TABLE OF CONTENTS

 

EXECUTIVE SUMMARY.. 1

Introduction. 1

Environmental Monitoring Works. 1

Key Information in the Reporting Month. 4

Key Construction Work in the reporting month & the next reporting month. 4

Future Key Issues. 7

1.     introduction.. 9

Purpose of the Report 9

Structure of the Report 9

2.     PROJECT INFORMATION.. 11

Background. 11

Project Organizations. 11

Construction Activities undertaken during the Reporting Month. 12

Status of Environmental Licences, Notification and Permits. 14

Summary of EM&A Requirements. 14

3.     AIR QUALITY.. 17

Monitoring Requirements. 17

Monitoring Locations. 17

Monitoring Equipment 17

Monitoring Parameters and Frequency. 18

Monitoring Methodology. 18

Results and Observations. 21

4.     NOISE.. 22

Monitoring Requirements. 22

Monitoring Locations. 22

Monitoring Equipment 22

Monitoring Methodology and QA/QC Procedure. 23

Results and Observations. 24

5.     WATER QUALITY.. 27

Monitoring Requirements. 27

Monitoring Locations. 27

Monitoring Equipment 28

Monitoring Parameters and Frequency. 30

Monitoring Methodology. 31

Laboratory Analytical Methods. 31

QA/QC Requirements. 32

Decontamination Procedures. 32

Sampling Management and Supervision. 32

Results and Observations. 32

6.     ECOLOGY.. 36

Post-Translocation Coral Monitoring. 36


 

7.     cultural heritage.. 37

Monitoring Requirement 37

Monitoring Locations. 37

Monitoring Equipment 37

Monitoring Methodology. 38

Alert, Alarm and Action Levels. 38

Results. 38

Mitigation Measures for Cultural Heritage. 38

8.     LANDSCAPE AND VISUAL IMPACT REQUIREMENTS. 39

9.     LANDFILL GAS MONITORING.. 40

Monitoring Requirement 40

Monitoring Parameters and Frequency. 40

Monitoring Locations. 40

Monitoring Equipment 40

Results and Observations. 41

10.   ENVIRONMENTAL AUDIT.. 42

Site Audits. 42

Implementation Status of Environmental Mitigation Measures. 42

11.   WASTE MANAGEMENT.. 43

12.   ENVIRONMENTAL NON-CONFORMANCE.. 44

Summary of Exceedances. 44

Summary of Environmental Non-Compliance. 44

Summary of Environmental Complaint 44

Summary of Environmental Summon and Successful Prosecution. 44

13.   FUTURE KEY ISSUES. 45

Key Issues for the Coming Month. 46

14.   CONCLUSIONS AND RECOMMENDATIONS. 48

Conclusions. 48

Recommendations. 49

 


lIST OF TABLES

 

Table I             Non-compliance (exceedance) Recorded for the Project in the Reporting Month

Table II           Key Information in the Reporting Month

Table III          Summary Table for Complaint Details in the Reporting Month

Table IV          Summary Table for Key Construction Work in the Reporting Month

Table V           Summary Table for Site Activities in the next Reporting Period

Table 2.1         Key Project Contacts

Table 2.2         Summary Table for Major Site Activities in the Reporting Month

Table 2.3         Construction Programme Showing the Inter-Relationship with Environmental Protection/Mitigation Measures

Table 2.4          Summary of the Status of Environmental Licences, Notification and Permits

Table 3.1         Locations for Air Quality Monitoring

Table 3.2         Air Quality Monitoring Equipment

Table 3.3         Impact Dust Monitoring Parameters, Frequency and Duration

Table 3.4         Major Dust Source during Air Quality Monitoring

Table 4.1         Noise Monitoring Stations

Table 4.2         Noise Monitoring Equipment

Table 4.3         Noise Monitoring Parameters, Frequency and Duration

Table 4.4         Major Noise Source during Noise Monitoring

Table 4.5         Baseline Noise Level and Noise Limit Level for Monitoring Stations

Table 4.6         Baseline Noise Level and Noise Limit Level for Monitoring Stations (Evening-time & Daytime (Holiday))

Table 4.7         Baseline Noise Level and Noise Limit Level for Monitoring Stations (Night-time)

Table 5.1         Not Used

Table 5.2         Marine Water Quality Monitoring Stations

Table 5.3         Water Quality Monitoring Equipment

Table 5.4         Water Quality Monitoring Parameters and Frequency

Table 5.5         Methods for Laboratory Analysis for Water Samples

Table 5.6         Not Used

Table 7.1         Cultural Heritage Monitoring Equipment

Table 7.2         AAA Levels for Monitoring for Cultural Heritage

Table 9.1         Landfill Gas Monitoring Equipment

Table 13.1       Summary Table for Site Activities in the next Reporting Period

 


lIST OF FIGUREs

 

Figure 1           Site Layout Plan

Figure 1a         Site Portions under Works Contract No. NE/2015/01 (Lam Tin Side)

Figure 1b         Site Portions under Works Contract No. NE/2015/01 (Tseung Kwan O Side)

Figure 1c         Site Portions under Works Contract No. NE/2015/02

Figure 1d         Site Portions under Works Contract No. NE/2015/03

Figure 1e         Site Portions under Works Contract No. NE/2017/01

Figure 1f         Site Portions under Works Contract No. NE/2017/01

Figure 1g         Site Portions under Works Contract No. NE/2017/02

Figure 1h         Site Portions under Works Contract No. NE/2017/02

Figure 2           Locations of Air Quality Monitoring Stations

Figure 3           Locations of Construction Noise Monitoring Stations

Figure 4           Not Used

Figure 5           Locations of Marine Water Quality Monitoring Stations

Figure 6           Locations of Landfill Gas Monitoring

Figure 7           Location of Post-translocation Coral Monitoring

Figure 8           Location of Monitoring for Cultural Heritage

Figure 9           Not Used

 

 

 

lIST OF APPENDIces

 

Appendix A        Action and Limit Levels

Appendix B        Copies of Calibration Certificates

Appendix C        Weather Information

Appendix D        Environmental Monitoring Schedules

Appendix E         1-hour TSP Monitoring Results and Graphical Presentations

Appendix F         24-hour TSP Monitoring Results and Graphical Presentations

Appendix G        Noise Monitoring Results and Graphical Presentations

Appendix H       Not Used

Appendix I          Marine Water Quality Monitoring Results and Graphical Presentations

Appendix J           Not Used

Appendix K        Summary of Exceedance

Appendix L         Site Audit Summary

Appendix M       Event and Action Plans

Appendix N       Implementation Schedule And Recommended Mitigation Measures

Appendix O       Summaries of Environmental Complaint, Warning, Summon and Notification of Successful Prosecution

Appendix P         Waste Generation in the Reporting Month

Appendix Q       Tentative Construction Programme

Appendix R        Record of Landfill Gas Monitoring by Contractor

Appendix S         Updated Noise Mitigation Plan (C2)

Appendix T         Cultural Heritage Monitoring Results

Appendix U       Piezometer Monitoring Results

Appendix V       Surface Management Plan

 

 


EXECUTIVE SUMMARY

Introduction

1.      This is the 46th Environmental Monitoring and Audit (EM&A) Report prepared by Cinotech Consultants Limited for the Agreement No. CE 59/2015 (EP) Environmental Team for Tseung Kwan O Lam Tin Tunnel Design and Construction (hereinafter called the Project).  This report documents the findings of EM&A Works conducted in August 2020.

 

2.      During the reporting month, the following works contracts were undertaken:

Contract No. NE/2015/01 Tseung Kwan O Lam Tin Tunnel Main Tunnel and Associated Works;

Contract No. NE/2015/02 Tseung Kwan O Lam Tin Tunnel Road P2 and Associated Works;

 Contract No. NE/2015/03 Tseung Kwan O Lam Tin Tunnel Northern Footbridge;

 Contract No. NE/2017/01 Tseung Kwan O Lam Tin Tunnel Tseung Kwan O Interchange and Associated Works

 Contract No. NE/2017/02 Tseung Kwan O Lam Tin Tunnel Road P2/D4 and Associated Works.

Contract No. NE/2017/06 Tseung Kwan O Lam Tin Tunnel Traffic Control and Surveillance System(TCSS) and Associated Works

Contract No. NE/2017/07 Cross Bay Link, Tseung Kwan O Main Bridge and Associated Works.

Environmental Monitoring Works

Environmental monitoring for the Project was performed in accordance with the EM&A Manual and the monitoring results were checked and reviewed. Site Inspections/Audits were conducted once per week. The implementation of the environmental mitigation measures, Event Action Plans and environmental complaint handling procedures were also checked.

 

3.      Summary of the non-compliance (exceedance) in the reporting month for the Project is tabulated in Table I.

 


 

Table I       Non-compliance (exceedance) Record for the Project in the Reporting Month

Environmental Monitoring

No. of Non-compliance (Exceedance)

No. of Non-compliance (Exceedance)

due to Construction Activities of this Project

Action Taken

Action Level

Limit Level

Action Level

Limit Level

Air Quality

0

0

0

0

N/A

Noise

4

0

4

0

Refer to Appendix K & O

Marine Water Quality

39

108

0

0

Refer to Appendix K

Groundwater Level Monitoring (Piezometer Monitoring)

0

N/A1

0

N/A1

N/A

Ecological

N/A

N/A

N/A

N/A

N/A

Cultural Heritage

0

0

0

0

N/A

Landfill Gas

0

0

0

0

N/A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:(1) No Limit Level for Groundwater Level Monitoring (Piezometer Monitoring).

 

Air Quality Monitoring

 

4.      No Action/Limit Level exceedance for 1-hour TSP monitoring was recorded.

 

5.      No Action/Limit Level exceedance for 24-hour TSP monitoring was recorded.

 

Construction Noise Monitoring

 

6.      Four (4) Action Level exceedances were recorded due to the documented complaints received in this reporting month. The Summary of Documented Complaints in Reporting Month is tabulated in Table III.

 

7.      No Limit Level exceedance for day time and no limit level exceedance for night time construction noise monitoring were recorded in the reporting month.

 

Water Quality Monitoring

 

Groundwater quality monitoring had been suspended since October 2019 upon the agreement by EPD. Further details should be founded at Section 5.1.

 

All marine water quality monitoring was conducted as scheduled in the reporting month. There were thirty-nine (39) Action Level and one hundred and eight (108) Limit Level exceedances in Monitoring Stations (M) during marine water quality monitoring. During this reporting month, no sand plume was observed during the water quality monitoring and site audits, therefore there is no direct evidence that the recent exceedances were due to the construction works of the Project. Details of this investigation are presented in Section 5. Daily silt curtain inspection and weekly diving inspection have been carried out by contractor, the record, as reviewed by the site auditors, indicated that silt curtains were found in good conditions.

 

8.      Construction phase daily piezometer monitoring by the Contractor commenced in June 2018. It has switched to monthly basis since 3 October 2018 as the construction activity was 120m away from the piezometer gate. No monitoring was conducted in the reporting month.

 

Ecological Monitoring

 

9.      Post-translation coral monitoring survey shall be conducted once every 3 months for a period of 12 months after completion of coral translocation. The post-translocation coral monitoring surveys were completed in November 2017.

 

Monitoring on Cultural Heritage

 

10.  Monitoring of impacts on Cultural Heritage at Cha Kwo Ling Tin Hau Temple commenced in May 2017. No Alert, Alarm and Action (AAA) Level exceedance was recorded in the reporting month.

 

Landscape and Visual Monitoring and Audit

 

11.  The implementation of landscape and visual mitigation measures was checked during the environmental site inspections. Recommended follow-up actions have been discharged by the Contractor.  Details of the audit findings and implementation status are presented in Section 10.

 

Landfill Gas Monitoring

 

12.  Monitoring of landfill gases commenced in December 2016 and were carried out by the Contractor at excavation location, Portion III. No Limit Level exceedance was recorded.

 

Environmental Site Inspection

 

13.  Joint weekly site inspections were conducted by representatives of the Contractor, Engineer and Environmental Team. The representative of the IEC joined the site inspection for NE/2015/01, NE/2015/02, NE/2017/01 and NE/2017/02 on 26, 20, 20 and 20 August 2020 respectively. Details of the audit findings and implementation status are presented in Section 10.

 

Waste Management 

 

14.  Wastes generated from this Project include inert construction and demolition (C&D) materials, non-inert C&D materials and marine sediment. Details of waste management data is presented in Section 11 and Appendix P.


