0463091_1st Annual EM&A_20210303-1-3_page-0001
0463091_1st Annual EM&A_20210303-1-3_page-0002

0463091_1st Annual EM&A_20210303-1-3_page-0003

table of Contents

Executive Summary                                                    

1                          Introduction                                                               

1.1                       Background                                                                  

1.2                       Scope of Report                                                           

1.3                       Organization Structure                                        

1.4                       Summary of Construction Works                      

1.5                       Summary of EM&A Programme Requirements                                                                

2                          EM&A Results                                                                 

2.1                       Air quality                                                                     

2.2                       Landfill Gas Hazard Monitoring                       

2.3                       EM&A Site Inspection                                                 

2.4                       Waste Management Status                                     

2.5                       Environmental Licenses and Permits               

2.6                       Implementation Status of Environmental Mitigation Measures                                                 

2.7                       Summary of Exceedances of the Environmental Quality Performance Limit 

2.8                       Summary of Complaints, Notification of Summons and Successful Prosecutions          

3                          Comparison of EM&A Results with EIA Predictions and Baseline Monitoring Results                                                                             

3.1                       Air Quality Monitoring                                          

3.2                       Landfill Gas Hazard Monitoring                       

3.3                       Waste Management

3.4                       Summary of Monitoring Methodology and Effectiveness                                                                 

3.5                       Summary of Mitigation Measures                      

4                          Future Key Issues                                                         

4.1                       Key Issues for the coming period                       

5                          Conclusions and recommendations                

5.1                       Conclusions                                                                  

 


List of Appendices

Appendix A         Project Organization for Environmental Works

Appendix B         Implementation Schedule of Environmental Mitigation Measures (EMIS)

Appendix C         Summary of Action and Limit Levels

Appendix D         Event Action Plan

Appendix E         Landfill Gas Monitoring Graphical Presentation

Appendix F         Summary of Waste Flow Table

Appendix G         Cumulative Statistics on Exceedances, Complaints, Notifications of Summons and Successful Prosecutions

 

Executive Summary

Under Contract No. HY/2017/10, Gammon Construction Limited (GCL) is commissioned by the Highways Department (HyD) to undertake Northern Connection Tunnel Buildings, Electrical and Mechanical Works of the Tuen MunChek Lap Kok Link Project (TM-CLK Link Project) while AECOM Asia Company Limited was appointed by HyD as the Engineer.  For implementation of the environmental monitoring and audit (EM&A) programme under the Contract, ERM-Hong Kong, Limited (ERM) has been appointed as the Environmental Team (ET) in accordance with Environmental Permit No. EP-354/2009/ARamboll Hong Kong Ltd. was employed by HyD as the Independent Environmental Checker (IEC) and Environmental Project Office (ENPO).  Subsequent applications for variation of environmental permits (VEP), EP-354/2009/B, EP-354/2009/C and EP-354/2009/D, were granted on 28 January 2014, 10 December 2014 and 13 March 2015, respectively.  

The construction phase of the Contract commenced on 7 June 2018 and will tentatively be completed by 2021.  The impact monitoring of the EM&A programme, including air quality and environmental site inspections, were commenced on 7 June 2018.   

This is the First Annual EM&A Report presenting the EM&A works carried out during the period from 1 June 2018 to 31 May 2019 for the Contract No. HY/2017/10 Northern Connection Tunnel Buildings, Electrical and Mechanical Works (the “Contract”) in accordance with the Updated EM&A Manual of the TM-CLK Link Project.  As informed by the Contractor, major activities in the reporting period included:

Land-based Works

·       Site preparation works, Bar bending, Timber formwork, Concreting, Electrical and Mechanical Works and Architectural Builder’s Work and Finishes at Toll Control Building;

·       Bar bending and Timber formwork, Architectural, Builder’s Work and Finishing, Electrical and Mechanical Works at Ventilation Plant Room;

·       ER’s and the Contractor’s site offices erection at WA18;

·       Additional land ground investigation (GI), Socket H-pilling, Excavation and Building Structure at Administration Building, Trial pits and laboratory testing;

·       Electrical and Mechanical Works at North Ventilation Building;

·       Additional land ground investigation (GI), Socket H-pilling, Excavation and Building Structure at Maintenance Depot, Trial pits and laboratory testing;

·       Pre-drilling, Socket H-piling, Excavation and Building Structure at Customs & Excise Department Building;

·       Trial pits, Pre-drilling, Socket H-piling, Excavation and Building Structure at Fire Service Department Building;

·       Electrical and Mechanical Works and Architectural Builders’ Works and Finishes at Kiosk N2;

·       Electrical and Mechanical Works and Architectural Builder's Work and Finishes at Underpass at C3 area;

·       Electrical and Mechanical Works at the Tunnel; and

·       Excavation and Building Structure at Satellite Control Building.

