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

Construction Phase Quarterly EM&A Report No.6 (1 April to 30 June 2017)

September 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 4

Table 1.2: Contact Information of the Project 6

Table 1.3: Summary of Status for All Environmental Aspects under the Updated EM&A Manual 6

Table 2.1: Impact Air Quality Monitoring Stations  10

Table 2.2: Impact Noise Quality Monitoring Stations  11

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  14

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 DO (Surface and Middle) Compliance Status (Mid-Ebb Tide) 15

Table 2.7: Summary of DO (Bottom) Compliance Status (Mid-Ebb Tide) 15

Table 2.8: Summary of DO (Surface and Middle) Compliance Status (Mid-Flood Tide) 16

Table 2.9: Summary of Turbidity Compliance Status (Mid-Ebb Tide) 17

Table 2.10: Summary of SS Compliance Status (Mid-Ebb Tide) 17

Table 2.11: Summary of SS Compliance Status (Mid-Flood Tide) 17

Table 2.12: Summary of Chromium Compliance Status (Mid-Ebb Tide) 18

Table 2.13: Summary of Chromium Compliance Status (Mid-Flood Tide) 18

Table 2.14: Summary of Nickel Compliance Status (Mid-Ebb Tide) 19

Table 2.15: Summary of Nickel Compliance Status (Mid-Flood Tide) 19

Table 2.16: Action and Limit Levels for Construction Waste  20

Table 2.17: Land-based Survey Station Details  21

Table 2.18: Derived Values of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring  21

Table 2.19: Summary of Number of CWD Sightings and Number of CWD Individuals for Previous Quarters and Current Reporting Period  22

Table 2.20: Summary of Monthly and Running Quarterly STG and ANI of Chinese White Dolphin for Previous and Current Reporting Periods  24

Table 2.21: Summary of Photo Identification  28

Table 2.22: Summary of Survey Effort and CWD Group of Land-based Theodolite Tracking  29

Table 2.23: Summary of the Post-Translocation Monitoring Surveys Completed in this Reporting Period  34

Table 3.1: Statistics for Valid Exceedances for the Environmental Monitoring  36

Table 3.2: Statistics for Non-compliance, Complaints, Notifications of Summons and Prosecution  36

 

 

 

 

 

 

 

 

 

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 2.3

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

Project Organization Chart

Appendix B

Environmental Mitigation Implementation Schedule (EMIS) for Construction Phase

Appendix C

Graphical Plots of Water Quality Monitoring Results

Appendix D

Summary of Chinese White Dolphin 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 6th 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 April 2017 to 30 June 2017.   

Key Activities in the Reporting Period

Key activities of the Project carried out in the reporting period included deep cement mixing (DCM) trials and works, laying of geotextile and sand blanket, site office establishment, horizontal directional drilling (HDD) works, and submarine cable diversion associated works.

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. Construction works on Sheung Sha Chau Island was suspended during the ardeid’s breeding season (between April and July). The ecological monitoring is therefore suspended.

Monitoring/ Audit Activities

Number of Sessions

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

105

Noise Monitoring

65

Water Monitoring

37

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

6

Land-based theodolite tracking survey effort for CWD monitoring

15

 

20170511_155345

20170505_Vessel

Marine Traffic Control Centre (MTCC) in Operation in the Site Office

Photo Shoot for Photo Identification of CWD

Chemical Spill Drill conducted by the Contractor

In total, 2,543 ferry movements between HKIA SkyPier and Zhuhai / Macau were audited in the reporting period. Except one High Speed Ferry (HSF), all HSFs travelled through the Speed Control Zone (SCZ) with average speed within 15 knots, which complied with the Marine Travel Routes and Management Plan for High Speed Ferries of SkyPier (the SkyPier Plan). Nine ferry movements had minor deviations from the diverted route during the reporting period. ET investigated the speeding and deviation cases and all of them are related to public safety / emergency situations. Three meetings were held with ferry operator (FO) representatives in the reporting period to review and discuss the deviation cases as well as to share experience and recommendations to further strengthen the implementation of the SkyPier Plan.

