TABLE OF CONTENTS
6 Waste Management Implications.
6-1
6.1
Introduction. 6-1
6.2
Environmental Legislation, Standards and Guidelines. 6-1
6.3
Assessment
Methodology. 6-5
6.4
Identification and Evaluation of Wastes Implications. 6-5
6.5 Mitigation of
Adverse Environmental Impacts. 6-14
6.6
Evaluation of Residual Impacts.
6-23
6.7
Environmental Monitoring and Audit Requirements. 6-23
6.8
Conclusion. 6-23
List of tables
Table 6.1
Summary of Estimated Quantities of C&D Materials Generated during
Construction Phase. 6-6
Table 6.2 Original and Revised
Sampling Location IDs for the Assessment 6-11
Table 6.3 Summary of Chemical
Screening Results. 6-12
Table 6.4 Summary of Biological
Screening Results. 6-12
Table 6.5 Estimated Quantities
of Sediment under each Disposal Option 6-13
Table 6.6 Summary of Estimated
Waste Arising and Recommended Disposal 6-20
LIST OF FIGURES
|
Figure 6.1
|
Proposed and As-built Sediment Sampling
Locations
|
LIST OF
appendiCES
|
Appendix
6.1
|
Sediment Sampling and Testing Plan (SSTP)
|
|
Appendix
6.2
|
Summary of Chemical Screening Results and
Disposal Options
|
|
Appendix
6.3
|
Summary of Biological Screening Results
|
|
Appendix
6.4
|
Laboratory Analytical Report (Chemical
Screening)
|
|
Appendix
6.5
|
Laboratory Analytical Report (Biological
Screening)
|
|
Appendix
6.6
|
Details of Sediment Quantity Estimation
|
6
Waste Management Implications
6.1
Introduction
6.1.1
This section identifies the types of wastes that are
likely to be generated during the construction and operation phases of the Project, and evaluates the potential environmental impacts
that may result from handling, transport and disposal of these wastes. The
criteria and guidelines for assessing waste management implications are
outlined in Annex 7 and 15 of the Technical Memorandum on Environmental
Impact Assessment Process (EIAO-TM). The
waste management implications have been assessed in accordance with the
requirements outlined in Annex 7 and Annex 15 of the EIAO-TM as well as the
requirements set out under Clause 3.4.6 of the EIA Study Brief (No.
ESB-357/2022).
6.1.2
The assessment has taken into consideration the latest
project layout, including the proposed breakwaters alignments with marine
access in the form of landing facilities, the proposed land access and proposed
wave wall in the form of floating breakwater, as discussed in Section 2
and as shown in Figure 2.1.
6.1.3
Mitigation measures and good site practices, including
waste handling, storage, collection and disposal, have been recommended with
reference to the applicable waste legislation and guidelines.
6.2
Environmental
Legislation, Standards and Guidelines
6.2.1
The criteria and guidelines for assessing waste
management implications are outlined in Annex 7 and 15 of the EIAO-TM.
6.2.2
The following legislation, which has been used in
assessing potential impacts, relates to the handling, treatment and disposal of
wastes in the Hong Kong SAR:
· 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);
· Public Health and Municipal Services Ordinance
(Cap.132) - Public Cleansing and Prevention of Nuisances Regulation; and
· Dumping at Sea Ordinance (Cap. 466).
Waste
Disposal Ordinance
6.2.3
The Waste Disposal Ordinance (WDO) (Cap. 354) prohibits the unauthorised disposal of wastes. Construction waste,
defined under Cap. 354N of the WDO means any substance, matter or thing that is
generated from construction works and abandoned, whether or
not it has been processed or stockpiled before being abandoned, but does
not include any sludge, screenings or matter removed in or generated from any
desludging, desilting or dredging works. Under WDO, waste should be
disposed of at designated waste disposal facilities licensed by the
Environmental Protection Department (EPD).
Waste
Disposal (Chemical Waste) (General) Regulation
6.2.4
Under the WDO, the Chemical Waste (General)
Regulation (Cap. 354C) provides regulations for chemical waste control, and
administers the possession, storage, collection, transport and disposal of
chemical wastes. EPD has also issued three statutory guidelines: A
Guide to the Chemical Waste Control Scheme (2016) to introduce and explain
the legislative controls over the management of chemical waste in Hong Kong; A
Guide to the Registration of Chemical Waste Producers (2016) to introduce the
registration provisions of the Waste Disposal (Chemical Waste) (General)
Regulation (the Regulation) and the procedure for identifying chemical waste
generation; and the Code of Practice on the Packaging, Labelling and Storage
of Chemical Wastes (1992), which details how the chemical waste producers
should comply with the regulations on chemical waste.
Waste
Disposal (Charges for Disposal of Construction Waste) Regulation
6.2.5
Under the Waste Disposal (Charges for Disposal of
Construction Waste) Regulation (Cap.354N), construction waste
delivered to a landfill for disposal must not contain more than 50% by weight
of inert material. Construction waste delivered to a sorting facility for
disposal must contain more than 50% by weight of inert material, and construction
waste delivered to a Public Fill Reception Facility (PFRF) for disposal must
consist entirely of inert material.
Land (Miscellaneous Provisions) Ordinance
6.2.6
The inert portion of construction and demolition
(C&D) materials (including rocks, soil, broken concrete, building debris,
etc.) may be taken to PFRFs. PFRFs 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 public fill to the PFRFs
are required to obtain Dumping Licences. The licences are issued by CEDD under
delegated authority from the Director of Lands.
6.2.7
Individual licences and windscreen stickers are issued
for each vehicle involved. Under the licence conditions, PFRFs will only
accept soil, sand, rubble, brick, tile, rock, boulder, concrete, asphalt,
masonry or used bentonite. In addition, in accordance with paragraph 12 of the
Development Bureau (DevB) Technical Circular
(Works) TC(W) No.6/2010, Public Fill Committee (PFC) will advise on the
acceptance criteria. 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
6.2.8
The Public Cleansing and Prevention of Nuisances
Regulation (Cap. 132) under the Public Health and Municipal Services
Ordinance provides control on dumping of litter in public places.
Dumping
at Sea Ordinance
6.2.9
The Dumping at Sea Ordinance (DASO) came into
operation in April 1995 and empowers the Director of Environmental Protection
(DEP) to control the disposal and incineration of substances and particles at
sea for the protection of the marine environment. Under the Ordinance, a
dumping permit from the DEP is required for the disposal of regulated
substances within and outside the waters of Hong Kong. The permit
contains terms and conditions which include the following specifications, but
not limited to:
· Type and quantity of substances permitted to be dumped;
· Location of the disposal grounds;
· Requirement of equipment for monitoring the disposal
operations; and
· Environmental monitoring requirements.
