Construction
and Demolition Materials
8.1.1
The waste assessment examines the
quantity, quality and timing of potential sources of waste which will arise
from the construction and operation of the proposed secondary drainage channel
KT13. Both construction waste and solid waste are considered. Solid waste
includes domestic waste, commercial and industrial waste, chemical waste,
special wastes and other wastes, while construction and demolition waste
includes most wastes arising from the construction. Where unacceptable waste
impacts are identified, appropriate mitigation measures are recommended.
Disposal options are outlined for each type of waste, and the responsibilities
for disposal or recycling discussed.
8.1.2
The
methodology follows the criteria laid out in the Technical Memorandum on EIA
Process (Annexes 7 and 15). The principal legislation regulating waste is the
Waste Disposal Ordinance (WDO) (Cap 354).
8.1.3
The
main objectives of the waste assessment are to:
(i)
identify the sources, volumes,
quality and timing of wastes arising from the construction activities;
(ii)
recommend construction waste
management strategies and control measures/routings (including final disposal
sites) in accordance with the current legal and administrative requirements for
the disposal of construction waste, including waste reduction, re‑use and
recycling for inclusion into contract documents; and
(iii)
recommend measures for the disposal
of inert materials and wastes.
Waste
from Operation of Project
8.1.4
Approximately 20m³ of inert silty
material will arise during annual clearance of channel bed during dry season.
This will be reused after de-watering in other Public Works Projects (subject
to approval by relevant authorities) or public filling facilities.
8.2
Sources
and Types of Construction and Demolition Materials
8.2.1
Construction waste from this
Designated Project will include waste arising from land excavation, formation,
civil/building construction, or demolition activities. Waste includes various
types of construction debris, rubble, earth, concrete, timber and mixed site
clearance materials.
8.2.2
The drainage channel works will
involve excavation works along some sections of the channel alignment. The main
construction wastes generated from these construction activities will be:
•
site clearance waste/demolition
waste
•
excavated materials (including
contaminated sediments)
•
waste concrete
•
wooden material
•
chemical waste
•
wheel wash waste
•
sewage
•
municipal/domestic waste
Site Clearance
Waste/Demolition Waste
8.2.3
The proposed drainage channel flows
through the villages of Ho Pui and Ma On Kong an area comprising village
houses, agricultural land, fish ponds, pig farms and temporary structures. The
drainage channel also passes through the ecologically important Ho Pui Egretry.
Site clearance works will involve the removal of vegetation (mainly grasses and
shrubs), demolition and building materials (from temporary structures and
village houses) and a small portion of the available topsoil. Some contaminated
sediments will also be removed.
8.2.4
Demolition of temporary structures
and houses will generate concrete rubble, plastics, metal, glass, asphalt from
surfaces, wood and refuse. Some good quality reusable, currently undisturbed
topsoil is expected from site clearance works across agricultural land aligning
the north east section of the channel in particular. This will be re-used later
in final landscaping works. The twin box bypass culvert connecting the two
channelised stream sections will be located at fishponds filled by excavation materials
from other projects. This material consists of an assortment of inert rubbish
such as plastic and concrete, as well as rubble and mixed soils.
8.2.5
All construction wastes shall be
sorted on site into inert and non inert components. Non inert materials (wood,
glass and plastic) shall be recycled or reused and disposed to landfill as a
last resort. Inert materials (soil, rubble, sand, rock, brick and concrete) shall
be separated and reused on or off site. In case of surplus inert material, it
shall be recycled at the Construction and Demolition (C&D) Material
Recycling Plant at Tuen Mun Area 38 or to public filling areas approved by the
Public Fill Committee (PFC). Scrap metals shall be recovered from demolition
waste and recycled.
Excavated
Materials
General
8.2.6
The majority of materials excavated
will arise from the twin box culvert connecting the two channelised gabion
sections for the formation of the drainage channel through fishponds already
in-filled by spoils from nearby completed civil projects in the Kam Tin area.
It was observed from site visit that most of this material will be inert
rubbish, such as broken concrete, plastics, rubble and mixed soils. This
material is not suitable for re‑use in this Project. It constitutes approximately 50% of all
estimated material required to be disposed off site under this project. Some of
the excavated materials from current river bottoms have been found to be
contaminated sediments, as classified by ETWB TCW No. 34/2002. No suitable
material is likely to be generated from stream beds. Table 8.1 gives a
detailed breakdown of the quantities of surplus materials likely to arise from
each element of the proposed works under the KT13.
