Agreement No. CE 35/2006(CE)

Kai Tak Development Engineering Study

cum Design and Construction of Advance Works

– Investigation, Design and Construction

 

 

Dredging Works for Proposed Cruise Terminal at Kai Tak

Environmental Impact Assessment Report

 

 

Contents

 

 

1............ INTRODUCTION.

1.1        Project Background.

1.2        Purpose of this EIA Report

1.3        Objectives and Scope of the Schedule 2 EIA Study.

1.4        Relevant Approved EIA Reports.

1.5        Structure of this Report

2............ PROJECT DESCRIPTION. 7

2.1        Development of Cruise Terminal and Site Constraints. 7

2.2        The Need of Project and Scenario without the Project 9

2.3        Project Benefits. 9

2.4        Project Requirements. 10

2.5        Project Scope and Programme. 11

2.6        Consideration of Alternatives and Development of Preferred Option. 12

2.7        Siltation and Maintenance Dredging. 17

2.8        EIA Study Area. 19

2.9        Interaction with Other Projects. 20

3............ AIR QUALITY Impact. 23

3.1        Introduction. 23

3.2        Environmental Legislation, Policies, Plans, Standards and Criteria. 23

3.3        Description of the Environment 23

3.4        Air Quality Sensitive Receivers. 24

3.5        Identification, Prediction and Evaluation of Environmental Impacts. 25

3.6        Mitigation of Environmental Impacts. 26

3.7        Residual Environmental Impacts. 26

3.8        Environmental Monitoring and Audit 26

3.9        Summary. 27

4............ NOISE Impact. 29

4.1        Introduction. 29

4.2        Environmental Legislation, Policies, Plans, Standards and Criteria. 29

4.3        Project Description and Construction Activities. 29

4.4        Noise Sensitive Receivers. 30

4.5        Assessment Methodology. 30

4.6        Identification of Environmental Impacts. 31

4.7        Prediction and Evaluation of Environmental Impacts. 32

4.8        Evaluation of Residual Environmental Impacts. 32

4.9        Environmental Monitoring and Audit 33

4.10      Summary. 33

5............ WATER QUALITY Impact. 35

5.1        Introduction. 35

5.2        Water Quality Sensitive Receivers. 35

5.3        Environmental Legislation, Policies, Plans, Standards and Criteria. 35

5.4        Description of the Environment 41

5.5        Identification of Environmental Impacts. 49

5.6        Assessment Methodology. 50

5.7        Uncertainties in Assessment Methodology. 69

5.8        Prediction and Evaluation of Potential Environmental Impacts. 69

5.9        Mitigation of Environmental Impacts. 89

5.10      Evaluation of Residual Environmental Impacts. 101

5.11      Environmental Monitoring and Audit 101

5.12      Summary. 101

6............ WASTE MANAGEMENT Implications. 103

6.1        Introduction. 103

6.2        Environmental Legislation, Policies, Plans, Standards and Criteria. 103

6.3        Assessment Methodology. 104

6.4        Baseline Conditions. 108

6.5        Identification of Potential Sources of Environmental Impact 112

6.6        Prediction and Evaluation of Environmental Impacts. 113

6.7        Mitigation of Environmental Impacts. 116

6.8        Evaluation of Residual Environmental Impacts. 122

6.9        Environmental Audit 122

6.10      Summary. 122

7............ Impact on CULTURAL HERITAGE. 123

7.1        Introduction. 123

7.2        Environmental Legislation and Standards. 123

7.3        Assessment Methodology. 124

7.4        Results of Baseline Review. 125

7.5        Geophysical Survey. 125

7.6        Removal of Gas Main & Submarine Outfall and Relocation of GMBs & EQIA. 125

7.7        Evaluation of Heritage Significance of Seawall 126

7.8        Mitigation of Environmental Impacts. 126

7.9        Evaluation of Residual Environmental Impacts. 126

7.10      Environmental Monitoring and Audit 126

7.11      Summary. 126

8............ MARINE ECOLOGical IMpact. 129

8.1        Introduction. 129

8.2        Environmental Legislation, Policies, Plans, Standards and Criteria. 129

8.3        Assessment Methodology. 130

8.4        Description of the Environment 133

8.5        Identification of Environmental Impacts. 143

8.6        Prediction and Evaluation of Environmental Impacts. 144

8.7        Mitigation of Environmental Impacts. 147

8.8        Evaluation of Residual Environmental Impacts. 148

8.9        Evaluation of Cumulative Environmental Impacts. 149

8.10      Environmental Monitoring and Audit 149

8.11      Summary. 149

8.12      References. 150

9............ FISHERIES Impact. 153

9.1        Introduction. 153

9.2        Environmental Legislation, Standards and Guidelines. 153

9.3        Assessment Methodology. 153

9.4        Description of the Environment 154

9.5        Identification, Prediction and Evaluation of Environmental Impacts. 156

9.6        Mitigation of Environmental Impacts. 158

