TABLE OF CONTENTS                             

Page

EXECUTIVE SUMMARY  1

1.      introduction  1

1.1     Background  1

1.2     Scope of Report 1

1.3     Contract Organization  2

1.4     Summary of Construction Works  2

2.      Summary of EM&A Programme Requirements  5

2.1     Monitoring Parameters  5

2.2     Environmental Quality Performance (Action/Limit Levels) 7

2.3     Environmental Mitigation Measures  7

3.      MONITORING Results  7

3.1     Air Quality Monitoring  7

3.2     Noise Monitoring  12

3.3     Water Quality Monitoring  15

3.4     Dolphin Monitoring  15

3.5     Environmental Site Inspection and Audit 35

3.5.1      Site Inspection  35

4.      Advice on the Solid and Liquid Waste Management Status  36

4.1     Summary of Solid and Liquid Waste Management 36

5.      Implementation Status of Environmental Mitigation Measures  36

5.1     Implementation Status of Environmental Mitigation Measures  36

6.      Summary of Exceedances of the Environmental Quality Performance Limit  37

6.1     Summary of Exceedances of the Environmental Quality Performance Limit 37

7.      Summary of Complaints, Notification of Summons and Successful Prosecutions  39

7.1     Summary of Environmental Complaints, Notification of Summons and Successful Prosecutions  39

8.      REVIEW of THE VALIDITY OF THE EIA Prediction  40

9.      Review of ENVIRONMENTAL IMPLEMENTATION STATUS  42

10.    Review of EM&A Programme  43

11.    Comments, recommendations and Conclusions  44

12.    Conclusions  46

 


 

List of Tables

 

Table 1.1        Contact Information of Key Personnel

Table 3.1        Summary of Number of Monitoring Events for 1-hr & 24-hr TSP Concentration

Table 3.2        Summary of Number of Exceedances for 1-hr & 24-hr TSP Monitoring

Table 3.3        Maximum Predicted TSP concentrations under the “Mitigated” scenario

Table 3.4        Summary of Number of Monitoring Events for Impact Noise

Table 3.5        Summary of Number of Monitoring Exceedances for Impact Noise

Table 3.6        Construction Noise Impact at Noise Sensitive Receivers

Table 3.7        Summary of Construction Noise Monitoring Results in the Reporting Period

Table 3.8        Summary of Number of Monitoring Events for Impact Water Quality

Table 3.9        Summary of Water Quality Exceedances in Mar 17 – Apr 18

Table 3.10      Summary of number of water quality exceedances per monitoring month

Table 3.11      Comparison of depth averaged dissolved oxygen levels (Surface & Mid-depth, Bottom depth) during baseline and impact monitoring period (mgL-1)

Table 3.12      Ambient and Tolerance Values for Suspended Sediment Concentrations (mgL-1) in the Vicinity of Sensitive Receivers adopted in the EIA

Table 3.13          Calculated Elevations in Suspended Sediment Concentrations at Sensitive Receivers (mgL-1) under the 2012 mitigated scenario from the EIA

Table 3.14      Baseline suspended solids levels and 30% of baseline mean (mgL-1)

Table 3.15      Average suspended solids levels at sensitive receivers (mgL-1) in November 2014

Table 3.16    Summary of the STG/ANI Quarterly Values

Table 3.17    Summary of All Dolphin Impact Monitoring Sightings from Year 1 (March 2012 – February 2013) to the Year 6 (Mar 2017 – August 17) of the HKBCF Reclamation Works Project

Table 3.18   Comparison of low, moderate and high habitat utilisation in NEL and NWL between advanced and impact monitoring (in %)

Table 3.19 Dolphins Frequently Recorded During Impact Monitoring Surveys

 

Figures

 

Figure 1         General Contract Layout Plan

Figure 2a-2e  Impact Air Quality and Noise Monitoring Stations and Wind Station

Figure 3a-3f   Impact Water Quality Monitoring Stations

Figure 4a-4d  Impact Dolphin Monitoring Line Transect Layout Map

Figure 5         Environmental Complaint Handling Procedure


List of Appendices

 

Appendix A       Contract Organization for Environmental Works

Appendix B       Three Month Rolling Construction Programmes

Appendix C       Implementation Schedule of Environmental Mitigation Measures (EMIS)

Appendix D       Summary of Action and Limit Levels

Appendix E       Graphical Presentation of Impact Air Quality Monitoring Results

Appendix F       Graphical Presentation of Impact Daytime Construction Noise Monitoring Results

Appendix G       Graphical Presentation of Impact Water Quality Monitoring Results

Appendix H       Impact Dolphin Monitoring Survey Findings and Analysis

Appendix I        Summary of Waste Flow Table

Appendix J        Cumulative Statistics on Exceedances, Complaints, Notifications of Summons and Successful Prosecutions

Appendix K        Event Action Plan

 

 


EXECUTIVE SUMMARY

Contract No. HY/2010/02 – Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities – Reclamation Works (here below, known as “the Contract”) mainly comprises reclamation at the northeast  of  the  Hong  Kong  International  Airport  of  an  area  of  about  130-hectare  for  the construction of an artificial island for the development of the Hong Kong Boundary Crossing Facilities (HKBCF), and about 19-hectare for the southern landfall of the Tuen Mun - Chek Lap Kok Link (TMCLKL). It is a designated Project and is governed by the current permits for the Project, i.e. the amended Environmental Permits (EPs) issued on 11 April 2016 (EP-353/2009/K) and 13 March 2015 (EP-354/2009/D) (for TMCLKL Southern Landfall Reclamation only).

Ove Arup & Partners Hong Kong Limited (Arup) was appointed by Highways Department (HyD) as the consultants for the design and construction assignment for the Project’s reclamation works (i.e. the Engineer for the Contract).

China Harbour Engineering Company Limited (CHEC) was awarded by HyD as the Contractor to undertake the construction work of the Contract.

Ramboll Hong Kong Ltd. was employed by HyD as the Independent Environmental Checker (IEC) and Environmental Project Office (ENPO) for the Project.

AECOM Asia Co. Ltd. (AECOM) was appointed by CHEC to undertake the role of Environmental Team for the Contract for carrying out the environmental monitoring and audit (EM&A) works.

The construction phase of the Contract under the EPs was commenced on 12 March 2012 and will be tentatively completed by early Year 2018. The EM&A programme, including air quality, noise, water quality and dolphin monitoring and environmental site inspections, was commenced on 12 March 2012.