On the implementation of the Marine Travel Routes and Management Plan for Construction and Associated Vessel (MTRMP-CAV), the upgraded Marine Surveillance System (MSS) launched in March 2017 automatically recorded deviation cases such as speeding, entering no entry zone, and not travelling through the designated gates. ET conducted bi-weekly audit of the system to ensure sufficient information has been provided and the contractors complied with the requirements of the MTRMP-CAV. Trainings were provided for the concerned skippers to facilitate them in familiarising with the requirements of the MTRMP-CAV. Deviations including speeding in the works area, entry from non-designated gates and entering no-entry zones were reviewed by ET. All the concerned captains were reminded by the contractor’s MTCC representative to comply with the requirements of the MTRMP-CAV. Monthly 3-month rolling vessel plan for construction-related vessels were provided by contractors for checking to ensure the proposed deployment is necessary and minimal.

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, teams of at least two dolphin observers, were deployed at 9 to 13 dolphin observation stations for continuous monitoring of the DEZ by the contractors for DCM and water jetting works for submarine cable diversion 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 or the DEZs in this reporting period. Audits of acoustic decoupling for construction vessels were also carried out by ET.

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

Three Limit Level exceedance cases of 1-hour total suspended particulate (TSP) were recorded in the reporting period, and the corresponding investigations were conducted accordingly. The investigation findings concluded that the exceedances were likely due to the adverse ambient air quality, but not due to the Project.

The water quality monitoring results for total alkalinity obtained during the reporting period did not exceed 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 DO, turbidity, suspended solids (SS), chromium, and nickel, some of the testing results exceeded the relevant Action or Limit Levels in 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 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, 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

Three complaints were received on 24 April, 9 May, and 22 May 2017 respectively.

Complaint investigations were 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

 

Summons were received in June 2017 regarding the aviation fuel pipeline diversion works in December 2016.

Judicial process underway.

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 Project works is counted as Breaches of Action or Limit Level.    

 

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 and the contract information was presented in Appendix A of the Construction Phase Monthly EM&A Report No.15.

1.2      Scope of this Report

This is the 6th 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 April 2017 to 30 June 2017.

1.3      Project Organisation

The Project’s organisation structure and the contact details of the key personnel are provided in Appendix A 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

Contract 3212 11kV Submarine Cable Diversion

Project Director

Colman Chan

6193 4729

 

Environmental Officer

Samantha Kong

3995 8141

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

9724 6254

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

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

Key activities of the Project carried out in the reporting period included DCM trials and works, laying of geotextile and sand blanket, site office establishment, HDD works, and submarine cable diversion associated works.

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 Table 1.3. 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

Completed in May 2017. Data analysis in-progress.

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.

Construction works on Sheung Sha Chau Island was suspended during the ardeid’s breeding season (between April and July). The ecological monitoring is therefore suspended.

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, 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 B.

 

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  

Three Limit Level exceedance cases of air quality monitoring were recorded at AR2 on 10 May 2017 in the 1-hour TSP monitoring. Actions were taken accordingly based on the established Event and Action Plan as presented in the Manual. No major construction dust emission source was observed from the field investigation. It was also confirmed with the contractors that no major dusty construction works was undertaken when the exceedances were recorded. Dust suppression measures were properly implemented by relevant contractors during the monitoring period. Investigation found that Hong Kong was being affected by an airstream with high background pollutant concentration and poor atmospheric conditions for pollutant dispersion on the monitoring day, thus the exceedances were likely due to the adverse ambient air quality, but not due to Project activities.

The weather varied from sunny to rainy during the reporting period. Wind direction was mainly south or southwest 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) Reduced 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: School examination took place from 5 to 9 June 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 and helicopters at NM3A, school activities at NM4, helicopters 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 23 water quality monitoring stations, comprising 12 impact (IM) stations, one mobile IM station, 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

IM13

Impact (for submarine 11 kV cable diversion)

Mobile station (500 m envelope of water jetting works)

DO, pH, Temperature, Salinity, Turbidity, SS

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, hence no water quality impact monitoring was conducted at this station. 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 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 IM / 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 and regular DCM water quality monitoring were conducted three days per week, at mid-flood and mid-ebb tides, at the 23 water quality monitoring stations.

