6.2 Environmental Legislation, Standards and Guidelines
6.4 Identification and Evaluation of Waste Management Implications
6.7 Environmental Monitoring and Audit
Table 6.1 Key Project Elements and associated Waste Generation
Table 6.2 Estimated Amount of Inert C&D Materials to be
Generated during Construction Phase
Table 6.3 Estimated Amount of Inert C&D Materials to be Reused On-site during
Construction Phase
Table 6.4 Summary of Chemical
Screening Results (Land-based Sediment)
Table 6.5 Summary of Biological Screening Results (Land-based
Sediment)
Table 6.6 Summary of Chemical Screening Results (Marine-based
Sediment)
Table 6.7 Summary of Biological Screening Results
(Marine-based Sediment)
Table 6.8 Summary of Disposal Options
Table 6.9 Summary of Quantities of Waste Generated during
Construction Phase
Table 6.10 Tentative
Transportation Routing for Different Types of Wastes
FIGURES
Figure 6.2a Transportation
Route for Wastes (Page 1 of 2)
Figure 6.2b Transportation
Route for Wastes (Page 2 of 2)
APPENDICES
Appendix 6.1 Approved Sediment
Sampling and Testing Plan
Appendix 6.2 Summary of
Chemical Screening Test Results
Appendix 6.3 Summary of
Biological Screening Test Results
Appendix 6.4 Estimated
Volume of Land-based Sediment to be Generated
Appendix 6.5 Estimated
Volume of Marine-based Sediment to be Generated
6.1.1.1 This section
identifies potential waste that may arise from the construction of the Project,
and assesses potential environmental impacts associated with their handling and
disposal. The operation of the
Project is unlikely to produce a large quantity of waste, and adverse
environmental impacts are therefore not expected.
6.1.1.2
Options of reuse, minimisation, recycling, treatment, storage,
collection, transport and disposal of such wastes were examined. Procedures for waste reduction and
management were considered, along with recommendations for environmental
control measures to ensure that negative impacts are avoided or minimized when
appropriate.
6.2.1
General
6.2.1.1 The criteria
and guidelines for assessing waste management implications are outlined in
Annexes 7 and 15
respectively in the Technical Memorandum on Environmental Impact Assessment
(EIAO-TM) and EIA Study Brief (No. ESB-342/2021).
6.2.1.2
The following legislation is relevant to the handling, treatment
and disposal of waste in HKSAR:
·
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 Service
Ordinance – Public Cleansing and Prevention of Nuisances Regulation (Cap 132BK);
·
Dumping at Sea Ordinance (Cap 466);
·
Practice Note for Authorized Persons
and Registered Structural Engineers on Management Framework for Disposal of
Dredged/ Excavated Sediment (PNAP ADV-21); and
·
Works Bureau Technical Circular (WBTC)
No. 12/2000 Fill Management
Waste Disposal Ordinance (Cap 354)
Waste Disposal (Chemical Waste)
(General) Regulation (Cap 354C)
6.2.1.4
As defined in Schedule 1 of this Regulation, chemical waste
includes any scrap material or unwanted substance present in such a form, quantity
or concentration that causes pollution or poses an environmental or health
risk.
6.2.1.5
Under this Regulation, a person shall not produce or cause to be
produced chemical wastes unless he/she is registered with the EPD. Any person who contravenes this
requirement commits an offence and is liable to a fine and/or imprisonment.
6.2.1.6
Chemical wastes must be treated, utilising on-site plant licensed
by the EPD or have a licensed collector to transport the wastes to a licensed
facility. For each consignment of
wastes, the waste producer, collector and disposer of the chemical wastes must
sign all relevant parts of a computerised trip ticket. The system is designed to trace wastes
from production to disposal
6.2.1.7
The Regulation also prescribes the labelling and warning signs to
be displayed on site along with the storage facilities. Moreover, the waste producer is required
to prepare and make available written emergency procedures for spills, leaks,
or accidents arising from storage of chemical wastes in order to minimise
pollution and danger to human health and life. It is also necessary for waste producers
to provide employees with training on such procedures.
Waste Disposal (Charges for Disposal of Construction Waste) Regulation (Cap 354N)
6.2.1.8
Under this Regulation, wastes can only be disposed of at
designated waste disposal facilities licensed by the EPD. For construction work with a value of
more than HK$1 million, the main contractor is required to establish a billing
account at the EPD before transporting the construction waste to the designated
waste disposal facilities (for example, landfill and public fill). The vessels for delivering construction
waste to the Public Fill Reception Facilities (PFRF) require prior approval
from the Public Fill Committee (PFC).
Any breach of these regulations may lead to a fine and/or imprisonment.
Land (Miscellaneous Provisions) Ordinance (Cap 28)
6.2.1.9
The inert portion of Construction and Demolition (C&D)
materials (including rocks, soil, broken concrete, building debris, etc.) may
be taken to Public Fill Reception Facilities (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 individuals or companies who
deliver public fill to PFRFs to obtain Dumping Licenses. The licenses are issued by CEDD under
delegated authority from the Director of Lands.
Public Health and Municipal Service Ordinance – Public Cleansing and
Prevention of Nuisances Regulation (Cap 132BK)
6.2.1.10
The Regulation provides further control on illegal tipping of
wastes on unauthorised (unlicensed) sites. Illegal dumping of wastes can lead to a
fine and imprisonment.
Dumping at Sea Ordinance (Cap 466)
6.2.1.11
This Ordinance 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.
6.2.1.12
Marine disposal of any dredged/excavated sediment is subject to
control under the Dumping at Sea Ordinance (DASO). Dredged/excavated sediment destined for
marine disposal is classified based on its contaminant levels with reference to
the Practice Note for Authorized Persons and Registered Structural Engineers on
Management Framework for Disposal of Dredged/ Excavated Sediment (PNAP ADV-21) stipulated
a set of sediment quality criteria or Chemical Exceedance Levels (CEL) for
contaminants including metals, metalloid and organic pollutants.
Practice Note
for Authorized Persons and Registered Structural Engineers on Management
Framework for Disposal of Dredged/ Excavated Sediment (PNAP ADV-21)
6.2.1.13
The PNAP ADV-21 outlines the approval procedures for
dredging/excavating sediment and the marine disposal framework, the
requirements for sediment quality assessment and provides guidelines for
determining sediment classifications based on contamination levels. Furthermore, the document also set out the
arrangement for disposing of classified sediments.
Works Bureau Technical Circular (WBTC) No. 12/2000 Fill Management
6.2.1.14
WBTC 12/2000 describes the management of fill resources,
construction and demolition material, and dredged and excavated sediment.
