Expansion of Hong Kong
International Airport into a Three-Runway System

Construction Phase Quarterly EM&A Report No.5 (1 January to 31 March 2017)

June 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                                                                                              

                                                                                                                              

 

 

 

 

 

 

Contents

Executive Summary                                                                                                       

1       Introduction                                                                                                            

1.1     Background                                                                                                      

1.2     Scope of this Report                                                                                          

1.3     Project Organisation                                                                                          

1.4     Contact information for the Project                                                                     

1.5     Summary of Construction Works                                                                        

1.6     Summary of EM&A Programme Requirements                                                    

2       Environmental Monitoring and Auditing                                                          

2.1     Air Quality Monitoring                                                                                      

2.2     Noise Monitoring                                                                                             

2.3     Water Quality Monitoring                                                                                 

2.3.1       Monitoring Schedule                                                                          

2.3.2       Action and Limit Levels for Water Quality Monitoring                           

2.3.3       Summary of Monitoring Results                                                         

2.4     Waste Monitoring                                                                                            

2.5     CWD Monitoring                                                                                              

2.5.1       Summary of Monitoring Requirements                                                

2.5.2       Summary of Monitoring Results                                                         

2.6     Weekly Environmental Site Inspection                                                              

2.7     Ecological Monitoring                                                                                      

2.8     Audit of the SkyPier Plan                                                                                 

2.9     Audit of Construction and Associated Vessels                                                   

2.10    Coral Post-Translocation Monitoring                                                                 

2.11    Review of the Key Assumptions Adopted in the EIA Report                                

3       Report on Non-compliance, Complaints, Notifications of Summons and Prosecutions       

3.1     Compliance with Other Statutory Environmental Requirements                          

3.2     Analysis and Interpretation of Complaints, Notification of Summons and Status of Prosecutions        

3.2.1       Complaints                                                                                       

3.2.2       Notifications of Summons or Status of Prosecution                              

3.3     Cumulative Statistics                                                                                       

4       Conclusion and Recommendation                                                                   

 

Tables

Table 1.1: Contact Information of Key Personnel 5

Table 1.2: Contact Information of the Project 7

Table 1.3: Summary of Status for All Environmental Aspects under the Updated EM&A Manual 8

Table 2.1: Impact Air Quality Monitoring Stations  11

Table 2.2: Impact Noise Quality Monitoring Stations  12

Table 2.3:     Monitoring Locations and Parameters for Impact Water Quality Monitoring  13

Table 2.4:     Action and Limit Levels for General Water Quality Monitoring and Regular DCM Monitoring  15

Table 2.5:     The Control and Impact Stations during Flood Tide and Ebb Tide for General Water Quality Monitoring and Regular DCM Monitoring  15

Table 2.6: Summary of Turbidity Compliance Status at IM and SR Stations (Mid-Ebb Tide) 16

Table 2.7: Summary of Turbidity Compliance Status at IM and SR Stations (Mid-Flood Tide) 16

Table 2.8: Summary of SS Compliance Status at IM and SR Stations (Mid-Ebb Tide) 17

Table 2.9: Summary of SS Compliance Status at IM and SR Stations (Mid-Flood Tide) 17

Table 2.10: Summary of Nickel Compliance Status at IM Stations (Mid-Ebb Tide) 19

Table 2.11: Summary of Nickel Compliance Status at IM Stations (Mid-Flood Tide) 19

Table 2.12:   Action and Limit Levels for Construction Waste  20

Table 2.13:   Land-based Survey Station Details  21

Table 2.14:   Derived Values of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring  21

Table 2.15:   Summary of Number of CWD Sightings and Number of CWD Individuals for Previous Quarters and Current Reporting Quarter. 22

Table 2.16: Summary of Monthly and Running Quarterly STG and ANI of Chinese White Dolphin for Previous and Current Reporting Quarters  24

Table 2.17:   Summary of Photo Identification  28

Table 2.18:   Summary of Survey Effort and CWD Group of Land-based Theodolite Tracking  29

Table 2.19:   Summary of the Post-Translocation Monitoring Surveys Completed in this Reporting Quarter 35

Table 3.1:  Statistics for Valid Exceedances for the Environmental Monitoring  37

Table 3.2:  Statistics for Non-compliance, Complaints, Notifications of Summons and Prosecution  37

 

 

 

 

 

 

 

 

 

Figures

Figure 1.1- 1.2    Locations of Key Construction Activities in this reporting period

Figure 2.1           Locations of Air and Noise Monitoring Stations and Chek Lap Kok Wind Station

Figure 2.2           Locations of Water Quality Monitoring Stations  

Figure 2.3a         Vessel based Dolphin Monitoring Transects in Baseline Monitoring

Figure 2.3b         Vessel based Dolphin Monitoring Transects in Construction, Post-construction and Operation Phases

Figure 2.4           Land based Dolphin Monitoring Locations

Figure 2.5           Sightings Distribution of Chinese White Dolphins

Figure 2.6           Sighting Locations of Chinese White Dolphins with Different Group Sizes

Figure 2.7           Sighting Locations of Chinese White Dolphins Engaged in Different Behaviours

Figure 2.8           Sighting Locations of Mother-calf Pairs

Figure 2.9           Plots of First Sightings of All CWD Groups from Land-based Stations

Figure 2.10         Location for Passive Acoustic Monitoring

 

Appendices

Appendix A        Contract Description

Appendix B        Project Organization Chart

Appendix C        Environmental Mitigation Implementation Schedule (EMIS) for Construction Phase

Appendix D        Graphical Plots of Water Quality Monitoring Results

Appendix E        Summary of Chinese White Dolphin Monitoring Results

Appendix F        Location Plans of Coral Translocation

Appendix G       Summary of Ecological Monitoring Results

 

 

 

 

 

 

 

 

 

 

 

 


 

Executive Summary

The “Expansion of Hong Kong International Airport into a Three-Runway System” (the Project) serves to meet the future air traffic demands at Hong Kong International Airport (HKIA).  On 7 November 2014, the Environmental Impact Assessment (EIA) Report (Register No.: AEIAR-185/2014) for the Project was approved and an Environmental Permit (EP) (Permit No.: EP-489/2014) was issued for the construction and operation of the Project.

Airport Authority Hong Kong (AAHK) commissioned Mott MacDonald Hong Kong Limited (MMHK) to undertake the role of Environmental Team (ET) for carrying out the Environmental Monitoring & Audit (EM&A) works during the construction phase of the Project in accordance with the Updated EM&A Manual.  

This is the 5th Construction Phase Quarterly EM&A Report for the Project which summarizes the monitoring results and audit findings of the EM&A programme during the reporting period from 1 January 2017 to 31 March 2017.  

Key Activities in the Reporting Period

Key activities of the Project carried out in the reporting period were related to the following contracts:

Advanced Works:

Contract P560 (R) Aviation Fuel Pipeline Diversion Works

·         Horizontal Directional Drilling (HDD) works;

·         Pipeline supporting works; and

·         Stockpiling of excavated materials from HDD operation.

DCM Works:

Contracts 3201 to 3205 Deep Cement Mixing (DCM) Works

·         Coring works;

·         Site office establishment;

·         Laying of geotextile and sand blanket; and

·         DCM trials and works.

