CONTENTS

 

 

 

Page

 

 

 

1.       

INTRODUCTION

1-2

 

 

 

1.1   

Project Background

1-2

1.2   

Requirements under the Environmental Impact Assessment Ordinance

1-2

1.3   

Purpose of the EIA Study

1-3

1.4   

Objectives of the EIA Study

1-3

1.5   

Structure of the Report

1-4

 

 

 

2.       

PROJECT DESCRIPTION

2-2

 

 

 

2.1   

Project Objectives

2-2

2.2   

Site History and Project Location

2-2

2.3   

Project Scope

2-3

2.4   

Need for the Project

2-4

2.5   

Benefits of the Project

2-5

2.6   

Without Project Scenario

2-6

2.7   

With Project Scenario

2-6

2.8   

Design Considerations

2-7

2.9   

Consideration of Alternatives Location, Design and Layout

2-7

2.10           

Construction Aspects of the Project

2-14

2.11           

Consideration of Alternative Construction Methods

2-16

2.12           

Consideration of Alternative Construction Sequence

2-17

2.13           

Implementation Programme

2-17

2.14           

Concurrent Projects

2-18

2.15           

Sustainability Considerations

2-20

2.16           

Continuous Public Involvement

2-21

2.17           

References

2.23

 

 

 

3.       

AIR QUALITY IMPACT ASSESSMENT

3-2

 

 

 

3.1   

Introduction

3-2

3.2   

Statutory Requirements and Evaluation Criteria

3-2

3.3   

Study Area

3-3

3.4   

Identification of Air Sensitive Receivers

3-3

3.5   

Existing Air Quality

3-4

3.6   

Evaluation of Impacts during Construction Phase

3-7

3.7   

Evaluation of Impacts during Operation Phase

3-10

3.8   

Mitigation Measures

3-10

3.9   

Potential for Cumulative Impacts

3-11

3.10           

Residual Impacts

3-12

3.11           

Monitoring and Audit Requirements

3-13

3.12           

Conclusion

3-13

 

 

 

4.       

NOISE IMPACT ASSESSMENT

4-2

 

 

 

4.1   

Introduction

4-2

4.2   

Environmental Legislation, Policies, Standards and Criteria

4-2

4.3   

Baseline Conditions

4-7

4.4   

Noise Sensitive Receivers

4-8

4.5   

Potential Sources of Impacts

4-9

4.6   

Assessment Methodology

4-11

4.7   

Impact Assessment

4-14

4.8   

Mitigation Measures

4-16

4.9   

Cumulative Impacts

4-22

4.10           

Residual Impacts

4-22

4.11           

Monitoring and Audit Requirement

4-23

4.12           

Conclusion

4-23

 

 

 

5.       

WATER QUALITY IMPACT ASSESSMENT

5-2

 

 

 

5.1   

Introduction

5-2

5.2   

Environmental Legislation, Policies, Standards and Criteria

5-2

5.3   

Study Area

5-7

5.4   

Baseline Water Quality Conditions

5-7

5.5   

Water Sensitive Receivers

5-12

5.6   

Water Sources of Impacts

5-12

5.7   

Impact Assessment

5-13

5.8   

Mitigation Measures

5-17

5.9   

Cumulative Impacts

5-22

5.10           

Residual Impacts

5-24

5.11           

Monitoring and Audit Requirement

5-24

5.12           

Conclusion

5-25

 

 

 

6.       

WASTE MANAGEMENT AND LAND CONTAMINATION

6-2

 

 

 

6.1   

Introduction

6-2

6.2   

Relevant Legislation, Policies, Standards and Criteria

6-2

6.3   

Assessment Methodology

6-6

6.4   

Expected Waste Sources

6-6

6.5   

Waste Management Assessment

6-7

6.6   

Mitigation Measures

6-13

6.7   

Land Contamination

6-18

6.8   

Residual Environmental Impacts

6-21

6.9   

Environmental Monitoring and Audit Requirements

6-21

6.10           

Conclusion

6-22

 

 

 

7.       

