Chapter Title Page
1. Introduction 1-1
1.1 Background 1-1
1.2 Purpose of the
EIA Report 1-1
1.3 Scope and
Objectives of the EIA Study 1-1
1.4 Documents
Reviewed 1-3
2. Project
Description 2-1
2.1 Project
Background 2-1
2.2 Project
Alignment 2-1
2.3 Scope of the
Project 2-2
2.4 Relationship between the existing cross-harbour
gas pipelines and pigging stations and the proposed gas pipelines and pigging
stations 2-3
2.5 Do-nothing
Scenario 2-3
2.6 Consideration
of Alternative Alignment Options 2-4
2.7 Consideration
of Alternative Pigging Stations Locations/Designs 2-5
2.8 Consideration
of Alternative Construction Methods 2-10
2.9 Selection of
the Preferred Option 2-15
2.10 Tentative
Project Programme 2-15
2.11 Concurrent
Projects 2-15
3. Water
Quality Impact Assessment 3-1
3.1 Introduction 3-1
3.2 Environmental Legislation, Standards, Guidelines
and Criteria 3-1
3.3 Description of the Environment 3-7
3.4 Water Sensitive Receivers 3-19
3.5 Assessment Methodology 3-19
3.6 Identification of Environmental Impact 3-28
3.7 Prediction and Evaluation of Environmental
Impacts 3-33
3.8 Mitigation of Adverse Environmental Impact 3-78
3.9 Evaluation of Residual Impacts 3-80
3.10 Environmental Monitoring and Audit 3-82
3.11 Summary 3-82
4. Waste
Management Impact Assessment 4-1
4.1 Introduction 4-1
4.2 Environmental Legislation, Standards, Guidelines
and Criteria 4-1
4.3 Assessment Methodology 4-3
4.4 Baseline Condition of Marine Dredged Sediment 4-9
4.5 Identification and Evaluation of Environmental
Impacts 4-18
4.6 Mitigation of Adverse Environmental Impacts 4-20
4.7 Evaluation of Residual Impacts 4-25
4.8 Environmental Monitoring and Audit 4-25
4.9 Summary 4-25
5. Marine
Ecological Impact Assessment 5-1
5.1 Introduction 5-1
5.2 Environmental Legislation, Standards, Guidelines
and Criteria 5-1
5.3 Assessment Methodology 5-3
5.4 Baseline Conditions & Marine Ecological
Sensitive Receivers 5-4
5.5 Ecological Importance 5-12
5.6 Identification, Prediction and Evaluation of
Environmental Impacts 5-16
5.7 Mitigation of Adverse Environmental Impact 5-21
5.8 Cumulative Impact 5-23
5.9 Evaluation of Residual Impacts 5-24
5.10 Environmental Monitoring and Audit 5-24
5.11 Summary 5-24
5.12 References 5-25
6. Fisheries
Impact Assessment 6-1
6.1 Introduction 6-1
6.2 Environmental Legislation, Standards, Guidelines
and Criteria 6-1
6.3 Fisheries Impact Assessment Methodology 6-1
6.4 Baseline Conditions 6-2
6.5 Identification of Fisheries Impacts 6-3
6.6 Assessment of Fisheries Impacts 6-6
6.7 Mitigation of Adverse Environmental Impacts 6-8
6.8 Evaluation of Residual Fisheries Impacts 6-8
6.9 Evaluation of Cumulative Fisheries Impacts 6-8
6.10 Environmental Monitoring and Audit 6-9
6.11 Summary 6-10
6.12 Reference 6-10
7. Hazard
to Life 7-1
7. Hazard
to Life 7-1
7.1 Introduction 7-1
7.2 Approach and Methodology 7-1
7.3 Applicable Regulations 7-2
7.4 Design Description and Review 7-2
7.5 Hazard Identification 7-4
7.6 Risk Assessment 7-8
7.7 Summary 7-11
8. Landscape
Impact Assessment 8-1
8.1 Introduction 8-1
8.2 Environmental Legislation, Standards, Guidelines
and Criteria 8-1
8.3 Assessment Methodology 8-2
8.4 Baseline Study 8-5
8.5 Landscape Impact Assessment 8-6
8.6 Environmental Monitoring and Audit 8-11
8.7 Summary 8-11
9. Cultural
Heritage Impact Assessment 9-1
9.1 Introduction 9-1
9.2 Environmental Legislation, Standards, Guidelines
and Criteria 9-1
9.3 Cultural Heritage Impact Assessment Methodology 9-3
9.4 Baseline Conditions 9-3
9.5 Identification of Cultural Heritage Impact 9-4
9.6 Assessment of Cultural Heritage Impact 9-4
9.7 Mitigation of Adverse Environmental Impact 9-4
9.8 Evaluation of Residual Cultural Heritage Impact 9-4
