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

Construction Phase Monthly EM&A Report No.18 (For June 2017)

July 2017

 

 

 

 

 

 

Contents

Executive Summary

1      Introduction

1.1    Background

1.2    Scope of this Report

1.3    Project Organisation

1.4    Summary of Construction Works

1.5    Summary of EM&A Programme Requirements

2      Air Quality Monitoring

2.1    Monitoring Stations

2.2    Monitoring Requirements and Schedule

2.3    Monitoring Equipment

2.4    Monitoring Methodology

2.4.1     Measuring Procedure

2.4.2     Maintenance and Calibration

2.5    Analysis and Interpretation of Monitoring Results

3      Noise Monitoring

3.1    Monitoring Stations

3.2    Monitoring Requirements and Schedule

3.3    Monitoring Equipment

3.4    Monitoring Methodology

3.4.1     Monitoring Procedure

3.4.2     Maintenance and Calibration

3.5    Analysis and Interpretation of Monitoring Results

4      Water Quality Monitoring

4.1    Monitoring Stations

4.2    Monitoring Requirements and Schedule

4.2.1     Action and Limit Levels for Water Quality Monitoring

4.3    Monitoring Equipment

4.4    Monitoring Methodology

4.4.1     Measuring Procedure

4.4.2     Maintenance and Calibration

4.4.3     Laboratory Measurement / Analysis

4.5    Analysis and Interpretation of Monitoring Results

4.5.1     Summary of Monitoring Results

4.5.2     Summary of Findings for Investigation of Exceedances

5      Waste Management

5.1    Monitoring Requirements

5.2    Waste Management Status

6      Chinese White Dolphin Monitoring

6.1    CWD Monitoring Requirements

6.2    CWD Monitoring Transects and Stations

6.2.1     Small Vessel Line-transect Survey

6.2.2     Land-based Theodolite Tracking

6.3    CWD Monitoring Methodology

6.3.1     Small Vessel Line-transect Survey

6.3.2     Photo Identification

6.3.3     Land-based Theodolite Tracking

6.4    Monitoring Results and Observations

6.4.1     Small Vessel Line-transect Survey

6.4.2     Photo Identification

6.4.3     Land-based Theodolite Tracking

6.5    Progress Update on Passive Acoustic Monitoring

6.6    Site Audit for CWD-related Mitigation Measures

6.7    Timing of Reporting CWD Monitoring Results

6.8    Summary of CWD Monitoring

7      Environmental Site Inspection and Audit

7.1    Environmental Site Inspection

7.2    Audit of Route Diversion and Speed Control of the SkyPier High Speed Ferries

7.3    Audit of Construction and Associated Vessels

7.4    Implementation of Dolphin Exclusion Zone

7.5    Ecological Monitoring

7.6    Status of Submissions under Environmental Permits

7.7    Compliance with Other Statutory Environmental Requirements

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

7.8.1     Complaints

7.8.2     Notifications of Summons or Status of Prosecution

7.8.3     Cumulative Statistics

8      Future Key Issues and Other EIA & EM&A Issues

8.1    Construction Programme for the Coming Reporting Period

8.2    Key Environmental Issues for the Coming Reporting Period

8.3    Monitoring Schedule for the Coming Reporting Period

9      Conclusion and Recommendation

 

 

Tables

Table 1.1: Contact Information of Key Personnel 4

Table 1.2: Summary of status for all environmental aspects under the Updated EM&A Manual 6

Table 2.1:  Locations of Impact Air Quality Monitoring Stations  8

Table 2.2:  Action and Limit Levels for 1-hour TSP  8

Table 2.3:  Air Quality Monitoring Equipment 8

Table 2.4: Summary of 1-hour TSP Monitoring Results  9

Table 3.1: Locations of Impact Noise Monitoring Stations  10

Table 3.2: Action and Limit Levels for Construction Noise  10

Table 3.3: Noise Monitoring Equipment 11

Table 3.4: Summary of Construction Noise Monitoring Results  12

Table 4.1: Monitoring Locations and Parameters for Impact Water Quality Monitoring  13

Table 4.2: Action and Limit Levels for General Water Quality Monitoring and Regular DCM Monitoring  14

Table 4.3: The Control and Impact Stations during Flood Tide and Ebb Tide for General Water Quality Monitoring and Regular DCM Monitoring  15

Table 4.4: Water Quality Monitoring Equipment 15

Table 4.5: Other Monitoring Equipment 15

Table 4.6: Laboratory Measurement/ Analysis of SS and Heavy Metals  17

Table 4.7: Summary of DO (Surface and Middle) Compliance Status (Mid-Ebb Tide) 17

Table 4.8: Summary of DO (Bottom) Compliance Status (Mid-Ebb Tide) 18

Table 4.9: Summary of Findings from Investigations of DO Exceedances  19

Table 4.10: Summary of DO (Surface and Middle) Compliance Status (Mid-Flood Tide) 19

Table 4.11: Summary of Turbidity Compliance Status (Mid-Ebb Tide) 21

Table 4.12: Summary of Chromium Compliance Status (Mid-Ebb Tide) 22

Table 4.13: Summary of Nickel Compliance Status (Mid-Flood Tide) 22

Table 5.1: Action and Limit Levels for Construction Waste  25

Table 6.1: Derived Values of Action Level (AL) and Limit Level (LL) for Chinese White Dolphin Monitoring  26