A summary of monitoring and audit activities conducted in the reporting period is listed below ([1]):

24-hour TSP Monitoring                           117 sessions

1-hour TSP Monitoring                             117 sessions

Landfill Gas Hazard Monitoring              65 days

Joint Environmental Site Inspection         52 sessions

Summary of Breaches of Action/Limit Levels

Breaches of Action and Limit Levels for Air Quality

Twenty-five (25) Action Level and two (2) Limit Level exceedances of 1-hour TSP and two (2) Action Level exceedance of 24-hour TSP were recorded by the Environmental Team of Contract No. HY/2012/08 during the reporting period.  No Limit Level exceedance of 24-hour TSP was recorded.

Breaches of Action and Limit Levels for Landfill Gas Hazard Monitoring

No exceedance of Action and Limit Level exceedance was recorded for landfill gas hazard monitoring in the reporting period.

Environmental Complaints, Non-compliance & Summons

There was one (1) environmental complaint received from EPD in the reporting period.  No notification of summons or successful prosecution was received in the reporting period.

Reporting Change

There was no reporting change in the reporting period.

Future Key Issues

Potential environmental impacts arising from the upcoming construction activities are mainly associated with dust, waste management and landfill gas monitoring issues.

 


1                                 Introduction

1.1                             Background

According to the findings of the Northwest New Territories (NWNT) Traffic and Infrastructure Review conducted by the Transport Department, Tuen Mun Road, Ting Kau Bridge, Lantau Link and North Lantau Highway would be operating beyond capacity after 2016.  This forecast has been based on the estimated increase in cross boundary traffic, developments in the Northwest New Territories (NWNT), and possible developments in North Lantau, including the Airport developments, the Lantau Logistics Park (LLP) and the Hong Kong – Zhuhai – Macao Bridge (HZMB).  In order to cope with the anticipated traffic demand, two new road sections between NWNT and North Lantau – Tuen MunChek Lap Kok Link (TM-CLKL) and Tuen Mun Western Bypass (TMWB) are proposed.

An Environmental Impact Assessment (EIA) of TM-CLKL (the Project) was prepared in accordance with the EIA Study Brief (No. ESB-175/2007) and the Technical Memorandum of the Environmental Impact Assessment Process (EIAO-TM).  The EIA Report was submitted under the Environmental Impact Assessment Ordinance (EIAO) in August 2009.  Subsequent to the approval of the EIA Report (EIAO Register Number AEIAR-146/2009), an Environmental Permit (EP-354/2009) for TM-CLKL was granted by the Director of Environmental Protection (DEP) on 4 November 2009, and EP variation (VEP) (EP-354/2009/A) was issued on 8 December 2010.  Subsequent applications for variation of environmental permits (VEPs), EP-354/2009/B, EP-354/2009/C and EP-354/2009/D, were granted on 28 January 2014, 10 December 2014 and 13 March 2015, respectively.

Under Contract No. HY/2017/10, Gammon Construction Limited (GCL) is commissioned by the Highways Department (HyD) to undertake the Northern Connection Tunnel Buildings, Electrical and Mechanical Works of TM-CLKL while AECOM Asia Company Limited was appointed by HyD as the Engineer.  For implementation of the environmental monitoring and audit (EM&A) programme under the Contract, ERM-Hong Kong, Limited (ERM) has been appointed as the Environmental Team (ET).  Ramboll Hong Kong Ltd. was employed by HyD as the Independent Environmental Checker (IEC) and Environmental Project Office (ENPO).

The construction phase of the Contract commenced on 7 June 2018 and will be tentatively completed by 2021.  The impact monitoring phase of the EM&A programme, including air quality and environmental site inspections, commenced on 7 June 2018. 