9.9 Environmental Monitoring and Audit 9-4
9.10 Summary 9-4
10. Noise
Impact Assessment 10-1
10.1 Introduction 10-1
10.2 Relevant Legislation, Standards & Guidelines 10-1
10.3 Study Area 10-3
10.4 Noise Sensitive Uses 10-3
10.5 Assessment Approach & Methodology 10-4
10.6 Analysis of Construction Activities and Sources of
Noise Impact 10-5
10.7 Possible Noise Mitigation Measures and Mitigated
Impacts 10-10
10.8 Potential Concurrent Projects 10-13
10.9 Evaluation of Residual Impacts 10-13
10.10 Environmental Monitoring and Audit (EM&A)
Requirements 10-13
10.11 Summary 10-13
11. Construction
Dust Impact Assessment 11-1
11.1 Introduction 11-1
11.2 Relevant Legislation, Standards & Guidelines 11-1
11.3 Study Area and Air Sensitive Uses 11-2
11.4 Background Air Quality 11-3
11.5 Construction Phase Impacts 11-4
11.6 Potential Cumulative Impacts due to Concurrent Works 11-6
11.7 Operational Phase Impacts 11-6
11.8 Environmental Monitoring and Audit Requirements 11-6
11.9 Summary 11-6
12. Environmental
Monitoring and Audit (EM&A) Requirements 12-1
12.1 Water Quality 12-1
12.2 Waste Management 12-1
12.3 Marine Ecology 12-1
12.4 Fisheries 12-1
12.5 Hazard to Life 12-1
12.6 Landscape 12-2
12.7 Cultural Heritage 12-2
12.8 Noise 12-2
12.9 Construction Dust 12-2
13. Impact
Summary 13-1
13.1 Water Quality 13-1
13.2 Waste Management 13-1
13.3 Marine Ecology 13-1
13.4 Fisheries 13-2
13.5 Hazard to Life 13-2
13.6 Landscape 13-3
13.7 Cultural Heritage 13-3
13.8 Noise 13-3
13.9 Construction Dust 13-4
13.10 Overall Summary 13-5
14. Implementation
Schedule 14-1
15. Summary
of Environmental Outcomes 15-1
15.1 Population and Environmental Sensitive Areas
Protected 15-1
15.2 Environmental Friendly Designs Recommended and
Problems Avoided 15-1
15.3 Environmental Benefits of the Project 15-2
Tables
Table 3.1: Summary of Water
Quality Objectives for Victoria
Harbour WCZ 3-2
Table 3.2: Summary of Water
Quality Objectives for Western Buffer WCZ 3-3
Table 3.3: Summary of Water
Quality Objectives for Eastern Buffer WCZ 3-4
Table 3.4: WSD’s Water Quality
Criteria for Flushing Water at Sea Water Intakes 3-5
Table 3.5: Marine Water Quality
in Victoria Harbour Water Control Zone at Selected Stations in 2007 3-8
Table 3.6: Marine Water Quality
in Eastern and Western Buffer Water Control Zones at Selected Stations in
2007 3-10
Table 3.7: Marine Water Quality
in Victoria Harbour Water Control Zone at Selected Stations in 2008 3-12
Table 3.8: Marine Water Quality
in Eastern and Western Buffer Water Control Zones at Selected Stations in
2008 3-14
Table 3.9: Marine Water Quality
at To Kwa Wan and Shau Kei Wan Typhoon Shelters in 2007 3-16
Table 3.10: Bottom Sediment
Quality at Selected Stations in 2003 – 2007 3-18
Table 3.11: Summary of Parameters
for Sediment Plume Model (Delft3D-WAQ) 3-21
Table 3.12: Sediment Quality near
the Dredging Area 3-22
Table 3.13: Maximum Production
Rate for Scenario 1 3-25
Table 3.14: Maximum Production
Rates for Scenario 2 3-26
Table 3.15: Depth-averaged and
Surface SS levels near the Dredging Area 3-30
Table 3.16: DO, TIN and UIA
levels near the Dredging Area 3-31
Table 3.17: Specifications for
General Fill Material and Granular Fill Material 3-32
Table 3.18: Predicted Suspended Solids
Elevations at Marine Ecology and Fisheries Sensitive Receivers for Scenario 1A 3-34
Table 3.19: Predicted Suspended
Solids Elevations at Marine Ecology and Fisheries Sensitive Receivers for
Scenario 1B 3-35
Table 3.20: Predicted Suspended
Solids Elevations at Marine Ecology and Fisheries Sensitive Receivers for
Scenario 2A 3-36
Table 3.21: Predicted Suspended
Solids Elevations at Marine Ecology and Fisheries Sensitive Receivers for
Scenario 2B 3-37