 

Key Information in the Reporting Month

 

15.  Summary of key information in the reporting month is tabulated in Table II

                                                                                                                             

Table II    Key Information in the Reporting Month

Monthly Complaints

Event Details

Action Taken

Status

Number

Nature

August 2020

6

Noise / Operation hours / Water

Details refer to App O

Draft CIRs submitted/ On-going

July 2020

5

Air / Noise

Details refer to App O

Draft CIRs submitted

June 2020

53

Air / Noise / Water/ Odour

Details refer to App O

Draft CIRs submitted

May 2020

53

Air / Noise

Details refer to App O

Draft CIRs submitted/ Closed

April 2020

42

Air / Noise / Light / Odour

Details refer to App O

Draft CIRs submitted/ Closed

March 2020

11

Noise / Odour / Water

Details refer to App O

Closed

February 2020

4

Noise

Details refer to App O

Closed

January 2020

61

Noise

Details refer to App O

Closed

Notifications of any summons & prosecutions received

0

---

N/A

N/A

1. One new complaint was received after the submission of the EMA Report (Jan 2020)

2. One of the complaint in April 2020 was missed out and discovered at mid-May 2020.

3. One complaint was moved from June 2020 to May 2020 after investigation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16.  Summary of complaints received in the reporting month is tabulated in Table III.

 

Table III     Summary of Complaints Details in Reporting Month 

 

Complaint

Investigation Findings

Follow-up Action / Mitigation Measure

Tseung Kwan O Side

Suspected muddy water and worn out silt curtain

The suspected muddy water was due to the strong tidal movement under typhoon influence. The silt curtain was not deployed properly when the typhoon was landed. Details shall be referred to CIR-W15

The contractor is reminded to relocate the barge to shelter once a typhoon is approaching Hong Kong.

Working on restricted hours and public holiday

The working barge was believed to be working under the Cross Bay Link project. None of the barges working on the time of complaint belongs to TKOLTT project. Despite works had been conducted, no PME was turned on during the time of complaint. The details shall be referred to CIR-O4.

The contractor is reminded to strictly follow the CNMP/CNP and no PME is allowed to work on-site during public holidays without legal CNP.

Noise nuisance at morning (Late August 2020)

Under investigation

Long-term noise nuisance since early August

Under investigation

Lam Tin Side

Noise nuisance from tunnel works

Under investigation

Noise nuisance near East Habour Cross Tunnel

Under investigation

Key Construction Work in the reporting month & the next reporting month

17.  Summary of key construction work in the reporting month is tabulated in Table IV.

 

Table IV     Summary Table for Key Construction Work in the Reporting Month

Contract No.

Project Title

Site Activities (August 2020)

NE/2015/01

Tseung Kwan O Lam Tin Tunnel Main Tunnel and Associated Works

Lam Tin Interchange

1)    EHC2 U-Trough

2)    Site Formation Area 1G1, Area 1G2, Area 2 & Area 5

3)    Site Formation Slope stabilization & Retaining Wall

4)    Administration Building & Bridge Construction

5)    Stormwater Tank Construction

6)    S01_2, EHC1&4 Construction

7)    CKLR Underground Utilities

Main Tunnel

8)    S02_2 Excavation

9)    Main Tunnel Lining Works

TKO Interchange

10)Bridge Construction

11)  East Ventilation Building

NE/2015/02

Tseung Kwan O Lam Tin Tunnel Road P2 and Associated Works

1)          Site formation works, road and drainage for Road P2 CH500-CH650 and SR1

2)          Sloping seawall construction

3)          Excavation at CH821 CH105 Cofferdam

4)          Excavation at CH105 CH318 Cofferdam

5)          Installation of dewatering system at CH821 CH105 Cofferdam

6)          Re-construction of Tong Yin Street DN150, DN200

7)          Structure works at underpass CH165 CH318

8)          Reinstatement of Tong Yin Street

9)          Reinstatement of Chiu Shin Street

10)      Water works DN2501 and DN300

11)      Removal of temporary cofferdam

12)      Backfilling the directional sign footing DS25

13)      Installation of socketed H-pile at CT01 CH117 CH336

14)      Construction of abutment

15)      Construction of barrier at CH500 CH650

16)      Drainage works at SR1 footpath / cycle truck

17)      Installation of ELS at cofferdam CH105 CH318

18)      Excavation of 3rd layer of ELS at CH105 CH318 cofferdam

19)      Backfilling works for reinstatement of Tong Yin Street

20)      Construction of storm water drain system for SHH 9101 9103

NE/2015/03

Tseung Kwan O Lam Tin Tunnel Northern Footbridge

The construction works under the contract had been completed in December 2019. The EM&A works were terminated in late April 2020.

NE/2017/01

Tseung Kwan O Lam Tin Tunnel Tseung Kwan O Interchange and Associated Works

1)      Construction of Pier

2)      Construction of Pier Head Works

3)      Construction of Pier Head

4)      Bored Piling Works

5)      Segment Erection Works

6)      Installation of Precast Pile Cap Shell

NE/2017/02

Tseung Kwan O Lam Tin Tunnel Road P2/D4 and Associated Works

1)      Inspection pit excavation and utility diversion works

2)      Construction of drainage and watermain

3)      Pile cap

4)      Asphalt Paving

5)      Pier, Staircase and Lift Shalt Construction

6)      Road Works

7)      Pre-bored Socket-H Pile

NE/2017/06

Tseung Kwan O Lam Tin Tunnel Traffic Control and Surveillance System(TCSS) and Associated Works

Nil


 

Future Key Issues

18.  The future key environmental issues in the coming month include:

 

Table V    Summary Table for Site Activities in the next Reporting Period

Contract No. and Project Title

Site Activities (September 2020)

Key Environmental Issues *

NE/2015/01 - Tseung Kwan O Lam Tin Tunnel Main Tunnel and Associated Works

Lam Tin Interchange

1)   EHC2 U-Trough

2)   Site Formation Area 1G1, Area 1G2, Area 2 & Area 5

3)   Site Formation Slope stabilization & Retaining Wall

4)   Administration Building & Bridge Construction

5)   Stormwater Tank Construction

6)   S01_2, EHC1&4 Construction

7)   CKLR Underground Utilities

(A) / (B) / (C) / (D) / (E) / (G)

Main Tunnel

8)   S02_2 Excavation

9)   Main Tunnel Lining Works

(B)

TKO Interchange

10)             Bridge Construction

11)             East Ventilation Building

(A) / (C) / (D) / (E) / (F) / (I)

NE/2015/02 - Tseung Kwan O Lam Tin Tunnel Road P2 and Associated Works

1)         Construction of pillar box and ducting system at Portion IV adjacent to Ocean Shores EVA

2)         Construction of utility trough and road barriers at road P2 CH411 500 and SR2 CH110 CH170 (land section)

3)         Site formation at Road P2 CH500-CH650 and SR1

4)         Road and drainage works at Road P2 CH500 650, slip road SR1 footpath and cycle track, slip road SR2 CH250 CH350

5)         R.C. structure works for U-trough CH318-CH363

6)         ELS at underpass P2 CH105 CH318

7)         Modification of dewatering system (P2 CH105 CH318)

8)         3rd of excavation at CH105 CH318 cofferdam

9)         Installation of de-watering system at S200 CH821 CH105

10)     Installation of socketed H-pile at CT01 CH117 CH336

11)     Construction of abutment

12)     Reposition of Tong Yin Street

13)     Drainage works from SMH9101 SMH9103

14)     Installation of de-watering system at CH821 CH105

15)     Excavation & ELS installation works at CH821 CH105

16)     Construction of sloping seawall

17)     Removal of temporary cofferdam

18)     Construction of seawall coping

19)     Installation of profile barrier at P2 CH500-CH650

20)     Construction of barrier at CH500 CH650

21)     Drainage works at SR1 footpath / cycle truck

22)     Installation of ELS at cofferdam CH105 CH318

23)     Excavation of 3rd layer of ELS at CH105 CH318 cofferdam

24)     Backfilling works for reinstatement of Tong Yin Street

25)     Construction of storm water drain system for SHH 9101 9103

26)     Construction of U-trough at CH821 CH 165 Cofferdam

27)     ELS at CH8214 CH105 Cofferdam

 

(A) / (B) / (C) / (D) / (E) / (G) / (I)

NE/2015/03 - Tseung Kwan O Lam Tin Tunnel Northern Footbridge

 

The construction works under the contract had been completed in December 2019. Materials are being removed from works area.

N/A

NE/2017/01 Tseung Kwan O Interchange and Associated Works

1)      Dismantling of Temporary Working Platforms

2)      Bored Piling Works

3)      Installation of Precast Pile Cap Shell

4)      Construction of Pile Cap

5)      Construction of Pier

6)      Construction of Pier Head works

7)      Segment erection works

8)      Construction of Bridge Decks

(A) / (B) / (E) / (F) / (G)

NE/2017/02 Tseung Kwan O - Lam Tin Tunnel - Road P2/D4 and Associated Works

1)      Inspection pit excavation and utility diversion works

2)      Construction of drainage and watermain

3)      Pile cap

4)      Pre-bored Socket-H Pile

5)      Asphalt Paving

6)      Pier, Staircase and Lift Shalt Construction

7)      Road Works

(A) / (B) / (E) / (F) / (G)

NE/2017/06 Tseung Kwan O Lam Tin Tunnel Traffic Control and Surveillance System(TCSS) and Associated Works

Nil

N/A

Note:

(A)        Watering for dust generation from haul road, stockpiles of dusty materials, exposed site area, excavation works and rock breaking activities;

(B)         Noisy construction activity such as rock-breaking activities and piling works;

(C)         Runoff from exposed slope or site area;

(D)        Wastewater and runoff discharge from site;

(E)         Accumulation of silt, mud and sand along U-channels and sedimentation tanks;

(F)         Set up and implementation of temporary drainage system for the surface runoff;

(G)        Storage of chemicals/fuel and chemical waste/waste oil on site;

(H)        Accumulation and storage of general and construction waste on site; and

(I)          Marine water quality impact and indirect impact to coral communities due to marine construction for TKO-LTT reclamation


1.              introduction

 

1.1              Cinotech Consultants Limited (Cinotech) was commissioned by Civil Engineering and Development Department (CEDD) as the Environmental Team (ET) to undertake environmental monitoring and auditing services for the Works Contracts involved in the implementation of Tseung Kwan O Lam Tin Tunnel (TKO-LTT) project to ensure that the environmental performance of the Works Contracts comply with the requirements specified in the Environmental Permit (EP), Environmental Monitoring & Audit (EM&A) Manual, Environmental Impact Assessment (EIA) Report of the TKO-LTT project and other relevant statutory requirements.  This is the 46th Monthly EM&A report summarizing the EM&A works for the Project in August 2020.

Purpose of the Report

1.2              This is the 46th Monthly EM&A Report which summarises the impact monitoring results and audit findings for the EM&A programme during the reporting period in August 2020.

Structure of the Report

1.3              The structure of the report is as follows:

 

Section 1:  Introduction purpose and structure of the report.

 

Section 2: Contract Information summarises background and scope of the Contract, site description, project organization and contact details, construction programme, the construction works undertaken and the status of Environmental Permits/Licenses during the reporting month.

 

Section 3: Air Quality Monitoring summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations, Action and Limit Levels, monitoring results and Event / Action Plans.

 

Section 4: Noise Monitoring summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations, Action and Limit Levels, monitoring results and Event / Action Plans.

 

Section 5: Water Quality Monitoring summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations, Action and Limit Levels, monitoring results and Event / Action Plans.

 

Section 6: Ecological Monitoring summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations and Action and Limit Levels, monitoring results and Event / Action Plans.

 

Section 7: Cultural Heritage summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations and monitoring results.

 

Section 8: Landscape and Visual Monitoring Requirements summarises the requirements of landscape and visual monitoring

 

Section 9: Landfill Gas Monitoring summarises the monitoring parameters, monitoring programmes, monitoring methodologies, monitoring frequency, monitoring locations, monitoring results and Limit Levels and Action Plan

 

Section 10: Environmental Site Inspection summarises the audit findings of the weekly site inspections undertaken within the reporting month.

 

Section 11: Waste Management summarises the waste management data in the reporting month.

