Table of Contents
1 Introduction
1
1.1 Background
Information 1
1.2 Policy 2
1.3 EM&A
Programme Objectives 2
1.4 Scope
of the EM&A Programme 3
1.5 Project
Organization 5
1.6 Terminology 7
2 PROJECT
DESCRIPTION
9
2.1 Scope
of the Project 9
2.2 Northern
Section in Tuen Mun 9
2.3 Submarine
Tunnel (not used) 11
2.4 Southern
Section at HKBCR/ North Lantau (not used) 11
2.5 Works
Areas 11
2.6 Sewage
and Drainage 12
2.7 Project
Programme 13
2.8 Concurrent
Projects 13
2.9 Traffic
Data and Assumptions 14
3 AIR
QUALITY
15
3.1 Air
Quality Parameters 15
3.2 Monitoring
Equipment 15
3.3 Laboratory
Measurement/Analysis 16
3.4 Monitoring
Locations 17
3.5 Baseline
Monitoring 18
3.6 Impact
Monitoring 18
3.7 Event
and Action Plan for Air Quality 20
3.8 Dust
Mitigation Measures 20
4 NOISE
23
4.1 Introduction 23
4.2 Noise
Parameters (not used) 23
4.3 Monitoring
Equipment (not used) 23
4.4 Monitoring
Locations (not used) 23
4.5 Baseline
Monitoring (not used) 23
4.6 Construction
Phase Impact Monitoring (not used) 23
4.7 Event
and Action Plan for Construction Noise (not used) 23
4.8 Noise
Mitigation Measures 23
5 WATER
QUALITY
24
5.1 Introduction 24
5.2 Mitigation
Measures 24
5.3 Water
Quality Parameters (Not used) 25
5.4 Monitoring
Equipment (Not used) 25
5.5 Laboratory
Measurement / Analysis (Not used) 25
5.6 Monitoring
Locations (Not used) 25
5.7 Baseline
Monitoring for Water Quality (Not used) 25
5.8 Efficiency
of Silt Curtains (Not used) 25
5.9 Impact
Monitoring for Water Quality (Not used) 25
5.10 Post-construction
Monitoring (Not used) 25
5.11 Operational
Phase Monitoring (Not used) 25
5.12 Event
and Action Plan(Not used) 25
6 ECOLOGY
26
6.1 Introduction 26
6.2 Ecology
EM&A Procedures 26
6.3 Design
Phase Audit 26
6.4 Baseline
Monitoring 27
6.5 Construction
and Operational Phase EM&A 28
6.6 Mitigation
and Enhancement Measures 29
7 LANDSCAPE
AND VISUAL ASSESSMENT
30
7.1 Introduction 30
7.2 Relevant
Legislation 30
7.3 Methodology
and Criteria 30
7.4 Baseline
Monitoring 32
7.5 Event
and Action Plan 32
7.6 Mitigation
Measures 32
8 WASTE
MANAGEMENT AND CONTAMINATED LAND
35
8.1 Waste
Issues 35
8.2 Contaminated
Land 39
8.3 Waste
EM&A Requirements 39
9 CULTURAL
HERITAGE
42
9.1 Introduction 42
9.2 Mitigation
Measures 42
9.3 Design
Phase Audit 42
9.4 Baseline
Monitoring 43
9.5 Construction
Phase Audit 43
10 Landfill Gas Hazard Assessment
45
10.1 Introduction 45
10.2 Monitoring
and Measurement of Landfill Gas 45
11 SITE
ENVIRONMENTAL AUDIT
47
11.1 Site
Inspections 47
11.2 Compliance
with Legal and Contractual Requirements 48
11.3 Environmental
Complaints 48
11.4 Choice
of Construction Method 49
12 REPORTING
50
12.1 General 50
12.2 Documentation 50
12.3 Design
Audit Report 50
12.4 Baseline
Monitoring Report 50
12.5 EM&A
Reports 51
12.6 First
EM&A Report 51
12.7 Subsequent
EM&A Reports 53
12.8 Quarterly
EM&A Summary Reports 54
12.9 Annual/Final
EM&A Review Reports 54
12.10 Data
Keeping 56
12.11 Interim
Notifications of Environmental Quality Limit Exceedances 56
List of Figures
Figure 1.1 Design
Phase EM&A Procedure and Organization
Figure 1.2 Construction
and Operational Phase Procedure and Organization
Figure 2.1 General
Layout of TM-CLKL
Figure 2.2a layout plan of northern landf all
Figure 2.2b layout plan of southern landf all
Figure 2.4a Northern
Viaduct Connection, Slip Roads and Toll Plaza
Figure 2.4b Traffic
Flows at Toll Plaza
Figure 2.4c Layout
Plan of Contract HY/2013/12 ((Sheet 1 of 3)
Figure 2.4d Layout
Plan of Contract HY/2013/12 ((Sheet 2 of 3)
Figure 2.4e Layout
Plan of Contract HY/2013/12 ((Sheet 2 of 3)
Figure 2.4f 250m
Consultation Zone of PPV Landfill
Figure 2.8a Proposed
Works Areas for TM-CLKL (Tuen Mun Side)
Figure 2.8b Proposed
Works Areas for TM-CLKL (Lantau Side)
Figure 2.9a Indicative
Construction Programme in Tuen Mun
Figure 2.9c Portions
of Works in Tuen Mun
Figure 3.1 Data
Sheet for TSP Monitoring
Figure 3.2a Air
quality Monitoring Station under the contract
Figure 6.1 Construction
Phase Ecological EM&A Procedure
Figure 7.1.1.1 Baseline
Landscape Resources with Development Proposal Overlaid (Sheet 1 of 5)
Figure 7.1.1.2 Baseline
Landscape Resources with Development Proposal Overlaid (Sheet 2 of 5)
Figure 7.2.1.1 Baseline
Landscape Character Areas with Development Proposal Overlaid (Sheet 1 of 5)
Figure 7.2.1.2 Baseline
Landscape Character Areas with Development Proposal Overlaid (Sheet 2 of 5)
Figure 7.3.1.1 Baseline
Key VSRs and Viewpoint at Local Level with Development Proposal Overlaid During
Construction (Sheet 1 of 2)
Figure 7.3.1.3 Baseline
Key VSRs and Viewpoint at Local Level with Development Proposal Overlaid During
Operation (Sheet 1 of 2)
Figure 7.3.2.1 Baseline
Key VSRs Viewpoints at Strategic and District Level with Development Proposal
Overlaid
Figure 9.1 Retaining
Walls Arrangement at Existing Grave
Figure 12.1 A
sample template for the interim notifications
List of TABLES
Table
1.1 Summary of EM&A Requirements
Table
2.1 Proposed Tolling
Arrangements at Toll Plaza
Table
2.2 Details of
TM-CLKL Proposed Works Areas
Table
2.3 Estimated Sewage
Generation
Table
3.1 Air Quality
Monitoring Station under the Contract
Table
3.2 Enhanced TSP
Monitoring Plan – Construction Phase
Table
3.3 Action and Limit
Levels for Air Quality
Table
3.3a TSP Action and Limit Levels for
Impact Air Quality Monitoring
Table
3.4 Event / Action Plan for Air Quality
Table
6.1 Ecological
Design Specifications
Table
6.2 Event / Action Plan for Design Phase
Table
6.3 Event / Action Plan for General Ecology
Table
7.1 Monitoring
Programme
Table
7.2 Event and Action Plan for Landscape and
Visual Impact
Table
8.1 Estimated
quantities of C&D materials and waste from Contract No. HY/2013/12
Table
8.2 Recommended
Waste Disposal Sites
Table
8.2 Waste Management Checklist
Table
8.3 Waste Management Checklist
Table
9.1 Event / Action Plan for Design Phase
Table
9.2 Event / Action Plan for Construction Phase
Table 10.1 Actions
in the Event of Landfill Gas being Detected in Excavation / Confined Area
List of Appendices
Appendix
A Environmental
Mitigation Implementation Schedules
Appendix B Environmental
Proformas
Appendix C Summary of
Changes for Contract Specific EM&A Manual
1.1.1.1
According to the findings of the Northwest
New Territories (NWNT) Traffic and Infrastructure Review conducted by the
Transport Department, Tuen Mun Road, Ting Kau Bridge,
Lantau Link and North Lantau Highway (NLH) will be operating beyond capacity
after 2016 due to the increase in cross boundary traffic, developments in the
NWNT, and possible developments in North Lantau, including the Airport
developments, the Lantau Logistics Park (LLP) and the Hong Kong – Zhuhai –
Macao Bridge (HZMB). In order to cope with the anticipated traffic demand, two
new connections between NWNT and North Lantau – Tuen Mun – Chek
Lap Kok Link (TM-CLKL) and Tuen Mun Western Bypass (TMWB) are proposed.