6.2.10
Marine disposal of any dredged/excavated sediment is
subject to control under the DASO. Dredged/excavated sediment destined
for marine disposal is classified based on its contaminant levels with
reference to paragraph 4.2.1 of Chapter 4 of the Project Administration
Handbook for Civil Engineering Works (PAH) (subsumed from the Environment, Transport and Works Bureau Technical Circular (Works) No.
34/2002 Management of Dredged/Excavated Sediment (ETWB
TCW No. 34/2002)). The PAH and ETWB TCW No. 34/2002 stipulated
sediment quality criteria or Chemical Exceedance Levels (CEL) for contaminants
including metals, metalloid and organic pollutants.
6.2.11
Considering that the sediment related assessment under
the EIA study, including EPDs approval of the Sediment Sampling and Testing
Plan (SSTP), and chemical and biological tests, were conducted from 2022 to
early 2023 in accordance with the ETWB TCW No. 34/2002 (i.e. prior to
the update of PAH), this report was prepared in accordance with the requirement
stipulated in ETWB TCW No. 34/2002.
Environmental
Guidelines
6.2.12
Environmental guidelines that are related to waste
management practices for the Project include:
· Works Branch Technical Circular (WBTC) No. 2/93,
Public Dumps;
· WBTC No. 2/93B, Public Filling Facilities;
· WBTC No. 12/2000 Fill Management;
· DevB TC(W) No.
6/2010, Trip-ticket System for Disposal of Construction and Demolition Materials;
· Section 4.1.3 of Chapter 4 of the Project
Administration Handbook for Civil Engineering Works (PAH), Management of
Construction/Demolition Materials including Rocks;
· CEDD TC No. 11/2019 Management of Construction and
Demolition Materials.
· ETWB TCW No. 19/2005 Environmental Management on
Construction Sites;
· ETWB TCW No. 34/2002 Management of Dredged/Excavated Sediment;
· DEVB TCW No. 08/2010 Enhanced Specification for Site
Cleanliness and Tidiness;
· DEVB TCW No. 09/2011 Enhanced Control measures for
Management of Public Fill;
· Code of Practice on the Packaging, Labelling and
Storage of Chemical Wastes (1992), EPD;
· A Guide to the Chemical Waste Control Scheme (EPD).
6.2.13
The WBTC No. 2/93, Public Dumps documents the
current policy related to the disposal of C&D materials. C&D materials
that are wholly inert, i.e. public fill, should be taken to PFRFs for reuse
instead of being disposed of at landfill.
6.2.14
In accordance with the DevB
TCW No. 6/2010 Trip Ticket System for Disposal of Construction and
Demolition Materials, for all contracts that are expected to generate
inert C&D materials (e.g. soil, broken rock, broken concrete and building
debris, etc.) requiring disposal from site, the project office shall write to
the PFC through Secretary of the PFC to request a designated disposal ground
for incorporation into the tender documents. For contracts where the
estimated amount of non-inert C&D materials requiring disposal at landfill
facilities equals or exceeds 50 m3, the project office shall seek
confirmation from the DEP in terms of the availability of landfill facilities
for disposal of such materials. The DEP will designate landfill
facilities, if available, for the contract. Where the estimated amount of
non-inert C&D materials to be generated from the contract is less than 50 m3,
the project office is not required to apply to DEP for designated landfill
facilities. However, the project office should still specify in the
tender documents of the appropriate landfill facilities for disposal.
6.2.15
Further measures have been introduced under Paragraph
4.1.3 of Chapter 4 of the PAH to enhance the management of C&D materials,
and to minimise its generation at source. The enhancement measures include:
· Drawing up a Construction and Demolition Materials
Management Plan (C&DMMP) at an early design stage to minimise C&D
materials generation and to encourage proper management of such materials;
· Vetting of the C&DMMP prior to upgrading of the
project to Category A in the Public Works Programme; and
· Providing the contractor with information from the
C&DMMP in order to facilitate the preparation of
Waste Management Plan (WMP) and to minimise C&D materials generation during
construction.
6.2.16
The ETWB TCW No. 19/2005 Environmental Management
on Construction Sites introduces additional measures to enhance waste
management on construction sites. The circular sets out the policies and
procedures that require the contractors to prepare and implement an
Environmental Management Plan (EMP), which includes the WMP to encourage
on-site sorting of C&D materials and to minimise generation of C&D
materials during the course of construction.
6.2.17
The PAH and ETWB TCW No. 34/2002 sets out the procedure for seeking
approval to and the management framework for marine disposal of
dredged/excavated sediment. The guideline / circular outline the
requirements to be followed in assessing and classifying the sediment and
explains the marine disposal arrangement for the classified material. The
sediment quality criteria for the classification of sediment were referred as
the Lower Chemical Exceedance Level (LCEL) and Upper Chemical Exceedance Level
(UCEL). The LCEL and UCEL are presented in Appendix 4.28 of PAH and Appendix A
of ETWB TCW No. 34/2002. Subject to the results of the chemical
screening, biological screening may be required to determine the disposal
requirement of the sediment. There are three types of disposal options
for dredged / excavated sediments stipulated in the relevant guidelines:
· Type 1 Open Sea Disposal or Open Sea Disposal in
Dedicated Sites;
· Type 2 Confined Marine Disposal; and
· Type 3 Special Treatment / Disposal. For Type
3 disposal, the project proponent shall be responsible for identifying and
agreeing with the DEP the most appropriate treatment and/or disposal
arrangement.
6.3
Assessment Methodology
6.3.1
The assessment of waste management implications
arising from the construction and operation phases of the Project has been
undertaken in accordance with Appendix E of the EIA Study Brief (No.
ESB-357/2022) and criteria given in Annexes 7 and 15 of the EIAO-TM, and
includes the following tasks:
· Identification and estimation of the types,
quantities, qualities and timing of the wastes generated;
· Evaluation of opportunities for waste reduction,
re-use and recycling;
· Identification of disposal options for each type of wastes;
· Assessment of potential environmental impacts arising
from the waste management with respect of potential hazards, air and odour
emissions, noise, wastewater discharges and public transport; and
· Assessment of impacts caused by handling, collection,
transportation and re-use / disposal of wastes.
