table of Contents

1                      Introduction                                                                           

1.1                   Background Information                                                 

1.2                   Policy                                                                                         

1.3                   EM&A Programme Objectives                                          

1.4                   Scope of the EM&A Programme                                      

1.5                   Project Organisation                                                        

2                      Project Description                                                           

2.1                   Scope of the Project                                                         

2.2                   Northern Section In Tuen Mun                                        

2.3                   Submarine Tunnel                                                                 

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

2.5                   Works Area                                                                             

2.6                   Sewage and Drainage                                                         

2.7                   Project Programme                                                            

2.8                   Concurrent Projects                                                        

2.9                   Traffic Data and Assumptions                                       

3                      Air Quality                                                                               

3.1                   Air Quality Parameters                                                     

3.2                   Monitoring Equipment                                                        

3.3                   Laboratory Measurement/ Analysis                           

3.4                   Monitoring Locations                                                        

3.5                   Baseline Monitoring                                                           

3.6                   Impact Monitoring                                                                

3.7                   Event and Action Plan for Air Quality                      

3.8                   Dust Mitigation Measures                                                

4                      Noise                                                                                           

4.1                   Introduction                                                                           

4.2                   Noise Mitigation Measures                                               

5                      Water Quality                                                                        

5.1                   Introduction                                                                           

5.2                   Mitigation Meaures                                                              

6                      Ecology                                                                                     

6.1                   Introduction                                                                           

7                      LANDSCAPE AND VISUAL ASSESSMENT                              

7.1                   Introduction                                                                           

7.2                   Relevant Legislation                                                         

7.3                   Methodology and Criteria                                              

7.4                   Baseline Monitoring                                                           

7.5                   Event and Action Plan                                                        

7.6                   Mitigation Measures                                                           

8                      Waste Management and Contaminated Land           

8.1                   Waste Issues                                                                           

8.2                   Contaminated Land                                                              

8.3                   Waste EM&A Requirements                                               

9                      Cultural heritage                                                               

9.1                   Introduction                                                                           

10                    Landfill Gas HAzard Assessment                               

10.1                 Introduction                                                                           

10.2                 Monitoring and Measurement of Landfill Gas      

11                    Site Environmental Audit                                                  

11.1                 Site Inspections                                                                     

11.2                 Compliance with Legal and Constractual Requirements      

11.3                 Enviromnental Complaints                                              

11.4                 Choice of Construction Method                                   

12                    Reporting                                                                                

12.1                 General                                                                                     

12.2                 Documentation                                                                      

12.3                 Design Audit Report                                                            

12.4                 Baseline Monitoring Report                                           

12.5                 EM&A Reports                                                                         

12.6                 First EM&A Report                                                                

12.7                 Subsequent EM&A Reports                                               

12.8                 Quarterly EM&A Summary Reports                              

12.9                 Annual/Final EM&A Review Reports                              

12.10               Data Keepking                                                                         

12.11               Interim Notifications of Enviromental Quality Limit Exceedances       


Appendix A    Environmental Mitigation Implementation Schedule

Appendix B   Environmental Proformas


Annex A       Figures

Annex B       Summary of Changes




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 MunChek 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.                     This is the Contract specific EM&A Manual for the Contract No. HY/2017/10 for the Northern Connection Tunnel Buildings, Electrical and Mechanical Works of TM-CLKL. 

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:

·              establish a commitment to environmental excellence in all activities arising from the development project;

·                      encourage the adoption of environmental management principles to prevent potential impacts and minimise adverse impacts; and

·                      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:


·              to ensure the specified mitigation recommendations of the EIA are included in the design of the project;

·              to clarify and identify sources of pollution, impact and nuisance arising from the works;

·              to confirm compliance with legal, contract specifications and EIA study recommendations;

·              to provide an early warning system for impact prevention;

·              to provide a database of environmental parameters against which to determine any short term or long term environmental impacts;

·              to propose timely, cost-effective and viable solutions to actual or potential environmental issues;

·              to monitor performance of the mitigation measures and to assess their effectiveness and, whenever necessary, identify any further need for additional measures;

·              to verify the EIA predicted impacts;

·              to collate information and evidence for use in public, District Council and Government consultation; and

·              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 Contract since there is no noise sensitive receiver identified for the Project Area.


Not relevant to the Contract since there is no ecological sensitive receiver identified for the Project Area.

Water Quality

Not relevant to the Contract since the construction activities are land-based

Landscape and Visual




Waste/Contaminated Land




Cultural Heritage

Not relevant to the Contract since there is no cultural heritage resource identified for the Project Area.

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:



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



Implement construction dust impact monitoring programme.



Not relevant to this Contract



Not relevant to this Contract

Water Quality


Not relevant to this Contract

Landscape and Visual:


Design detailed landscape specifications.


Not relevant to this Contract


Implement construction phase audit requirements for landscape and visual resources.


Implement operational phase audit requirements for landscape and visual aspects



Implement construction phase audit requirements for waste aspects



Not relevant to this Contract

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:

Ÿ  the level of the Contractor’s general environmental awareness;

Ÿ  the Contractor’s implementation of the recommendations in the EIA;

Ÿ  the Contractor’s performance as measured by the EM&A;

Ÿ  the need for specific mitigation measures to be implemented or the continued usage of those previously agreed; and

Ÿ  to advise the site staff of any identified potential environmental issues.

j)                Submit EM&A reports which summarise 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 organisation 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)   Organisation 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, summarising 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 Organisation                     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 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 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 as well as supervision of waste management.                     Accordingly, a Registered Landscape Architect, as defined by the Landscape Architect’s Registration Board, will be required to assist the ET to monitor and audit the landscaping installation works.                     The overall duties of ETL and the team are as follows:

·                 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.

·                 Environmental site surveillance.

·                 Audit of compliance with environmental protection and pollution prevention and control regulations.

·                 Monitor the implementation of environmental mitigation measures.

·                 Monitor compliance with the  environmental protection clauses/specifications in the Contract.