Table 3.22: Predicted Suspended
Solids Concentrations at Cooling and Sea Water Intakes for Scenario 1A 3-38
Table 3.23: Predicted Suspended
Solids Concentrations at Cooling and Sea Water Intakes for Scenario 1B 3-39
Table 3.24: Predicted Suspended
Solids Concentrations at Cooling and Sea Water Intakes for Scenario 2A 3-40
Table 3.25: Predicted Suspended
Solids Concentrations at Cooling and Sea Water Intakes for Scenario 2B 3-42
Table 3.26: Predicted Dissolved
Oxygen Concentrations for Scenario 1A 3-45
Table 3.27: Predicted Total
Inorganic Nitrogen and Unionised Ammonia Concentrations for Scenario 1A 3-48
Table 3.28: Predicted Dissolved
Oxygen Concentrations for Scenario 1B 3-51
Table 3.29: Predicted Total
Inorganic Nitrogen and Unionised Ammonia Concentrations for Scenario 1B 3-54
Table 3.30: Predicted Dissolved
Oxygen Concentrations for Scenario 2A 3-58
Table 3.31: Predicted Total
Inorganic Nitrogen and Unionised Ammonia Concentrations for Scenario 2A 3-61
Table 3.32: Predicted Dissolved
Oxygen Concentrations for Scenario 2B 3-64
Table 3.33: Predicted Total Inorganic
Nitrogen and Unionised Ammonia Concentrations for Scenario 2B 3-67
Table 3.34: Comparison of Marine
Sediment Elutriate Test Results with Water Quality Standards 3-72
Table 4.1: Coordinates, Type
and Depth of Vibrocores 4-4
Table 4.2: Sample Arrangement
for Chemical Testing 4-5
Table 4.3: Testing Methods and
Reporting Limits for Metals and Metalloids Analysis 4-6
Table 4.4: Testing Methods and
Reporting Limits for TBT, PAHs and PCBs Analysis 4-6
Table 4.5: Sediment Quality
Criteria for the Classification of Sediment 4-7
Table 4.6: Composite Sample
Arrangement for Biological Testing 4-8
Table 4.7: Test Species for
Biological Testing 4-8
Table 4.8: Test endpoints and
decision criteria for biological testing 4-9
Table 4.9: Contaminant Levels
of Vibrocore Samples and Their Categories 4-11
Table 4.10: Summary of
Classification of Vibrocore Samples 4-17
Table 4.11: Summary of Ancillary
Tests Results 4-17
Table 4.12: Summary of Toxicity
Test Failure 4-18
Table 4.13: Summary of Waste
Handling Procedures and Disposal Routes 4-24
Table 5.1: Evaluation of the
Ecological Importance of the Inter-tidal Habitats in Victoria Harbour WCZ 5-13
Table 5.2: Evaluation of the
Ecological Importance of the Marine Benthic Habitat in Victoria Harbour WCZ 5-13
Table 5.3: Evaluation of the
Ecological Importance of the Sub-tidal Habitats 5-14
Table 5.4: Evaluation of the
Ecological Importance of the Marine Waters 5-15
Table 5.5: Evaluating hard
coral species found in the Study Area 5-15
Table 5.6: Evaluation of the
Significance of Ecological Impact 5-19
Table 5.7: Summary of Potential
Ecological Impacts on Coral Communities after Mitigation 5-22
Table 6.1: Evaluation of
Potential Fisheries Impacts during Construction Phase 6-6
Table 6.2: Evaluation of
Potential Fisheries Impacts during Operation Phase 6-8
Table 7.1: 5x5 Risk Assessment
Matrix 7-8
Table 7.2: Consequence
Evaluation Criteria 7-8
Table 7.3: Likelihood
Evaluation Criteria 7-9
Table 7.4: Risk Assessment of
Different Failure Causes of the Underground Pipelines during Operation 7-9
Table 7.5: Risk Assessment of
Different Failure Causes of the Submarine Pipelines during Operation 7-10
Table 8.1: Relationship between
Receptor Sensitivity and Impact Magnitude in Defining Impact Significance 8-4
Table 8.2: Proposed Construction
Phase Landscape and Visual Mitigation Measures 8-7
Table 8.3: Operation Phase
Landscape and Visual Mitigation Measures 8-8
Table 8.4: Significance of
Landscape Impacts in Construction and Operation Phases (Negative Impacts unless
otherwise stated) 8-10
Table 10.1 Noise Standards for Daytime
Construction Activities 10-1