9.7        Evaluation of Residual Environmental Impacts. 158

9.8        Evaluation of Cumulative Environmental Impacts. 159

9.9        Environmental Monitoring and Audit 159

9.10      Summary. 159

9.11      References. 159

10.......... Environmental Monitoring and Audit Requirements. 161

10.1      Introduction. 161

10.2      Air Quality Impact 161

10.3      Noise Impact 161

10.4      Water Quality Impact 161

10.5      Waste Management Implications. 161

10.6      Impact on Culture Heritage. 162

10.7      Marine Ecological Impact 162

10.8      Fisheries Impact 162

11.......... IMpactS SUMMARY. 163

11.1      Introduction. 163

11.2      Air Quality Impact 163

11.3      Noise Impact 163

11.4      Water Quality Impact 163

11.5      Waste Management Implications. 164

11.6      Impact on Culture Heritage. 164

11.7      Marine Ecological Impact 165

11.8      Fisheries Impact 165

11.9      Overall Summary. 165

12.......... IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION MEASURES. 173

13.......... Summary of Environmental Outcomes. 187

 


List of Tables

Table 2.1           Volume of Dredging

Table 2.2           Approximate Volume of Dredging from the Existing Seawall

Table 3.1           Hong Kong Air Quality Objectives

Table 3.2           Annual Average Concentrations of Pollutants in Year 2005 at EPD’s Sham Shui Po and Kwun Tong Air Quality Monitoring Stations

Table 3.3           Details of Representative Air Sensitive Receivers for the Stage 2 Dredging

Table 4.1           Representative Noise Sensitive Receivers for Construction Noise Impact Assessment for Stage 2 Dredging

Table 4.2           Unmitigated Construction Noise Levels at Representative NSRs during Normal Daytime Working Hours for Stage 2 Dredging

Table 5.1           Summary of Water Quality Objectives for Victoria Harbour WCZ

Table 5.2           Summary of Water Quality Objectives for Eastern Buffer WCZ

Table 5.3           Summary of Water Quality Objectives for Junk Bay WCZ

Table 5.4           WSD’s Water Quality Criteria for Flushing Water at Sea Water Intakes

Table 5.5           Sediment Quality Criteria for the Classification of Sediment

Table 5.6           Summary Statistics of 2005 Marine Water Quality in Victoria Harbour

Table 5.7           Summary Statistics of 2005 Marine Water Quality in Junk Bay and Eastern Buffer

Table 5.8           Summary Statistics of 2005 Marine Water Quality at the Kwun Tong and To Kwa Wan Typhoon Shelter

Table 5.9           Summary Statistics of 2005 Bottom Sediment Quality

Table 5.10         Maximum Production Rates – Scenario 1A (2010)

Table 5.11         Maximum Dredging Rates - Scenario 1B (2013)

Table 5.12         Maximum Dredging Rates - Scenario 1C (2013)

Table 5.12a       Modelling Scenario for Maintenance Dredging

Table 5.13         Summary of Parameters for Sediment Plume Model (Delft3D-PART)

Table 5.14         Coastal Developments Incorporated in the 2010 and 2013 Coastline Configurations

Table 5.15         Pollution Loading from Stonecutters Sewage Treatment Works under HATS

Table 5.16         Predicted SS Concentrations at Seawater Intakes for Scenario 1A – Unmitigated (Base Case Scenario)

Table 5.16a       Predicted SS Concentrations at Seawater Intakes for Scenario 1A – Unmitigated (Sensitivity Test using Higher Dredging Rate for Gas Main Construction)

Table 5.17         Predicted SS Concentrations at Seawater Intakes for Scenario 1B – Unmitigated (Base Case Scenario)

Table 5.17a       Predicted SS Concentrations at Seawater Intakes for Scenario 1B – Unmitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.18         Predicted SS Concentrations at Seawater Intakes for Scenario 1C – Unmitigated (Base Case Scenario)

Table 5.18a       Predicted SS Concentrations at Seawater Intakes for Scenario 1C – Unmitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.19         Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1A - Unmitigated (Base Case Scenario)

Table 5.19a       Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1A - Unmitigated (Sensitivity Test using Higher Dredging Rate for Gas Main Construction)

Table 5.20        Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1B – Unmitigated (Base Case Scenario)

Table 5.20a       Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1B - Unmitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.21        Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1C – Unmitigated (Base Case Scenario)

Table 5.21a       Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1C - Unmitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.22         Comparison of Phase 1 Marine Site Investigation Sediment Elutriate Test Results with the Water Quality Standards

Table 5.23         Comparison of Phase 2 Marine Site Investigation Sediment Elutriate Test Results with the Water Quality Standards