·                 Review construction programme and comment as necessary.

·                 Review construction methodology and comment as necessary.

·                 Complaint   investigation, evaluation and identification of corrective measures.

·                 Audit of the EMS and recommend and implement any changes as appropriate.

·                 Liaison with the Independent Environmental Checker IEC on all environmental performance matters.

·                 Advice to the Contractor on environmental improvement, awareness, enhancement matter, etc., on site.

·                 Timely submission of the designated EM&A reports to the ER, the IEC and the DEP 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:

·                 Review and audit all aspects of the EM&A programme.

·                 Validate and confirm the accuracy of monitoring results, monitoring equipment, monitoring locations, monitoring procedures and locations of sensitive receivers.

·                 Carry out random sample check and audit on monitoring data and sampling procedures, etc.

·                 Conduct random site inspection.

·                 Audit the EIA recommendations and requirements against the status of implementation of environmental protection measures on site.

·                 Review the effectiveness of environmental mitigation measures and project environmental performance.

·                 Audit the Contractor’s construction methodology and agree the least impact alternative in consultation with the ET and the Contractor.

·                 Check complaint cases and the effectiveness of corrective measures.

·                 Review EM&A report submitted by the ET.

·                 Feedback audit results to ET by signing off relevant EM&A proformas.                An organisation 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:

·              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;

·              identify and assess cumulative impacts including possible sources/causes of exceedance and recommending suitable remedial actions;

·              undertake liaison with the mainland project teams counterparts to identify and assess any cross-boundary cumulative impacts; and

·              coordinate the assessment and response to complaints/enquires from locals, green groups, district councils or the public at large.            The role of ENPO is to ensure compliance with the requirements stipulated in the EM&A documents and proper implementation of the EM&A programme as laid down in the EM&A documents. The role of the ENPO include the following:

·              To oversee and address the cumulative environmental impacts arising from the construction of the TM-CLKL Project and other concurrent projects in the adjoining area;

·              to provide the IEC services as required in the EM&A Documents;

·            to ensure that the environmental impacts arising from the construction activities of the TM-CLKL Project are addressed and resolved in a timely, cost effective and proactive manner in order to comply with the requirements in the EM&A Documents;

·              to assist in handling and responding to public enquiries and complaints about environmental issues of the TM-CLKL contracts;

·              to maintain a dedicated web site to facilitate public inspection of the Baseline Monitoring Report and monthly EM&A Reports via the EIAO Internet Website and at the EIAO Register Office; and

·              to provide expert advice to the HyD on environmental issues.

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 measurement of air quality and landfill gas parameters, during Project construction and implementation so as to detect changes in these parameters 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:

·              the process of verification that all or selected parameters measured by air quality impact monitoring programme or levels  of an operation are in compliance with regulatory requirements and internal policies and standards; and

·              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 quality 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 impact 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               At the northern landfall in Tuen Mun, adjacent to the River Trade Terminal at Pillar Point, the construction of TM-CLKL requires a reclamation of about 16.5ha of land area when calculated to the cope line, or 21.1ha of land for the footprint area to the bottom of the seawall where it intersects the seabed. The general layout are shown in Figures 2.3a.               Not used.               Not used.               Not used.               Not used.               Construction of the northern reclamation, which partly abuts the existing seawall at Pillar Point, will affect the marine operations of the Government Berths at Tuen Mun River Trade Terminal, including Customs and Excise (C&E) and Immigration (ImmD) Departments and Fire Services Department’s  (FSD) Fire Boat Station. Provisions have been made to relocate these facilities to the new reclamation alongside the eastern seawall (see Figure 2.2a).

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 and 2.4b. 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:

·     travelling from/to TM-CLKL only;

·     travelling from/to TMWB only; and

·     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 authorised 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:

·              an administration building which could cater for 2 tunnel operators (including individual workshops, garage and maintenance buildings);

·              a weigh station;

·              a vehicle recovery area;

·              turnaround facilities;

·              vehicle cross-over area;

·              a petrol filling station;

·              bus lay-bys with footbridge links; and

·              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 2.4a and 2.4b, 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 (Not used)

2.3                          Submarine Tunnel

2.3.1                     Alignment and Construction                The preferred horizontal alignment of the proposed submarine tunnel, shown in Figure 2.1, is 5km long and crosses the Urmston Road sea channel, connecting Tuen Mun to the TM-CLKL southern landfall at the HKBCF reclamation, east of the airport island. As described in Section 2, the tunnel is proposed to be constructed using a TBM in order to avoid disturbance to the seabed and minimise the amount of dredged material too be removed.                The tunnel begins at the northern portal situated at the northern landfall where the ground level will be approximately +6.0mPD. The submarine tunnel then runs southward under Urmston Road, where the lowest tunnel bottom level will reach approximately -49mPD, towards the reclamation attached to the east of the proposed HKBCF where it ends at the southern portal. Reclamation works for the TM-CLKL southern landfall will bring the new ground level to around +6mPD. The vertical alignment of the tunnel is shown in Figures 2.5a to 2.5c. As shown in these figures, as the tunnel rises up to the portals, any seabed disturbance will be contained within the reclamation areas at either end of the tunnel and, as such, further seabed loss and disturbance with not occur from the tunnel itself. Construction of the TBM tunnel will commence at the northern landfall reclamation where a land area is required for construction of the launching shaft for the TBM. The TBM will start boring from the launching shaft towards the southern reclamation adjacent to HKBCF where a TBM retrieval shaft will be constructed for the removal of the TBM.

2.3.2                     Ventilation Buildings                Two ventilation buildings have been proposed at either end of the submarine tunnel to discharge the polluted tunnel air. Location of the north and south ventilation buildings are shown in Figures 2.2a and 2.2b and described below.                The North Ventilation Building (NVB) will be located at the southern end of the northern landfall reclamation of the TM-CLKL tunnel, and will be used to extract polluted tunnel air from the northbound tunnel. The cross-sectional area of stack will be about 94m2, and the exit velocity of the emissions will be about 4m/s. The building has three storeys above ground and two levels of basement. The mid- discharge height from the stack is 16.15m above ground, which equates to between 14.15m and 18.15m high. The exhaust direction will be towards the sea and is proposed to be inclined at 45 degree upward.                Not used.