Table 6.2: Coordinates of Transect Lines in NEL, NWL, AW, WL and SWL Survey Areas  27

Table 6.3: Land-based Survey Station Details  28

Table 6.4: Comparison of CWD Encounter Rates of the Whole Survey Area with Action Levels  32

Table 6.5: Summary of Photo Identification  33

Table 6.6: Summary of Survey Effort and CWD Group of Land-based Theodolite Tracking  33

Table 7.1: Summary of Key Audit Findings against the SkyPier Plan  37

Table 7.2: Status of Submissions under Environmental Permit 39

 

 

 

 

 

 

 

 

 

Figures

Figure 1.1- 1.2

Key Construction Areas in this Reporting Period

Figure 2.1

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

Figure 3.1

Figure 6.1

Figure 6.2

Figure 6.3

Figure 6.4


Figure 6.5

 

Figure 7.1

Locations of Water Quality Monitoring Stations 

Vessel based Dolphin Monitoring Transects in Baseline Monitoring

Land based Dolphin Monitoring in Baseline and Construction Phases

Sightings Distribution of Chinese White Dolphins

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

Location for Autonomous Passive Acoustic Monitoring in Baseline and Construction Phases

Duration of the SkyPier HSFs travelled through the SCZ for 1 – 30 June 2017

 

Appendices

 

 

 

 

Appendix A

Environmental Mitigation Implementation Schedule (EMIS) for Construction Phase

Appendix B

Monitoring Schedule

Appendix C

Monitoring Results

Appendix D

Calibration Certificates

Appendix E

Status of Environmental Permits and Licences

Appendix F

Cumulative Statistics on Exceedances, Environmental Complaints, Notification of Summons and Status of Prosecutions

Appendix G

Data of SkyPier HSF Movements to/from Zhuhai and Macau (between 1 and 30 June 2017)

 

 

 

 

 

 

 

 

 

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 (the Manual).

This is the 18th Construction Phase Monthly 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 to 30 June 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 sand blanket, site office establishment and horizontal directional drilling (HDD) works.

EM&A Activities Conducted in the Reporting Period

The monthly EM&A programme was undertaken in accordance with the Manual of the Project. During the reporting period, the ET conducted 33 sets of construction dust measurements, 22 sets of construction noise measurements, 12 events of water quality measurements, two complete sets of small vessel line-transect surveys and five days of land-based theodolite tracking survey effort for Chinese White Dolphin (CWD) monitoring and waste monitoring. 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.

Weekly site inspections of the construction works were carried out by the ET to audit the implementation of proper environmental pollution control and mitigation measures for the Project. Bi-weekly site inspections were also conducted by the Independent Environmental Checker (IEC).  Observations have been recorded in the site inspection checklists and provided to the contractors together with the appropriate follow-up actions where necessary.

On the implementation of Marine Mammal Watching Plan (MMWP), silt curtains were in place by the contractors for laying of sand blanket and dolphin observers were deployed in accordance with the plan. On the implementation of Dolphin Exclusion Zone (DEZ) Plan, dolphin observers at 10 to 13 dolphin observation stations were deployed for continuous monitoring of the DEZ by all contractors for DCM works in accordance with the DEZ Plan. Trainings for the proposed dolphin observers were provided by the ET prior to the aforementioned works, with the training records kept by the ET.  From the contractors’ MMWP observation records and DEZ monitoring records, no dolphin or other marine mammals were observed within or around the silt curtains or the DEZs in this reporting month. Audits of acoustic decoupling for construction vessels were also carried out by the ET. 

On the implementation of the Marine Travel Routes and Management Plan for High Speed Ferries of SkyPier (the SkyPier Plan), the daily movements of all SkyPier high speed ferries (HSFs) in June 2017 were in the range of 56 to 95 daily movements, which are within the maximum daily cap of 125 daily movements. A total of 834 HSF movements under the SkyPier Plan were recorded in the reporting period. All HSFs had travelled through the Speed Control Zone (SCZ) with average speeds under 15 knots (9.9 to 14.0 knots), which were in compliance with the SkyPier Plan. One ferry movement with minor deviation from the diverted route is under investigation by ET. The investigation result will be presented in the next monthly EM&A report. In summary, the ET and IEC have audited the HSF movements against the SkyPier Plan and conducted follow up investigation or actions accordingly. Three meetings were held with Ferry Operator representatives in June 2017 to review and discuss the deviation cases as well as to share experience and recommendations to further strengthen the implementation of SkyPier Plan.

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 the deviation case such as speeding, entering no entry zone, not traveling through the designated gate. ET conducted checking to ensure the MSS records all deviation cases accurately. Training has been provided for the concerned skippers to facilitate them in familiarising with the requirements of the MTRMP-CAV. ET reminded contractors that all vessels shall avoid entering the no-entry zone, in particular the Brothers Marine Park. 3-month rolling programmes for construction vessel activities were also received from contractors.

Results of Impact Monitoring

The monitoring works for construction dust, construction noise, water quality, construction waste and CWD were conducted during the reporting period in accordance with the Manual.