ECOLOGICAL IMPACT ASSESSMENT

7-2

 

 

 

7.1   

Introduction

7-2

7.2   

Statutory Requirements and Evaluation Criteria

7-3

7.3   

Assessment Area

7-6

7.4   

Methodology for Baseline Establishment

7-6

7.5   

Baseline Condition

7-8

7.6   

Identification of Ecological Impacts

7-10

7.7   

Potential for Cumulative Impacts

7-28

7.8   

Mitigation

7-30

7.9   

Precautionary Measures

7-46

7.10           

Residual Impacts

7-46

7.11           

Monitoring and Audit Requirements

7-48

7.12           

Conclusion

7-48

7.13           

References

7-51

 

 

 

8.       

FISHERIES IMPACT ASSESSMENT

8-2

 

 

 

8.1   

Introduction

8-2

8.2   

Statutory Requirements and Evaluation Criteria

8-2

8.3   

Assessment Area

8-2

8.4   

Assessment Methodology

8-3

8.5   

Baseline Condition

8-3

8.6   

Evaluation of Impacts during Construction Phase

8-8

8.7   

Evaluation of Impacts during Operational Phase

8-10

8.8   

Mitigation Measures

8-11

8.9   

Potential for Cumulative Impacts

8-13

8.10           

Residual Impacts

8-13

8.11           

Monitoring and Audit Requirements

8-13

8.12           

Conclusion

8-13

8.13           

References

8-14

 

 

 

9.       

CULTURAL HERITAGE IMPACT ASSESSMENT

9-2

 

 

 

9.1   

Introduction

9-2

9.2   

Relevant Legislation, Standards & Guidelines

9-2

9.3   

BHIA Methodology

9-5

9.4   

Baseline Review

9-9

9.5   

Impact Assessment

9-14

9.6   

Mitigation Recommendations

9-30

9.7   

Cumulative and Residual Impacts

9-32

9.8   

Conclusion

9-32

9.9   

Environmental Monitoring and Audit

9-33

9.10           

References and Bibliography

9-38

 

 

 

10.    

LANDSCAPE AND VISUAL IMPACT ASSESSMENT

10-2

 

 

 

10.1           

Introduction

10-2

10.2           

Environmental Legislation, Policies, Standards and Criteria

10-2

10.3           

Scope and Content of Study

10-7

10.4           

Landscape and Visual Impact Assessment Methodology

10-9

10.5           

Planning and Development Control Framework

10-17

10.6           

Baseline Study

10-21

10.7           

Landscape Impact Assessment

10-42

10.8           

Visual Impact Assessment

10-67

10.9           

Cumulative Impacts

10-93

10.10       

Residual Impact

10-93

10.11       

Monitoring and Audit Requirements

10-94

10.12       

Conclusion

10-95

 

 

 

11.    

ENVIRONMENTAL MONITORING AND AUDIT REQUIREMENTS

11-2

 

 

 

11.1           

Introduction

11-2

11.2           

EM&A Manuel

11-2

11.3           

Air Quality

11-3

11.4           

Noise

11-3

11.5           

Water Quality

11-4

11.6           

Waste Management

11-4

11.7           

Ecology

11-5

11.8           

Fisheries

11-6

11.9           

Cultural Heritage

11-6

11.10       

Landscape and Visual

11-6

11.11       

Implementation Schedule

11-7

 

 

 

12.    

SUMMARY OF ENVIRONMENTAL OUTCOMES 

12-2

 

 

 

12.1           

Introduction

12-2

12.2           

Environmental Benefits of the Project

12-2

12.3           

Environmental Friendly Options Considered

12-3

12.4           

Environmental Friendly Design Recommended

12-4

12.5           

Estimated Population and Environmentally Sensitive Areas Protected

12-5

12.6           

Key Environmental Problems Avoided and Compensation Areas Included

12-6

12.7           

Environmental Benefits of Environmental Protection Measures Recommended

12-7

 

 

 

13.    

