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

Construction Phase Quarterly EM&A Report No.7 (1 July to 30 September 2017)

December 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 7

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  12

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 DO (Bottom) Compliance Status (Mid-Flood Tide) 16

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

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

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

Table 2.13: Summary of SS 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) 20

Table 2.16: Action and Limit Levels for Construction Waste  21

Table 2.17: Land-based Survey Station Details  22

Table 2.18: Derived Values of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring  23

Table 2.19: Summary of Number of CWD Sightings and Number of CWD Individuals for Previous Quarters and Current Reporting Period  23

Table 2.20: Summary of Monthly and Running Quarterly STG and ANI of Chinese White Dolphin for Previous and Current Reporting Periods  26

Table 2.21: Summary of Photo Identification  30

Table 2.22: Summary of Survey Effort and CWD Group of Land-based Theodolite Tracking  31

Table 2.23: Summary of the 4th Post-Translocation Monitoring Surveys Completed in April 2017  36

Table 2.24: Summary of Ad-hoc Monitoring of Tagged Corals at Recipient Site  37

Table 2.25: Comparison of tagged natural coral survey results at six survey sites  39

Table 3.1: Statistics for Valid Exceedances for the Environmental Monitoring  42

Table 3.2: Statistics for Non-compliance, Complaints, Notifications of Summons and Prosecution  43

 

 

 

 

 

 

 

 

 

 

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 in Baseline and Construction Phases

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

Figure 2.11

Locations of Six Coral Dive Survey Sites

 

 

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

Appendix E

Summary of Ecological Monitoring Results

Appendix F

Selected Photos of Tagged Corals from Ad-hoc Monitoring

 

 

 

 

 

 

 

 

 

 

 

 


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 7th 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 July 2017 to 30 September 2017.   

Key Activities in the Reporting Period

The key activities of the Project carried out in the reporting period included deep cement mixing (DCM) works and trials, laying of geotextile and sand blanket, site preparation works, site office establishment, seawall construction, horizontal directional drilling (HDD) works, concrete removal works, piling, and excavation 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, and thus terrestrial ecological monitoring on Sheung Sha Chau Island was resumed in August 2017 after the end of the ardeid’s breeding season (between April and July).

Monitoring/ Audit Activities

Number of Sessions

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

102

Noise Monitoring

65

Water Monitoring

40

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

6

Land-based theodolite tracking survey effort for CWD monitoring

15

Terrestrial ecology monitoring

2

 

3203 ad-hoc inspection on Dolphin observer by contractor

Chemical Spill Drill conducted by Contractor

Dolphin Exclusion Zone (DEZ) Monitoring for DCM Works conducted by Contractor

Dolphin Observer Training

In total, 2,170 High Speed Ferry (HSF) movements between HKIA SkyPier and Zhuhai / Macau were audited in the reporting period. 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). Two ferry movements had minor deviations from the diverted route during the reporting period. ET investigated the deviation cases and confirmed that all of them are related to public safety / emergency situations.

On the implementation of the Marine Travel Routes and Management Plan for Construction and Associated Vessel (MTRMP-CAV), the Marine Surveillance System (MSS) 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 Marine Traffic Control Centre (MTCC) representative to comply with the requirements of the MTRMP-CAV. Monthly 3-month rolling programmes for construction vessel activities were provided by contractors for checking to ensure the proposed deployment is necessary and minimal through good planning.

On the implementation of Marine Mammal Watching Plan (MMWP), dolphin observers were deployed by the contractors for laying of open sea silt curtain and laying of silt curtains for sand blanket in accordance with the plan. On the implementation of DEZ Plan, dolphin observers at 12 to 16 dolphin observation stations were deployed for continuous monitoring of the DEZ by the contractors for DCM works and seawall construction 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 were four records of dolphin sighting within the DEZ of DCM works 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)

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

The water quality monitoring results for total alkalinity and chromium obtained during the reporting period did not trigger 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), 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.

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, air quality, noise, water quality, waste management, terrestrial ecology, landscape & visual 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^

 

No project-related Limit Level exceedance was recorded.

Nil

Breaches of Action Level^

 

 

 

No project-related Action Level exceedance was recorded.

Nil

Complaints Received

Two complaints were received on 8 August and 5 September 2017 respectively.

Complaint investigations were carried out in accordance with the Complaint Management Plan. Investigation details are presented in S3.2.1.

Notification of any summons and status of prosecutions

 

No notification of summons or prosecution were received.