 

Section 12: Environmental Non-conformance summarises any monitoring exceedance, environmental complaints, environmental summons and successful prosecutions within the reporting month.

 

Section 13: Future Key Issues summarises the impact forecast and monitoring schedule for the next three months.

 

Section 14: Conclusions and Recommendation

 


2.              PROJECT INFORMATION

Background

 

2.1              In 2002, Civil Engineering and Development Department (CEDD) commissioned an integrated planning and engineering study under Agreement No. CE 87/2001 (CE) Further Development of Tseung Kwan O Feasibility Study (the TKO Study) to formulate a comprehensive plan for further development of TKO New Town.  It recommended to further develop TKO to house a total population of 450,000 besides the districts continuous commercial and industrial developments.

 

2.2              At present, the Tseung Kwan O Tunnel is the main connection between Tseung Kwan O (TKO) and other areas in the territory.  To cope with the anticipated transport need, the TKO Study recommended the provision of Tseung Kwan O Lam Tin Tunnel (TKO-LTT) (hereinafter referred to as the Project) and Cross Bay Link (CBL) to meet the long-term traffic demand between TKO and the external areas. The site layout plan for the Project is shown in Figure 1. CBL was also entrusted with part of the marine viaducts near Tseung Kwan O Interchange since the commencement of the CBL project the December 2018.

 

2.3              The Environmental Impact Assessment (EIA) Report for the TKO-LTT project was approved under the Environmental Impact Assessment Ordinance (EIAO) in July 2013. The corresponding Environmental Permit (EP) was issued in August 2013 (EP no.: EP-458/2013). Variations to the EP was applied and the latest EP (EP no.: EP-458/2013/C) was issued by the Director of Environmental Protection (DEP) in January 2017.

 

2.4              The commencement dates of construction of this Project are:

Ÿ   Contract No. NE/2015/01 and Contract No. NE/2015/02: 7 November 2016.

Ÿ   Contract No. NE/2015/03: 29 May 2017.

Ÿ   Contract No. NE/2017/02: 15 March 2018.

Ÿ   Contract No. NE/2017/01: 23 May 2018.

Ÿ   Contract No. NE/2017/06: 09 November 2018.

 

Project Organizations

2.5              Different parties with different levels of involvement in the project organization include:

          Project Proponent Civil Engineering and Development Department (CEDD)

          The Engineer and the Engineers Representative (ER) AECOM

          Environmental Team (ET) Cinotech Consultants Limited (Cinotech)

          Independent Environmental Checker (IEC) AnewR Consulting Limited (AnewR)

 


2.6              The key contacts of the Project are shown in Table 2.1.

Table 2.1      Key Project Contacts

Party

Role

Contact Person

Phone No.

Fax No.

CEDD

Project Proponent

Mr. LO Sai Pak, Sunny

2301 1384

2739 0076

AECOM

Engineers  Representative

Mr. KY Chan

3922 9000

2759 1698

Cinotech

Environmental Team

Dr. HF Chan

2151 2088

3107 1388

Mr. KS Lee

2151 2091

AnewR

Independent Environmental Checker

Mr. Adi Lee

2618 2836

3007 8648

Construction Activities undertaken during the Reporting Month

2.7              The major site activities undertaken in the reporting month included:

 

Table 2.2      Summary Table for Major Site Activities in the Reporting Month

Contract No.

Project Title

Site Activities (August 2020)

NE/2015/01

Tseung Kwan O Lam Tin Tunnel Main Tunnel and Associated Works

Lam Tin Interchange

1)   EHC2 U-Trough

2)   Site Formation Area 1G1, Area 1G2, Area 2 & Area 5

3)   Site Formation Slope stabilization & Retaining Wall

4)   Administration Building & Bridge Construction

5)   Stormwater Tank Construction

6)   S01_2, EHC1&4 Construction

7)   CKLR Underground Utilities

Main Tunnel

8)   S02_2 Excavation

9)   Main Tunnel Lining Works

TKO Interchange

10)Bridge Construction

11)East Ventilation Building

NE/2015/02

Tseung Kwan O Lam Tin Tunnel Road P2 and Associated Works

1)       Site formation works, road and drainage for Road P2 CH500-CH650 and SR1

2)        Sloping seawall construction

3)        Excavation at CH821 CH105 Cofferdam

4)        Excavation at CH105 CH318 Cofferdam

5)        Installation of dewatering system at CH821 CH105 Cofferdam

6)        Re-construction of Tong Yin Street DN150, DN200

7)        Structure works at underpass CH165 CH318

8)        Reinstatement of Tong Yin Street

9)        Reinstatement of Chiu Shin Street

10)    Water works DN2501 and DN300

11)    Removal of temporary cofferdam

12)    Backfilling the directional sign footing DS25

13)    Installation of socketed H-pile at CT01 CH117 CH336

14)    Construction of abutment

15)    Construction of barrier at CH500 CH650

16)    Drainage works at SR1 footpath / cycle truck

17)    Installation of ELS at cofferdam CH105 CH318

18)    Excavation of 3rd layer of ELS at CH105 CH318 cofferdam

19)    Backfilling works for reinstatement of Tong Yin Street

20)    Construction of storm water drain system for SHH 9101 9103

NE/2015/03

Tseung Kwan O Lam Tin Tunnel Northern Footbridge

The construction works under the contract had been completed in December 2019. Materials were being removed from works area.

NE/2017/01

Tseung Kwan O Lam Tin Tunnel Tseung Kwan O Interchange and Associated Works

1)      Construction of Pier

2)      Construction of Pier Head Works

3)      Construction of Pier Head

4)      Bored Piling Works

5)      Segment Erection Works

6)      Installation of Precast Pile Cap Shell

NE/2017/02

Tseung Kwan O Lam Tin Tunnel Road P2/D4 and Associated Works

1)      Inspection pit excavation and utility diversion works

2)      Construction of drainage and watermain

3)      Pile cap

4)      Asphalt Paving

5)      Pier, Staircase and Lift Shalt Construction

6)      Road Works

7)      Pre-bored Socket-H Pile

NE/2017/06

Tseung Kwan O Lam Tin Tunnel Traffic Control and Surveillance System(TCSS) and Associated Works

Nil

 

2.8              The construction programme showing the inter-relationship with environmental protection/mitigation measures are presented in Table 2.3

 

Table 2.3      Construction Programme Showing the Inter-Relationship with Environmental Protection/Mitigation Measures

Construction Works

Major Environmental Impact

Control Measures

As mentioned in Table 2.2

Noise, dust impact, water quality and waste generation

Ÿ   Sufficient watering of the works site with active dust emitting activities

Ÿ   Properly cover the stockpiles

Ÿ   On-site waste sorting and implementation of trip ticket system

Ÿ   Appropriate desilting/sedimentation devices provided on site for treatment before discharge

Ÿ   Use of quiet plant and well-maintained construction plant

Ÿ   Provide movable noise barrier

Status of Environmental Licences, Notification and Permits

2.9              A summary of the relevant permits, licences, and/or notifications on environmental protection for this Project is presented in Table 2.4.

 

Table 2.4         Summary of the Status of Environmental Licences, Notification and Permits

Contract No.

Permit / License No.

Valid Period

Status

From

To

Environmental Permit (EP)

N/A

EP-458/2013/C

20/1/2017

N/A

Valid

Notification pursuant to Air Pollution Control (Construction Dust) Regulation

NE/2015/01

EPD Ref no.: 405305

21/07/2016

N/A

Valid

EPD Ref no.: 405582

28/07/2016

N/A

Valid

NE/2015/02

EPD Ref no.: 406100

12/08/2016

N/A

Valid

NE/2015/03

EPD Ref no.: 416072

26/04/2017

N/A

Valid

NE/2017/02

EPD Ref no.: 429867

19/01/2018

N/A

Valid

NE/2017/01

EPD Ref no.: 430070

25/01/2018

N/A

Valid

Billing Account for Construction Waste Disposal

NE/2015/01

Account No. 7025431

11/07/2016

30/09/2020

Valid

NE/2015/02

Account No. 7025654

16/08/2016

N/A

Valid

NE/2015/03

Account No. 7026805

30/12/2016

N/A

Valid

NE/2017/02

Account No. 7029651

22/12/2017

N/A

Valid

NE/2017/01

Account No. 7029994

01/02/2018

N/A

Valid

NE/2017/06

Account No. 7032520

22/11/2018

N/A

Valid

Registration of Chemical Waste Producer

NE/2015/01

Waste Producer No. 5218-290-L2881-02

22/08/2016

N/A

Valid

Waste Producer No. 5213-833-L2532-03

22/08/2016

N/A

Valid

NE/2015/02

Waste Producer No. 5213-838-C4094-01

23/08/2016

N/A

Valid

NE/2015/03

Waste Producer No. 5213-265-W3435-04

19/07/2017

N/A

Valid

NE/2017/02

Waste Producer No. 5213-833-Z4004-04

01/02/2018

N/A

Valid

NE/2017/01

Waste Producer No. 5213-833-C4262-01

12/02/2018

N/A

Valid

Effluent Discharge License under Water Pollution Control Ordinance

NE/2015/01

WT00025806-2016

18/07/2018

30/11/2021

Valid

WT00026212-2016

16/05/2017

30/11/2021

Valid

WT00027354-2017

22/03/2017

31/03/2022

Valid

WT00027405-2017

22/03/2017

31/03/2022

Valid

WT00028495-2017

11/08/2017

31/08/2022

Valid

NE/2015/02

WT00026386-2016

15/12/2016

31/12/2021

Valid

WT00027226-2017

23/02/2017

28/02/2022

Valid

WT00030654-2018

16/04/2018

30/04/2023

Valid

NE/2015/03

WT00027295-2017

20/03/2017

31/03/2022

Valid

NE/2017/01

WT00030711-2018

11/04/2018

30/04/2023

Valid

WT00030716-2018

23/05/2018

31/05/2023

Valid

NE/2017/02

WT00030654-2018

16/04/2018

30/04/2023

Valid

Construction Noise Permit (CNP)

NE/2015/01

GW-RE0110-20

05/03/2020

04/09/2020

Valid

GW-RE0149-20

23/03/2020

22/09/2020

Valid

GW-RE0323-20

15/05/2020

29/11/2020

Valid

GW-RE0362-20

21/05/2020

12/11/2020

Valid

GW-RE0366-20

21/05/2020

20/11/2020

Valid

GW-RE0486-20

23/06/2020

21/12/2020

Valid

GW-RE0572-20

08/07/2020

07/09/2020

Valid

GW-RE0580-20

08/07/2020

07/10/2020

Valid

GW-RE0662-20

21/08/2020

20/11/2020

Valid

GW-RE0693-20

07/09/2020

06/11/2020

Valid

GW-RE0697-20

04/09/2020

03/03/2021

Valid

NE/2015/02

GW-RE0114-20

06/03/2020

05/09/2020

Valid

GW-RE0181-20

20/03/2020

10/09/2020

Valid

GW-RE0291-20

06/05/2020

15/10/2020

Valid

GW-RE0302-20

07/05/2020

10/10/2020

Valid

GW-RE0429-20

14/06/2020

13/09/2020

Valid

GW-RE0433-20

01/06/2020

25/11/2020

Valid

GW-RE0477-20

11/06/2020

13/09/2020

Valid

GW-RE0503-20

12/06/2020

04/12/2020

Valid

GW-RE0584-20

08/07/2020

07/10/2020

Valid

NE/2017/01

GW-RE0250-20

09/04/2020

30/09/2020

Valid

GW-RE0290-20

04/05/2020

03/11/2020

Valid

GW-RE0331-20

07/05/2020

03/11/2020

Valid

GW-RE0549-20

30/06/2020

28/12/2020

Valid

NE/2017/02

GW-RE0509-20

02/07/2020

30/09/2020

Valid

Marine Dumping Permit

NE/2017/01

EP/MD/21-011

N/A

N/A

N/A

NE/2015/01

CEDD01062

N/A

10/11/2020

Valid

Specified Process (SP) License

NE/2015/01

L-11-053

09/03/2018

08/03/2021

Valid

Summary of EM&A Requirements

2.10          The EM&A programme requires construction noise monitoring, air quality monitoring, water quality monitoring, environmental site audit, etc. The EM&A requirements for each parameter are described in the following sections, including:

 

          All monitoring parameters;

          Action and Limit levels for all environmental parameters;

          Event Action Plans;

          Environmental mitigation measures, as recommended in the Project EIA Report.