1.1.1.2
The proposed TM-CLKL if combined with the
TMWB will provide a direct route linking NWNT and North Lantau, from north to
south, the Kong Sham Western Highway (KSWH), port back-up areas in NWNT, Tuen
Mun River Trade Terminal, the existing EcoPark in
Tuen Mun Area 38, the Airport, the proposed LLP, HZMB and North Lantau
developments. The new connection will significantly reduce the travelling time
between the KSWH and the NWNT region at its northern side, and North Lantau at
its southern side.
1.1.1.3
In 2005, Highways Department (HyD)
commissioned an engineering feasibility study (FS), namely Tuen Mun Chek Lap Kok Link and Tuen Mun Western Bypass – Feasibility
Study (Agreement No. CE 28/2005 (HY)), to evaluate the technical feasibility
and impacts of the Project. The FS
recommended that the TM-CLKL should be a dual 2-lane road with a total length
of about 9 km with about 4 km long submarine tunnel and 5 km long elevated
structure.
1.1.1.4
In order to progress this project, Maunsell
Consultants Asia Ltd. were appointed by HyD to carry
out the Assignment on Tuen Mun – Chek Lap Kok Link - Investigation
under Agreement No. CE 52/2007 (HY). The Assignment commenced on 19 May 2008
and shall be completed within 24 months, i.e. by mid-May 2010.
1.1.1.5
The Feasibility Study initially proposed an alignment of
the TM-CLKL comprising a toll plaza island at Tai Mo To and this alignment
formed the basis of the EIA Study Brief (ESB 175/2007). However, subsequent to
these documents being prepared and based upon the proposed schemes for the Hong
Kong-Zhuhai-Macao Bridge (HZMB) and Hong Kong Boundary Crossing Facilities
(HKBCF), it was decided to integrate the TM-CLKL southern landfall reclamation
with the HKBCF reclamation. It was considered that this arrangement would also
provide a cost-effective connection between the HKBCF and North Lantau.
Following a full option assessment, the preferred scheme was selected, as
detailed in Section 2 of this EM&A Manual.
1.1.1.6
The project is a designated project under Section A.1 of
Schedule 2 of the Environmental Impact Assessment Ordinance (EIAO). As such,
the statutory procedures under the EIAO need to be followed and an
environmental permit (EP) will be required prior to the commencement of
construction. Thus, as part of this assignment, an Environmental Impact
Assessment (EIA) has been undertaken.
1.1.1.7
The EIA for the project has recommended comprehensive
Environmental Monitoring and Audit requirements to be undertaken during the
design, construction and operational stages of the project. This Report
constitutes the Environmental Monitoring and Audit (EM&A) Manual for the
proposed Tuen Mun - Chek Lap Kok Link (TM-CLKL)
Project, providing details of the EM&A recommendations.
1.1.1.8
The Hong Kong SAR Government’s applicable environmental
regulations for noise, air quality, ecology, water quality, landscape and
visual resources and waste management and heritage protection, the Hong Kong
Planning Standards and Guidelines and recommendations in the TM-CLKL EIA Report
have served as guidance documents in the preparation of this Manual. This
EM&A Manual fulfills the requirements of the Study Agreement and follows
the approach recommended in EPD’s Generic EM&A Manual, Annex 21 of the
Technical Memorandum on the EIA Process and EM&A Guidelines for Development
Projects in Hong Kong.
1.2.1.1
The Engineer’s Representative (ER) and the Contractor
shall adopt Environmental Policy Statements in accordance with the requirements
of this Manual in order to foster a sound EM&A programme to protect the
environment. The following policy statements shall be adopted:
Ÿ
establish a commitment to environmental excellence in all
activities arising from the development project;
Ÿ
encourage the adoption of environmental management
principles to prevent potential impacts and minimize adverse impacts; and
Ÿ
commit to the
recommendations in the EIA study report and related EIA process requirements.
1.3.1.1
The broad objective of this EM&A Manual is to define
the procedures of the EM&A programme for monitoring the environmental
performance of the TM-CLKL project during design, construction and
implementation.
1.3.1.2
The manual provides details of the environmental
monitoring requirements arising from the EIA including air, noise and water
quality, as well as audit recommendations for the noise, air, water quality,
ecology, landscape and visual, waste and cultural heritage. The purposes of the
defined EM&A programme are as follows:
Ÿ
to ensure the specified mitigation recommendations of the
EIA are included in the design of the project;
Ÿ
to clarify and identify
sources of pollution, impact and nuisance arising from the works;
Ÿ
to confirm compliance
with legal, contract specifications and EIA study recommendations;
Ÿ
to provide an early
warning system for impact prevention;
Ÿ
to provide a database of
environmental parameters against which to determine any short term or long term
environmental impacts;
Ÿ
to propose timely,
cost-effective and viable solutions to actual or potential environmental
issues;
Ÿ
to monitor performance
of the mitigation measures and to assess their effectiveness and, whenever necessary,
identify any further need for additional measures;
Ÿ
to verify the EIA
predicted impacts;
Ÿ
to collate information
and evidence for use in public, District Council and Government consultation;
and
Ÿ
to audit environmental
performance.
1.3.1.3
EM&A procedures are
required during the design, construction and operational phases of the project
implementation and a summary of the requirements for each of the environmental
parameters is detailed in Table 1.1
below.
Table 1.1 Summary of EM&A
Requirements
|
Parameter
|
EM&A Phase
|
|
Design
|
Construction Phase
|
Operational Phase
|
|
Air Quality
|
|
Y
|
|
|
Noise
|
Not relevant to the Northern
Connection Toll Plaza and Associated Works since there is no noise
sensitive receiver identified for the Project area at Tuen Mun.
|
|
Ecology
|
Y
|
Y
|
Y
|
|
Water Quality
|
The major construction activity
of Northern Connection Toll Plaza and Associated Works is land based and no
water quality monitoring is therefore required.
|
|
Landscape and Visual
|
Y
|
Y
|
Y
|
|
Waste/Contaminated Land
|
|
Y
|
|
|
Cultural Heritage
|
Y
|
Y
|
|
Remarks:
Y = Yes
1.4.1.1
The scope of the EM&A programme is to undertake the
following:
a.)