Nil

Changes that affect the EM&A

 

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. 21.

1.2      Scope of this Report

This is the 7th 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 July 2017 to 30 September 2017.

1.3      Project Organisation

The Project’s organisation structure is provided in Appendix A. Contact details of the key personnel have been updated and provided in Table 1.1.

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

Roy Man

3922 9376

 

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 Liu

5172 6543

Deep Cement Mixing (DCM) Works:

Contract 3201 DCM (Package 1)

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

Project Director

Tsugunari Suzuki

9178 9689

Environmental Officer

Alan Tam

6119 3107

Contract 3202 DCM (Package 2)

(Samsung-Build King 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

Eric Kan

9014 6758

Environmental Officer

David Hung

9765 6151

Contract 3204 DCM (Package 4)

(CRBC-SAMBO Joint Venture)

Project Manager

Kyung-Sik Yoo

9683 8697

Environmental Officer

Kanny Cho

6799 8226

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

Terminal 2 Expansion Works:

Contract 3501 Antenna Farm and Sewage Pumping Station

(Build King Construction Ltd.)

Project Manager

Osbert Sit

9079 7030

Environmental Officer

Kelvin Cheung

9305 6081

Contract 3502 Terminal 2 APM Depot Modification Works

(Build King Construction Ltd.)

Project Manager

Kivin Cheng

9380 3635

Environmental Officer

Chun Pong Chan

9187 7118

Automated People Mover (APM) Works:

Contract 3602 Existing APM System Modification Works

(Niigata Transys Co., Ltd.)

Project Manager

Kunihiro Tatecho

9755 0351

Environmental Officer

Arthur Wong

9170 3394

Airport Support Infrastructure and Logistic Works:

Contract 3801 APM and BHS Tunnels on Existing Airport Island

(China State Construction Engineering (Hong Kong) Ltd.)

Project Manager

Tony Wong

9642 8672

Environmental Officer

Fredrick Wong

9842 2703

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 works and trials, laying of geotextile and sand blanket, site preparation works, site office establishment, HDD works, concrete removal works, piling, and excavation works.

The locations of the works areas are presented in Figure 1.1 to Figure 1.2.

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 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.

The ecological monitoring has been resumed since August 2017.

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

Passive Acoustic Monitoring (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

DEZ Plan 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 in the reporting period, impact monitoring of air quality, noise, water quality, waste management, terrestrial ecology, landscape and visual, 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  

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

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. 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

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. 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 and helicopters at NM1A, aircrafts and helicopters at NM3A, helicopters and construction activities from a nearby school at NM4, aircrafts and 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 22 water quality monitoring stations, comprising 12 impact (IM) stations, 7 sensitive receiver (SR) stations, and 3 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(4)

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

811418

(from July 2017 onwards)

820246

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.

(4)     The monitoring station for SR8 is subject to future changes due to silt curtain arrangements and the progressive relocation of this seawater intake.

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.

The flood tide monitoring session on 1 July 2017 was cancelled due to marine police blockade of the monitoring area. In addition, the flood tide monitoring session on 22 August 2017 was cancelled due to hoisting Strong Wind Signal No. 3 and adverse sea condition, and the ebb tide monitoring session on 30 September 2017 was cancelled due to hoisting Thunderstorm Signal and adverse sea condition.

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, 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 total alkalinity and chromium 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, SS, 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, and nickel compliance status are presented in Table 2.6 to Table 2.15.

Findings for DO Exceedances

Table 2.6 to Table 2.9 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

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

05/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

2

0

0

0

0

1

2

2

2

1

0

0

0

1

3

0

0

1

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

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

05/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

2

1

0

0

0

0

2

1

1

0

0

0

0

1

2

0

0

0

 

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

SR3

SR4A

SR5A

SR6

SR7

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

1

1

0

0

0

1

0

0

0

0

Table 2.9: Summary of DO (Bottom) Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR3

SR4A

SR5A

SR6

SR7

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Note 1: 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.

Note 2: Standby Signal No. 1 was in force when exceedances were recorded at IM1 and SR4A on 22 August 2017.

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. 19 and 20. All exceedances were found not due to the Project.

It was observed that some of the DO exceedances occurred at stations located upstream of the 3RS Project. Such exceedances at upstream stations would unlikely be affected by the Project, so the investigation focused on exceedance events that occurred at downstream stations.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on the concerned monitoring days were collected and presented in the Construction Phase Monthly EM&A Report no. 19 and 20. It was confirmed that both DCM and sand blanket laying activities were operating normally with silt curtains deployed. No construction vessel nor silt plume was observed in the vicinity of the monitoring stations when exceedances were recorded.