 

2.11          The advice on the implementation status of environmental protection and pollution control/mitigation measures is summarized in Section 10 of this report.

 

2.12          This report presents the monitoring results, observations, locations, equipment, period, methodology and QA/QC procedures of the monitoring parameters of the required environmental monitoring works and audit works for the Project in August 2020.


3.              AIR QUALITY

Monitoring Requirements

 

3.1              According to EM&A Manual of the Project, 1-hour and 24-hour TSP monitoring are required to monitor the air quality. For regular impact monitoring, a sampling frequency of at least once in every six days shall be undertaken at all of the monitoring stations for 24-hour TSP monitoring. For 1-hour TSP monitoring, the sampling frequency of at least three times in every six days shall be undertaken when the highest dust impact occurs. Appendix A shows the established Action/Limit Levels for the environmental monitoring works.

Monitoring Locations

 

3.2              Six designated monitoring stations were selected for air quality monitoring programme. Table 3.1 describes the air quality monitoring locations, which are also depicted in Figure 2.

 

Table 3.1     Locations for Air Quality Monitoring

Monitoring Stations

Location

Location of Measurement

AM1

Tin Hau Temple

Ground Level

AM2

Sai Tso Wan Recreation Ground

Ground Level

AM3

Yau Lai Estate Bik Lai House

Rooftop (41/F)

AM4(1)

Sitting-out Area at Cha Kwo Ling Village

Ground Level

AM4(A)(2) (*)

Cha Kwo Ling Public Cargo Working Area Administrative Office

Rooftop (3/F)

AM5(A)(*)

Tseung Kwan O DSD Desilting Compound

Ground Level

AM6(A) (*)

Park Central, L1/F Open Space Area

1/F

Remarks: (1) For 1-hour TSP monitoring; (2) For 24-hour TSP monitoring

(*) Air quality monitoring at designated station AM4(24-hr TSP), AM5 and AM6 was rejected by the premise owners. Therefore, baseline and impact air quality monitoring works were carried out at alternative air quality monitoring stations AM4(A) (24-hr TSP only), AM5(A) and AM6(A) respectively.

Monitoring Equipment

3.3              High Volume Samplers (HVS) were used to carry out 24-hour TSP monitoring. Direct reading dust meter were also used to measure 1-hour average TSP levels. The 1-hour sampling was determined periodically by HVS to check the validity and accuracy of the results measured by direct reading method.

 

3.4              Wind data monitoring equipment was set at rooftop (about 41/F) of Yau Lai Estate Bik Lai House for logging wind speed and wind direction such that the wind sensors are clear of obstructions or turbulence caused by building. The wind data monitoring equipment is re-calibrated at least once every six months and the wind directions are divided into 16 sectors of 22.5 degrees each. The location is shown in Figure 2.

 

3.5              Table 3.2 summarizes the equipment to be used in the air quality monitoring.  Copies of calibration certificates are attached in Appendix B.

 

Table 3.2     Air Quality Monitoring Equipment

Equipment

Model and Make

Quantity

Calibrator

TISCH Model: TE-5025A

1

1-hour TSP Dust Meter

Sibata Model No.: LD-3B / LD-5R

3

Met One Instruments Model No.: AEROCET-831

0

Handheld Particle Counter Hal-HPC300 / Hal-HPC301

0

HVS Sampler

TISCH Model: TE-5170

1

GMW Model: GS2310

5

Wind Anemometer

Davis Weather Monitor II, Model no. 7440

1

Davis Weather Stations, Vantage Pro 2, Model No. 6152CUK

0

Monitoring Parameters and Frequency

3.6              Table 3.3 summarizes the monitoring parameters, monitoring period and frequencies of air quality monitoring.

 

Table 3.3     Frequency and Parameters of Air Quality Monitoring

Monitoring Stations

Parameter

Frequency

AM1, AM2, AM3, AM4, AM5(A) and AM6(A)

1-hour TSP

3 times per 6 days

AM1, AM2, AM3, AM4(A), AM5(A) and AM6(A)

24-hour TSP

Once per 6 days

Monitoring Methodology

1-hour TSP Monitoring

Measuring Procedures

3.7              The measuring procedures of the 1-hour dust meter are in accordance with the Manufacturers Instruction Manual as follows:

(Model LD3 / LD3B / LD5R)

Ÿ The 1-hour dust meter is placed at least 1.3 meters above ground.

Ÿ Set POWER to ON and make sure that the battery level was not flash or in low level.

Ÿ Allow the instrument to stand for about 3 minutes and then the cap of the air sampling inlet has been released.

Ÿ Push the knob at MEASURE position.

Ÿ Set time/mode setting to [BG] by pushing the time setting switch.  Then, start the background measurement by pushing the start/stop switch once.  It will take 6 sec. to complete the background measurement.

Ÿ Push the time setting switch to change the time setting display to [MANUAL] at the bottom left of the liquid crystal display.  Finally, push the start/stop switch to stop the measuring after 1 hour sampling.

Ÿ Information such as sampling date, time, count value and site condition were recorded during the monitoring period.


(AEROCET-531)

Ÿ The 1-hour dust meter is placed at least 1.3 meters above ground.

Ÿ Remove the red rubber cap from the AEROCET-531 inlet nozzle.

Ÿ Turn on the power switch that is located on the right side of the AEROCET-531.

Ÿ On power up the product intro screen is displayed for 3 seconds. The intro screen displays the product name and firmware version.

Ÿ Then the main counter screen will be displayed.

Ÿ Press the START button. Internal vacuum pump start running. After 1 minute the pump will stop and the 0.5痠 and 5痠 channels will show the cumulative counts of particles larger than 0.5痠 and 5痠 per cubic foot.

Ÿ The AEROCET-531 is now checked out and ready for use.

Ÿ To switch off the AEROCET-531 power to stop the measuring after 1 hour sampling.

Ÿ Information such as sampling date, time, and display value and site condition were recorded during the monitoring period.

 

(Equipment: Hal Technology; Model no. Hal-HPC300 / Hal-HPC301)

Ÿ The 1-hour dust meter is placed at least 1.3 meters above ground.

Ÿ Set POWER to ON and make sure that the battery level was not flash or in low level.

Ÿ Allow the instrument to stand for about 3 minutes and then the cap of the air sampling inlet has been released.

Ÿ Push the knob at MEASURE position.

Ÿ Set time/mode setting to [BG] by pushing the time setting switch.  Then, start the background measurement by pushing the start/stop switch once.  It will take 6 sec. to complete the background measurement.

Ÿ Push the time setting switch to change the time setting display to [MANUAL] at the bottom left of the liquid crystal display.  Finally, push the start/stop switch to stop the measuring after 1 hour sampling.

Ÿ Information such as sampling date, time, count value and site condition were recorded during the monitoring period.

Maintenance/Calibration

3.8              The following maintenance/calibration is required for the direct dust meters:

Ÿ Check and calibrate the meter by HVS to check the validity and accuracy of the results measured by direct reading method at 2-month intervals throughout all stages of the air quality monitoring.

 

24-hour TSP Monitoring

Instrumentation

 

3.9              High volume samplers (HVS) (TISCH Model: TE-5170 and GMW Model: GS2310) completed with appropriate sampling inlets were employed for 24-hour TSP monitoring.  The sampler is composed of a motor, a filter holder, a flow controller and a sampling inlet and its performance specification complied with that required by USEPA Standard Title 40, Code of Federation Regulations Chapter 1 (Part 50).

 

3.10          The positioning of the HVS samplers are as follows:

  a horizontal platform with appropriate support to secure the samplers against gusty wind shall be provided;

  no two samplers shall be placed less than 2 meter apart

  the distance between the sampler and an obstacle, such as buildings, must be at least twice the height that the obstacle protrudes above the sampler;

  a minimum of 2 metres of separation from walls, parapets and penthouses is required for rooftop samplers;

  a minimum of 2 metres of separation from any supporting structure, measured horizontally is required;

  no furnace or incinerator flue is nearby;

  airflow around the sampler is unrestricted;

  the sampler is more than 20 metres from the dripline;

  any wire fence and gate, to protect the sampler, shall not cause any obstruction during monitoring;

  permission must be obtained to set up the samplers and to obtain access to the monitoring stations; and

  a secured supply of electricity is needed to operate the samplers.

Operating/analytical procedures for the operation of HVS

3.11          Prior to the commencement of the dust sampling, the flow rate of the high volume sampler was properly set (between 1.1 m3/min. and 1.4 m3/min.) in accordance with the manufacturer's instruction to within the range recommended in USEPA Standard Title 40, CFR Part 50.

 

3.12          For TSP sampling, fiberglass filters with a collection efficiency of > 99% for particles of 0.3μm diameter were used.

 

3.13          The power supply was checked to ensure the sampler worked properly.  On sampling, the sampler was operated for 5 minutes to establish thermal equilibrium before placing any filter media at the designated air monitoring station.

 

3.14          The filter holding frame was then removed by loosening the four nuts and a weighted and conditioned filter was carefully centred with the stamped number upwards, on a supporting screen.

 

3.15          The filter was aligned on the screen so that the gasket formed an airtight seal on the outer edges of the filter.  Then the filter holding frame was tightened to the filter holder with swing bolts. The applied pressure should be sufficient to avoid air leakage at the edges.

 

3.16          The shelter lid was closed and secured with the aluminium strip.

 

3.17          The timer was then programmed.  Information was recorded on the record sheet, which included the starting time, the weather condition and the filter number (the initial weight of the filter paper can be found out by using the filter number).

 

3.18          After sampling, the filter was removed and sent to the HOKLAS laboratory (Wellab Ltd.) for weighing.  The elapsed time will be also recorded.

 

3.19          Before weighing, all filters was equilibrated in a conditioning environment for 24 hours. The conditioning environment temperature should be between 25蚓 and 30蚓 and not vary by more than 3蚓; the relative humidity (RH) should be < 50% and not vary by more than 5%. A convenient working RH is 40%.

Maintenance/Calibration

3.20          The following maintenance/calibration is required for the HVS:

Ÿ  The high volume motors and their accessories will be properly maintained. Appropriate maintenance such as routine motor brushes replacement and electrical wiring checking will be made to ensure that the equipment and necessary power supply are in good working condition.

Ÿ  High volume samplers will be calibrated at bi-monthly intervals using TE-5025A Calibration Kit throughout all stages of the air quality monitoring.

Results and Observations

3.21          No Action/Limit Level exceedance was recorded for both 1-hour TSP and 24-hour TSP monitoring respectively.

 

3.22          The air temperature, precipitation and the relative humidity data was obtained from Hong Kong Observatory where the wind speed and wind direction were recorded by the installed Wind Anemometer at rooftop of Yau Lai Estate Bik Lai House (41/F). The location is shown in Figure 2. This weather information for the reporting month is summarized in Appendix C.

 

3.23          The monitoring data and graphical presentations of 1-hour and 24-hour TSP monitoring results are shown in Appendix E and Appendix F respectively.

 

 

3.24          According to our field observations, the major dust source identified at the designated air quality monitoring stations are as follows:

 

Table 3.4                    Major Dust Source during Air Quality Monitoring

 

 Station

Major Dust Source

AM1 Tin Hau Temple

Road Traffic at Cha Kwo Ling Road

AM2 Sai Tso Wan Recreation Ground

N/A

AM3 Yau Lai Estate Bik Lai House

Road Traffic near Eastern Cross Harbour Tunnel Toll Plaza

AM4 - Sitting-out Area at Cha Kwo Ling Village

Road Traffic at Cha Kwo Ling Road

AM4(A) - Cha Kwo Ling Public Cargo Working Area Administrative Office

Road Traffic at Cha Kwo Ling Road

AM5(A) - Tseung Kwan O DSD Desilting Compound

Vehicle Movement within the Desilting Compound

AM6(A) - Park Central, L1/F Open Space Area

Road Traffic at Po Yap Road

 

 
4.
                  NOISE

Monitoring Requirements

 

4.1              According to EM&A Manual of the Project, construction noise monitoring was conducted to monitor the construction noise arising from the construction activities. The regular monitoring frequency for each monitoring station shall be on a weekly basis and conduct one set of measurements between 0700 and 1900 hours on normal weekdays. Appendix A shows the established Action and Limit Levels for the environmental monitoring works.