As informed by the Contractor, major activities in the reporting period were:-

Marine-base

-          Additional GI installation

-          Backfill cellular structure

-          Band drain installation

-          Capping Beams structures

-          Cellular structure (capping beams, connecting arcs, installation & backfilling)

-          Cone penetration test;

-          Conforming sloping seawalls

-          Connecting arc cell installation

-          Construction of cellular structure

-          Construction of conveyors for public fill

-          Construction of temporary jetties for surcharge laying

-          Construction of temporary pier at Portion A

-          Construction of temporary seawall

-          Deep Cement Mixing

-          Earthwork fill

-          Flat barge of unloading public fill for surcharge laying

-          Geotechnical Instrumentation works

-          Geotextile laying and fabrication;

-          Ground investigation

-          Installation of silt screen at sea water intake of HKIA

-          Installations of Precast Culverts except sloping outfalls

-          Instrumentation works

-          Jet grout columns works

-          Laying geo-textile

-          Laying stone blanket

-          Maintenance of Silt curtain

-          Maintenance of silt curtain & silt screen at sea water intake of HKIA

-          Optimizing rubble mound seawalls

-          Outfall installation

-          Portion D Construction of Access to Portion A

-          Precast Yard for seawall blocks & culverts

-          Precast Yard setup

-          Public filling

-          Reinstatement of seawall

-          Removal of Temporary Seawall

-          Rock filling

-          Rubble Mound Seawall

-          Sand blanket laying

-          Sand blanket trial

-          Sand filling

-          Seawall blocks for temporary construction

-          Silt curtain deployment and repairing

-          Silt curtain fabrication and deployment; and

-          Sloping Seawalls

-          Stone blankets laying.

-          Stone column installation and installation trial

-          Surcharge laying and removal

-          Temporary bridge at Portion D

-          Temporary Watermain construction along access at Portion D

-          Vibro-compaction on surcharge

-       Maintenance of silt curtain & silt screen at sea water intake of HKIA (As informed by the           Contractor, the silt curtain at NE Airport Cooling Water   Intake has been removed on 10 May 2016.)

 

Land-base

-          Constructing site access at Works Area WA2 to Ying Hei Road, Tung Chung;

-          Construction of Permanent Seawall

-          Construction of Sloping Outfalls

-          Construction of Temporary Marine Access at Works Area WA2

-          Deep Cement Mixing

-          Drainage works at Works Area WA2 and WA3;

-          Earthwork fill

-          Erection of site office for CHEC(GD) at Works Area WA2

-          Geotechnical Instrumentation Works

-          Geotextile fabrication at Works Area WA2 and WA4; and

-          Green roof construction at Works Area WA2

-          Hoarding erection at Work Areas Portion D and Works Area WA2

-          Installations of Precast Culverts except sloping outfalls

-          Installed sand bag at Works Area WA2

-          Jet grout columns works

-          Maintenance of Temporary Marine Access at Works Area WA2

-          Maintenance works of Public Works Regional Laboratory at Works Area WA3

-          Maintenance works of Site Office at Works Area WA2

-          Public Works Regional Laboratory erection and construction at Works Area WA3;

-          Removal of Temporary Seawall

-          Sign board erection at Works Area WA2

-          Silt curtain fabrication at Works Area WA2 and WA4;

-          Site office erection and construction at Works Area WA2;

-          Stone column installation barges setup and their maintenance works at Works Area WA4.

-          Surcharge removal  & laying

-          Vertical Band Drains

 

A summary of monitoring and audit activities conducted in the reporting period* is listed below:

24-hour Total Suspended Particulates (TSP) monitoring

1-hour TSP monitoring

352 sessions

352 sessions

Noise monitoring

281 sessions

Impact water quality monitoring

846 sessions

Impact dolphin monitoring

132 surveys

Joint Environmental site inspection

319 sessions

 

*monitoring works between September 2017 and April 2018 for the Contract are covered by Contract No. HY/2013/01 Hong Kong-Zhuhai Macao Bridge HKBCF –Passenger Clearance Building.

 

Breaches of Action and Limit Levels for Air Quality

 

A total of 25 Action Level exceedances and 10 Limit Level exceedances were recorded during the 24-hr TSP impact monitoring in the reporting period. 4 Action Level exceedances of 24-hr TSP were recorded Contract No. HY/2013/01 and the rest of the exceedances were recorded by this Contract. No action level or limit level exceedance of 1-hour TSP monitoring at all impact air quality monitoring station the reporting period. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports. For level of exceedance, location and when exceedances were recorded, please refer to relevant monthly EM&A report. Investigation results confirm that the exceedances were not related to the activities of this Contract. No other 1-hour and 24-hour action and limit level exceedances was recorded at all monitoring stations in the reporting period.

Breaches of Action and Limit Levels for Noise

1 Limit Level exceedance of impact noise monitoring was recorded in June 2012. No exceedance of impact noise monitoring was recorded by Contract No. HY/2013/01 and all exceedances were recorded by this Contract. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports. Investigation results show that the exceedance was not due to the Project works. The Contractor was recommended to continue implementing existing noise mitigation measures. 1 noise complaint was received in October 2012 and therefore 1 Action Level Exceedance of construction noise was recorded in October 2012. Investigation into the possible causes of such exceedance was undertaken and reported in the respective monthly EM&A reports, the investigations results confirmed that the action and limit level exceedance were not related to Contract. No other exceedance was recorded at all monitoring stations in the reporting period.

Breaches of Action and Limit Levels for Water Quality

297 Action Level exceedances and 27 Limit Level exceedances were recorded during the reporting period.  After investigation, all impact water quality exceedances were considered not related to this Contract except the Action Level Exceedance recorded at SR5 and Limit Level Exceedance recorded at  IS10 on 18 Dec 13 were related to Contract.  For details of investigation please refer to monthly EM&A Report of this Contract. The exceedances note at IS10 and SR5 on 18 Dec 13 were considered as Contract related. The silt curtain integrity checking record on 4 January 14 shows that the disconnected silt curtain observed on 18 Dec 13 at northwest of HKBCF were rectified and the Contractor was further reminded to ensure provision of ongoing maintenance to the silt curtains and to carry out maintenance work once defects were found. For details of investigation please refer to monthly EM&A Report December 2013; the Limit Level Exceedance of Turbidity and Limit Level Exceedance of Suspended Solids recorded at IS17 during ebb tide on 10 October 2014 and Action Level Exceedance of Suspended Solids recorded at IS17 during flood tide on 20 October 2014, which were considered related to this Contract. Recommendation has been given and rectification has been carried on by the Contractor on 28 October 2014. As rectification was provided by the Contractor and recurrence of Contract related exceedance was not observed in the subsequent monitoring events.

Triggering of Event and Action Plan for Impact Dolphin Monitoring

15 Limit level exceedances and 6 Action level exceedances were recorded in the reporting period for impact dolphin monitoring. After investigation, it was concluded that the HZMB works is one of the contributing factors affecting the dolphins. It was also concluded the contribution of impacts due to the HZMB works as a whole (or individual marine contracts) cannot be quantified nor separate from the other stress factors. Event Action Plan for Impact Dolphin Monitoring was triggered. For investigation results please refer to Appendix L of the corresponding quarterly reports.

