
is difficult to quantify the exact amount of chemical waste that will arise
from the construction activities since it will be highly dependent on
contractor’s on-site maintenance activities and the quantity and/or types of
plant and equipment utilised. Varying
quantity of chemical waste may also be generated from leftover diesel,
petroleum products or chemicals from the existing units, tanks and equipment,
as well as cleaning of the existing units, tanks and equipment to be demolished
under the Project. With respect to the
scale of the decommissioning/ demolition and construction activities, it is
anticipated that the quantity of chemical waste to be generated is about a few
hundred litres per month throughout the decommissioning/ demolition and
construction of the Project. The
chemical waste will be collected by licensed chemical waste collectors and
delivered to the licensed chemical waste treatment facilities for disposal
(i.e. Chemical Waste Treatment Centre (CWTC) in Tsing Yi).
In
addition to the chemical waste that will be generated from the decommissioning/
demolition and construction activities, chemical waste will also be generated
from the use of lube oil for flushing during the testing and commissioning of
the new units. It is expected that
approximately 54,000 litres of lube oil will be used for flushing for each new
unit and will be disposed of at the CWTC via licenced chemical waste
collectors.
With
the incorporation of suitable arrangements for the storage, handling,
transportation and disposal of chemical wastes under the requirements stated in
the Waste Disposal (Chemical Waste)
(General) Regulation and the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes, no
adverse environmental impact (including air and odour, noise, water quality) or
other hazards will result from the handling, transportation and disposal of
chemical waste arising from the Project.
The presence of a construction site with workers and associated site
office will result in the generation of general refuse (mainly consists of food
waste,
aluminium cans, plastic bottles, waste paper and glass bottles) which requires
off-site disposal. The storage of
general refuse has the potential to give rise to adverse environmental impacts,
if not properly managed. These include
odour if the waste is not collected frequently, windblown litter and visual
impact.
It is conservatively estimated that a maximum of about 250 construction
workers will be working on site at any one time during the demolition and
construction phases of the Project. With
a general refuse generation rate of 0.65 kg per worker per day, the maximum
amount of general refuse to be generated by the construction workforce will be
about 162.5 kg per day.
To reduce the quantity of general refuse to be disposed of at landfill,
recyclable materials (i.e. paper, plastic bottles, aluminium cans and glass bottles) will
be segregated on-site for off-site recycling, as far as practicable. Adequate number of enclosed waste containers
and recycling bins will be provided to avoid over-spillage of waste and/ or
recyclable materials.
The non-recyclable refuse will be placed in bags and collected together with
other general refuse generated from the LPS by existing waste management
contractor at LPS, and subsequently disposed of at the landfills on a daily
basis. Given that the quantity of
general refuse to be disposed of at the landfills is small, no adverse impact
on the operation of the landfills is anticipated.
With the implementation of the mitigation measures recommended in Section
6.5.1, no adverse environmental impacts (including air and odour,
noise, water quality) caused by storage, handling, transport and disposal of
general refuse are expected.
During
the operation of the new units (i.e. the OCGTs and BSGT), the major waste types
to be generated include:
§ Chemical waste from maintenance of the plant and
equipment; and
§ General refuse from site operation.
The
major types of chemical waste expected to be generated from the operation and
maintenance of the new units include oil contaminated items, paint contaminated
items, spent lubricant, solvent, etc., similar to those generated by the
existing units. The quantity of chemical
waste to be generated is also expected to be similar to those generated by the
existing units and is estimated to be about a few hundred litres per
month. All chemical waste will be
collected by licenced chemical waste collectors and delivered to the CWTC for
disposal. With the incorporation of
suitable arrangements for storage, handling, transportation and disposal of
chemical wastes in accordance with the requirements stated in the Waste Disposal (Chemical Waste) (General)
Regulation and the Code of Practice
on the Packaging, Labelling and Storage of Chemical Wastes, no adverse
environmental impact (including air and odour, noise, water quality) or other
hazards will result from the handling, transportation and disposal of chemical
waste arising from the operation of the Project.
General
refuse will arise from the site staff and site operation. General refuse may consist of food waste,
plastic, glass bottles, waste paper, scrap metals etc. Source separation with the provision of
recycling bins will continue to be conducted under the operation of the new
units following existing waste management practices at LPS. Recyclable materials (i.e. paper and metals)
will be separated for recycling, in order to reduce the amount of general
refuse to be disposed of at landfill. As
there will be no change in the number of site staff and that site operation
with the new units remains largely the same as the existing operation, the
quantity of general refuse to be generated during the operation of the Project
is expected to be similar to that generated during existing operation.