Implement monitoring and audit activities for each
environmental parameter as follows:
|
Dust:
|
i.
Establish
baseline dust levels at specified locations and review
these levels on a regular basis.
ii. Implement construction dust impact monitoring
programme.
|
|
Noise:
|
i.
Not relevant to Toll Plaza.
|
|
Ecology:
|
i.
Implement design
phase audit for integrated ecological mitigation measures.
ii. Implement baseline survey to establish existing ecological
conditions.
iii. Implement construction phase monitoring and audit
requirements for ecology resources.
iv. Implement operational phase monitoring.
|
|
Water Quality:
|
i.
Not relevant to Toll Plaza.
|
|
Landscape and
Visual:
|
i.
Design detailed
landscape specifications.
ii. Implement baseline survey to establish/confirm existing
landscape and visual conditions.
iii. Implement construction phase audit requirements for
landscape and visual resources.
iv. Implement operational phase audit requirements for
landscape and visual aspects.
|
|
Waste:
|
i.
Implement
construction phase audit requirements for waste aspects.
|
|
Heritage:
|
i.
Implement design
phase audit for toll plaza design to ensure set back from grave as been integrated.
ii. Implement walkover survey to confirm existing conditions.
iii. Implement construction phase audit requirements for
historical resources.
|
b.)
Liaison and provision of advice to construction site
staff on the purposes and implementation of the EM&A programme.
c.)
Identify and resolve environmental issues that may arise
from the project.
d.)
Check and quantify the Contractor’s overall performance,
implement Event/Action Plans and recommend and implement remedial actions to mitigate
adverse environmental effects as identified by the EM&A programme and EIA.
e.)
Conduct monthly reviews of monitored impact data during
the construction phase and bi-monthly reviews during the operational phase as the
basis for assessing compliance with defined criteria and ensuring that necessary
mitigation measures are identified, designed and implemented and to undertake
additional ad hoc monitoring and audit as required by particular circumstances.
f.)
Evaluate and interpret all environmental monitoring data
to provide an early indication should any of the environmental control measures
or practices fail to achieve the acceptable standards and to verify the environmental
impacts predicted in the EIA.
g.)
Manage and liaise with other individuals or parties
concerning any relevant environmental issues.
h.)
Audit the effectiveness of the Environmental Management
System (EMS) practices and procedures and implement any changes as appropriate.
i.)
Conduct regular site audits of formal or informal nature
to assess:
-
the level of the Contractor’s general environmental
awareness;
-
the Contractor’s implementation of the recommendations in
the EIA;
-
the Contractor’s performance as measured by the EM&A;
-
the need for specific mitigation measures to be
implemented or the continued usage of those previously agreed; and
-
to advise the
site staff of any identified potential environmental issues.
j.)
Submit EM&A reports which summaries project
monitoring and auditing data, with full interpretation, illustrating the
acceptability or otherwise of any environmental impacts and identification or
assessment of the implementation status of agreed mitigation measures.
1.4.1.2
Thus, this EM&A Manual provides the following
information:
a.)
Description of the project.
b.)
Identification and recommendations for monitoring
requirements for all phases of development, including:
-
identification of sensitive receivers;
-
monitoring locations;
-
monitoring parameters and frequencies;
-
monitoring equipment to be used;
-
programmes for baseline
monitoring and impact monitoring; and
-
data management
of monitoring results.
c.)
The organization management structure and procedures for
auditing of the Project and implementation of mitigation measures that are
recommended for the Project.
d.)
The environmental quality performance limits for
compliance auditing for each of the recommended monitoring parameters to ensure
compliance with relevant environmental quality objectives, statutory or
planning standards.
e.)
Organization and management structure, and procedures for
reviewing the design submissions, monitoring results and auditing the
compliance of the monitoring data with the environmental quality performance limits,
contractual and regulatory requirements, and environmental policies and standards.
f.)
Event and Action plans for impact and compliance
procedures.
g.)
Complaints handling, liaison and consultation procedures.
h.)
Interim notification of exceedances, reporting procedures,
report formats and reporting frequency including periodical quarterly summary
reports and annual reviews to cover all construction, post-Project and
operational phases of the development.
i.)
Implementation schedules, summarizing all recommended mitigation
measures.
1.4.1.3
This Manual is considered to be a working document and
should be reviewed periodically and revised once substantial changes have been
made.
1.5.1.1
For the purpose of this EM&A
Manual, the Highways Department of the Hong Kong SAR Government is referred to
as the “Employer” and the Project “Engineer” defined as the Engineer’s
Representative (ER), who will be responsible for the supervision of the
construction of the Project.
1.5.1.2
The mitigation/enhancement measures recommended by the
TM-CLKL EIA that will require a design audit or preparation of specifications
during the detailed design phase of the project will include:
Ÿ
installation of hoarding
for the protection of the pitcher plants and surrounding habitat;
Ÿ
design of toll plaza for
grave G1 set back and protection; and
Ÿ landscape design drawings.
1.5.1.3
In respect of the design phase EM&A, the Consultant
commissioned to undertake the Detailed Design contract will be required to
designate an auditor(s) to undertake the preparation of the design
specifications as detailed above, in addition to an environmental audit of the
design of the specified landscape measures in order to ensure that the
recommendations of the EIA have been fully and properly specified. The
Consultant shall use suitably qualified staff to undertake the audit
requirements to the satisfaction of the EPD and the AFCD as appropriate. A flow
chart of the design phase EM&A procedures is shown in Figure 1.1.
1.5.1.4
During the construction and operational phases of the
project, an Environmental Team (ET) is to be employed by the Contractor. The ET will be headed by an Environmental
Team Leader (ETL). He shall ensure the Contractor’s compliance with the
project’s environmental performance requirements during construction and undertake
the post construction EM&A works and his responsibilities will include
field measurements, sampling, analysis of monitoring
results, reporting and auditing. The ETL shall be approved by the ER and the
Director of Environmental Protection (DEP) and shall be competent and shall
have at least 7 years relevant environmental monitoring and audit experience on
projects of a similar scale and nature.
1.5.1.5
The ET will comprise suitably qualified
support staff to carrying out the EM&A programme. The ET shall be independent
and shall not be in any way connected to the Contractor’s company. Due to the
specialist nature of some of the EM&A works required for this project, the
ET should comprise professionals proficient to undertake the tasks involved. Thus, the ET should include personnel
experienced in dust monitoring and mitigation, supervision of waste management
and compensatory tree planting.
1.5.1.6
Accordingly, a Registered Landscape
Architect, as defined by the Landscape Architect’s Registration Board, will be
required on the ET to monitor and audit the landscaping installation works and
assist in the audit of the ecological transplantation and restoration works.
1.5.1.7
The overall duties of ETL and the team are as follows:
Ÿ
Sampling, analysis and statistical evaluation of monitoring
parameters with reference to the EIA study recommendations and requirements in respect
of noise, dust and water quality.
Ÿ
Environmental site surveillance.
Ÿ
Audit of compliance with
environmental protection and pollution prevention and control regulations.
Ÿ
Monitor the
implementation of environmental mitigation measures.
Ÿ
Monitor compliance with
the environmental protection clauses/specifications in the Contract.
Ÿ
Review construction
programme and comment as necessary.
Ÿ
Review construction
methodology and comment as necessary.