Reclamation Works:

Contract 3206 Main Reclamation Works

·         Site office establishment; and

·         Laying of geotextile and sand blanket.

 

EM&A Activities Conducted in the Reporting Period

The EM&A programme was undertaken in accordance with the Updated EM&A Manual of the Project. A summary of the monitoring and audit activities during this reporting period is presented as below:

Monitoring/ Audit Activities

Number of Sessions

1-hour Total Suspended Particulates (TSP) Air Quality Monitoring

99

Noise Monitoring

65

Water Monitoring

38

Ecological Monitoring

3

Vessel line-transect surveys for Chinese White Dolphin (CWD) monitoring

6

Land-based theodolite tracking survey effort for CWD monitoring

15

Coral Post-translocation Monitoring

3

 

Ecological Monitoring

Toolbox Talk Training to Site Staff by Contractor

Meeting with SkyPier Ferry Operator Representatives

In total, 2,511 ferry movements between HKIA SkyPier and Zhuhai / Macau were audited in the reporting period. All High Speed Ferries (HSFs) travelled through the Speed Control Zone (SCZ) with average speeds within 15 knots, which complied with the Marine Travel Routes and Management Plan for High Speed Ferries of SkyPier (the SkyPier Plan). Four ferry movements had minor deviations from the diverted route during the reporting period and all of them were related to public safety / emergency situations.

During the reporting period, ET conducted weekly audit of relevant information to ensure the contractors complied with the requirements of the Marine Travel Routes and Management Plan for Construction and Associated Vessel (MTRMP-CAV). A total of 13 skipper training workshops were held by ET during the reporting period with concerned captains of construction vessels associated with 3RS contracts. Another 8 skipper training workshops were held by contractors’ Environmental Officers (EO) and competency tests were conducted subsequently with the trained captains by ET. The upgraded Maritime Surveillance System (MSS) was launched in March 2017. The MSS automatically recorded deviation cases such as speeding, entering no entry zone, and not traveling through the designated gates. These recorded cases were cross checked with construction and associated vessel records provided by the contractors to ensure the MSS recorded all deviation cases accurately.

On the implementation of Marine Mammal Watching Plan (MMWP), silt curtains were in place by the contractors for sand blanket laying works and dolphin observers were deployed in accordance with the plan. On the implementation of Dolphin Exclusion Zone (DEZ) Plan, dolphin observers were deployed by the contractors for continuous monitoring of the DEZ for DCM works in accordance with the DEZ Plan. Trainings for the proposed dolphin observers were provided by the ET prior to the aforementioned works, with the training records kept by the ET.  From the contractors’ MMWP observation records and DEZ monitoring records, no dolphin or other marine mammals were observed within or around the silt curtains, whilst there was one record of dolphin sighting within the DEZ of DCM works in this reporting quarter. Audits of acoustic decoupling for construction vessels were also carried out by the ET.

In accordance with the Coral Translocation Plan, translocation of 384 gorgonian coral colonies from the donor site along the existing northern seawall of the airport island to the recipient site at Yam Tsai Wan was completed in January 2017. A total of 85 translocated coral colonies and 20 indigenous colonies as control corals were selected and tagged for post-translocation monitoring. The monitoring was conducted as per an enhanced monitoring programme based on the Coral Translocation Plan. Three rounds of monitoring were conducted and completed in January, February and March 2017 respectively. No exceedances of the Action or Limit levels in percentage of partial mortality of the translocated coral colonies were recorded during the reporting period.

Review of Environmental Quality Performance Limits (Action and Limit levels)

For water quality, the monitoring results for dissolved oxygen (DO), total alkalinity, and chromium obtained during the reporting period complied with their corresponding Action and Limit Levels stipulated in the EM&A programme for triggering the relevant investigation and follow-up procedures under the programme if being exceeded. For turbidity, suspended solids (SS) and nickel, some of the testing results exceeded the relevant Action or Limit Levels during the reporting period, and the corresponding investigations were conducted accordingly. The investigation findings concluded that the exceedances were not due to the Project.

No breach of Action or Limit Levels in relation to construction dust, noise, waste and CWD monitoring was recorded during the reporting period. 

Implementation Status and Review of Environmental Mitigation Measures

Weekly site audits were carried out during the reporting period to confirm the implementation measures undertaken by the contractors. Environmental issues related to construction activities, including construction dust, construction noise, construction waste, terrestrial ecology and CWD were monitored and/or reviewed.  

Recommended environmental mitigation measures, as included in the EM&A programme, were implemented properly during the reporting period. The EM&A programme effectively monitored the construction activities and ensured proper implementation of the mitigation measures.

Summary Findings of the EM&A Programme

 

The following table summarizes the key findings of the EM&A programme during the reporting period:

 

 

Yes

No

Details

Analysis / Recommendation / Remedial Actions

Breaches of Limit Level^

 

ü

No project-related limit level exceedance was recorded.

Nil

Breaches of Action Level^

 

 

 

ü

No project-related action level exceedance was recorded.

Nil

Complaints Received

ü

 

A complaint of night time work and construction wastewater at Sheung Sha Chau was received on 19 Jan 2017.

Complaint investigation was carried out in accordance with the Complaint Management Plan. The investigation details are presented in S3.2.1.

Notification of any summons and status of prosecutions

 

ü

Neither notifications of summons nor prosecution were received.

Nil

Changes that affect the EM&A

 

ü

There was no change to the construction works that may affect the EM&A

Nil

Remarks: ^ Only exceedance of Action or Limit Level related to the Project will be highlighted. 

1        Introduction

1.1      Background

On 7 November 2014, the Environmental Impact Assessment (EIA) Report (Register No.: AEIAR-185/2014) for the “Expansion of Hong Kong International Airport into a Three-Runway System” (the Project) was approved and an Environmental Permit (EP) (Permit No.: EP-489/2014) was issued for the construction and operation of the Project.

Airport Authority Hong Kong (AAHK) commissioned Mott MacDonald Hong Kong Limited (MMHK) to undertake the role of Environmental Team (ET) for carrying out the Environmental Monitoring & Audit (EM&A) works during the construction phase of the Project in accordance with the Updated EM&A Manual (the Manual) submitted under EP Condition 3.1. The Manual is available on the Project’s dedicated website (accessible at: http://env.threerunwaysystem.com/en/index.html). AECOM Asia Company Limited (AECOM) was employed by AAHK as the Independent Environmental Checker (IEC) for the Project.

The Project covers the expansion of the existing airport into a three-runway system (3RS) with key project components comprising land formation of about 650 ha and all associated facilities and infrastructure including taxiways, aprons, aircraft stands, a passenger concourse, an expanded Terminal 2, all related airside and landside works and associated ancillary and supporting facilities. The existing submarine aviation fuel pipelines and submarine power cables also require diversion as part of the works.

Construction of the Project is to proceed in the general order of diversion of the submarine aviation fuel pipelines, diversion of the submarine power cables, land formation, and construction of infrastructure, followed by construction of superstructures.

The updated overall phasing programme of all construction works was presented in Appendix A of the Construction Phase Monthly EM&A Report No. 7. Contract information is presented in Appendix A.

1.2      Scope of this Report

This is the 5th Construction Phase Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 January 2017 to 31 March 2017.