6.2.2
Other Relevant Guidelines
6.2.2.1
The following guidelines are also related to waste management and
disposal:
·
Waste Disposal Plan for Hong Kong
(1989);
·
Hong Kong Planning Standards and
Guidelines (HKPSG), Chapter 9 – Environment;
·
Code of Practice on the Packaging, Labelling
and Storage of Chemical Wastes, EPD (1992);
·
A Guide to the Chemical Waste Control
Scheme (EPD);
·
A Guide to the Registration of Chemical
Waste Producers;
·
Works Branch Technical Circular (WBTC)
No. 32/92, The Use of Tropical Hard Wood on Construction Site;
·
WBTC No. 2/93, Public Dumps;
·
WBTC No. 2/93B, Public Filling
Facilities;
·
WBTC No. 16/96, Wet Soil in Public
Dumps;
·
WBTC Nos. 4/98 and 4/98A, Use of Public
Fill in Reclamation and Earth Filling Projects;
·
WBTC No. 19/2001, Metallic Site
Hoardings and Signboards;
·
WBTC No. 12/2002, Specifications
Facilitating the Use of Recycled Aggregates;
·
WBTC Nos. 25/99, 25/99A and 25/99C,
Incorporation of Information on Construction and Demolition Material Management
in Public Works Sub-committee Papers;
·
PNAP ADV-19, Practice Note for
Authorized Persons and Registered Structural Engineers on Construction and
Demolition Waste;
·
CEDD TC No. 11/2019, Management of
Construction and Demolition Materials;
·
Development Bureau Technical Circular
(Works) (DevB TCW) No. 06/2010, Trip Ticket System
for Disposal of Construction & Demolition Materials, Development Bureau,
Hong Kong SAR Government;
·
DevB TCW No. 08/2010, Enhanced Specification for Site Cleanliness and
Tidiness. Development Bureau, Hong
Kong SAR Government;
·
DevB TCW No. 09/2011, Enhanced Control Measures for Management of Public
Fill. Development Bureau, Hong Kong
SAR Government; and
·
Section 4.1.3 of Chapter 4 of the
Project Administration Handbook (PAH) for Civil Engineering Works, Management
of Construction and Demolition Materials including Rock.
6.3.1
Construction Phase
6.3.1.1
The assessment approach was based on the criteria and guidelines
for assessing waste management implications as stated in Annexes 7 and 15 of
the EIAO-TM and the EIA Study Brief No.
ESB-342/2021.
6.3.1.2
The waste management hierarchy has been applied in assessing and
developing mitigation measures associated with the waste generation. A waste management hierarchy ranks waste
management methods according to their desirability, and includes the following
methods in descending order:
·
Avoidance;
·
Minimisation;
·
Recycling/ reuse;
·
Treatment; and
·
Disposal.
6.3.1.3
All opportunities for reducing waste generation were assessed
based upon the following factors:
·
Avoiding or minimising waste generation
through changes in the design;
·
Adopting better management practices to
promote segregation of waste materials;
·
Reuse and recycle; and
·
Diverting waste to public fill
reception facilities or other construction sites.
6.3.1.4
The selected option in Sections 2.5 – 2.7 have considered the design, general layout, construction methods and
programme to minimise the waste generation from the Project. The following key items to minimise the
generation of waste are taken into consideration:
·
Avoid reclamation for the ATCL alignment
to minimise waste generation (refer to Section 2.5.1.5);
·
Avoid additional structures for
flyover/viaduct, such as bored piles, excavation works at Scenic Hill for ATCL
alignment to minimise waste generation (refer to Section 2.5.1.7) ;
·
Avoid open sea dredging to minimise the
marine sediment generation (refer to Table 2.7);
·
Minimise the chance of floating refuse
trapped or accumulated within the Project area (refer to Table 2.7);
·
Minimise the waste generation by
adopting the precast method and casting the pier column/ bridge deck off site
(refer to Table
2.8); and
·
Minimise the waste generation by
adopting the steel formworks instead of timber (refer to Table 2.8).
6.3.1.5
The types and quantities of waste were estimated,
and disposal options for each category of waste were identified, as well as the
environmental impacts of the handling, collection and disposal of waste. In reference to the following approach,
the potential environmental impacts associated with the handling,
transportation and disposal of waste resulting from the construction work were
assessed:
·
Estimation of the types, timing and
quantities of the wastes to be generated; and
·
Assessment of the potential
environmental impacts on the capacity of waste collection, transfer and
disposal facilities.
6.3.1.6
The impact caused by handling (including stockpiling, labelling,
packaging and storage), collection, transportation and re-use/disposal of
wastes was addressed in detail and appropriate mitigation measures were
proposed. This assessment covered
the following areas: potential hazard, air and odour emissions, noise, wastewater
discharge and public transport caused by handling (including stockpiling,
labelling, packaging & storage), collection, transportation and reuse/
disposal of different types of waste.
6.3.2
Operational Phase
6.3.2.1
The assessment of waste management implications has been
undertaken in accordance with Annexes 7 and 15 of the EIAO-TM and the EIA Study
Brief No. ESB-342/2021. The
waste management hierarchy comprising avoidance, minimization, recycling/
reuse, treatment and disposal has also been adopted for the assessment.
Proposal for Waste Management
6.3.2.2
The disposal options for various types of waste have been
evaluated before considering options for reducing waste generation, on-site or
off-site recycling, and reuse. After
considering the opportunities for reducing waste generation and maximizing
reuse, the types and quantities of the remaining wastes required to be disposed
of have been estimated and the disposal options for each type of wastes have
been described. The potential environmental impacts from the management
of wastes have been assessed and relevant mitigation measures have been
proposed.
6.4.1
Construction Phase
6.4.1.1
The waste generated from the construction of the Project would be classified
into distinct categories based on their nature and disposal options. These could include:
·
Construction and Demolition (C&D)
materials;
·
Land-based and Marine-based sediment;
·
Chemical waste;
·
General refuse; and
·
Floating refuse.
Main Construction Activities and Waste
Generation
6.4.1.2
During the construction phase, the main activities which would
potentially result in the generation of waste include site clearance, site
formation, excavation, foundation works for the marine facilities and ATCL, as
well as stations and associated facilities. No baring point or
conveyor system will be established, constructed or operated under the Project
and in the Project area. Only
existing public barging point will be used in the Project. A summary of key project elements and the
associated waste generation is given Table 6.1.
Table 6.1 Key Project
Elements and associated Waste Generation
|
Key
Project Elements |
Construction Activities |
Potential types of Waste to be
Generated |
|
ATCL alignment- Marine Viaduct Section |
·
Site clearance ·
In-situ concreting ·
Bored piles and pile caps ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse ·
Floating refuse ·
Marine-based
sediment |
|
ATCL alignment - At-grade Section |
·
Site clearance ·
In-situ concreting ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse |
|
ATCL alignment - Land Viaduct Section |
·
Site clearance ·
Bored piles and pile caps ·
In-situ concreting ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse ·
Land-based
sediment |
|
Depot |
·
Site clearance ·
Minor site formation ·
In-situ concreting ·
Superstructure construction ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse |
|
Marine Facilities |
·
Site clearance ·
In-situ concreting ·
Bored piles and pile caps ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse ·
Floating refuse ·
Marine-based sediment |
|
Stations (TCC, ECSA-S, ECSA-N, AL, Academy) and associated footbridges |
·
Site clearance ·
Socketed H-piles construction ·
Foundation works ·
Site reinstatement |
·
C&D material ·
Chemical waste ·
General refuse ·
Land-based sediment |
Construction and Demolition (C&D) Materials
6.4.1.3 Refer to Section 6.3.1.4, the design, layout, construction
method, and programme have all been considered to reduce the generation of
inert C&D materials during construction phase.
6.4.1.4
C&D materials generated during construction would comprise
materials that are suitable for reuse on-site or as public fill and a portion
of waste material that will require disposal to landfill. For the purposes of this assessment,
these two fractions denoted as inert C&D materials (i.e. soil, rock,
rubble, concrete) and non-inert C&D materials (i.e. timber, bamboo, vegetation, packaging
waste) are discussed below.
6.4.1.5
The temporary storage of C&D materials may contribute to the
generation of dust, visual impacts from unsightliness and water quality impacts
from runoff. The disposal of
C&D materials also has the potential to result in noise and dust impacts
from loading and unloading and emissions from haul vehicles.
6.4.1.6
The C&D materials cannot be reused on-site will be delivered
to PFRFs directly to avoid dust and secondary pollution. Mitigation measures on storage and
transportation of C&D materials shall be implemented to minimize the impacts
during delivering/transportation.