6.4
Identification
and Evaluation of Wastes
Implications
Construction
Phase
6.4.1
The construction works are anticipated to be carried
out between 2026 and 2030. The major works items for the Project are
discussed in Section 2 and includes the following:
(i)
Proposed eastern breakwater, approximately 340 metre (m) in
length, pointing to southwest with about 50 m tip bending southward, with open
space and proposed marine access in form of public landing facilities (i.e.
landing steps / ramp) and associated seabed stabilisation works;
(ii) Proposed western breakwater, approximately 300
m in length, pointing to northeast with about 85 m tip bending northward, with
landing facilities for maintenance purpose and associated seabed stabilisation works;
(iii) Proposed land access, approximately 240 m in length, connecting the
proposed eastern breakwater to Tai Shue Wan waterfront along the rocky
shoreline within the Project boundary;
(iv) Proposed wave wall in the form of floating breakwater of about 110 m in
length in the sea area within the Aberdeen Typhoon Shelter (ATS) expansion area
at a location approximately 70 m eastward of the tombolo between Yuk Kwai Shan
and Ap Lei Pai;
(v) Modification of the crest of existing eastern
breakwater to form a new open space with
pedestrian access to Shum Wan Road; and
(vi) Modification of the existing western breakwaters, which includes
shortening of the breakwater by approximately 70 m with a view to straightening
the navigation channel.
6.4.2
The following waste types are anticipated to be
generated during the construction phase of the Project:
· C&D materials;
· Chemical wastes;
· Floating refuse;
· General refuse; and
· Dredged sediments.
Construction
and Demolition Materials
6.4.3
C&D materials would be generated mainly from
general construction works and shortening of the existing breakwater. The
C&D materials would both comprise inert C&D materials (e.g. soil, rock
and concrete, etc.) and non-inert C&D materials (e.g. vegetation, papers,
plastics, packaging materials etc.).
Based on the latest design information, it is estimated that a total of
approximately 25,000 m3 of C&D materials would be generated
during construction phase of the Project. A summary of the C&D
materials estimates during construction phase is shown in Table 6.1.
Table 6.1
Summary of Estimated Quantities of C&D Materials Generated during
Construction Phase
|
Inert C&D Materials (m3)
|
Non-inert C&D Materials (m3)*
|
Total C&D Materials (m3)
|
|
Inert C&D Materials to be Reused On Site
|
Inert C&D Materials to be Beneficially Reused in Other Projects
|
|
22,400
|
1,600
|
1,000
|
25,000
|
Note:
*
The non-inert C&D materials would be reused and recycled before disposal of
at landfill.
6.4.4
The inert C&D materials should be reused on-site
to minimise the net amount of inert C&D materials generated from the
Project. It is estimated that approximately 22,400 m³ of inert
C&D materials (mainly soil) could be reused on-site as backfill materials
whilst approximately 1,600 m³ of surplus inert C&D materials would be
delivered to PFRF for beneficial reuse in other projects. It is proposed
to deliver the surplus inert C&D materials to Tuen Mun Area 38 Fill Bank
for beneficial reuse in other projects by marine transport via East Lamma Channel, Western
Fairway, Ma Wan Fairway, Ha Pang Fairway, Castle Peak Fairway and Urmston Road
Fairway. As there will be two work fronts with one barge
working at each work front, it is assumed that a maximum of about 2 barge trips
per day will be sufficient to deliver these materials to PFRF during
construction phase.
6.4.5
An estimated 1,000 m³ of non-inert C&D materials
will be generated during construction and will be reused or recycled whenever
possible. Remaining non-inert C&D materials will be disposed of at the West
New Territories (WENT) Landfill. A maximum of one barge trip and/or one truck
trip per day
provides sufficient capacity for the anticipated disposal needs. The barge
route runs from ATS to Rambler Channel Typhoon Shelter, with onward transport
by truck via Kwai Yue Street, Kwai Tai Road, Kwai Tsing Road, Tsuen Wan Road,
New Territories Circular Road, Lung Mun Road, Lung Kwu
Tan Road and Nim Wan Road. Alternatively, the truck route runs directly from
ATS via Shum Wan Road, Nam Long Shan Road, Wong Chuk Hang Road, Route 1, Route
3, Tuen Mun Road, Lung Mun Road, Lung Kwu Tan Road
and Nim Wan Road.
6.4.6
The waste collection frequency and transportation
routes would be reviewed and subject to the actual operation of the
construction activities. Land and marine transport should be used to
deliver and dispose of the waste generated from the Project to the designated
disposal outlets. No barging points, conveyor systems nor stockpiling
areas would be established in the Project site.
6.4.7
It is the Contractors responsibility to separate the
inert and non-inert C&D materials on-site. The non-inert C&D
materials would be disposed of at strategic landfill by barge and/or truck and
surplus inert C&D materials will be transported to the PFRF by
barges. A C&DMMP would be prepared in accordance with Section 4.1.3
of the PAH and submitted to PFC for approval in the detail design stage.
With the implementation of proper management for C&D materials and good site
practices, no unacceptable environmental impacts (including potential hazard,
air and odour emissions, noise and wastewater discharges) and public transport
impact due to handling and disposal of C&D materials arising from the
Project would be anticipated.
Chemical
Waste
6.4.8
The maintenance and servicing of construction plants,
equipment and machineries would generate a negligibly small amount
of chemical wastes, for instance, oil / grease, cleaning fluids, solvents,
lubrication oil and fuel, used oil filter and scrap batteries. Since the construction
activities would be carried out in the Aberdeen Channel, chemical wastes arising during the construction phase may pose
environmental, health and safety hazards if not stored and disposed of in an
appropriate manner as stipulated in the Waste Disposal (Chemical Waste)
(General) Regulations (Cap. 354C).
6.4.9
It is difficult to quantify the amount of chemical
waste that would arise from the construction activities as it would be highly
dependent on the Contractors on-site maintenance activities and the quantity
of plant and equipment utilised. However, it is anticipated that the
quantity of chemical waste would be in the order of a few cubic metres per
month. The amount of chemical waste to be generated would be quantified
in the WMP to be prepared by the Contractors.
6.4.10
Materials
classified as chemical waste shall require special handling and storage
arrangements by the Contractor. Unused chemical or those with remaining
functional capacity would be reused and recycled on site or by licensed
companies whenever possible. Remaining chemical waste shall be collected
by a licensed collector and be disposed at a licensed chemical waste treatment
and disposal facility such as Chemical Waste Treatment Centre (CWTC) at Tsing
Yi. A maximum of one barge trip and/or one
truck trip per day provides sufficient capacity for the anticipated disposal
needs. The barge route runs from ATS to Rambler Channel Typhoon Shelter, with
onward transport by truck via Kwai Yue Street, Kwai Tai Road, Kwai Tsing Road
and Tsing Yi Road. Alternatively, the truck route runs directly from ATS via
Shum Wan Road, Nam Long Shan Road, Wong Chuk Hang Road, Route 1, Route 3, Kwai
Tsing Road and Tsing
Yi Road. Mitigation and control requirements
for chemical wastes are detailed in Section 6.5.9. Provided that the
handling, storage and disposal of chemical wastes are in accordance with these
requirements and the Code of Practice on Packaging, Labelling and Storage of
Chemical Wastes published by EPD, adverse environmental impacts (including
potential hazard, air and odour emissions, noise, wastewater discharge and
ecology) and public transport impact will be negligible.