1.3      Project Organisation

The Project’s organisation structure and the contact details of the key personnel are provided in Appendix B and Table 1.1 respectively.

Table 1.1: Contact Information of Key Personnel

Party

Position

Name

Telephone

Project Manager’s Representative

(Airport Authority Hong Kong)

Principal Manager, Environment

Lawrence Tsui

2183 2734

Environmental Team (ET)

(Mott MacDonald Hong Kong Limited)

Environmental Team Leader

Terence Kong

2828 5919

 

Deputy Environmental Team Leader

Heidi Yu

2828 5704

 

Deputy Environmental Team Leader

Keith Chau

2972 1721

Independent Environmental Checker (IEC)

(AECOM Asia Company Limited)

Independent Environmental Checker

Jackel Law

3922 9376

 

 

Deputy Independent Environmental Checker

Joanne Tsoi

3922 9423

Advanced Works:

 

 

 

Contract P560(R) Aviation Fuel Pipeline Diversion Works

(Langfang Huayuan Mechanical and Electrical Engineering Co., Ltd.)

Project Manager

 

Wei Shih

 

2117 0566

 

 

Environmental Officer

Lyn Lau

 

5172 6543

 

DCM Works:

 

 

 

Contract 3201 DCM (Package 1)

(Penta-Ocean-China State-Dong-Ah Joint Venture)

Project Director

 

Tsugunari Suzuki

 

9178 9689

 

Environmental Officer

 

Sze Ming Chan

 

9384 5494

Contract 3202 DCM (Package 2)

(Samsung-BuildKing Joint Venture)

Project Manager

 

Ilkwon Nam

 

9643 3117

 

Environmental Officer

 

Dickson Mak

 

9525 8408

Contract 3203 DCM  (Package 3)

(Sambo E&C Co., Ltd.)

Project Manager

 

Seong Jae Park

 

9683 8693

 

Environmental Officer

 

Calvin Leung

 

9203 5820

Contract 3204 DCM  (Package 4)

(CRBC-SAMBO Joint Venture)

Project Manager

 

Kyung-Sik Yoo

 

9683 8697

 

 

Environmental Officer

 

Kanny Cho

 

9019 1962

Contract 3205 DCM (Package 5)

(Bachy Soletanche - Sambo Joint Venture)

Deputy Project Director

Min Park

9683 0765

 

Environmental Officer

 

Margaret Chung

9130 3696

Reclamation Works:

 

 

 

Contract 3206

(ZHEC-CCCC-CDC Joint Venture)

Project Manager

Kim Chuan Lim

3693 2288

 

Environmental Officer

 

Kwai Fung Wong

 

3693 2252

Other Works:

 

 

 

Contract 3213 CLP Cable Diversion Enabling Works (Wing Hing Construction Company)

 

Project Manager

 

Michael Kan

9206 0550

 

Environmental Officer

 

Ivy Tam

2151 2090

1.4      Contact information for the Project

The contact information for the Project is provided in Table 1.2. The public can contact us through the following channels if they have any queries and comments on the environmental monitoring data and project related information.

Table 1.2: Contact Information of the Project

Channels

Contact Information

Hotline

3908 0354

Email

env@3rsproject.com

Fax

3747 6050

Postal Address

Airport Authority Hong Kong

HKIA Tower

1 Sky Plaza Road

Hong Kong International Airport

Lantau

Hong Kong

Attn: Environmental Team Leader Mr Terence Kong

c/o Mr Lawrence Tsui (TRD)

1.5      Summary of Construction Works

The key activities of the Project carried out during the reporting period included five DCM contracts, an advanced works contract, and a reclamation contract. The DCM contracts involved coring works, site office establishment, laying of geotextile and sand blanket, and DCM trials and works; the advanced works contract involved HDD works, pipeline supporting works, and stockpiling of excavated materials from HDD operation; and the reclamation contract involved site office establishment, and laying of geotextile and sand blanket.

The locations of the works areas are presented in Figure 1.1 to Figure 1.2. Some site investigation works were carried out during the reporting period.

1.6      Summary of EM&A Programme Requirements

The status for all environmental aspects is presented in Appendix A. The EM&A requirements remained unchanged during the reporting period.

Table 1.3: Summary of Status for All Environmental Aspects under the Updated EM&A Manual

Parameters

EM&A Requirements

Status

Air Quality

 

 

Baseline Monitoring

At least 14 consecutive days before commencement of construction work

The baseline air quality monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4.

Impact Monitoring

At least 3 times every 6 days

On-going

Noise

 

 

Baseline Monitoring

Daily for a period of at least two weeks prior to the commencement of construction works

The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4.

Impact Monitoring

Weekly

On-going

Water Quality

 

 

General Baseline Water Quality Monitoring for reclamation, water jetting and field joint works

Three days per week, at mid-flood and mid-ebb tides, for at least four weeks prior to the commencement of marine works.

The baseline water quality monitoring result has been reported in Baseline Water Quality Monitoring Report and submitted to EPD under EP Condition 3.4.

General Impact Water Quality Monitoring for reclamation, water jetting and field joint works

Three days per week, at mid-flood and mid-ebb tides.

On-going

Initial Intensive Deep Cement Mixing (DCM) Water Quality Monitoring

At least four weeks

Initially started in late March 2017. Due to the changes in DCM works areas, the monitoring programme is subject to review.

Regular DCM Water Quality Monitoring

Three times per week until completion of DCM works.

On-going

Waste Management

 

 

Waste Monitoring

At least weekly

On-going

Land Contamination

 

 

Supplementary Contamination Assessment Plan (CAP)

At least 3 months before commencement of any soil remediation works.

To be submitted with the relevant construction works.

Contamination Assessment Report (CAR) for Golf Course

CAR to be submitted for golf course first; programme for submission of supplementary CAR at the other areas to be agreed.

The CAR for Golf Course was submitted to EPD.

Terrestrial Ecology

 

 

Pre-construction Egretry Survey Plan

Once per month in the breeding season between April and July, prior to the commencement of HDD drilling works.

The revised Egretry Survey Plan was submitted and approved by EPD under EP Condition 2.14.

Ecological Monitoring

Monthly monitoring during the HDD construction works period from August to March.

On-going

Marine Ecology

 

 

Pre-Construction Phase Coral Dive Survey

Prior to marine construction works

The Coral Translocation Plan was submitted and approved by EPD under EP Condition 2.12.

Coral Translocation

-

The coral translocation was completed on 5 January 2017.

Post-translocation Monitoring

As per an enhanced monitoring programme based on the Coral Translocation Plan

On-going

Chinese White Dolphins (CWD)

 

Baseline Monitoring

6 months of baseline surveys before the commencement of land formation related construction works.

Vessel surveys: Two full surveys per month;

Land-based theodolite tracking: Two days per month at the Sha Chau station and two days per month at the Lung Kwu Chau Station; and

PAM: For the whole duration of baseline period.

Baseline CWD results were reported in the CWD Baseline Monitoring Report and submitted to EPD in accordance with EP Condition 3.4.

Impact Monitoring

Vessel surveys: Two full surveys per month;

Land-based theodolite tracking: One day per month at the Sha Chau station and one day per month at the Lung Kwu Chau Station; and

PAM: For the whole duration for land formation related construction works.