Mid-Ebb Tide

Downstream exceedance events occurred at IM1, IM2, SR4A, and SR7. It was noticed that on the concerned monitoring days, no exceedance was recorded at other downstream monitoring stations, such as IM3 and IM12, which were located closer to active marine construction activities. Lower DO concentrations were also recorded during baseline monitoring at some of these monitoring stations. Based on these findings, the exceedances were possibly due to natural fluctuation in the vicinity of these monitoring stations, and considered not due to the Project.

 

Mid-Flood Tide

Downstream exceedance events occurred at IM8, IM9, and SR3. It was noted that the DO concentration at surface and middle level at C1, the corresponding control station for IM8 and SR3, was also below Action Level during the same tide. Besides, no exceedance was recorded at other monitoring stations, such as IM7 and IM10, which were also located around 500 m from active marine construction activities. Based on these findings, the exceedances were possibly due to natural fluctuation in the vicinity of these monitoring stations, and considered not due to the Project.

Findings for Turbidity Exceedances

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

Table 2.10: 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

26/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

1

0

0

1

0

0

0

0

0

0

0

1

0

0

0

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

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

SR3

SR4A

SR5A

SR6

SR7

26/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

1

0

0

0

1

1

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

It was observed that some of the turbidity exceedances occurred at stations located upstream of the 3RS Project. Such exceedances at upstream stations would unlikely be affected by the project, so the investigation focused on exceedance events that occurred at downstream stations.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on the concerned monitoring days were collected and presented in the Construction Phase Monthly EM&A Report no. 20. It was confirmed that both DCM and sand blanket laying activities were operating normally with silt curtains deployed as additional measures. A construction vessel was observed travelling in the vicinity when monitoring was conducted during mid-flood tide at IM6 on 26 August 2017. No construction works and no leakage of construction material from the vessel was observed.

 

Mid-Ebb Tide

Downstream exceedance events occurred at IM4 and SR4A. It was noticed that the exceedances appeared to be isolated cases with no temporal trend and no clear spatial trend to indicate turbidity rising due to Project activities. It was also noted that no exceedance was recorded at monitoring station IM3, which is located similarly downstream and close to active construction works on 26 August 2017 during ebb tide, while no exceedances were identified in the repeat turbidity measurements. Based on the above, the exceedances were considered not due to the Project, and were possibly due to natural fluctuation in vicinity of IM4 and SR4A.

Mid-Flood Tide

Downstream exceedance events occurred at IM6 and IM10. It was noticed that the turbidity level at bottom levels of IM6 and IM10 were significantly higher than that at surface and middle levels. Similar observations were also found at nearby upstream and downstream impact stations. The observation above suggests that the exceedances were due to high turbidity level at bottom sea level at a broad area regardless of the location relative to active works. It was also noted that the phenomenon coincided with adverse weather condition (Severe Typhoon Hato and Severe Tropical Storm Pakhar) in the period of 22 to 27 August 2017, which could potentially affect the hydrodynamic and sediment transport conditions at bottom sea levels over a wide region. Based on the above, the exceedances were considered not due to the Project, and were possibly due to natural fluctuation in vicinity of IM6 and IM10.

Findings for SS Exceedances

Table 2.12 and Table 2.13 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 2.12: 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

13/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

09/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

0

1

0

1

0

0

0

0

1

0

1

0

0

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

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

IM13

SR3

SR4A

SR5A

SR6

SR7

SR8

24/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

09/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

1

0

0

0

0

0

1

2

3

2

0

0

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

 

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. 19, 20, and 21. All exceedances were found not due to the Project.

It was observed that some of the SS exceedances occurred at stations located upstream of the 3RS Project. Such exceedances at upstream stations would unlikely be affected by the project, so the investigation focused on exceedance events that occurred at downstream stations.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on the concerned monitoring days were collected and presented in the Construction Phase Monthly EM&A Report no. 20 and 21. It was 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.

Mid-Ebb Tide

Downstream exceedance events occurred at IM11, SR4A, and SR6. For the exceedance events at SR4A and SR6, no exceedance was recorded at all impact stations, which were closer to the active works, during the same tide on the same day. For the exceedance event at IM11, there was no observable temporal and spatial trend to indicate any effect due to Project. As there is no evidence of SS release due to Project activities from site observations and all mitigation measures were carried out properly, the exceedances were considered not due to the Project, and were possibly due to natural fluctuation in vicinity of IM11, SR4A, and SR6.