As confirmed by Contract 3212, the 11kV submarine cable diversion and associated works were conducted in the period of 1 to 10 April, 14 to 17 April, 8 to 19 May, and 21 to 23 May 2017. The cable diversion and associated works were substantially completed on 23 May 2017. Therefore, general water quality monitoring was conducted at the mobile impact station of IM13 at mid-flood and mid-ebb tides during the construction period and ceased after 23 May 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 IM 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, IM13, 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, IM13, 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 total alkalinity obtained during the reporting period did not exceed 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 DO, turbidity, suspended solids (SS), chromium, and nickel, some of the testing results exceeded the relevant Action or Limit Levels in the reporting period, and the corresponding investigations were conducted accordingly. The investigation findings concluded that the exceedances were not due to the Project. Summaries of DO, turbidity, SS, chromium, and nickel compliance status are presented in Table 2.6 to Table 2.15.

Findings for DO Exceedances

Table 2.6, Table 2.7 and Table 2.8 present a summary of the DO compliance status at IM and SR stations during mid-ebb and mid flood tide for the reporting period.

Table 2.6: Summary of DO (Surface and Middle) Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

3

1

1

1

1

2

2

1

1

0

2

1

0

3

2

0

0

3

Table 2.7: Summary of DO (Bottom) Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

1

2

0

1

1

0

1

0

2

0

1

0

1

1

0

0

1

Table 2.8: Summary of DO (Surface and Middle) Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

1

0

0

0

1

2

3

2

1

2

1

0

3

0

0

0

3

Note: The monitoring results on monitoring dates not presented in the above tables did not exceed their corresponding Action or Limit Levels. Detailed results are presented in Appendix C.

Legend:

 

No exceedance of Action 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. 18. All exceedances were found not due to the Project.

The monitoring results, including results from repeat measurements, showed that DO (Surface and Middle) and DO (Bottom) results at the control stations as well as some upstream impact stations were low (and mostly below Action or Limit Level) from 20 to 25 June 2017. This indicates that low DO was occurring over a larger area including areas well outside the influence of the Project’s activities, which suggests the likelihood of sources and/or causes originating outside of the Project boundaries. Besides, the DO pattern as shown in Appendix C which shows a widespread decline in DO levels across all monitoring stations from 15 June 2017 onwards appears to be a result of the aftermath of a severe weather condition (i.e. Severe Tropical Storm Merbok followed by a period of continuous rainfall) in Hong Kong between 12 and 21 June 2017.

Separately, investigations were carried out and confirmed that both DCM and sand blanket laying activities were operating normally with silt curtains deployed as additional measures. No construction vessel nor silt plume was observed in the vicinity of the monitoring stations when exceedances were recorded.

Combining the monitoring results during ebb and flood tides from 15 June 2017 onwards, as well as the observations during water quality monitoring, it is concluded that the patterns of exceedances indicate a macro-scale event affecting the DO concentration in the north Lantau water, rather than local sources. Therefore, the exceedances were considered not due to the Project.

Findings for Turbidity Exceedances

Table 2.9 presents a summary of the turbidity compliance status at IM and SR stations during mid-ebb tide for the reporting period.

Table 2.9: Summary of Turbidity Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR2

SR3

SR4A

SR5A

SR6

SR7

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

Note: The monitoring results on monitoring dates not presented in the above table did not exceed their corresponding Action or Limit Levels. Detailed results are presented in Appendix C.

Legend:

 

No exceedance of Action 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

 

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

Investigation was conducted for the exceedance and details of the investigation findings are presented in the Construction Phase Monthly EM&A Report no. 18. The exceedance was found not due to the Project.

The Action Level exceedance occurred at a monitoring station which was located upstream of the Project during ebb tide, which would unlikely be affected by the Project. Therefore, the exceedance was considered not due to the Project.

Findings for SS Exceedances

Table 2.10 and Table 2.11 present a summary of the SS compliance status at IM and SR stations during mid-ebb and mid-flood tide for the reporting period.

Table 2.10: Summary of SS Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

IM13

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

01/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

Table 2.11: Summary of SS Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

IM13

SR2

SR3

SR4A

SR5A

SR6

SR7

SR8

01/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

2

0

1

0

0

0

0

0

0

0

0

0

1

0

1

0

0

Note: The monitoring results on monitoring dates not presented in the above table did not exceed their corresponding Action or Limit Levels. Detailed results are presented in Appendix C.

Legend:

 

No exceedance of Action 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

 

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

 

No water quality monitoring conducted at IM13 when Contract 3212 had no water jetting works

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. 16. All exceedances were found not due to the Project.

Some exceedances occurred at monitoring stations which were located upstream of the Project. As such upstream stations would unlikely be affected by the Project, the investigation focused on the exceedances at stations located downstream of the Project and hence might be affected by the Project’s activities.