On-going

Landscape and Visual

 

 

Baseline Monitoring

One-off survey within the Project site boundary prior to commencement of any construction works

The baseline landscape & visual monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4.

Impact Monitoring

Weekly

On-going

Environmental Auditing

 

Regular site inspection

Weekly

On-going

Marine Mammal Watching Plan (MMWP) implementation measures

Monitor and check

On-going

Dolphin Exclusion Zone Plan (DEZP) implementation measures

Monitor and check

On-going

SkyPier High Speed Ferries (HSF) implementation measures

Monitor and check

On-going

Construction and Associated Vessels Implementation measures

Monitor and check

On-going

Complaint Hotline and Email channel

Construction phase

On-going

Environmental Log Book

Construction phase

On-going

Taking into account the construction works during the reporting period, impact monitoring of air quality, noise, water quality, waste management, ecology, and CWD were carried out in the reporting period. Upon completion of coral translocation in January 2017, a summary of the ensuing post-translocation monitoring is reported quarterly.

The EM&A programme also involved weekly site inspections and related auditing conducted by ET for the checking of implementation of required environmental mitigation measures recommended in the approved EIA Report. In order to enhance environmental awareness and closely monitor the environmental performance of the contractors, environmental briefings and regular environmental management meetings were conducted.

The EM&A programme has been following the recommendations presented in the approved EIA Report and the Manual. A summary of implementation status of the environmental mitigation measures for the construction phase of the Project during the reporting period is provided in Appendix C.


 

2              Environmental Monitoring and Auditing

2.1      Air Quality Monitoring

Impact 1-hour Total Suspended Particulates (TSP) monitoring was conducted three times every six days at two representative monitoring stations during the reporting period. The locations of monitoring stations are described in Table 2.1 and presented in Figure 2.1. The Action and Limit Levels of the air quality monitoring stipulated in the EM&A programme for triggering the relevant investigation and follow-up procedures under the programme are also provided in Table 2.1 for reference.

Table 2.1: Impact Air Quality Monitoring Stations

Monitoring Station

Location

Action Level (mg/m3)

Limit Level (mg/m3)

AR1A

Man Tung Road Park

306

500

AR2

Village House at Tin Sum

298

 

The graphical plot of impact air quality monitoring results during the reporting period is presented in Graph 1.

Graph 1: Graphical Plot of 1-hour TSP concentration at AR1A and AR2 during the Reporting Period  

No exceedance of the Action and Limit Level was recorded at AR1 and AR2 in the reporting period.

The weather varied from sunny to rainy during the reporting period. Wind direction was mainly north or east in the reporting period. 

The key activities of the Project carried out in the reporting period are summarised in Section 1.5. Those works were not likely to cause adverse dust pollution.

The active construction site is around 3 km away from the nearest air sensitive receiver in Tung Chung. The major dust sources during the reporting period were observed to be local air pollution and nearby traffic emissions. It is considered that the monitoring work in the reporting period was effective and there was no adverse impact attributable to the works of the Project.

2.2      Noise Monitoring

Impact noise monitoring was conducted at five representative monitoring stations once per week during 0700 and 1900 during the reporting period. The locations of monitoring stations are described in Table 2.2 and presented in Figure 2.1. The Action and Limit Levels of the noise monitoring stipulated in the EM&A programme for triggering the relevant investigation and follow-up procedures under the programme are provided in Table 2.2 for reference.

The graphical plot of impact noise quality monitoring results during the reporting period is presented in Graph 2.

Table 2.2: Impact Noise Quality Monitoring Stations

Monitoring Station

Location

Action Level

Limit Level

NM1A

Man Tung Road Park

When one documented complaint is received from any one of the sensitive receivers

75 dB(A)

NM3A

Site Office

75 dB(A)

NM4(i)

Ching Chung Hau Po Woon Primary School

65dB(A) / 70 dB(A)

NM5

Village House in Tin Sum

75 dB(A)

NM6

House No. 1, Sha Lo Wan

75 dB(A)

Note: (i) Reduce to 70dB(A) for school and 65dB(A) during school examination periods.

Graph 2: Graphical Plot of Leq (30min) at NM1A, NM3A, NM4, NM5 and NM6 during the Reporting Period

Note: The examination period for NM4 was from 27 March 2017 to 31 March 2017 in the reporting period.

No exceedance of the Action and Limit Level was recorded at all monitoring stations in the reporting period.

The key activities of the Project carried out in the reporting period are summarised in Section 1.5. Those works were not likely to cause adverse noise impact.

The active construction work is around 900 m away from the nearest noise sensitive receivers in the villages in North Lantau. The major noise sources during the reporting period were observed to be road traffic at NM1A, aircrafts at NM3A, school activities at NM4, aircrafts, helicopters, and dog barking at NM5, and aircrafts, helicopters, and marine vessels at NM6. It is considered that the monitoring work in the reporting period was effective and there was no adverse impact attributable to the works of the Project.

2.3      Water Quality Monitoring

During the reporting period, water quality monitoring was conducted at a total of 22 water quality monitoring stations, comprising 12 impact (IM) stations, seven sensitive receiver (SR) stations, and three control stations in the vicinity of the water quality sensitive receivers around the airport island in accordance with the Manual. The purpose of water quality monitoring at the IM stations is to promptly capture any potential water quality impacts from the Project before the impacts could become apparent at sensitive receivers (represented by the SR stations). Table 2.3 describes the details of the monitoring stations. Figure 2.2 shows the locations of the monitoring stations.

Table 2.3:    Monitoring Locations and Parameters for Impact Water Quality Monitoring

Monitoring Stations

Description

Coordinates

Parameters

Easting

Northing

C1

Control

804247

815620

 

C2

Control

806945

825682

 

C3(3)

Control

817803

822109

 

IM1

Impact

806458

818351

DO, pH, Temperature, Salinity, Turbidity, SS, Total Alkalinity, Heavy Metals(2)

IM2

Impact

806193

818852

IM3

Impact

806019

819411

IM4

Impact

805039

819570

IM5

Impact

804924

820564

IM6

Impact

805828

821060

IM7

Impact

806835

821349

IM8

Impact

807838

821695

IM9

Impact

808811

822094

 

IM10

Impact

809838

822240

IM11

Impact

810545

821501

IM12

Impact

811519

821162

SR1(1)

Future Hong Kong-Zhuhai-Macao Bridge Hong Kong Boundary Crossing Facilities (HKBCF) Seawater Intake for cooling

812586

820069

DO, pH, Temperature, Salinity, Turbidity, SS

 

SR2(3)

Planned marine park / hard corals at The Brothers / Tai Mo To

814166

821463

SR3

Sha Chau and Lung Kwu Chau Marine Park / fishing and spawning grounds in North Lantau

807571

822147

SR4A

Sha Lo Wan

807810

817189

SR5A

San Tau Beach SSSI

810696

816593

SR6

Tai Ho Bay, Near Tai Ho Stream SSSI

814663

817899

SR7

Ma Wan Fish Culture Zone (FCZ)

823742

823636

SR8

Seawater Intake for cooling at Hong Kong International Airport (East)

811593

820417

Notes:

(1)     The seawater intakes of SR1 for the future HKBCF are not yet in operation, the future permanent location for SR1 during impact monitoring is subject to finalisation after the HKBCF seawater intake is commissioned.