The general layout plan of the Contract components is presented in Figures 1.1 & 1.2a to c.

                                  

1.2                             Scope of Report

This is the First Annual EM&A Report under the Contract No. HY/2017/10 Tuen MunChek Lap Kok Link – Northern Connection Tunnel Buildings, Electrical and Mechanical Works.  This report presents a summary of the environmental monitoring and audit works from 1 June 2018 to 31 May 2019.

1.3                             Organization Structure

The organization structure of the Contract is shown in Appendix A.  The key personnel contact names and contact details are summarized in Table 1.1 below.

Table 1.1         Contact Information of Key Personnel

Party

Position

Name

Telephone

Fax

HyD (Highways Department)

Project Coordinator

Joseph Lee

2762 4958

3188 6614

 

Senior Engineer

Cheng Pan

 

2762 3383

3188 6614

ER

(AECOM Asia Company Limited)

 

Principle Resident Engineer

S. W. Fok

2293 6200

2293 6300

 

Resident Engineer

 

Desmond Fung

2293 6200

2293 6300

ENPO / IEC

(Ramboll Hong Kong Ltd.)

ENPO Leader

 

Y.H. Hui

3465 2850

3465 2899

IEC

 

Dr. F.C. Tsang

3465 2851

3465 2899

Contractor

(Gammon Construction Limited)

Site Agent

 

Kenneth Tai

9039 4723

-

Environmental Officer

Max Poon

9103 6303

-

 

 

 

 

 

ET (ERM-HK)

ET Leader

Dr. Jasmine Ng

2271 3311

2723 5660

1.4                             Summary of Construction Works

As informed by the Contractor, details of the major works carried out in this reporting period are listed below:

Land-based Works

·     Site preparation works, Bar bending, Timber formwork, Concreting, Electrical and Mechanical Works and Architectural Builder’s Work and Finishes at Toll Control Building;

·     Bar bending and Timber formwork, Architectural, Builder’s Work and Finishing, Electrical and Mechanical Works at Ventilation Plant Room;

·     ER’s and the Contractor’s site offices erection at WA18;

·     Additional land ground investigation (GI), Socket H-pilling, Excavation and Building Structure at Administration Building, Trial pits and laboratory testing;

·     Electrical and Mechanical Works at North Ventilation Building;

·     Additional land ground investigation (GI), Socket H-pilling, Excavation and Building Structure at Maintenance Depot, Trial pits and laboratory testing;

·     Pre-drilling, Socket H-piling, Excavation and Building Structure at Customs & Excise Department Building;

·     Trial pits, Pre-drilling, Socket H-piling, Excavation and Building Structure at Fire Service Department Building;

·     Electrical and Mechanical Works and Architectural Builders’ Works and Finishes at Kiosk N2;

·     Electrical and Mechanical Works and Architectural Builder's Work and Finishes at Underpass at C3 area;

·     Electrical and Mechanical Works at the Tunnel; and

·     Excavation and Building Structure at Satellite Control Building. 

The locations of the construction activities are shown in Figure 1.3.  The Environmental Sensitive Receivers in the vicinity of the Contract are shown in Figure 1.4.

The implementation schedule of environmental mitigation measures is presented in Appendix B.

 

Figure 1.3        Locations of Major Construction Activities in the Reporting Period

1.5                             Summary of EM&A Programme Requirements

The EM&A programme required environmental monitoring for air quality and environmental site inspections for air quality, waste management and landscape and visual impacts.  The EM&A requirements and related findings for each component are described in the following sections, which include:

                                    ·     Monitoring parameters;

                                    ·     Action and Limit levels for all environmental parameters;

                                    ·     Event Action Plan;

                                    ·     Tested environmental impact hypotheses;

                                    ·     Environmental mitigation measures, as recommended in the approved EIA Report; and

                                    ·     Environmental requirement in contract documents.

 

2                                 EM&A Results

The EM&A programme required environmental monitoring for air quality and environmental site inspections for air quality, waste management and landscape and visual impacts.  The EM&A requirements and related findings for each component are summarized in the following sections

2.1                             Air quality

2.1.1                         Monitoring Requirements and Equipment

In accordance with the Updated EM&A Manual and the Enhanced TSP Monitoring Plan, impact 1-hour TSP monitoring was conducted three (3) times every six (6) days and impact 24-hour TSP monitoring was carried out once every six (6) days when the highest dust impact was expected.  1-hr and 24-hr TSP monitoring frequency was increased to three times per day every three days and daily every three days, respectively, as excavation works for launching shaft under Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section commenced on 24 October 2014.