Ÿ
Complaint investigation,
evaluation and identification of corrective measures.
Ÿ
Audit of the EMS and
recommend and implement any changes as appropriate.
Ÿ
Liaison with the
Independent Environmental Checker IEC) on all environmental performance
matters.
Ÿ
Advice to the Contractor
on environmental improvement, awareness, enhancement matter, etc., on site.
Ÿ
Timely submission of the
designated EM&A reports to the ER, the IEC, the DEP, the AFCD and the AMO
as appropriate.
1.5.1.8
In addition to the ETL and ET, an Independent
Environmental Checker (IEC) shall be employed to advise the ER on environmental
issues related to the project. The
role of the IEC shall be independent from the management of construction works,
but the IEC shall be empowered to audit the environmental performance of the
construction activities and operational mitigation. The IEC shall have project management
experience in addition to the requirements of the ET specified above and the
appointment of the IEC will be subject to the approval of the ER and the DEP. The IEC may require specialist support
staff in order to properly carry out his duties, which shall include the
following:
Ÿ
Review and audit all aspects of the EM&A programme.
Ÿ
Validate and confirm the accuracy of monitoring results,
monitoring equipment, monitoring locations, monitoring procedures and locations
of sensitive receivers.
Ÿ
Carry out random sample check and audit on monitoring
data and sampling procedures, etc.
Ÿ
Conduct random site inspection.
Ÿ
Audit the EIA recommendations and requirements against
the status of implementation of environmental protection measures on site.
Ÿ
Review the effectiveness of environmental mitigation
measures and project environmental performance.
Ÿ
Audit the Contractor’s construction methodology and agree
the least impact alternative in consultation with the ET and the Contractor.
Ÿ Check
complaint cases and the effectiveness of corrective measures.
Ÿ
Review EM&A report
submitted by the ET.
Ÿ
Feedback audit results
to ET by signing off relevant EM&A proformas.
1.5.1.9
An organization chart
showing the lines of communication between the key parties with respect to the
EM&A works is provided on Figure
1.2. Both the ET and IEC shall be retained for the duration of the
EM&A works which will span both the construction phase and one year into
the operational phase of the project.
The operational EM&A works will be the responsibility of the
Contractor and will be undertaken in parallel to the maintenance period after
the completion of construction.
1.5.1.10
Notwithstanding the
above, given that the TM-CLKL, HKBCF and HKLR will be constructed concurrently,
an Environmental Protection Office (ENPO) or equivalent to oversee the
cumulative construction projects in North Lantau area will be established by
the Project Proponent. The responsibility of the ENPO would be similar to that
of the IEC but should also include:
Ÿ
coordination of the
monitoring and auditing works for all the on-going projects in the area in
order to identify possible sources/causes of exceedances and recommend suitable
remedial actions where appropriate;
Ÿ
identify and assess
cumulative impacts including possible sources/causes of exceedance and
recommending suitable remedial actions;
Ÿ
undertake liaison with
the mainland project teams counterparts to identify and assess any
cross-boundary cumulative impacts; and
Ÿ
coordinate the assessment and
response to complaints/enquires from locals, green groups, district councils or
the public at large.
1.5.1.11
The exact
responsibilities and organization of the ENPO will be defined during the detailed
design stage.
1.6.1.1
To clarify the terminology for impact monitoring and
audit, key definitions are specified below and are used throughout this Manual.
1.6.1.2
Monitoring refers to the systematic collection of data
through a series of repetitive measurements. The stages of monitoring are
defined in this document as follows:
a.)
Baseline Monitoring refers to the measurement of air
quality parameter during a representative pre-project period for the purpose of
determining the nature and ranges of natural variation and to establish, where
appropriate, the nature of change.
b.)
Impact Monitoring involves the air quality measurement of
environmental parameter, during Project construction and implementation so as
to detect changes in the parameter which can be attributed to the Project.
1.6.1.3
Audit is a term that infers the verification of a
practice and certification of data.
The types of audit are defined below:
a.)
Compliance audit
is defined as follows:
Ÿ
the process of
verification that all or selected parameters measured by a noise or air quality
impact monitoring programme or levels of an operation are in compliance with
regulatory requirements and internal policies and standards; and
Ÿ
the determination of
the degree and scope of any necessary remediation in the event of exceedance of
compliance.
b.)
Post Project Audit
is carried out after the implementation and commissioning of a Project.
1.6.1.4
For the purpose of
air impact monitoring and audit, the Action and Limit Levels are defined as
follows:
a.)
The Action Level
is the level defined in which there is an indication of a deteriorating ambient
level for which a typical response could be an increase in the monitoring
frequency.
b.)
The Limit Level is
the level beyond the appropriate remedial pollution control ordinances, air quality
objectives or Hong Kong Planning Standards and Guidelines established by the
EPD for a particular project, such that the works should not proceed without
appropriate remedial action, including a critical review of plant and work
methods.
2.1.1.1
Further to the recommendations of the Option Assessment
and subsequent alignment developments detailed in Section 2 of the EIA report,
the preferred TM-CLKL scheme comprises Northern Connection Option N1b, Main
Connection Option M3 and Southern Connection Option S1. This preferred
alignment is shown in Figure 2.1 and
will comprise:
(a)
construction of approximately 5.0km long dual 2-lane road
tunnel between Tuen Mun Area 40 and the HZMB HKBCF at north-east of HKIA;
(b)
construction of approximately 4.2km seawalls and
approximately 35.6ha of reclamation to the Government foreshore and sea-bed at
Tuen Mun Area 40 and Lantau for the tunnel portals and the associated roads, as
shown in Figures 2.2a and 2.2b;
(c)
construction of approximately 1.6km long dual 2-lane
viaduct between HZMB HKBCF and NLH and the associated roads at Tai Ho;
(d)
construction of a toll plaza at Tuen Mun Area 46 and the
associated roads at Tuen Mun;
(e)
construction of footpaths areas;
(f)
construction of administration building, ventilation
buildings and other ancillary buildings to facilitate ventilation and tunnel
control operation serving the proposed road tunnel in (a) above and toll plaza
in (d) above;
(g)
modification and realignment of sections of Lung Fu Road
and Lung Mun Road at Tuen Mun;
(h)
modification and realignment of sections of North Lantau
Highway and Cheung Tung Road at Tai Ho;
(i)
permanent closure and demolition of sections of existing
at-grade carriageways, footpaths and central median/refuge islands;
(j)
temporary closure and reconstruction/modifications of
sections of existing at-grade carriageways, footpaths and central median/refuge
islands; and
(k)
ancillary works
including site formation, slope, drainage, utilities, footbridge, noise
barriers, retaining walls, berths and temporary pontoon.
2.1.1.2
Details of the various elements of the selected TM-CLKL
alignment are detailed in the sections below.
2.2.3.1
A toll plaza at Tuen Mun Area 46 is proposed for the
TM-CLKL, as shown in detail in Figures 2.4a
to 2.4e. The toll
plaza is also considered as a co-location to accommodate the tolling provision
for the interface project, TMWB. In order to facilitate the tunnel operator(s)
applying different toll levels to TM-CLKL and TMWB road users, the following 3
separate groups of toll booths are proposed to be provided at the toll plaza:
Ÿ travelling
from/to TM-CLKL only;
Ÿ travelling
from/to TMWB only; and
Ÿ travelling from/to both TM-CLKL and TMWB.