(2)   Details of selection criteria for the two heavy metals for early regular DCM monitoring refer to the Detailed Plan on Deep Cement Mixing available on the dedicated 3RS website http://env.threerunwaysystem.com/en/ep-submissions.html). DCM specific water quality monitoring parameters (total alkalinity and heavy metals) were only conducted at C1 to C3, SR2, and IM1 to IM12.

(3)   According to the baseline water quality monitoring report, C3 station is not adequately representative as a control station of impact/ SR stations during the flood tide. The control reference has been changed from C3 to SR2 from 1 September 2016 onwards.

2.3.1      Monitoring Schedule

During the reporting period, general water quality monitoring was conducted three days per week, at mid-flood and mid-ebb tides, at the 22 water quality monitoring stations.

Early regular DCM water quality monitoring was conducted three days per week, at mid-flood and mid-ebb tides, at the 22 water quality monitoring stations from 1 January 2017 to 21 March 2017 during the reporting period. It was suspended after 21 March 2017 because initial intensive DCM monitoring was tentatively started in late March 2017.

2.3.2      Action and Limit Levels for Water Quality Monitoring

The Action and Limit Levels for general water quality monitoring and regular DCM monitoring stipulated in the EM&A programme for triggering the relevant investigation and follow-up procedures under the programme are presented in Table 2.4. The control and impact stations during flood tide and ebb tide for general water quality monitoring and regular DCM monitoring are presented in Table 2.5.

Table 2.4:    Action and Limit Levels for General Water Quality Monitoring and Regular DCM Monitoring

Parameters

Action Level (AL)

Limit Level (LL)

Action and Limit Levels for general water quality monitoring and regular DCM monitoring

(excluding SR1& SR8)

DO in mg/L

(Surface, Middle & Bottom)

Surface and Middle

4.5 mg/L

Surface and Middle

4.1 mg/L

5 mg/L for Fish Culture Zone (SR7) only

Bottom

3.4 mg/L

Bottom

2.7 mg/L

Suspended Solids (SS) in mg/L

23

or 120% of upstream control station at the same tide of the same day, whichever is higher

37

or 130% of upstream control station at the same tide of the same day, whichever is higher

Turbidity in NTU

22.6

36.1

Total Alkalinity in ppm

95

99

Representative Heavy Metals for early regular DCM monitoring

(Chromium)

0.2

0.2

Representative Heavy Metals for early regular DCM monitoring

(Nickel)

3.2

 

3.6

 

Action and Limit Levels SR1

 

 

 

SS (mg/l)

To be determined prior to its commissioning

To be determined prior to its commissioning

Action and Limit Levels SR8

 

 

 

 

SS (mg/l)

52

 

60

 

Notes:

1. For DO measurement, non-compliance occurs when monitoring result is lower than the limits.

2. For parameters other than DO, non-compliance of water quality results when monitoring results is higher than the limits.

3. Depth-averaged results are used unless specified otherwise.

4. Details of selection criteria for the two heavy metals for early regular DCM monitoring refer to the Detailed Plan on Deep Cement Mixing available on the dedicated 3RS website http://env.threerunwaysystem.com/en/ep-submissions.html)

5. The action and limit levels for the two representative heavy metals chosen will be the same as that for the intensive DCM monitoring.

Table 2.5:    The Control and Impact Stations during Flood Tide and Ebb Tide for General Water Quality Monitoring and Regular DCM Monitoring

 

Control Station

Impact Stations

Flood Tide

 

C1

IM1, IM2, IM3, IM4, IM5, IM6, IM7, IM8, SR3

SR2^1

IM7, IM8, IM9, IM10, IM11, IM12, SR1A, SR3, SR4A, SR5A, SR6, SR8

Ebb Tide

 

C1

SR4A, SR5A, SR6

C2

IM1, IM2, IM3, IM4, IM5, IM6, IM7, IM8, IM9, IM10, IM11, IM12, SR1A, SR2, SR3, SR7, SR8

^1 As per findings of Baseline Water Quality Monitoring Report, the control reference has been changed from C3 to SR2 from 1 Sep 2016 onwards.

2.3.3      Summary of Monitoring Results 

The monitoring results for DO, total alkalinity, and chromium obtained during the reporting period were in compliance with their corresponding Action and/or Limit Levels stipulated in the EM&A programme for triggering the relevant investigation and follow-up procedures under the programme if being exceeded. For turbidity, SS and nickel, some of the testing results exceeded the relevant Action and Limit Levels, and the corresponding investigations were conducted accordingly. The investigation findings concluded that all exceedances were not due to the Project. Summaries of turbidity, SS, and nickel compliance status are presented in Table 2.6 to 2.10.

Findings for Turbidity Exceedances

Table 2.6 and Table 2.7 presents a summary of the turbidity compliance status at IM and SR stations during mid-ebb and mid-flood tide for the reporting quarter.

Table 2.6: Summary of Turbidity Compliance Status at IM and SR Stations (Mid-Ebb Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

31/01/2017

 

 

 

 

 

 

 

02/02/2017

 

 

 

 

 

 

 

14/02/2017

 

 

 

 

 

 

 

No. of Turbidity Exceedances

0

0

0

0

1

1

1

2

2

2

1

0

0

2

0

0

0

0

0

Table 2.7: Summary of Turbidity Compliance Status at IM and SR Stations (Mid-Flood Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

02/02/2017

 

 

 

 

 

 

 

11/02/2017

 

 

 

 

 

 

 

14/02/2017

 

 

 

 

 

 

 

16/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Turbidity Exceedances

0

0

0

1

2

0

1

0

0

2

1

1

0

0

0

0

1

0

0

Note: The monitoring dates that are not presented in the above tables were in full compliance with their corresponding Action and Limit Levels. Detailed results are presented in Appendix D.

Legend:

 

No exceedance of Action Level and Limit Level

 

Exceedance of Action Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Action Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Upstream station with respect to the Project during the respective tide based on dominant tidal flow

 

Investigations were conducted for each of the exceedances and details of the investigation findings are presented in the Construction Phase Monthly EM&A Report no. 13, 14, and 15. All exceedances were found to be not due to the Project.

IM Stations

Some of the turbidity exceedances at downstream IM stations occurred with nearby upstream IM stations during the same monitoring period. Based on the investigation findings and given that the upstream stations would unlikely be affected by the Project, these exceedances were possibly due to natural fluctuation of the corresponding areas. Other turbidity exceedances that occurred in this reporting period appeared to be isolated cases with neither temporal nor spatial trend to indicate any effect due to Project activities. Taking into account the investigation findings which showed no construction vessel, DCM work, nor silt plume in the vicinity, the exceedances were considered to be not due to the Project.

 

SR Stations

 

The turbidity exceedances at SR stations in the reporting period occurred only when the respective SR stations were located upstream of the Project. As these upstream stations were unlikely affected by the Project, the exceedances were considered to be not due to the Project.

Findings for SS Exceedances

Table 2.8 and Table 2.9 presents a summary of the SS compliance status at IM and SR stations during mid-ebb and mid-flood tide for the reporting quarter.