Results of air quality monitoring were adopted from the published EM&A data of Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section ([2]).

The Action and Limit Levels of the air quality monitoring were adopted from the published EM&A reports of Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section ([3]).  The Action and Limit Levels are provided in Appendix C.

The locations of the monitoring stations overlapped with Contract No. HY/2012/08 are shown in Figure 2.1 and presented in Table 2.1.

Table 2.1         Locations of Impact Air Quality Monitoring Stations and its Corresponding Monitoring Requirements

Monitoring Station

Monitoring Period

Location

Description

Parameters & Frequency

ASR1

From 1 June 2018 to 31 May 2019

Tuen Mun Fireboat Station

 

Office

TSP monitoring

Ÿ  1-hour Total Suspended Particulates (1-hour TSP, µg/m3), 3 times in every 6 days

Ÿ  24-hour Total Suspended Particulates (24-hour TSP, µg/m3), daily for 24-hour in every 6 days

Enhanced TSP monitoring (commenced on 24 October 2014 under Contract No. HY/2012/08)

Ÿ  1-hour Total Suspended Particulates (1-hour TSP, µg/m3), 3 times in every 3 days

Ÿ  24-hour Total Suspended Particulates (24-hour TSP, µg/m3), daily for 24-hour in every 3 days

ASR5

 

Pillar Point Fire Station

 

Office

AQMS1

 

Previous River Trade Golf

 

Bare ground

ASR6

 

Butterfly Beach Laundry

 

Office

ASR10

 

Butterfly Beach Park

Recreational uses

2.1.2                         Results and Observations

Results of air quality monitoring were adopted from the published EM&A data of Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section ([4]).

Twenty-five (25) Action Level and two (2) Limit Level exceedances of 1-hour TSP and two (2) Action Level exceedance of 24-hour TSP were recorded by the Environmental Team of Contract No. HY/2012/08 during the reporting period. The exceedances were considered not related to this Contract upon further investigation and the investigation reports were presented in Appendix G of the Third to Seventh and Ninth Monthly EM&A Reports and Appendix J of the Eighth, Tenth and Twelfth Monthly EM&A Reports.   No action is required to be undertaken in accordance with the Event Action Plan as presented in Appendix D.

2.2                             Landfill Gas Hazard Monitoring

In accordance with the Updated EM&A Manual of the TM-CLK Link Project, landfill gas hazard monitoring should be perform to ensure that the works area at Pillar Point Valley (PPV) Landfill is free of landfill gas during any excavations works.  A total of 65 days of landfill gas hazard monitoring was conducted during the reporting period. 

The schedules for landfill gas hazard monitoring were provided in the Eighth, Tenth to Twelfth Monthly EM&A Reports.

The Action and Limit Levels of the landfill gas hazard monitoring were adopted from the Undated EM&A Manual of the TM-CLK Link Project and are provided in Appendix C.

2.2.1                         Results and Observations

Results for landfill gas hazard monitoring are summarized in Table 2.2 and the monitoring results were presented graphycally in Appendix E.

No exceedance of Action and Limit Levels for methane, oxygen and carbon dioxide was recorded in the reporting period.

Table 2.2         Summary of Landfill Gas Hazard Monitoring Results in the Reporting Period

 

 

Average (%)

Range (%)

Action / Limit Level (%)

January 2019, March – May 2019

Methane

0

0

10/20

Oxygen

20.8

20.7-20.9

19/18

Carbon Dioxide

0.07

0.07-0.08

0.5/1.5

2.3                             EM&A Site Inspection

Site inspections were carried out on weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract.  Fifty-two (52) site inspections were carried out in the reporting period.  Key observations were summarized in the section of EM&A Site Inspection in the First to Twelfth Monthly EM&A Reports.  The Contractor has rectified all of the observations identified during environmental site inspections in the reporting period.

2.4                             Waste Management Status

The Contractor had submitted application form for registration as chemical waste producer under the Contract.  Sufficient numbers of receptacles were available for general refuse collection and sorting.