6.4.1.7
Based on the latest layout, it was estimated that a total of 21,379m3
of inert C&D materials would arise from the Project. The piling works, excavation works and construction
of structures works would be the major activities that generate the majority of
C&D materials in the Project. Based
on the tentative construction programme (refer to Appendix 2.1), the
estimated amount inert C&D materials to be generated by year during the
construction phase are summarised in Table 6.2.
Table
6.2 Estimated Amount
of Inert C&D Materials to be Generated during Construction Phase
|
Construction
Activities |
Estimated
Amount of Inert C&D Materials to be Generated, m3 |
||||
|
Year |
2025 |
2026 |
2027 |
2028 |
Total |
|
Piling Works |
233 |
1,312 |
1,013 |
33 |
2,591 |
|
Construction
of Structures |
145 |
897 |
539 |
2 |
1,583 |
|
Excavation
Works |
1,413 |
8,401 |
6,368 |
1,023 |
17,205 |
6.4.1.8 The inert
C&D materials should be reused on-site as far as practicable before
exported off-site or delivered to PFRF (Tuen Mun Area
38 Fill Bank or Chai Wan Public Fill Barging Point) for beneficial use in other
projects with potential fill demand in order to minimise the net amount of
inert C&D materials generated from the Project. Most of the C&D materials are inert
materials and potentially can be reused on-site, the generated inert C&D
materials will be reuse for backfilling along the ATCL. Estimated 5,963m3 of inert
C&D materials would be reused from the Project. The estimated amount of inert C&D
materials to be reused on site during construction phase by year are summarised
in Table 6.3.
Table
6.3 Estimated Amount
of Inert C&D Materials
to be Reused On-site during Construction Phase
|
Estimated
Amount of Inert C&D Material to be Reused On-site, m3 |
|||||
|
Year |
2025 |
2026 |
2027 |
2028 |
Total |
|
Piling Works |
15 |
75 |
31 |
0 |
121 |
|
Construction of Structures |
2 |
11 |
3 |
0 |
16 |
|
Excavation
Works |
430 |
2,568 |
2,424 |
404 |
5,826 |
6.4.1.9
In addition to the inert C&D materials that would be generated
by the Project and would be suitable for reuse on-site and as public fill, a
total of 1,950 m3 of non-inert C&D material would also be
generated and include:
·
Cleared vegetation and top soil from
site clearance;
·
Wood from formwork; and
·
Materials and equipment wrappings etc.
6.4.1.10
During the erection of formwork, wood wastage can be reduced
through use of prefabricated elements which minimises in-situ casting and use
of formwork. Through good site
practices and specification of appropriate procedures for construction works,
useful materials could be reused and recycled as far as possible and thus
further reduce waste generation. Estimated
450m3 of non-inert C&D materials would be reused from the
Project.
6.4.1.11
The stockpiling area for prefabrication units or construction
materials (e.g. non-inert materials) storage located near marine viaduct at the
Tung Chung area is proposed, the materials should be properly stored and covered
with impervious sheeting to prevent any dust emission. With the implementation
of mitigation measures and good site practices for handling and storage of the
construction materials stated in Section
6.5.1, adverse dust impact and other environmental pollution nuisance is not
anticipated. The location of the
stockpiling area of construction materials is indicated in Figure 6.2.
6.4.1.12
Measures would be implemented to minimise the generation of non-inert
C&D materials and to prevent contamination for sorting of non-C&D
materials at the designated areas. Non-inert
C&D materials such as wood, glass and plastic should be recycled as far as
practicable before disposal to landfill (West New Territories Landfill) as a
last resort. The handling,
storage, or disposal of these materials are not expected to have adverse
environmental impacts.
Land-based and Marine-based Sediment
6.4.1.13
Excavation works and construction of bored piles
will be carried out for land viaduct. The areas of the proposed excavation of land-based
sediment are shown in Figure 6.1.
6.4.1.14
Bored piles with casing will be used to construct the foundation of
the marine facilities and viaducts. Nevertheless, it is unavoidable that
marine-based sediment will have to be excavated from the bored piles for the
construction of the foundation. The areas of the proposed excavation of marine-based
sediment are shown in Figure 6.1.
6.4.1.15
A sediment sampling and testing plan (SSTP) and an updated SSTP to
serve the purpose of fulfilling this EIA study under the EIAO were approved by
EPD on 1 December 2021 and 7 July 2022 respectively. The final approved SSTP is provided in Appendix 6.1. According to the SSTP,
sediment contamination is expected to be Category L and Category M. A sampling grid of 200 meters x 200
meters has been adopted based on paragraph 4(a) of memo issued by Development
Bureau on 6 October 2010, “Control Measures for Management of Dredged/Excavated
Contaminated Sediment” (ref: 0 in DevB(W) 515/83/04).
Total 23 boreholes are proposed for
land-based and marine-based sediment samplings at the sediment excavation areas. Construction areas that only involve
shallow excavation (e.g. road diversions) which will not include piling works
or encounter marine sediment are excluded from the sampling works. Due to underground structures,
underground utilities and safety issues, the boreholes were deviated from the
proposed locations but are still within the sampling grid proposed in the
approved SSTP. The as-built
sampling locations are shown in Figure 6.1.
6.4.1.16
Site investigation works were conducted from May 2022 to September
2022 based on the approved SSTP. BHE1
– BHE4 and BHD4 are representing the marine-based sediments while BHD1 – BHD3
and BHD5 – BHD19 are representing the land-based sediment. The as-built sampling locations of the
boreholes are given in Figure 6.1. Except
for BHD5 and BHD6, all proposed boreholes (BHD1-BHD4, BHD7-19 and BHE1-4) in
the approved SSTP were encountered with either land-based sediment or
marine-based sediment.
Land-based
Sediment
6.4.1.17
Total 78 samples from 16 sampling boreholes were collected for
chemical screening. Based on the
chemical screening results, 8 samples from BHD2, BHD3, BHD7, BHD9, BHD11 and
BHD12 were exceeded the Lower Chemical Exceedance Level (LCEL) but below the Upper
Chemical Exceedance Level (UCEL).
The remaining samples were identified as Category L sediment. Summary of chemical screening results for
land-based sediment are tabulated in Table 6.4 and detailed
chemical screening results are attached in Appendix 6.2.
Table 6.4 Summary of Chemical Screening
Results (Land-based Sediment)
|
Category |
No. of Samples |
Percentage
of Samples Collected |
|
Category L (equal to or
below LCEL) |
70 |
89.7% |
|
Category M (above LCEL
but equal to or below UCEL) |
8 |
10.3% |
|
Total |
78 |
100.0% |
6.4.1.18 The samples
exceeded LCEL were conducted biological screening, summary of biological screening
results for land-based sediment are tabulated in Table 6.5 and detailed
biological results are attached in Appendix 6.3.
Table
6.5 Summary of
Biological Screening Results (Land-based Sediment)
|
Biological
Screening Results |
No. of
Samples Passed |
No. of
Samples Failed |
Percentage
of Samples Passed |
|
10-day
burrowing amphipod survival test |
8 |
0 |
100% |
|
20-day
burrowing polychaete survival and growth test |
8 |
0 |
100% |
|
48-96 hour larvae (bivalve or
echinoderm) survival and normality test |
8 |
0 |
100% |
|
Total |
8 |
0 |
100% |
Marine-based Sediment
6.4.1.19 Total 36
samples from 5 sampling boreholes were collected for chemical screening. Based on the chemical screening results,
14 samples from BHD4, BHE1, BHE2, BHE3, and BHE4 were exceeded the LCEL but
below the UCEL. The remaining
samples were identified as Category L sediment. Summary of chemical screening results for
marine-based sediment are tabulated in Table 6.6 and detailed
chemical screening results are attached in Appendix 6.2.