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

The water quality monitoring results for total alkalinity and SS 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, chromium, and nickel, some of the testing results exceeded the relevant Action or Limit Levels, and the corresponding investigations were conducted accordingly. The investigation findings concluded that the exceedances were not due to the Project.

Summary of Upcoming Key Issues

Key activities anticipated in the next reporting period for the Project will include the following:

Advanced Works:

Contract P560 (R) Aviation Fuel Pipeline Diversion Works

    HDD works; and

    Stockpiling of excavated materials from HDD operation.

DCM Works:

Contract 3201 to 3205 DCM Works

    Laying of geotextile and sand blanket; and

    DCM works and trials.

Reclamation Works:

Contract 3206 Main Reclamation Works

    Site office establishment; and

    Laying of sand blanket.

 

The key environmental issues will be associated with construction dust, construction noise, water quality, construction waste management and CWD. The implementation of required mitigation measures by the contractor will be monitored by the ET.

Dolphin Observer Training

Dolphin Exclusion Zone Monitoring by Dolphin Observer

Chemical Spill Drill conducted by the Contractor

 

Summary Table

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

 

Yes

No

Details

Analysis / Recommendation / Remedial Actions

Exceedance of Limit Level^

 

ü

No exceedance of project-related limit level was recorded.

Nil

Exceedance of Action Level^

 

ü

No exceedance of project-related action level was recorded.

Nil

Complaints Received

 

ü

No construction activities related complaints were received.

The investigation detail of the complaint received on 22 May 2017 is presented in S7.8.1.

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 were no changes to the construction works that may affect the EM&A

Nil

Remarks:   ^Only exceedance of action/ limit level related to Project works will be highlighted. 

 

1        Introduction

1.1         Background

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

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

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

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

The updated overall phasing programme of all construction works was presented in Appendix A of the Construction Phase Monthly EM&A Report No. 7 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 18th Construction Phase Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 to 30 June 2017.

1.3         Project Organisation

The Project’s organization structure presented in Appendix B of the Construction Phase Monthly EM&A Report No.1 remained unchanged during the reporting month. Contact details of the key personnel have been updated and is presented 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

Joanne Tsoi

3922 9423

Advanced Works:

 

 

 

Contract P560(R) Aviation Fuel Pipeline Diversion Works

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

Project Manager

 

Wei Shih

 

2117 0566

 

Environmental Officer

Lyn Lau

 

5172 6543

 

DCM Works:

 

 

 

Contract 3201 DCM (Package 1)

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

Project Director

 

Tsugunari Suzuki

 

9178 9689

 

Environmental Officer

 

Sze Ming Chan

 

9384 5494

Contract 3202 DCM (Package 2)

(Samsung-BuildKing Joint Venture)

Project Manager

Ilkwon Nam

 

9643 3117

 

Environmental Officer

 

Dickson Mak

 

9525 8408

Contract 3203 DCM  (Package 3)

(Sambo E&C Co., Ltd)

Project Manager

 

Seong Jae Park

 

9683 8693

 

Environmental Officer

 

Calvin Leung

 

9203 5820

Contract 3204 DCM  (Package 4)

(CRBC-SAMBO Joint Venture)

Project Manager

Kyung-Sik Yoo

 

9683 8697

 

 

Environmental Officer

Kanny Cho

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         Summary of Construction Works

The key activities of the Project carried out in the reporting period included DCM works and trials, laying of sand blanket, site office establishment and HDD works.

1.5         Summary of EM&A Programme Requirements

The status for all environmental aspects is presented Table 1.2. The EM&A requirements remained unchanged during the reporting period and details can be referred to Table 1.2 of the Construction Phase Monthly EM&A Report No. 1.

Table 1.2: Summary of status for all environmental aspects under the Updated EM&A Manual        

Parameters

Status

Air Quality

 

Baseline Monitoring

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

Impact Monitoring

On-going

Noise

 

Baseline Monitoring

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

Impact Monitoring

On-going

Water Quality

 

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

On-going

Initial Intensive Deep Cement Mixing (DCM) Water Quality Monitoring

Completed in May 2017 and data analysis in-progress.

Early/ Regular DCM Water Quality Monitoring

On-going

Waste Management

 

Waste Monitoring

On-going

Land Contamination

 

Supplementary Contamination Assessment Plan (CAP)

To be submitted with the relevant construction works.

Contamination Assessment Report (CAR) for Golf Course

The CAR for Golf Course was submitted to EPD.

Terrestrial Ecology

 

Pre-construction Egretry Survey Plan

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

Ecological Monitoring

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

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

Coral Translocation

The coral translocation was completed.

Post-Translocation Coral Monitoring

On-going

Chinese White Dolphins (CWD)

Vessel Survey, Land-based Theodolite Tracking and Passive Acoustic Monitoring (PAM)

Baseline Monitoring

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

Impact Monitoring

On-going

Landscape & Visual

 

Baseline Monitoring

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

Impact Monitoring

On-going

Environmental Auditing

 

Regular site inspection

On-going

Marine Mammal Watching Plan (MMWP) implementation measures

On-going

Dolphin Exclusion Zone Plan (DEZP) implementation measures

On-going

SkyPier High Speed Ferries (HSF) implementation measures

On-going

Construction and Associated Vessels Implementation measures

On-going

Complaint Hotline and Email channel

On-going

Environmental Log Book

On-going

Taking into account the construction works in this reporting month, impact monitoring of air quality, noise, water quality, waste management and CWD were carried out in the reporting month.