Wastes generated during this reporting period included mainly construction wastes (inert and non-inert).  Reference has been made to the waste flow table prepared by the Contractor (Appendix F).  The quantities of different types of wastes are summarized in Table 2.3.

Table 2.3       Quantities of Different Waste Generated in the Reporting Period

Month/Year

Inert C&D Materials (a)  (m3)

Inert Construction Waste Re-used

(m3)

Non-inert Construction Waste (b) (kg)

Imported Fill (m3)

Recyclable Materials (c)  (kg)

Chemical Wastes (kg)

 

June 2018

2085

0

3,750

0

0

 

0

 

July 2018

830

0

15,190

0

0

 

0

 

August 2018

825

0

103,420

0

0

 

0

 

September 2018

205

0

22,150

0

0

 

0

 

October 2018

720

0

26,280

0

63

 

0

 

November 2018

3660

10

26,530

0

0

 

0

 

December 2018

7,592

602

33,280

0

0

 

0

 

January 2019

2,089

150

74,680

0

42

 

0

 

February 2019

2,474

345

67,230

0

49

 

0

 

March 2019

79

0

73,690

0

0

 

0

 

April 2019

13

0

56,730

0

0

 

0

 

May 2019

0

0

62,240

0

0

 

0

 

 

Notes:

 

(a)    Inert construction wastes include hard rock and large broken concrete disposed as public fill.

(b)    Non-inert construction wastes include general refuse disposed at landfill.

(c)    Recyclable materials include metals, paper, cardboard, plastics, timber and others.

The Contractor was advised to properly maintain on site C&D materials and waste collection, sorting and recording system, dispose of C&D materials and wastes at designated ground and maximize reuse/ recycle of C&D materials and wastes.  The Contractor was also reminded to properly maintain the site tidiness and dispose of the wastes accumulated on site regularly and properly.

For chemical waste containers, the Contractor was reminded to treat properly and store temporarily in designated chemical waste storage area on site in accordance with the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes.

2.5                             Environmental Licenses and Permits

The status of environmental licensing and permit is summarized in Table 2.4 below.


Table 2.4         Summary of Environmental Licensing and Permit Status

License/ Permit

License or Permit No.

Date of Issue

Date of Expiry

License/ Permit Holder

Remarks

Environmental Permit

EP-354/2009/D

13 March 2015

N/A

HyD

Tuen Mun- Chek Lap Kok Link

APCO Construction Dust Notification

433493

14 May 2018

N/A

GCL

For Tuen Mun working area

Construction Waste Billing Account

7030836

15 May 2018

N/A

GCL

N/A

Chemical Waste Producer Registration

5213-422-G2827-01

13 June 2018

N/A

GCL

N/A

Discharge License under WPCO for Buildings at C2 area

WT00031783-2018

22 October 2018

31 October 2023

GCL

Sampling Frequency: Bimonthly

Discharge License under WPCO for Buildings at C3 area

WT00032062-2018

30 October 2018

31 October 2023

GCL

Sampling Frequency: Quarterly

Construction Noise Permit

GW-RW0262-18

9 July 2018

9 January 2019

GCL

For Toll Control Building, Administration Building and WA18

Construction Noise Permit

GW-RW0384-18

14 September 2018

6 March 2019

GCL

For Toll Control Building, Administration Building, Maintenance Depot and WA18

Construction Noise Permit

GW-RW0451-18

2 November 2018

25 April 2019

GCL

For Toll Control Building, Administration Building, Maintenance Depot and WA18

Construction Noise Permit

GW-RW0560-18

28 December 2018

18 June 2019

GCL

For Toll Control Building, Administration Building, Maintenance Depot and WA18

Construction Noise Permit

GW-RW0037-19

28 January 2019

23 July 2019

GCL

For Toll Control Building, Administration Building, Maintenance Depot and WA18

Construction Noise Permit

GW-RW0135-19

27 March 2019

30 September 2019

GCL

For Toll Control Building, Administration Building, Maintenance Depot, FSD, C&ED, Bouundary Wall and WA18

Construction Noise Permit

GW-RS0202-19

4 March 2019

3 September 2019

GCL

For Kiosk S2

Construction Noise Permit

GW-RS0340-19

18 April 2019

17 October 2019

GCL

For Kiosk S2

 

 

2.6                             Implementation Status of Environmental Mitigation Measures

In response to the site audit findings, the Contractors carried out all corrective actions.

