TABLE OF CONTENTS
Page
Purpose and Objective of the Project 2-1
Consideration of Alternative Disinfection Methods and Selection of Preferred Disinfection
Technology 2-5
Project Elements 2-17
Project Location 2-19
Continuous Public Involvement 2-19
Project Programme 2-28
Interaction with Other Projects 2-28
Introduction 3-1
Environmental Legislation, Policies, Plans, Standards and Criteria 3-1
Description of the Environment 3-1
Identification of Environmental Impacts 3-3
Prediction and Evaluation of Environmental Impacts 3-5
Mitigation of Adverse Environmental Impacts 3-5
Evaluation of Residual Impacts 3-6
Environmental Monitoring and Audit 3-6
Conclusions 3-6
Introduction 4-1
Environmental Legislation, Policies, Plans, Standard Criteria 4-1
Description of the Environment 4-3
Noise4 Sensitive Receivers 4-4
Identification of Environmental Impacts 4-5
Assessment Methodology 4-6
Prediction and Evaluation of Environmental Impacts 4-7
Mitigation of Adverse Environment Impacts 4-8
Evaluation of Residual Impacts 4-9
Environmental Monitoring and Audit 4-9
Conclusions 4-10
Introduction 5-1
Water Sensitive Receivers 5-2
Water Quality Standards, Guidelines and Criteria in Hong Kong 5-2
Assessment Criteria for this Water Quality Impact Assessment 5-13
Description of the Environment 5-16
Assessment Methodology 5-24
Identification of Environmental Impacts 5-36
Prediction and Evaluation of Environmental Impacts 5-37
Mitigation of Adverse Environmental Impacts 5-64
Evaluation of Residual Impact 5-66
Environmental Monitoring and Audit 5-66
Conclusions 5-67
6. HUMAN HEALTH RISK ASSESSMENT................................................................. 6-1
Introduction 6-1
Objective, Scope and Focus of Assessment 6-1
Scenarios Considered in Assessment 6-1
Assessment Methodology 6-2
Assessment Criteria 6-3
Data Collection 6-4
Selected Contaminant of Concern and Effluent Concentration for Risk Assessment 6-5
Risk Assessment Results 6-6
Dilution Factors For ZID and Far-field COC Concentration 6-6
Human Health Risk Assessment 6-9
Cumulative Impacts 6-10
Assumptions in Risk Assessment 6-12
Evaluation of Residual Impacts 6-14
Mitigation of Environmental Impact 6-14
Environmental Monitoring and Auditing 6-14
Conclusions 6-14
Reference 6-15
Introduction 7-1
Objective, Scope and Focus of Assessments 7-1
Scenarios Considered in Assessments 7-2
Assessment Methodology 7-2
Assessment Criteria 7-4
Data Collection 7-4
Selected Contaminant of Concern and Effluent Concentration for Risk Assessments 7-7
Risk Assessment Results 7-8
Dilution Factors for ZID and Far-field COC Concentration 7-8
Cumulative Impacts 7-14
Assumptions in Risk Assessments 7-19
Evaluation of Residual Impacts 7-22
Mitigation of Environmental Impact 7-22
Environmental Monitoring and Auditing 7-22
Ecological Risk – Aquatic Life 7-22
Ecological Risk – Marine Mammals 7-22
Reference 7-24
8. MARINE ECOLOGICAL IMPACT ASSESSMENT................................................... 8-1
Introduction 8-1
Environmental Legislation, Policies, Plans, Standard Criteria 8-1
Assessment Methodology 8-2
Description of Environment 8-2
Benthic Community 8-3
Coral Community 8-13
Intertidal Community 8-20
Marine Mammals, Green Turtle and Horseshoe Crab 8-30
Marine Park, Marine Reserve and SSIs 8-34
Ecological value 8-35
Identification of Environmental Impacts 8-38
Evaluation of Environmental Impact 8-38
Mitigation of Environmental Impact 8-41
Evaluation of Residual Impacts 8-42
Environmental Monitoring and auditing 8-42
Conclusions 8-42
Reference 8-43
Introduction 9-1
Environmental Legislation, Standards and Guidelines 9-1
Assessment Methodology 9-1
Description of the Environment 9-2
Identification of Environmental Impacts 9-4
Evaluation of Environmental Impacts 9-5
Mitigation of Environmental Impact 9-7
Evaluation of Residual Impacts 9-7
Environmental Monitoring and Auditing 9-8
Conclusions 9-8
References 9-9
Introduction 10-1
Environmental Legislation, Policies, Plans, Standards and Criteria 10-1
Assessment Methodology 10-2
Identification and Evaluation of Environmental Impacts 10-2
Mitigation of Adverse Environmental Impacts 10-4
Evaluation of Residual Impacts 10-6
Environmental Monitoring and Audit 10-6
Conclusion 10-6
Introduction 11-1
Data Collection 11-4
Hazard Identification 11-14
Frequency Estimation 11-33
Consequence Analysis and Risk Summation 11-41
Evaluation of Hazard to Life Impact 11-47
Conclusion 11-48
Reference 11-48
12. IMPACT ON HUMAN HEALTH AND MAN-MADE ENVRIONMENT........................... 12-1
Introduction 12-1
Review of Impact of Atmospheric TRC and CBPs Deposits 12-1
Conclusions 12-3
References 12-3