CONCLUSION

13-2

 

 

 

13.1           

Introduction

13-2

13.2           

Air Quality Impact

13-3

13.3           

Noise Impact

13-3

13.4           

Water Quality Impact

13-3

13.5           

Waste Management and Land Contamination

13-4

13.6           

Ecological Impact

13-5

13.7           

Fisheries Impact

13-7

13.8           

Cultural Heritage Impact

13-7

13.9           

Landscape and Visual Impact

13-8

13.10       

Environmental Monitoring and Audit (EM&A)

13-8

13.11       

Overall Conclusion

13-9

 

 

 

 

END OF TEXT

 

 

 

 


LIST OF TABLES

 

Table 2.1

Summary of Project Scope

Table 2.2

Rainfall Increase and Sea Level Rise due to Climate Change

Table 2.3

Comparison Summary of Options A and B

Table 2.4

Summary of Operation Scenarios for the Barrage Scheme

Table 2.5

Key Construction Phases & Description

Table 2.6

Potential Concurrent Projects

Table 3.1

Hong Kong Air Quality Objectives

Table 3.2

Identified Representative Air Sensitive Receivers

Table 3.3

5-year Averaged Annual Background Concentration of Air Pollutants recorded at Yuen Long Station by EPD for the Period of 2015-2019

Table 3.4

Dust Concentrations extracted from PATH-2016 Model

Table 4.1

EIAO-TM Day-time Construction Noise Standards

Table 4.2

Area Sensitivity Ratings

Table 4.3

Acceptable Noise Levels (ANLs) for General Construction Works to be carried out during Restricted Hours (GW-TM)

Table 4.4

ANLs for Fixed Noise Source under NCO

Table 4.5

Measured Baseline Noise Levels

Table 4.6

Representative Noise Sensitive Receivers (NSRs)

Table 4.7

Predicted Construction Noise Levels (Without Mitigation Measures)

Table 4.8

Predicted Fixed Plant Noise Levels due to the Proposed Pumping Stations

Table 4.9

Sound Power Level of Quiet PME

Table 4.10

Sound Pressure Level of Quiter Equipment/Methods

Table 4.11

Predicted Construction Noise Levels (With Mitigation Measures)

Table 5.1

Water Quality Objectives of the Deep Bay Water Control Zones

Table 5.2

Summary of River Water Quality Monitoring Data collected by EPD River Water Quality Monitoring Programme for Stations in YLTN, MN and SHN (2018)

Table 5.3

Summary of River Water Quality Monitoring Data collected by EPD River Water Quality Monitoring Programme for Stations in Kam Tin River (2018)

Table 5.4

Summary of EPD¡¦s Routine Marine Water Quality Data for Inner Deep Bay WCZ in Year 2018

Table 5.5

Water Sampling Result in YLTN EIA

Table 6.1

Government Facilities for Disposal of C&D Materials

Table 6.2

Estimated Quantities of C&D Materials and Other Wastes during Construction

Table 6.3

Estimated Quantities of Sediment under Disposal Option

Table 6.4

Review of Historical Aerial Photographs

Table 7.1

Ecological Survey Programme from July 2019 to July 2020

Table 7.2

Habitat Evaluation

Table 7.3

Estimated Loss of Area of Each Habitat Type

Table 7.4

Comparison of Waterbirds¡¦ Abundance among the Assessment Area, Nam Sang Wai, Shan Pui River and Deep Bay Area during the Ecological Survey Period

Table 7.5

Potential Cumulative Ecological Impact from Concurrent Projects

Table 7.6

Summary of Construction Phase and Operational Phase Impacts

Table 8.1

Baseline Information of Fisheries Resources in the Assessment Area

Table 8.2

Fishpond Area and Annual Fish Production in Hong Kong from 2009 to 2018

Table 8.3

Recent Figures of Hong Kong Capture Fisheries Industry

Table 8.4

Summary of Capture Fisheries Data in Deep Bay WCZ

Table 8.5

Top Ten Families / Groups of Fish Catch in Hong Kong Waters

Table 8.6

Fisheries Impact on Active and Inactive Fishponds within the Assessment Area

Table 9.1

Recorded Not-Graded and Nil-Grade Buildings

Table 9.2

Graded Historic Buildings

Table 9.3

Other Heritage Items (Not-Graded and Nil-Grade)

Table 9.4

Fung Shui Woodlands

Table 9.5

Summary of Recommended Mitigation Measures Prior and During the Construction Phase

Table 10.1

Relationship between Receptor Sensitivity and Magnitude of Change in Defining Impact Significance