8.2.7
Any excavated material from the
stream shall be removed within 1 day of excavation, taking measures to reduce
odour and potential runoff. Some of this material is contaminated with high
levels heavy metals and organics (from surrounding pig farms) and therefore
unsuitable for re-use on site. In this case spoil should be drained and
disposed of in accordance with ETWB TCW No. 34/2002 and WBTC No. 12/2000.
Contaminated Sediments
8.2.8
Sediment
sampling under this study in 2000 showed that heavy metals, particularly zinc
levels were high at 3 of the 4 sediment quality monitoring locations, where
sediments exceeded the Category H sediment classification (under the
classification in the superseded WBTC No. 3/2000). Sampling location KT13B
(Figure 7.1) exceeded Category H levels for all metals tested, except chromium
where it exceeded Category M and cadmium which was below the classification. No
testing of silver, arsenic and PCB was carried out because there was no
evidence to suspect these parameters would be above acceptable levels. Both
sampling locations KT13B and KT13D exceeded Category H sediment classification
for one or more criteria, whilst both KT13A and KT13C exceeded Category M. A
full set of results obtained in 2000 is attached in Appendix G1.
8.2.9
A
detailed Sediment Quality Report (SQR) was conducted in 2005 in accordance with
ETWB TCW 34/2002 to further ascertain the degree of sediment contamination
since the 2000 sampling and to estimate the volume of sediment that required
disposal such that appropriate marine disposal sites can be allocated by the
relevant authorities.
8.2.10
The
result of the 2005 sampling is attached in Appendix G2. According to the
chemical testing results, the sediments are classified as Category L and M,
with high levels of lead and zinc found at KT13B and KT13C. The apparent
improvement of sediment quality compared with the 2000 results is possibly due
to the long time gap coupled with the effective implementation of the Livestock
Waste Control Scheme.
8.2.11
Biological
screening was conducted for the sediments classified as Category M. Biological
testing results (Appendix G2) revealed pass for amphipod test but failed the
polychaete and bivalve tests. According to ETWB TCW 34/2002, the sediment is
deemed to have failed the biological test if it fails in any one of the three
toxicity tests.
8.2.12
For
sediment classified as Category L, the disposal option is Type 1 – Open Sea
Disposal whereas for Category M failing the biological screening, the disposal
option is Type 2 – Confined Marine Disposal. The location of the sediment
sampling, the sediment classification as well as the disposal type are shown in
Figure 8.1.
8.2.13
The
SQR was approved by EPD and subsequently the Marine Fill Committee (MFC) of
CEDD allocated the East Sha Chau facility as the marine disposal site for the
excavated sediment arising from KT13. Under the general allocation conditions
by MFC, the following information should be submitted to the relevant
authorities once they are available.
General
Allocation Conditions for Type 1 –
8.2.14
Prior
to the commencement of dumping the Engineer shall submit to the Director of
Environmental Protection and the Secretary MFC, an estimated programme for the
dumping of mud at the mud disposal site(s) during the contract. This programme
shall be resubmitted whenever significant programme changes occur.
8.2.15
The
Contractor shall submit, through the Engineer, to the Director of Environmental
Protection and the Secretary MFC, monthly returns showing the volumes of
sediments dumped at the mud disposal site(s) in the previous month together
with an estimation of the volumes to be dumped in the following month.
General
Allocation Conditions for Type 2 – Confined Marine Disposal
8.2.16
The Contractor shall submit to
the Director of Environmental Protection, a method statement covering the
disposal of contaminated mud and this method must be approved before a licence
for marine dumping can be issued.
8.2.17
At least one week prior to
commencement of the excavation works, the Engineer shall submit to the
Secretary MFC a programme of work showing the volume of contaminated sediment
to be excavated per month during the term of the contract. Thereafter, on a
monthly basis, the Engineer shall submit a revised programme taking into
account the volume disposed of during the preceding month.
Dumping Permit
8.2.18
The Contractor shall make a
formal application to EPD for a dumping permit under the Dumping at Sea
Ordinance (DASO) (Cap.466). If the permit is granted, the Contractor shall
ensure the permit conditions are met to the satisfaction of EPD.
Mitigation
Measures
8.2.19
Excavation of contaminated
sediments is of particular concern. The Contractor should implement the
proposed water quality mitigation measures (see Chapter 7) to prevent
inadvertent release of contaminated sediment or runoff to the surrounding water
bodies during excavation.