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

2.5                          Works Area                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 at Tuen Mun are shown in Figures 2.8a and described in Table 2.2 below.

Table 2.2     Details of TM-CLKL Proposed Works Areas

Works Area


Proposed Use


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


* Not relevant to the Northern Connection Tunnel Buildings, Electrical and Mechanical Works of TM-CLKL.                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 utilised. 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 utilised. In addition, all the sites are located away from any residential areas.                An overall view of the works area under this Contract are presented in Figure 2.8b-e.

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 summarised 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)

Northern Landfall


140 m3/day

Toll Plaza


38.5 m3/day                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 adequate capacity in the local system to accommodate this amount is available.                Not used.

2.7                          Project Programme                The works under this Contract commenced on 7 June 2018 and it is anticipated that works will be completed in 2021.  The works mainly comprise of the construction of tunnel buildings, ancillary buildings and facilities, tunnel cladding and signage as well as E&M works including the tunnel ventilation system, tunnel and approach road lighting system, toll collection system, plumbing and drainage system in tunnel and approach road, fire services systems in tunnel and approach road.  An indicative construction programme showing the key activities in different major construction areas is shown in Figure 2.9.                Not used.                Not used.                Not used.                Not used.

2.8                          Concurrent Projects

2.8.1                     Interface with HKBCF and HZMB HKLR (Not used)

2.8.2                     Interface with Tuen Mun Western By-pass                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


2.8.2                         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, as estimated before 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 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 (DEP), 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 number 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 recognised 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 a readout down to 0.1 mg. 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.  Three additional air quality monitoring stations were also proposed in the approved Enhanced TSP Montioring Plan which will be monitored simutaneouly with the air quality impact monitoring in the EM&A Programme.  The air quality monitoring stations under the Contract are shown in Figure 3.2a and summarized in Table 3.1.

Table 3.1         Enhanced TSP Monitoring Plan – Monitoring Stations

Air quality monitoring station



No. of Storey

Horizontal Distance to the Major Construction Area (m)





Northern Lanfall

Toll Plaza


Tuen Mun Fireboat Station



< 50

< 50


Pillar Point Fire Station



< 50

> 500




Previous River Trade Golf


Bare ground








Bare ground at Ho Suen Street

Bare ground



< 50


Butterfly Beach Park

Recreational uses


> 1000


*Notes: AQMS2 was relocated and HVS was re-installed at ASR6 (Butterfly Beach Laundry) on 17 January 2014.  AQMS2 was then superseded by ASR6 for the impact air quality monitoring.  Impact air quality monitoring at ASR6 commenced on 21 January 2014.


                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 on- site 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 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.  TSP monitoring, including those required under the approved EM&A Manual (ie for ASR1 and ASR5 only) and the 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)


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 and  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 and 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


Noted: (1) The Enhanced TSP Monitoring Plan will be undertaken when any of the monitoring condition(s) is triggered.                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 case of non-compliance with the air quality criteria, more frequent monitoring, as specified in the Action Plan in Section 3.7, shall be conducted within 24 hours after the non-compliance is detected. This additional monitoring  shall be continued until the excessive dust emission or the deterioration in air quality is rectified.                Dust monitoring by the ET under this Contact 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 by the Contractor, RE, IEC that the ET under this Contract could make use of the impact air quality monitoring data collected by the ET under HY/2012/08.

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. Table 3.3 shows the method of derviating the air quality criteria, namely Action and Limit levels to be used while Table 3.3a shows the air quality criteria. Should non-compliance with the air quality criteria occur, the ET, the IEC and the ER and the Contractor shall undertake their specified actions in accordance with the Action Plan shown in Table 3.4.

Table 3.3  Action and Limit Levels for Air Quality




24 Hour TSP Level in


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 (g/m³)

Limit Level (g/m³)

24-hour TSP (g/m3)




















1-hour TSP ((g/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 summarised 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 minimise 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 minimised 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



ET (a)

IEC (a)

ER (a)


Action Level

Exceedance recorded

1.        Identify the source.

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

3.        Inform the IEC and the ER.

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 exceedancecontinues, arrangemeetingwiththe IEC andthe  ER.

8.        If exceedancestops, ceaseadditionalmonitoring.

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 ER on the effectiveness of the proposed remedial measures.

5.        Supervise 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

5.       Amend proposal if appropriate



ET (a)

IEC (a)

ER (a)


Limit Level

Exceedance recorded

1.       Identify the source.

2.       Repeat measurement to confirm finding. If two consecutive measurements exceed Limit Level, the exceedance is then confirmed.

3.       Inform the IEC, the ER, the DEP and the Contractor.

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.       Carry out analysis of the Contractor’s working procedures to determine possible mitigation to be implemented.

7.       Arrange meeting with the IEC and the ER to discuss the remedial actions to be taken.

8.       Assess effectiveness of the Contractor’s remedial actions and keep the IEC, the DEP and the ER informed of the results.

9.       If exceedance stops, cease additional monitoring.

1.       Check monitoring data submitted by the ET.

2.       Check 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 ER on the effectiveness of the proposed remedial measures.

5.       Supervise implementation of remedial measures.

1.       Confirm receipt of notification of failure in writing.

2.       Notify the Contractor.

3.       If the exceedance is confirmed to be Project related after investigation, in consultation with the IEC, agree with the Contractor on the remedial measures to be implemented.

4.       Ensure remedial measures are properly implemented.

5.       If exceedance continues, consider what activity of the work is responsible and instruct the Contractor to stop that activity of work until the exceedance is abated.