Mid-Flood Tide

Downstream exceedance events occurred at IM9 and IM10. It was found that similar or higher SS levels were apparent at IM11 and IM12 during the same tide on the same day. The investigation also found that the SS levels at bottom sea level were significantly higher and the phenomenon occurred at a broad area regardless of the location relative to active works. The phenomenon also coincided with adverse weather conditions (Severe Typhoon Hato and Severe Tropical Storm Pakhar), which could potentially affect the hydrodynamic and sediment transport conditions at bottom sea levels over a wide region. Based on the above, the exceedances were 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

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

18/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

29/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

31/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

1

1

0

0

0

0

0

3

1

0

1

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

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

06/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

18/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

20/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

22/07/2017

 

 

 

 

 

 

 

 

 

 

 

 

17/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

19/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

31/08/2017

 

 

 

 

 

 

 

 

 

 

 

 

02/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

05/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

09/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

12/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

14/09/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

1

1

8

6

4

3

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

 

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. 19, 20, and 21. All exceedances were found not due to the Project.

It was observed that some of the nickel exceedances occurred at stations located upstream of the 3RS Project. Such exceedances at upstream stations would unlikely be affected by the project, so the investigation focused on exceedance events that occurred at downstream stations.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on the concerned monitoring days were collected and presented in the Construction Phase Monthly EM&A Report no. 19, 20 and 21. It was 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.

Mid-Ebb Tide

Downstream exceedance events occurred at IM2, IM3, and IM12. 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 within the contaminated mud pits by DCM activities. Therefore, elevated nickel concentration due to these activities should be associated with similar elevated SS levels. For these exceedance events, the SS level at these stations were well below the Action and Limit Level, which indicates that the active DCM works had limited or insignificant effect on downstream water quality. Based on the above, the exceedances were considered not due to the Project, and were possibly due to natural fluctuation in vicinity of IM2, IM3, and IM12.

Mid-Flood Tide

Downstream exceedance events occurred at IM6, IM7, IM8, IM9, and IM10. For all exceedance events, the SS level recorded in the same station during the same tide on the same day were well below their corresponding Action or Limit Level. Based on the explanation presented earlier (for mid-ebb tide exceedances), a lack of elevated SS indicates that the active DCM works had limited or insignificant effect on downstream water quality. Therefore, the exceedances were considered not due to the Project, and were possibly due to natural fluctuation in vicinity of IM6, IM7, IM8, IM9, and IM10 respectively.

Conclusions

Based on the findings of the exceedance investigations presented in Construction Phase Monthly EM&A Report no. 19, 20, and 21, 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 explore 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, provision of proper storage area for general refuse and chemical waste, as well as regular segregation and removal of waste. The contractors had taken actions to implement the recommended measures.

Based on the contractor’s information, about 1,856 m3 of excavated materials were produced from the HDD and excavation works in the reporting period. The excavated materials were temporarily stored at the stockpiling area and will be reused in the Project.

In addition, metal and paper were recycled during the reporting period. In the reporting period, around 416 tonnes of general refuse were disposed of to the West New Territories (WENT) Landfill, 395 kg and 9,000 litres of chemical waste were collected by licensed chemical waste collector, around 88 m3 of Construction and Demolition (C&D) material generated from the reclamation contract and Terminal 2 expansion works contract was disposed of as public fill, and around 575 m3 of C&D material was reused in other contracts.

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 surveys per month, supplemented by land-based theodolite tracking and 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. Additional theodolite tracking at the SC station and the 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 matched those proposed in the Manual and transect lines are consistent with those used in the Agriculture, Fisheries and Conservation Department (AFCD) long-term CWD monitoring programme. The locations of CWD monitoring by vessel survey transect conducted from July to September 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. The location of the PAM device 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 July to September 2017 to cover all transects in Northeast Lantau (NEL), Northwest Lantau (NWL), Airport West (AW), West Lantau (WL) and Southwest Lantau (SWL) survey areas twice per month.

A total of around 1,340 km of survey effort was collected from these surveys, with around 84.9% 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 are presented in Appendix D.

CWD Sighting

From July to September 2017, there were in total 93 groups of CWDs with 266 individuals sighted (Table 2.19). Amongst the sightings of CWDs, 76 groups with 227 individuals were made during on-effort searches during favourable weather conditions.

