Table of Contents

1. INTRODUCTION

1.1 Project Background

1.2 Background to this EIA

1.3 Purpose and Approach of the EIA Study

1.4 Structure of this EIA Study Report

2. PROJECT DESCRIPTION

2.1 Location and Description of the Project

2.2 Need of the Project

2.3 Scenarios With and Without the Projects

2.4 Consideration of Alternative Design and Layout of Proposed Tai O STW

2.5 Consideration of Alternative Construction Methods and Sequences of Work for Tai O STW

2.6 Design of Submarine Sewage Outfall

2.7 Consideration of Alternative Construction Methods and Sequences of Work for Tai O submarine outfall

2.8 Alternative Sewage Treatment Process

2.9 Selection of Preferred Scheme

2.10 Effluent Reuse

2.11 Measures for Effluent Reuse to avoid Potential Health Impacts

2.12 Consideration of Alternative Site Location of Proposed Hang Mei SPS

2.13 Consideration of Alternative Site Location of Proposed Fan Kwai Tong SPS

2.14 Project Tentative Implementation Programme

2.15 Public Consultations

2.16 Project Interface / Concurrent Projects

3. AIR QUALITY

3.1 Introduction

3.2 Relevant Legislations, Standards & Guidelines

3.3 Baseline Environmental Conditions

3.4 Air Sensitive Receivers

3.5 Impact Assessment - Construction Phase

3.6 Construction Dust Impact Assessment Methodology

3.7 Prediction of Construction Dust Impact

3.8 Odour Assessment Methodology

3.9 Prediction of Odour Impact

3.10 Mitigation Measures

3.11 Environmental Monitoring and Audit Requirements

3.12 Conclusion

4. NOISE

4.1 Introduction

4.2 Relevant Legislations, Standards & Guidelines

4.3 Description of the Existing Noise Environment

4.4 Construction Noise Impact Assessment

4.5 Operational Noise Impact Assessment

5. Water Quality Impact

5.1 Introduction

5.2 Relevant Legislations, Standards & Guidelines

5.3 Assessment Methodologies

5.4 Study Area and Water Sensitive Receivers

5.5 Baseline Water Quality Conditions and Trend

5.6 Water Quality Impact Assessment

5.7 Water Pollution Mitigation and Management

5.8 Cumulative Impacts

5.9 Evaluation of Residual Impacts

5.10 Environmental Monitoring and Audit Requirements

5.11 Conclusion

5.12 References

6. WASTE MANAGEMENT IMPLICATION

6.1 Introduction

6.2 Relevant Legislation Standards & Guidelines

6.3 Assessment Methodology

6.4 Waste Generation and Potential Impacts

6.5 Mitigation Measures

6.6 Residual Impacts

6.7 Environmental Monitoring and Audit Requirements

6.8 Conclusion

7. LAND CONTAMINATION

7.1 Introduction

7.2 Relevant Legislation, Standards & Guidelines

7.3 Assessment Methodology

7.4 Description of the Environment

7.5 Site History

7.6 Review of Environmental Information from the Government

7.7 Identification and Evaluation of Potential Impacts

7.8 Residual Impacts

7.9 Environmental Monitoring and Audit Requirements

7.10 Conclusions

8. ECOLOGY

8.1 Introduction

8.2 Relevant Legislation, Standards & Guidelines

8.3 Assessment Methodology

8.4 Description of Existing Ecological Baseline Conditions

8.5 Evaluation of Habitats and Species of Ecological Importance

8.6 Impact Identification

8.7 Impact Evaluation

8.8 Impact Avoidance and Mitigation Measures

8.9 Residual Impacts

8.10 Environmental Monitoring and Audit Requirements

8.11 Conclusions

8.12 References

9. FISHERIES

9.1 Introduction

9.2 Environmental Legislation, Standards & Guidelines

9.3 Methodology for Baseline Establishment

9.4 Assessment Methodology

9.5 Baseline Conditions

9.6 Impact Identification and Evaluation

9.7 Mitigation of Impacts

9.8 Residual Impacts

9.9 Environmental Monitoring and Audit

9.10 Conclusion

9.11 References

10. Cultural heritage

10.1 Introduction

10.2 Relevant Legislations, Standards & Guidelines

10.3 Study Area and Sensitive Receivers

10.4 Evaluation of Potential Impacts

10.5 Mitigation Measures