Monitoring Locations

4.2              Noise monitoring was conducted at 9 designated monitoring stations (CM1, CM2, CM3, CM4, CM5, CM6(A), CM7(A), CM8(A), CM9(A)) in the reporting period. Table 4.1 and Figure 3 show the locations of these stations.

 

Table 4.1     Noise Monitoring Stations

Monitoring Stations

Locations

Location of Measurement

CM1

Nga Lai House, Yau Lai Estate Phase 1, Yau Tong

Rooftop (41/F)

CM2

Bik Lai House, Yau Lai Estate Phase 1, Yau Tong

Rooftop (41/F)

CM3

Block S, Yau Lai Estate Phase 5, Yau Tong

Rooftop (40/F)

CM4

Tin Hau Temple, Cha Kwo Ling

Ground Level

CM5

CCC Kei Faat Primary School, Yau Tong

Rooftop (6/F)

CM6(A)*

Site Boundary of Contract No. NE/2015/02 near Tower 1, Ocean Shores

Ground Level

CM7(A)*

Site Boundary of Contract No. NE/2015/02 near Tower 7, Ocean Shores

Ground Level

CM8(A)*

Park Central, L1/F Open Space Area

1/F

CM9(A)1

Rooftop of Capri Tower 10

Rooftop (12/F)

Remarks:

* Noise monitoring at designated station CM6, CM7 & CM8 was rejected by the premise owners. Therefore, baseline and impact noise monitoring works were carried out at alternative noise monitoring stations CM6(A), CM7(A) and CM8(A) respectively.

1 Ad-hoc noise monitoring at station CM9(A) was commenced in September 2019.

 

4.3              Since the population intake of Capri had commenced during the construction of the TKOLTT, the noise monitoring work in daytime period was conducted at CM9(A) Rooftop of Capri Tower 10 on normal weekdays. The background Noise Level was recorded during the Lunch Hour of Construction Site (i.e. 12:00-13:00) and to be used as the referencing value for compliance checking for Noise Action and Limit Level.

Monitoring Equipment

4.4              Integrating Sound Level Meter was used for impact noise monitoring. The meters are Type 1 sound level meter capable of giving a continuous readout of the noise level readings including equivalent continuous sound pressure level (Leq) and percentile sound pressure level (Lx) that also complied with International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1) specifications. Table 4.2 summarizes the noise monitoring equipment being used. Copies of calibration certificates are attached in Appendix B.

 

Table 4.2     Noise Monitoring Equipment

Equipment

Model and Make

Quantity

Integrating Sound Level Meter

SVAN 957/ 959 / 979

3

BSWA308 SLM

1

Calibrator

SV30A

1

Brel & Kj熳 4231

1

ST-120

2

 

4.5              Table 4.3 summarizes the monitoring parameters, frequency and total duration of monitoring. The noise monitoring schedule is shown in Appendix D. Additional weekly impact monitoring are carried out for evening time (1900 2300 hours) for monitoring stations CM1, CM2, CM3 & CM6(A) and night-time (2300 0700 hours) for monitoring stations CM1, CM2 & CM3.

 

Table 4.3   Frequency and Parameters of Noise Monitoring

Monitoring Stations

Parameter

Period

Frequency

Measurement

CM1

L10(30 min) dB(A)

L90(30 min) dB(A)

Leq(30 min) dB(A)

0700-1900 hrs on normal weekdays

 

Once per week

Fa蓷de

CM2

Fa蓷de

CM3

Fa蓷de

CM4

Fa蓷de

CM5

Fa蓷de

CM6(A)

Free Field

CM7(A)

Free Field

CM8(A)

Fa蓷de

CM9(A)

Fa蓷de

CM1

L10(5 min) dB(A)

L90(5 min) dB(A)

Leq(5 min) dB(A)

1900 0700 hrs on normal weekdays

Fa蓷de

CM2

Fa蓷de

CM3

Fa蓷de

CM6(A)

1900 2300 hrs on normal weekdays

Free Field

Monitoring Methodology and QA/QC Procedure

4.6              The monitoring procedures are as follows:

  The monitoring station was normally be at a point 1m from the exterior of the sensitive receivers building fa蓷de and be at a position 1.2m above the ground. 

  For free field measurement, the meter was positioned away from any nearby reflective surfaces. All records for free field noise levels was adjusted with a correction of +3 dB(A).

  The battery condition was checked to ensure the correct functioning of the meter.

  Parameters such as frequency weighting, the time weighting and the measurement time was set as follows:

- frequency weighting                       : A

- time weighting         : Fast

- measurement time    : 30 minutes

  Prior to and after each noise measurement, the meter was calibrated using a Calibrator for 94.0 dB at 1000 Hz. If the difference in the calibration level before and after measurement will be more than 1.0 dB, the measurement would be considered invalid and repeat of noise measurement would be required after re-calibration or repair of the equipment.

  At the end of the monitoring period, the Leq, L90 and L10 was recorded.  In addition, noise sources was recorded on a standard record sheet.

  Noise monitoring will be cancelled in the presence of fog, rain, and wind with a steady speed exceeding 5 m/s, or wind with gusts exceeding 10 m/s. Supplementary monitoring was provided to ensure sufficient data would be obtained.

 

Maintenance and Calibration

 

4.7              The microphone head of the sound level meter and calibrator was cleaned with a soft cloth at quarterly intervals.

 

4.8              The sound level meter and calibrator was checked and calibrated at yearly intervals.

 

4.9              Immediately prior to and following each noise measurement the accuracy of the sound level meter was checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements may be accepted as valid only if the calibration levels from before and after the noise measurement agree to within 1.0 dB.

Results and Observations

4.10          Four (4) Action Level exceedances were recorded due to the documented complaints received in this reporting month. No Limit level exceedances for night-time construction noise monitoring were recorded and no Limit Level exceedance for day time was recorded in the reporting month.

 

4.11          Noise monitoring results and graphical presentations are shown in Appendix G.

 

4.12          The major noise source identified at the noise monitoring stations are shown in Table 4.4.

 

Table 4.4     Major Noise Source during Noise Monitoring

Monitoring Stations

Locations

Major Noise Source

CM1

Nga Lai House, Yau Lai Estate Phase 1, Yau Tong

Road Traffic near Eastern Cross Harbour Tunnel Toll Plaza

CM2

Bik Lai House, Yau Lai Estate Phase 1, Yau Tong

Road Traffic near Eastern Cross Harbour Tunnel Toll Plaza

CM3

Block S, Yau Lai Estate Phase 5, Yau Tong

Road Traffic near Eastern Cross Harbour Tunnel Toll Plaza

CM4

Tin Hau Temple, Cha Kwo Ling

Road Traffic at Cha Kwo Ling Road

CM5

CCC Kei Faat Primary School, Yau Tong

Road Traffic at Yau Tong Road

CM6(A)

Site Boundary of Contract No. NE/2015/02 near Tower 1, Ocean Shores

Road Traffic at O King Road near Ocean Shores

CM7(A)

Site Boundary of Contract No. NE/2015/02 near Tower 7, Ocean Shores

Road Traffic at Tong Yin Street

CM8(A)

Park Central, L1/F Open Space Area

Road Traffic at Po Yap Road

CM9(A)

Rooftop of Capri Tower 10

Construction Noise from Portion V/Area A of NE/2015/02 site area

 

4.13          All the Construction Noise Levels (CNLs) reported in this report were adjusted with the corresponding baseline level (i.e. Measured Leq Baseline Leq = CNL), in order to facilitate the interpretation of the noise exceedance. The baseline noise level and the Noise Limit Level at each designated noise monitoring station are presented in Table 4.5, 4.6 and 4.7.

Table 4.5        Baseline Noise Level and Noise Limit Level for Monitoring Stations

Station

Baseline Noise Level, dB (A)
(at 0700 1900 hrs on normal weekdays)

Noise Limit Level, dB (A) (at 0700 1900 hrs on normal weekdays)

CM1

65.5

75

CM2

63.6

CM3

65.6

CM4

62.0

CM5

68.2

70*

CM6(A)

61.9

75

CM7(A)

58.3

CM8(A)

69.1

CM9(A)

N/A(1)

(*) Noise Limit Level is 65 dB(A) during school examination periods.

(1) ) The background Noise Level was recorded during the Lunch Hour of Construction Site (i.e. 12:00-13:00) and to be used as the referencing value for compliance checking for Noise Action and Limit Level.

 

Table 4.6        Baseline Noise Level and Noise Limit Level for Monitoring Stations (Evening-time & Daytime (Holiday))

Station

Baseline Noise Level, dB (A)

(Evening time on all days (1900-2300 hrs) and Holidays (including Sundays) during daytime (0700-1900 hrs))

Noise Limit Level, dB (A)

(Evening time on all days (1900-2300 hrs) and Holidays (including Sundays) during daytime (0700-1900 hrs))

CM1

64.4

70

CM2

62.2

CM3

64.7

CM6(A)

60.2

651

1. ASR B was adopted according to the EIA as traffic in the surrounding area has not been changed.

 

 

Table 4.7        Baseline Noise Level and Noise Limit Level for Monitoring Stations (Night-time)

Station

Baseline Noise Level, dB (A)

(Night-time (2300 0700 hrs)

Noise Limit Level, dB (A)

(Night-time (2300 0700 hrs)

CM1

14-day baseline monitoring results for the time period of impact measurement at each station would be adopted

55

CM2

CM3

 

Current Tunnel Blasting Arrangement

 

4.14          The drill and blast method was evaluated as the most appropriate method and the general practice of this method was introduced during the EIA report assessment. The paragraphs 2.9.9 and 2.9.33 of the EIA Report mention that there might be one blast or multiple blasts and the maximum number of blast location per day would be determined by the Contractor to suite his method of working.

 

4.15          Notwithstanding the information provided by the Engineer at paragraphs 4.6.4 and 6.6.12 of the EIA Report, to minimize blast nuisance to the public and to respond to the community concerns, the tunnel blast should be arranged, where possible, avoiding the blast to be carried out during night time and shortening the blast duration by arranging various work fronts to be blasted at different time slots. Hence, it has become more desirable to split one tunnel blasting operation, which may consist of several blasting work fronts along the tunnels, into a total of two to three tunnel blasts per day. The tunnel blasts, which locate outside the MTR Protection Zone (RPZ) possessing insignificant risk to the MTR's structures would be carried out during day time and before 22:00. For the tunnel blasts within and in close vicinity to RPZ, Contractor's blasting assessment report revealed that those blasts have to be carried out after train service and, generally, at around 01:40.

 

 


 


 

5.                  WATER QUALITY

Monitoring Requirements

Groundwater Quality

 

5.1              The existing groundwater quality monitoring programme has been suspended as the monitoring results had been deemed non-representative of the impact from the project justified by two major factors: (1) influence on the monitoring results from non-project related factors, such as anthropogenic activities and natural phenomenon; and (2) large separation between the monitoring stations and works area. In addition, as no alternative locations for the groundwater quality monitoring were available, the groundwater quality monitoring has been suspended since October 2019 upon the agreement by EPD.

 

Marine Water Quality

 

5.2              Marine water quality monitoring was conducted three times per week at the designated monitoring stations. Monitoring took place two times per monitoring day during mid ebb and mid flood tides at three depths (1 meter from surface, mid depth and 1 meter from the bottom). For Tseung Kwan O Salt Water Intake (i.e. Station M6), water sampling and in-situ measurements was taken at the vertical level where the water abstraction point of the intake is located (i.e. approximately mid-depth level). If the water depth is less than 6m, the mid-depth measurement may be omitted. If the depth is less than 3m, only the mid-depth measurements need to be taken.

 

5.3              Duplicate in-situ measurements (Dissolved oxygen (DO) concentration, DO saturation, turbidity, pH, temperature and salinity) and water samples (suspended solids (SS)) at each depth were monitored in accordance with the requirements in the EM&A Manual. For selection of tides for in-situ measurement and water sampling, tidal range of individual flood and ebb tides were not less than 0.5m.

 

5.4              According to the Environmental Review Report (ERR) for Variations of Environmental Permit (Ref: C45-03), water quality monitoring and audit programme was implemented for monitoring of oxygen depletion (e.g. Dissolved Oxygen (DO) level) in this embayed waters during the period when the fully enclosed barrier is installed. A Proposal for Water Quality Monitoring in Temporary Marine Embayment has been submitted to EPD in July 2017 to propose the monitoring frequency, parameter, location, etc. EPD has no further comment on the Proposal. Since January 2020, the cofferdam has been partially removed and the seawater is no longer enclosed. Therefore, no embayment water quality monitoring is required.