The EM&A programme also involved weekly site inspections and related auditing conducted by the ET for checking the implementation of the 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 A.

 

2        Air Quality Monitoring

2.1         Monitoring Stations

Air quality monitoring was conducted at two representative monitoring stations in the vicinity of air sensitive receivers in Tung Chung and villages in North Lantau in accordance with the Manual. Table 2.1 describes the details of the monitoring stations. Figure 2.1 shows the locations of the monitoring stations.

Table 2.1:  Locations of Impact Air Quality Monitoring Stations

Monitoring Station

Location

AR1A

Man Tung Road Park

AR2

Village House at Tin Sum

2.2         Monitoring Requirements and Schedule

In accordance with the Manual, baseline 1-hour total suspended particulate (TSP) levels at the two air quality monitoring stations were established as presented in the Baseline Monitoring Report. Impact 1-hour TSP monitoring was conducted for three times every 6 days. 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 provided in Table 2.2.  

The air quality monitoring schedule involved in the reporting period is provided in Appendix B.

Table 2.2:  Action and Limit Levels for 1-hour TSP

Monitoring Station

Action Level (mg/m3)

Limit Level (mg/m3)

AR1A

306

500

AR2

298

2.3         Monitoring Equipment

Portable direct reading dust meter was used to carry out the 1-hour TSP monitoring. Details of equipment are given in Table 2.3.

Table 2.3:  Air Quality Monitoring Equipment

Equipment

Brand and Model                  

Last Calibration Date                  

Portable direct reading dust meter (Laser dust monitor)

SIBATA LD-3B-002

(Serial No. 974350)

26 Oct 2016

2.4         Monitoring Methodology

2.4.1      Measuring Procedure

The measurement procedures involved in the impact 1-hr TSP monitoring can be summarised as follows: 

a.   The portable direct reading dust meter was mounted on a tripod at a height of 1.2 m above the ground.

b.   Prior to the measurement, the equipment was set up for 1 minute span check and 6 second background check.

c.   The one hour dust measurement was started. Site conditions and dust sources at the nearby area were recorded on a record sheet.

d.   When the measurement completed, the “Count” reading per hour was recorded for result calculation.

2.4.2      Maintenance and Calibration

The portable direct reading dust meter is calibrated every year against high volume sampler (HVS) to check the validity and accuracy of the results measured by direct reading method. The calibration certificates of the portable direct reading dust meter and calibration record of the HVS provided in Appendix B of the Construction Phase Monthly EM&A Report No.11 are still valid. Any updates of calibration certificates will be reported in the Monthly EM&A report if necessary.

2.5         Analysis and Interpretation of Monitoring Results

The monitoring results for 1-hour TSP are summarized in Table 2.4. Detailed impact monitoring results are presented in Appendix C.

Table 2.4: Summary of 1-hour TSP Monitoring Results

Monitoring Station

1-hr TSP Concentration Range (mg/m3)

Action Level (mg/m3)

Limit Level (mg/m3)

AR1A

0.3 – 48

306

500

AR2

5 – 26

298

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

General meteorological conditions throughout the impact monitoring period were recorded. Wind data including wind speed and wind direction for each monitoring day were collected from the Chek Lap Kok Wind Station.

 

3        Noise Monitoring

3.1         Monitoring Stations

Noise monitoring was conducted at five representative monitoring stations in the vicinity of noise sensitive receivers in Tung Chung and villages in North Lantau in accordance with the Manual. Figure 2.1 shows the locations of the monitoring stations and these are described in Table 3.1 below. As described in Section 4.3.3 of the Manual, monitoring at NM2 will commence when the future residential buildings in Tung Chung West Development become occupied.

Table 3.1: Locations of Impact Noise Monitoring Stations

Monitoring Station

Location

Type of measurement

NM1A

Man Tung Road Park

Free field

NM2(1)

Tung Chung West Development

To be determined

NM3A

Site Office

Facade  

NM4

Ching Chung Hau Po Woon Primary School

Free field

NM5

Village House in Tin Sum

Free field

NM6

House No. 1, Sha Lo Wan

Free field

Note: (1) As described in Section 4.3.3 of the Manual, noise monitoring at NM2 will only commence after occupation of the future Tung Chung West Development.

3.2         Monitoring Requirements and Schedule

In accordance with the Manual, baseline noise levels at the noise monitoring stations were established as presented in the Baseline Monitoring Report. Impact noise monitoring was conducted once per week in the form of 30-minute measurements of Leq, L10 and L90 levels recorded at each monitoring station between 0700 and 1900 on normal weekdays. 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 3.2. The construction noise monitoring schedule involved in the reporting period is provided in Appendix B.