1.       Take immediate action to avoid further exceedance.

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

3.       Implement the agreed proposals.

4.       Amend proposal if appropriate.

5.       Stop the relevant activity of works as determined by the ER until the exceedance is abated.



Note: (a)    ET – Environmental Team; IEC – Independent Environmental Checker; ER – Engineer’s Representative

4                              Noise

4.1                          Introduction             The TM-CLKL EIA study concluded that no existing noise sensitive receiver (NSR) has been identified within the Study Area, and no planned NSR has been identified from the Project Site.  Based upon this, no noise monitoring is necessary for either the construction or operation phases.             Regular site inspections and audits will be carried out during the construction phase in order to confirm compliance with the regulatory requirements and conformity of the Contractor with regard to noise control and contract conditions.

4.2                          Noise Mitigation Measures

As no impacts are predicted during the construction stage at the existing NSRs in Tuen Mun, no specific mitigation measures have been recommended. However, the Contractor will be responsible for ensuring noise levels are minimized as far as possible through the application of good site practices, including maintenance of equipment.  During the operational phase, no mitigation is required.


5                              Water Quality

5.1                          Introduction             No marine works are present in this Contract.  As such, EM&A requirements for water quality are not applicable to the this Cotract.

5.2                          Mitigation Meaures                Not used                Prior to the commencement of the construction work, a detailed site drainage management plan should be submitted to EPD.  The plan should cover measures to minimize all potential water quality impact arising from the surface runoffs of all the related constructions.                The guidelines outlined in the Practice Note for Professional Persons (ProPECC), Construction Site Drainage (PN 1/94) should be adopted to control construction site runoff. Mitigation measures to minimise water quality impacts from construction site runoff and wastewater and sewage generated from construction activities are:

·               Provision of site drainage systems over the entire construction site with sediment control facilities. Regular inspection and maintenance of the site drainage systems are required to ensure proper and efficient operation at all times.

·               Sedimentation tanks or package treatment systems are required to treat the large amount of sediment-laden wastewater generated from foundation construction work, wheel washing, site runoff. Any construction activities that generate wastewater with high concentrations of SS should also be collected to these facilities for proper treatment prior to disposal. Treated wastewater can be reused for vehicle washing, dust suppression and general cleaning. Bentonite slurry used in bore-pile construction should be reconditioned and reused to minimise the disposal volume of the used slurry.

·               The construction programme should be properly planned to avoid soil excavation in rainy seasons. Exposed stockpiles of excavated soils or construction materials should be covered with tarpaulin or impervious sheets to avoid release of pollutants into the drainage channels.

·               Sewage generated from site toilets and canteen should be collected using a temporary storage system. Chemical toilets should be provided at different locations for use by the workers on site. Licensed waste collectors should be employed for collection and disposal of the sewage. The drainage system for collection of wastewater generated from canteen, if any, should be equipped with grease trap capable of providing at least 20 minutes retention during peak flow.

·               Wheel washing facilities should be installed at all site entrances/exits.

·               Not used.                Upon completion of the TM-CLKL / HKLR / HKBCF development, stormwater drainage systems would be completed to collect stormwater generated from the whole area including new roads.                Not used.                The EIA Report has recommended construction and operational phase mitigation measures. All the prepared mitigation measures are summarised in the Environmental Mitigation Implementation Schedules in Appendix A.


6                              Ecology

6.1                          Introduction             Ecological resources are not identified within the works area of this Contract.  As such, EM&A requirements for ecology are not relevant to this Cotract.


7                              LANDSCAPE AND VISUAL ASSESSMENT

7.1                          Introduction                The EIA has recommended landscape and visual mitigation measures to be undertaken during both the construction and operational phases of the project. This section outlines the monitoring and audit of these measures.                The sensitive receivers are shown in Figure -7.1.13,, and

7.2                          Relevant Legislation                The following legislation, standards and guidelines are applicable to landscape and visual impact assessment associated with the construction and operation of the project:

·              Environmental Impact Assessment Ordinance (Cap.499.S.16) and the Technical Memorandum on EIA Process (EIAO TM), particularly Annexes 10 and 18

·              Environmental Impact Assessment Ordinance Guidance Note 8/2002

·              ETWB No. 36/ 2004 - Advisory Committee on the Appearance of Bridges and Associated Structures (ACABAS)

·              ETWB TCW No. 10/2005 - Planting on Footbridges and Flyovers

·              ETWB TCW No. 2/2004 - Maintenance of Vegetation and Hard Landscape Features

·              ETWB TCW No. 29/2004 - Registration of Old and Valuable Trees, and Guidelines for their Preservation

·              ETWB TCW No. 3/2006 - Tree Preservation

·              ETWB TCW No. 5/2005 on Protection of natural streams/rivers from adverse impacts arising from construction works

·              Hong Kong International Airport Approved Plant Species List (Revision 3: June 2007)

·              Hong Kong Planning Standards and Guidelines, particular Chapter 4, Chapter 8, Chapter 10 and Chapter 11

·              HQ/GN/13 - Interim Guidelines for Tree Transplanting Works under Highways Department’s Vegetation Maintenance Ambit

·              HyDTC No. 3/2008 - Independent Vetting of Tree Works under the Maintenance of Highways Department

·              HyDTC No. 5/2000 on Control in the Use of Shotcrete (Sprayed Concrete) in Slope Works

·              Protection of Endangered Species of Animals And Plants Ordinance (Cap 586)

·              Study on Landscape Value Mapping of Hong Kong

·              Town Planning Ordinance (Cap 131)

·              WBTC No. 17/2000 on Improvement to the Appearance of Slopes

·              WBTC No. 25/92 - Allocation of Space for Urban Street Trees

·              WBTC No. 25/93 on Control of Visual Impact of Slopes

·              WBTC No. 7/2002 - Tree Planting in Public Works

7.3                          Methodology and Criteria                The design, implementation and maintenance of landscape and visual mitigation measures should be checked to ensure that they are fully realised and that potential conflicts between the proposed landscape measures and any other project works and operational requirements are resolved at the earliest possible date and without compromise to the intention of the mitigation measures.                Site inspection and audit is necessary in the operation stage.