The
non-recyclable waste will be delivered to the landfills on a daily basis
following existing waste management arrangement at LPS. As the general refuse to be disposed of at
the landfills under the operation of the Project is of similar and small
quantity as in existing operation, no adverse impact on the operation of the
landfills is anticipated. With the
implementation of the mitigation measures recommended in Section 6.5.2, no adverse
environmental impacts (including air and odour, noise, water quality) caused by
the storage, handling, transport and disposal of general refuse are expected.
The
assessment indicates that with the implementation of the proposed waste
management practices at the work site, no adverse environmental impacts are
envisaged for the handling, collection and disposal of waste arising during the
decommissioning/ demolition and construction phases of the Project.
This
Section further describes the good
construction site practices to avoid or further reduce the potential
environmental impacts associated with the handling, collection and disposal of C&D
materials, chemical waste and general refuse arising from the decommissioning,
demolition and construction works.
The
contractor(s) must ensure that all the necessary waste disposal permits or
licences are obtained prior to the commencement of the decommissioning/
demolition and construction works.
The
contractor(s) will open a billing account with the EPD in accordance with the Waste Disposal (Charges for Disposal of
Construction Waste) Regulation.
Every construction waste or public fill load to be transferred to
Government waste disposal facilities (e.g. public fill reception facilities,
sorting facilities and landfills) will be provided with a valid “chit” which
contains the information of the account holder to facilitate waste transaction
recording and billing to the waste producer.
A trip-ticket system will also be established in accordance with DevB TC(W) No. 6/2010 to monitor the
disposal of construction waste at landfill and to control fly-tipping. The trip-ticket system will be included as
one of the contractual requirements and implemented by the contractor(s).
Scrap
metals generated from the demolition of aboveground steel structures and other
recyclables (e.g. plastics,
timber, cardboard)
generated during the decommissioning/ demolition and construction phases will
be segregated and sent to recycler for recycling as far as practicable.
A
waste management plan (WMP) as stated in the PNAP ADV-19 for the amount of waste generated, recycled and
disposed of (including the disposal sites) will be established and implemented
during the decommissioning/ demolition and construction phases as part of the
Environmental Management Plan (EMP). The
Contractor will be required to prepare the EMP and submit it to the Architect/
Engineer under the Contract for approval prior to implementation.
C&D materials will be segregated on-site into public fill and
construction waste and stored in different containers or skips to facilitate
reuse of the public fill and proper disposal of the construction waste. Specific areas of the Project site will be
designated for such segregation and storage if immediate use is not
practicable. Prefabrication will be
adopted as far as practicable to reduce the construction waste arisings.
The
contractor(s) will register as a chemical waste producer with the EPD. Chemical waste will be handled in accordance
with the Code of Practice on the
Packaging, Handling and Storage of Chemical Wastes as listed below.
Containers
used for storage of chemical wastes will:
§ Be suitable for the substance they are holding, resistant
to corrosion, maintained in a good condition, and securely closed;
§ Have a capacity of less than 450 L unless the
specifications have been approved by the EPD; and
§ Display a label in English and Chinese in accordance with
instructions prescribed in Schedule 2
of the Regulations.
The
storage area for chemical wastes will:
§ Be clearly labelled and used solely for the storage of
chemical waste;
§ Be enclosed on at least 3 sides;
§ Have an impermeable floor and bunding, of capacity to
accommodate 110% of the volume of the largest container or 20% by volume of the
chemical waste stored in that area, whichever is the greatest;
§ Have adequate ventilation;
§ Be covered to prevent rainfall entering (water collected
within the bund must be tested and disposed of as chemical waste, if
necessary); and
§ Be arranged so that incompatible materials are
appropriately separated.
Chemical waste will be disposed of:
§ Via a licensed waste collector; and
§ To a facility licensed to receive chemical waste, such as
the CWTC which also offers a chemical waste collection service and can supply
the necessary storage containers.
General
refuse will be stored in enclosed bins separately from C&D materials and
chemical wastes. General refuse will be
delivered separately from C&D materials and chemical wastes for offsite
disposal on a daily basis to reduce odour, pest and litter impacts.
Recycling
bins will be provided at strategic locations within the Project site to
facilitate recovery of recyclable materials (including aluminium can, waste
paper, glass bottles and plastic bottles) from the Project site. Materials recovered will be sold for recycling.
In
addition, to avoid any odour and litter impact, portable toilets will be
provided for workers on-site where appropriate.
At
the commencement of the decommissioning/ demolition and construction works,
training will be provided to workers on the concepts of site cleanliness and on
appropriate waste management procedures, including waste reduction, reuse and
recycling.
The
measures for management of chemical waste during operation phase are similar to
those outlined in Section 6.5.1.3.