A summary of the Implementation Schedule of Environmental Mitigation Measures (EMIS) is presented in Appendix B. The necessary mitigation measures relevant to this Contract were implemented properly.

2.7                             Summary of Exceedances of the Environmental Quality Performance Limit

Twenty-five (25) Action Level and two (2) Limit Level exceedances of 1-hour TSP and two (2) Action Level exceedance of 24-hour TSP were recorded by the Environmental Team of Contract No. HY/2012/08 during the reporting period. The exceedances were considered not related to this Contract upon further investigation and the investigation reports were presented in Appendix G of the Third to Seventh and Ninth Monthly EM&A Reports and Appendix J of the Eighth, Tenth and Twelfth Monthly EM&A Reports.   No action is required to be undertaken in accordance with the Event Action Plan as presented in Appendix D.

No exceedance of Action and Limit Levels for methane, oxygen and carbon dioxide was recorded landfill gas hazard monitoring in the reporting period.

Cumulative statistics are provided in Appendix G.

2.8                             Summary of Complaints, Notification of Summons and Successful Prosecutions

The Environmental Complaint Handling Procedure is provided in Figure 2.2.

There were one (1) complaint received from EPD.  Upon investigation, there were no adequate evidences to conclude that the complaint cases were related to this Contract and the investigation report was presented in Appendix J of the Twelfth EM&A Report

No notification of summons or successful prosecution was received in the reporting period.

Statistics on complaints, notifications of summons, successful prosecutions are summarized in Appendix G.

 

 

3                                 Comparison of EM&A Results with EIA Predictions and Baseline Monitoring Results

The EM&A results in the reporting period are compared to the predictions from EIA Report and baseline monitoring result for the sake of reviewing the validity of EIA predictions.

Land based construction activities were conducted during the reporting period.  At the same time, monitoring on air quality, landfill gas hazard monitoring and waste were undertaken per plan.

3.1                             Air Quality Monitoring

Based on the findings presented in TM-CLKL EIA study, the major sources of dust nuisance arising from the Northern Connection are related to excavation, wind erosion from reclaimed areas, open sites and stockpiling areas.  Therefore, during these construction activities, the TSP monitoring frequency will be increased at all air quality monitoring stations such that any deteriorating air quality can be readily detected and timely action taken to rectify the situation.  Comparison of EIA prediction, average baseline monitoring and average impact monitoring results of TSP is presented in Table 3.1.

Results of air quality monitoring were adopted from the published EM&A data of Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section ([5]).

Table 3.1         Comparison of Impacts on Air Quality (in μg/m³) between EIA Prediction and Impact Monitoring Period

Station

EIA Predicted Maximum  

Maximum Impact Monitoring

Average Impact Monitoring

Maximum Baseline Monitoring

Average Baseline Monitoring

ASR1

(1-hour)

195

584

137

182

125

ASR1

(24-hour)

148

237

83

173

128

ASR5

(1-hour)

235

425

159

211

138

ASR5

(24-hour)

133

196

93

249

167

AQMS1

(1-hour)

N/A

311

97

196

131

AQMS1

(24-hour)

N/A

127

57

211

127

AQMS2/ASR6

(1-hour)

226

478

117

226

135

AQMS2/ASR6

(24-hour)

153

191

70

221

166

ASR10

(1-hour)

189

242

75

215

134

ASR10

(24-hour)

112

146

51

181

129

Notes: Maximun baseline monitoring and average baseline monitoring were adopted from the published EM&A report of Contract No. HY/2012/08 Tuen Mun-Chek Lap Kok Link – Northern Connection Sub-sea Tunnel Section.