When breaking down the sightings by survey areas, 16 sightings with 40 individuals, one sighting with a single individual, 42 sightings with 116 individuals and 34 sightings with 109 individuals were recorded in NWL, AW, WL and SWL survey areas respectively during the current reporting period. No CWD was sighted in NEL survey area.

Compared to last quarter (i.e. April to June 2017), there are observable increases in CWD records in NWL and SWL. Although there is an increase in number of CWD sightings in WL by 40%, the number of CWD individuals recorded in WL declined by around 24.2%. Overall, there is an observable increase in CWD records in the current reporting quarter (i.e. from July to September 2017) from the last quarter.  

Comparison between the current reporting quarter and the same quarter of last year (i.e. July to September 2016) revealed that the overall CWD records in terms of number of CWD individuals is similar although there is an increase in overall number of sightings.

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

 

July to September 2016

April to June 2017

July to September 2017

NEL

0 (0)

0 (0)

0 (0)

NWL

12 (55)

5 (10)

16 (40)

AW

1 (2)

0 (0)

1 (1)

WL

32 (118)

30 (153)

42 (116)

SWL

21 (101)

23 (63)

34 (109)

Total

66 (276)

58 (226)

93 (266)

Note: Values in ( ) represent number of CWD individuals

Distribution of CWD sightings recorded from July to September 2017 are illustrated in Figure 2.5. In NWL, CWD sightings were mostly recorded in the northwestern part of the survey area, particularly around the western side of Lung Kwu Chau as well as the waters between Lung Kwu Chau and Lung Kwu Tan. Two sightings were recorded in the southwestern part of NWL, one was in close vicinity to the 3RS temporary works area, while another was close to Hong Kong-Zhuhai-Macau Bridge Hong Kong Link Road. In WL, the majority of the CWD sightings were located along the coastal waters from Tai O to Fan Lau, especially the waters around Tai O, Yi O, Peaked Hill (Kai Yet Kok) and Fan Lau. While in SWL, CWD sightings mainly distributed on the transects in the western and central part of the survey area on both coastal and off-shore waters, particularly around the waters from Fan Lau to Fan Lau Tung Wan and the waters west to Soko Islands. Details of the sighting data are presented in Appendix D.

Figure 2.5: Sightings Distribution of Chinese White Dolphins

[Pink circle: Sighting locations of CWD, Black 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]  


Remarks: Please note that there are 93 pink circles on the map indicating the sighting locations of CWD. Some of them were very close to each other and therefore appear overlapped on this sighting distribution map.

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 July, August and September 2017 are summarized in Table 2.20.

In this reporting period, the monthly encounter rates for STG and ANI both increase from July to August 2017 followed by a drop in September 2017. Comparing with the previous reporting period, both the running quarterly STG and ANI increase from 4.45 to 6.68 and from 17.65 to 19.97 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

 

Apr 17

May 17

Jun 17

Jul 17

Aug 17

Sep 17

Monthly STG

2.96

4.21

6.30

6.76

8.11

5.32

Monthly ANI

8.88

25.49

18.64

18.45

24.06

17.73

Running Quarterly STG

3.49

3.06

4.45

5.73

7.03

6.68

Running Quarterly ANI

12.33

14.46

17.65

20.95

20.30

19.97

Notes: For detailed calculations of encounter rates STG and ANI, please refer to the Monthly EM&A Reports No. 19, No. 20 and No. 21.

Group Size

Between July and September 2017, the group size of CWDs ranged from 1 to 15 individuals per group. The average group size of CWDs was 2.9 individuals per group while that of the last quarter was 3.9. Over half of the CWD sightings (i.e. 54 groups) were of small group size (i.e. 1-2 individuals). There was only one CWD sighting with a large group size (i.e. 10 or more individuals) in this reporting period, recorded in NWL.

In NWL and WL, small CWD group size sightings dominated in this reporting period. While in SWL, the number of medium CWD group size sightings (i.e. 3-9 individuals) is slightly higher than sightings with small group size. Sighting locations of CWD groups with different group sizes are 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; Black 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 July to September 2017, 12 groups of CWDs were sighted with feeding activities.  Amongst these 12 groups of feeding CWDs, two groups were observed in association with operating fishing boat (gill netter) in SWL. The sighting locations of CWDs engaged in different behaviours during the reporting period are illustrated in Figure 2.7.