 

Groundwater Level Monitoring (Piezometer Monitoring)

 

5.5              Daily piezometer monitoring at any time of the day shall be carried throughout the whole period when any tunnel construction activities are carried out within +/- 50m of the piezometer gate in plan. The monitoring commenced in June 2018. It has switched to monthly basis since 3 October 2018 as the construction activity was 120m away from the piezometer gate. No monitoring was conducted in the reporting month.

Monitoring Locations

Marine Water Quality

5.6              A total of twelve monitoring stations are designated for the water quality monitoring program according to EM&A Manual. One additional monitoring station (W1) is designated for monitoring of oxygen depletion in the embayed waters during the period when the fully enclosed barrier is installed. The locations are also summarized in Table 5.2 and shown on Figure 5.

 

Table 5.2     Marine Quality Monitoring Stations

Monitoring Stations

Descriptions

Coordinates

Easting

Northing

M1

Junk Bay Coral Site Junk Bay near Chiu Keng Wan

844255

817565

M2

Junk Bay Coral Site Junk Bay

844076

817087

M3

Junk Bay Coral Site Junk Island

844491

817890

M4

Junk Bay Coral Site Chiu Keng Wan

843209

816416

M5

Junk Bay Coral Site Fat Tong Chau

845463

815769

M6

Tseung Kwan O Salt Water Intake

845512

817442

C1

Control Station Southeast

844696

814773

C2

Control Station Northwest

842873

816014

G1

Gradient Station

844418

817560

G2

Gradient Station

844290

817384

G3

Gradient Station

844488

817735

G4

Gradient Station

844967

817551

Monitoring Equipment

5.7              For in-situ monitoring, a multi-parameter meter (Aquaread AP-2000-D) was used to measure Dissolved oxygen (DO) concentration, DO saturation (DO %), pH, temperature and turbidity.  A sampler was used to collect water samples for laboratory analysis of SS, BOD5, TOC, Total Nitrogen, Ammonia-N and Total Phosphate.

 

Dissolved Oxygen (DO) and Temperature Measuring Equipment

5.8              The instrument for measuring dissolved oxygen and temperature was portable and weatherproof complete with cable, sensor, comprehensive operation manuals and use DC power source. It was capable of measuring:

 

Ÿ   a dissolved oxygen level in the range of 0-20 mg/L and 0-200% saturation; and

Ÿ   a temperature of 0-45 degree Celsius.

 

5.9              It has a membrane electrode with automatic temperature compensation complete with a cable.

 

5.10          Sufficient stocks of spare electrodes and cables were available for replacement where necessary.

 

5.11          Salinity compensation was built-in in the DO equipment.

 

 

 

Turbidity

5.12          Turbidity was measured in-situ by the nephelometric method. The instrument was portable and weatherproof using a DC power source complete with cable, sensor and comprehensive operation manuals. The equipment was capable of measuring turbidity between 0-1000 NTU. The probe cable was not be less than 25m in length.

 

pH

5.13          The instrument was consisting of a potentiometer, a glass electrode, a reference electrode and a temperature-compensating device. It was readable to 0.1pH in a range of 0 to 14. Standard buffer solutions of at least pH 7 and pH 10 were used for calibration of the instrument before and after use.

 

Water Depth Detector

5.14          A portable, battery-operated echo sounder was used for the determination of water depth at each designated monitoring station.

 

Water Sampler

5.15          Water samples collected for laboratory analysis were stored in high density polythene bottles sample containers, with appropriate preservatives added. All sampling bottles were labelled (waterproof) with the sampling date and time, sample lot number and sampling location reference number to avoid mishandling.

 

Sample Container and Storage

5.16          Following collection, water samples for laboratory analysis were stored in high density polythene bottles, with preservative appropriately added where necessary. They will be packed in ice (cooled to 4C without being frozen), delivered to the laboratory and analysed as soon as possible.

 

Calibration of In-Situ Instruments

5.17          All in-situ monitoring instruments were checked, calibrated and certified by a laboratory accredited under HOKLAS or other international accreditation scheme before use, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the water quality monitoring.

 

5.18          For the on-site calibration of field equipment, the BS 1427:1993, "Guide to Field and on-site test methods for the analysis of waters" was observed.

 

5.19          Before each round of monitoring, a zero check in distilled water was performed with the turbidity probe of Aquaread AP-2000-D. The probe was then be calibrated with a solution of known NTU.

 

5.20          Sufficient stocks of spare parts were maintained for replacements when necessary. Backup monitoring equipment was also made available so that monitoring can proceed uninterrupted even when some equipment is under maintenance, calibration, etc.

5.21          Table 5.3 summarizes the equipment used in the water quality monitoring program. Copies of the calibration certificates of the equipment are shown in Appendix B.

 

 

 

 

Table 5.3     Water Quality Monitoring Equipment

Equipment

Model and Make

Qty.

Water Sampler

Kahlsico Water-Bottle Model 135DW 150

1

Multi-parameter Water Quality System

YSI 6820-C-M

0

Aquaread AP-2000-D

0

YSI EXO1 Multiparameter Sondes

1

Monitoring Position Equipment

Magellan Handheld GPS Model GPS-320

1

Water Depth Detector

Fishfinder 140

1

Monitoring Parameters and Frequency

5.22          Table 5.4 summarizes the monitoring parameters, monitoring period and frequencies of the water quality monitoring in the reporting period.

 

Table 5.4     Water Quality Monitoring Parameters and Frequency

Monitoring Stations

Parameters, unit

Depth

Frequency

Marine Water Quality

M1

M2

M3

M4

M5

M6

C1

C2

G1

G2

G3

G4

In-situ:

Dissolved oxygen (DO) concentration, DO saturation, turbidity, pH, temperature and salinity

 

Laboratory Testing:

Suspended Solids (SS)

M1-M5, C1-C2, G1-G4

      3 water depths: 1m below water surface, mid-depth and 1m above sea bed.

      If the water depth is less than 3m, mid-depth sampling only.

       If the water depth is less than 6m, omit mid-depth sampling.

M6

      at the vertical level where the water abstraction point of the intake is located(i.e. approximately mid-depth level)

3 days per week

 /

2 per monitoring day

(1 for mid-ebb and 1 for mid-flood)

 


 

Monitoring Methodology

 

Marine Water Quality

5.23          The monitoring stations were accessed using survey boat by the guide of a hand-held Global Positioning System (GPS). The depth of the monitoring location was measured using depth meter in order to determine the sampling depths. Afterwards, the probes of the in-situ measurement equipment was lowered to the predetermined depths (1 m below water surface, mid-depth and 1 m above seabed) and the measurements was carried out accordingly. The in-situ measurements at predetermined depths was carried out in duplicate. In case the difference in the duplicate in-situ measurement results was larger than 25%, the third set of in-situ measurement would be carried out for result confirmation purpose.

 

5.24          Water sampler was lowered into the water to the required depths of sampling. Upon reaching the pre-determined depth, a messenger to activate the sampler was then released to travel down the wire. The water sample was sealed within the sampler before retrieving. At each station, water samples for SS at three depths (1 m below water surface, mid-depth and 1 m above seabed) were collected accordingly. Water samples were stored in a cool box and kept at less than 4C but without frozen and sent to the laboratory as soon as possible.

Laboratory Analytical Methods

5.25          The testing of all parameters were conducted by Wellab Ltd. (HOKLAS Registration No.083) and comprehensive quality assurance and control procedures in place in order to ensure quality and consistency in results. The testing method and limit of reporting are provided in Table 5.5.

 

 

 

Table 5.5     Methods for Laboratory Analysis for Water Samples

Parameters (Unit)

Proposed Method

Reporting Limit

Detection Limit

SS (mg/L)

APHA 2540 D

0.5 mg/L (1)

0.5 mg/L

BOD5 (mg O2/L)

APHA 19ed 5210B

2 mg O2/L

--

TOC (mg-TOC/L)

In-house method SOP020 (Wet Oxidation)

1 mg-TOC/L

--

Total Nitrogen
(mg/L)

In-house method SOP063 (FIA)

0.6 mg/L

--

Ammonia-N
(mg NH3-N/L)

In-house method SOP057 (FIA)

0.05 mg NH3-N/L

--

Total Phosphorus
(mg-P/L)(2)

In-house method SOP055 (FIA)

0.05 mg-P/L

--

Note:

1) Limit of Reporting is reported as Detection Limit for non-HOKLAS report.

2) Parameter Total Phosphorus represents the laboratory testing for total phosphate content in water which is the sum of all three forms of phosphates in water.

QA/QC Requirements

Decontamination Procedures

5.26          Water sampling equipment used during the course of the monitoring programme was decontaminated by manual washing and rinsed clean seawater/distilled water after each sampling event. All disposal equipment was discarded after sampling.

Sampling Management and Supervision

5.27          Water samples were dispatched to the testing laboratory for analysis as soon as possible after the sampling. All samples were stored in a cool box and kept at less than 4C but without frozen. All water samples were handled under chain of custody protocols and relinquished to the laboratory representatives at locations specified by the laboratory.

 

5.28          QA/QC procedures as attached in Appendix J are available for the parameters analysed in the HOKLAS-accredited laboratory, WELLAB Ltd.

Results and Observations

Groundwater Quality Monitoring

5.29          Monitoring of groundwater quality had been suspended since October 2019. (Details refer to Section 5.1)

 

Marine Water Quality Monitoring

5.30          Marine water monitoring results and graphical presentations are shown in Appendix I. Other relevant data was also recorded, such as monitoring location / position, time, sampling depth, weather conditions and any special phenomena or work underway nearby.

 

5.31          Calculated Action and Limit Levels for Marine Water Quality is presented in Appendix I. Thirty-nine (39) Action Level and one hundred and eight (108) limit level exceedances on Monitoring Stations (M) were recorded in marine water quality monitoring.

 

5.32          Exceedances of turbidity and suspended solid were recorded on from various monitoring stations non-specifically among all stations including the control stations. Investigations over August 2020 showed that the range of SS levels recorded in August 2020 remained consistent with the records in recent months. All Contractor is reminded to strictly follow the approved drainage plan and clear drainage regularly. In particular, all drainage shall be checked and cleared after heavy rainstorm as sediments may accumulate along pipes and culverts. Further details of the exceedance investigation reports can be found in Appendix K.

 

5.33          Silt curtain inspections are carried out before the commencement of the construction works every day and diving surveys are also conducted once a week to inspect the silt curtain below the water level. The inspection report are verified by both the RE and the diving specialist and the records are reviewed weekly during the site audits.

 


 

 

 

Groundwater Level Monitoring (Piezometer Monitoring)

 

5.34          Daily piezometer monitoring at any time of the day shall be carried throughout the whole period when any tunnel construction activities are carried out within +/- 50m of the piezometer gate in plan.

 

5.35          Tunnel construction activities are within +/- 50m of the piezometer gate in plan. Construction phase daily piezometer monitoring by the Contractor commenced in June 2018. It has switched to monthly basis since 3 October 2018 as the construction activity was 120m away from the piezometer gate. No monitoring was conducted in the reporting month.

Mitigation Measures Adopted by Contractors for Surface runoff Prevention

 

5.36          During dry season, the Contractors have maintained the mitigation measures adopted on Site, in order to prevent surface run-off and muddy water from discharging to the public areas. The mitigation measures adopted by each Contract are summarised below:

 

NE2015/01

5.37          At Lam Tin Side, the Site drainage systems are divided into two parts, namely the site formation and tunnel site drainage which includes:

 

1.      Site formation drainage system collects surface run-off from open excavation areas including slope works and flows naturally to the lowest point in the Site, where they are pumped to the wetseps and sedimentation tank for treatment near LTI site entrance before they are discharged to the designated discharge point.

2.      Tunnel drainage system collects surface run-off from the tunnel which are then pumped to the sedimentation tanks near tunnel adit, where three sets of wetseps and sedimentation tanks were set up. The treated water will be discharged to designated discharge point near the Eastern Harbour Crossing (EHC) area.

 

5.38          At Eastern Harbour Crossing (EHC), two sets of wetseps and sedimentation tanks are set up on site. The wastewater will flow to the lowest catchpit by gravity, which are then pumped to wetseps for wastewater treatment. The sandbags/bunds are also set up at the vehicle entrance to surface run-off from the Site.