Management
approach of general refuse arises from the on-site operators and visitors to
the plant during operation phase will be similar to that in construction
phase. General refuse and
non-recyclables will be stored in enclosed bins and collected by existing waste
management contractor at LPS for disposal at the landfills on a daily basis for
avoidance of pest and odour nuisance.
Recycling bins for recyclable materials (including aluminium can, waste
paper, glass bottles and plastic bottles) will be placed at the site office and
transported off-site for recycling on a regular basis.
No
residual environmental impact related to waste management is envisaged during
the decommissioning/ demolition, construction and operation phases of the
Project.
It
is recommended that regular site inspections of the waste management practices would
be carried out during the decommissioning/ demolition and construction phases
to determine if wastes are being managed in accordance with the recommended
good site practices and WMP. The site inspections
will investigate all aspects of waste management including waste generation,
storage, handling, recycling, transportation and disposal.
As the operation of the new units and associated
equipment will generate minimal quantity of waste and no adverse environmental
impacts will arise with the implementation of standard waste management
practices at LPS, waste monitoring and audit programme
for the operation of the new units and associated equipment under the Project will
not be required.
With
the implementation of good site practices, adverse environmental impacts
(including air and odour, noise and water quality) or other hazards arising
from the management and disposal of waste during the decommissioning/
demolition, construction and operation phases are not anticipated.
The
estimated waste arisings and recommend waste management arrangements during the
decommissioning/ demolition, construction and operation phases of the Project
are summarised in Table 6.2.
Table 6.2 Summary of Estimated Waste Arisings and
Recommended Waste Management Arrangements
|
Types of Waste |
Approximate Quantity |
Waste Management Arrangements |
|
Decommissioning/ Demolition and
Construction Phase |
||
|
C&D materials
(demolition works) |
Scrap
metals: 4,500 tonnes |
§ Off-site
recycling § Disposed
of at landfill sites directly or via Outlying Island Transfer Facilities |
|
Other
non-inert C&D materials (e.g. plastics, timber, cardboard): 100m3 |
§ On-site
segregation and off-site recycling, or disposed of at landfill sites directly
or via Outlying Island Transfer Facilities |
|
|
Inert
C&D materials (e.g. broken concrete): 720m3 |
§ Sent to public
fill reception facilities directly or Outlying Island Transfer Facilities |
|
|
C&D materials
(civil works) |
Inert
C&D materials: 84m3 |
§ Sent to
public fill reception facilities directly or Outlying Island Transfer
Facilities |
|
Non-inert
C&D materials: 21m3 |
§ On-site
segregation and off-site recycling, or disposed of at landfill sites directly
or via Outlying Island Transfer Facilities |
|
|
Excavated materials |
5,000m3 |
§ On-site
reuse for backfilling § Sent to
public fill reception facilities directly or Outlying Island Transfer
Facilities |
|
Chemical waste |
Few hundred litres per month (b) |
§ Disposed
of at CWTC or other licensed chemical waste treatment facilities |
|
General refuse |
162.5kg per day |
§ Recyclable
materials: on-site sorting and off-site recycling § Non-recyclable
refuse: disposed of at landfill sites directly or via Outlying Island
Transfer Facilities |
|
Operation Phase |
||
|
Chemical waste |
Few hundred litres per month |
§ Disposed
of at CWTC or other licensed chemical waste treatment facilities |
|
General refuse |
Insignificant quantity (a) |
§ Recyclable
materials: on-site sorting and off-site recycling § Non-recyclable
refuse: disposed of at landfill sites directly or via Outlying Island
Transfer Facilities |
|
Note: (a) Insignificant
quantity of general refuse with respect to operation of the new units under
the Project. (b) An
addition of about 54,000L of waste lube oil will be generated from testing
and commissioning of each unit and will also be disposed of at CWTC or other
licensed chemical waste treatment facilities. |
||
([1]) “Construction waste” refers to materials arising from any land
excavation or formation, civil/building construction, road works, building
renovation or demolition activities. It
includes various types of reusable materials, building debris, rubble, earth,
concrete, timber and mixed site clearance materials. When sorted properly, materials suitable for
land reclamation and site formation (known as public fill) should be reused at
public fill reception facilities. The
rock and concrete can be crushed and processed to produce aggregates for
various civil and building engineering applications. The remaining construction waste (comprising
timber, paper, plastics, and general refuse) are to be disposed of at
landfills.
([3]) Assuming 80% inert and 20% non-inert C&D materials, there would be 80m3 of inert C&D materials and 20m3 of non-inert C&D materials.
([4]) Assuming generation rate of 0.1m3 per m2 of GFA constructed with reference to Hong Kong Polytechnics (March 1993) Reduction of Construction Waste Final Report, the amount of C&D materials generated from the construction of the new staircase and lift is about 5m3, of which 4m3 is inert and 1m3 is non-inert C&D materials.