Floating
Refuse
6.4.11
Floating refuse (i.e. food scraps, plastics, waste paper and empty containers etc.) may be generated by
the construction workforce while working on/near the sea. Additionally,
accidental losses of construction materials and wastes when transporting to and
from the designated sites might occur. Nevertheless, with proper waste
management and training, floating refuse generated from the Project under these
events is not expected.
6.4.12
On the other hand, floating refuse not generated from
the Project may wash up onto the Project area through the effect of wind and currents, and may be trapped and accumulated along the
shoreline and breakwaters, especially in summer months following heavy rains
and typhoons. As advised by Marine Department (MD), there was no
available record of floating refuse collected within the Aberdeen Channel and
based on the current condition of the existing breakwaters and shoreline within
the Project area, the floating refuse to be trapped is expected to be limited.
Moreover, the proposed wave wall has been designed as
a form of floating breakwater which minimise the effect to the water flow and
thus the floating refuse accumulation. With reference to the approved EIA
Report for Expansion of Hong Kong International Airport into a Three-Runway
System (Register No.: AEIAR-185/2014)
and Tung Chung New Town Extension (Register No.: AEIAR-196/2016), it is estimated that 11.5 m3 of
floating refuse would be collected from the 3.4 km long artificial seawall
during each year of construction. Considering the total length of the newly constructed
breakwaters and wave wall in the form of floating breakwater is approximately 1.3 km, it is anticipated that about 4.4 m3
of floating refuse could be collected during each year of construction as a
conservative estimate.
6.4.13
During the construction phase, the Contractor will be
responsible for the collection of any refuse within the works area. In
case of floating refuse is identified, the floating refuse shall be removed, and stored and dispose of together with the general
refuse, after separating the recyclables for recycling. The
transportation routing and frequency of the barges / trucks involved for
disposal of general refuse is provided in Section 6.4.15. With
implementation of proper refuse collection practice and the mitigation measures
as detailed in Section 6.5.10 - 6.5.11, no adverse
environmental impact with regard to floating refuse
would be anticipated during construction phase, or after completion of the
Project.
General
Refuse
6.4.14
General refuse comprising food waste, plastic bottles,
aluminium cans, waste papers etc. would be generated by the workforce during
the construction period. The maximum number of construction workers to be
working on site at any one time was estimated to be about 400. Based on a
generation rate of 0.65 kg per worker per day, the daily arising of general
refuse during the construction period would be about 260 kg. Therefore, it is estimated that around 960 m3 of general
refuse would be generated during the
construction phase. Recyclable materials such as paper, plastic bottles and
aluminium cans will be separated for recycling in order to
reduce the quantity of general refuse to be disposed of at landfill. It is expected that the remaining non-recyclable general refuse from construction sites would be disposed of
at WENT Landfill.
6.4.15
The
general refuse will be generated during construction and will be collected
on-site on a daily basis, separately from C&D
materials by an appropriate waste collector to be employed by the Contractor.
Prior to disposal off-site, such refuse will be temporarily put in suitably
covered storage areas / bins where they will have to be regularly cleaned and
maintained to avoid attracting vermin and pests. The general refuse would be
disposed of at WENT Landfill. A maximum of one barge trip and/or
one truck trip per day provides sufficient capacity for the anticipated
disposal needs. The barge route runs from ATS to Rambler Channel Typhoon
Shelter, with onward transport by truck via Kwai Yue Street, Kwai Tai Road,
Kwai Tsing Road, Tsuen Wan Road, New Territories Circular Road, Lung Mun Road,
Lung Kwu Tan Road and Nim Wan Road. Alternatively,
the truck route runs directly from ATS via Shum Wan Road, Nam Long Shan Road,
Wong Chuk Hang Road, Route 1, Route 3, Tuen Mun Road, Lung Mun Road, Lung Kwu Tan Road and Nim Wan Road. With
proper on-site handling and storage as well as regular disposal of the waste,
no unacceptable environmental impact would be anticipated. Recommendations
of mitigation measures for managing general refuse are presented in Section
6.5.12 - 6.5.14.
Dredged
Sediments
6.4.16
The
Project site is located at Aberdeen Channel. DCM with partial dredging and
removal of hard materials will be adopted widely for the construction of the
proposed breakwaters (with dredging depth of about 3 m), whereas fully dredging
is required for landfalls connecting the proposed breakwaters and the
headland. Marine-based sediment would be generated from the proposed
dredging works for the construction of proposed breakwaters.
6.4.17
EPD conducts routine monitoring of the marine sediment
quality across the territory of Hong Kong waters. The nearest EPDs
sediment monitoring stations is monitoring station Hong Kong Island (South)
(SS2) located within the Southern Water Control Zone. The latest
available sediment quality data (from 2018 to 2022) are summarised in the Annual
Marine Water Quality Report 2022 published by EPD. Based on the EPDs
annual report, all the contaminants in the samples collected from SS2 were
below the LCEL in accordance with ETWB TCW No. 34/2002. Based on
the monitoring data, the samples collected from SS2 were classified as
uncontaminated Category L sediment.
6.4.18
In
order to characterise the proposed dredged sediment for marine disposal option
and pursuant to Clause 3(i) in Appendix E of the EIA
Study Brief, a SSTP was prepared with reference to ETWB TCW No. 34/2002
and was agreed by EPD on 23 November 2022, before the updates of PAH were
implemented. The SSTP details the ranges of parameters to be analysed;
the number, type and methods of sampling; sample preservation; chemical and
biological laboratory test methods to be used. The agreed SSTP is enclosed
in Appendix 6.1.
6.4.19
As proposed in the agreed SSTP under the EIA Study, a
200m x 200m sampling grid arrangement with reference to the memo Control
Measures for Management of Dredged/Excavated Contaminated Sediment issued
by DevB (ref: 0 in DEVB(W) 515/83/04) was
adopted. Based on the adopted sampling grid arrangement, a
total of 8 marine-based sediment sampling locations were proposed within the
potential area of dredging. After the agreement on the SSTP was sought,
the dredging option was confirmed and the dredging
extent was finalised. A review of validity of SSTP has been conducted and
it was confirmed that the proposed sediment sampling locations and
corresponding sampling grids fully covered the finalised dredging extent.
