Job No.: TCS00715/14










Tuen Mun - Chek Lap Kok Link

Contract No. HY/2013/12 –

Northern Connection Toll Plaza and Associated Works











Contract Specific Environmental Monitoring and Audit (EM&A) Manual











Prepared For

CRBC and Kaden Joint Venture








Reference No.

Prepared By

Certified By

17 March 2015


Nicola Hon

(Environmental Consultant)

T.W. Tam

(Environmental Team Leader)















This report has been prepared by Action-United Environmental Services & Consulting with all reasonable skill, care and diligence within the terms of the Agreement with the client, incorporating our General Terms and Conditions of Business and taking account of the resources devoted to it by agreement with the client. We disclaim any responsibility to the client and others in respect of any matters outside the scope of the above. This report is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this report, or any part thereof, is made known. Any such party relies upon the report at their own risk.

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   Baseline Landscape Resources with Development Proposal Overlaid (Sheet 1 of 5)

Figure   Baseline Landscape Resources with Development Proposal Overlaid (Sheet 2 of 5)

Figure   Baseline Landscape Character Areas with Development Proposal Overlaid (Sheet 1 of 5)

Figure   Baseline Landscape Character Areas with Development Proposal Overlaid (Sheet 2 of 5)

Figure   Baseline Key VSRs and Viewpoint at Local Level with Development Proposal Overlaid During Construction (Sheet 1 of 2)

Figure   Baseline Key VSRs and Viewpoint at Local Level with Development Proposal Overlaid During Operation (Sheet 1 of 2)

Figure   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                                  Introduction

1.1                            Background Information                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.                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.                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.                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.                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.                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.                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.                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                            Policy                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                            EM&A Programme Objectives                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.                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.                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


EM&A Phase


Construction Phase

Operational Phase

Air Quality





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.





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




Waste/Contaminated Land




Cultural Heritage




       Remarks: Y = Yes


1.4                            Scope of the EM&A Programme                The scope of the EM&A programme is to undertake the following:

a.)           Implement monitoring and audit activities for each environmental parameter as follows:


i.       Establish baseline dust levels at specified locations and review these levels on a regular basis.

ii.     Implement construction dust impact monitoring programme.


i.       Not relevant to Toll Plaza.


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.


i.       Implement construction phase audit requirements for waste aspects.


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.                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.                This Manual is considered to be a working document and should be reviewed periodically and revised once substantial changes have been made.


1.5                            Project Organization                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.                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.                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.                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.                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.                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.                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.                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.                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.            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.            The exact responsibilities and organization of the ENPO will be defined during the detailed design stage.


1.6                            Terminology                To clarify the terminology for impact monitoring and audit, key definitions are specified below and are used throughout this Manual.                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.                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.                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                                  PROJECT DESCRIPTION

2.1                            Scope of the Project                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.                Details of the various elements of the selected TM-CLKL alignment are detailed in the sections below.


2.2                            Northern Section in Tuen Mun

2.2.1                  Northern Reclamation (Not used)

2.2.2                  Viaduct Connection and Slip Roads (Not used)

2.2.3                  Toll Plaza                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.                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




Auto-toll Lane

Manual-toll Lane

Auto-toll Lane

Manual-toll Lane

TM-CLKL only






TMWB only














25                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.                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.                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.                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.                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.                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.                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.            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.            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.            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                  Other Construction Works                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.


2.3                            Submarine Tunnel (not used)

2.4                            Southern Section at HKBCR/ North Lantau (not used)

2.5                            Works Areas                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


Proposed Use

Lantau #


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


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


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


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


At the existing River Trade Golf at Pillar Point in Tuen Mun

Works area for storage of materials and viaduct segment and site office


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                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                            Sewage and Drainage                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.                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



Average Dry Weather Flow (m3/day)

Toll Plaza


38.5                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.                Not relevant to Toll Plaza EM&A programme


2.7                            Project Programme                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.                Not used.                Not used.                Not used.                Not used.


2.8                            Concurrent Projects

2.8.1                  Interface with HKBCF and HZMB HKLR                Not used.                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                  Interface with Tuen Mun Western By-pass                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                  Other Concurrent Projects                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                            Traffic Data and Assumptions                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.                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.                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.



3                                  AIR QUALITY

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                            Air Quality Parameters                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.                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.                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                            Monitoring Equipment                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.                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.                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.                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.                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.                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.                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.                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                            Laboratory Measurement/Analysis                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.                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.                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.                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.                All the collected samples shall be kept in a good condition for 6 months before disposal.


3.4                            Monitoring Locations                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



No. of Storey

Horizontal Distance to the Major Construction Area (m)

Northern Landfall

Toll Plaza


Tuen Mun Fireboat Station






Pillar Point Fire Station






Previous River Trade Golf

Bare ground





Butterfly Beach Laundry






Butterfly Beach Park

Recreational uses



170                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.       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.                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.


3.5                            Baseline Monitoring

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                            Impact Monitoring                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.                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


Monitoring Condition

1-hour TSP


3 times per day every six days

Throughout the Northern Connection, toll plaza and tunnel buildings construction works


24-hour TSP


Daily every six days

Throughout the Northern Connection, toll plaza and tunnel buildings construction works


1-hour TSP


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


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                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.                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                            Event and Action Plan for Air Quality                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




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


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



Table 3.3a        TSP Action and Limit Levels for Impact Air Quality Monitoring


Air Quality Monitoring Stations

Action Level


Limit Level


24 hour TSP (μg/m3)
















1 hour TSP (μg/m3)















500                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.                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                            Dust Mitigation Measures                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.                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.



Table 3.4          Event / Action Plan for Air Quality







Action Level

Exceedance recorded

1       Identify the source.

2       Repeat measurements to confirm findings. If two consecutive measurements exceed Action Level, the exceedance is then confirmed.

3       Inform the IEC and the SOR

4       Investigate the cause of exceedance and check Contractor’s working procedures to determine possible mitigation to be implemented.

5       If the exceedance is confirmed to be Project related after investigation, increase monitoring frequency to daily.

6       Discuss with the IEC and the Contractor on remedial actions required.

7       If exceedance continues, arrange meeting with the IEC and the SOR.

8       If exceedance stops, cease additional monitoring.

1      Check monitoring data submitted by the ET.

2      Check the Contractor’s working method.

3      If the exceedance is confirmed to be Project related after investigation, discuss with the ET and the Contractor on possible remedial measures.

4      Advise the SOR on the effectiveness of the proposed remedial measures.

5      Supervisor implementation of remedial measures.

1     Confirm receipt of notification of failure in writing.

2     Notify the Contractor.

3     Ensure remedial measures properly implemented.

1    Rectify any unacceptable practice.

2    Amend working methods if appropriate

3    If the exceedance is confirmed to be Project related, submit proposals for remedial actions to IEC within 3 working days of notification

4    Implement the agreed proposals