Impact dolphin monitoring results obtained between September 2017 and April 2018, at all transects are reported in the EM&A Report prepared for Contract No. HY/2013/01.

Implementation Status and Review of Environmental Mitigation Measures

Most of the recommended mitigation measures, as included in the EM&A programme, were implemented properly in the reporting period. The recommended environmental mitigation measures effectively minimize the potential environmental impacts from the Contract.

Changes of EM&A programme such as conditional omission of air monitoring station (AMS 6) for this Contract; relocation of air quality monitoring station, relocation of construction noise monitoring station, impact water quality monitoring stations, alternation of the transect lines of dolphin monitoring were carried out during the reporting period. For background proposal date and approval date of each changes of the EM&A programme, please refer to the corresponding annual EM&A review report of this contract.

Overall, the EM&A programme effectively monitored the environmental impacts from the construction activities and ensure the proper implementation of mitigation measures. No particular recommendation was advised for the improvement of the programme. .

Moreover, regular review and checking on the construction methodologies, working processes and plants were carried out to ensure the environmental impacts were kept minimal and recommended environmental mitigation measures were implemented effectively.

Complaint, Notification of Summons and Successful Prosecution

48 environmental complaints were received in the reporting period.

2 summonses and 2 successful prosecutions were received in the reporting period.


1.               introduction

1.1             Background

1.1.1        Contract No. HY/2010/02 – Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities – Reclamation Work (here below, known as “the Contract”) mainly comprises reclamation at the northeast  of  the  Hong  Kong  International  Airport  of  an  area  of  about  130-hectare  for  the construction of an artificial island for the development of the Hong Kong Boundary Crossing Facilities (HKBCF), and about 19-hectare for the southern landfall of the Tuen Mun - Chek Lap Kok Link (TMCLKL).

1.1.2        The  environmental  impact  assessment  (EIA)  reports  (Hong  Kong    Zhuhai    Macao  Bridge Hong Kong Boundary Crossing Facilities – EIA Report (Register No. AEIAR-145/2009) (HKBCFEIA) and Tuen Mun – Chek Lap Kok Link – EIA Report (Register No. AEIAR-146/2009) (TMCLKLEIA), and their environmental monitoring and audit (EM&A) Manuals (original EM&A Manuals), for the Project were approved by Environmental Protection Department (EPD) in October 2009. 

1.1.3        EPD  subsequently  issued  the  Environmental  Permit  (EP) for HKBCF in November 2009 (EP-353/2009) and the Variation of Environmental Permit (VEP) in June 2010 (EP-353/2009/A),  November  2010  (EP-353/2009/B), November  2011  (EP-353/2009/C), March 2012 (EP-353/2009/D), October 2012 (EP-353/2009/E), April 2013 (EP-353/2009/F), August 2013 (EP-353/2009/G), January 2015 (EP-353/2009/H), July 2015 (EP-353/2009/I), February 2016 (EP-353/2009/J) and April 2016 (EP-353/2009/K). Similarly, EPD issued the Environmental Permit (EP) for TMCLKL in November 2009 (EP-354/2009) and the Variation of Environmental Permit (VEP) in December 2010 (EP-354/2009/A), January 2014 (EP-354/2009/B), December 2014 (EP-354/2009/C) and March 2015 (EP-354/2009/D).

1.1.4        The Project is a designated Project and is governed by the current permits for the Project, i.e. the amended EPs issued on 11 April 2016 (EP-353/2009/K) and 13 March 2015 (EP-354/2009/D) (for TMCLKL Southern Landfall Reclamation only).

1.1.5        A Contract Specific EM&A Manual, which included all Contract-relation contents from the original EM&A Manuals for the Contract, was issued in May 2012.

1.1.6        Ove Arup & Partners Hong Kong Limited (Arup) was appointed by Highways Department (HyD) as the consultants for the design and construction assignment for the Project’s reclamation works (i.e. the Engineer for the Contract).

1.1.7        China Harbour Engineering Company Limited (CHEC) was awarded by HyD as the Contractor to undertake the construction work of the Contract.

1.1.8        Ramboll Hong Kong Limited. was employed by HyD as the Independent Environmental Checker (IEC) and Environmental Project Office (ENPO) for the Project.

1.1.9        AECOM Asia Co. Ltd. (AECOM) was appointed by CHEC to undertake the role of Environmental Team for the Contract for carrying out the EM&A works.

1.1.10     The construction phase of the Contract under the EPs was commenced on 12 March 2012 and will be tentatively completed by early Year 2018.

1.1.11     According to the Contract Specific EM&A Manual, there is a need of an EM&A programme including air quality, noise, water quality and dolphin monitoring and environmental site inspections. The EM&A programme of the Project commenced on 12 March 2012.

1.3             Scope of Report

1.3.1        This is the Final EM&A Review Report under the Contract No. HY/2010/02 Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities – Reclamation Works. This report presents a summary of the environmental monitoring and audit works, list of activities and mitigation measures proposed by the ET for the Contract from 12 March 2012 and 30 April 2018.


1.4             Contract Organization

1.4.1        The Contract organization structure is shown in Appendix A. The key personnel contact names and numbers are summarized in Table 1.1.

  Table 1.1          Contact Information of Key Personnel

Party

Position

Name

Telephone

Fax

Engineer’s Representative (ER)

(Ove Arup & Partners Hong Kong Limited)

Senior Resident Engineer

Seven Yau

 

3698 5850

 

2698 5999

IEC / ENPO

 (Ramboll Hong Kong Limited)

Independent Environmental Checker

Ray Yan

3465 2836

3465 2899

Environmental Project Office Leader

Y. H. Hui

3456 2850

3465 2899

Contractor

 

(China Harbour Engineering Company Limited)

Environmental Officer

Louie Chan

36932254

2578 0413

24-hour Hotline

Alan C.C. Yeung

9448 0325

--

ET

(AECOM Asia Company Limited)

ET Leader

Echo Leong

3922 9280

   2317 7609

 

1.5             Summary of Construction Works

1.4.1        The construction phase of the Contract under the EP commenced on 12 March 2012.

1.4.2        As informed by the Contractor, details of the major works carried out in the reporting period are listed below:-

Marine-base

 

-          Additional GI installation

-          Backfill cellular structure

-          Band drain installation

-          Capping Beams structures

-          Cellular structure – (capping beams, connecting arcs, installation & backfilling)

-          Cone penetration test;

-          Conforming sloping seawalls

-          Connecting arc cell installation

-          Construction of cellular structure

-          Construction of conveyors for public fill

-          Construction of temporary jetties for surcharge laying

-          Construction of temporary pier at Portion A

-          Construction of temporary seawall

-          Deep Cement Mixing

-          Earthwork fill

-          Flat barge of unloading public fill for surcharge laying

-          Geotechnical Instrumentation works

-          Geotextile laying and fabrication;

-          Ground investigation

-          Installation of silt screen at sea water intake of HKIA

-          Installations of Precast Culverts except sloping outfalls

-          Instrumentation works

-          Jet grout columns works

-          Laying geo-textile

-          Laying stone blanket

-          Maintenance of Silt curtain

-          Maintenance of silt curtain & silt screen at sea water intake of HKIA

-          Optimizing rubble mound seawalls

-          Outfall installation

-          Portion D Construction of Access to Portion A

-          Precast Yard for seawall blocks & culverts

-          Precast Yard setup

-          Public filling

-          Reinstatement of seawall

-          Removal of Temporary Seawall

-          Rock filling

-          Rubble Mound Seawall

-          Sand blanket laying

-          Sand blanket trial

-          Sand filling

-          Seawall blocks for temporary construction

-          Silt curtain deployment and repairing

-          Silt curtain fabrication and deployment; and

-          Sloping Seawalls

-          Stone blankets laying.