As such, the SSTP is considered to remain valid for the Project. The proposed
sampling locations, sampling grids and finalised dredging extent are shown in Figure 6.1.
6.4.20
The sediment quality data from the sampling and
testing works was reviewed, making reference to ETWB TCW No. 34/2002 and
the memo Control Measures for Management of Dredged/Excavated Contaminated
Sediment (ref: 0 in DEVB(W) 515/83/04), to identify and characterise the
dredged sediment, estimate the quantities of sediment to be encountered in the
Project and propose transportation routings and handling/disposal
arrangements/methods to fulfil the requirements of the EIA Study Brief.
Sediment Sampling Works
6.4.21
Ground Investigation (GI) works was conducted between
January and February 2023 according to the agreed SSTP. The sampling works were
conducted by Fugro Geotechnical Services Limited and the laboratory testing was
carried out by ALS Technichem (HK) Pty. Ltd., an
HOKLAS accredited laboratory.
6.4.22
The sediment sampling locations were conducted taken
into consideration the site constraints (e.g. restricted access due to shallow
water depth). All as-built sampling locations were still within the
corresponding sampling grid and are shown in Figure 6.1.
6.4.23
It should be noted that changes were made to the
naming of the sampling location IDs after EPDs agreement on the SSTP. The
original and revised sampling location IDs are shown in Table 6.2 and Figure 6.1. The revised
sampling location IDs will be adopted in this assessment.
Table 6.2
Original and Revised Sampling Location IDs for the Assessment
|
Original Sampling Location IDs under SSTP
|
Revised Sampling Location IDs Adopted in this Assessment
|
|
ATS-01
|
MDH5
|
|
ATS-03
|
MDH8*
|
|
MDH20*
|
|
ATS-04
|
MDH9
|
|
ATS-06
|
MDH12
|
|
ATS-07
|
MDH14
|
|
ATS-08
|
MDH15
|
|
ATS-09
|
MDH17^
|
|
ATS-10
|
MDH19^
|
Notes:
* MDH8 and MDH20 represent the same sampling location.
^ Based on the latest engineering
design, no sediment dredging works are expected within the sampling grids of
MDH17 and MDH19. As such, the samples taken from the MDH17 and MDH19 were
not assessed under this assessment.
6.4.24
The marine-based sediment sampling was carried out by
means of grab sampling at the seabed level and borehole drilling method for the
vertical sediment profiles below. Undisturbed samples using U100 and piston
sampler were collected from seabed surface, 0.9 m down, 1.9 m down, 2.9 m down
and thereafter every 3 m down to the borehole termination depth. The
depth of sediment sampling was terminated at least 1 m below the base of
sediment.
6.4.25
For MDH8, due to low sample recovery for testing, only
surface grab sample was able to be collected and tested. In order to provide sediment quality data at lower sediment
depth, additional undisturbed sediment samples were collected at MDH20, near
MDH8 and within the corresponding sampling grid, for laboratory testing.
6.4.26
Based on the latest engineering design, no sediment
dredging works are expected within the sampling grids of MDH17 and MDH19 (refer
to Figure 6.1).
As such, the samples taken from MDH17 and MDH19 were not assessed under this
assessment.
6.4.27
Grab sediment sample was also collected from EPDs
routine sediment monitoring station PS6 at Port Shelter (850234E, 820057N) on
10 February 2023 as the reference sediment sample using closed grab sampler.
Chemical and Biological Screening
6.4.28
As discussed in Section 6.4.16 above, DCM with
partial dredging and removal of hard materials will be adopted widely for the
construction of the proposed breakwaters (with dredging depth of about 3 m),
whereas fully dredging is required for landfalls connecting the proposed
breakwaters and the headland. A total 23 sediment samples from the 7
sampling locations (including sampling location MDH20 but excluding sampling
locations MDH17 and MDH19) were collected at / within the vertical dredging extent
for laboratory testing. Each sample was tested for chemical screening with
parameters as stated in ETWB TCW No. 34/2002. The chemical screening
results are summarised in Table 6.3 with
details provided in Appendix 6.2.
Laboratory analytical reports for chemical screening are provided in Appendix 6.4.
Table 6.3 Summary of
Chemical Screening Results
|
Category
|
No. of Samples
|
Percentage
|
|
Category
L (equal to or below LCEL)
|
21
|
91.30%
|
|
Category
M (above LCEL but equal to or below UCEL)
|
2
|
8.70%
|
|
Category
H (above UCEL but equal to or below 10x LCEL)
|
0
|
0%
|
|
Category
H (above 10x LCEL)
|
0
|
0%
|
|
Total:
|
23
|
100%
|
6.4.29
Based
on the chemical screening results, Category M sediment was found in 2 samples
at sampling locations MDH5. The remaining samples were identified as
Category L sediment.
6.4.30
Based
on the chemical screening results and according to ETWB TCW No. 34/2002, Tier
III biological screening was conducted on the 2 Category M sediment samples and
all the sediment samples passed the screening results. The results of the biological screening are summarised in Table 6.4 with details provided in Appendix 6.3. The laboratory
analytical reports for biological screening are provided in Appendix 6.5.
Table 6.4 Summary of
Biological Screening Results
|
Sampling ID
|
Sampling
Depth (m bgl)
|
Classification
|
Result of Biological Screening
|
|
MDH5
|
Seabed Surface
|
Category M
|
Pass
|
|
MDH5
|
1.50 1.95
|
Category M
|
Pass
|
Sediment
Disposal Options and Quantities
6.4.31
Based on the screening results and the above findings,
the disposal options for each of the sediment samples were determined in
accordance with the ETWB TCW No. 34/2002. The sediment
quantities to be generated under each disposal option were then estimated with
consideration of (i) the dredging extent for
construction of the proposed breakwaters, (ii) the depths and thicknesses of
the underlying sediment based on the sediment sampling works and (iii) the
determined disposal options of the sediment samples as based on the chemical
and biological screening results. The total volume of sediment generated is
estimated to be approximately 241,263 m3. Beneficial reuse
will be considered during the detailed design and construction phase before the
disposal of dredged sediment. Based on current estimation, the
quantities for each disposal type are presented in Table 6.5.
Detailed calculation of excavated sediment quantities and assumptions are
presented in Appendix 6.6.