 

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

[Indigo rhombus: Foraging; Green circle: Socializing; Yellow triangle: Travelling; Black 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 July to September 2017, 12 sightings of CWDs were recorded with the presence of mother-and-calf, mother-and-unspotted juvenile and/or mother-and-spotted juvenile pairs. Two-thirds of these mother-calf pairs were sighted in WL. The sighting locations of mother-calf pairs are shown in Figure 2.8.

Figure 2.8: Sighting Locations of Mother-calf Pairs

[Pink circle: Sighting locations of mother-calf pairs; Black 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]



Remarks: Please note that there are 12 pink circles on the map indicating the locations of the sightings with the presences of mother-and-calf, mother-and-unspotted juvenile and/or mother-and-spotted juvenile pairs. Some of them were very close to each other and therefore appear overlapped on this sighting distribution map.

Photo Identification

During July to September 2017, a total number of 76 different CWD individuals were identified altogether 118 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 76 different CWD individuals, 31 animals (i.e. NLMM019, NLMM020, NLMM023, NLMM033, NLMM034, NLMM051, NLMM052, SLMM012, SLMM015, SLMM017, SLMM023, SLMM034, SLMM040, SLMM045, SLMM050, SLMM054, WLMM001, WLMM003, WLMM006, WLMM008, WLMM009, WLMM011, WLMM015, WLMM020, WLMM027, WLMM028, WLMM043, WLMM046, WLMM079, WLMM100 and WLMM101) were sighted for more than once.

Thirteen individuals including NLMM019, NLMM020, NLMM023, NLMM052, SLMM023, WLMM001, WLMM003, WLMM006, WLMM009, WLMM011, WLMM027, WLMM046 and WLMM079 were re-sighted in different survey areas within this reporting period. Amongst these 13 animals, NLMM019, NLMM020, NLMM023, NLMM052 and WLMM027 have cross-area movement between NWL (including AW) and WL or SWL survey area. Whilst SLM023, WLMM001, WLMM003, WLMM006, WLMM009, WLMM011, WLMM046 and WLMM079 have cross-area movement in WL and SWL. Two animals, NLMM020 and NLMM023, have been identified in every month in this reporting period and they are the only animals showing cross-area movement between NWL, WL and SWL during this reporting period. The number of CWD individuals re-sighted for more than once and the number of CWD individuals showing cross-area movement are both higher than last quarter (i.e. April to June 2017).

A summary of photo identification works is presented in Table 2.21. Representative photos of the 76 identified individuals and figures depicting the sighting locations of the aforementioned 31 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

NLMM005

18/09/2017

2

NWL

 

SLMM059

26/07/2017

5

SWL

NLMM013

14/07/2017

1

NWL

 

SLMM060

15/08/2017

2

SWL

NLMM019

12/07/2017

1

NWL

 

SLMM061

15/08/2017

3

SWL

 

12/09/2017

4

WL

 

SLMM062

15/08/2017

5

SWL

 

 

5

WL

 

SLMM063

15/08/2017

7

SWL

 

18/09/2017

1

NWL

 

SLMM064

21/08/2017

5

SWL

NLMM020

12/07/2017

1

NWL

 

WLMM001

11/07/2017

10

WL

 

21/08/2017

4

SWL

 

 

 

13

SWL

 

12/09/2017

4

WL

 

WLMM003

11/07/2017

13

SWL

 

 

5

WL

 

 

22/08/2017

7

WL

 

18/09/2017

1

NWL

 

WLMM006

11/07/2017

12

SWL

NLMM022

18/09/2017

1

NWL

 

 

20/07/2017

3

WL

NLMM023

11/07/2017

13

SWL

 

WLMM008

26/07/2017

3

SWL

 

12/09/2017

5

WL

 

 

22/08/2017

11

SWL

 

18/09/2017

1

NWL

 

WLMM009

11/07/2017

12

SWL

NLMM027

22/08/2017

7

WL

 

 

20/07/2017

3

WL

NLMM028

22/08/2017

7

WL

 

WLMM011

22/08/2017

8

WL

NLMM033

22/08/2017

3

WL

 

 

 

10

SWL

 

 

6

WL

 

 

20/09/2017

3

SWL

NLMM034

11/07/2017

2

WL

 

WLMM013

21/07/2017

2

WL

 

 

5

WL

 

WLMM015

11/07/2017

9

WL

NLMM037

18/09/2017

3

NWL

 

 

21/07/2017