Table 10.2

Landscape Resources

Table 10.3

Sensitivity of Landscape Resources

Table 10.4

Landscape Character Areas

Table 10.5

Sensitivity of Landscape Character Areas

Table 10.6

Key Visually Sensitive Receivers (VSRs)

Table 10.7

Magnitude of Landscape Change during the Construction and Operation Phases before Mitigation

Table 10.8

Proposed Construction Phase Landscape and Visual Mitigation Measures

Table 10.9

Proposed Operation Phase Landscape and Visual Mitigation Measures

Table 10.10

Significance of Landscape Impacts in Construction and Operation Phases (Adverse Impacts unless otherwise stated)

Table 10.11

Magnitude of Visual Change during the Construction and Operation Phases before Mitigation

Table 10.12

Significance of Visual Impacts in Construction and Operation Phases

Table 10.13

Summary of Visual Impacts of VPs at Photomontage Viewpoints

Table 12.1

Summary of Key Environmental Problems Avoided and Sensitive Areas Protected

Table 12.2

Key Recommended Mitigation Measures and Associated Environmental Benefits

 

LIST OF APPENDICES (VOLUME 2)

Appendix 1.1

Engineering Drawings

Drawing No. 400171/LAY/001

Drawing No. 400171/LAY/002

Drawing No. 400171/LAY/003

Drawing No. 400171/LAY/004

Drawing No. 400171/LAY/101

Drawing No. 400171/LAY/102

Drawing No. 400171/LAY/201

Drawing No. 400171/LAY/202

Drawing No. 400171/LAY/402

Drawing No. 400171/LAY/501

Drawing No. 400171/LAY/502

Drawing No. 400171/LAY/601

Appendix 2.1

Flood Extent Maps of ¡§Without Project Scenario¡¨

Appendix 2.2

Flood Extent Maps of ¡§With Project Scenario¡¨

Appendix 2.3

Comparison Table of the Proposed Layouts

Appendix 2.4

Visual Illustration and Indicative Details of Conceptual Operation Modes

Appendix 2.5

Public Comments on Project Profile

Appendix 4.1

Construction Programme

Appendix 4.2

Plant Inventory

Appendix 4.3

Noise Calculation for Predicted Façade Noise Levels During Daytime Period

Appendix 4.4

Plant Inventory

Appendix 4.5

Calculation for Mitigated Noise Levels at the Representative NSRs

Appendix 4.6

Noise Calculation for Predicted Noise Levels at All the Representative NSRs

Appendix 4.7

Baseline Noise Measurement Locations

Appendix 4.8

Locations of Identified Representative NSRs

Appendix 4.9

Schematic Configuration of Movable Noise Barrier

Appendix 4.10

Noise Insulating Sheet

Appendix 6.1a

Sediment Sampling & Testing Plan

Appendix 6.1b

CEDD¡¦s memo on Rationale for Sediment Removal

Appendix 6.2

Sediment Quality Report

Appendix 6.3

Historical Aerial Photos

Appendix 6.4

Existing Site Conditions

Appendix 6.5

Relevant Correspondences with FSD and EPD

Appendix 7.1

Ecological Baseline Report

Appendix 9.1

Graded Historic Buildings Catalogue 

Appendix 9.2

Not-Graded and Nil-Grade Built Heritage Catalogue

Appendix 9.3

Fung Shui Woodlands Catalogue

Appendix 10.1

Broad Brush Tree Survey

Appendix 11.1

Implementation Schedule of Environmental Protection Measures for the Project

Appendix 13.1

Summary of Environmental Impacts Associated with the Project

Appendix 13.2

Key Assessment Assumptions and Limitations of Assessment Methodologies

 

LIST OF FIGURES (VOLUME 3)

 

Figure 1.1

Location Plan of Sensitive Receivers and Area of Conservation Importance

Figure 3.1

Air Sensitive Receivers (Key Plan)

Figure 3.2

Air Sensitive Receivers

Figure 3.3

Air Sensitive Receivers

Figure 3.4

Air Sensitive Receivers

Figure 3.5

Air Sensitive Receivers

Figure 3.6

Air Sensitive Receivers

Figure 4.1

Noise Sensitive Receivers and Proposed Works Areas (Key Plan)