For the exceedance at SR2 on 1 April 2017 during mid-ebb tide, no exceedance was recorded at all downstream IM stations which were located closer to the active works by the Project. Therefore, the exceedance was unlikely to be affected by the Project.

For the exceedance at IM6 on 29 April 2017 during mid-flood tide, it appeared to be an isolated case 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. 16, the exceedance was considered not due to the Project.

Findings for Chromium Exceedances

Table 2.12 and Table 2.13 present a summary of the chromium compliance status at IM stations during mid-ebb and mid-flood tide for the reporting period.

Table 2.12: Summary of Chromium Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

1

0

0

0

0

0

Table 2.13: Summary of Chromium Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

01/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

1

0

0

0

0

0

Note: The monitoring results on monitoring dates not presented in the above table did not exceed their corresponding Action or Limit Levels. Detailed results are presented in Appendix C.

Legend:

 

No exceedance of Action 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

 

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. 16 and 18. All exceedances were found not due to the Project

For the exceedance at IM7 during mid-ebb tide on 4 June 2017, as the exceedance occurred at a monitoring station located upstream during ebb tide, it was considered not due to the Project.

For the exceedance at IM7 during mid-flood tide on 1 April 2017, it appeared to be an isolated case with no observable temporal and spatial trend to indicate any effect due to Project activities. Furthermore, no exceedance was recorded at other downstream monitoring station located closer to active DCM works during the same monitoring period. Based on these findings, the exceedance was considered not due to the Project.

Findings for Nickel Exceedances

Table 2.14 and Table 2.15 presents a summary of the nickel compliance status at IM stations during mid-ebb and mid-flood tide for the reporting period.

Table 2.14: Summary of Nickel Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

23/05/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

0

0

1

0

0

Table 2.15: Summary of Nickel Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

04/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

08/04/2017

 

 

 

 

 

 

 

 

 

 

 

 

09/05/2017

 

 

 

 

 

 

 

 

 

 

 

 

18/05/2017

 

 

 

 

 

 

 

 

 

 

 

 

25/05/2017

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

1

3

3

4

2

1

1

Note: The monitoring results on monitoring dates not presented in the above table did not exceed their corresponding Action or Limit Levels. Detailed results are presented in Appendix C.

Legend:

 

No exceedance of Action 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. 16, 17, and 18. All exceedances were found not due to the Project.

For the exceedance at IM10 during mid-ebb tide on 23 May 2017, as the exceedance occurred at a monitoring station located upstream during ebb tide, it was considered not due to the Project.

For the exceedance events during mid-flood tide, it was observed that overall these occurred dis-continuously (i.e. no repeated exceedances during consecutive monitoring days), while some of the exceedances (those recorded on 4 and 8 April, 18 and 25 May, and 24 June 2017) were also isolated (singular) cases with no observable trend to indicate any effect due to Project activities.

For the exceedances recorded on 9 May and 20 June 2017, it is noted that no SS exceedance was recorded during the same monitoring period. As nickel is a representative heavy metal that indicates the potential for release of contaminants from contaminated mud pits due to the disturbance of marine sediment in contaminated mud pits by DCM activities, the low SS levels indicate that the active DCM works had limited or insignificant effect on downstream water quality. In addition, some of the exceedance events occurred at upstream stations in the reporting period, which might indicate potential nickel source originating from areas outside of the project boundary.

Nevertheless, all exceedances were investigated and taking into account the investigation findings, the details of which are reported in the Construction Phase Monthly EM&A Report nos. 16, 17 and 18, the exceedances were considered not due to the Project.

Conclusions

Based on the findings of the exceedance investigations presented in Construction Phase Monthly EM&A Report no. 16, 17, and 18, it was concluded that the exceedances during this reporting period 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 due to natural fluctuation 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 monitor and opportunities for further enhancement will continue to explored and implement 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 2.16.

Table 2.16: 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 and drip trays, and provision of proper storage area for general refuse, chemical and chemical waste. 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 2,203 m3 of excavated materials were produced from the HDD launching site under P560(R) during the reporting period. The generated excavated materials were temporarily stored at the stockpiling area. The excavated material will be reused in the Project.