Table 10.2 Basic Noise Levels
(BNL, Leq dB(A)) 10-2
Table 10.3 Locations of the
Existing Representative NSRs for CNIA 10-4
Table 10.4 Tentative
Construction Activities and Construction Plant List for Submarine Works 10-5
Table 10.5 Tentative
Construction Activities and Construction Plant List for Landmain Works 10-6
Table 10.6 Unmitigated Noise
Impact due to the Laying of Submarine Gas Main 10-7
Table 10.7 Unmitigated Noise
Impact due to Landfall Site Construction 10-8
Table 10.8 Unmitigated Noise
Impact due to the Construction of Pigging Station 10-8
Table 10.9 Cumulative Construction
Noise Impact (Unmitigated) 10-9
Table 10.10 Total Maximum
Allowable Sound Power Level (SWL) for Test before Backfilling and Hydrostatic/
Commissioning Test during Construction Phase 10-10
Table 10.11 Recommended Quiet PME
and the SWL 10-10
Table 10.12 Maximum SWLs of Plant
Inventory with Mitigation Measures Implemented 10-11
Table 10.13 Mitigated Noise Impact
due to the Landfall Site Construction 10-11
Table 10.14 Cumulative Construction
Noise Impact (Mitigated) 10-12
Table 11.1: Hong Kong Air Quality
Objectives 11-1
Table 11.2: Representative ASRs
within the Assessment Area 11-3
Table 11.3: 5-year-averaged Background
Air Quality of Kwun Tong and Eastern Air Quality Monitoring Stations 11-3
Table 11.4 Construction
Activities and Potential Emission Sources 11-4
List of Figures
Figure 1.1 General Layout
Figure 2.1 Physical Constraints to the Proposed Submarine
Gas Pipelines
Figure 2.2 Typical Cross Section of the Pipelines
Trench
Figure 2.3 Horizontal Alignment of the Proposed
Submarine Gas Pipelines
Figure 2.4 Proposed Submarine Gas Pipelines
Alignment Options
Figure 2.5 To Kwa Wan Pigging Station Options 1 to 7
(see Section 2.7 of main text)
Figure 2.6 To Kwa Wan Pigging Station Options 8 to
13 (see Section 2.7 of main text)
Figure 2.7 North Point Pigging Station Options 1 to
9 (see Section 2.7 of main text)
Figure 2.8 North Point Pigging Station Options 10 to
17 (see Section 2.7 of main text)
Figure 2.9 Proposed Conceptual Layout of To Kwa Wan Pigging Station
Figure 2.10 Conceptual Section Illustration (aboveground only) of Proposed
To Kwa Wan Pigging Station
Figure 2.11 Proposed Conceptual Layout of North Point Pigging Station
Figure 2.12 Conceptual Section Illustration (aboveground only) of Proposed
North Point Pigging Station
Figure 3.1 Study
Area for Water Quality Impact Assessment
Figure
3.2 Locations of Water Quality
Sensitive Receivers
Figure
3.3 Extent of the Western Harbour
Model Grid
Figure
3.4 Details of the Western Harbour
Model Grid in the Project Area
Figure
3.5 Resolution of the Western
Harbour Model Grid
Figure 3.6a Grid Refinement of the Western Harbour
Model Grid
Figure 3.6b Grid Refinement at the Project Area
Figure 3.7a Coastline Configuration in the Model
Figure 3.7b Coastline Configuration in the Victoria
Harbour
Figure 3.8a Bathymetry in the Project Area
Figure 3.8b Bathymetry in the Victoria Harbour
Figure 3.9 Location of Sediment Source
Figure 3.10 Layout
and Typical Configuration of Silt Curtain
Figure 4.1 Location of Vibrocores
Figure 4.2 Sediment Classification Plan
Figure 5.1 Study Area for Marine Ecological Impact Assessment and Ecological
Sensitive Receivers
Figure 5.2a Survey
Locations in Literature (Sheet 1 of 2)
Figure 5.2b Survey Locations in Literature (Sheet 2 of 2)
Figure 5.3 Locations for Ecological Dive Survey and Intertidal Survey
Figure 5.4 Habitat Map
Figure 5.5 Representative Intertidal Habitats
Figure 5.6 Mitigation Measures for Hard Coral Colonies at To Kwa Wan
Breakwaters
Figure 7.1 Preliminary
Layout Plan of the Proposed Pigging Station at To Kwa Wan