Table 7.1     Monitoring Programme


Monitoring Task

Monitoring Report

Form of Approval



Monitoring of design works against the recommendations of the landscape and visual impact assessments within the EIA should be undertaken during detailed design and tender stages, to ensure that they fulfil the intentions of the mitigation measures. Any changes to the design, including design changes on site should also be checked.

Report by ER confirming that the design conforms to requirements  of EP

Approved by Client

At Completion of Design     Stage


Monitoring of the contractor’s operations during the construction period.

Report on Contractor's compliance by ET

Counter- signature of report by IEC


Establishment  Works

Monitoring of the planting works during the 24-month Establishment period after completion of the construction works.

Report on Contractor's compliance by ET

Counter- signature of report by IEC

3 months



Design Phase                The mitigation measures proposed within the EIA to mitigate the landscape and visual impacts of the scheme should be embodied into the detailed engineering design and landscape design drawings and contract documents. Detailed landscaping drawings and specification should be checked during detailed design stage and before tender stage by a Registered Landscape Architect to ensure that the measures are fully incorporated and that potential conflicts with civil engineering, geo-technical, structural, lighting, signage, drainage, underground utility and operational requirements are resolved prior to construction. Monitoring of design works against the recommendations of the landscape and visual impact assessments within the EIA should be undertaken when the designs are produced to ensure that they fulfil the intentions of mitigation measures.

Construction & Establishment Period                The implementation of landscape construction works and subsequent maintenance operations during the 12-month establishment period must be supervised by fully qualified Landscape Resident Site Staff (Registered Landscape Architect or Professional Member of the Hong Kong Institute of landscape Architects).                Measures to mitigate landscape and visual impacts during construction should be checked and monitored by a Registered Landscape Architect to ensure compliance with the intended aims of the mitigation measures.                The progress of the engineering works shall be regularly reviewed on site to identify the earliest practical opportunities for the landscape works to be undertaken.

7.4                          Baseline Monitoring                Not used.

7.5                          Event and Action Plan                Should non-compliance of the landscape and visual impacts  occur,  actions  in accordance with the action plan stated in Table 7.2 should be carried out.

                        Table 7.2        Event and Action Plan for Landscape and Visual Impact







Design       Check

·   Check final design conforms to the

Requirements of EP and prepare report.

·   Check report.

·   Recommend remedial design if necessary

·   Undertake remedial design if necessary


Non- conformity on one


·   Identify Source

·   Inform IEC and ER

·   Discuss remedial actions with IEC, ER and   Contractor

·   Monitor remedial actions until rectification has been completed

·   Check report

·   Check Contractor's working method

·   Discuss with ET and Contractor on possible remedial measures

·   Advise ER on effectiveness of proposed remedial measures.

·   Check implementation of remedial  measures.

·   Notify Contractor

·   Ensure remedial measures are properly implemented

·   Amend working methods

·   Rectify damage and undertake any necessary replacement

Repeated Non- conformity

·   Identify source

·   Inform IEC and ER

·   Increase monitoring frequency

·   Discuss remedial actions with IEC, ER and Contractor

·   Monitor remedial actions until rectification has been completed

·   If non- conformity stops, cease additional monitoring

·   Check monitoring report

·   Check Contractor's working method

·   Discuss with ET and Contractor on possible   remedial measures

·   Advise ER on effectiveness of proposed remedial measures

·   Supervise implementation of remedial  measures.

·   Notify Contractor

·   Ensure remedial measures are properly implemented

·   Amend   working methods

·   Rectify damage and undertake any necessary replacement



7.6                          Mitigation Measures                The landscape and visual impact assessment of the EIA recommends a series on mitigation measures, as noted below:

Design Landscape and Visual Mitigation Measures

·         The colour and shape of the toll control buildings, ventilation building and administration building shall adopt a design which could blend it into the vicinity elements, and the details will be developed in detailed design stage (DM2),

·         Details of the street furniture will be developed in the detailed design stage (DM4).

Landscape and Visual Mitigation Measures during Construction Phase

·         Hydroseeding or sheeting of soil stockpiles with visually unobtrusive material (in earth tone) (CM4),

·         Screening of construction works by hoardings around works area in visually unobtrusive colours, to screen works (CM5),

·         Control night-time lighting and glare by hooding all lights (CM6),

·         Ensure no run-off into water body adjacent to the Project Area (CM7),

·         Avoidance of excessive height and bulk of buildings and structures (CM8),

·         Compensatory tree planting shall be provided to the satisfaction of relevant Government departments. Required numbers and locations of compensatory trees shall be determined and agreed separately with Government during the Tree Felling Application process under ETWBTC 3/2006 (CM10).

Landscape and Visual Mitigation Measures during Operation Phase

·         Tall buffer screen tree / shrub / climber planting should be incorporated to soften hard engineering structures and facilities (OM2),

·         Streetscape elements (e.g. paving, signage, street furniture, lighting etc.) shall be sensitively designed in a manner that responds to the local context, and minimises potential negative landscape and visual impacts. Lighting units should be directional and minimise unnecessary light spill (OM3),

·         Aesthetically pleasing design (visually unobtrusive and non-reflective) as regard to the form, material and finishes shall be incorporated to all buildings, engineering structures and associated infrastructure facilities (OM5),

·         Avoidance of excessive height and bulk of buildings and structures (OM6).