Table 5.24         Calculation of the Effects of Increased Suspended Solids Concentrations on Dissolved Oxygen Concentrations under Scenario 1A

Table 5.25         Calculation of the Effects of Increased Suspended Solids Concentrations on Dissolved Oxygen Concentrations under Scenario 1B

Table 5.26         Calculation of the Effects of Increased Suspended Sediment Concentrations on Dissolved Oxygen Concentrations under Scenario 1C

Table 5.27         Deployment of Silt Curtains - Locations of Applications under Capital Dredging

Table 5.28         Contribution of SS Elevations from this Project under Capital Dredging – Scenario 1A (Base Case Scenario)

Table 5.28a       Contribution of SS Elevations from this Project under Capital Dredging – Scenario 1A (Sensitivity Test using Higher Dredging Rate for Gas Main Construction)

Table 5.29         Contribution of SS Elevations from this Project under Capital Dredging – Scenario 1B (Base Case Scenario)

Table 5.29a       Contribution of SS Elevations from this Project under Capital Dredging – Scenario 1B (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.30         Contribution of SS Elevation from this Project under Capital Dredging – Scenario 1C (Base Case Scenario)

Table 5.30a       Contribution of SS Elevation from this Project under Capital Dredging – Scenario 1C (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.31         Deployment of Silt Screens - Locations of Applications under Capital Dredging

Table 5.32         Predicted SS Concentrations at Seawater Intakes for Scenario 1A – Mitigated (Base Case Scenario)

Table 5.32a       Predicted SS Concentrations at Seawater Intakes for Scenario 1A – Mitigated (Sensitivity Test using Higher Dredging Rate for Gas Main Construction)

Table 5.33         Predicted SS Concentrations at Seawater Intakes for Scenario 1B – Mitigated (Base Case Scenario)

Table 5.33a       Predicted SS Concentrations at Seawater Intakes for Scenario 1B – Mitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.34         Predicted SS Concentrations at Seawater Intakes for Scenario 1C – Mitigated (Base Case Scenario)

Table 5.34a       Predicted SS Concentrations at Seawater Intakes for Scenario 1C – Mitigated (Sensitivity Test using Higher Dredging Rate for CKR)

Table 5.35         Predicted SS Elevations and Sedimentation Rates at Corals for Scenario 1A - Mitigated (Sensitivity Test using Higher Dredging Rate for Gas Main Construction)

Table 6.1           Sediment Quality Criteria for the Classification of Sediment

Table 6.2           Test Species for Biological Testing

Table 6.3           Test Endpoints and Decision Criteria for Biological Testing

Table 6.4           Sediment Chemistry Results Showing Exceedances (from Sub-area A of Marine SI)

Table 6.5           Sediment Chemistry Results Showing Exceedances (from Sub-area B of Marine SI)

Table 6.6           Results of Biological Screening of Category M Samples

Table 6.7           Disposal Options for the Identified Contaminated Sediment

Table 6.8           Volume of Sediment Requiring Different Disposal Options (in m3)

Table 6.9           Summary of Waste Handling Procedures and Disposal Routes

Table 8.1           Criteria and Evaluation of Ecological Importance of Marine Habitats in the Project Area

Table 8.2           Evaluation of Ecological Impacts on Marine Resources

Table 9.1           Recent Hong Kong Capture Fisheries Industry Figures

Table 9.2           Summary of Capture Fisheries Data in Assessment Area by Vessels < 15m

Table 9.3           Recent Hong Kong Culture Fisheries Industry Figures

Table 11.1         Summary of Environmental Impacts Associated with the Project

Table 12.1         Implementation Schedule for Air Quality Measures

Table 12.2         Implementation Schedule for Noise Measures

Table 12.3         Implementation Schedule for Water Quality Measures

Table 12.4         Implementation Schedule for Waste Management Measures

Table 12.5         Implementation Schedule for Cultural Heritage Measures

Table 12.6         Implementation Schedule for Marine Ecology Measures

Table 12.7         Implementation Schedule for Fisheries Measures

Table 13.1         Summary of Key Environmental Outcomes / Benefits

 


List of Figures

Figure 1.1         Preliminary Outline Development Plan

Figure 2.1         General Layout of Proposed Cruise Terminal Berths

Figure 2.2         Proposed Phase I Berth Arrangement for Cruise Terminal

Figure 2.3         Proposed Longer Term Arrangement for Cruise Terminal

Figure 2.4a        Dredging Zones for the Cruise Terminal

Figure 2.4         Staged Dredging Requirements for the Cruise Terminal

Figure 2.4b        Extent of Submarine Outfall Dredging

Figure 2.5         Existing Sea Bed Levels within the Study Area

Figure 2.6         Deck Option 1 (Pile Deck)