10.6 Residual Environmental Impacts

10.7 Environmental Monitoring and Audit

10.8 Conclusion

10.9 References

11.  Landscape & Visual Impact

11.1 Introduction

11.2 Project Summary

11.3 Review of Planning and Development Control Framework

11.4 Relevant Legislations, Standards & Guidelines

11.5 Landscape and Visual Impact Assessment Methodology

11.6 Existing Landscape and Visual Baseline

11.7 Landscape and Visual Impact Assessment

11.8 Recommended Mitigation Measures

11.9 Residual Landscape and Visual Impacts

11.10 Conclusion

12. ENVIRONMENTAL MONITORING AND AUDIT REQUIREMENTS

12.1 Introduction

12.2 Air Quality

12.3 Noise

12.4 Water Quality

12.5 Waste Management

12.6 Land Contamination

12.7 Ecology

12.8 Fisheries

12.9 Cultural Heritage

12.10 Landscape and Visual

13. Implementation Schedule of Mitigation Measures

13.1 Introduction

14.  Summary Of Environmental Outcomes And Overall Conclusion

14.1 Project Summary

14.2 Key Environmental Outcomes

14.3 Overall Conclusions

List of Appendices

Appendix 2.1 Approved Tai O Fringe Outline Zoning Plan No. S/I-TOF/2

Appendix 2.2 Tai O Sewage Treatment Works Construction Sequence

Appendix 3.1 Odour Survey Methodology, Locations and Survey Results

Appendix 3.2 Dust Emission Factor

Appendix 3.3 Odour Emission Factor

Appendix 3.4 List of Correspondences

Appendix 3.5 PATH Concentration

Appendix 3.6 Concurrent Project Locations

Appendix 4.1 Construction Plant Inventory – Unmitigated Scenario

Appendix 4.2 Photographs of Representative NSRs

Appendix 4.3 Detailed Calculation of Construction Noise Levels at Representative NSRs - Unmitigated Scenario

Appendix 4.4 Construction Plant Inventory - Mitigated Scenario

Appendix 4.5 Detailed Calculation of Construction Noise Levels at Representative NSRs - Mitigated Scenario

Appendix 4.6 Construction Plant Inventory - Further Mitigated Scenario

Appendix 4.7 Detailed Calculation of Construction Noise Levels at Representative NSRs - Mitigated Scenario - Level 1 + 3 Mitigation Measures

Appendix 4.8 Detailed Calculation of Operation Noise Levels - Unmitigated Scenario

Appendix 4.9 Detailed Calculation of Operation Noise Levels - Mitigated Scenario

Appendix 5.1 Laboratory Testing Results from Elutriate Test

Appendix 5.2 Details on Hydrodynamic and Water Quality Modelling

Appendix 5.3 Simulation Results of the release of Suspended Sediment

Appendix 5.4 Time-series Comparison of Magnitude and Direction of Tidal Flow

Appendix 5.5 Contour Plots of Simulated Parameters

Appendix 5.6 Time-series Comparisons of Simulated Water Quality Concentrations

Appendix 5.7 Contour Plots Comparison of Key Water Quality Indicators

Appendix 6.1 Endorsed Sediment Sampling and Testing Plan

Appendix 6.2 Laboratory Report of Sediment Sampling

Appendix 6.3 Laboratory Report of Biological Tests

Appendix 6.4 Correspondence from Marine Fill Committee

Appendix 7.1 Correspondences with Government Department for Potential Land Contamination Sites - EPD

Appendix 7.2 Correspondences with Government Department for Potential Land Contamination Sites – FSD

Appendix 7.3 Location Plan of Site Photography

Appendix 8.1 Ecological Baseline Survey Report – Terrestrial

Appendix 8.1a Summary of Verification Survey

Appendix 8.2 Ecological Baseline Survey Report – Marine

Appendix 10.1 Methodology and Result of Marine Archaeological Review

Appendix 10.2 Visual Diver Survey Report

Appendix 10.3 Built Heritage Catalogue

Appendix 10.4 Methodology for Archaeological Watching Brief

Appendix 10.5 Cross Reference Checklist for Tai O

Appendix 11.1 Existing Trees Conditions and Tree Schedule for the Trees at the Development Site Extracted from the Tree Survey Report under “Agreement No. CE 31/2007(DS) Upgrading of Cheung Chau and Tai O Sewage Collection, Treatment and Disposal Facilities – Investigation”