Table 3.2: Action and Limit Levels for Construction Noise

Monitoring Stations

Time Period

Action Level

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

NM1A, NM2, NM3A, NM4, NM5 and NM6

0700-1900 hours on normal weekdays

When one documented

complaint is received from

any one of the sensitive

receivers

75 dB(A)(i)

Note: (i) Reduced to 70dB(A) for school and 65dB(A) during school examination periods. School examination took place from 5 to 9 June 2017 in the reporting period.

3.3         Monitoring Equipment

Noise monitoring was performed using sound level meter at each designated monitoring station.  The sound level meters deployed comply with the International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1) specifications.  Acoustic calibrator was used to check the sound level meters by a known sound pressure level for field measurement.  Details of equipment are given in Table 3.3.

Table 3.3: Noise Monitoring Equipment

Equipment

Brand and Model

Last Calibration Date

Integrated Sound Level Meter

B&K 2238 (Serial No. 2800932)

19 Jul 2016

B&K 2238 (Serial No. 2381580)

8 Sep 2016

 

Acoustic Calibrator

B&K 4231 (Serial No. 3003246)

16 May 2017

B&K 4231 (Serial No. 3004068)

19 Jul 2016

3.4         Monitoring Methodology

3.4.1      Monitoring Procedure

The monitoring procedures involved in the noise impact monitoring can be summarised as follows: 

a.   The sound level meter was set on a tripod at least a height of 1.2 m above the ground for free-field measurements at monitoring stations NM1A, NM4, NM5 and NM6. A correction of +3 dB(A) was applied to the free field measurements.

b.   Façade measurements were made at the monitoring station NM3A.

c.   Parameters such as frequency weighting, time weighting and measurement time were set.

d.   Prior to and after each noise measurement, the meter was calibrated using the acoustic calibrator.  If the difference in the calibration level before and after measurement was more than 1 dB(A), the measurement would be considered invalid and repeat of noise measurement would be required after re-calibration or repair of the equipment.

e.   During the monitoring period, Leq, L10 and L90 were recorded.  In addition, site conditions and noise sources were recorded on a record sheet.

f.    Noise measurement results were corrected with reference to the baseline monitoring levels.

g.   Observations were recorded when high intrusive noise (e.g. dog barking, helicopter noise) was observed during the monitoring.

3.4.2      Maintenance and Calibration

The maintenance and calibration procedures are summarised below:

a.   The microphone head of the sound level meter was cleaned with soft cloth at regular intervals.

b.   The meter and calibrator were sent to the supplier or laboratory accredited under Hong Kong Laboratory Accreditation Scheme (HOKLAS) to check and calibrate at yearly intervals.

Calibration certificates of the sound level meters and acoustic calibrators used in the noise monitoring provided in Appendix B of the Construction Phase Monthly EM&A Report No.8 & 9, and Appendix D of the Construction Phase Monthly EM&A Report No. 17 are still valid.

3.5         Analysis and Interpretation of Monitoring Results

The construction noise monitoring results are summarized in Table 3.4 and the detailed monitoring data are provided in Appendix C.

Table 3.4: Summary of Construction Noise Monitoring Results

Monitoring Station

Noise Level Range, dB(A)

Leq (30 mins)

Limit Level, dB(A)

Leq (30 mins)

NM1A(i)

70 – 72

75

NM3A

57 – 61

75

NM4(i)

64 – 65

70(ii)

NM5(i)

56 – 67

75

NM6(i)

62 – 70

75

Note:      (i) +3 dB(A) Façade correction included;

               (ii) Reduced to 65 dB(A) during school examination periods at NM4. School examination took place from 5 to 9 June 2017 in the reporting period.

As the construction activities were far away from the monitoring stations, major sources of noise dominating the monitoring stations observed during the construction noise impact monitoring were road traffic and helicopter noise at NM1A, helicopter and marine vessel noise at NM3A, noise from school bell and helicopter noise at NM4, cicadas, aircraft, and helicopter noise at NM5, and insect, aircraft, helicopter, and marine vessel noise at NM6 in this reporting month. 

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

 

4        Water Quality Monitoring

4.1         Monitoring Stations

Water quality monitoring was conducted at a total of 22 water quality monitoring stations, comprising 12 impact stations, seven sensitive receiver stations and three control stations in the vicinity of water quality sensitive receivers around the airport island in accordance with the Manual. Table 4.1 describes the details of the monitoring stations. Figure 3.1 shows the locations of the monitoring stations. 

Table 4.1: Monitoring Locations and Parameters for Impact Water Quality Monitoring

 

Monitoring Stations

Description

Coordinates

Parameters

Easting

Northing

C1

Control

804247

815620

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

C2

Control

806945

825682

C3(3)

Control

817803

822109

IM1

Impact

806458

818351

IM2

Impact

806193

818852

IM3

Impact

806019

819411

IM4

Impact

805039

819570

IM5

Impact

804924

820564

IM6

Impact

805828

821060

IM7

Impact

806835

821349

IM8

Impact

807838

821695

IM9

Impact

808811

822094

IM10

Impact

809838

822240

IM11

Impact

810545

821501

IM12

Impact

811519

821162

SR1(1)

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

812586

820069

DO, pH, Temperature, Salinity, Turbidity, SS

 

SR2(3)

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

814166

821463

SR3

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

807571

822147

SR4A

Sha Lo Wan

807810

817189

SR5A

San Tau Beach SSSI

810696

816593

SR6

Tai Ho Bay, Near Tai Ho Stream SSSI

814663

817899

SR7

Ma Wan Fish Culture Zone (FCZ)

823742

823636

SR8

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

811593

820417

Notes:   

(1) The seawater intakes of SR1 for the future HKBCF is 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 is commissioned.