In addition, metal and paper were recycled during the reporting period. Around 292 tonnes of general refuse was disposed of to the West New Territories (WENT) Landfill by the advance works contract and DCM contracts, 0.08 tonnes and 1,600 litres of chemical waste were collected by licensed chemical waste collector. Around 1,281 m3 of Construction and Demolition (C&D) material generated from the DCM contracts was disposed of as public fill in 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. The locations of CWD monitoring by vessel survey transect conducted from April to June 2017 are shown in Figure 2.3, whilst the land-based survey stations are described in Table 2.17 and depicted in Figure 2.4. Location of Passive Acoustic Monitoring is shown in Figure 2.10.

Table 2.17: 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 2.18.

Table 2.18: 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 April to June 2017 to cover all transects in Northeast Lantau (NEL), Northwest Lantau (NWL), Airport West (AW), West Lantau (WL) and Southwest Lantau (SWL) survey area twice per month.

A total of around 1,344 km of survey effort was collected from these surveys, with around 88.6% 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 D.

CWD Sighting

From April to June 2017, there were total 58 groups of CWDs with 226 individuals sighted (Table 2.19). Amongst the sightings of CWDs, 53 groups with 210 individuals were made during on-effort search under favourable weather condition.

When breaking down the sightings by survey areas, 5 sightings with 10 individuals, 30 sightings with 153 individuals and 23 sightings with 63 individuals were recorded in NWL, WL and SWL respectively during the current reporting period. No CWD was sighted in NEL and AW survey areas. Compared to both last quarter (i.e. January to March 2017) and the same quarter in year 2016 (i.e. April to June 2016), there was an observable increase in CWD records in SWL. Table 2.19 below shows the comparison of the numbers of sightings and individuals between the current reporting period, last quarter and the same quarter of year 2016.

Table 2.19: Summary of Number of CWD Sightings and Number of CWD Individuals for Previous Quarters and Current Reporting Period

 

Apr to Jun 2016

Jan to Mar 2017

Apr to Jun 2017

NEL

0 (0)

0 (0)

0 (0)

NWL

4 (20)

5 (16)

5 (10)

AW

0 (0)

2 (5)

0 (0)

WL

30 (123)

33 (126)

30 (153)

SWL

12 (42)

14 (38)

23 (63)

Total

46 (185)

54 (185)

58 (226)

Note: Values in ( ) represent number of CWD individuals

Distribution of CWD sightings recorded from April to June 2017 are illustrated in Figure 2.5. In NWL, CWD sightings were mainly recorded near the coastal waters northwestern off Lung Kwu Chau and also the waters between Lung Kwu Chau and Black Point (Lan Kok Tsui). In WL survey area, CWD sightings were distributed in coastal waters from Tai O to Fan Lau and also off-shore waters from Tai O to Peaked Hill. In SWL waters, CWDs sighting locations ranged from Fan Lau to Tong Fuk particularly the waters around Fan Lau Tung Wan and also the waters between Soko Islands and Lantau. Details of the sighting data were presented in Appendix D.

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 April, May and June 2017 are summarized in Table 2.20.

In this reporting period, the monthly encounter rate STG increase from April to June 2017 while the monthly encounter rate ANI increase from April to May 2017 followed by a decline in June 2017. Comparing with the previous reporting period, both the running quarterly STG and ANI increases from 4.02 to 4.45 and from 14.85 to 17.65 respectively.


 

Table 2.20: Summary of Monthly and Running Quarterly STG and ANI of Chinese White Dolphin for Previous and Current Reporting Periods

 

Previous Reporting Period

Current Reporting Period

 

Jan 17

Feb 17

Mar 17

Apr 17

May 17

Jun 17

Monthly STG

4.41

6.08

1.99

2.96

4.21

6.30

Monthly ANI

15.78

21.12

8.97

8.88

25.49

18.64

Running Quarterly STG

3.96

5.04

4.02

3.49

3.06

4.45

Running Quarterly ANI

13.02

17.31

14.85

12.33

14.46

17.65

Notes: For detailed calculations of encounter rates STG and ANI, please refer to the Monthly EM&A Reports No. 16, No. 17 and No. 18.

Group Size

Between April and June 2017, the group size of CWDs ranged from 1 to 13 individuals per group. The average group size of CWDs was 3.9 individuals per group while that of last quarter was 3.4. Half of the CWD sightings (i.e. 29 groups) were in medium group size (i.e. 3-9 individuals). There were three CWD sightings with large group size (i.e. 10 or above individuals) in this reporting period and they were recorded in WL.