Appendix 11.2 Conceptual Landscape Mitigation Plans

Appendix 11.3 Existing Site Photos for Proposed Sewers Works

Appendix 11.4 Typical Photos of Visual Screen/Hoarding

Appendix 11.5 Additional Viewpoints for Tai O STW and Hang Mei SPS

Appendix 11.6 Proposed Works in Tai O and Outline Zoning Plan

List of Figures

Figure 2.1	Proposed Works in Tai O
Figure 2.1A	Proposed Works near Nam Chung Tsuen in Tai O
Figure 2.2	Tai O Sewage Treatment Works General Layout - Option 1 - Modified Original Location of Tai O STW
Figure 2.3	Schematic Flow Diagram of Upgraded Tai O STW
Figure 2.4	Hang Mei Sewage Pumping Station General Layout
Figure 2.5	Fan Kwai Tong Sewage Pumping Station General Layout
Figure 2.6	Option 2 - Alternative Location at St. Stephen's Tai O Family
Figure 2.7	Option 3 - Alternative Location at North of St. Stephen's Tai O Family
Figure 2.8	Option 4 - Alternative Arrangement of Tai O STW - Split Option A
Figure 2.9	Option 5 - Alternative Arrangement of Tai O STW - Split Option B
Figure 2.10	Option 6 - Alternative Site Formation Method of Tai O STW - Cavern
Figure 2.11	Option 7 - Alternative Site Formation Method of Tai O STW - Platform Deck
Figure 2.12	Options for Hang Mei SPS Site
Figure 2.13	Options for Fan Kwai Tong SPS Site
Figure 3.0	Air Sensitive Receivers Key Plan
Figure 3.1	Air Sensitive Receivers (Sheet 1 of 14)
Figure 3.2	Air Sensitive Receivers (Sheet 2 of 14)
Figure 3.3	Air Sensitive Receivers (Sheet 3 of 14)
Figure 3.4	Air Sensitive Receivers (Sheet 4 of 14)
Figure 3.5	Air Sensitive Receivers (Sheet 5 of 14)
Figure 3.6	Air Sensitive Receivers (Sheet 6 of 14)
Figure 3.7	Air Sensitive Receivers (Sheet 7 of 14)
Figure 3.8	Air Sensitive Receivers (Sheet 8 of 14)
Figure 3.9	Air Sensitive Receivers (Sheet 9 of 14)
Figure 3.10	Air Sensitive Receivers (Sheet 10 of 14)
Figure 3.11	Air Sensitive Receivers (Sheet 11 of 14)
Figure 3.12	Air Sensitive Receivers (Sheet 12 of 14)
Figure 3.13	Air Sensitive Receivers (Sheet 13 of 14)
Figure 3.14	Air Sensitive Receivers (Sheet 14 of 14)
Figure 3.15	Contour Plot of Maximum 1-Hour TSP Concentration in μg/m^3 at 1.5m above ground (Unmitigated)
Figure 3.16	Contour Plot of 10^th Maximum 24-hour RSP Concentration in μg/m^3 at 1.5m above ground (Unmitigated)
Figure 3.17	Contour Plot of 10^th Maximum 24-hour FSP Concentration in μg/m^3 at 1.5m above ground (Unmitigated)
Figure 3.18	Contour Plot of Annual RSP Concentration in μg/m^3at 1.5m above ground (Unmitigated)
Figure 3.19	Contour Plot of Annual FSP Concentration in μg/m^3 at 1.5m above ground (Unmitigated)
Figure 3.20	Contour Plot of Maximum 1-hour TSP Concentration in μg/m^3 at 1.5m above ground (Mitigated)
Figure 3.21	Contour Plot of 10^th Maximum 24-hour RSP Concentration in μg/m^3 at 1.5m above ground (Mitigated)
Figure 3.22	Contour Plot of 10^th Maximum 24-hour FSP Concentration in μg/m^3 at 1.5m above ground (Mitigated)
Figure 3.23	Contour Plot of Annual RSP Concentration in μg/m^3 at 1.5m above ground (Mitigated)
Figure 3.24	Contour Plot of Annual FSP Concentration in μg/m^3 at 1.5m above ground (Mitigated)
Figure 3.25	Contour Plot of 5-second Odour concentration in OU unit at 1.5m above ground during construction phase (Mitigated)
Figure 3.26	Contour Plot of 5-second Odour concentration in OU unit at 1.5m above ground during operational phase (Unmitigated)
Figure 3.27	Contour Plot of 5-second Odour concentration in OU unit at 5m above ground during operational phase (Unmitigated)
Figure 3.28	Contour Plot of 5-second Odour concentration in OU unit at 10m above ground during operational phase (Unmitigated)
Figure 3.29	Contour Plot of 5-second Odour concentration in OU unit at 15m above ground during operational phase (Unmitigated)