Table 6.6 Summary
of Chemical Screening Results (Marine-based Sediment)
|
Category |
No. of
Samples |
Percentage
of Samples Collected |
|
Category L (equal to or
below LCEL) |
22 |
61.1% |
|
Category M (above LCEL
but equal to or below UCEL) |
14 |
38.9% |
|
Total |
36 |
100.0% |
6.4.1.20
The samples exceeded LCEL were conducted biological screening,
summary of biological screening results for marine-based sediment are tabulated
in Table 6.7 and detailed
biological results are attached in Appendix 6.3.
Table
6.7 Summary of
Biological Screening Results (Marine-based Sediment)
|
Biological
Screening Results |
No. of
Samples Passed |
No. of
Samples Failed |
Percentage
of Samples Passed |
|
10-day
burrowing amphipod survival test |
14 |
0 |
100% |
|
20-day
burrowing polychaete survival and growth test |
14 |
0 |
100% |
|
48-96 hour larvae (bivalve or
echinoderm) survival and normality test |
14 |
0 |
100% |
|
Total |
14 |
0 |
100% |
6.4.1.21
According to the PNAP ADV-21, the chemical and biological screening results determined
the classification and disposal arrangement for the sediments. It is anticipated that only
approximately 2,803m3 of marine sediment would be generated
through mucking out activity during piling and excavation works along ATCL,
construction of marine facilities and its associated facilities. Approximate
375m3 will be reused on site and 1,895m3 of marine
sediment will be disposed for Type 1 open sea disposal and 533m3 will
be disposed to the Type 1- Open Sea Disposal (Dedicated Sites) at disposal site
allocated by MFC. No marine
sediment failed the biological and Type 2- Confined Marine Disposal and Type 3-
Special Treatment/Disposal is not required for this Project. Summary of the disposal options and estimation
of the volume of land-based and marine-based sediments to be generated are
provided in Appendix 6.4, Appendix 6.5 and Table 6.8.
Table 6.8 Summary
of Disposal Options
|
Marine
Sediment Category |
Estimated
Volume to be excavated (m3) |
Tentative
Volume to be reused on-site (m3) |
Tentative
Volume to be disposed (m3) |
|
|
Type 1 - Open Sea Disposal |
Category L |
2,270 |
375 |
1,895 |
|
Type 1 - Open Sea Disposal (Dedicated Sites)
at disposal site(s) allocated by MFC |
Category M (passed the biological screening) |
533 |
0 |
533 |
|
Type 2 – Confined Marine Disposal |
Category M (failed the biological screening) |
0 |
0 |
0 |
|
Category H (not require biological screening or passed
in biological screening) |
0 |
0 |
0 |
|
|
Type 3 – Special Treatment / Disposal |
Category H (failed in biological screening |
0 |
0 |
0 |
|
Total |
2,803 |
375 |
2,428 |
|
6.4.1.22
In order to minimize
environmental impact, it is best to reuse as much sediment as possible within
the Project site. It should be
explored whether land-based sediment can be reused on site, including as stabilization
/ solidification (S/S) technique prior to reuse by mixing with cement (e.g. Portland cement). For marine-based sediment treatment for
reuse would be further explored subject to the land area requirements,
environmental impacts of treatment methods, the physical properties (e.g. water
content) of dredged sediments, the off-site disposal should be considered as a
last resort. Most of the land-based
marine sediment is generated from the construction of bored piles. Possible
re-use locations for the treated sediment include the landscape areas. Subject to availability of suitable
location and review on the backfilling method during detailed design stage,
part of the land-based sediment would be reused on site. In order to reuse the marine sediment for
backfilling, the treated marine sediment will be provided with the necessary
strength. Moreover, the treated
marine sediment will be tested for Toxicity Characteristic Leaching Procedure
(TCLP) and Unconfined Compressive Strength (UCS) and should meet the Universal
Treatment Standards (UTS) with reference to EPD’s Practice Guide for
Investigation and Remediation of Contaminated Land and the UCS standard prior
to reuse. Only treated marine
sediment which passed the UTS and UCS standards can be reused as backfilling in
the Project. If the treated marine
sediment failed the UTS and UCS requirements, it will need to undergo the S/S
process again. A pilot-scale trial
should be carried out before the commencement of treatment to determine the
ratio of cement/sediment that could meet the treatment standard. When all other options for reusing the land-based
sediment have been considered, land-based sediment disposal should be
considered as the last option.
6.4.1.23
Should disposal of sediment is
unavoidable, the Contractor shall be responsible for the arrangement of its
management and disposal. If the
sediment is to be disposed of, the Contractor shall be responsible for the
application of the Dumping at Sea Ordinance (DASO) permit required including
carrying out the field investigations, samplings, chemical and biological
laboratory testings to characterize the sediment/ mud
concerned in accordance with the requirements stipulated under PNAP ADV-21.
6.4.1.24
The Project Proponent / Contractor would need to obtain Marine
Fill Committee's agreement on the rationale for sediment removal / disposal as
early as possible and make relevant submissions under PNAP ADV-21 to EPD's Marine Dumping Control Section/Territorial
Control Office (TCO).
6.4.1.25
During the excavation and transportation of the sediment,
potential odour may arise. In order
to minimise the impact, the excavated sediments shall properly covered when placed on trucks or barges. Loading of the excavated sediment to the
barge shall be controlled to avoid splashing and overflowing of the sediment
slurry to the surrounding water. Section 6.5 will further discuss on the
mitigation measures for marine sediment disposal.
Chemical Waste
6.4.1.26
In the course of construction activities for the Project, the
following chemical wastes are likely to be generated:
·
Scrap batteries or acid/alkali from
fire appliance maintenance activities;
·
Used paints, engine oils, hydraulic
fluids and waste fuel;
·
Spent mineral oils/cleansing fluids
from machineries; and
·
Spent solvent/solution, some of which
may be halogenated, from equipment cleansing activities.
6.4.1.27
Chemical wastes may pose environmental, health and safety hazards
if not stored and disposed of appropriately as outlined in the Waste Disposal
(Chemical Waste) (General) Regulation and the Code of Practice on the Packing,
Labelling and Storage of Chemical Waste. These hazards may include:
·
Toxic effects to workers;
·
Adverse effects on air quality, water
quality and land contamination due to spillage;
·
Hazards of fire; and
·
Disruption of sewage treatment works
should the chemical waste enter the sewerage system.
6.4.1.28
The generation of chemical wastes from the construction plant and
equipment to be used during construction phase is limited and it is anticipated
that <100L of chemical wastes would be generated every month. With the appropriate procedures to
handle, store, transport and dispose of the chemical waste generated, adverse environmental
and health impacts including the potential hazards of fire would not be anticipated.
6.4.1.29
Notwithstanding, the Contractor should register with EPD as a
Chemical Waste Producer pursuant to the Regulation and the chemical waste
should be collected by licensed chemical waste collectors for subsequent
disposal at licensed chemical waste disposal facilities, for example the
Chemical Waste Treatment Centre (CWTC) in Tsing Yi. Hence, no adverse chemical waste impacts
arising from the construction phase are anticipated.
General Refuse
6.4.1.30
The construction site with workers and site
office would generate a range of general refuse that will need to be disposed
of, including food waste, aluminum cans, and waste
paper, etc.
6.4.1.31
The number of workers is not available at this stage but it is
anticipated that there will be no more than 250 staff to be stationed on site
at any one time during the construction phase of the Project. Based on a
waste generation of 0.94kg per person stated in the Monitoring of Solid Waste
in Hong Kong Waste Statistics for 2021, the estimated daily amount of
general refuse would be 235 kg, that is, about 198 tonnes of general refuse
would be generated in the 30 months of the construction period.