Table 2.8: Summary of SS Compliance Status at IM and SR Stations (Mid-Ebb Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

14/01/2017

 

 

 

 

 

 

 

17/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of SS Exceedances

0

1

1

0

1

5

5

2

2

0

1

0

0

1

1

0

0

0

0

Table 2.9: Summary of SS Compliance Status at IM and SR Stations (Mid-Flood Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

03/01/2017

 

 

 

 

 

 

 

12/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/01/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21/02/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

02/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of SS Exceedances

1

4

3

2

1

2

0

0

0

2

1

1

0

0

1

1

7

0

0

Note: The monitoring dates that are not presented in the above tables were in full compliance with their corresponding Action and Limit Levels. Detailed results are presented in Appendix D.

Legend:

 

No exceedance of Action Level and Limit Level

 

Exceedance of Action Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Action Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Upstream station with respect to the Project during the respective tide based on dominant tidal flow

 

Investigations were conducted for each of the exceedances and details of the investigation findings are presented in the Construction Phase Monthly EM&A Report no. 13, 14, and 15. All exceedances were found to be not due to the Project.

IM Stations

Overall, it was observed that the SS exceedances during this reporting period occurred frequently at those IM stations which are located upstream of the 3RS Project. Such exceedances at upstream stations would unlikely be affected by the Project.

Separately, on most dates with exceedances at downstream IM stations, it was observed that exceedances occurred at both upstream and downstream stations on the same monitoring day. Such concurrent (upstream and downstream) exceedances observed at these IM stations on the same monitoring day suggest that there might be other sources of SS that were not related to the Project. Other SS exceedances at downstream IM stations appeared to be isolated cases with neither temporal nor spatial trend to indicate any effect due to Project activities. Taking into account the investigation findings, the details of which are reported in the Construction Phase Monthly EM&A Report no. 13, 14, and 15, the exceedances were considered to be not due to the Project.

SR Stations

Most of the SS exceedances occurred when the respective SR stations were located upstream of the Project. As these upstream stations were unlikely affected by the Project, the exceedances were considered to be not due to the Project.

For the SS exceedance at SR4A during mid-ebb tide, no temporal trend can be observed to indicate any effect due to Project activities. Besides, no similar exceedance at IM stations located between the Project and SR4A was observed in the same monitoring period. It is also noted that similarly high SS levels were observed at the SR station during baseline monitoring, which suggests that such SS elevations are not uncommon under ambient condition due to natural fluctuation.

Findings for Nickel Exceedances

Table 2.10 and Table 2.11 presents a summary of the nickel compliance status at IM stations during mid-flood tide for the reporting quarter.

Table 2.10: Summary of Nickel Compliance Status at IM Stations (Mid-Ebb Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

21/01/2017

No. of nickel Exceedances

0

0

0

0

1

0

0

0

0

0

0

0

 

Table 2.11: Summary of Nickel Compliance Status at IM Stations (Mid-Flood Tide)

Date

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

07/01/2017

21/03/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of nickel Exceedances

0

0

0

0

0

0

0

2

0

0

0

0

 

Note: The monitoring dates that are not presented in the above table were in full compliance with their corresponding Action and Limit Levels. Detailed results are presented in Appendix D.

Legend:

 

No exceedance of Action Level and Limit Level

 

Exceedance of Action Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Action Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located downstream of the Project based on dominant tidal flow

 

Exceedance of Limit Level recorded at monitoring station located upstream of the Project based on dominant tidal flow

 

Upstream station with respect to the Project during the respective tide based on dominant tidal flow

 

Investigations were conducted for each of the exceedances and details of the investigation findings are presented in the Construction Phase Monthly EM&A Report no. 13 and 15. All exceedances were found to be not due to the Project.

IM Stations

For the nickel exceedance at IM5 during mid-ebb tide, the exceedance occurred when IM5 was located upstream of the Project. As the upstream station was unlikely affected by the Project, the exceedance was considered to be not due to the Project.

For the nickel exceedances at IM8 during mid-flood tide, the exceedances appeared to be isolated cases with no observable temporal and spatial trend to indicate any effect due to Project activities. Furthermore, based on investigation findings, no exceedance was recorded at other downstream IM stations that were similarly close, if not closer to the active DCM works during the same monitoring period. Therefore, the exceedances were considered to be not due to the Project.

 

Conclusions

Based on the findings of the exceedance investigations presented in Construction Phase Monthly EM&A Report no. 13, 14 and 15, it was concluded that the exceedances during this reporting quarter were not due to the Project. Hence no SR stations were adversely affected by the Project. All required actions under the Event and Action Plan had been followed. Exceedances appeared to be due to natural fluctuation (such as naturally higher baseline SS levels at individual SR stations) or other sources not related to the Project.

Nevertheless, recognising that the IM stations represent a ‘first line of defence’, the non-project related exceedances identified at IM stations have been attended to as triggers of precautionary measures. As part of the EM&A programme, the construction methods and mitigation measures for water quality will continue to be monitored and opportunities for further enhancement will continue to be explored and implemented where possible, to strive for better protection of water quality and the marine environment. 

In the meantime, the contractors were reminded to implement and maintain all mitigation measures during weekly site inspection. These include maintaining the silt curtain for sand blanket laying properly and maintaining the levels of materials on barges to avoid overflow as recommended in the Manual.

2.4      Waste Monitoring

In accordance with the Manual, the waste generated from construction activities was audited once per week to determine if wastes were being managed in accordance with the Waste Management Plan (WMP) prepared for the Project, contract-specific WMP, and any statutory and contractual requirements. All aspects of waste management including waste generation, storage, transportation and disposal were assessed during the audits. The Action and Limit Levels of the construction waste are provided in Table 2.12.

Table 2.12:       Action and Limit Levels for Construction Waste

Monitoring Stations

Action Level

Limit Level

Construction Area

When one valid documented complaint is received

Non-compliance of the WMP, contract-specific WMPs, any statutory and contractual requirements

Weekly waste monitoring of the Project construction works was carried out by the ET to check and monitor the implementation of proper waste management practices during the construction phase during the reporting period.

Recommendations were provided during monitoring, including provision and maintenance of spill kits, provision of chemical waste storage area for chemical waste, and proper storage of construction material. In addition, relevant contractors were reminded to provide recycling bins for the segregation of recyclables from general refuse. The contractors had taken actions to implement the recommended measures. 

Based on the contractor’s information, about 1578m3 of excavated materials were produced from the HDD launching site and Sheung Sha Chau under P560(R) during the reporting period. The generated excavated materials were temporarily stored at storage and stockpiling area. The excavated material will be reused in the Project.

During the reporting period, around 88 tonnes of general refuse was disposed of to the West New Territories (WENT) Landfill by the advance works contract and DCM contracts. Around 927m3 of Construction and Demolition (C&D) material generated from the DCM contracts was disposed of as public fill in the reporting period. No chemical waste was disposed off-site during the reporting period.

No exceedance of the Action or Limit Levels was recorded in the reporting period.