In NWL, CWD sightings with small group size (i.e. 1-2 individuals) dominated in this reporting period. While in WL, CWD groups with medium 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 April to June 2017, 21 groups of CWDs were sighted with feeding activities.  Amongst these 21 groups of feeding CWDs, only one group was observed in association with operating fishing boat (purse seiner) in SWL. The sighting locations of CWDs engaged in different behaviours during the reporting period 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 April to June 2017, 15 sightings of CWDs were recorded with the presence of mother-and-calf, mother-and-unspotted juvenile and/or mother-and-spotted juvenile pairs. Most of these mother-calf pairs were sighted in WL. The record in NWL was the mother-and-spotted juvenile pair (NLMM006 and NLMM013). This pair has not been re-sighted since December 2016 and was sighted again in June 2017. The sighting locations of mother-calf 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]

Photo Identification

During April to June 2017, a total number of 67 different CWD individuals were identified altogether 101 times. Re-sighting information of CWD individuals provides an initial idea of their range use and apparent connection between different areas around Lantau. Amongst these 67 different CWD individuals, 24 animals (i.e. NLMM004, NLMM016, SLMM011, SLMM014, SLMM022, SLMM023, SLMM027, SLMM028, SLMM052, WLMM004, WLMM007, WLMM008, WLMM009, WLMM030, WLMM043, WLMM060, WLMM068, WLMM071, WLMM076, WLMM078, WLMM079, WLMM082, WLMM084 and WLMM086) were sighted more than once. Nine individuals including NLMM016, SLMM011, SLMM027, SLMM052, WLMM004, WLMM008, WLMM009, WLMM076 and WLMM078 were re-sighted in different survey areas within this reporting period. NLMM016 has cross-area movement in NWL and WL while others have cross-area movement in WL and SWL. The number of CWD individuals re-sighted more than once was slighted higher than last quarter (i.e. January to March 2017) while the number of CWD individuals re-sighted in different survey areas during the current reporting period remain unchanged compared with last quarter.

A summary of photo identification works is presented in Table 2.21. Representative photos of the 67 identified individuals and figures depicting the sighting locations of the aforementioned 24 re-sighted individuals recorded in this reporting period are presented Appendix D.

Table 2.21: Summary of Photo Identification

Individual ID

Date of sighting

Sighting Group No.

Area

 

Individual ID

Date of sighting

Sighting Group No.

Area

NLMM001

11-May-17

3

WL

 

WLMM009

09-Jun-17

4

SWL

NLMM004

05-Apr-17

1

NWL

 

28-Jun-17

8

WL

2

NWL

 

WLMM018

11-May-17

8

WL

NLMM006

08-Jun-17

1

NWL

 

WLMM027

22-Jun-17

4

SWL

NLMM013

08-Jun-17

1

NWL

 

WLMM030

18-Apr-17

2

WL

NLMM016

05-Apr-17

1

NWL

 

3

WL

2

NWL

 

WLMM040

09-Jun-17

1

WL

18-Apr-17

1

WL

 

WLMM042

11-May-17

3

WL

NLMM023

11-May-17

1

WL

 

WLMM043

05-May-17

1

WL

SLMM007

11-May-17

9

WL

 

09-Jun-17

1

WL

SLMM010

11-May-17

10

SWL

 

WLMM052

28-Jun-17

2

WL

SLMM011

11-May-17

11

SWL

 

WLMM060

18-Apr-17

2

WL

28-Jun-17

5

WL

 

3

WL

SLMM014

22-Jun-17

2

SWL

 

WLMM063

07-Jun-17

2

SWL

3

SWL

 

WLMM064

26-Apr-17

3

SWL

6

SWL

 

WLMM068

18-Apr-17

2

WL

7

SWL

 

3

WL

SLMM015

04-May-17

1

SWL

 

WLMM070

11-May-17

11

SWL

SLMM021

26-Apr-17

1

SWL

 

WLMM071

18-Apr-17

2

WL

SLMM022

05-May-17

4

WL

 

3

WL

5

WL

 

WLMM072

18-Apr-17

2

WL

SLMM023

05-May-17

4

WL

 

WLMM073

11-May-17

8

WL

5

WL

 

WLMM075

18-Apr-17

2

WL

11-May-17

3

WL

 

WLMM076

05-May-17

1

WL

8

WL

 

22-Jun-17

1

SWL

SLMM027

11-May-17

3

WL

 