Waste
Concrete
8.2.20
Concrete is the material to be used
in the construction of bypass culvert. Of the volume of concrete supplied, it
is assumed that approximately 3-5% of the concrete used will be lost to waste.
Dry concrete waste will be sorted out from the other wastes and recycled at
recycling plant at Tuen Mun Area 38 to form aggregates for road sub-base.
Wooden Materials
8.2.21
Different kinds of wooden materials
are essential to the construction project, such as wooden boards used as
falsework and formwork for concrete structures, erection of site boundaries, as
well as bamboo for scaffolding. Wooden materials are important and valuable
resources.
8.2.22
All
wooden materials used on site should be kept separate 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. Boards used should be capable of being reused at
least five times, thus keeping the wastage rate down to around 20%. Timber
which cannot be reused again should be sorted and stored separately from all
inert waste before being disposed of to landfill. On-site incineration of
wooden waste is prohibited under the Air Pollution Control Ordinance, Open
Burning Regulation. It is an offence under law to burn construction waste in
open space. On completion of construction phase, remaining reusable wooden
material shall be sorted and used at other construction sites by the same
contractor or sold to other construction sites.
8.2.23
Reusable
steel and concrete panels shall be used as a preferred alternative to wooden formwork,
falsework, and site fencing.
8.2.24
The Contractor shall pay attention
to WBTC No. 19/2001 - Metallic Site Hoardings and Signboards. This was
introduced to reduce the amount of timber used on construction sites.
Chemical Waste
8.2.25
Where the construction processes
produce chemical waste, the Contractor must register with EPD as a Chemical
Waste Producer. Wastes classified as chemical wastes are listed in the Waste
Disposal (Chemical Waste) (General) Regulation. EPD requires information on the
particulars of the waste generation processes including the types of waste
produced, their location, quantities and generation rates. A contact person shall
be registered with EPD. Storage areas for chemical wastes shall have adequate
ventilation and be covered to prevent rain entering.
8.2.26
Storage, handling, transport and
disposal of chemical waste shall be arranged in accordance with the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes published
by EPD.
8.2.27
The main chemical waste types
arising from the construction sites are likely to be engine oils, lubricants,
paints and solvents. Oily waste may be in the form of raw waste, or as sundries
such as spent oil filters, or materials used to absorb oil leaks. Various
storage and disposal measures are recommended in the Code of Practice to
minimize impacts from these chemical sources. The expected quantity of such
waste is limited.
8.2.28
Any construction plant which is
likely to leak oil, shall have absorbent inert material e.g. sand, placed beneath
it. This material shall be replaced on a regular basis and the contaminated
material stored in a designated, secure place.
8.2.29
Lubricants, waste oil, waste paints
and solvents shall be collected by
a licensed collector for chemical waste and disposed at the Chemical Waste
Treatment Centre, Tsing Yi or other licensed facility.
8.2.30
All
vehicles leaving any of the works areas will pass through a wheelwash at the
site access/exit. If, at any time, further entry/exit points are created, they will
be provided with similar facilities. The wheelwash will be regularly cleaned to
remove sediment, a process which may produce muddy wastewater. These
wastewaters shall be directed into settlement ponds. Clarified wheel waste
water will be recycled at the wheel wash facility. Settled sediments will be
dried and disposed in the same way as inert excavated material. The maintenance
of the wheelwash will be the responsibility of the Contractor undertaking the
construction works.
Sewage
8.2.31
Mobile
chemical toilets shall be provided for site staff at locations away from stream
sides. The Contractor shall arrange for regular collection of sewage by
licenced contractors for disposal to government sewer. There will not be any
temporary canteen. It will be the responsibility of the Contractor to ensure
that sewage disposal complies with the standards set out in the Technical
Memorandum on Effluents Discharged into Drainage and Sewerage Systems, Inland
and Coastal Waters.
Municipal/Domestic
Waste
8.2.32
Solid
and liquid wastes will be generated by the construction workers during the
clearance/construction period. The quantity of municipal waste generated is
estimated to be 1.21 kg/employee/day (EPD, 1999). A temporary refuse collection
station shall be set up by the Contractor. Municipal waste shall be collected
regularly and delivered to the Northeast New Territories (NENT) Landfill.