Table 6.5 Estimated
Quantities of Sediment under each Disposal Option
|
Disposal Option
|
Corresponding Category
|
Estimated In-situ Quantity (1),(2)
(m3)
|
|
Type 1
Open Sea Disposal
|
Category L
Sediment
|
198,855
|
|
Type 1
Open Sea Disposal (Dedicated Sites) at disposal site(s) allocated by MFC
|
Category M
Sediment (passed the biological screening)
|
42,408
|
|
Type 2 Confined
Marine Disposal at disposal site(s) allocated by MFC
|
Category H
Sediment (does not require biological screening)
|
0
|
|
Type 3
Special Treatment/ Disposal
|
Category H
Sediment (failed biological screening)
|
0
|
|
Total
|
241,263
|
Notes:
(1)
The quantities shown in
the table are estimates based on the finalised dredging extent for the
construction of the proposed breakwaters. Possibility of reusing dredged
sediment will be subject to further review during the detailed design and
construction phase.
(2)
The estimated
quantities included marine deposit and excluded other materials such as
alluvium.
6.4.32
The sediment would be disposed of at the designated
marine disposal areas according to ETWB TCW No. 34/2002. The disposal
options for the dredged sediment should follow the procedures in ETWB TCW No
34/2002. It is assumed that a maximum of about 3 barge trips per day
will be sufficient to handle these materials to the designated marine disposal
areas during construction phase.
Subject to agreement with Marine Fill Committee (MFC) of CEDD, the marine
disposal sites for Type 1 Open Sea Disposal and Type 1 Open Sea Disposal
(Dedicated Sites) are typically South Cheung Chau and East of Ninepin.
The potential transportation routing would be via East Lamma Channel, West Lamma Fairway and South Shek Kwu Chau Fairway (for South Cheung Chau) and via East Lamma Channel, south of Hong Kong Island and Tathong Channel (for East of Ninepin).
The actual transportation routing and frequency for marine disposal to
designated disposal outlets shall be agreed with EPD/CEDD during the
construction phase prior to marine disposal. The recommended mitigation
measures for marine disposal are discussed in Section 6.5.15 - 6.5.22.
No adverse waste management implications are anticipated if the recommended
mitigation measures are implemented.
Operation
Phase
6.4.33
The operation of the Project is anticipated to
commence in 2030. Wastes arising from the operation of the Project would
include floating refuse and general refuse.
6.4.34
Floating refuse tends to accumulate near the coastline
as shoreline refuse drifted by wind and tide, especially in summer months
following heavy rains and typhoons. Floating refuse may accumulate in the
newly constructed breakwaters and wave wall in the form of floating breakwater.
In addition, general refuse would be generated from vessel users in the
ATS during operation phase. According to the Environmental Report 2023
published by MD, the marine refuse (comprising both floating refuse and refuse
from local vessels) amounted to 2,404 tonnes in 2023. The amount covered
Hong Kong waters and included the 14 gazetted typhoon shelters in Hong
Kong. As a conservative approach, assuming the gazetted typhoon shelters
generated most of the 2,404 tonnes of refuse, the estimated floating refuse and
general refuse generated in the ATS expansion area with sheltered space of
about 24 hectares (ha) would be approximately 374 kg/day (i.e. (2,404,000 kg /
423 ha x 24 ha) / 365 days).
6.4.35
According to the current practice, any floating marine
refuse will be collected by regular operation of MDs contractor and domestic
refuse collection services are provided to local vessels in ATS twice per day
by MDs contractor. With proper implementation of management control
practices, no unacceptable environmental impact (including potential hazard,
air and odour emissions, noise, wastewater discharges and wind-blown litters)
and public transport impact would thus be anticipated.
6.5
Mitigation of Adverse Environmental Impacts
Waste
Management Hierarchy
6.5.1
The waste management hierarchy has been applied in the
assessment and development of mitigation measures for waste which aims at
evaluating the desirability of waste management methods and includes the
followings in descending preference:
·
Avoidance and reduction
of waste generation;
·
Reuse of materials;
·
Recovery and recycling
of residual materials where possible; and
·
Treatment and disposal
according to relevant laws, guidelines and good practices.
6.5.2
Good site practices and waste reduction measures to
achieve avoidance and minimisation of waste generation in the hierarchy are
recommended as follow.
Good
Site Practices
6.5.3
Adverse impacts would not arise in the construction
site, provided that good site practices are strictly followed.
Recommendations for good site practices during the construction phase include:
· Nomination of approved personnel, such as a site
manager, to be responsible for implementation of good site practices,
arrangements for waste collection and effective disposal to an appropriate facility;
· Training of site personnel in site cleanliness,
concepts of waste reduction, reuse and recycling, proper waste management and
chemical waste handling procedures;
· Provision of sufficient waste reception / disposal
points, and regular collection of waste;
· Adoption of appropriate measures to minimise windblown
litter and dust during transportation of waste by either covering trucks or by
transporting wastes in enclosed containers;
· Provision of regular cleaning and maintenance
programme for drainage systems, sumps and oil interceptors, if any;
· Adoption of a recording system for the amount of wastes generated, recycled and disposed (including
the disposal sites); and
· Preparation of WMP, as a part of the EMP in accordance
with ETWB TC(W) No. 19/2005 "Environmental Management on
Construction Sites" for submission to the Architect/Engineer for approval.
Waste
Reduction Measures
6.5.4
Good management and control of construction site
activities / processes can minimise the generation of waste. Waste
reduction is best achieved at the planning and design stage, as well as by
ensuring the implementation of good site practices. Recommendations to
achieve waste reduction are discussed as follow:
· Segregate and store different types of construction
related waste in different containers, skips or stockpiles to enhance reuse or
recycling of materials and their proper disposal;
· Provide separate labelled bins to segregate recyclable
waste such as aluminium cans from other general refuse generated by the work
force, and to encourage collection by individual collectors;
· Recycle any unused chemicals or those with remaining
functional capacity;
· Maximise the use of reusable steel formwork to reduce
the amount of C&D materials;
· Adopt proper storage and site practices to minimise
the potential for damage to, or contamination of construction materials;
· Plan the delivery and stock of construction materials
carefully to minimise the amount of waste generated;
· Minimise over ordering and wastage through careful
planning during purchasing of construction materials; and
· Caisson units will be precast off-site and transported
to site for installation using semi-submersible barge and supporting tugs.
6.5.5
In addition to the above good site practices and waste
reduction measures, specific mitigation measures are recommended below for the
identified waste arising to minimise environmental impacts during the handling,
transportation and disposal of these waste.