6.4.1.32
The storage of general refuse has the potential to cause adverse environmental
impacts, for example odour nuisance if the waste is not collected frequently,
windblown litter, water quality impacts if the waste enters water bodies,
visual impacts, etc. Construction
sites may also attract pests, vermin and other disease vectors if the waste
storage areas were not well maintained.
Disposal of waste at areas other than approved refuse transfer stations
and landfills can also lead to similar adverse impacts.
6.4.1.33
Provided that mitigation measures are adopted, adverse environmental
impacts caused by the storage, handling, transport and disposal of general
refuse would not be anticipated.
6.4.1.34
It is recommended that the general refuse should be classified and
any recyclable wastes, including aluminum cans,
papers, plastic bottles etc. should be sorted and collected for recycling. Other non-recyclable waste should be
collected on a daily basis and disposed of at landfill.
Floating Refuse
6.4.1.35
According to Section 2.5.3, the
location of wave attenuator for the marine facilities has been carefully designated
to minimise the chance of trapping floating refuse. The other option (MF-A) providing a relatively
sharp turn and cause addition floating refuse easily trapped or accumulated within
the Project area. Considering the
location option, the preferred option (MF-B) is located between Airport Island
and HKP Island, and the waste potentially trapped or accumulated will be
similar to the existing situation. Only limited amount of refuse may be trapped
along the shoreline at marine facilities during heavy rains or typhoons.
6.4.1.36
However, potential floating refuse generated by the site workers may
be concerned due to poor site waste management. As the maximum number of workers working
at the marine facilities site will be 30-40 at a same time, no adverse impact
from the waste generated by site workers is anticipated. With proper site waste management and provision
of adequate rubbish bins for site workers, floating refuse arising from the
construction activities is not anticipated. Any refuse generated during construction
site should be stored in enclosed bin to avoid adverse impacts to the
surroundings, including marine environment. Moreover, floating refuse at the
embayment may be found/trapped along the shoreline of the Project or
unintentionally brought from the project site into the shoreline during heavy
rains or typhoons. However, if any refuse is accidentally trapped in the marine
waters within the Project Area, it will be collected by the Contractor
regularly and disposed of a general refuse if any refuse is accidentally
trapped in the marine waters within the Project Area.
6.4.1.37 With
reference to the Tung Chung New Town Extension EIA (AEIAR-196/2016), it is
estimated that 11.5m3 of floating refuse would be collected from the
3.4km long artificial seawall during the construction phase. Considering the
total length at the embayment of this Project is 0.9km long, it is anticipated
that approximately 3m3 of floating refuse would be collected every
year by the Contractor and disposed of as general refuse.
Summary of Quantities of Waste generated
during Construction Phase
6.4.1.38 The estimated
types and quantities of waste to be generated by the Project implementation and
recommended disposal options are summarised in Table 6.9.
Table 6.9 Summary
of Quantities of Waste Generated during Construction Phase
|
Waste Type |
Estimated Quantity |
Proposed Handling/ Disposal Method |
|||
|
Generated |
Re-use/Recycle |
Disposal |
|||
|
On-site |
Off-site |
||||
|
Inert C&D Materials |
21,379m3 |
5,963m3 |
0m3 |
15,416m3 |
Tuen Mun Area
38 Fill Bank or Chai Wan Public Fill Barging Point |
|
Non-Inert C&D
Materials (Metal, paper and plastics etc.) |
1,950m3 |
450m3 |
1,500m3 |
Metal, Paper & Plastic will be recycled as far as possible,
the remaining materials will be disposed at West New Territories (WENT)
Landfill |
|
|
Land-based sediment |
2,136m3 |
375m3 |
1,761m3 |
Treatment by Cement S/S and reuse onsite as backfilling
materials, the remaining land-based marine sediment will be tentative
disposed to South Cheung Chau and East of Ninepin. Final disposal sites shall be determined by MFC. Off-site
disposal should be considered as a last resort. |
|
|
Marine-based sediment |
667 m3 |
0m3 |
667m3 |
Treatment for reuse (e.g. Treatment by Cement S/S) would be
further explored, off-site disposal should be considered as a last resort.
Marine-based sediment will be tentative disposed to South Cheung Chau and
East of Ninepin. Final disposal
sites shall be determined by MFC.
|
|
|
Chemical Waste |
<100L per month |
0 L |
<100L per month |
Chemical Waste Collector to Chemical Waste Treatment Centre in
Tsing Yi and other licensed disposal facilities |
|
|
General Refuse |
198
Tonnes (Up to 235
kg per day) |
9 Tonnes |
189
Tonnes (Up to 235 kg
per day) |
Recycle as far as possible, then disposal the non-recyclable
refuse at West New Territories (WENT) Landfill |
|
|
Floating Refuse |
3m3
per
year |
1m3 per
year |
2m3 per year |
Recycle as far as possible, then disposal the non-recyclable
refuse at West New Territories (WENT) Landfill |
|
Transportation Arrangement for Waste Disposal during Construction Phase
6.4.1.39
No barging points or conveyor systems will
be established, constructed or operated under the Project and in the Project
area. Only existing barging point
will be used in the Project. The waste generated from the Project will be
delivered and disposed by land/marine transportation to the designated disposal
location. According to Table 6.2, taken year 2026 into consideration, the maximum inert C&D materials
to be disposed will be approximate 7,956m3, with bulk factor 1.1 and
general capacity of construction truck is about 7.5m3 and barge
capacity is about 300m3, about 4 trucks and 1 barge per day is
expected for delivering the inert C&D materials. Beside inert C&D materials, about 1
truck per day will be used for delivering the non-inert C&D materials and
general refuse.
6.4.1.40
Category L and Category M marine
sediments were found at the Project Site. The tentative disposal outlet for open
sea disposal of dredged sediment will be at South Cheung Chau and East of Ninepin.
The final disposal sites shall be
determined by MFC and exact transportation routing for disposal will be proposed
when applying the dumping permit.
6.4.1.41 The tentative transportation routing for the disposal of different types
of wastes generated during the construction phase is summarised in Table 6.10 and illustrated in Figure 6.2a and Figure 6.2b.
Table
6.10 Tentative Transportation Routing for Different Types
of Wastes
|
Waste Type |
Proposed Disposal
Outlet |
Tentative
transportation Routing |
Frequency |
|
Inert C&D Materials |
Tuen Mun Area
38 Fill Bank or
Chai Wan Public Fill Barging Point |
Tuen Mun Area
38 Fill Bank: Via North Lantau Highways, Chek Lap Kok Road, TM-CLK Link, Lung Mun Road Chai Wan Public Fill Barging
Point: Via Ha Pang Fairway, Kap Shui Mun
Fairway, Western Fairway, Northern Fairway, Central Fairway, Hung Hom Fairway and Eastern Fairway |
Maximum 4 trucks/ day and 1 barge/ day |
|
-Non-Inert C&D Materials (exclude materials would be
collected by recycler) -General Refuse -Floating Refuse |
West New Territories Landfill |
Via Chek Lap Kok
Road, North Lantau Highway, Shun Long Road, TM-CLK Link, Lung Mun Road, Lung Kun Tan Road, Nim Wan Road |
Maximum 1 truck/ day |
|
Chemical Waste |
Chemical Waste Treatment Centre in Tsing Yi |
Via Airport Road, Chek Lap Kok Road, North Lantau Highway Road, Lantau Link, Tsing
Sha Highway, Tsing Yi Road |
Maximum 1 truck/ day |
|
Marine sediments |
South Cheung Chau and East of Ninepin* |
East of Ninepin: Via Kwo Lo Wan Road, Scenic Road, Chek Lap Kok South Road barging
point#, Ha Pang Fairway, Kap Shui Mun
Fairway, Western Fairway, Northern Fairway, Central Fairway, Hung Hom Fairway, Eastern Fairway and Tathong
Channel South Cheung Chau: Via Kwo Lo Wan Road, Scenic Road, Chek Lap Kok South Road barging
point#, west of Lamma Island, Western
Fairway, and West Lamma Channel |
Maximum 3 trucks and 1 barge/day |
Remarks: *Final disposal sites shall be determined by MFC
#Existing
barging point which is not established, constructed or operated under the
Project
6.4.2
Operational Phase
6.4.2.1
The operation of the Project would generate the following
categories of wastes:
·
Municipal solid waste;
·
Chemical waste;
·
Floating refuse; and
·
Marine sediment from maintenance
dredging.