8                              Waste Management and Contaminated Land

8.1                          Waste Issues

8.1.1                     Summary of Waste Arisings                The Contractor is responsible for waste control within the construction site, removal of waste material produced from the site and to implement any mitigation measures to minimise waste or redress problems arising from the waste from the site. Activities during the construction phase will result in the generation of a variety of wastes which can broadly be classified into distinct categories based on their nature and the options for their disposal. These include:

Ÿ   Excavated construction and demolition (C&D) materials suitable for public fill;

Ÿ   Costruction and demolition waste, including cleared vegetation which is not suitable for public fill;

Ÿ   Chemical waste;

Ÿ   Sewage; and

Ÿ   General refuse.                Not used.                Not used.                Not used.                The Construction and Demolition (C&D) materials generated from the this Contract will comprise the following:

·            Excavation of reclamation materials for cut and cover tunnel, portal and ventilation building;

·            Excavation materials from the slope cutting and administration buildings formation.                Not used.                Not used.                The volumes C&D waste are expected to be limited but the material not suitable as public fill will require disposal to landfill. It is also unlikely that any large quantities of chemical wastes will be generated during the construction of this project but any materials should be handled, stored, transported and disposed of in an appropriate manner. Other wastes including sewage and general refuse will be generated and these will also need to be collected and disposed of offsite appropriately.

8.1.2                     Mitigation Measures                Based on the mitigation measures recommended in the EIA Report, the following measures, as summarized in the Environmental Mitigation Implementation Schedule in Appendix A, shall be undertaken when handling waste material during construction phase:

(i)                The requirements as stipulated in the ETWB TC(W) No.19/2005 Environmental Management on Construction Sites and the other relevant guidelines should be included in the Particular Specification for the Contractor as appropriate.

(ii)              The TM-CLKL Contractor should be requested to submit an outline Waste Management Plan (WMP) prior to the commencement of construction work, in accordance with the ETWB TC(W) No.19/2005 so as to provide an overall framework of waste management and reduction. The WMP should include:

·         Waste management policy;

·         Record of generated waste;

·         Waste reduction target;

·         Waste reduction programme;

·         Role and responsibility of waste management team;

·         Benefit of waste management;

·         Analysis of waste materials;

·         Reuse, recycling and disposal plans;

·         Transportation process of waste products; and

·         Monitoring and action plan.

(iii)           The waste management hierarchy below should be strictly followed. This hierarchy should be adopted to evaluate the waste management options in order to maximise the extent of waste reduction and cost reduction. The records of quantities of waste generated, recycled and disposed (locations) should be properly documented.

(iv)            A trip-ticket system should be established in accordance with ETWB(W) 31/2004 and Waste Disposal (Charges for Disposal of Construction Waste) Regulation to monitor the disposal of public fill and solid wastes at public filling facilities and landfills, and to control fly-tipping. A trip- ticket system would be included as one of the contractual requirements for the Contractor to strictly implement. The Engineer would also regularly audit the effectiveness of the system.

(v)              A recording system for the amount of waste generated, recycled and disposed (locations) should be established. The future Contractor should also provide proper training to workers regarding the appropriate concepts of site cleanliness and waste management procedures, e.g. waste reduction, reuse and recycling all the time.

(vi)            The CEDD should be timely notified of the estimated spoil volumes to be generated and the Public Fill Committee should be notified and agreement sort on the disposal of surplus inert C&D materials e.g. good quality rock during detailed design of the TM-CLKL project. Wherever practicable, C&D materials should be segregated from other wastes to avoid contamination and to ensure acceptability at public filling areas or reclamation sites.

(vii)         The extent of cutting operation should be optimised where possible. Earth retaining structures and bored pile walls should be proposed to minimise the extent of cutting.

(viii)       Not used.

(ix)            Not used.

(x)              The surplus surcharge should be transferred to a fill bank.

(xi)            The site and surroundings shall be kept tidy and litter free.

(xii)         No waste shall be burnt on site.

(xiii)       Make provisions in contract documents to allow and promote the use of recycled aggregates where appropriate.

(xiv)        Prohibit the Contractor to dispose of C&D materials at any sensitive locations e.g. natural habitat,, etc. The Contractor should propose the final disposal sites in the EMP and WMP for approval before implementation.

(xv)          Stockpiled material shall be covered by tarpaulin and /or watered as appropriate to prevent windblown dust and surface run off.

(xvi)        Excavated material in trucks shall be covered by tarpaulins to reduce the potential for spillage and dust generation.

(xvii)     Wheel washing facilities shall be used by all trucks leaving the site to prevent transfer of mud onto public roads.

(xviii)   Standard formwork or pre-fabrication should be used as far as practicable so as to minimise the C&D materials arising. The use of more durable formwork or plastic facing for construction works should also be considered. The use of wooden hoardings should be avoided and metal hoarding should be used to facilitate recycling. Purchasing of construction materials should be carefully planned in order to avoid over-ordering and wastage.

(xix)        The Contractor should recycle as many C&D materials (this is a waste section) as possible on-site. The public fill and C&D waste should be segregated and stored in separate containers or skips to facilitate the reuse or recycling of materials and proper disposal. Where practicable, the concrete and masonry should be crushed and used as fill materials. Steel reinforcement bar should be collected for use by scrap steel mills. Different areas of the sites should be considered for segregation and storage activities.

(xx)          All falsework will be steel instead of wood.

(xxi)        Chemical waste producers should register with the EPD.  Chemical waste should be handled in accordance with the Code of Practice on the Packaging, Handling and Storage of Chemical Wastes as follows:

·         Suitable for the substance to be held, resistant to corrosion, maintained in good conditions and securely closed;

·         Having a capacity of <450L unless the specifications have been approved by the EPD; and

·         Displaying a label in English and Chinese according to the instructions prescribed in Schedule 2 of the Regulations.

·         Clearly labelled and used solely for the storage of chemical wastes;

·         Enclosed with at least 3 sides;

·         Impermeable floor and bund with capacity to accommodate 110% of the volume of the largest container or 20% by volume of  the chemical waste stored in the area, whichever is greatest;

·         Adequate ventilation;

·         Sufficiently covered to prevent rainfall entering (water collected within the bund must be tested and disposed of as chemical waste, if necessary); and

·         Incompatible materials are adequately separated.