8.2.33
Provision
and collection of skips for different types of recyclable waste is the
responsibility of the Contractor. Arrangements shall be made directly with the
recycling companies, for example, the paper merchants, to collect the waste as
required.
8.3
Quantity of Construction and
Demolition Material Arising from DP
8.3.1
A
summary of the solid waste generated as a result of the construction phase is
presented in Tables 8.1a, 8.1b, 8.1c and 8.2.
8.3.2
An estimate of the maximum material
volumes involved during construction and potential for re-use of excavated
material is shown in Tables 8.1a and 8.1c. The method and the programme of
the disposal of the C&D materials are shown in Table 8.1b.
Breakdown of Surplus Material Types and Volumes Likely to
Arise during Construction of KT13
|
Location |
Inert Excavated Material
(not contaminated) including Rock (Grade |
Sediments (m3) |
C&D Waste (m3) |
|
KT13 Section A |
26,540 |
8,218 |
44 |
|
KT13 Bypass Culvert |
17,690 |
800 |
45 |
|
KT13 Section B |
21,500 |
5,421 |
35 |
|
Total |
65,730 |
14,439 |
124 |
Method and Programme of the Disposal of Construction and
Demolition Materials (m3)
|
|
KT13 Section A (CH0 – CH401) |
KT13 Bypass Culvert (CH0 – CH400) |
KT13 Section B (CH0 – CH301) |
|
2007 |
|
|
|
|
Reuse on site |
957 |
652 |
774 |
|
Reuse at other projects or to public filling facilities |
4,624 |
3,149 |
3,741 |
|
Disposal to East Sha Chau facility |
2,876 |
800 |
1,897 |
|
Disposal to NENT landfill |
10 |
10 |
7 |
|
Imported fill |
142 |
97 |
116 |
|
2008 |
|
|
|
|
Reuse on site |
1,149 |
783 |
929 |
|
Reuse at other projects or to public filling facilities |
9,522 |
6,292 |
7,718 |
|
Disposal to East Sha Chau facility |
3,287 |
0 |
2,168 |
|
Disposal to NENT landfill |
17 |
18 |
14 |
|
Imported fill |
171 |
116 |
138 |
|
2009 |
|
|
|
|
Reuse on site |
766 |
522 |
620 |
|
Reuse at other projects or to public filling facilities |
9,522 |
6,292 |
7,718 |
|
Disposal to East Sha Chau facility |
2,055 |
0 |
1,356 |
|
Disposal to NENT landfill |
17 |
17 |
14 |
|
Imported fill |
114 |
77 |
19 |
Remarks :
1. The exact programme and quantities of the
disposal and filling works will depend on the contractor’s programme after the
contract is awarded.
2. C&D materials should be disposed of at designated public filling facilities or landfills. Disposal of the materials for use at other construction projects is subject to the approval of the Engineer and/or relevant authorities, such as LandsD, PlanD, etc. Furthermore, unauthorized disposal of C&D materials in particular on private agricultural land is prohibited and may be subject to relevant enforcement and regulating actions. The Contractor shall refer and strictly follow the requirements stipulated in the ETWB TCW No. 31/2004 - Trip Ticket System for Disposal of Construction & Demolition Materials.
Summary of Estimated Quantity
of Construction and Demolition Materials (m3) Arising from this
Designated Project
|
|
KT13 |
KT13 |
KT13 |
Total |
|
C&DM to be reused on site |
2,872 |
1,957 |
2,323 |
7,152 |
|
C&DM to be reused on other projects or delivered to public filling facilities |
23,668 |
15,733 |
19,177 |
58,578 |
|
Sediments for marine disposal |
8,218 |
800 |
5,421 |
14,439 |
|
C&D waste to be disposed of at NENT landfill |
44 |
45 |
35 |
124 |
|
Total |
34,802 |
18,535 |
26,956 |
80,293 |
Remark:
1. The exact programme and
quantities of the disposal and filling works will depend on the contractor’s
programme after the contract is awarded.
2. C&D materials should be disposed of at designated public filling facilities or landfills. Disposal of the materials for use at other construction projects is subject to the approval of the Engineer and/or relevant authorities, such as LandsD, PlanD, etc. Furthermore, unauthorized disposal of C&D materials in particular on private agricultural land is prohibited and may be subject to relevant enforcement and regulating actions. The Contractor shall refer and strictly follow the requirements stipulated in the ETWB TCW No. 31/2004 - Trip Ticket System for Disposal of Construction & Demolition Materials.