 

5.39          At Tseung Kwan O (TKO), the surface run-off from the slope are directed to the lowest point at cavern via the permanent drainage, which are then pumped to the sedimentation tanks for wastewater treatment via temporary pipes. The treated water will be discharged at designated discharge points. The wetseps and sedimentation tanks are provided under the BMCPC bridge and at the two sides of marine working platform. Water from natural stream will also be diverted to existing drainage to avoid overloading the capacity of the wastewater treatment system. The reservoir on the right side of marine working platform will be enlarged to cater for higher water storage demands. During heavy rainfall, the water stored at the exit of the tunnel shall be pumped into the sedimentation tanks on the right.

 

 

NE2015/02

5.40          The exposed sloped area at Portion 9 has been covered with geotextile or tarpaulin to avoid surface run-off. Temporary peripheral open U-channel are also provided along the surcharge area within the rock mount to collect stormwater and surface run-off.

 

5.41          Soak away pit with a 600mm in diameter were bored into the ground, down to -14mPD, near the piling works area to cater for the surface runoff at Portion IX (Figure 1C). The stormwater and the water generated from the piling works are stored temporary at the pit around the soak away pit, which shall be pumped automatically into the soak away pit where they are soaked into the soil naturally.

 

 

5.42          The stormwater received in Portion 9 shall be directed and pumped via the flex tube and sump towards the water treatment system and the approved discharge points. Water generated from Portion VI and V and some water in Portion IX are treated via storage tanks and sedimentation tanks and discharged into approved discharge points (manholes of DN2100 Drain and Area Z).

 

5.43          The peripheral open U-channel are also provided along the site boundary, which shall be directed to the storage tank and WetSep for treatment in Area A.

 

5.44          Regular cleaning depending on site conditions are provided for the WetSep at Area A and Z; and the storage tanks and sedimentation tanks at Area A. The water treated by the sedimentation tank and the wetsep shall be discharged towards the designated discharge point. Quality of the effluent are also monitored regularly.   

 

NE2017/02

5.45          Existing manholes are covered with sandbags and geotextiles to avoid surface run-off from entering the channels.

 

5.46          Stockpiles are covered with tarpaulin to avoid surface run-off.

 

5.47          Concrete blocks and sandbags are placed along the periphery of the site boundary to avoid surface run-off.

 

5.48          Stormwater within the site enters the excavated area and flow naturally into the sump due height difference. The stormwater collected in the sump shall be pumped into the sedimentation tank where the run-off are treated before discharging into the designated discharge point.

 

NE2015/03

5.49          The existing manhole cover are covered with geotextile to prevent muddy water from entering the existing U-channels along the side of Po Shun Road. Manhole inspection are carried out by taking silt measurement regularly in case if silt enters the channel, and silt shall be removed from the manhole if silt were found.

 

5.50          Sandbags were placed at the periphery of the site along the hoarding to prevent surface runoff from escaping the site.

 

5.51          Exposed slopes are covered with tarpaulin to prevent surface run-off.

 

5.52          The surface run-off shall be pumped into the sedimentation tank where they are treated before entering the designated discharge points

NE2017/01

5.53          Temporary peripheral open U-channels and sumps are provided for collecting the stormwater, which are pumped and directed towards the sedimentation tank for treatment. The treated water shall be directed to the designated discharge point.

 

 


 

 

6.              ECOLOGY

Post-Translocation Coral Monitoring

6.1              Post-translocation monitoring survey is recommended in the EM&A Manual to audit the success of coral translocation.  Information gathered during each post-translocation monitoring survey should include observations on the presence, survival, health condition and growth of the translocated coral colonies.  These parameters should then be compared with the baseline results collected from the pre-translocation survey.

 

6.2              Under Contract No. NE/2015/01 and NE/2015/02, a total of 14 and 29 coral colonies were tagged and translocated respectively from the Donor Site to the Recipient Site in November 2016. Ten (10) corals at the Recipient Site were also tagged by each Contract as reference for post-translocation monitoring.

 

6.3              The post-translocation coral monitoring shall be conducted once every 3 months after completion for a period of 12 months. Location of post-translocation coral monitoring is shown in Figure 7. The fourth post-translocation coral monitoring was carried out on 07 November 2017. No further monitoring is required.

 


 

7.              cultural heritage

            Monitoring Requirement

7.1              According to the EP Conditions and EM&A Manual, monitoring of vibration impacts was conducted when the construction works are less than 100m from the Built Heritage in close proximity of the worksite, namely the Cha Kwo Ling Tin Hau temple. Tilting and settlement monitoring should be applied on the Cha Kwo Ling Tin Hau Temple. Construction works less than 100m from the Cha Kwo Ling Tin Hau temple commenced on 8 May 2017.

 

7.2              As stated in the Built Heritage Mitigation Plan for this Project, during the period of the construction works conducted within 100m from the Cha Kwo Ling Tin Hau Temple, monitoring on settlement and tilting will be conducted once a day for the Cha Kwo Ling. Monitoring of vibration will be conducted during blasting at Cha Kwo Ling area once a day.  When there is no blasting to be conducted at the area, vibration monitoring at the Cha Kwo Ling Tin Hau Temple will be conducted once per day when there are piling works or rock breaking works within the 100m from the Cha Kwo Ling Tin Hau Temple.

Monitoring Locations

7.3              One vibration monitoring point and three building settlement monitoring points were proposed for monitoring of the cultural heritage.  The building settlement markers were placed on the wall on three sides of the Temple, except the front, of the Cha Kwo Ling Tin Hau Temple and the vibration monitoring point is located within the Cha Kwo Ling Tin Hau Temple. Monitoring Location is shown in Figure 8.

       Monitoring Equipment

7.4              Building settlement is measured via a settlement marker attached to the wall of Cha Kwo Ling Tin Hau Temple by adhesive tape. 

 

7.5              Vibration monitoring was conducted by using vibrographs: Minimate Plus manufactured by Instantel.  These vibrographs will be calibrated annually and its performance follows the requirements given in the Guidance Note on Vibration Monitoring (GN-VM) issued by the Civil Engineering and Development Department, which is based on the Performance Specification for Blasting Seismographs by International Society of Explosive Engineers (ISEE (2000)).

 

7.6              Table 7.1 summarizes the equipment employed by the Contractor for cultural heritage monitoring. Copies of calibration certificates are attached in Appendix B.

 

Table 7.1      Cultural Heritage Monitoring Equipment

Equipment

Manufacturer and Model

Quantity

Digital Level for tilting

Leica LS15

Serial No.: 701141

1

Digital Caliper for tilting

Mitutoyo CD-6 ASX

Serial No.: A17047921

1

iCivil-1011 Inclinometer

for building settlement

iCivil-1011 Inclinometer

Serial No.: HK110118 / HK110120

2

Vibrographs for vibration monitoring

MiniMate Plus / MicroMate

manufactured by Instantel

Model No.: 716A0403 / 721A2501

33

Monitoring Methodology

7.7              Vibrograph (velocity seismograph) was deployed at each monitoring station to measure and record the PPV and amplitude of ground motion in three mutually perpendicular directions. Vibration monitoring equipment fulfils the requirements stated in the Government guidelines and is calibrated to HOKLAS standards. Each monitoring would not be more than 10 minutes. Settlement monitoring should be conducted by surveyors manually.

       Alert, Alarm and Action Levels

7.8              The Alert, Alarm and Action (AAA) Levels are given in Table 7.2.

 

Table 7.2      AAA Levels for Monitoring for Cultural Heritage

Parameter

Alert Level

Alarm Level

Action Level

Vibration

ppv: 4.5 mm/s

ppv: 4.8 mm/s

ppv: 5mm/s Maximum Allowable Vibration Amplitude: 0.1mm

Building Settlement Markers

6mm

8mm

10mm

Building Tilting(1)

1:2000

1:1500

1:1000

Remarks:

(1) Building tilting measurement was replaced by building settlement point measurement. The tilting can be calculated by the ratio of the maximum settlement difference between 2 points and the distance between the 2 points.

       Results

7.9              In the reporting month, cultural heritage monitoring was carried out by the Contractor at the aforesaid location on 26 occasions. No AAA Level exceedance was recorded in the reporting month. The monitoring results are presented in Appendix T.

       Mitigation Measures for Cultural Heritage

7.10          According to Condition 3.6 of the EP (EP No.: EP-458/2013/C), to prevent damage to Cha Kwo Ling Tin Hau Temple and its Fung Shui rocks (Child-given rocks) during the construction phase, a temporarily fenced-off buffer zone (Rocks buffer zone is 5 m from the edge of Rocks and 15m from the edge of Rocks alter) with allowance for public access (minimum 1 m) around the temple and the Fung Shui rocks shall be provided. The open yard in front of the temple should be kept as usual for annual Tin Hau festival.

 

7.11          As there is a large buffer distance from the current works to Cha Kwo Ling Tin Hau Temple and the Fung Shui rocks (Child-given rocks), the temporarily fenced-off rocks buffer zone and from the edge of Rocks alter is not required. The fenced-off rocks buffer zone would be implemented when there is construction activities in vicinity of the cultural heritage.

 


8.              LANDSCAPE AND VISUAL IMPACT REQUIREMENTS 

 

8.1              Landscape and visual mitigation measures during the construction phase shall be checked to ensure that they are fully realized and implemented on site.

 

8.2              Site audits were carried out on a weekly basis to monitor and audit the timely implementation of landscape and visual mitigation measures listed in Implementation Schedule and Recommended Mitigation Measures (shown in Appendix N). The summaries of observations and recommendations related to landscape and visual impacts, if any, are shown in Appendix L.

 

8.3              No non-compliance of the landscape and visual impact was recorded in the reporting month.

 


9.                  LANDFILL GAS MONITORING

      Monitoring Requirement

9.1              In accordance with the EM&A Manual, monitoring of landfill gas is required for construction works within the Sai Tso Wan Landfill Consultation Zone during the construction phase. This section presents the results of landfill gas measurements performed by the Contractor.  Appendix A shows the Limit Levels for the monitoring works.

 

9.2              The Landfill Gas Monitoring Proposal, including the monitoring programme and detailed actions, is submitted to the EPD for approval. Details of monitoring in this Proposal is in line with the monitoring requirements stipulated in the EM&A Manual.

Monitoring Parameters and Frequency

9.3              Monitoring parameters for Landfill gas monitoring include Methane, Carbon dioxide and Oxygen.

 

9.4              According to the implementation schedule and recommended mitigation measures of the EM&A Manual, measurements of the following frequencies should be carried out:

 

Excavations deeper than 1m

Ÿ  at the ground surface before excavation commences;

Ÿ  immediately before any worker enters the excavation;

Ÿ  at the beginning of each working day for the entire period the excavation remains open; and 

Ÿ  periodically throughout the working day whilst workers are in the excavation.

 

Excavations between 300mm and 1m deep

Ÿ  directly after the excavation has been completed; and

Ÿ  periodically whilst the excavation remains open.

 

For excavations less than 300mm deep

Ÿ  monitoring may be omitted, at the discretion of the Safety Officer or other appropriately qualified person

Monitoring Locations

9.5              Monitoring of oxygen, methane and carbon dioxide was performed for excavations at 1m depth or more within the Consultation Zone.  In this reporting month, the area required to be monitored for landfill gas are shown below and Figure 6 shows the landfill gas monitoring locations.

   Excavation Locations                        : Portion III

   Manholes and Chambers                    : N/A

   Relocation of monitoring wells          : N/A

   Any other Confined Spaces               : N/A

Monitoring Equipment noise mitigation

9.6              Table 9.1 summarizes the equipment employed by the Contractor for the landfill gas monitoring.

 

Table 9.1                     Landfill Gas Monitoring Equipment

Equipment

Model and Make

Quantity

Portable gas detector

ALTAIR 5X

Multigas Detector

(Serial No. 137333)

1

       Results and Observations

9.7              In the reporting month, landfill gas monitoring was carried out by the Contractor at the aforesaid locations on 130 occasions. No Limit Level exceedance for landfill gas monitoring was recorded in the reporting month. The monitoring results are provided in Appendix R. Copies of calibration certificates are attached in Appendix B.