2.5      CWD Monitoring

2.5.1      Summary of Monitoring Requirements

CWD monitoring was conducted by vessel line-transect survey at a frequency of two full survey per month, supplemented by land-based theodolite tracking and Passive Acoustic Monitoring (PAM). The frequency of the theodolite tracking during the construction phase was one day per month at both Sha Chau (SC) and Lung Kwu Chau (LKC) stations as stipulated in the Manual requirement. Additional theodolite tracking at SC station and LKC station (in total 2 tracking days and 3 tracking days per month at respective stations) were also conducted on a voluntary basis to collect supplementary information for the project. Monitoring was fully completed in the reporting period. The vessel survey transect lines were in line with those proposed in the Manual, which are consistent with the Agriculture, Fisheries and Conservation Department (AFCD) long-term monitoring programme. For the Northwest Lantau (NWL) area, in the previous reporting quarters the transect lines within the works area could largely followed the waypoints conducted for baseline monitoring. However, there was safety concern on the CWD survey vessel travelling within the 3RS works area in this reporting quarter. Therefore, the transect lines for the NWL area were reviewed in February 2017 to follow the waypoints set for construction phase monitoring as proposed in the Manual to avoid entering 3RS works area, with the total length being shorter than previous quarters. The locations of CWD monitoring by vessel survey transect conducted in January 2017 and February to March 2017 are shown in Figure 2.3a and Figure 2.3b respectively, whilst the land-based survey stations are described in Table 2.13 and depicted in Figure 2.4. Location of Passive Acoustic Monitoring is shown in Figure 2.10.

Table 2.13:  Land-based Survey Station Details

Stations

Location

Geographical Coordinates

Station Height (m)

Approximate Tracking Distance (km)

D

Sha Chau (SC)

22° 20’ 43.5” N

113° 53’ 24.66” E

45.66

2

E

Lung Kwu Chau (LKC)

22° 22’ 44.83” N

113° 53’ 0.2” E

70.40

3

The Action Level (AL) and Limit Level (LL) for CWD monitoring were formulated by an action response approach using the running quarterly dolphin encounter rates (STG and ANI) derived from baseline monitoring data, as presented in the CWD Baseline Monitoring Report. The derived values of AL and LL for CWD monitoring are shown in Table 2.14.

Table 2.14:  Derived Values of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring

 

NEL, NWL, AW, WL and SWL as a Whole

Action Level

Running quarterly STG < 1.86 & ANI < 9.35

Limit Level

Two consecutive running quarterly (3-month) STG < 1.86 & ANI < 9.35

2.5.2      Summary of Monitoring Results

Vessel Line-transect Survey

Survey Effort

During the reporting period, six complete sets of vessel line-transect surveys were conducted from January to March 2017 to cover all transects in Northeast Lantau (NEL), NWL, Airport West (AW), West Lantau (WL) and Southwest Lantau (SWL) survey area twice per month.

A total of around 1,375 km of survey effort was collected from these surveys, with around 83.3% of the total survey effort being conducted under favourable weather condition (i.e. Beaufort Sea State 3 or below with favourable visibility). Details of the survey effort data were presented in Appendix E.

CWD Sighting

From January to March 2017, 54 groups of CWDs with 185 individuals were sighted. Amongst the sightings of CWDs, 46 groups with 170 individuals were made during on-effort search under favourable weather condition.

When breaking down the sightings by survey areas, 5 sightings with 16 individuals, 2 sightings with 5 individuals, 33 sightings with 126 individuals and 14 sightings with 38 individuals were recorded in NWL, AW, WL and SWL respectively during the current reporting quarter. No CWD was sighted in NEL survey area. Compared to both last quarter (i.e. October to December 2016) and the same quarter in year 2016 (i.e. January to March 2016), there was a drastic decline of CWD records in NWL, meanwhile a very significant increase in WL. Table 2.15 below shows the comparison of the numbers of sightings and individuals between the current reporting quarter, last quarter and the same quarter of year 2016.

Table 2.15:  Summary of Number of CWD Sightings and Number of CWD Individuals for Previous Quarters and Current Reporting Quarter.

 

Jan to Mar 2016

Oct to Dec 2016

Jan to Mar 2017

NEL

0 (0)

0 (0)

0 (0)

NWL

12 (47)

18 (59)

5 (16)

AW

3 (14)

 0 (0)

2 (5)

WL

7 (29)

25 (63)

33 (126)

SWL

11 (50)

16 (34)

14 (38)

Total

33 (140)

59 (156)

54 (185)

Note: Values in ( ) represent number of CWD individuals

Distribution of CWD sightings recorded from January to March 2017 during on-effort search under favourable weather condition are illustrated in Figure 2.5. CWD sightings were more frequent in WL than in NWL and SWL. In NWL, sightings were mainly recorded around Lung Kwu Chau particularly the western side. Two sightings were recorded in AW survey area with one of them located close to the boundary of 3RS temporary works area. In WL survey area, CWD sightings were quite evenly distributed in both coastal and off-shore waters from the waters north to the Hong Kong-Zhuhai-Macao Bridge Hong Kong Link Road alignment to Fan Lau, with relatively more sightings recorded between Tai O and Yi O. In SWL waters, CWDs sighting locations ranged from Fan Lau to Cheung Sha with several sightings scattered around Soko Islands. Details of the sighting data were presented in Appendix E.

Figure 2.5:        Sightings Distribution of Chinese White Dolphins

[Pink circle: Sighting locations of CWD, White line: Vessel survey transects, Blue polygon: Sha Chau and Lung Kwu Chau Marine Park (SCLKCMP), Green polygon: Brothers Marine Park (BMP), Red polygon: 3RS land-formation footprint, Yellow line: 3RS temporary works area boundary]

Encounter Rate

The dolphin encounter rates for the number of dolphin sightings per 100 km survey effort (STG) and for the total number of dolphins per 100 km survey effort (ANI) in the whole survey area (i.e. NEL, NWL, AW, WL and SWL) for January, February and March 2017 are summarized in Table 2.16.

In this reporting quarter, both the monthly and running quarterly encounter rates STG and ANI increase from January to February 2017 followed by a decline in March 2017. Comparing with the previous reporting quarter, the running quarterly STG remains at 4.02 while the running quarterly ANI increases from 10.95 to 14.85.


 

Table 2.16: Summary of Monthly and Running Quarterly STG and ANI of Chinese White Dolphin for Previous and Current Reporting Quarters

 

Previous Reporting Quarter

Current Reporting Quarter

 

Oct 16

Nov 16

Dec 16

Jan 17

Feb 17

Mar 17

Monthly STG

4.65

2.54

4.89

4.41

6.08

1.99

Monthly ANI

9.81

7.11

15.96

15.78

21.12

8.97

Running Quarterly STG

3.84

3.55

4.02

3.96

5.04

4.02

Running Quarterly ANI

13.02

10.74

10.95

13.02

17.31

14.85

Notes: For detailed calculations of encounter rates STG and ANI, please refer to the Monthly EM&A Reports No. 13, No. 14 and No. 15.

Group Size

Between January and March 2017, the group size of CWDs ranged from 1 to 14 individuals per group. The average group size of CWDs was 3.4 individuals per group while that of last quarter was 2.7. Half of the CWD sightings (i.e. 27 groups) were in small group size (i.e. 1-2 individuals). There were four CWD sightings with large group size (i.e. 10 or above individuals) in this reporting quarter.