-          Stone column installation

-          Stone column installation trial;

-          Surcharge laying and removal

-          Temporary bridge at Portion D

-          Temporary Watermain construction along access at Portion D

-          Vibro-compaction on surcharge

-          Maintenance of silt curtain & silt screen at sea water intake of HKIA (As informed by the Contractor, the silt curtain at NE Airport Cooling Water   Intake has been removed on 10 May 2016.)

 

Land-base

-          Constructing site access at Works Area WA2 to Ying Hei Road, Tung Chung;

-          Construction of Permanent Seawall

-          Construction of Sloping Outfalls

-          Construction of Temporary Marine Access at Works Area WA2

-          Deep Cement Mixing

-          Drainage works at Works Area WA2 and WA3;

-          Earthwork fill

-          Erection of site office for CHEC(GD) at Works Area WA2

-          Geotechnical Instrumentation Works

-          Geotextile fabrication at Works Area WA2 and WA4; and

-          Green roof construction at Works Area WA2

-          Hoarding erection at Work Areas Portion D and Works Area WA2

-          Installations of Precast Culverts except sloping outfalls

-          Installed sandbag at Works Area WA2

-          Jet grout columns works

-          Maintenance of Temporary Marine Access at Works Area WA2

-          Maintenance works of Public Works Regional Laboratory at Works Area WA3

-          Maintenance works of Site Office at Works Area WA2

-          Public Works Regional Laboratory erection and construction at Works Area WA3;

-          Removal of Temporary Seawall

-          Sign board erection at Works Area WA2

-          Silt curtain fabrication at Works Area WA2 and WA4;

-          Site office erection and construction at Works Area WA2;

-          Stone column installation barges setup and their maintenance works at Works Area WA4.

-          Surcharge removal & laying

-          Vertical Band Drains

 

 

1.4.3        The construction programme of the Contract is shown in Appendix B.

1.4.4        The general layout plan of the Contract site showing the detailed works areas is shown in Figure 1.

1.4.5        The environmental mitigation measures implementation schedule are presented in Appendix C.

 


2.                Summary of EM&A Programme Requirements

2.1             Monitoring Parameters

2.1.1     The Contract Specific EM&A Manual designated 4 air quality monitoring stations, 2 noise monitoring stations, 21 water monitoring stations (9 Impact Stations, 7 Sensitive Receiver Stations and 5 Control/Far Field Stations) to monitor environmental impacts on air quality, noise and water quality respectively. Pre-set and fixed transect line vessel-based dolphin survey was required in two AFCD designated areas (Northeast and Northwest Lantau survey areas). The impact dolphin monitoring at each survey area should be conducted twice per month.

2.1.2     For impact air quality monitoring, monitoring locations AMS2 (Tung Chung Development Pier) and AMS7 (Hong Kong SkyCity Marriott Hotel) were set up at the proposed locations in accordance with Contract Specific EM&A Manual. The conditional omission of Monitoring Station AMS6 was effective since 19 November 2012. For monitoring location AMS3 (Ho Yu College), as proposed in the Contract Specific EM&A Manual, approval for carrying out impact monitoring could not be obtained from the principal of the school. Permission on setting up and carrying out impact monitoring works at nearby sensitive receivers, like Caribbean Coast and Coastal Skyline, was also sought.  However, approvals for carrying out impact monitoring works within their premistes were not obtained. Impact air quality monitoring was conducted at site boundary of the site office area in Works Area WA2 (AMS3B) respectively. Same baseline and Action Level for air quality, as derived from the baseline monitoring data recorded at Ho Yu College, was adopted for this alternative air quality location.

2.1.3     For impact noise monitoring, monitoring locations NMS2 (Seaview Crescent Tower 1) was set up at the proposed locations in accordance with Contract Specific EM&A Manual. However, for monitoring location NMS3 (Ho Yu College), as proposed in the Contract Specific EM&A Manual, approval for carrying out impact monitoring could not be obtained from the principal of the school. Permission on setting up and carrying out impact monitoring works at nearby sensitive receivers, like Caribbean Coast and Coastal Skyline, was also sought.  However, approvals for carrying out impact monitoring works within their premises were not obtained. Impact noise monitoring was conducted at site boundary of the site office area in Works Area WA2 (NMS3B) respectively. Same baseline noise level, as derived from the baseline monitoring data recorded at Ho Yu College was adopted for this alternative noise monitoring location. Reference is made to ET’s proposal of relocation of air quality monitoring station (AMS7) dated on 2 February 2015, with no further comment received from IEC on 2 February 2015 and no objection received from EPD on 5 February 2015, the impact air quality monitoring station AMS7 (Hong Kong SkyCity Marriott Hotel) has been relocated to AMS7A (Chu Kong Air-Sea Union Transportation Company Limited) on 3 February 2015. Action Level for air quality, as derived from the baseline monitoring data recorded at Hong Kong SkyCity Marriott Hotel, was adopted for this alternative air quality location.

2.1.4     As informed by the premises owner of (AMS7A) - Chu Kong Air-Sea Union Transportation Co. LTD would not grant us the permission to install air quality monitoring equipment (High volume sampler) and conduct 1-hour TSP/24 hour TSP monitoring at the premises of Chu Kong Air-Sea Union Transportation Co. LTD after December 2015. In order to fulfil the EM&A requirement of this Contract, as permission to conduct impact air quality monitoring at the premise of Hong Kong SkyCity Marriott Hotel has been granted in December 2015, ET proposed relocation of air quality monitoring station (AMS7A) on 15 December 2015, with no further comment received from IEC on 15 December 2015 and no particular comment received from EPD on 21 December 2015, the impact air quality monitoring station AMS7A (Chu Kong Air-Sea Union Transportation Company Limited) has been relocated to AMS7 (Hong Kong SkyCity Marriott Hotel) on 30 December 2015. The impact air quality monitoring for December 2015 was conducted before the relocation of AQM Station from AMS7A to AMS7. The impact air quality monitoring has been conducted at AMS7 (Hong Kong SkyCity Marriott Hotel) since 1 January 2016, Action Level for air quality, as derived from the baseline monitoring data recorded at Hong Kong SkyCity Marriott Hotel will be adopted for this air quality monitoring location.