Figure 2.7         Deck Option 2 (Caission)

Figure 2.8         Deck Option 3 (Block Work Wall with Wave Absorbing Chamber)

Figure 2.9         Deck Option 4 (Bored Pile Wall with Anchor)

Figure 2.10        Deck Option 5 (Precast R.C. Counterfort)

Figure 2.11        Deck Option 6 (Sheet Pile Cofferdam)

Figure 2.11a      Predicted Percentage Increase of Sedimentation (with 600m Gap) from the Existing Baseline Condition

Figure 2.12        Concurrent Marine Projects within Kai Tak Development Area

Figure 3.1         Air Quality Assessment Area (Stage 1)

Figure 3.2         Air Quality Assessment Area (Stage 2)

Figure 4.1A       Noise Assessment Area

Figure 4.1         Works Area and Noise Assessment Points

Figure 5.1         Locations of Water Control Zones

Figure 5.2         Locations of Water Quality Sensitive Receivers

Figure 5.3         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1A – Unmitigated

Figure 5.4         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1B – Unmitigated

Figure 5.5         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1C – Unmitigated

Figure 5.6         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1A – Mitigated

Figure 5.7         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1B – Mitigated

Figure 5.8         Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1C – Mitigated

Figure 5.8A       Sediment Loss Rate for Dredging and Sand Filling Activities – Scenario 1D

Figure 5.9         Coastline Configuration for 2010 and 2013

Figure 5.10a      Indicative Silt Curtain Arrangement

Figure 5.10b      Indicative Silt Screen Arrangement

Figure 6.1         Locations of Contaminated Sediment

Figure 7.1         Areas Covered by Previous MAI and Existing Utilities

Figure 8.1         Marine Ecological Survey Locations

Figure 8.2         Locations of Transects for Spot-check Reconnaissance Dives and Rapid Ecological Assessment (REA)

Figure 8.3         Location of Hard Substrata Sea Area within Dredging Site

Figure 8.4         Proposed Coral Recipient Site in Junk Bay

 

List of Appendices

Appendix 2.1       Concurrent Projects

Appendix 2.1A     As-built Drawings of Kai Tak Runway Submarine Outfall

Appendix 4.1       Construction Noise Impact Assessment

Appendix 4.2       Noise Assessment for Maintenance Dredging

Appendix 4.3       Confirmation of the Plant Inventory

Appendix 5.1       Grid Layout and Model Coverage

Appendix 5.2       Mathematic Expressions for Pile Frictions

Appendix 5.2a     Relevant Information on SEK Model Calibration

Appendix 5.3       Methodology for Compiling the Pollution Loading Inventory

Appendix 5.4       Sediment Plume Model Results – Scenario 1A – Wet Season

Appendix 5.5       Sediment Plume Model Results – Scenario 1A – Dry Season

Appendix 5.6       Sediment Plume Model Results – Scenario 1B – Wet Season

Appendix 5.7       Sediment Plume Model Results – Scenario 1B – Dry Season

Appendix 5.8       Sediment Plume Model Results – Scenario 1C – Wet Season

Appendix 5.9       Sediment Plume Model Results – Scenario 1C – Dry Season

Appendix 5.10     Sediment Plume Model Results (with KTD works only) – Scenario 1A – Wet Season

Appendix 5.11     Sediment Plume Model Results (with KTD works only) – Scenario 1A – Dry Season

Appendix 5.12     Sediment Plume Model Results (with KTD works only) – Scenario 1B – Wet Season

Appendix 5.13     Sediment Plume Model Results (with KTD works only) – Scenario 1B – Dry Season

Appendix 5.14     Sediment Plume Model Results (with KTD works only) – Scenario 1C – Wet Season

Appendix 5.15     Sediment Plume Model Results (with KTD works only) – Scenario 1C – Dry Season

Appendix 5.15A   Maximum Dimension of Mixing Zone for SS Elevation

Appendix 5.16     Tracer Model Results – Scenario 1A

Appendix 5.17     Tracer Model Results – Scenario 1B

Appendix 5.18     Tracer Model Results – Scenario 1C

Appendix 6.1a     ETWB TCW No. 31/2004

Appendix 6.1       Endorsed RSSP Rev2

Appendix 6.2       Sediment Quality Report

Appendix 7.1       Archaeological Monitoring Brief for Kai Tak Dredging

Appendix 8.1       Photographs of Different Marine Environments in the Kai Tak Area

Appendix 8.2       Marine Ecological Survey - Benthos

Appendix 8.3       Photographs of Intertidal Habitats at each Surveyed Location in the Kai Tak Area

Appendix 8.4       Intertidal Fauna Recorded within the Project Area

Appendix 8.5       Report on Spot-Check and Rapid Ecological Assessment Survey

Appendix 11.1     Key Assessment Assumptions and Methodologies