 

As shown in Table 3.1, maximum 1-hour and 24-hour TSP impact monitoring levels at ASR1, ASR5, ASR6 and ASR10 were higher than their corresponding EIA predicted maximum levels.  In baseline monitoring, maximum baseline levels of 1-hour TSP at ASR10 and 24-hour TSP at ASR1, ASR5, ASR6 and ASR10 were also higher than EIA maximum prediction.  These recorded maximum monitoring values during both impact and baseline monitoring periods are thus considered as sporadic events and fluctuation of regional air quality.  Overall, most of the monitoring results were within EIA predicted levels during impact monitoring period.  It thus appeared that the construction activities of the Contract did not cause significant impact on air quality with lower average TSP levels during impact monitoring/similar average TSP levels between the baseline and impact monitoring.  The EIA has concluded that no adverse residual construction dust impacts will occur after implementation of mitigation measures.  Thus, the monitoring results are considered to be in line with the EIA prediction.

3.2                             Landfill Gas Hazard Monitoring

In accordance with the Updated EM&A Manual of the TM-CLK Link Project, landfill gas hazard monitoring should be perform to ensure that the works area at Pillar Point Valley (PPV) Landfill is free of landfill gas during any excavations works.  A total of 65 days of landfill gas hazard monitoring was conducted during the reporting period.

No exceedance of Action and Limit Levels for methane, oxygen and carbon dioxide was recorded in the reporting period.

3.3                             Waste Management

For wastes generated from the construction activities include C&D materials (inert and non-inert), chemical wastes and recyclable materials, the wastes generated were in line with the EIA predictions.  The wastes were disposed of in accordance with the recommendations of the EIA.

3.4                             Summary of Monitoring Methodology and Effectiveness

The EM&A monitoring programme has been reviewed and was considered effective and adequate to cater for the nature of works in progress.  No change to the monitoring programme was considered to be necessary.

The EM&A programme will be evaluated as appropriate in the next reporting period and improvements in the EM&A programme will be recommended if deemed necessary.

3.5                             Summary of Mitigation Measures

The mitigation measures stipulated in the Updated EM&A Manual were undertaken by the Contractor in the reporting period.  The mitigation measures were reviewed and considered effective.  No addition or change on mitigation measures was considered to be necessary.

 

4                                 Future Key Issues

4.1                             Key Issues for the coming period

Potential environmental impacts arising from the upcoming construction activities are mainly associated with dust, waste management and landfill gas monitoring issue.

 

5                                 Conclusions and recommendations

5.1                             Conclusions

This First Annual EM&A Report presents the findings of the EM&A activities undertaken during the period from 1 June 2018 to 31 May 2019, in accordance with the Updated EM&A Manual and the requirements of EP-354/2009/D.

Air quality (including 1-hour TSP and 24-hour TSP) was carried out in this reporting period.

Twenty-five (25) Action Level and two (2) Limit Level exceedances of 1-hour TSP and two (2) Action Level exceedance of 24-hour TSP were recorded by the Environmental Team of Contract No. HY/2012/08 during the reporting period.  No Limit Level exceedance of 24-hour TSP was recorded.  The exceedances were considered not related to this Contract upon further investigation and the investigation reports were presented in Appendix G of the Third to Seventh and Ninth Monthly EM&A Reports and Appendix J of the Eighth, Tenth and Twelfth Monthly EM&A Reports.   No action is required to be undertaken in accordance with the Event Action Plan as presented in Appendix D.

No exceedance of Action and Limit Levels for methane, oxygen and carbon dioxide was recorded during landfill gas hazard monitoring in the reporting period.

Environmental site inspection was carried out fifty-two (52) times in the reporting period.  Remedial actions recommended for the deficiencies identified during the site audits were properly implemented by the Contractor.

There was one (1) environmental complaint received from EPD in the reporting period.  Upon investigation, there were no adequate evidences to conclude that the complaint cases were related to this Contract and the investigation report was presented in Appendix J of the Twelfth EM&A Report

There was no notification of summons or successful prosecution recorded in the reporting period.

The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

 


([1])       ET justification on the Contract Specific Environmental Monitoring and Audit activities under this Contract was submitted to ENPO on 11 September 2018

([2])       Published EM&A data for impact air quality monitoring by Contract No. HY/2012/08 are available at: http://www.hzmbenpo.com/

([3])       Published EM&A reports of Contract No. HY/2012/08 are available at: http://www.hzmbenpo.com/

([4])       Published EM&A data for impact water quality monitoring by Contract No. HY/2012/08 are available at: http://www.hzmbenpo.com/

([5])       Published EM&A data for impact air quality monitoring by Contract No. HY/2012/08 are available at: http://www.hzmbenpo.com/