2.1.5     In accordance with the Contract Specific EM&A Manual, twenty-one stations were designated for impact water quality monitoring. The nine Impact Stations (IS) were chosen on the basis of their proximity to the reclamation and thus the greatest potential for water quality impacts, the seven Sensitive Receiver Stations (SR) were chosen as they are close to the key sensitive receives and the five Control/ Far Field Stations (CS) were chosen to facilitate comparison of the water quality of the IS stations with less influence by the Project/ ambient water quality conditions.

2.1.6     Due to safety concern and topographical condition of the original locations of SR4 and SR10B, alternative impact water quality monitoring stations, naming as SR4(N) and SR10B(N), were adopted, which are situated in vicinity of the original impact water quality monitoring stations (SR4 and SR10B) and could be reachable. Same baseline and Action Level for water quality, as derived from the baseline monitoring data recorded, were adopted for these alternative impact water quality monitoring stations.

2.1.7     Due to the commencement of marine work of the Expansion of Hong Kong International Airport into  a  Three-Runway  System  (3RS  Project),  a  large  portion  of  works  site  boundary  will  be established at the northern part of the existing airport Island. The recent arrangement of works boundary of 3RS Project which delineates the boundary of the designated 3RS Project (for the indicative 3RS boundary, please refer to Figure 4a-4d).  The works area of 3RS project will affect several water quality monitoring stations and the dolphin  monitoring  transect  lines  which  are  being  used  for  conducting  monitoring  under Contract No. HY/2010/02.  The EM&A Programme for the HZMB HKBCF Project will therefore be affected. As a result, a proposal was prepared by ET in September 2016 in accordance with condition 5.1 of EP-353/2009/K and condition 4.1 of EP-354/2009/D, to relocate water quality monitoring stations from SR5, IS10, CS(Mf)3  and alternate the transect lines of impact dolphin monitoring 2, 3, 4, 5, 6 and 7.  A revised proposal has been updated and sent to IEC/ENPO for their further review on 24 March 2017 and IEC/ENPO verified the revised proposal on the same date. The revised proposal has been sent to authority by project team for review and approval on 3 April 2017. The authority subsequently approved the proposal on 12 May 2017.

2.1.8     Due to substantial completion of marine works by the end of June 2017, it is anticipated that the remaining construction works under Contract No. HY/2010/02, which include ground investigation (GI) works, construction of temporary timber platform, removal of jetty and reinstatement of seawall at the western section, construction of outfall at the eastern seawall, would cause limited disturbance to water column and not to the seabed. In view of this, a proposal for change of EM&A programme/requirements was prepared by ET in accordance with Condition 5.1 of EP-353/2009/K and Condition 4.1 of EP-354/2009/D, to terminate water quality monitoring works at stations IS5, IS(Mf)6, IS8, SR4(N), SR5(N), SR6, SR10A, SR10B(N), CS4, CSA and CS6, and impact dolphin monitoring (line-transect vessel survey method) covering NEL and NWL when perimeter silt curtain under the Contract is completely removed and vessel traffic numbers average 10 per month for Contract No. HY/2010/02. A revised proposal has been updated and sent to IEC/ENPO for their further review on 15 August 2017 and IEC/ENPO verified the revised proposal on 16 August 2017. The revised proposal has been sent to authority by project team for review and approval on 21 August 2017. The authority subsequently approved the proposal on 7 September 2017.

2.1.9     As informed by IEC/ENPO on 27 December 2017, three water quality monitoring stations of SR3, SR10A and SR10B(N) were relocated due to topographical condition. Alternative water quality monitoring stations SR3(N), SR10A(N) and SR10B(N2) were justified and certified by the ET Leader of Contract No. HY/2013/01 on 8 November 2017, verified by IEC/ENPO on 13 November 2017.  The proposal was submitted to the authority for review and approval on 29 November 2017. The authority subsequently approved the proposal on 22 December 2017. Relocation of water quality monitoring stations from SR3, SR10A and SR10B(N) to SR3(N), SR10A(N) and SR10B(N2) are adopted effective from 22 December 2017.

2.1.10  As informed by IEC/ENPO on 26 February 2018, air quality monitoring station AMS7 was relocated due to permission to carry out AQM at Hong Kong SkyCity Marriott Hotel could not be granted after the end of January 2018. Alternative air quality monitoring station AMS7B was justified and certified by ET Leader of Contract No. HY/2013/01 on 22 January 2018, verified by IEC/ENPO on 24 January 2018. The proposal was submitted to the authority for review and approval on 30 January 2018. Relocation of air quality monitoring stations from AMS7 to AMS7B is adopted effective from 6 February 2018 with the Authority’s consent.

2.1.11  As informed by the Contractor, major construction activities for Contract no. HY/2010/02 has been substantially completed and it is anticipated that potential environmental impact for remaining works which only include ad hoc minor maintenance/touch up works on seawall under the Contract would be insignificant. In view of this, a proposal for Termination of EM&A Programme was prepared and certified by ET in accordance with Condition 5.1 of EP-353/2009/K and Condition 4.1 of EP-354/2009/D to terminate the EM&A Programme for Contract no. HY/2010/02. The proposal has been sent to IEC/ENPO for their further review on 17 April 2018 and IEC/ENPO verified the proposal on 18 April 2018. The proposal has been sent to authority by project team on 19 April 2018. The proposal was subsequently approved by the authority.

2.1.12  The monitoring locations used during the reporting period are depicted in Figures 2, 3 and 4   respectively.

2.1.13  The Contract Specific EM&A Manual also required environmental site inspections for air quality, noise, water quality, chemical, waste management, marine ecology and landscape and visual impact.

2.2             Environmental Quality Performance (Action/Limit Levels)

2.2.1    The environmental quality performance limits (i.e. Action and/or Limit Levels) of air, noise, water quality and Chinese White Dolphin monitoring were derived from the baseline air, baseline noise, baseline water quality monitoring results at the respective monitoring stations and baseline Chinese White Dolphin monitoring respectively, while the environmental quality performance limits of noise monitoring were defined in the EM&A Manual.

2.2.2    The environmental quality performance limits of air quality, noise, water and Chinese White Dolphin monitoring are given in Appendix D.

2.3             Environmental Mitigation Measures

2.3.1        Relevant environmental mitigation measures were stipulated in the Particular Specification and EPs (EP-353/2009/K and EP-354/2009/D) (for TMCLKL Southern Landfall Reclamation only) for the Contractor to adopt. A list of environmental mitigation measures and their implementation statuses are given in Appendix C.