Figure 4.2

Noise Sensitive Receivers and Proposed Works Areas

Figure 4.3

Noise Sensitive Receivers and Proposed Works Areas

Figure 4.4

Noise Sensitive Receivers and Proposed Works Areas

Figure 4.5

Noise Sensitive Receivers and Proposed Works Areas

Figure 4.6

Noise Sensitive Receivers and Proposed Works Areas

Figure 5.1

EPD¡¦s Marine Water Quality Monitoring Station

Figure 5.2

Water Sensitive Receivers

Figure 5.3

Arrangement of Works within Yuen Long Nullah

Figure 5.4

General Arrangement of Energy Dissipators

Figure 6.1

Sampling Location Plan

Figure 7.1

Proposed Layout of the Barrage overlaid with Habitat Map

Figure 8.1

Location of Oyster Culture Area in Deep Bay

Figure 8.2

Active and Inactive Fishponds in the Assessment Area

Figure 9.1

Location of Heritage Resources within the Built Heritage Survey Study Area

Figure 9.2

Built Heritage Resources in Lung Tin Tsuen

Figure 9.3

Built Heritage Resources in Ko Po Tsuen

Figure 9.4

Built Heritage Resources in Sham Chung Tsuen

Figure 9.5

Built Heritage Resources in Tin Liu Tsuen

Figure 9.6

Built Heritage Resources in Ma Tin Tsuen

Figure 9.7

Built Heritage Resources in Tai Kiu

Figure 9.8

Built Heritage Resources in Wang Chau Tung Tau Wai

Figure 9.9

Built Heritage Resources in Wang Chau Lam Uk Tsuen and Yeung Uk Tsuen

Figure 9.10

Built Heritage Resources in Shan Pui Chung Hau Tsuen North

Figure 9.11

Built Heritage Resources in Shan Pui Chung Hau Tsuen South

Figure 10.00a

Aerial Photograph ¡V Yuen Long Barrage Scheme

Figure 10.00b

Aerial Photograph - Kam Tin River Parapet Modifications

Figure 10.01a

Site Layout Plan ¡V Yuen Long Barrage Scheme

Figure 10.01b

Site Layout Plan ¡V Kam Tin River Parapet Modifications

Figure 10.02

Review of Planning and Development Control Framework

Figure 10.10

Landscape Resources (Sheet 1 of 4)

Figure 10.11

Landscape Resources (Sheet 2 of 4)

Figure 10.12

Landscape Resources (Sheet 3 of 4)

Figure 10.13

Landscape Resources (Sheet 4 of 4)

Figure 10.14

Landscape Resources Photographs (Sheet 1 of 3)

Figure 10.15

Landscape Resources Photographs (Sheet 2 of 3)

Figure 10.16

Landscape Resources Photographs (Sheet 3 of 3)

Figure 10.17a

Residual Impacts on Landscape Resources with Mitigation Year10 (Sheet 1 of 4)

Figure 10.17b

Residual Impacts on Landscape Resources with Mitigation Year10 (Sheet 2 of 4)

Figure 10.17c

Residual Impacts on Landscape Resources with Mitigation Year10 (Sheet 3 of 4)

Figure 10.17d

Residual Impacts on Landscape Resources with Mitigation Year10 (Sheet 4 of 4)

Figure 10.20

Landscape Character Areas (Sheet 1 of 2)

Figure 10.21

Landscape Character Areas (Sheet 2 of 2)

Figure 10.22

Landscape Character Areas Photographs (Sheet 1 of 2)

Figure 10.23

Landscape Character Areas Photographs (Sheet 2 of 2)

Figure 10.24a

Residual Impacts on Landscape Character Areas (Sheet 1 of 2)

Figure 10.24b

Residual Impacts on Landscape Character Areas (Sheet 2 of 2)

Figure 10.30

Key Visual Elements and Photomontage Viewpoints

Figure 10.31

Zone of Visual Influence, Key VSRs and Photomontages Viewpoints (Sheet 1 of 4)

Figure 10.32

Zone of Visual Influence, Key VSRs and Photomontages Viewpoints (Sheet 2 of 4)

Figure 10.33

Zone of Visual Influence, Key VSRs and Photomontages Viewpoints (Sheet 3 of 4)