2.2.3.2
The proposed toll plaza is approximately 190m x 680m in
size, with tunnel operation facilities located at the northern side of the
site. With reference to the latest traffic forecast at year 2031, the required
number of tolling lanes for different travelling trips are summarised
in Table 2.1 below:
Table 2.1 Proposed
Tolling Arrangements at Toll Plaza
|
Travelling Trip
|
Northbound
|
Southbound
|
Sub-total
|
|
Auto-toll Lane
|
Manual-toll Lane
|
Auto-toll Lane
|
Manual-toll Lane
|
|
TM-CLKL only
|
2
|
2
|
2
|
2
|
8
|
|
TMWB only
|
2
|
2
|
2
|
2
|
8
|
|
Both TM-CLKL & TMWB
|
2
|
2
|
2
|
3
|
9
|
|
Total:
|
|
25
|
2.2.3.3
The nearside tolling lane for each direction is proposed
to be 6.2m wide, for the passage of exceptionally wide vehicles and special
vehicles such as tunnel operator’s vehicles or other authorized vehicles. The
other tolling lanes are proposed to be 3.65m wide in order to allow the
flexibility of switching between manual-toll and auto-toll if necessary. A 1.6m
wide physical island will be provided to accommodate the toll booth, the access
staircase landing and the concrete median barriers.
2.2.3.4
The following facilities are required at the toll plaza
area for tunnel operations:
Ÿ
an administration building which could cater for 2 tunnel
operators (including individual workshops, garage and maintenance buildings);
Ÿ
a weigh station;
Ÿ
a vehicle recovery area;
Ÿ
turnaround facilities;
Ÿ
vehicle cross-over area;
Ÿ
a petrol filling station;
Ÿ
bus lay-bys with footbridge links; and
Ÿ
parking spaces for
employees, visitors, recovery, operation and maintenance vehicles.
2.2.3.5
The southwest end of the toll plaza will connect with
both northbound and southbound of the TM-CLKL. In order to tie in with the lane
configuration of TM-CLKL, both 3-lane and 2-lane carriageways will be provided
at the toll plaza for TM-CLKL northbound and southbound traffic respectively.
Roads connecting traffic heading to or coming from the TMWB will, also, be
provided between the toll plaza and TMWB tunnel portal.
2.2.3.6
A dual single-lane carriageway linking the proposed
enlarged roundabout at the junction of Lung Mun Road / Mong
Tat Street and the TMWB mainline tunnel will be provided in between the
northbound and southbound carriageways of the TM-CLKL.
2.2.3.7
Traffic from the Tuen Mun south road network destined for
TM-CLKL will use the approach single carriageway slip road branching from the
proposed roundabout at Lung Mun Road and Lung Fu Road. The traffic from TM-CLKL
leading to the Tuen Mun south road network will use the exit slip road after leaving
the toll booth. The slip road, which takes the form of a single carriageway tunnel,
will connect with the proposed roundabout at Lung Mun Road and Lung Fu Road.
2.2.3.8
An internal 7.3m wide 2-way service road providing the
turnaround service route around the portal area will also be provided, with a
2.0m wide footpath provided on one side of the road. An ingress/egress is
proposed at both ends of the toll plaza to allow for access of tunnel
operation, recovery and emergency vehicles.
2.2.3.9
The toll plaza will be formed as a raised platform above
the general existing ground. It will be partly constructed on fill supported by
retaining walls, and partly constructed on elevated structures. Cut slopes will
also be required, which will mostly be along the northern edge of the toll
plaza, with some isolated ones associated with the formation of the various
slip roads connecting the toll plaza to the local roads in Tuen Mun. The
excavated materials from the cut slopes will be re-used for the filling as part
of the earthwork balancing exercise.
2.2.3.10
In order to cope with the proposed layout of the toll
plaza, the existing Lung Mun Road will have to be realigned sideway to the
south by about 30m to suit. An alternative option of providing a decking
support for the portion of the toll plaza overhanging the existing Lung Mun
Road has, also, been considered as viable.
2.2.3.11
The current layout of the toll plaza, on the basis of
co-locating the tolling provision for both the TM-CLKL and TMWB, represents the
worst cases scenario for the EIA purposes in so far as the scale and extent of
works are concerned, as the combined toll plaza requires a larger land take
than a single, TM-CLKL only, toll plaza. The option remain, however, to
separate the tolling facilities and/or to adopt “non-tolling” for TMWB, which
could result in a “single” toll plaza of a smaller scale.
2.2.3.12
As described in Section 1 and 2, the EIA
Study Brief (ESB 175/2007), was based upon a toll plaza being located on either
the northern or southern landfall reclamation and, therefore, did not interface
with the 250m Consultation Zone of the Pillar Point Valley Landfill and,
therefore, no specific requirements for a landfill gas hazard assessment were
included in the EIA Study Brief. However, as shown in Figures 2.4f, the proposed location of the combined toll plaza
will encroach into the 250m consultation zone of the Pillar Point Valley
Landfill and, as such, could be affected by the migration of landfill gas.
Notwithstanding the scope of the EIA Study Brief, this issue should be assessed
as part of the EIA and, therefore, a Landfill Gas Hazard Assessment has been
undertaken as part of this Assignment.
2.2.4.1
Site formation and associated slopes and retaining walls
will be required to form the toll plaza and associated road carriageways. In
general, soil and rock cut slopes would be involved. All slopes will be formed
in a stable slope angle with proper maintenance access and drainage surface
channels. If necessary, soil nails will be installed to ensure adequate current
safety standard. Fill slope formation will unlikely be required according to
the current road alignment. The feasible retaining wall structures could be
mass concrete, reinforced concrete L-shape or crib walls and reinforced earth
for road embankment.
2.5.1.1
Six works areas have been identified for use during the
construction period of TM-CLKL, and will be used for locating site offices and
for storage of materials and viaduct segments, etc. The locations of the works
areas are shown in Figures 2.8a and 2.8b
and described in Table 2.2
below.
Table 2.2 Details
of TM-CLKL Proposed Works Areas
|
Works Area
|
Location
|
Proposed Use
|
|
Lantau #
|
|
WA4
|
At the existing reclaimed land near Tai Ho Offtake and Pigging Station at Cheung Tung Road in Lantau
|
Works
area for storage of materials and viaduct segment and site
office
|
|
WA5
|
At
the existing site offices for Yam O Road Watermains near Yam O Wan at Cheung Tung Road in Lantau
|
Works
area for storage of materials and viaduct segment and site
office
|
|
WA6
|
At
the existing site offices and storage yard for Penny’s
bay Reclamation near Yam O Wan at Cheung Tung Road in Lantau
|
Works
area for storage of materials and viaduct segment and site
office
|
|
WA23
|
At
the existing reclaimed land at Wok Tai Wan in Tsing
Yi
|
Casting
yard for fabrication of precast units, storage of work
boats, materials and site office
|
|
Tuen Mun
|
|
WA18
|
At
the existing River Trade Golf at Pillar Point in
Tuen Mun
|
Works
area for storage of materials and viaduct segment and site
office
|
|
WA19
|
At
the existing closed Pillar Point Valley Landfill at
Pillar Point in Tuen Mun
|
Works
area for storage of materials and viaduct segment and site
office
|
# Works
Area Lantua is not relevant to Toll Plaza
2.5.1.2
All the works areas are currently formed on developed
land, with some already being used as works areas for on-going construction
projects. The exception to this is WA19 which is within the Pillar Point
landfill area, and the site as a whole is largely covered with vegetation with
only a relatively small portion formed and utilized. However, the terms for use
of this site during the TM-CLKL construction requires that no trees will be
removed and therefore, only the already formed areas will be utilized. In
addition, all the sites are located away from any residential areas.