8.3.3
It
is estimated that the quantity of C&D material to be transported off site
is 73,141m³. The amount of fill need to be imported is 990m³. The amount of
material reused on site is 7,152m³. Amount of material required to be reused at
other public works project (subject to approval by relevant authorities as
stipulated in ETWB TCW No. 31/2004) or disposed of to designated public filling
facilities amounts to 58,578m³. Worst case estimate of sediments quantity is 14,439m³. Approximately 12,062m³ and 2,377m³ of
sediment will require Type 1 – open sea disposal and Type 2 – confined marine
disposal respectively. Amount of C&D waste to be disposed to landfill is 124m³.
The designated landfill to accept C&D waste generated from this Project
will be the NENT Landfill. The designated public filling facility to dispose
the public fill generated from this Project will be the Public Filling Facility
at Tuen Mun Area 38. The locations
of disposal of the sediment were obtained from the Marine Fill Committee. Type 1 – open sea disposal will be Pit
IVa / Pit IVb of the East Sha Chau facility as capping material while for Type
2 – confined marine disposal will be Pit IVc of the East Sha Chau facility.
8.3.4
C&D
materials should be disposed of at designated public filling facilities or
landfills. Disposal of the materials for use at other construction projects is
subject to the approval of the Engineer and/or relevant authorities, such as
LandsD, PlanD, etc. Furthermore, unauthorized disposal of C&D materials in
particular on private agricultural land is prohibited and may be subject to
relevant enforcement and regulating actions. The Contractor shall refer and
strictly follow the requirements stipulated in the ETWB TCW No. 31/2004 - Trip
Ticket System for Disposal of Construction & Demolition Materials.
Construction Wastes Generated by the Proposed Works
|
Area |
Major Activities |
Waste Type |
|
All |
Site clearance |
Vegetation Topsoil |
|
All |
Demolition |
Concrete Bricks/Tiles Scrap Metals Wooden material and other non-inert waste |
|
All |
Excavation |
Fill Material (Assorted spoil from previous civil projects nearby. Contains rocks of various size and soil, debris of pipes and other inert rubbish such as plastic. Not suitable for re‑use on site or other projects.) Clean sediments Contaminated sediments |
|
All |
General site Activities |
Sewage Municipal Wastes Packaging Materials Chemical Waste (including waste oil, lubricants, paints and solvents) |
8.4
Responsibilities
for Construction Waste Management
8.4.1
When handling the waste material
the Contractor shall follow and comply with the following legislation and
guidelines:
(i)
The Contractor shall be aware of,
and comply with, the Waste Disposal
Ordinance, the Public Health and
Municipal Services Ordinances, the Water
Pollution Control Ordinance and the Waste
Disposal (Chemical Waste) (General Regulation).
(ii)
The Contractor's attention is drawn
to A Guide to the Chemical Waste Control
Scheme; A Guide to the Registration of
Chemical Waste Producers; and the Code
of Practice on the Packing, Labelling and Storage of Chemical Wastes.
(iii)
The Contractor shall comply with
and complete the procedures in the following Works Branch Technical Circulars
(WBTC) and Environment, Transport and Works Bureau Technical Circulars (Works)
(ETWB TCW):
• WBTC
No. 2/93 – Public Dumps
• WBTC
No. 2/93B – Public Filling Facilities
• WBTC
No. 16/96 – Wet Soil in Public Dumps
• WBTC
No. 4/98) Use of Public Fill in Reclamation
4/98A)
and Earth Filling Projects
• WBTC
No. 25/99) Incorporation of Information on
25/99A)
Construction and Demolition
25/99C)
Material Management in PWSC Papers
• WBTC
No. 12/2000 – Fill Management
• WBTC
No. 19/2001 Metallic Site Hoardings and Signboard.
• WBTC No.
12/2002 – Specification Facilitating the Use of Recycled Aggregates
• ETWB
No. 33/2002 - Management of Construction and Demolition Material including
Rock.
• ETWB
TCW No. 34/2002 – Management of Dredged/Excavated Sediment.
• ETWB
TCW No. 31/2004 – Trip-ticket System for Disposal of Construction and
Demolition Material
• ETWB
TCW No. 19/2005 – Environmental Management on Construction Sites.