Figure 7.2 Preliminary Layout Plan of the Proposed Pigging Station at North
Point
Figure
7.3 Societal Risk at To Kwa Wan
Figure
7.4 Societal Risk at North Point
Figure
7.5 Societal Risk of the Submarine Pipeline
Figure 8.1 Assessment Area of Landscape Impact
Assessment (1)
Figure 8.2 Assessment Area of Landscape Impact
Assessment (2)
Figure 8.3 Landscape Resources (1)
Figure 8.4 Landscape Resources (2)
Figure 8.5 Landscape Character Areas (Plan) (1)
Figure 8.6 Landscape Character Areas (Plan) (2)
Figure 8.7a Photo-views of Landscape Character Areas
(1)
Figure 8.7b Photo-views of Landscape Character Areas
(2)
Figure 8.8 Residual Impacts on Landscape Resources
During Construction Phase
Figure 8.9 Residual Impacts on Landscape Resources
During Operation Phase
Figure 8.10 Residual Impacts on Landscape Character
Areas During Construction Phase
Figure 8.11 Residual Impacts on Landscape Character
Areas During Operation Phase
Figure 8.12 General Landscape Plan for Pigging Station
at To Kwa Wan
Figure 8.13 General Landscape Plan for Pigging Station
at North Point
Figure 8.14 Photomontages
for Pigging Station at To Kwa Wan (1)
Figure 8.15 Photomontages
for Pigging Station at To Kwa Wan (2)
Figure 8.16 Photomontages
for Pigging Station at To Kwa Wan (3)
Figure 8.17 Photomontages
for Pigging Station at To Kwa Wan (4)
Figure 8.18 Photomontages
for Pigging Station at North Point (1)
Figure 8.19 Photomontages
for Pigging Station at North Point (2)
Figure 8.20 Photomontages
for Pigging Station at North Point (3)
Figure 10.1 Assessment Area of Construction Noise
Impact Assessment
Figure 10.2 Representative Noise Sensitive Receivers
(NSRs) (To Kwa Wan)
Figure 10.3 Representative Noise Sensitive Receivers
(NSRs) (North Point)
Figure 10.4 Photos of Existing Noise Sensitive
Receivers
Figure 10.5 Tentative Plan for Pipe Laying Operation
Figure 11.1 Assessment Area of Air Quality Impact
Assessment
Figure 11.2 Representative Air Sensitive Receivers
(ASRs) (To Kwa Wan)
Figure 11.3 Representative
Air Sensitive Receivers (ASRs) (North Point)
List
of Appendices
Appendix
A1 Tentative Project Programme
Appendix A2 Concurrent Project Programme
Appendix B1 Model Verification and Spin-up Plots
Appendix B2 Sediment Plume Model Results – Scenario 1 Dry Season
Appendix B3 Sediment Plume Model Results – Scenario 1 Wet Season
Appendix B4 Sediment Plume Model Results – Scenario 2 Dry Season
Appendix B5 Sediment Plume Model Results – Scenario 2 Wet Season
Appendix B6 Laboratory Test Report on Elutriate Tests
Appendix B7 Plots for Conservative Tracer
Appendix B8 Ambient SS, DO, TIN and UIA Levels at EPD’s Water Quality
Monitoring Stations
Appendix C1 Vibrocore Records
Appendix C2 Laboratory Test Report on Chemical Screening
Appendix C3 Laboratory Test Report on Biological Screening
Appendix C4 MFC’s Initial Consensus on giving
the Disposal Allocation
Appendix D1 Marine Ecological Data
Appendix D2 Marine Ecological Dive Survey Report
Appendix
E (Not Used)
Appendix F1 The Land Use, Description and Location
of the Population Groups near the Proposed Gas Pigging Station in Operation
Year 2012
Appendix F2 Pigging Operation and the PIG
Appendix
F3 Hazard to Life Assessment of Gas
Pigging Stations
Appendix
G (Not Used)
Appendix H1 Marine Archaeological
Investigation Report
Appendix
H2 Marine Archaeological Monitoring
Brief
Appendix I1 Letter from Education Bureau
Appendix I2 Unmitigated Construction Noise Levels
Appendix I3 Mitigated Construction Noise Levels
Appendix I4 Further Mitigated Construction Noise Levels
Appendix I5 Cumulative Construction Noise Impact
Appendix J (Not
Used)
Appendix K Key Assessment Assumptions and Methodologies
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