2.6.1.1
Stormwater drainage
systems will be provided to collect stormwater from
the carriageway surfaces. The stormwater will enter
into gullies along the kerb lines. The gullies will
be fitted with sumps to trap silt and grit prior to discharging the stormwater into the stormwater
drainage systems. The drainage systems will eventually discharge the stormwater into the sea at discrete locations. Similar systems
will be provided along the marine viaduct. Sump traps will be built into the deck
structure, and the collected stormwater will
discharge into the sea at the column locations.
2.6.1.2
Operational sewage will be generated but, again, in
relatively small quantities as summarized in Table 2.3 below, based upon the staffing estimates required for
the TM-CLKL project.
Table 2.3 Estimated
Sewage Generation
|
Location
|
Staff
|
Average Dry Weather Flow (m3/day)
|
|
Toll Plaza
|
110
|
38.5
|
2.6.1.3
In Tuen Mun, the sewage (Average Dry Weather Flow (ADWF))
from the toll plaza and northern ventilation building is estimated to be about
178m3 per day and with about 510 personnel on site in total. The
sewage will be discharged to the existing sewerage system and it is expected
that that adequate capacity in the local system to accommodate this amount is
available.
2.6.1.4
Not relevant to Toll Plaza EM&A programme
2.7.1.1
It is anticipated that construction for the TM-CLKL will
commence in late 2014, with a target opening date for the entire road
link at the end of 2016. An indicative construction programme showing the key activities
in different major construction areas is shown in Figures 2.9a. Locations of the construction
areas referenced in the construction programme are shown in Figures 2.9c. This is based upon
working 12 hours per day for all land works.
2.7.1.2
Not used.
2.7.1.3
Not used.
2.7.1.4
Not used.
2.7.1.5
Not used.
2.8.1.1
Not used.
2.8.1.2
As the projects HKBCF, HKLR and TM-CLKL are proposed to
be constructed concurrently and will be operational at the same time, cumulative impacts are possible and have been assessed.
2.8.2.1
The construction of the TMWB is tentatively planned to
commence in late 2011 and be completed by late 2016. The TMWB southern tunnel
and its portal will abut with the toll plaza and will interface with the
TM-CLKL (see Figures 2.4a and 2.4b). Interface of construction activities,
including construction access, temporary stockpile area within the toll plaza
site for processing, sorting, stockpiling of excavated material from the TMWB
tunnel, and any blasting impacts from the drill and blast tunnelling
method of the TMWB southern tunnel, will require detailed coordination during
the construction phase. As the projects are proposed to be constructed
concurrently and will be operational at the same time, cumulative impacts are
possible and have been assessed.
2.8.3.1
In addition to the interface with the major concurrent
projects described above, details of other concurrent projects during either
the construction and/or the operational phases, together with details of how
these are assessed in the EIA, are described in the summary table of concurrent
projects included as Appendix A2 of the EIA report.
2.9.1.1
A Local Area Model was developed to provide traffic
forecasts for EIA purposes. The EIA
requires cumulative traffic forecasts and, hence, EIA flows were produced
assuming the HZMB, HKLR, HKBCF, TMWB and TM-CLKL were all in place. In order to
achieve consistency, a consistent set of model input assumptions have been
adopted for the interfacing studies of TM-CLKL, HKBCF, HKLR and TMWB.
2.9.1.2
The TMWB was assumed to be “non-tolled” for the purposes
of the TM-CLKL EIA forecasts. This would make a marginal difference to the
predicted TM-CLKL traffic forecasts, increasing the traffic flows slightly and,
therefore, would represent a potentially worst case for assessing the
environmental impacts. The traffic
flows have been divided into the 16 vehicle classes required to determine the
emissions of the traffic.
2.9.1.3
The opening year for the whole TM-CLKL, i.e. both
northern and southern sections, is 2016. Design year peak hour traffic
forecasts have, therefore, been prepared for the years 2016, 2021 and 2031
which reflect the full operation of the TM-CLKL. In addition, to assess the
environmental impacts at the interim year of 2014, when the southern section
will be opened to form part of the new road network servicing the HKBCF Phase 1
commissioning, the relevant traffic forecasts for this year have also been
prepared. A summary of the traffic data for the prevailing year of 2007 and the
future years of 2014, 2016, 2021 and 2031 and the road links are included in
the EIA Report.
As per Condition 2.4 of
the EP of TM-CLKL, an enhanced monitoring plan on TSP level at Tuen Mun (“the
Enhanced TSP Monitoring Plan”) is required to be submitted to the DEP for
approval at least 1 month before the commencement of construction of the
Project. Details of the Enhanced TSP Monitoring Plan are provided in this Contract
specific EM&A Manual. The air
quality monitoring work under this Contract and Contract HY/2012/08 will follow
the monitoring requirement of enhanced TSP monitoring under the project.
3.1.1.1
Monitoring of the Total Suspended Particulates (TSP) levels
shall be carried out by the Environmental Specialist (ET) (see Section 1) to
ensure that construction works are not generating dust which exceeds the
acceptable level. Timely action should be taken to rectify the situation if an
exceedance is detected.
3.1.1.2
1-hour and 24-hour TSP levels shall be measured to
indicate the impacts of construction dust on air quality. The TSP levels shall
be measured by following the standard high volume sampling method as set out in
the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B. Upon approval by the Engineer’s
Representative (ER) and the Environmental Protection Department (EPD), 1-hour
TSP levels may be measured by direct reading methods for ad hoc measurements.
3.1.1.3
All relevant data including temperature, pressure,
weather conditions, elapsed time meter reading for the start and stop of the
sampler, identification and weight of the filter paper, any other special
phenomena and work progress of the concerned site shall be recorded in detail
by the ET. A sample data sheet is
shown in Figure 3.1.
3.2.1.1
A high volume sampler in compliance with the following
specifications shall be used for carrying out the 1-hr and 24-hr TSP
monitoring:
(i)
0.6-1.7 m3/min (20-60 SCFM) adjustable flow range;
(ii)
equipped with a timing/control device with +/- 5 minutes
accuracy for 24 hours operation;
(iii)
installed with elapsed-time meter with +/- 2 minutes
accuracy for 24 hours operation;
(iv)
capable of providing a minimum exposed area of 406 cm2
(63 in2);
(v)
flow control accuracy: +/- 2.5% deviation over 24-hr
sampling period;
(vi)
equipped with a shelter to protect the filter and
sampler;
(vii)
incorporated with an electronic mass flow rate controller
or other equivalent devices;
(viii)
equipped with a flow recorder for continuous monitoring;
(ix)
provided with a peaked roof inlet;
(x)
equipped with a manometer;
(xi)
able to hold and seal the filter paper to the sampler
housing in a horizontal position;
(xii)
easy to change the filter; and
(xiii)
capable of operating
continuously for 24-hr period.
3.2.1.2
The Contractor is responsible for provision of the
monitoring equipment and shall ensure that sufficient numbers of high volume
samplers with an appropriate calibration kit are available for carrying out the
baseline monitoring, impact monitoring and ad hoc monitoring. The high volume
samplers shall be equipped with an electronic mass flow controller and be
calibrated against a traceable standard at regular intervals. All the
equipment, calibration kit, filter papers, etc. shall be clearly labelled by
the ET.