8.4.2
Appropriate
waste management measures should be incorporated as part of the Environmental
Management Plan (EMP) to be prepared and implemented by the Contractor and to be
submitted to the Engineer for approval. This EMP shall include all factors
dependent on individual works sites including designation of areas for the
segregation and temporary storage of materials for future use or recycling. Contractors
shall follow the recommendations of ETWB TCW No. 19/2005 for environmental
management on construction site. In particular, a trip ticket system in
accordance with ETWB TCW No. 31/2004 shall be incorporated to control
fly-tipping and monitor the disposal of C&D and solid wastes at public
filling facilities and landfills. Also the EMP shall include a recording system
for the amount of wastes generated, recycled and disposed, as well as the
identities of the disposal sites. The Contractor shall refer to the
Construction and Demolition Material Management Plan (C&D MMP) in
Appendix K.
8.4.3
Training of construction staff
should be undertaken by the Contractor in order to increase awareness of waste
management issues. Requirements for staff training should be included in the
Contractor’s site Environmental Management Plan.
8.4.4
The
Public Fill Committee (PFC), review and co-ordinate the provision and operation
of land based public filling facilities, whilst the Marine Fill Committee (MFC)
co-ordinates marine based facilities. Responsibilities for recycling, re-use or
disposal of waste materials will be the Contractors generating the waste. These
responsibilities are described below and summarised in Table 8.4. All site
activities shall be in line with the recommendations of ETWB TCW No. 19/2005.
8.4.5
The
appendices and requirement of the ETWB TCW No. 19/2005 shall form part of the
construction contract specification and shall be followed when preparing the
outline Environmental Management Plan.
8.4.6
The
Contractor is responsible for re-use, recycle and dispose the construction
waste according to the methods detailed in Table 8.3. A summary of the
responsibilities of the Contractor is provided in Table 8.4.
Potential for Recycling and Reuse and Disposal Options for
Different Construction Waste Type
|
Waste Type |
Works Generating Waste |
Volumes Lost as Waste |
Potential Re-Use or
Recycling |
Destinations |
|
Inert Fill Material and Topsoil/Pond Material |
Excavation works |
None |
Excess fill material produced during construction can be re-used. |
Fill material to be reused on or off-site by Contractor. Excess fill to be sent to C & D Material Recycling Plant at Tuen Mun Area 38 or approved Public Filling areas. |
|
Stream bed material and material from previously filled ponds |
Excavation along channel and along construction spoil in ponds filled by other nearby civil projects |
Amount Significant (approximate 50%) |
Dried and reusable if clean or considered of an engineering suitable grade. Otherwise to be disposed. Pond bottom deposits not likely to be suitable engineering material. Rubble filled material from previously in-filled ponds will have to be checked to see if it is of a grade suitable for re-use. |
Clean deposits and spoil should be sorted and reused within works. Any excess shall be sent to C & D Material Recycling Plant at Tuen Mun Area 38 or to approved Public filling areas. |
|
Concrete |
Demolition of current channel sides; Construction of channel |
3 - 5% |
Needs to be separated; re-useable material needs to be crushed. |
To C & D Material Recycling Plant at Tuen Mun Area 38. |
|
Wooden Material |
Construction Demolition |
20% |
Reusable as lower grade shuttering or fencing on-site or other sites. |
To NENT Landfill (final disposal). |
|
Scrap metals |
Construction Demolition |
Small amounts |
Cannot be reused on site. It will be sold to recycling company. |
To NENT Landfill only if rejected by recycling companies. |
|
Stream sediments |
Excavation |
100% |
None |
Uncontaminated sediment to East Cha Chau facility as capping material. Contaminated sediment to East Sha Chau facility. |
|
Chemical Waste (including waste oil, lubricants, paints and solvents) |
General Construction site activities/Cleaning and maintenance of site equipment/ grease traps |
Small amounts |
Waste oil may be collected by oil companies. For other types of chemical wastes, the recycling potential is low. |
To be collected by licensed collectors for disposal at the Tsing Yi Chemical Waste Treatment Facility or other licensed facilities. |
|
|
Vehicle use during general works |
Total volume when replaced |
Settled at sedimentation ponds and recycled. |
Settled sediments to be dried and disposed at public filling areas or C&D Material Recycling Plant. |
|
Sewage |
Where site workers are present |
Small |
None. |
Chemical toilet waste to be disposed to government sewer by licensed contractor. |
|
Municipal/ Domestic Waste |