Reducing
and Reuse of C&D Materials
6.5.6
Careful design, planning together with good site
management can reduce over-ordering and generation of C&D materials such as
concrete, mortar and cement grouts. The following potential measures are
identified to maximise reuse/recycling of C&D materials generated from the
Project:
· Formwork should be designed to minimise the use of
standard wooden panels, so that high reuse levels can be achieved;
· Alternatives such as steel formwork or plastic facing
should be considered to increase the potential for reuse; and
· Where possible, suitable materials such as the rock
armour units from the modification of the existing breakwaters are proposed for
re-use in the construction of the proposed breakwaters.
6.5.7
To minimise off-site disposal of inert C&D
materials, the excavated inert materials with suitable characteristics / size
should be reused on-site as fill material. The surplus inert C&D
materials would be transported and delivered to public filing area for
beneficial reuse as fill material by other projects. Prior to disposal of
non-inert C&D materials, steel and other metals should also be separated
for reuse and / or recycle where practicable so as to
minimise the quantity of waste to be disposed of at landfill.
Delivering
of C&D Materials
6.5.8
In
order to monitor the delivering of C&D materials at the designated PFRF and
landfill and to control fly-tipping, the following measures should be
implemented:
· A trip-ticket system should be included. One may
make reference to DEVB TC(W) No.06/2010 for details;
· A recording system for the amount of
waste generated, recycled and disposed, including the disposal sites, should be
set up;
· Warning signs should be put up to remind the
designated disposal sites;
· The application of Global Positioning System (GPS) or
equivalent systems should be incorporated on all dump trucks for real-time
tracking and monitoring;
· Closed-circuit television (CCTV) should be installed
at the vehicular entrance and exit of the site as additional measures to
prevent fly-tipping; and
· When delivering inert C&D materials at a PFRF for
beneficial reuse, the material shall only consist of soil, rock, concrete,
brick, cement plaster / mortar, inert building debris, aggregates and asphalt,
and be free from marine mud, household refuse, plastic, metals, industrial and
chemical waste, animal and vegetable matter, and other material considered to
be unsuitable by the Filling Supervisor.
Chemical
Waste
6.5.9
Mitigation
measures for chemical waste are as follow:
· If chemical waste is produced at the construction
site, the Contractor would be required to register with the EPD as a Chemical
Waste Producer and must follow the guidelines stated in the Code of Practice
on the Packaging, Labelling and Storage of Chemical Wastes;
· Good quality containers compatible with the chemical
wastes should be used, and incompatible chemicals should be stored separately;
· Appropriate labels should be securely attached on each
chemical waste container indicating the corresponding chemical characteristics
of the chemical waste, such as explosives, flammable, oxidising, irritant,
toxic, harmful, corrosive, etc; and
· The Contractor shall use a licensed collector to
transport and dispose of the chemical wastes at a licensed chemical waste
treatment and disposal facility such as CWTC at Tsing Yi in accordance with the
Waste Disposal (Chemical Waste) (General) Regulation.
Floating
Refuse
6.5.10
Apart
from collecting and storing waste with good waste management practice on site
to avoid having waste transported to sea under extreme weather conditions,
Contractor for marine works should be responsible for the collection of refuse,
if any, within the works area. Contractor shall collect and remove
floating refuse at regular intervals on a daily basis
to keep water within the site boundary and the neighbouring water free from
rubbish during the construction phase.
6.5.11
In
case of floating refuse is identified, a waste collection vessel is needed to
remove the floating materials and eventually store and dispose of together with
the general refuse, after separating the recyclables for recycling.
General
Refuse
6.5.12
General
refuse should be stored in enclosed bins or compaction units separate from
C&D materials and chemical wastes. A reputable waste collector should
be employed by the Contractor to remove general refuse from the site,
separately from C&D materials and chemical wastes, on a
daily basis to minimise odour, pest and litter impacts. The
collected general refuse will be disposed of at designated landfill.
6.5.13
Clearly labelled recycling bins should be provided on
site in order to encourage segregation and recycling
of aluminium and plastic wastes, and wastepaper in order to
reduce general refuse production.
6.5.14
The
Contractor should carry out an education programme for workers in avoiding,
reducing, reusing and recycling of materials generation. Posters and
leaflets advising on the use of the bins should also be provided onsite as
reminders. The recyclable waste materials should then be collected by
reliable waste recycling agents on a regular (e.g. daily) basis.
Dredged
Sediments
6.5.15
The
sediment should be dredged, handled, transported and disposed of in a manner
that would minimise adverse environmental impacts. Beneficial reuse will be
considered during the detailed design and construction phase before the
disposal of dredged sediment.
6.5.16
Requirements of the Air Pollution Control
(Construction Dust) Regulation, where relevant, shall be adhered to during
dredging, transportation and disposal of the sediment.
6.5.17
For off-site disposal, the basic requirements and
procedures specified under prevailing guidelines/circulars shall be
followed. MFC of CEDD is managing the disposal facilities in Hong Kong for the
dredged sediment, while EPD is the authority of issuing marine dumping permit
under the DASO.
6.5.18
For
the purpose of site allocation and application of marine dumping permit and if
considered necessary by EPD (Marine Dumping Control Section / Territorial
Control Office), separate SSTP(s) shall be submitted to EPD for agreement under
DASO. Additional GI works, based on the SSTP(s), shall then be carried
out in order to confirm the disposal arrangements of
the dredged sediment. Sediment Quality Report(s) (SQR), reporting the
chemical and biological screening results and the estimated quantities of
sediment under different disposal options, shall then be submitted to EPD for
agreement under DASO.
6.5.19
To ensure disposal space is allocated for the Project,
the Project Proponent should be responsible for obtaining agreement from MFC on
the rationale for sediment removal and the allocation of the disposal site. The
contractor(s), on the other hand, should be responsible for the application of
the marine dumping permit under DASO from EPD for the sediment disposal.
6.5.20
The dredged sediments are expected to be loaded onto
the barge and transported to the designated disposal sites allocated by
MFC. The dredged sediment would be disposed of according to its
determined disposal options and prevailing guidelines/circulars.
6.5.21
In order to minimise the potential odour / dust
emissions during dredging and transportation of the sediment, the dredged
sediments shall be wetted during dredging / material handling and shall be
properly covered when placed on barges. Loading of the dredged sediment
to the barge shall be controlled to avoid splashing and overflowing of the
sediment slurry to the surrounding water.
6.5.22
The
barge transporting the sediments to the designated disposal sites shall be
equipped with tight fitting seals to prevent leakage and shall not be filled to
a level that would cause overflow of materials or laden water during loading or
transportation. In addition, monitoring of the barge loading shall be
conducted to ensure that loss of material does not take place during
transportation. Transport barges or vessels shall be equipped with
automatic self-monitoring devices.