3.2.1.3
Calibration of dust monitoring equipment shall be
conducted by the ET upon installation and thereafter at bi-monthly intervals.
The transfer standard shall be traceable to the internationally recognized
primary standard and be calibrated annually. The calibration data shall be
properly documented for future reference by concerned parties, such as the IEC.
All the data shall be converted into standard temperature and pressure
condition.
3.2.1.4
The flow-rate of the sampler before and after the
sampling exercise with the filter in position shall be verified to be constant
and recorded in the data sheet as described in Section 3.1.
3.2.1.5
If the ET proposes to use a direct reading dust meter to
measure 1-hr TSP levels on an ad hoc basis, he shall submit sufficient
information to the IEC to prove that the instrument is capable of achieving a
comparable result as that the High Volume Sampler (HVS) and may be used for the
1-hr sampling. The instrument should also be calibrated regularly and the 1-hr
sampling shall be checked periodically by the HVS to check the validity and
accuracy of the results measured by the direct reading method.
3.2.1.6
Wind data monitoring equipment shall also be provided and
set up at suitable locations for logging wind speed and wind direction near to
the dust monitoring locations. The equipment installation location shall be
proposed by the ET and agreed with the ER, in consultation with the IEC.
3.2.1.7
For installation and operation of wind data monitoring
equipment, the following points shall be observed:
(i)
the wind sensors should be installed on masts at an
elevated level 10 m above ground so that they are clear of obstructions or
turbulence caused by the buildings;
(ii)
the wind data should be captured by a data logger to be
down-loaded for processing at least once a month;
(iii)
the wind data monitoring equipment should be
re-calibrated at least once every six months; and
(iv)
wind direction
should be divided into 16 sectors of 22.5 degrees each.
3.2.1.8
In exceptional situations, the ET may propose alternative
methods to obtain representative wind data upon approval from the ER and
agreement from the IEC.
3.3.1.1
A clean laboratory with constant temperature and humidity
control and equipped with necessary measuring and conditioning instruments
shall be used for sample analysis and equipment calibration and maintenance.
The laboratory shall be HOKLAS accredited.
3.3.1.2
If a site laboratory is set up or a non-HOKLAS accredited
laboratory is hired for carrying out the laboratory analysis, the laboratory
equipment shall be approved by the ER, in consultation with the IEC.
Measurement performed by the laboratory shall be demonstrated to the
satisfaction of the ER and the IEC. The IEC shall conduct regular audits of
the measurements performed by the laboratory to ensure the accuracy of the
results. The ES shall provide the ER and the IEC with one copy each of the
Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B for reference.
3.3.1.3
Filter paper of size 8"x10" shall be labelled
before sampling. It shall be a clean filter paper with no pin holes and shall
be conditioned in a humidity controlled chamber for over 24-hr and be
pre-weighed before use for the sampling.
3.3.1.4
After sampling, the filter paper loaded with dust shall
be kept in a clean and tightly sealed plastic bag. The filter paper shall then
be returned to the laboratory for reconditioning in the humidity controlled
chamber followed by accurate weighing by an electronic balance with readout
down to 0.1mg. The balance shall be
regularly calibrated against a traceable standard.
3.3.1.5
All the collected samples shall be kept in a good
condition for 6 months before disposal.
3.4.1.1
The air quality sensitive receivers, as determined by the
EIA, are shown in Figure 3.2 and
these will also form the recommended dust monitoring locations. In addition,
three extra air monitoring stations are proposed in the approved Enhanced TSP Monitoring
Plan which simultaneously with the air quality impact monitoring in the
EM&A Programme. The air quality monitoring stations
under the Contract is shown Figure 3.2a
and summarized in Table 3.1. The status
and locations of dust sensitive receivers may change after issue of this manual.
If this happens, the ET shall propose updated monitoring locations and seek
approval from the ER and agreement from IEC.
Table 3.1 Air Quality Monitoring Station under
the Contract
|
Air quality monitoring station
|
Location
|
Landuse
|
No. of Storey
|
Horizontal Distance to the Major Construction Area (m)
|
|
Northern Landfall
|
Toll Plaza
|
|
ASR1
|
Tuen Mun Fireboat Station
|
Office
|
1
|
<50
|
<50
|
|
ASR5
|
Pillar Point Fire Station
|
Office
|
5
|
<50
|
>500
|
|
AQMS1
|
Previous River Trade Golf
|
Bare ground
|
0
|
270
|
60
|
|
ASR6
|
Butterfly Beach Laundry
|
Office
|
0
|
350
|
<50
|
|
ASR10
|
Butterfly Beach Park
|
Recreational uses
|
0
|
>1000
|
170
|
3.4.1.2
When alternative monitoring locations are proposed, the
following preferred locations and factors shall be considered:
(i)
the site boundary or locations close to the major dust
emission source;
(ii)
close to the sensitive receptors; and
(iii)
the prevailing
meteorological conditions.
3.4.1.3
The ET shall agree with the ER, in consultation with the
IEC, the position of the high volume samplers. When positioning the samplers,
the following points shall be noted:
(i)
a horizontal platform with appropriate support to secure
the samplers against gusty wind shall be provided;
(ii)
the distance between the sampler and an obstacle, such as
buildings, shall be at least twice the height that the obstacle protrudes above
the sampler;
(iii)
a minimum of 2 metres of
separation from walls, parapets and penthouses is required for rooftop
samplers;
(iv)
a minimum of 2 metres
separation from any supporting structure, measured horizontally is required;
(v)
no furnace or incinerator flue is nearby;
(vi)
airflow around the sampler is unrestricted;
(vii) the sampler
is more than 20 metres from the dripline;
(viii) any wire
fence and gate, to protect the sampler, shall not cause any obstruction during
monitoring;
(ix)
permission must be obtained to set up the samplers and to
obtain access to the monitoring stations;
(x)
a secured supply of electricity is needed to operate the
samplers; and
(xi)
no two samplers
should be placed less than 2 metres apart.
3.4.1.4
Prior to construction, the dust monitoring schedule shall
be developed by the ET based upon the construction schedule supplied by the
Contractor. The ET shall inform the IEC of the impact monitoring programme such
that he can conduct onsite audits to ensure accuracy of the impact monitoring
results. The environmental monitoring schedule shall be approved by the ER.
Baseline monitoring at
five monitoring stations has been conducted by the ET of HyD
Contract HY/2012/08 in October 2013 and the associated baseline report has been
submitted to the EPD for approval. It is agreed amongst by the Contractor,
RE, IEC that this Contract could make use of the baseline monitoring data collected
by the ET under HY/2012/08 and therefore no baseline monitoring is required under
this Contract.
3.6.1.1
The Enhanced TSP Monitoring Plan will be implemented
simultaneously with the air quality impact monitoring in the EM&A
programme. In addition to the TSP monitoring at ASR1 and ASR5, monitoring will
also be undertaken at the additional monitoring stations AQMS1, AQMS2 and ASR10
following the frequency of air quality impact monitoring stated in the EM&A
Manual. The data collected will be used to provide an indication of whether
there is any significant increase in TSP levels upon commencement of
construction activities of the Northern Connection, toll plaza and tunnel
buildings. TSP monitoring, including those required under the approved EM&A
Manual (ie for ASR1 andASR5 only) and this Enhanced
TSP Monitoring Plan, will not be implemented during
the TCSS installation works which will not involve any civil works.