Municipal Solid Waste (MSW)
6.4.2.2
During the operational phase, MSW such as paper, plastic and
office waste (i.e. paper, food, plastic bottles, aluminium cans) would be
generated by staff and passengers, and scrap materials from road and
maintenance, and discarded materials from maintenance of the vehicles
(i.e. metal parts of the vehicles).
6.4.2.3
The storage and handling of these wastes may cause adverse
environmental impacts. The amount
of general refuse that would arise during operational phase of the Project
cannot be confirmed at this stage since it would be subject to operational
needs and the number of staff and passengers in future. The estimated number of staff would be around 30, subject to operational need in the
future. Based on a waste generation
of 0.94kg per person stated in the Monitoring of Solid Waste in Hong Kong Waste
Statistics for 2021, the estimated daily amount of general refuse would be 29
kg, that is, about 11 tonnes of general refuse would be generated annually from
the site staff during operational phase.
6.4.2.4
Additionally, approximately 100 kg of general refuse is
anticipated to be generated daily by the passengers during the operational
phase, subject to further review. The
most common types of waste generated by the passengers are food, paper, cans and
plastic. No adverse impact from the
amount of MSW generated from the passengers is anticipated.
6.4.2.5
The general refuse and waste from maintenance activities would
include paper, plastic, food, plastic bottles, aluminium cans, scrap materials,
discarded materials, etc. The total
quantity of municipal solid waste to be generated from staff and passengers is relatively
small and the wastes shall be collected by the reputable waste collector
regularly. Therefore, no adverse environmental impact is anticipated.
Chemical Waste
6.4.2.6
Maintenance activities in depot would generate chemical waste
including scrap batteries, used fluorescent tubes,
cleansing materials and discarded electronic equipment. In
addition, lubricants, paints, used batteries, mineral oil, coolants, and
solvents would be generated during the operational phase. In view of the
chemical wastes generated from the operational activities, it is anticipated
that only a few hundred kilograms of scrap batteries and <100L of chemical
wastes would be generated every month.
This waste may pose environmental, health and safety
hazards. Measures as stipulated in the Waste Disposal (Chemical
Waste) (general) Regulation and the Code of Practice on the
Packaging, Labelling and Storage of Chemical Wastes would be strictly
followed for the handling and disposal of chemical waste.
6.4.2.7
These wastes may pose adverse environmental, health and safety
hazard if not properly managed. Considering the maximum quantity of
chemical waste to be generated during the operational phase would be <100L
per month, subject to future operational needs, no adverse environmental impact
is anticipated with proper storage, handling and disposal of this
waste. An Emergency Response Plan
to prevent and handle chemical spillages caused by the depot operations during
operational phase shall be prepared.
Floating Refuse
6.4.2.8
With the provision of adequate rubbish bins at marine facilities
and along ATCL, floating refuse arisen from the Project is not expected. Considering that the floating refuse from
outside waters may be trapped by the berthing facilities and floating pontoons,
control measures such as regular inspection and collection of floating refuse
within the Project area should be implemented. In reference to Section 6.4.1.37, approximate 3m3 of floating refuse will
be collected annually, regular clean up of floating
refuse will be carried out by AAHK or it’s operator(s). With the implementation
of the control measures, the adverse impact from the accumulation of floating
refuse is not anticipated.
Marine-based Sediment during Maintenance Dredging
6.4.2.9
Maintenance dredging within the
proposed marine facilities would be required regularly to maintain safe
navigable water depth close to the existing seabed level. The timing and extent of dredging will
be planned based on findings of regular geophysical surveys. Maintenance
dredging will be carried out in every two years. The maintenance dredging would be
required during operation of the proposed marine facilities. The timing and extend of dredging will be
further review based on findings of regular geophysical surveys. In order to restore the seabed level to
the current level every two years, maximum 500mm depth marine sediment will be
dredged during maintenance dredging. The maximum maintenance dredging area is
about 70,000m2, which equivalent to the dredging volume of 35,000m3.
The maximum working rate for
maintenance dredging is assumed to be 40m3 per hour and only one
closed grab dredger will be working in any time. It assumes maximum 480m3 will
be dredged daily, which 2 barge trips for disposal will be required daily. Similar to the arrangement for project
construction, sediment sampling, testing, handling and disposal procedures as
stipulated by the PNAP ADV-21 will be followed and complied with. The marine disposal site will be
allocated by the MFC/CEDD based on the sediment quality. Adverse impact from the maintenance
dredging is not anticipated.
6.5.1
Construction Phase
6.5.1.1
The mitigation measures for construction phase are recommended
based on the waste management hierarchy principles. Recommendations of
good site practices, waste reduction measures as well as the waste storage,
collection and transportation are described in the following sub-sections.
Good Site Practices
6.5.1.2
Adverse waste management implications are not expected, provided
that good site practices are strictly implemented. The following good site practices are
recommended throughout the construction activities:
·
Nomination of an approved personnel,
such as a site manager, to be responsible for the implementation of good site
practices, arrangements for collection and effective disposal to an appropriate
facility, of all wastes generated at the site;
·
Training of site personnel in site
cleanliness, appropriate waste management procedures and concepts of waste
reduction, reuse and recycling;
·
Provision of sufficient waste disposal
points and regular collection for disposal;
·
Appropriate measures to minimize
windblown litter and dust during transportation of waste by either covering
trucks or by transporting wastes in enclosed containers;
·
Regular cleaning and maintenance
programme for drainage systems, sumps and oil interceptors;
·
Provision of wheel washing facilities
at site exit before the trucks leave the works areas to minimize dust
disturbance due to the trucks transportation to the
public road network; and
·
The Contractor should prepare a Waste
Management Plan (WMP) as part of the Environmental Management Plan (EMP) in
accordance with the PNAP ADV-19. The WMP should be submitted to the Project
Manager/ Representatives of project proponent for approval. Mitigation
measures proposed in the EIA Report and the EM&A Manual should be adopted.
Waste Reduction Measures
6.5.1.3
Amount of waste generation can be significantly reduced through
good management and control. Waste reduction is best achieved at the
planning and design phase, as well as by ensuring the implementation of good
site practices. The following
recommendations are proposed to achieve reduction:
·
Segregate and store different types of
waste in different containers, skip or stockpiles to enhance reuse or recycling
of materials and their proper disposal;
·
Proper storage and good site practices
to minimize the potential contamination of construction materials;
·
Plan and stock construction materials
carefully to minimize amount of waste generated and avoid unnecessary
generation of waste; and
·
Provide training to workers on the
importance of appropriate waste management procedures, including waste
reduction, reuse and recycling.
Storage, Collection and Transportation of Waste
6.5.1.4
Storage of waste on site may induce adverse environmental
implications if not properly managed. The following recommendation should be
implemented to minimize the impacts:
·
Non-inert C&D materials such
as top soil should be handled and stored well to ensure secure
containment of the materials;
·
Stockpiling area/ temporary stockpiling
area should be provided with covers and water spraying system to prevent
materials from wind-blown or being washed away; and
·
Different locations should be
designated to stockpile each material to enhance reuse.