3.                MONITORING Results

3.1             Air Quality Monitoring

3.1.1        Introduction

3.1.1.1.  In accordance with the Contract Specific EM&A Manual, impact 1-hour Total Suspended Particulates (TSP) monitoring was conducted for at least three times every 6 days, while impact 24-hour TSP monitoring was carried out for at least once every 6 days at the 4 monitoring stations (AMS2, AMS3B, AMS6 and AMS7).

3.1.1.2.  The monitoring locations for impact air quality monitoring are depicted in Figure 2a-2e. However, for AMS6 (Dragonair/CNAC (Group) Building), permission on setting up and carrying out impact monitoring works was sought, however, access to the premise has not been granted yet on this report issuing date.

3.1.1.3.  Reference is made to ET’s proposal of relocation of air quality monitoring station (AMS7) dated on 2 February 2015, with no further comment received from IEC on 2 February 2015 and no objection received from EPD on 5 February 2015, the impact air quality monitoring station AMS7 (Hong Kong SkyCity Marriott Hotel) has been relocated to AMS7A (Chu Kong Air-Sea Union Transportation Company Limited) on 3 February 2015 and monitoring work at AMS7A commenced on 5 February 2015. Action Level for air quality, as derived from the baseline monitoring data recorded at Hong Kong SkyCity Marriott Hotel, was adopted for this alternative air quality location.

3.1.1.4.  ET proposed relocation of air quality monitoring station (AMS7A) on 15 December 2015, with no further comment received from IEC on 15 December 2015 and no particular comment received from EPD on 21 December 2015.The impact air quality monitoring were conducted at AMS7 (Hong Kong SkyCity Marriott Hotel), Action Level for air quality, as derived from the baseline monitoring data recorded at Hong Kong SkyCity Marriott Hotel will be adopted for this air quality monitoring location.

3.1.1.5.  As informed by IEC/ENPO on 26 February 2018, air quality monitoring station AMS7 was relocated due to permission to carry out AQM at Hong Kong SkyCity Marriott Hotel could not be granted after the end of January 2018. Alternative air quality monitoring station AMS7B was justified and certified by ET Leader of Contract No. HY/2013/01 on 22 January 2018, verified by IEC/ENPO on 24 January 2018. The proposal was submitted to the authority for review and approval on 30 January 2018. Relocation of air quality monitoring stations from AMS7 to AMS7B is adopted effective from 6 February 2018 with the Authority’s consent.

3.1.1.6.  The weather was mostly sunny and fine, with occasional cloudy and occasional rainy in the reporting period. The major dust source in the reporting period included construction activities from the Contract, as well as nearby traffic emissions.

3.1.1.7.  The number of monitoring events and exceedances recorded in each month of the reporting period are presented in Table 3.1 and Table 3.2 respectively.

3.1.1.8.  The baseline and impact air quality monitoring data are provided in the baseline monitoring report and monthly EM&A reports respectively.  The graphical plots of the impact air quality monitoring results are provided in Appendix E. No specific trend of the monitoring results or existence of persistent pollution source was noted.

Table 3.1          Summary of Number of Monitoring Events for 1-hr & 24-hr TSP Concentration

Monitoring Parameter

Location

No. of monitoring events*

Mar 12 – Apr 18

1-hr TSP

AMS2

1056

AMS3A/3B

1056

AMS7/7A/7B

1056

24-hr TSP

AMS2

352

AMS3A/3B

352

AMS7/7A/7B

352

*No. of monitoring events carried out under this Contract only. The rest of the monitoring events between September 2017 and April 2018 for 1-hour TSP and 24-hour TSP are reported in the EM&A Report prepared for Contract No. HY/2013/01.

Table 3.2          Summary of Number of Exceedances for 1-hr & 24-hr TSP Monitoring

Monitoring Parameter

Location

Level of Exceedance

Number of Exceedance

Mar 12 – Apr 18

1-hr TSP

AMS2

Action

0

Limit

0

AMS3A/3B

Action

0

Limit

0

AMS7/7A/7B

Action

0

Limit

0

Total

0

24-hr TSP

AMS2

Action

2

Limit

1

AMS3A/3B

Action

18

Limit

9

AMS7/7A/7B

Action

5

Limit

0

Total

35

 

3.1.2        Environmental Mitigation Measures

3.1.2.1     Relevant Air mitigation measures, as recommended in the EIA Report were stipulated in the EM&A Manual for the Contractor to adopt. The implementation status of air quality mitigation measures is depicted in Appendix C.

3.1.3        Summary of Actions Taken in the event of Non-Compliance

3.1.3.1   Other than the mitigation measures implemented as mentioned in Appendix C, in the event of non-compliance, actions were taken in accordance with the Event-Action Plan in the EM&A Manual. The Contractor was notified immediately. Investigation was carried out within three working days of identification of non-compliance such as identifying the air pollution sources, checking the implementation status of the mitigation measures, etc., and measurement was repeated to confirm the investigation findings. Further investigation was carried out to identify the source of pollution when deemed necessary. In summary, no direct evidence between the exceedance at AMS2, AMS3B and the Hong Kong Boundary Crossing Facilities - reclamation works could be established for all non-compliances and therefore no action was required to be taken.

3.1.4        Review of Reasons for and the implications of Non-Compliance

3.1.4.1   A total of 25 Action Level exceedances and 10 Limit Level exceedances were recorded during the 24-hr TSP impact monitoring in the reporting period. 4 Action Level exceedances of 24-hr TSP were recorded Contract No. HY/2013/01 and the rest of the exceedances were recorded by this Contract. No action level or limit level exceedance of 1-hour TSP monitoring at all impact air quality monitoring station the reporting period. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports. For level of exceedance, location and when exceedances were recorded, please refer to relevant monthly EM&A report. Investigation results confirm that the exceedances were not related to the activities of this Contract. No other 1-hour and 24-hour action and limit level exceedances was recorded at all monitoring stations in the reporting period.

3.1.5        Environmental Acceptability of the Contract

3.1.5.1   Trend of 1-hour and 24-hour TSP

3.1.5.1.1 The trend of TSP at AMS2, AMS3A/3B and AMS7/7A/7B were comparable to the baseline range and showed no noticeable deterioration of air quality during the impact monitoring period.

3.1.5.2   Correlation between exceedances with possible dust generating activities

3.1.5.2.1  Possible dust generating activities of the Contract did not cause any noticeable deterioration in air quality at Hong Kong Boundary Crossing Facilities – Reclamation Works. With proper implementation of air quality mitigation measures, the monitoring results showed no adverse air quality impact.


3.1.5.3   Comparison of EM&A results with EIA predictions

Table 3.3          Maximum Predicted TSP concentrations under the “Mitigated” scenario

ASR

Location ID in the approved EIA report

Predicted Daily Concentrations*

Average Impact 1-hour TSP Levels#, mg/m3

 

Average Impact 24-hour TSP Levels#, mg/m3

 

1-hour

24-hour

AMS7/AMS7A/ AMS7B

Hong Kong SkyCity Marriott Hotel

344

92

77

66

              *Extracted from Table 5-8 of the EIA report

# Both average Impact 1-hour TSP Levels and average Impact 24-hour TSP Levels were calculated using monitoring data obtained by this Contract between March 2012 to August 2017. Monitoring works and monitoring data between September 2017 and April 2018 for the Contract are covered by Contract No. HY/2013/01 Hong Kong-Zhuhai Macao Bridge HKBCF –Passenger Clearance Building.