Figure 10.34

Zone of Visual Influence, Key VSRs and Photomontages Viewpoints (Sheet 4 of 4)

Figure 10.35

Photographs of VSRs (Sheet 1 of 6)

Figure 10.36

Photographs of VSRs (Sheet 2 of 6)

Figure 10.37

Photographs of VSRs (Sheet 3 of 6)

Figure 10.38

Photographs of VSRs (Sheet 4 of 6)

Figure 10.39a

Photographs of VSRs (Sheet 5 of 6)

Figure 10.39b

Photographs of VSRs (Sheet 6 of 6)

Figure 10.40a

Residual Impacts on VSRs with Mitigation Year10 (Sheet 1 of 4)

Figure 10.40b

Residual Impacts on VSRs with Mitigation Year10 (Sheet 2 of 4)

Figure 10.40c

Residual Impacts on VSRs with Mitigation Year10 (Sheet 3 of 4)

Figure 10.40d

Residual Impacts on VSRs with Mitigation Year10 (Sheet 4 of 4)

Figure 10.50a

Photomontages ¡V VP1 (Sheet 1 of 2)

Figure 10.50b

Photomontages ¡V VP1 (Sheet 2 of 2)

Figure 10.51a

Photomontages ¡V VP2 (Sheet 1 of 2)

Figure 10.51b

Photomontages ¡V VP2 (Sheet 2 of 2)

Figure 10.52a

Photomontages ¡V VP3 (Sheet 1 of 2)

Figure 10.52b

Photomontages ¡V VP3 (Sheet 2 of 2)

Figure 10.53a

Photomontages ¡V VP4 (Sheet 1 of 2)

Figure 10.53b

Photomontages ¡V VP4 (Sheet 2 of 2)

Figure 10.54a

Photomontages ¡V VP5 (Sheet 1 of 2)

Figure 10.54b

Photomontages ¡V VP5 (Sheet 2 of 2)

Figure 10.55a

Photomontages ¡V VP6 (Sheet 1 of 2)

Figure 10.55b

Photomontages ¡V VP6 (Sheet 2 of 2)

Figure 10.57a

Photomontages ¡V VP7 (Sheet 1 of 2)

Figure 10.57b

Photomontages ¡V VP7 (Sheet 2 of 2)

Figure 10.57c

Photomontages ¡V VP8 (Sheet 1 of 2)

Figure 10.57d

Photomontages ¡V VP8 (Sheet 2 of 2)

Figure 10.58a

Photomontages ¡V VP9 (Sheet 1 of 2)

Figure 10.58b

Photomontages ¡V VP9 (Sheet 2 of 2)

Figure 10.59a

Photomontages ¡V VP10 (Sheet 1 of 2)

Figure 10.59b

Photomontages ¡V VP10 (Sheet 2 of 2)

Figure 10.59c

Photomontages ¡V VP11 (Sheet 1 of 2)

Figure 10.59d

Photomontages ¡V VP11 (Sheet 2 of 2)

Figure 10.60a

Landscape & Visual Mitigation Measures Plan (Sheet 1 of 2)

Figure 10.60b

Landscape & Visual Mitigation Measures Plan (Sheet 2 of 2)

Figure 10.61A

Barrage Mitigation ¡V Plan

Figure 10.61B

Barrage Mitigation ¡V Elevation A - Northwest

Figure 10.61C

Barrage Mitigation ¡V Elevation B - Southwest

Figure 10.61D

Barrage Mitigation ¡V Elevation C - Northeast

Figure 10.70

Landscape Resources ¡V Existing & Affected Trees (Sheet 1 of 4)

Figure 10.71

Landscape Resources ¡V Existing & Affected Trees (Sheet 2 of 4)

Figure 10.72

Landscape Resources ¡V Existing & Affected Trees (Sheet 3 of 4)

Figure 10.73

Landscape Resources ¡V Existing & Affected Trees (Sheet 4 of 4)

Figure 10.80

Typical Nullah Mitigation ¡VSection A

Figure 10.81

Typical Nullah Mitigation ¡VSection B

Figure 10.82

Typical Nullah Mitigation ¡VSection C

Figure 10.83

Typical Nullah Mitigation ¡VSection D

Figure 10.90

Typical Vertical Greening Detail