6.5.1.5
The collection and transportation of waste from works areas to
respective disposal sites may also induce adverse environmental impacts if not
properly managed. The following recommendation should be implemented to
minimize the impacts:
·
Remove waste in timely manner;
·
Employ the trucks with cover or
enclosed containers for waste transportation;
·
Obtain relevant waste disposal permits
from the appropriate authorities;
·
Disposal of waste should be done at
licensed waste disposal facilities; and
·
In order to monitor the disposal of
C&D materials at PFRFs and landfills and to control fly-tipping, a
trip-ticket system should be established in accordance with DEVB TCW No.
6/2010. A recording system for the
amount of waste generated, recycled and disposed, including the disposal sites,
should also be set up. Warning
signs should be put up to remind the designated disposal sites. CCTV should be installed at the
vehicular entrance and exit of the site as additional measures to prevent
fly-tipping.
6.5.1.6
In addition to the above measures, other specific mitigation
measures on handling the C&D materials, marine sediment,
chemical waste and general refuse generated from construction phase
are recommended in the following sub-sections.
C&D Material
6.5.1.7
Wherever practicable, C&D materials should be segregated from
other wastes to avoid contamination and ensure acceptability at PFRFs areas or
reclamation sites. The following mitigation measures should be
implemented in handling the C&D materials:
·
Carry out on-site sorting;
·
Make provisions in the Contract
documents to allow and promote the use of recycled aggregates where
appropriate; and
·
Implement a trip-ticket system for each
works contract in accordance with DEVB TCW No. 06/2010 to ensure that the
disposal of C&D materials is properly documented.
·
Ensure that all dump trucks carrying
C&D materials to the designated locations are equipped with GPS or
equivalent devices so that the travel routes and parking locations can be
tracked and monitored. A real-time
GPS tracking system connecting to the internet or intranet will allow efficient
tracking and monitoring to avoid illegal dumping or landfilling of C&D
materials. The data collected by
GPS or equivalent system should be recorded properly for checking by
Environmental Team (ET) and Independent Environmental Checker (IEC) regularly.
6.5.1.8
Details of the recommended on-site sorting and reuse of C&D
materials are given below:
On-site Sorting of C&D Materials
·
Storage areas would be located within
the site during construction phase for temporary storage of inert C&D
materials.
·
All C&D materials arising from the
construction would be sorted on-site to recover the inert C&D materials and
reusable and recyclable materials prior to disposal off-site as far as
practicable. Non-inert portion of
C&D materials should also be reused whenever possible and be disposal of at
landfills as a last resort.
·
The Contractor would be responsible for
on-site sorting of C&D materials and promptly remove all sorted and
processed material arising from the construction activities to minimize
temporary stockpiling on-site.
Reuse of C&D Materials
6.5.1.9
The following potential measures should be explored to maximize
the reuse/ recycle of C&D materials generated from the Project:
·
Reuse suitable inert C&D materials
on-site as far as practicable;
·
Reuse suitable excavated rock by
reworking at approved quarries (e.g.
Crushed as aggregates);
·
Sorting of demolition debris and
excavated materials from demolition works to recover reusable/ recyclable
portions (e.g. Soil, broken
concrete, metal); and
·
Protect recyclable material to keep it
in usable condition.
Land-based and Marine-based Sediment
6.5.1.10
Excavated marine sediment should be reused as far as possible
within the Project Site before considering disposal. Subject to availability
of suitable location and review on the backfilling method, part or all of the
marine sediment would be reused on site. Possible methods for the reuse of marine
sediment on site including the reuse as backfilling materials after mixing with
cement should be explored. The
criteria for reuse of treated sediments are proposed with reference to the
Unconfined Compressive Strength (UCS) and the Universal Treatment Standards
(UTS), which specify the Toxicity Characteristics Leaching Procedure (TCLP)
test limits as given in Section 4.1 and Table 4.6 of the Practice Guide for
Investigation and Remediation of Contaminated Land. A pilot trial will be carried out for the
concerned sediments in order to confirm the treatment options. During the
cement stabilization / solidification (S/S) process, the below mitigation
measures shall be adopted to minimise the potential environmental impacts:
·
Cement mixing process should be enclosed
to minimize odour/ dust emissions.
·
Loading, unloading, handling,
transferring and storing for treated and untreated sediment should be carried
out with good site practices that prevents or minimizes dust emissions.
·
An impermeable surfacing shall be
placed under the mixing areas and a cover should be provided to prevent dust
emission and possible cross contamination.
·
Good housekeeping should be maintained
at the mixing and treatment area.
·
Treated and untreated sediments should
be clearly separated and stored separately.
·
Surface runoff from the mixing and
treatment areas should be properly collected and stored separately, and then
properly treated to levels in compliance with the relevant effluent standards
as required under the Water Pollution Control Ordinance before final discharge.
·
Prior to the cement mixing operation,
safety training and environmental training should be provided to all related
site staff and workers.
·
For the Cement S/S works, at least one
safety officer shall be provided by the Main Contractor to identify possible
hazards and ensure the implementation of all relevant safety measures.
·
Skilled and qualified personnel should
be employed to carry out the work and the plant operator must obtain valid
certificate to complete the job. The safety officer must ensure that sufficient
trainings will be provided to all workers with respect to the safety awareness
and safety precaution of work.
·
Backhoe / Excavator should be examined
by Registered Professional Engineer according to statutory requirements before
use. Only the plant operators with valid qualified certificates should be
allowed to operate the relevant plants.
·
All workers in site area should wear
appropriate personal protective equipment, such as safety helmet, safety shoes,
gloves, goggles and protective coveralls (if necessary). No person should
approach to the backhoe / excavator during their operation.
·
Workers, vehicles, instruments, and
equipment in touch with the marine sediment will be properly decontaminated by
cleaned with non-phosphate detergent and rinsed with distilled water between
each excavation and sampling event and before leaving the site.
·
The excavated area should be vacated
and fenced off and adequate warning signs should be displayed.
·
In order to minimize the duration of
contact between marine sediment and workers, excavation works should be done
within short period of time. No excavation should be held during the rainy days
to avoid the migration of contaminants on site.
·
Smoking, eating or drinking during
activities with exposure to the contaminated materials should be prohibited.
6.5.1.11
Marine disposal option for the marine sediment should only be
considered as the last resort upon exhaustion of reuse options. In case off-site disposal is unavoidable,
the possible mitigation measures to handle the sediment are summarized as
follows:
·
All construction plant and equipment
shall be designed and maintained to minimise the risk of sediments being
released into the water column or deposited in the locations other than
designated location.
·
All vessels should be sized so that
adequate clearance is maintained between vessels and the seabed in all tide
conditions, to minimise that undue turbidity is not generated by turbulence
from vessel movement or propeller wash.
·
Adequate freeboard shall be maintained
on barges to ensure that decks are not washed by wave action.
·
All marine sediments shall be
transported to the designated location by water-tight containers and dump
trucks with tarpaulin cover.
6.5.1.14
For those processes which generated chemical waste, it may be
possible to find alternatives to eliminate the use of chemicals, to reduce the
generation quantities or to select a chemical type of less impact on
environment, health and safety as far as possible. Wherever
possible, opportunities for the reuse and recycling of materials will be taken.