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

(3) According to the Baseline Water Quality Monitoring Report, C3 station is not adequately representative as a control  station of impact/ SR stations during the flood tide. The control reference has been changed from C3 to SR2 from 1 September 2016  onwards.

4.2         Monitoring Requirements and Schedule

In accordance with the Manual, baseline water quality levels at the abovementioned representative water quality monitoring stations were established as presented in the Baseline Water Quality Monitoring Report.

General water quality monitoring and early regular DCM water quality monitoring were conducted three days per week, at mid-flood and mid-ebb tides, at the 22 water quality monitoring stations during the reporting period. The sea conditions varied from calm to rough, and the weather conditions varied from sunny to rainy during the monitoring period.

The water quality monitoring schedule for the reporting period is provided in Appendix B. The monitoring session on 13 June 2017 was cancelled due to adverse weather.

4.2.1      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 4.2. The control and impact stations during flood tide and ebb tide for general water quality monitoring and regular DCM monitoring are presented in Table 4.3.

Table 4.2: 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 4.3: 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.

4.3         Monitoring Equipment

Table 4.4 summarises the equipment used for monitoring of specific water quality parameters under the impact water quality monitoring programme.

Table 4.4: Water Quality Monitoring Equipment

Equipment

Brand and Model

Last Calibration Date

Multifunctional Meter (measurement of DO, pH, temperature, salinity and turbidity)

YSI ProDSS (serial no. 15M101244)

16 Jun 2017

YSI ProDSS (serial no. 16J101716)

16 Jun 2017

YSI 6920 V2 (serial no. 00019CB2)

16 Jun 2017

YSI 6920 V2 (serial no. 000109DF)

16 Jun 2017

Digital Titrator (measurement of total alkalinity)

Titrette Digital Burette 50ml Class A

(serial no.10N65665)

19 Jun 2017

Other equipment used as part of the impact water quality monitoring programme are listed in Table 4.5.

Table 4.5: Other Monitoring Equipment

Equipment

Brand and Model

Water Sampler

Van Dorn Water Sampler

Positioning Device (measurement of GPS)

Garmin eTrex Vista HCx

Current Meter (measurement of current speed and direction, and water depth)

Sontek HydroSurveyor

4.4         Monitoring Methodology

4.4.1      Measuring Procedure

Water quality monitoring samples were taken at three depths (at 1m below surface, at mid-depth, and at 1m above bottom) for locations with water depth >6m. For locations with water depth between 3m and 6m, water samples were taken at two depths (surface and bottom). For locations with water depth <3m, only the mid-depth was taken. Duplicate water samples were taken and analysed.

The water samples for all monitoring parameters were collected, stored, preserved and analysed according to the Standard Methods, APHA 22nd ed. and/or other methods as agreed by the EPD. In-situ measurements at monitoring locations including temperature, pH, DO, turbidity, salinity and water depth were collected by equipment listed in Table 4.4 and Table 4.5. Water samples for heavy metals and SS analysis were stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4 ºC without being frozen), delivered to the laboratory within 24 hours of collection.

4.4.2      Maintenance and Calibration

Calibration of In-situ Instruments

All in-situ monitoring instrument were checked, calibrated and certified by a laboratory accredited under HOKLAS before use. Responses of sensors and electrodes were checked with certified standard solutions before each use.

Wet bulb calibration for a DO meter was carried out before commencement of monitoring and after completion of all measurements each day. Calibration was not conducted at each monitoring location as daily calibration is adequate for the type of DO meter employed. A zero check in distilled water was performed with the turbidity probe at least once per monitoring day. The probe was then calibrated with a solution of known NTU. In addition, the turbidity probe was calibrated at least twice per month to establish the relationship between turbidity readings (in NTU) and levels of suspended solids (in mg/L).  Accuracy check of the digital titrator was performed at least once per monitoring day.

The calibration certificates of the monitoring equipment used in the reporting month is updated and provided in Appendix D.

4.4.3      Laboratory Measurement / Analysis

Analysis of SS and heavy metals have been carried out by a HOKLAS accredited laboratory, ALS Technichem (HK) Pty Ltd (Reg. No. HOKLAS 066). Sufficient water samples were collected at all the monitoring stations for carrying out the laboratory SS and heavy metals determination. The SS and heavy metals determination works were started within 24 hours after collection of the water samples. The analysis of SS and heavy metals have followed the standard methods summarised in Table 4.6. The QA/QC procedures for laboratory measurement/ analysis of SS and heavy metals were presented in Appendix F of the Construction Phase Monthly EM&A Report No.8.