In NWL (including AW), CWD sightings with medium group size (i.e. 3-9 individuals) dominated in this reporting quarter. While in WL, CWD groups with small group size were dominant. In SWL, more small-sized CWD groups were recorded. Sighting locations of CWD groups with different group sizes were depicted in Figure 2.6.


 

Figure 2.6: Sighting Locations of Chinese White Dolphins with Different Group Sizes

[Pink circle: Sighting locations of CWD with group size from 1 to 2 individuals, Green circle: Sighting locations of CWD with group size from 3 to 9 individuals, Red circle: Sighting locations of CWD with group size of 10 or above, White line: Vessel survey transects, Blue polygon: Sha Chau and Lung Kwu Chau Marine Park (SCLKCMP), Green polygon: Brothers Marine Park (BMP), Red polygon: 3RS land-formation footprint, Yellow line: 3RS temporary works area boundary]

Activities and Association with Fishing Boats

During January to March 2017, 15 groups of CWDs were sighted with feeding activities.  Amongst these 15 groups of feeding CWDs, 10 groups were observed in association with operating pair fishing boats including gillnetters, purse seiners and pair trawlers in AW, WL and SWL survey areas. The sighting locations of CWDs engaged in different behaviours during the reporting quarter were illustrated in Figure 2.7.


 

Figure 2.7: Sighting Locations of Chinese White Dolphins Engaged in Different Behaviours

[Indigo rhombus: Foraging, Green circle: Socializing, Pink square: Milling/Resting, Yellow triangle: Travelling, White line: Vessel survey transects, Blue polygon: Sha Chau and Lung Kwu Chau Marine Park (SCLKCMP), Green polygon: Brothers Marine Park (BMP), Red polygon: 3RS land-formation footprint, Yellow line: 3RS temporary works area boundary]

Mother-calf Pairs

From January to March 2017, seven sightings of mother-and-unspotted juvenile pairs were recorded. Amongst these seven sightings, a mother-and-unspotted juvenile pair (WLMM071 and WLMM060) were recorded twice, in AW and WL survey areas. The sighting locations of  mother-and-unspotted juvenile pairs were shown in Figure 2.8.

Figure 2.8:        Sighting Locations of Mother-calf Pairs

[Pink circle: Sighting locations of mother-calf pairs, White line: Vessel survey transects, Blue polygon: Sha Chau and Lung Kwu Chau Marine Park (SCLKCMP), Green polygon: Brothers Marine Park (BMP), Red polygon: 3RS land-formation footprint, Yellow line: 3RS temporary works area boundary]

Note: Only on-effort sightings under Beaufort 3 or below were presented in the figure.

Photo Identification

During January to March 2017, a total number of 48 different CWD individuals sighted altogether 83 times were identified. Re-sighting information of CWD individuals provides an initial idea of their range use and apparent connection between different areas around Lantau. Amongst these 48 different CWD individuals, 22 animals (i.e. NLMM004, NLMM015, NLMM017, NLMM037, SLMM010, SLMM011, SLMM014, SLMM015, SLMM018, SLMM021, SLMM031, SLMM036, SLMM037, SLMM049, SLMM052, WLMM001, WLMM007, WLMM008, WLMM043, WLMM060, WLMM068 and WLMM071) were sighted more than once. Nine individuals including SLMM010, SLMM011, SLMM014, SLMM021, SLMM031, SLMM037, WLMM007, WLMM060 and WLMM071 were re-sighted in different survey areas within this reporting quarter. The number of CWD individuals re-sighted more than once and the number of CWD individuals re-sighted in different survey areas during the current reporting quarter were both higher than those of last quarter (i.e. October to December 2016).

A summary of photo identification works is presented in Table 2.17. Representative photos of the 48 identified individuals and figures depicting the sighting locations of the aforementioned 22 re-sighted individuals recorded in this reporting quarter are presented Appendix E.

Table 2.17:  Summary of Photo Identification

Individual ID

Date of sighting

Sighting Group No.

Area

 

Individual ID

Date of sighting

Sighting Group No.

Area

NLMM004

12/01/2017

1

NWL

 

SLMM036

05/01/2017

1

WL

 

23/03/2017

1

NWL

 

 

16/02/2017

10

WL

 

 

2

NWL

 

 

21/03/2017

2

WL

NLMM015

05/01/2017

1

WL

 

SLMM037

19/01/2017

6

SWL

 

21/03/2017

2

WL

 

 

21/03/2017

2

WL

NLMM016

05/01/2017

1

WL

 

SLMM047

16/02/2017

10

WL

NLMM017

12/01/2017

1

NWL

 

SLMM049

16/02/2017

3

WL

 

23/03/2017

1

NWL

 

 

 

10

WL

 

 

2

NWL

 

SLMM052

05/01/2017

7

WL

NLMM019

21/03/2017

2

WL

 

 

16/02/2017

10

WL

NLMM020

21/03/2017

2

WL

 

WLMM001

05/01/2017

6

WL

NLMM037

12/01/2017

1

NWL

 

 

19/01/2017

8

WL

 

23/03/2017

1

NWL

 

WLMM003

16/02/2017

10

WL

 

 

2

NWL

 

WLMM007

13/01/2017

1

SWL

SLMM002

05/01/2017

7

WL

 

 

 

2

SWL

SLMM007

05/01/2017

7

WL

 

 

16/02/2017

10

WL

 

06/02/2017

3

WL

 

WLMM008

21/03/2017

2

WL

SLMM010

05/01/2017

5

WL

 

 

 

3

WL

 

19/01/2017

6

SWL

 

WLMM011

21/03/2017

1

WL

 

16/02/2017

10

WL

 

WLMM017

16/02/2017

10

WL

SLMM011

17/02/2017

2

SWL

 

WLMM021

06/01/2017

1

SWL

 

21/03/2017

2

WL

 

WLMM025

16/02/2017

10

WL

 

 

3

WL

 

WLMM043

16/02/2017

4

WL

SLMM014

05/01/2017

7

WL

 

 

21/03/2017

1

WL

 

16/02/2017

10

WL

 

WLMM056

16/02/2017

10

WL

 

20/03/2017

1

SWL

 

WLMM060

19/01/2017

3

WL

 

 

3

SWL

 

 

16/02/2017

1

AW

SLMM015

21/03/2017

2

WL

 

WLMM063

19/01/2017

3

WL

 

 

3

WL

 

WLMM064

05/01/2017

1

WL

SLMM018

17/02/2017

2

SWL

 

WLMM065

05/01/2017

1

WL

 

 

3

SWL

 

WLMM066

05/01/2017

1

WL

SLMM021

19/01/2017

6

SWL

 

WLMM067

05/01/2017

2

WL

 

21/03/2017

2

WL

 

WLMM068

05/01/2017

2

WL

 

 

3

WL

 

 

19/01/2017

3

WL

SLMM022

16/02/2017

10

WL

 

WLMM069

13/01/2017

2

SWL

SLMM025

16/02/2017

11

WL

 

WLMM070

13/01/2017

2

SWL

SLMM028

21/03/2017

1

WL

 

WLMM071

19/01/2017

3

WL

SLMM030

21/03/2017

1

WL

 

 

06/02/2017

1

WL

SLMM031

17/02/2017

2

SWL

 

 

16/02/2017