(xxii)     Waste oils, chemicals or solvents shall not be disposed of to drain;

(xxiii)   Adequate numbers of portable toilets should be provided for on-site workers. Portable toilets should be maintained in reasonable states, which will not deter the workers from utilising them. Night soil should be regularly collected by licensed collectors.

(xxiv)   General refuse arising on-site should be stored in enclosed bins or compaction units separately from C&D and chemical wastes. Sufficient dustbins shall be provided for storage of waste as required under the Public Cleansing and Prevention of Nuisances By-laws. In addition, general refuse shall be cleared daily and shall be disposed of to the nearest licensed landfill or refuse transfer station. Burning of refuse on construction sites is prohibited.

(xxv)         All waste containers shall be in a secure area on hardstanding;

(xxvi)   Aluminum cans are usually collected and recovered from the waste stream by individual collectors if they are segregated and easily accessible. Separately labelled bins for their deposition should be provided as far as practicable.

(xxvii) Office wastes can be reduced by recycling of paper if such volume is sufficiently large to warrant collection. Participation in a local collection scheme by the Contractor should be advocated. Waste separation facilities for paper, aluminum cans, plastic bottles, etc should  be provided on-site.

(xxviii)  Training shall be provided to workers about the concepts of site cleanliness and appropriate waste management procedure, including waste reduction, reuse and recycling.

8.1.3                     Waste Disposal Recommendations


8.1.3                         The recommended disposal sites for the different types of waste are detailed in Table 8.1 below:

Table 8.1          Recommended Waste Disposal Sites

Type of Waste

Disposal Site

C&D materials

Tuen Mun Areas 38 public fill bank

C&D waste (plastics, glass, wood, including cleared vegetation etc.)

North Lantau Refuse Transfer Station; or NWNT Refuse Transfer Station

Chemical waste (as defined under Schedule 1 of the Waste Disposal (Chemical Waste) Regulation)

Chemical Treatment Facility at Tsing Yi: or

Other approved facility

General refuse

North Lantau Refuse Transfer Station; or NWNT Refuse Transfer Station

8.2                          Contaminated Land                The results of the contaminated land assessment did not reveal any contamination hotspots that might be affected by the proposed TM-CLKL works and as such no mitigation measures in the form of contaminated land remediation is required. Therefore, no EM&A activities for the construction nor operational phases have been recommended as no significant impacts are predicted.

8.3                          Waste EM&A Requirements                EM&A requirements are required for waste management during the construction phase only and the effective management of waste arisings during the construction phase will be monitored through the site audit programme. The aims of the waste audit are:

·                  to ensure the waste arising from the works are handled, stored, collected, transferred and disposed of in an environmentally acceptable manner; and

·                  to encourage the reuse and recycling of material.                The Contractor shall be required to pay attention to the environmental standard and guidelines and carry out appropriate waste management and obtain the relevant licence/permits for waste disposal. The Environmental Team (ET) shall ensure that the Contractor has obtained from the appropriate authorities the necessary waste disposal permits or licences including:

·                  Chemical Waste Permits/licenses under the Waste Disposal Ordinance (Cap 354);

·                  Public Dumping Licence under the Land (Miscellaneous Provisions) Ordinance (Cap 28);

·                  Marine Dumping Permit under the Dumping at Sea Ordinance (Cap 466); and

·                  Effluent Discharge Licence under the Water Pollution Control Ordinance.                The Contractor shall refer to the relevant booklets issued by the DEP when applying for the licence/permit and the Environmental Team (ET) (see Section 1) shall refer to these booklets for auditing purposes.                During the site inspections and the document review procedures as mentioned in Chapter 10 of this Manual, the ET shall pay special attention to the issues relating to waste management and check whether the Contractor has followed the relevant contract specifications and the procedures specified under the laws of Hong Kong. In addition to the site inspections, the ET shall review the documentation procedures prepared by the Waste Coordinator once a week to ensure proper records are being maintained and procedures undertaken in accordance with the Waste Management Plan.                The Contractor’s waste management practices should be audited with reference to the checklist detailed in Table 8.2 below:

Table 8.2  Waste Management Checklist




Monitoring Frequency

If non-compliance, Action Required

All necessary waste diposal permits or licences have been obtained

Before the commencement of demolition works


Apply for the necessary permits/ licenceses prior to disposal of the waste.  The ET shall ensure that corrective action has been taken.

Only licensed waste haulier are used for waste collection.

Throughout the works


The ET shall inform the ER  and IEC of the non- compliance. The ER shall instruct the Contractor to use a licensed waste haulier. The Contractor shall temporarily suspend waste collection of that particular waste until a licensed waste haulier is used. Corrective action shall be undertaken within 48 hours.

Records of quantities of wastes generated, recycled and disposed of are properly kept. For demolition material/waste, the number of loads for each day shall be recorded (Quantity of waste can then be estimated based on average truck load. Should landfill charging be implemented, the receipts of the charge could be used for estimating the quantity).

Throughout the works


The Contractor shall estimate the missing data based on  previous records and the activities carried out. The ET shall audit the results and forward to the ER and IEC for approval.

Wastes are removed from site in a timely manner. General refuse is collected on a daily basis.

Throughout the works


The ET shall inform the ER and IEC of the non- compliance. The ER shall instruct the Contractor to remove waste accordingly.

Waste storage areas are properly cleaned and do not cause windblown litter and dust nuisance.

Throughout the works


The ET shall inform the ER and IEC of the non- compliance. The ER shall instruct the Contractor to clean the storage area and/or cover the waste.

Different types of waste are segregated in different containers or skip to enhance recycling of material and proper disposal of waste.

Throughout the works


The ET shall inform the ER and IEC of the non- compliance. The ER shall instruct the Contractor to provide separate skips/ containers. The Contractor shall ensure the workers place the waste in the appropriate containers.

Chemical wastes are stored, handled and disposed of in accordance with the Code of Practice on  the Packaging, Handling and Storage of Chemical Wastes, published by the EPD.