6.5.1.15
If chemical waste is produced at the construction site, the Contractor
should register with EPD as a chemical waste producer. Storage, handling, transport and
disposal of chemical waste should be arranged in accordance with the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes published
by the EPD. Chemical waste should be stored in appropriate containers and
collected by a licensed chemical waste collector. Chemical waste (e.g. Spent lubricant oil) should be recycled
at an appropriate facility as far as possible, while the chemical waste that
cannot be recycled should be disposed of at either the CWTC, or another
licensed facility, in accordance with the Waste Disposal (Chemical Waste)
(General) Regulation. Below
mitigation measures shall be adopted:
·
The containers used for storing
chemical waste should be suitable for the substance to be held, resistant to
corrosion, maintained in good conditions and securely closed;
·
The containers should have a capacity
of <450L unless the specifications have been approved by the EPD;
·
The label on the containers should be
clearly labelled in English and Chinese and comply with the requirements
prescribed in Schedule 2 of Waste Disposal (Chemical Waste) (General)
Regulation;
·
The storage area for the chemical waste
should be used solely for the storage of chemical wastes;
·
The storage area should be enclosed on
at least three sides by a wall, partition or fence with a height of not less
than two metres or the total height of containers in stack, whichever is less;
·
Where containers of liquid chemical
wastes are stored, the area should be designed with impermeable floor and provided
with a bund with capacity to accommodate 110% of the volume of the largest
container or 20% by volume of the chemical waste stored in the area, whichever
is greatest;
·
Adequate ventilation should be allowed
in the storage area by leaving some space between the top of the enclosure
walls and the ceiling, or provision of louvers on the sides of the enclosure
walls;
·
The storage area should be sufficiently
covered to prevent rainfall from entering the public drainage system via
storage area (water collected within the bund must be tested and disposed of as
chemical waste, if necessary);
·
Separate containers should be used for
packing different types of waste or waste arising from different sources and
process to minimise mixing of incompatible materials;
·
Drip tray should be provided to
chemical waste containers. The drip
tray should be clean up regularly.
Clean up should be done before foreseeable inclement weather such as
typhoon or heavy rain; and
·
Waste oils, chemicals or solvents shall
not be disposed of to drain.
General Refuse
6.5.1.16
General refuse should be stored in enclosed bins separately from C&D materials/
wastes and chemical wastes. Sufficient bins shall be provided for storage
of general refuse as required under the Public Cleansing and Prevention of Nuisances
Regulation. Recycling bins should
also be placed to encourage recycling. Preferably enclosed and covered
areas should be provided for general refuse collection and routine cleaning for
these areas should also be implemented to keep areas clean. A reputable
waste collector should be employed to remove general refuse on a regular basis and
disposed of to the nearest landfill or refuse transfer
station. Burning of refuse on construction sites is prohibited. Disposal of general refuse is recommended
before foreseeable inclement weather such as typhoon or heavy rain. Segregation and storage of different
types of waste should be promoted to facilitate the reuse and recycling of the
materials. Separately labelled bins
for the deposition of aluminium cans, paper and plastic bottles etc. Should be provided as far as
practicable. Arrangements should be
made with the recycling companies to collect the recycle waste as
required. It is expected that such arrangements would minimize
potential environmental impacts.
6.5.1.17
The Contractor should implement an education programme for workers
relating to avoiding, reducing, reusing and recycling general waste. Participation in a local collection
scheme should be considered by the Contractor to facilitate waste reduction.
Floating Refuse
6.5.1.18
Tool-box training shall be provided to site workers to ensure proper
site waste management and good site practice are implemented. Weekly inspection shall also be carried
out to ensure no floating refuse is found within the Project Area. If any refuse is accidentally trapped in
the marine waters within the Project Area, it will be collected by the
Contractor and recycled as far as possible, the remaining waste will be disposed
of as general refuse.
6.5.2
Operational Phase
Municipal Solid Waste (MSW)
6.5.2.1 Designated areas will
be assigned for proper storage and collection of MSW generated on site. Segregation of MSW will be conducted on
site to allow for maximisation of recycling
opportunities. It is recommended to
place clearly labelled recycling bins at designated locations which could be
accessed conveniently. A reputable
waste collector should be employed to remove MSW regularly to minimise potential impacts arising from storage and
collection of MSW.
Chemical
Waste
6.5.2.2 If chemical waste is
produced, AAHK or it’s operator(s) would be required to register with the EPD
as a Chemical Waste Producer(s).
The guidelines stated in the Code of Practice on the Packaging, Labelling
and Storage of Chemical Wastes should be followed in handling of chemical
waste.
6.5.2.3 Appropriate
containers with proper labels should be used for storage of chemical
wastes. Chemical wastes should be
collected and delivered to designated outlet by a licensed chemical waste
collector. Chemical waste shall be
disposed of at appropriate facility such as the CWTC by licensed collectors.
6.5.2.4 AAHK or it’s
operator(s) shall prepare an Emergency Response Plan (ERP) to prevent and
handle chemical spillages caused by the operations of depot during the
operational stage. The ERP shall
include the spill prevention and precaution, responses action and procedures
for spill clean up and disposal. If any spillage occurs, AAHK or it’s
operator(s) shall Inform Environmental Protection Department, Fire Services
Department and Police in the case where the spillage of chemicals would cause
serious contamination of an area or risk of pollution.
Floating
Refuse
6.5.2.5 Adequate rubbish bins
shall be provided at marine facilities and ATCL. Control measures such as regular
inspection and collection of floating refuse should be carried out. If any floating refuse is found within
the Project area, it will be collected and recycled as far as possible, the
remaining waste will be disposed of as general refuse.
Marine-based
Sediment during Maintenance Dredging
6.6.1.1
With the implementation of good site practice to properly store,
handle and dispose of the waste generated from the Project, no adverse residual
impact is anticipated during the construction and operational phases of the
Project.
6.7.1.1
During the construction period, it is the Contractor’s
responsibility to ensure that all waste produced during the construction of the
Project are handled, stored and disposed of in accordance with good waste
management practices, relevant legislation and waste management guidelines.
6.7.1.2
It is recommended that the waste arisings generated during the
construction activities should be audited 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.
6.7.1.3
During operation, with the implementation of good waste management
practices, no adverse environmental impact is anticipated, and therefore waste
monitoring and audit programme during the operational phase is not required.
6.8.1.1
During the construction phase, waste types generated from the
Project would likely include C&D materials (from foundation and
construction works of proposed ATCL), land-based and marine-based sediment, chemical
wastes from maintenance of construction plant and equipment, general refuse
from the workforce and floating refuse. The Contractor is requested to implement
recommendations to avoid and minimize waste generation and off-site disposal
during construction.
6.8.1.2
As the marine facilities is located between the Airport Island and
HKP Island, limited amount of refuse may be trapped along the shoreline at
marine facilities during heavy rains or typhoons. Given that the Project would
implementation of appropriate control measures during construction and
operational phase, it is considered that the future quantity of refuse to be
found within the Project are would be similar to the existing situation.
6.8.1.3
During construction phase, approximate 2,803m3 land-based
and marine-based sediment will be excavated from the Project. Total 2,270m3 and 533m3 marine
sediment classified as Type 1- Open Sea Disposal and Type 1- Open Sea Disposal
(Dedicated Sites) respectively. No
adverse environment impacts would be expected from the excavation, treatment,
transportation and disposal of marine sediment.
6.8.1.4 During the
operational phase, the main waste types generated would be chemical waste, MSW
from maintenance activities and staff and passengers, floating refuse and
marine sediment from maintenance dredging at marine facilities. Maximum 35,000m3 of
marine-based sediment will be dredged every 2 years from
the maintenance dredging. Requirements and procedures for dredged/excavated
sediment specified under the PNAP ADV-21 should be followed. It is anticipated that no adverse
impacts would arise if the mitigation measures were implemented.