 


10.          ENVIRONMENTAL AUDIT

Site Audits

10.1          Site audits were carried out on a weekly basis to monitor the timely implementation of proper environmental management practices and mitigation measures in the Project site.  The summaries of site audits are attached in Appendix L.

 

10.2          Joint weekly site audits by the representatives of the Engineer, Contractor and the ET were conducted in the reporting month as shown in below:

Ÿ   Contract No. NE/2015/01: 05, 12, 21 & 26 August 2020

Ÿ   Contract No. NE/2015/02: 06, 13, 20, & 27 August 2020

Ÿ   Contract No. NE/2017/01: 06, 13, 20, & 27 August 2020

Ÿ   Contract No. NE/2017/02: 06, 13, 20, & 27 August 2020

 

10.3          Monthly joint site inspection with the representative of IEC was conducted for NE/2015/01, NE/2015/02, NE/2017/01 and NE/2017/02 on 26, 20, 20 and 20 August 2020 respectively.

 

10.4          The EM&A programme of Contract No. NE/2015/03 had been terminated on 21 April 2020 under the approval of EPD.

Implementation Status of Environmental Mitigation Measures

10.5          According to the EIA Study Report, Environmental Permit and the EM&A Manual of the Project, the mitigation measures detailed in the documents are recommended to be implemented during the construction phase. An updated summary of the Implementation Schedule and Recommended Mitigation Measures is provided in Appendix N.

 

10.6          During site inspections in the reporting month, no non-compliance was recorded on reporting month. The observations and recommendations made during the audit sessions are summarized in Appendix L.

           


11.          WASTE MANAGEMENT

 

11.1          Waste generated from this Project includes inert construction and demolition (C&D) materials, non-inert C&D materials and marine sediments. Inert C&D waste includes soil, broken rock, broken concrete and building debris, while non-inert C&D materials are made up of C&D waste which cannot be reused or recycled and has to be disposed of at the designated landfill sites. Marine sediment shall be expected from excavation and dredging works of this Project.

 

11.2          With reference to relevant handling records of this Project, the quantities of different types of waste generated in the reporting month are summarised and presented in Appendix P.

 

11.3          The Contractors are advised to minimize the wastes generated through the recycling or reusing. All mitigation measures stipulated in the approved EM&A Manual and waste management plans shall be fully implemented. The status of implementation of waste management and reduction measures are summited in Appendix N.


12.          ENVIRONMENTAL NON-CONFORMANCE

Summary of Exceedances

 

12.1          Four (4) Action Level exceedances of noise were recorded due to the documented complaints received in the reporting month. No Limit Level exceedances of construction noise monitoring were recorded for day-time in the reporting month.

 

12.2          Thirty-nine (39) Action Level and one hundred and eight (108) exceedances were recorded in monitoring stations (M) during marine water quality monitoring.

 

12.3          Actions carried out in accordance with the Event and Action Plans in Appendix M are presented in Appendix K Summary of Exceedance.

Summary of Environmental Non-Compliance

 

12.4          No non-compliance was recorded on this reporting month.

Summary of Environmental Complaint

12.5          Six (6) environmental complaints were received in the reporting month. The Cumulative Complaint Log is presented in Appendix O. The investigation status and result is also reported in Appendix O.

Summary of Environmental Summon and Successful Prosecution

12.6          No notification of summon or successful environmental prosecution was received in this reporting period. The Cumulative Log for environmental summon and successful prosecution since the commencement of the Project is presented in Appendix O.

 


13.          FUTURE KEY ISSUES

 

13.1          Tentative construction programmes for the next three months are provided in Appendix Q.

 

13.2          Major site activities to be undertaken for the next reporting period are summarized in Table 13.1.

 

Table 13.1    Summary Table for Site Activities in the next Reporting Period

Contract No. and Project Title

Site Activities (September 2020)

Key Environmental Issues *

NE/2015/01 - Tseung Kwan O Lam Tin Tunnel Main Tunnel and Associated Works

Lam Tin Interchange

1)    EHC2 U-Trough

2)    Site Formation Area 1G1, Area 1G2, Area 2 & Area 5

3)    Site Formation Slope stabilization & Retaining Wall

4)    Administration Building & Bridge Construction

5)    Stormwater Tank Construction

6)    S01_2, EHC1&4 Construction

7)    CKLR Underground Utilities

(A) / (B) / (C) / (D) / (E) / (G)

Main Tunnel

1)    S02_2 Excavation

2)    Main Tunnel Lining Works

(B)

TKO Interchange

1)    Bridge Construction

2)    East Ventilation Building

(A) / (C) / (D) / (E) / (F) / (I)

NE/2015/02 - Tseung Kwan O Lam Tin Tunnel Road P2 and Associated Works

1)        Construction of pillar box and ducting system at Portion IV adjacent to Ocean Shores EVA

2)         Construction of utility trough and road barriers at road P2 CH411 500 and SR2 CH110 CH170 (land section)

3)         Site formation at Road P2 CH500-CH650 and SR1

4)         Road and drainage works at Road P2 CH500 650, slip road SR1 footpath and cycle track, slip road SR2 CH250 CH350

5)         R.C. structure works for U-trough CH318-CH363

6)         ELS at underpass P2 CH105 CH318

7)         Modification of dewatering system (P2 CH105 CH318)

8)         3rd of excavation at CH105 CH318 cofferdam

9)         Installation of de-watering system at S200 CH821 CH105

10)     Installation of socketed H-pile at CT01 CH117 CH336

11)     Construction of abutment

12)     Reposition of Tong Yin Street

13)     Drainage works from SMH9101 SMH9103

14)     Installation of de-watering system at CH821 CH105

15)     Excavation & ELS installation works at CH821 CH105

16)     Construction of sloping seawall

17)     Removal of temporary cofferdam

18)     Construction of seawall coping

19)     Installation of profile barrier at P2 CH500-CH650

20)     Construction of barrier at CH500 CH650

21)     Drainage works at SR1 footpath / cycle truck

22)     Installation of ELS at cofferdam CH105 CH318

23)     Excavation of 3rd layer of ELS at CH105 CH318 cofferdam

24)     Backfilling works for reinstatement of Tong Yin Street

25)     Construction of storm water drain system for SHH 9101 9103

26)     Construction of U-trough at CH821 CH 165 Cofferdam

27)     ELS at CH8214 CH105 Cofferdam

 

NE/2015/03 - Tseung Kwan O Lam Tin Tunnel Northern Footbridge

The construction works under the contract had been completed in December 2019. Materials are being removed from works area.

 

NE/2017/01 Tseung Kwan O Interchange and Associated Works

1)      Dismantling of Temporary Working Platforms

2)      Bored Piling Works

3)      Installation of Precast Pile Cap Shell

4)      Construction of Pile Cap

5)      Construction of Pier

6)      Construction of Pier Head works

7)      Segment erection works

8)      Construction of Bridge Decks

NE/2017/02 Tseung Kwan O - Lam Tin Tunnel - Road P2/D4 and Associated Works

1)      Inspection pit excavation and utility diversion works

2)      Construction of drainage and watermain

3)      Pile cap

4)      Pre-bored Socket-H Pile

5)      Asphalt Paving

6)      Pier, Staircase and Lift Shalt Construction

7)      Road Works

NE/2017/06 Tseung Kwan O Lam Tin Tunnel Traffic Control and Surveillance System(TCSS) and Associated Works

Nil

N/A

Note:

(A)        Watering for dust generation from haul road, stockpiles of dusty materials, exposed site area, excavation works and rock breaking activities;

(B)         Noisy construction activity such as rock-breaking activities and piling works;

(C)         Runoff from exposed slope or site area;

(D)        Wastewater and runoff discharge from site;

(E)         Accumulation of silt, mud and sand along U-channels and sedimentation tanks;

(F)          Set up and implementation of temporary drainage system for the surface runoff;

(G)        Storage of chemicals/fuel and chemical waste/waste oil on site;

(H)        Accumulation and storage of general and construction waste on site; and

(I)           Marine water quality impact and indirect impact to coral communities due to marine construction for TKO-LTT reclamation.

Key Issues for the Coming Month

 

13.3          Key environmental issues in the coming month include:

 

          Watering for dust generation from haul road, stockpiles of dusty materials, exposed site area, excavation works and rock breaking activities;

          Noisy construction activity such as rock-breaking activities and piling works;

          Runoff from exposed slope or site area;

          Wastewater and runoff discharge from site;

          Accumulation of silt, mud and sand along U-channels and sedimentation tanks;

          Set up and implementation of temporary drainage system for the surface runoff;

          Precaution measures in case of heavy rainfall brought along by typhoon;

          Storage of chemicals/fuel and chemical waste/waste oil on site;

          Accumulation and storage of general and construction waste on site; and

          Marine water quality impact and indirect impact to coral communities due to marine construction for TKO-LTT reclamation.


14.          CONCLUSIONS AND RECOMMENDATIONS

Conclusions

14.1          This is the 46th Environmental Monitoring and Audit (EM&A) Report which presents the EM&A works undertaken during the period in August 2020 in accordance with EM&A Manual and the requirement under EP.

Air Quality Monitoring

14.2          No Action/Limit Level exceedance for 1-hour TSP monitoring was recorded.

14.3          No Action/Limit Level exceedance for 24-hour TSP monitoring was recorded.

Construction Noise Monitoring

14.4          Four (4) Action Level exceedances were recorded due to the documented complaints received in this reporting month.

14.5          No Limit Level exceedances was recorded for daytime construction noise in the reporting month. No limit level exceedances were recorded for night-time.

Water Quality Monitoring

14.6          Groundwater quality monitoring had been suspended since October 2019. Details shall be referred to Section 5.1.

14.7          Thirty-nine (39) Action Level and one hundred and eight (108) Limit Level exceedances were recorded in Monitoring Stations (M) during marine water quality monitoring.

14.8          Tunnel construction activities are within +/- 50m of the piezometer gate in plan. Construction phase daily piezometer monitoring by the Contractor commenced in June 2018. It has switched to monthly basis since 3 October 2018 as the construction activity was 120m away from the piezometer gate. No monitoring was conducted in the reporting month.

Ecological Monitoring

14.9          The post-translocation coral monitoring surveys were completed in November 2017.

Monitoring on Cultural Heritage

14.10      No Alert Alarm and Action (AAA) Level exceedance of cultural heritage monitoring on cultural heritage was recorded in the reporting month.

Landscape and Visual Monitoring and Audit

14.11      No non-compliance of the landscape and visual impact was recorded in the reporting month.

Landfill Gas Monitoring

14.12      Monitoring of landfill gases in the reporting month was carried out by the Contractor at excavation location, Portion III. No Limit Level exceedance was recorded.

Environmental Site Inspection

14.13      Joint weekly site inspections were conducted by representatives of the Contractor, Engineer and Environmental Team. During site inspections in the reporting month, no non-compliance was identified. The environmental deficiency observed during the reporting month are shown in Appendix K.

Complaint, Prosecution and Notification of Summons

14.14      Six (6) environmental complaints, no successful prosecution and notification of summon were received during the reporting period.

Recommendations

14.15      The following recommendations were made to the Contractor for the reporting month:
Air Quality Impact

          To regularly apply watering on dry surface should be applied to minimize erosion.

          To aim the water spray at the rock breaking point for effective dust suppression.

          To water materials before loading/unloading.

          To turn off idle equipment.

 

Construction Noise

          To provide sufficient noise barriers for noisy PMEs as practically at LTI according to CNMP.

          To repair the gaps between the noise barriers.

          To place compatible noise barrier close to the breaking point for effective noise screening.

          To erect sound proof canvases on derrick lighter barge

 

Water Quality Impact

          To clear the oil slick and check for any damage of the silt curtain.

          To repair damaged or missing silt curtain

          To check whether the curtain has been set to the seabed.

          To ensure that the pumping rate of bored pile is sufficient to avoid discharging waste water into the sea.

          To clear floating refuse between the cofferdam and silt curtain.

          To clear oil slick within and outside cofferdam.

          To control the amount of loading materials in the barge to avoiding spillage.

          To cover stockpile near seafront.

          To remove wastewater and oil in drip tray.

          To remove pond/still water.

 

Waste/Chemical Management

          To bund or lock the chemical storage area.

          To clear dripping oil from bored piling machine.

          To clear oil slick on seawater.

          To clear oil on the floor.

 

Landscape and Visual

          To avoid placing any construction materials in the tree protection zone.