Figure 3.30	Contour Plot of 5-second Odour concentration in OU unit at 1.5m above ground during operational phase (Mitigated)
Figure 3.31	Contour Plot of 5-second Odour concentration in OU unit at 5m above ground during operational phase (Mitigated)
Figure 3.32	Contour Plot of 5-second Odour concentration in OU unit at 10m above ground during operational phase (Mitigated)
Figure 3.33	Contour Plot of 5-second Odour concentration in OU unit at 15m above ground during operational phase (Mitigated)
Figure 4.0	Noise Sensitive Receivers Key Plan
Figure 4.1	Noise Sensitive Receivers (Sheet 1 of 11)
Figure 4.2	Noise Sensitive Receivers (Sheet 2 of 11)
Figure 4.3	Noise Sensitive Receivers (Sheet 3 of 11)
Figure 4.4	Noise Sensitive Receivers (Sheet 4 of 11)
Figure 4.5	Noise Sensitive Receivers (Sheet 5 of 11)
Figure 4.6	Noise Sensitive Receivers (Sheet 6 of 11)
Figure 4.7	Noise Sensitive Receivers (Sheet 7 of 11)
Figure 4.8	Noise Sensitive Receivers (Sheet 8 of 11)
Figure 4.9	Noise Sensitive Receivers (Sheet 9 of 11)
Figure 4.10	Noise Sensitive Receivers (Sheet 10 of 11)
Figure 4.11	Noise Sensitive Receivers (Sheet 11 of 11)
Figure 4.12	Tai O Sewage Treatment Works Location of Operational Fixed Plant Noise Source
Figure 4.13	Fan Kwai Tong Sewage Pumping Station Location of Operational Fixed Plant Noise Source
Figure 4.14	Hang Mei Sewage Pumping Station Location of Operational Fixed Plant Noise Source
Figure 5.1	Water Sensitive Receivers
Figure 5.2a	WSRs in Tai O Area
Figure 5.2b	WQ Assessment Points
Figure 5.3	WQ Monitoring Locations
Figure 5.4	Elutriate Test Sampling Location
Figure 6.1	Spatial and Vertical Extent of Marine Sediments Requiring Disposal
Figure 7.1	Year 1945 Aerial Photo Photo No: 3092
Figure 7.2	Year 1972 Aerial Photo Photo No: 1512
Figure 7.3	Year 1978 Aerial Photo Photo No: 22996
Figure 7.4	Year 1980 Aerial Photo Photo No: 29189
Figure 7.5	Year 1994 Aerial Photo Photo No: CN9066
Figure 7.6	Year 2011 Aerial Photo Photo No: CS33835 & CS33828
Figure 7.7	Identified Chemical Waste Producer (Sheet 1 of 2)
Figure 7.8	Identified Chemical Waste Producer (Sheet 2 of 2)
Figure 7.9	Identified Dangerous Good Stores
Figure 7.10	Layout Plan of Existing Tai O Sewage Treatment Works
Figure 9.1	Assessment Area and Sites of Fisheries Importance
Figure 9.2	Marine-Based Project Location
Figure 9.3	Distribution of Adult Fish Production
Figure 9.4	Distribution of Fish Fry Production
Figure 9.5	Distribution of Fishing Operations
Figure 9.6	The Value of Fisheries Production
Figure 9.7	Zones for Culture Fisheries in Hong Kong
Figure 10.1	Location of Tai O Site of Archaeological Interest
Figure 10.2	Further Location of Tai O Site of Archaeological Interest (Outside Study Area)
Figure 10.3	Location of Tai O Fu Shan Site of Archaeological Interest
Figure 10.4	Study Area for the Marine Archaeological Investigation
Figure 10.5	Summary of Seabed Features and Magnetic Anomalies Plan
Figure 10.6	Location of Built Heritage Resources (Sheet 1 of 15)
Figure 10.7	Location of Built Heritage Resources (Sheet 2 of 15)
Figure 10.8	Location of Built Heritage Resources (Sheet 3 of 15)
Figure 10.9	Location of Built Heritage Resources (Sheet 4 of 15)
Figure 10.10	Location of Built Heritage Resources (Sheet 5 of 15)
Figure 10.11	Location of Built Heritage Resources (Sheet 6 of 15)
Figure 10.12	Location of Built Heritage Resources (Sheet 7 of 15)
Figure 10.13	Location of Built Heritage Resources (Sheet 8 of 15)
Figure 10.14	Location of Built Heritage Resources (Sheet 9 of 15)
Figure 10.15	Location of Built Heritage Resources (Sheet 10 of 15)
Figure 10.16	Location of Built Heritage Resources (Sheet 11 of 15)