 

3.1.5.3.1  At 1-hour and 24-hour TSP monitoring station at AMS7/AMS7A/AMS7B, the average 24-hour TSP levels recorded in the EM&A programme were in similar magnitude as the Daily dust level predicted in the EIA.

3.1.6    Practicality and Effectiveness of the EIA process and the EM&A programme

3.1.6.1     Monitoring and auditing of air quality was recommended for the construction phase of the Project in the EIA to ensure no exceedance of the TSP standard at the sensitive receiver.

3.1.6.2     The air quality monitoring methodology was effective in monitoring the air quality impacts of the Contract. Baseline monitoring of 1-hour and 24-hour TSP helped to determine the ambient TSP levels at the sensitive receiver prior to commencement of construction works. During periods when there were possible dust generating construction activities, impact monitoring of 24-hour TSP helped to determine whether the Contract caused unacceptable air quality impacts on the sensitive receiver. As the scope of the Contract mainly includes reclamation works during the reporting period and dust generation from the construction activities such as wind erosion and sand filling is the key concern during the construction phase. The monitoring of TSP was therefore considered to be cost effective for the Contract.

3.1.6.3     All recommended mitigation measures were applicable to the Contract. As discussed above, the Contract did not cause unacceptable air quality impacts. However, as the nature of the Contract is reclamation works of approximately 130 hectares of land in size, some mitigation measures in practice were generally focused on dust generating activities only. Nevertheless, the mitigation measures implemented were effective and efficient in controlling air quality impacts.

3.1.6.4     Monitoring and audit of 24-hour TSP levels had ensured that any deterioration in air quality was readily detected and timely actions taken to rectify any non-compliance. Assessment and analysis of 24-hour TSP results collected throughout the baseline and impact monitoring periods also demonstrated the environmental acceptability of the Contract. Weekly site inspections had ensured that the EIA recommended air quality mitigation measures were effectively implemented. The EM&A program is considered to be cost effective.

3.1.7    Conclusion

3.1.7.1 Air quality monitoring for the Contract was conducted during the baseline and impact monitoring periods. Key construction activities including reclamation works, seawall construction, maintenance of silt curtain, outfall installation, additional GI installation, reinstatement of seawall, surcharge removal & laying, construction of permanent seawall, maintenance works of site office, works of public works regional laboratory at works area and maintenance of temporary marine access. The trend of 1-Hour TSP and 24-hour TSP was comparable to the baseline range and showed no noticeable deterioration of air quality during the monitoring period. Although exceedances were recorded, they were isolated and short-term events. There is no evidence of long-term deteriorating trend.

3.1.7.2 The average 24-hour TSP levels recorded at AMS7/7A/7B in EM&A programme were in similar magnitude with the Daily dust level predicted in the EIA. No TSP level was predicted by the Project EIA at AMS2 and AMS3A/3B and therefore, no comparison of EM&A data with EIA predictions could be made. Air quality mitigation measures implemented were effective in controlling air quality impacts.


3.2             Noise Monitoring

3.2.1        Introduction

3.2.1.1   Impact noise monitoring was conducted at the 2 monitoring stations (NMS2 and NMS3A/3B) for at least once per week during 07:00 – 19:00 in the reporting period.

3.2.1.2   The monitoring locations used during the reporting period are depicted in Figure 2a-2e.

3.2.1.3   Major noise sources during the noise monitoring included construction activities of the Contract and nearby traffic noise.

3.2.1.4   The number of impact noise monitoring events and exceedances are summarized in Table 3.4 and Table 3.5 respectively.

Table 3.4            Summary of Number of Monitoring Events for Impact Noise

Monitoring Parameter

Location

No. of monitoring events

Mar 12- April 18

Noise

NMS2

283

NMS3A/NMS3B

283

*Only no. of monitoring events carried out under this Contract is reported. The rest of the monitoring events between September 2017 and April 2018 for construction noise monitoring are reported in the EM&A Report prepared for Contract No. HY/2013/01.

Table 3.5            Summary of Number of Monitoring Exceedances for Impact Noise

Monitoring Parameter

Location

Level of Exceedance

No. of Exceedance(s)

Noise

NMS2

Action

1

Limit

0

NMS3A/NMS3B

Action

0

Limit

1

Total

2

 

3.2.1.5   The graphical plots of the trends of the monitoring results are provided in Appendix F. No specific trend of the monitoring results or existence of persistent pollution source was noted.

3.2.2        Environmental Mitigation Measures

3.2.2.1. Relevant noise mitigation measures, as recommended in the EIA Report were stipulated in the EM&A Manual for the Contractor to adopt. The implementation status of noise mitigation measures is depicted in Appendix C. Construction Noise Permits were applied and complied with when construction works were carried out during restricted hours.

3.2.3        Non-compliance (exceedances) of the Environmental Quality Performance Limits (Action and Limit Levels)

3.2.3.1   Summary of Non-compliance (Exceedances)

3.2.3.1.1  Table 3.5 summarised the number exceedance recorded at each monitoring station throughout the impact monitoring period. 1 Limit Level exceedance of impact noise monitoring was recorded in June 2012. No exceedance of impact noise monitoring was recorded by Contract No. HY/2013/01 and all exceedances were recorded by this Contract. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports. Investigation results show that the exceedance was not due to the Project works. The Contractor was recommended to continue implementing existing noise mitigation measures. 1 noise complaint was received in October 2012 and therefore 1 Action Level Exceedance of construction noise was recorded in October 2012. Investigation into the possible causes of such exceedance was undertaken and reported in the respective monthly EM&A reports, the investigations results confirmed that the action and limit level exceedance were not related to Contract.

3.2.3.2   Summary of Actions Taken in the event of Non-Compliance

3.2.3.2.1  Investigation was carried out within three working days of identification of non-compliance. Assessments showed that all exceedances were not due to the works and therefore no action was required to be taken and these were verified by the IEC.

3.2.3.3   Review of Reasons for and the implications of Non-Compliance

3.2.3.3.1  There was 1 limit level exceedance recorded at NMS3A. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports. The investigations results confirmed that the limit level exceedance was not related to Contract.

3.2.3.3.2  1 noise complaint was received in October 2012 and therefore 1 Action Level Exceedance of construction noise was recorded in October 2012. Investigation into the possible causes of such exceedance was undertaken and reported in the respective monthly EM&A reports, the investigations results confirmed that the action level exceedance was not related to Contract.