3.6.1.2
The major sources of dust nuisance arising from the
Northern Connection, toll plaza and tunnel buildings are related to excavation,
slope works, foundation works, construction of road and superstructures, wind
erosion from reclaimed areas, open sites and stockpiling areas. Therefore
during these construction activities, the TSP monitoring frequency will be
increased at all air quality monitoring stations such that any deteriorating
air quality can be readily detected and timely action taken to rectify the
situation. The Enhanced TSP Monitoring Plan during construction phase is
summarized in Table 3.2.
Table 3.2 Enhanced TSP Monitoring Plan –
Construction Phase
|
Monitoring Parameter
|
Monitoring Location
|
Frequency
|
Monitoring Condition
|
|
|
|
1-hour TSP
|
ASR1, ASR5, ASR10, AQMS1, AQMS2
|
3 times per day
every six days
|
Throughout the
Northern Connection, toll plaza and tunnel buildings construction works
|
|
|
24-hour TSP
|
ASR1, ASR5, ASR10, AQMS1, AQMS2
|
Daily every six
days
|
Throughout the
Northern Connection, toll plaza and tunnel buildings construction works
|
|
|
1-hour TSP
|
ASR1, ASR5, ASR10, AQMS1, AQMS2
|
3 times per day
every three days
|
Northern Connection
During excavation
works for launching shaft, excavation work for Cut and Cover Tunnel and Cut
and Cover Tunnel Construction
Toll Plaza
During excavation,
slope works, construction of road an superstructures and wind erosion from
open sites and stockpiling areas
Tunnel Buildings
During excavation,
foundation works, construction of superstructures and wind erosion from open
sites and stockpiling areas
|
|
|
24-hour TSP
|
ASR1, ASR5, ASR10, AQMS1, AQMS2
|
Daily every three
days
|
Northern Connection
During excavation
works for launching shaft, excavation work for Cut and Cover Tunnel and Cut
and Cover Tunnel Construction
Toll Plaza
During excavation,
slope works, construction of road an superstructures and wind erosion from
open sites and stockpiling areas
Tunnel Buildings
During excavation,
foundation works, construction of superstructures and wind erosion from open
sites and stockpiling areas
|
|
3.6.1.3
The specific time to start and stop the 24-hr TSP
monitoring shall be clearly defined for each location and be strictly followed
by the operator.
3.6.1.4
In accordance with the PS Clause 25.32 under this
contract, dust monitoring by the ET under this Contract could be exempted until
the completion of the air quality monitoring carried out by the ET of HyD Contract No. HY/2012/08. It is agreed amongst by the
Contractor, RE, IEC that the ET under this Contract could make use of impact
air quality monitoring data collected by the ET under HY/2012/08 for its own
reporting.
3.7.1.1
The baseline monitoring results will form the basis for
determining the air quality criteria for the impact monitoring. The ET shall
compare the impact monitoring results with air quality criteria set up for
24-hour TSP and 1-hour TSP. The
method of derivation and the proposed Action and Limit Levels are shown in Tables
3.3 and 3.3a respectively.
Table 3.3 Action
and Limit Levels for Air Quality
|
Parameters
|
Action
|
Limit
|
|
24 Hour TSP Level in μg/m3
|
For baseline level ≤ 200 μg/m3
Action level = (Baseline *1.3+ Limit level )/2;
For baseline level >200 μg/m3
Action level = Limit level
|
260
|
|
1 Hour TSP Level in μg/m3
|
For baseline level ≤ 384 μg/m3
Action level = (Baseline *1.3+ Limit level )/2;
For baseline level
>384 μg/m3
Action level = Limit level
|
500
|
Table 3.3a TSP
Action and Limit Levels for Impact Air Quality Monitoring
|
Parameters
|
Air
Quality Monitoring Stations
|
Action Level
(μg/m3)
|
Limit Level
(μg/m3)
|
|
24 hour TSP (μg/m3)
|
ASR1
|
213
|
260
|
|
ASR5
|
238
|
260
|
|
AQMS1
|
213
|
260
|
|
AQMS2
|
238
|
260
|
|
ASR10
|
214
|
260
|
|
1 hour TSP (μg/m3)
|
ASR1
|
331
|
500
|
|
ASR5
|
340
|
500
|
|
AQMS1
|
335
|
500
|
|
AQMS2
|
338
|
500
|
|
ASR10
|
337
|
500
|
3.7.1.2
In case of non-compliance with the air quality criteria,
more frequent monitoring exercise shall be conducted within 24 hours after the
result is obtained. This additional
monitoring shall be continued until the excessive dust emission or the deterioration
in air quality is rectified. The
Event/Action Plan for air quality is given in the attached Table 3.4.
3.7.1.3
The Independent Environmental Checker (IEC) shall be
empowered to audit the environmental performance of construction,
all aspects of the EM&A programme, validate and confirm the accuracy of
monitoring results, monitoring equipment, monitoring locations and procedures.
If any exceedances occur, the IEC shall follow the actions stated in the Event
and Action Plan in Table 3.4.
3.8.1.1
The EIA report has recommended dust control and
mitigation measures. The Contractor
shall be responsible for the design and implementation of the following measures.
The recommended construction dust
mitigation measures are summarized in the Air Quality Environmental Mitigation
Implementation Schedule provided in Appendix A.
(i)
all
unpaved roads/exposed area shall be watered which results in dust suppression
by forming moist cohesive films among the discrete grains of road surface
material. An effective watering
programme of twice daily watering with complete coverage,
is estimated to reduce by 50%. This
is recommended for all areas in order to reduce dust levels to a minimum;
(ii)
Watering on all exposed soil within the
Project site and associated work areas in Tuen Mun area throughout the
construction phase for at least 12 times per day;
(iii)
The Contractor shall, to the satisfaction of
the Engineer, install effective dust suppression measures and take such other
measures as may be necessary to ensure that at the Site boundary and any nearby
sensitive receiver, dust levels are kept to acceptable levels;
(iv)
The Contractor shall not burn debris or other
materials on the works areas;
(v)
in hot, dry or windy weather, the watering
programme shall maintain all exposed road surfaces and dust sources wet;
(vi)
where
breaking of oversize rock/concrete is required, watering shall be implemented
to control dust. Water spray shall be used during the handling of fill material
at the site and at active cuts, excavation and fill sites where dust is likely
to be created;
(vii) open
dropping heights for excavated materials shall be controlled to a maximum
height of 2m to minimize the fugitive dust arising from unloading;
(viii) during transportation by truck, materials
shall not be loaded to a level higher than the side and tail boards, and shall
be dampened or covered before transport. Materials having the potential to
create dust shall not be loaded to a level higher than the side and tail
boards, and shall be covered by a clean tarpaulin. The tarpaulin shall be
properly secured and shall extend at least 300mm over the edges of the side and
tail boards;
(ix)
no
earth, mud, debris, dust and the like shall be deposited on public roads. Wheel washing facility shall be usable
prior to any earthworks excavation activity on the site;
(x)
areas of exposed soil shall be minimized to
areas in which works have been completed shall be restored as soon as is
practicable; and
(xi)
all
stockpiles of aggregate or spoil shall be enclosed or covered and water applied
in dry or windy condition.
3.8.1.2
If the above measures are not sufficient to restore the
air quality to acceptable levels upon the advice of the ET, the Contractor
shall liaise with the ET regarding other mitigation measures and consult the
IEC for their effectiveness, and then propose these measures to the ER for
approval prior to the implementation of the measures.