Figure 10.17	Location of Built Heritage Resources (Sheet 12 of 15)
Figure 10.18	Location of Built Heritage Resources (Sheet 13 of 15)
Figure 10.19	Location of Built Heritage Resources (Sheet 14 of 15)
Figure 10.20	Location of Built Heritage Resources (Sheet 15 of 15)
Figure 10.21	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 1 of 15)
Figure 10.22	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 2 of 15)
Figure 10.23	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 3 of 15)
Figure 10.24	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 4 of 15)
Figure 10.25	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 5 of 15)
Figure 10.26	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 6 of 15)
Figure 10.27	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 7 of 15)
Figure 10.28	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 8 of 15)
Figure 10.29	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 9 of 15)
Figure 10.30	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 10 of 15)
Figure 10.31	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 11 of 15)
Figure 10.32	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 12 of 15)
Figure 10.33	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 13 of 15)
Figure 10.34	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 14 of 15)
Figure 10.35	Assessment of Terrestrial Archaeological Potential within Project in Tai O (Sheet 15 of 15)
Figure 11.1	Location of Landscape Resource Around Tai O STW
Figure 11.2	Location of Landscape Character Areas Around Tai O STW
Figure 11.3	Location of Visually Sensitive Receivers and Visual Envelop of Tai O STW
Figure 11.4	Location of Landscape Resource Around Hang Mei SPS
Figure 11.5	Location of Landscape Character Areas Around Hang Mei SPS
Figure 11.6	Location of Visually Sensitive Receivers and Visual Envelop of Hang Mei SPS
Figure 11.7	Location of Landscape Resource Around Fan Kwai Tong SPS
Figure 11.8	Location of Landscape Character Areas Around Fan Kwai Tong SPS
Figure 11.9	Location of Visually Sensitive Receivers and Visual Envelop of Fan Kwai Tong SPS
Figure 11.10	Photo of Landscape Resources and Landscape Character Areas (Sheet 1 of 5)
Figure 11.11	Photo of Landscape Resources and Landscape Character Areas (Sheet 2 of 5)
Figure 11.12	Photo of Landscape Resources and Landscape Character Areas (Sheet 3 of 5)
Figure 11.13	Photo of Landscape Resources and Landscape Character Areas (Sheet 4 of 5)
Figure 11.13A	Photo of Landscape Resources and Landscape Character Areas (Sheet 5 of 5)
Figure 11.14	Photo of Visually Sensitive Receivers (Sheet 1 of 2)
Figure 11.15	Photo of Visually Sensitive Receivers (Sheet 2 of 2)
Figure 11.16	Photomontage of the Proposed Tai O STW (View from VSR STW-1)
Figure 11.17	Photomontage of the Proposed Tai O STW (View from VSR STW-2)
Figure 11.18	Photomontage of the Proposed Hang Mei SPS (View from VSR HM-1)
Figure 11.19	Photomontage of the Proposed Hang Mei SPS (View from VSR HM-2)
Figure 11.20	Photomontage of the Proposed Hang Mei SPS (View from VSR HM-3)
Figure 11.21	Photomontage of the Proposed Fan Kwai Tong SPS (View from VSR FKT-1)
Figure 11.22	Photomontage of the Proposed Fan Kwai Tong SPS (View from VSR FKT-2)
Figure 11.23	Photomontage of the Proposed Fan Kwai Tong SPS (View from VSR FKT-3)
Figure 11.24	Landscape Impacts
Figure 11.25	Mitigation Plan for Tai O STW (Construction and Operation)
Figure 11.26	Mitigation Plan for Hang Mei SPS (Construction and Operation)
Figure 11.27	Mitigation Plan for Fan Kwai Tong SPS (Construction and Operation)
Figure 11.28	Mitigation Plan for Proposed Sewers Works (Construction)