General site activities |
Putrescible waste, wet paper, fabrics |
Aluminium cans, dry paper, and clean plastic containers (not used to contain hazardous chemicals) |
To NENT Landfill after extracting recyclable items from waste stream. |
Responsibilities for Waste
Collection, Recycling and
Disposal during the Construction Phase
|
Waste Type |
Responsibility for
Collection of Waste |
Responsibility for
Transport of Waste Off-Site |
Responsibility for
Recycling |
Responsibility for
Disposal |
|
Excavated Material |
Contractor |
Contractor |
Contractor, for the portion of fill re-used on site. For surplus fill, CEDD (Port Works) defines sites that require fill. |
Contractor |
|
Concrete |
Contractor |
Contractor |
CEDD (Port Works) defines sites which require fill. |
Contractor |
|
Wooden Material |
Contractor |
Contractor |
Contractor |
Contractor |
|
Scrap Metals |
Contractor |
Contractor |
Contractor |
Contractor |
|
Municipal / domestic waste |
Contractor to arrange licensed contractors |
Licensed contractors |
Not applicable |
Contractor |
|
|
Contractor |
Contractor (settled material) |
Contractor |
Contractor |
|
Sewage |
Contractor to arrange licensed contractors |
Licensed contractors |
Not applicable |
Licensed contractors to sewage treatment works operated by DSD |
|
Sediments |
Contractor |
Contractor |
Not applicable |
Contractor to location approved by Marine Fill Committees (MFC). |
|
Chemical Waste (including waste oil, lubricants, paints and solvents) |
Contractor to arrange licensed collectors |
Licensed collectors |
Not applicable |
Licensed collectors of chemical wastes to Chemical Waste Treatment Facility at Tsing Yi or other licensed facilities |
8.4.7
In
particular, the Contractor shall be required to:
i)
All excavated materials should be sorted to recover the inert
portions (e.g. soil and broken rock) for reuse on site or disposal to
designated outlets (e.g. public filling areas):
ii)
All metal should be recovered for collection by recycling
contractors;
iii)
All cardboard and paper packaging (for plant, equipment and
materials) should be recovered, properly stockpiled in dry and covered
condition to prevent cross contamination by other C&D materials; and
iv)
All demolition debris from demolition works should be sorted
to recover broken concrete, reinforcement bars, mechanical and electrical
fittings as well as other building services fittings / materials that have
established recycling outlets.
8.4.8
Contractors
are required to carry out on-site sorting of C&D materials to recover the
inert portion, and those reusable and/or recyclable materials. The contractors
should include a system of work in his EMP to set out the proposed arrangement
for on-site sorting and temporary storage of C&D materials. Where the
contract involves demolition works, the contractor is required to prepare a
method statement to facilitate effective recovery of reusable/recyclable
C&D materials at an early stage, so as to minimize the need for subsequent
sorting. He should submit the method statement to the Architect/Engineer for
approval prior to commencement of the demolition.
8.4.9
The Contractor shall comply with
the trip-ticket system for the disposal of C&D materials as outlined in ETWB
TCW No. 31/2004 - Trip‑ticket System for Disposal of Construction and
Demolition Material.
8.4.10
The Contractor will be required to
complete the relevant details on a standard form and submit them for stamping
and collection by site supervisory staff and submit to the Engineer the receipt
issued by the operator of the public filling facility/landfill after the disposal
of the C&D materials. Details to be included in the standard form and the
receipt are included in ETWB TCW No. 31/2004.
8.5.1
Waste
will inevitably be produced during the construction phase of KT13. Waste types,
quantities and timing have been estimated as far as possible and mitigation
measures evaluated in terms of the avoidance-minimization-recycling-disposal
hierarchy. This will minimize the disposal requirement and to conserve void
space at landfill sites.
8.5.2
Construction phase wastes will
include site clearance and demolition material, excavated materials,
contaminated sediments, waste concrete, wooden material, chemical waste,
aqueous waste, wheel wash waste, sewage, and municipal/domestic waste. The
potential for re-use and re-cycling has been discussed and appropriate pathways
for disposal have been identified. The responsibilities for recycling and
disposal have also been identified.
8.5.3
The quantity of operation waste
arising from the project is limited. The material is reusable under other construction
projects or to public fill areas after de-watering.
8.5.4
Provided that all the requirements
listed in the EIA are met, construction waste will be minimized and potential
pollution from construction waste prevented.
REFFERENCES
EPD
(1999) Monitoring of Solid Waste in