Table 4.6: Laboratory Measurement/ Analysis of SS and Heavy Metals

Parameters

Instrumentation

Analytical Method

Reporting Limit

Suspended Solid (SS)

Analytical Balance

APHA 2540D

2 mg/L

Heavy Metals

 

 

 

Chromium (Cr)

ICP-MS

USEPA 6020A

0.2 µg/L

Nickel (Ni)

ICP-MS

USEPA 6020A

0.2 µg/L

4.5         Analysis and Interpretation of Monitoring Results

4.5.1      Summary of Monitoring Results 

The water quality monitoring results for total alkalinity and SS obtained during the reporting period were not triggering 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, chromium, and nickel, some of the testing results exceeded the relevant Action or Limit Levels, and the corresponding investigations were conducted accordingly. Details of the exceedances are presented in Section 4.5.2.

4.5.2      Summary of Findings for Investigation of Exceedances

During the reporting period, water quality monitoring was conducted at 12 impact (IM) stations, seven sensitive receiver (SR) stations, and three control stations in accordance with the Manual. The purpose of water quality monitoring at the IM stations is to promptly capture any potential water quality impact from the Project before it could become apparent at sensitive receivers (represented by the SR stations).

During the monitoring period, testing results exceeding the corresponding Action or Limit Levels were recorded on four monitoring days. Details of the exceedance cases are presented below.

Findings for DO Exceedances (Mid-Ebb Tide)

Table 4.7 presents a summary of the DO (Surface and Middle) compliance status at IM and SR stations during mid-ebb tide for the reporting month.

Table 4.7: 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

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

3

1

1

1

1

2

2

1

1

0

2

1

0

3

2

0

0

3

Note: 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

Table 4.8 presents a summary of the DO (Bottom) compliance status at IM and SR stations during mid-ebb tide for the reporting month.

Table 4.8: 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

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

1

2

0

1

1

0

1

0

2

0

1

0

1

1

0

0

1

Note: 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

Exceedances of Action or Limit Levels were recorded on three monitoring days (two for DO (Bottom)). Repeat in-situ measurements were conducted from 21 to 25 June 2017 as stipulated in the Manual. As exceedances occurred at stations located downstream of the Project, which might be affected by the Project’s construction activities, exceedance investigation was carried out.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on these monitoring days were collected, as well as any observations during the monitoring. The findings are summarised in Table 4.9.

Table 4.9: Summary of Findings from Investigations of DO Exceedances

Date

Marine construction works nearby

Approximate distance from marine construction works*

Status of water quality measures (if applicable)

Construction vessels in the vicinity

Turbidity / Silt plume observed near the monitoring station

Exceedance due to Project

20/06/2017

DCM works

Sand blanket laying

Around 500m

Silt curtain deployed

No

No

No

22/06/2017

DCM works

Sand blanket laying

Around 500m

Silt curtain deployed

No

No

No

24/06/2017

DCM works

Sand blanket laying

Around 500m

Silt curtain deployed

No

No

No

According to the investigation findings, it was confirmed that both DCM and sand blanket laying activities were operating normally with silt curtains deployed as additional measures. The silt curtains were maintained properly.

The monitoring results, as well as results from repeat measurement, 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 large 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.

As shown on the graphs (see Appendix C), there was a gradual decline in DO levels across almost all monitoring stations from 15 June 2017, reaching their lowest levels on 20 June 2017 before gradually increasing from 22 June 2017 onwards. This DO pattern appears to be an aftermath of a severe weather condition in Hong Kong (Severe Tropical Storm Merbok) which occurred between 12 and 13 June 2017 and was followed by a period of continuous rainfall between 13 and 21 June 2017. This meteorological event may have contributed to the widespread DO decline observed in the north Lantau waters.

For SR stations, SR3 was located upstream of the Project boundary, hence would unlikely be affected by the Project’s activities. Separately, SR4A and SR7 were recorded with Action or Limit Level exceedances on several days. Considering that SR4A and SR7 are located farther away from all other SR stations, such as SR2, which did not record similar exceedances, it was unlikely that the DO levels at SR4A and SR7 were due to the Project.

Findings for DO Exceedances (Mid-Flood Tide)

Table 4.10 presents a summary of the DO (Surface and Middle) compliance status at IM and SR stations during mid-flood tide for the reporting month. No exceedances were recorded for DO (Bottom).

Table 4.10: 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

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

1

0

0

0

1

2

3

2

1

2

1

0

3

0

0

0

3

Note: 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

Exceedances of Action and Limit Levels were recorded on three monitoring days. Repeat in-situ measurements were conducted from 21 to 25 June 2017 as stipulated in the Manual. As exceedances occurred at stations located downstream of the Project, which might be affected by the Project’s construction activities, exceedance investigation was carried out.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on these monitoring days were collected, as well as any observations during monitoring. The findings are summarised in Table 4.9.

According to the investigation findings, it was confirmed that both DCM and sand blanket laying activities were operating normally with silt curtains deployed as additional measures. The silt curtains were maintained properly.

Similar to the findings for ebb tide, the monitoring results showed that DO (Surface and Middle) 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 large 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.

The graphs in Appendix C also show the same gradual decline in DO levels across almost all monitoring stations from 15 June 2017, reaching their lowest levels on 20 June 2017 before gradually increasing from 22 June 2017 onwards. It thus appears that the same phenomenon affecting ebb tide DO levels was also affecting flood tide DO levels to a similar degree.