3.2.3.3.3  In summary, the average impact noise levels recorded in the reporting period were generally within the range of the predicted construction noise levels in the Project EIA.

3.2.4        Environmental Acceptability of the Contract

3.2.4.1 Trend of Measured Noise Level (Leq)

3.2.4.1.1  Other than an isolated event, the noise monitoring results for all monitoring stations were below the Limit levels. The trend showed no noticeable noise impact from the Project during the impact monitoring period.

3.2.4.2 Correlation between exceedances with possible noise generating activities

3.2.4.2.1  Exceedances were rarely recorded for all monitoring stations. However, exceedance was recorded at monitoring station NMS3A/3B.

3.2.4.2.2  For exceedance recorded at NMS3A, it exceeded the limit level, trench excavation (near access road) and general site clearance were the major land-based construction activity being undertaken at Works Area WA2 during the monitoring period. Stone blanket laying at Portion B and Portion E1 was the major marine-based construction activities being undertaken during the monitoring period. Field observations indicated that construction activities, like sheet piling, percussive piling and excavation, were carrying out in other private developments (which are located at eastern and southern side of the Works Area WA2) during the course of monitoring, which are close to the monitoring station NMS3A and contribute to the measured noise level. Therefore, noise generating activities of the Project did not cause any noticeable noise impact at the sensitive receivers. The impact noise levels recorded were generally similar to the predicted construction noise levels in the Project EIA.

3.2.5        Comparison of EM&A results with EIA predictions

3.2.5.1     The EIA predicted that noise emitted by the use of Powered Mechanical Equipment (PME) on site would be the major source of noise impact during construction. The Construction Noise Impact at Noise Sensitive Receivers are summarised in Table 3.6 (extracted from Table 6-9 of the EIA Report).

Table 3.6          Construction Noise Impact at Noise Sensitive Receivers

NSR

Location

Predicted Noise Levels, dB(A)

Total Noise Impacts, dB(A)

Criterion, dB(A)

NMS2

Seaview Crescent Tower 1

74

75

 

3.2.5.2     During the construction period of the Contract, 1 limit level and 1 action level exceedances were recorded in the impact monitoring period.  The measured impact noise levels of the Contract for each monitoring station are summarised in Table 3.7 for comparison with EIA.

  Table 3.7          Summary of Construction Noise Monitoring Results in the Reporting Period

NSR

Location

Average#, dB(A), Leq,30 mins

Range#, dB(A), Leq,30 mins

Limit Level, dB(A), Leq,30 mins

NMS2

Seaview Crescent Tower 1

67

61 - 74^

75

NMS3A/NMS3B

Site Boundary of Site Office Area at Works Area WA2

66

53 - 75*

70

* Façade measurements were made at NMS3A on or before 5 September 2012. Free field measurements were made on all monitoring after 5 September 2012 due to removal of site office located at NMS3A. A correction of +3 dB(A) was be made to all free field measurements.

# Both average and range of construction noise were calculated using monitoring data obtained by this Contract between March 2012 to August 2017. Monitoring works and monitoring data between September 2017 and April 2018 for the Contract are covered by Contract No. HY/2013/01 Hong Kong-Zhuhai Macao Bridge HKBCF –Passenger Clearance Building.

 

3.2.5.3     The average impact noise levels recorded in EM&A during impact monitoring were all within the range of the predicted construction noise levels in the EIA Report. Investigation into the possible causes of each exceedance was undertaken and reported in the respective monthly EM&A reports.

3.2.6        Practicality and Effectiveness of the EIA process and the EM&A programme

3.2.6.1     Monitoring and auditing of noise was recommended for the construction phase of the Project in the EIA process to ensure compliance with the appropriate criterion at the receivers.

3.2.6.2     The noise monitoring methodology was effective in monitoring the noise impacts of the Contract. Baseline noise monitoring determined the ambient noise levels at the sensitive receivers prior to commencement of construction works. During periods when possible noise generating construction activities were on-going, impact noise monitoring would determine whether the Contract caused adverse noise impacts on the sensitive receivers. The monitoring methodology which focus on Leq30 minute therefore considered to be cost effective for the Contract.

3.2.6.3     Noise mitigation measures recommended in the EIA Report were stipulated in the EM&A Manual for the Contractor to implement during the construction phase of the Project. The list of noise mitigation measures is depicted in Appendix C. All recommended mitigation measures were applicable to the Contract. As discussed above, the Contract did not cause adverse noise impacts to the receivers. Therefore, the mitigation measures implemented were effective and efficient in controlling noise impacts.

3.2.6.4     Monitoring and audit of noise levels ensured that any noise impact to the receivers would readily be detected and timely actions could be taken to rectify any non-compliance. Assessment and analysis of noise results collected throughout the baseline and impact monitoring periods also demonstrated the environmental acceptability of the Contract. Weekly site inspections ensured that the EIA recommended noise mitigation measures were effectively implemented. The EM&A program is considered to be cost effective.

3.2.7        Conclusion

3.2.7.1   The trend of Leq was comparable to the baseline range and showed no noticeable noise impact during the impact monitoring period. Although exceedance was recorded, there was no evidence of long-term increasing trend. The average impact noise levels recorded in EM&A programme were all lower than the construction noise levels predicted in the EIA.


3.3             Water Quality Monitoring

3.3.1        Introduction

3.3.1.1   Impact water quality monitoring was conducted 3 times per week during mid-ebb and mid-flood tides at 21 water monitoring stations (9 Impact Stations, 7 Sensitive Receiver Stations and 5 Control/Far Field Stations).

3.3.1.2     The monitoring locations used during the reporting period are depicted in Figure 3a-3f.

3.3.1.3     Number of impact water quality monitoring events and exceedances recorded in the reporting period at each impact station are summarized in Table 3.8 and Table 3.9 respectively.

Table 3.8            Summary of Number of Monitoring Events for Impact Water Quality

Monitoring Parameter

Tide

No. of monitoring events#

Mar 17 – Apr 18

Water Quality

Mid-Ebb

844*

Mid-Flood

845*

#monitoring works between September 2017 and April 2018 for the Contract are covered by Contract No. HY/2013/01 Hong Kong-Zhuhai Macao Bridge HKBCF –Passenger Clearance Building.

 

Table 3.9          Summary of Water Quality Exceedances in Mar 12 – Apr 18

Station

Exceedance Level

DO (S&M)

DO (Bottom)

Turbidity

SS

Total

Ebb

Flood

Ebb

Flood

Ebb

Flood

Ebb

Flood

Ebb

Flood

IS5

Action

0

0

1

2

0

0

3

4

4

6

Limit

0

0

0

0

0

0

0

0

0

0

IS(Mf)6

Action

0

0

0

0

0

1

5

9

5

10

Limit

0

0

0

0

0

0

0

0

0

0

IS7

Action

1

0

1

0

0

1

3

10

5

11

Limit

0

0