6.5.23
A summary of the various types of waste to be
generated during construction and operation phases of the Project, together
with the recommended handling methods and disposal routes are presented in Table 6.6.
Table 6.6
Summary of Estimated Waste Arising and Recommended Disposal
|
Waste Material Type
|
Generated From
|
Materials to be Generated
|
Total Quantity Generated (Approx.)
|
Handling Methods
|
Disposal Outlets
|
|
Construction
Phase (2026 2030)
|
|
C&D
Materials
|
General
construction works and shortening of existing breakwater
|
Inert
C&D materials
|
24,000
m3
|
Segregation from non-inert C&D materials
Reuse on-site as backfill materials
|
Tuen Mun
Area 38 Fill Bank for beneficial reuse in other projects
|
|
Non-inert
C&D materials
|
1,000
m3
|
Segregation
from inert C&D materials
Reusable
materials should be separated and recycled
|
WENT
Landfill
|
|
Chemical
Waste
|
Plant
equipment, machinery maintenance and servicing
|
Oil
/ grease, cleaning fluids, solvents, lubrication oil and fuel, used oil
filter and scrap batteries etc.
|
A
few cubic metres per month
|
Store in compatible containers in designated area on site
To be collected and/or recycled by a licensed collector
|
Recycled by licensed facility and/or disposal of at the CWTC
|
|
Floating
Refuse
|
Accumulation
along proposed breakwaters and wave wall in the form of floating breakwater
|
Food scraps, plastics, waste paper and empty containers etc.
|
Maximum
4.4 m3 per year
|
Collected by Contractor of this Project if within works area and be
handled as general refuse
|
If collected by Contractor of this Project if within works area, to be
disposed of as general refuse
|
|
General
Refuse
|
Resident
site staff and workers
|
Food
waste, plastic bottles, aluminium cans, waste papers, etc.
|
Maximum
260 kg/day
|
Reuse or recycle before disposal of at landfill
Provide on-site collection points together with recycling bins
To be collected by an appropriate waste collector to be employed by
the Contractor
|
WENT Landfill
|
|
Dredged
Sediments
|
Construction
of proposed breakwaters
|
Category
L Sediment
|
198,855
m3
|
Beneficial
reuse will be considered during the detailed design and construction phase
before the disposal of dredged sediment.
For
marine disposal, final disposal site shall be determined by MFC; typically South Cheung Chau / East of Ninepin
|
Surplus materials
would be disposed of as Type 1 - Open sea disposal
at marine disposal site(s) allocated by MFC
|
|
Category
M Sediment (passed Tier III biological screening)
|
42,408
m3
|
Final disposal site shall be determined by MFC; typically
South Cheung Chau / East of Ninepin
|
Type 1 - Open sea disposal (dedicated site) at marine disposal
site(s) allocated by MFC
|
|
Operation
Phase (2030 onwards)
|
|
Floating
Refuse
|
Accumulation
along proposed breakwaters and wave wall in the form of floating breakwater
|
Food scraps, plastics, waste paper and empty containers etc.
|
Maximum
374 kg/day (including both floating refuse and general refuse)
|
Existing regular operation of MDs contractor to collect floating
refuse in the vicinity
|
Same as the existing practice, collected by appointed contractor of
MD.
|
|
General
Refuse
|
Vessel
users
|
Food
waste, plastic bottles, aluminium cans, waste papers, etc.
|
Refer
to Floating Refuse (Operation phase) above.
|
Existing regular operation of MDs domestic refuse collection services
to collect general refuse from local vessels.
|
WENT Landfill
|
6.6
Evaluation
of Residual Impacts
6.6.1
With the
implementation of the recommended mitigation measures for the handling,
transportation and disposal of the identified waste arising, residual impacts
would not be expected during the construction and operation of the Project.
6.7
Environmental
Monitoring and Audit Requirements
Construction
Phase
6.7.1
It would be the contractors responsibility to ensure
that any wastes produced during the construction and demolition works are
handled, stored and disposed of in accordance with good waste management
practices and relevant regulations and other legislative requirements. The
recommended mitigation measures should form the basis of the site WMP to be
developed by the Contractor in the construction phase.
6.7.2
It is recommended that the waste arisings generated
during the construction activities should be audited regularly at least once
per week by the Environmental Team (ET) to determine if wastes are being
managed in accordance with approved procedures. The audits should look at all
aspects of on-site waste management practices including waste generation,
storage, recycling, transport and disposal. Apart from site inspections,
documents including licenses, permits, disposal and recycling records should be
reviewed and audited for compliance with the legislation of the recommended
good site practice and other waste management mitigation measures.
6.7.3
A WMP, as a part of the EMP, should be prepared in
accordance with ETWB TCW No.19/2005 and submitted to the Engineer for
approval. The recommended mitigation measures should form the basis of the WMP.
The monitoring and auditing requirement stated in ETWB TCW No.19/2005
should be followed with regard to the management of
C&D materials.
Operation
Phase
6.7.4
No environmental monitoring and audit (EM&A)
requirement is considered necessary during the operation phase.
6.8
Conclusion
Construction
Phase
6.8.1
Waste management implications associated with the
construction and operation of the Project were identified and assessed. During
the construction phase, waste types generated by the construction activities of
the Project would include C&D materials from general construction works and
shortening of existing breakwater, dredged sediments from dredging works,
general refuse from workforce and chemical waste from maintenance of
construction plant and equipment. Floating refuse may also be trapped and
accumulated along the shoreline and breakwaters. Provided that these wastes are
handled, transported and disposed of using approved methods and that the
recommended good site practices are strictly followed, adverse environmental
impacts during the construction phase would not be anticipated.
6.8.2
The total volume of dredged sediment generated from
the Project is estimated to be approximately 241,263 m3. Based on
the results of the chemical and biological screening, approximately 198,855 m3
of sediment is suitable for Type 1 Open Sea Disposal and 42,408 m3
of sediment is suitable for Type 1 Open Sea Disposal (Dedicated Sites) in
accordance with ETWB TCW No. 34/2002. With the implementation
of the recommended mitigation measures and in accordance with the requirements
of prevailing guidelines/circulars, no adverse
environment impacts would be expected from dredging, transportation and
disposal of marine sediment.
Operation
Phase
6.8.3
During the operation phase, the key waste types generated
will include general refuse from vessel users in the ATS. There would also be
accumulation of floating refuse on the newly constructed wave wall in the form
of floating breakwater and breakwaters of the Project. Provided that all these
wastes are handled, transported and disposed of in strict accordance with the
relevant legislative requirements and the recommended mitigation measures are
properly implemented, no adverse environmental impact is expected during the
operation phase.