The main SR stations affected during flood tide are SR3 and SR7. SR7 was located upstream of the Project boundary, which would unlikely be affected by the Project’s activities. For SR3, the similarities with ebb tide results suggests the same cause affected SR3 during both tides.

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

Findings for Turbidity Exceedance (Mid-Ebb Tide)

Table 4.11 presents a summary of the turbidity compliance status at IM and SR stations during mid-ebb tide for the reporting month.

Table 4.11: 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

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

Note: 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

An exceedance of Action Level was recorded on one monitoring day. However, the 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 Chromium Exceedance (Mid-Ebb Tide)

Table 4.12 presents a summary of the chromium compliance status at IM stations during mid-ebb tide for the reporting month.

Table 4.12: Summary of Chromium Compliance Status (Mid-Ebb Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

1

0

0

0

0

0

Note: 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

An exceedance of Limit Level was recorded on one monitoring day. However, the 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 Nickel Exceedances (Mid-Flood Tide)

Table 4.13 presents a summary of the nickel compliance status at IM stations during mid-flood tide for the reporting month.

Table 4.13: Summary of Nickel Compliance Status (Mid-Flood Tide)

IM1

IM2

IM3

IM4

IM5

IM6

IM7

IM8

IM9

IM10

IM11

IM12

01/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

04/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

06/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

08/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

10/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

15/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

17/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

20/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

22/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

24/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

27/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

29/06/2017

 

 

 

 

 

 

 

 

 

 

 

 

No. of Exceedance

0

0

0

0

0

0

1

1

1

1

1

1

Note: 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

Exceedances of Action and Limit Levels were recorded on two monitoring days. As exceedances occurred at stations located downstream of the Project which might be affected by the Project’s activities, exceedance investigation was carried out.

As part of the investigation on downstream exceedance events, details of the Project’s marine construction activities on these monitoring days were collected, as well as any observations during monitoring. The findings are summarised in Table 4.9.

According to the investigation findings, it was confirmed that DCM activities were operating normally with silt curtains deployed as additional measures. The silt curtains were maintained properly.

Nickel is a representative heavy metal that indicates the potential for release of contaminants from Contaminated Mud Pits (CMPs) due to the disturbance of marine sediment within CMP by DCM activities. Therefore, elevated nickel concentrations due to these activities should be associated with similar elevated SS levels. For the exceedances at IM8 to IM12 on 20 June 2017, it is noted that no SS exceedance was recorded in the same tide and the concentration (9 – 12 mg/L) was well below the Action and Limit Levels. The low SS levels at impact stations indicates that the active DCM works had limited or insignificant effect on downstream water quality. In addition, the occurrence of exceedances at upstream stations (IM11 and IM12) at the same time as the downstream stations indicates that the nickel source may originate from areas outside of the project boundary. Based on these findings, and given that DCM activities were confirmed to be operating normally with silt curtains deployed and properly maintained, the exceedances were considered not due to the Project and may be due to natural fluctuation or other sources not related to the Project.

For the exceedance at IM7 on 24 June 2017, the exceedance 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 stations, including IM8, which was similarly close to active DCM works during the same tide. Based on these findings, the exceedance was considered not due to the Project.

Conclusions

Based on the findings of the exceedance investigations, it is concluded that the exceedances were not due to the Project. Hence no SR was adversely affected by the Project. All required actions under the Event and Action Plan were followed. Exceedances appeared to be 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 were attended to as a precautionary measure. As part of the EM&A programme, the construction methods and mitigation measures for water quality will continue to be monitored and opportunities for further enhancement will continue to be explored and implemented where possible, to strive for better protection of water quality and the marine environment. 

In the meantime, the contractors were reminded to implement and maintain all mitigation measures during weekly site inspection and regular environmental management meetings. These include maintaining mitigation measures for DCM works and sand blanket laying works properly as recommended in the Manual.

 

5        Waste Management

5.1         Monitoring Requirements

In accordance with the Manual, the waste generated from construction activities was audited once per week to determine if wastes are 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 5.1.

Table 5.1: 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

5.2         Waste Management Status

Weekly monitoring on all works contracts were carried out by the ET to check and monitor the implementation of proper waste management practices during the construction phase.

Recommendations including provision and maintenance of spill kits and drip trays, as well as provision of proper storage area for general refuse, chemical and chemical waste. The contractors had taken actions to implement the recommended measures.

Based on the Contractor’s information, about 576m3 of excavated materials were produced from the HDD launching site under P560(R) in 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 month. Around 127 tonnes of general refuse was disposed of to the WENT Landfill and 1600 litres of chemical waste was collected by licensed chemical waste collector in June 2017. Around 132m3 of Construction and Demolition (C&D) material generated from the DCM contract for site office establishment was sent to public fill.

No exceedances of the Action or Limit Levels were recorded in the reporting period.

 

6        Chinese White Dolphin Monitoring

6.1         CWD Monitoring Requirements

In accordance with the Manual, Chinese White Dolphin (CWD) monitoring by small vessel line-transect survey supplemented by land-based theodolite tracking and passive acoustic monitoring should be conducted during construction phase.

T