WLMM077

05-May-17

1

WL

8

WL

 

WLMM078

05-May-17

1

WL

07-Jun-17

2

SWL

 

22-Jun-17

1

SWL

SLMM028

18-Apr-17

5

WL

 

WLMM079

05-May-17

4

WL

05-May-17

5

WL

 

5

WL

SLMM031

07-Jun-17

1

SWL

 

WLMM080

11-May-17

2

WL

SLMM036

07-Jun-17

3

SWL

 

WLMM081

11-May-17

2

WL

SLMM040

22-Jun-17

1

SWL

 

WLMM082

11-May-17

2

WL

SLMM047

11-May-17

8

WL

 

4

WL

SLMM052

05-May-17

4

WL

 

WLMM083

11-May-17

2

WL

5

WL

 

WLMM084

11-May-17

3

WL

11-May-17

10

SWL

 

7

WL

07-Jun-17

2

SWL

 

WLMM085

11-May-17

4

WL

SLMM054

18-Apr-17

7

SWL

 

WLMM086

11-May-17

5

WL

SLMM055

26-Apr-17

4

SWL

 

 

09-Jun-17

1

WL

SLMM056

11-May-17

11

SWL

 

 

 

3

WL

SLMM057

22-Jun-17

1

SWL

 

WLMM087

11-May-17

5

WL

SLMM058

22-Jun-17

5

SWL

 

WLMM088

11-May-17

8

WL

WLMM004

05-May-17

4

WL

 

WLMM089

11-May-17

8

WL

 

5

WL

 

WLMM090

09-Jun-17

1

WL

07-Jun-17

2

SWL

 

WLMM091

28-Jun-17

3

WL

WLMM007

05-May-17

1

WL

 

WLMM092

28-Jun-17

3

WL

11-May-17

6

WL

 

WLMM093

28-Jun-17

6

WL

WLMM008

11-May-17

7

WL

 

WLMM094

28-Jun-17

6

WL

22-Jun-17

1

SWL

 

WLMM095

28-Jun-17

6

WL

 

 

 

 

WLMM096

28-Jun-17

8

WL

Land-based Theodolite Tracking

Survey Effort

During April to June 2017, a total of 15 days of land-based theodolite tracking survey effort were completed, including nine days on Lung Kwu Chau and six days on Sha Chau. In total, 17 CWD groups were tracked from the Lung Kwu Chau station, with 0.19 CWD groups sighted per survey effort hour. No CWDs were sighted from the Sha Chau station during the current reporting period.

Information on survey effort and CWD groups sighted during land-based theodolite tracking surveys are presented in Table 2.22. Details on the survey effort and CWD groups tracked are presented in Appendix D. The first sighting locations of CWD groups tracked between April and June 2017 are shown in Figure 2.9.

Table 2.22: Summary of Survey Effort and CWD Group of Land-based Theodolite Tracking

Land-based Station

# of Survey Sessions

Survey Effort (hh:mm)

# CWD Groups Sighted

CWD Group Sighting per Survey Hour

April 2017

Lung Kwu Chau

3

18:00

6

0.33

Sha Chau

2

12:00

0

0

TOTAL

5

30:00

6

0.20

May 2017

Lung Kwu Chau

3

18:00

2

0.11

Sha Chau

2

12:00

0

0

TOTAL

5

30:00

2

0.07

June 2017

Lung Kwu Chau

3

18:03

9

0.50

Sha Chau

2

12:00

0

0

TOTAL

5

30:03

9

0.30

OVERALL

15

90:03

17

0.19

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

[Green triangle: LKC station; Green square: CWD group off LKC; Blue line: SCLKCMP boundary]

 

Progress Update on Passive Acoustic Monitoring (PAM)

An Ecological Acoustic Recorder (EAR) has been deployed and positioned to the south of Sha Chau Island with 20% duty cycle (Figure 2.10) with data from the EAR intended primarily to supplement the data collected from the land-based theodolite station on Sha Chau. The EAR deployment generally lasts around 4-6 weeks followed by a period of data retrieval for subsequent analysis. As the data analysis takes more than two months after retrieval, PAM results are not suitable for reporting in quarterly reports.  Detailed analysis of PAM data will be presented in the annual CWD report to coincide and supplement the data collected from the land-based theodolite survey station at Sha Chau.

Site Audit for CWD-related Mitigation Measures