Throughout the works


The ET shall inform the ER and IEC of the non-compliance.     The ER shall instruct the Contractor to rectify the problems immediately.  Warning shall be given to the    Contractor if corrective actions  are not taken within 24 hrs and the Waste Control Group of the EPD shall be identified.

Demolition material/waste in dump trucks are properly covered before leaving the site.

Throughout the works


The ET shall inform the ER and IEC of the non- compliance. The ER shall instruct the Contractor to comply. The Contractor shall prevent trucks leaving the site until the waste are properly covered.

Wastes are disposal of at licensed sites.

Throughout the works


The ET shall inform the ER and IEC of the non- compliance.  The ER shall warn the Contractor and instruct the Contractor to ensure the wastes are disposed of at the licensed sites. Should it involve chemical waste, the Waste Control Group of EPD shall be notified.

Note: ET Environmental Team, IEC Independent Environmental Checker, ER Engineer’s Representative



9                              Cultural heritage

9.1                          Introduction           Cultural heritage resources are not identified within the works area of this Contract.  As such, EM&A requirements for cultural heritage are not applicable to this Cotract.



10                           Landfill Gas HAzard Assessment

10.1                       Introduction            The landfill gas hazard assessment undertaken in the EIA identified the hazards that are likely to be generated from the Pillar Point Vallet (PPV) Landfill, during the construction and operation phases of this Project and evaluate the associated risk.  The EIA Report recommended that some precautionary measures are required to protect the proposed Tuen MunChek Lap Lok Link (TMCLKL) toll plaza from the landfill gass risk due to the PPV Landfill.  Use of “semi-active” or “enhanced passive” gas control protection system referenced from the EPD’s Landfill Gas Hazard Assessment Guidance Note were recommended.  Regular monitoring during construction and operation phases was also recommended.

10.2                       Monitoring and Measurement of Landfill Gas                 During construction, a Safety Officer should be appointed to carry out the monitoring works. The monitoring frequency and areas to be monitored should be set down prior to commencement of ground-works either by the Safety Officer or an approved and appropriated qualified person. The routine monitoring should be carried out in all excavations, manholes, chambers, relocation of monitoring wells and any other confined spaces that may have been created. All measurements in excavations should be made with the extended monitoring tube located not more than 10 mm from the exposed ground surface. Monitoring should be performed properly to make sure that the area is free of landfill gas before any man enters in the area.            For excavations deeper than 1m, measurements should be carried out:

Ÿ    At the ground surface before excavation commences;

Ÿ    Immediately before any worker enters the excavation;

Ÿ    At the beginning of each working day for the entire period the excavation remains open; and

Ÿ    Periodically through the working day whilst workers are in the excavation.            For excavations between 300mm and 1m deep, measurements should be carried out:

Ÿ    directly after the excavation has been completed; and

Ÿ    periodically whilst the excavation remains open            For excavations less than 300mm deep, monitoring may be omitted, at the discretion of the Safety Officer or other appropriately qualified person.            Depending on the results of the measurements, actions required will vary and should be set down by the Safety Officer or other appropriately qualified person. As a minimum these should encompass those actions specified as follow:

Table 10.1     Actions   in   the   Event   of   Landfill   Gas   being   Detected    in Excavation / Confined Area





< 19%

- Ventilate to restore oxygen to > 19%


< 18%

-  Stop work

-  Evacuate personnel / prohibit entry

-  Increase ventilation to restore to > 19%


> 10% LEL (>

0.5% v/v)

-  Prohibit hot work

-  Ventilate to restore methane to < 10% LEL


> 20% LEL

(>1% v/v)

-  Stop work

-  Evacuate personnel / prohibit entry

-  Increase ventilation to restore to < 10%

Carbon Dioxide

> 0.5%

- Ventilate to restore oxygen to < 0.5%


> 1.5%

-  Stop work

-  Evacuate personnel / prohibit entry

-  Increase ventilation to restore to < 0.5%            During operation, regular monitoring of landfill gas should be done at the tunnel, subway, and any other underground structures within the landfill consultation zone. Monitoring is required to verify the effectiveness and to ensure  the continued performance of the implemented protection measures.            Inspection and LFG monitoring should be carried out at buildings and enclosures (eg. toll control building, toll booths, tunnel, subway, service manholes, etc) prior to the operation to ensure the design measures and functioning properly. The monitoring should be continued through the operation of the Project. In particular for the first year of operation, monthly monitoring is recommended, and quarterly (or at a frequency agreed by EPD) for second year on. Should the monitoring reveal the presence of landfill gas within the tunnel, subway, or other confined area, the seal of the joints shall be inspected and consideration shall be given to seal the cracks. Action level can refer to Table 10.1, and should abnormality is observed, it should be reported to EPD and the PPV Landfill operator.            In addition, if any construction is required for the maintenance work during operation stage, the responsible party should follow the protective measures and monitoring works as recommended in Clause of this report.            The monitoring programme and detailed actions should be included in the detailed assessment (to be carried out in the designed design stage) and submitted to EPD for approval.

11                           Site Environmental Audit

11.1                       Site Inspections            Site inspections provide a direct means to assess and ensure the Contractor’s environmental protection and pollution control measures are in compliance with the contract specifications. Site inspections shall be undertaken routinely by the Environmental Team (ET) (see Section 1) to inspect the construction activities in order to ensure that appropriate environmental protection and pollution control mitigation measures are properly implemented in accordance with the EIA.            The ET is responsible for the formulation of an environmental site inspection, deficiency and remedial action reporting system and for carrying out the site inspection works. In consultation with the Independent Environmental Checker (IEC), the ET shall prepare a procedure for the site inspection, deficiency and remedial action reporting requirements and submit this to the Contractor for agreement and to the Engineer’s Representative (ER) for approval within 21 days of commencement to the construction contract.            Regular site inspections shall be carried out at least once per week. The areas of inspection shall not be limited to the site area and should also include the environmental conditions outside the site which are likely to be affected, directly or indirectly, by the site activities.