13. ENVIRONMENTAL MONITORING AND AUDIT...................................................... 13-1
Introduction 13-1
Air Quality Impact 13-1
Noise Impact 13-1
Water Quality Impact 13-2
Human health and Ecological Risk 13-2
Ecological Impact 13-2
Fisheries Impact 13-2
Waste Management Implications 13-2
Hazard to Life 13-3
14. CONCLUSION & SUMMARY of ENVIRONMENTAL OUTCOMES............................ 14-1
Purpose and Scope of the Project 14-1
Summary of EIA Findings 14-1
Air Quality Impact 14-2
Noise impact 14-2
Water Quality Impact 14-2
Human Health Risk and Ecological Risk 14-3
Risk to Human Health 14-4
Risk to Aquatic Life 14-4
Risk to Marine Mammals 14-4
Ecological Impact 14-4
Fisheries Impact 14-5
Waste Management Implications 14-5
Hazard to Life 14-6
Impact on Human Health and Mad-made Environment 14-6
Overall Conclusion 14-6
15. IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION MEASURES..... 15-1
LIST OF TABLES
Table 2.1 Annual Ranking System for Beaches 2-2
Table 2.2 Summary of Environmental Benefits and Dis-benefits of the Disinfection
Options 2-11
Table 2.3 Green Groups, Professional Bodies and Academics Institutions Invited for
Consultation Exercises 2-20
Table 2.4 Summary of Key Continuous Public Involvement 2-20
Table 2.5 Summary of Key Comments/Views from the Public – December 2005 2-21
Table 2.6 Summary of Key Comments/Views from the Public – March to July 2006 2-24
Table 2.7 Summary of Key Comments/Views from the Public – October 2006 2-26
Table 3.1 Hong Kong Air Quality Objectives 3-1
Table 3.2 EPD Air Monitoring at Sham Shui Po Station in 2005 3-2
Table 3.3 Details of Air Sensitive Receivers 3-2
Table 4.1 Area Sensitivity Ratings (ASRs) 4-1
Table 4.2 Construction Noise Criteria for Activity other than Percussive Piling 4-2
Table 4.3 Acceptable Noise Levels (ANILs) (dB(A)) 4-2
Table 4.4 Measured Noise Levels 4-3
Table 4.5 Noise Criteria for Operational Noise Impact for the Noise Sensitive Receivers
near the proposed Dechlorination Plant 4-3
Table 4.6 Noise Criteria for Operational Noise impact for the Noise Sensitive Receivers
near the proposed Chlorination Plant 4-4
Table 4.7 Details of Noise Sensitive Receivers 4-4
Table 4.8 Predicted Noise Levels at Representative NSRs During Operation Phase 4-8
Table 5.1 Summary of Water Quality Objectives for North Western WCZ 5-3
Table 5.2 Summary of Water Quality Objectives for Western Buffer WCZ 5-4
Table 5.3 Summary of Water Quality Objectives for Victoria Harbour WCZ 5-6
Table 5.4 Summary of Water Quality Objectives for Eastern Buffer WCZ 5-7
Table 5.5 Summary of Water Quality Objectives for Junk Bay WCZ 5-8
Table 5.6 Summary of Water Quality Objectives for Southern WCZ 5-9
Table 5.7 WSD Standards at Flushing Water Intakes 5-10
Table 5.8a Reference Marine Water Quality Criteria at Edge of Mixing Zone (1) for Far
Field Water Quality Assessment 5-12
Table 5.8b Reference Marine Water Quality Criteria for Near Field Water Quality
Assessment 5-12
Table 5.9a Proposed Marine Water Quality Criteria for Far Field Water Quality
Assessment 5-14
Table 5.9b Proposed Marine Water Quality Criteria for Near Field Water Quality
Assessment 5-15
Table 5.10 Baseline Water Quality Condition for North Western WCZ in 2005 5-18
Table 5.11 Baseline Water Quality Condition for Western Buffer WCZ in 2005 5-18
Table 5.12 Baseline Water Quality Condition for Victoria Harbour WCZ in 2005 5-19
Table 5.13 Baseline Water Quality Condition for Junk Bay and Eastern Buffer in 2005 5-19
Table 5.14 Baseline Water Quality Condition for Southern WCZ in 2005 5-20
Table 5.15 Maximum Ambient Levels for TRC and CBC 5-21
Table 5.16 Annual Trend of E.coli levels at Tseun Wan Beaches 5-22
Table 5.17 Typical Hourly Pattern for the Project Effluent 5-26
Table 5.18 Recommended Sodium Hypochlorite and Sodium Bisulphide Dosages for
HATS 5-27
Table 5.19 Summary of Chemical Analysis Results 5-28
Table 5.20 Modelling Scenarios for Operational Phase Impact Assessment 5-30
Table 5.21 Modelling Scenarios for Baseline Conditions (Without the Project) 5-31
Table 5.22 Proposed Modelling Scenarios for Emergency Discharge of Undisinfected
CEPT Effluent 5-33
Table 5.23 Proposed Modelling Scenarios for Emergency Discharge of TRC 5-35
Table 5.24 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for 2009 –
Wet (or Bathing) Season 5-41
Table 5.25 Predicted Geometric Mean E.coli levels at Tsuen Wan Beaches for 2009 –
Dry (or Non-bathing) Season 5-41
Table 5.26 Predicted Geometric Mean E.coli Levels at Tsuen Wan beaches for 2013 –
Wet (or Bathing) Season 5-42
Table 5.27 Predicted Geometric Mean E.coli Levels at Tsuen Wan beaches for 2013 –
Dry (or Non-bathing) Season 5-42
Table 5.28 Predicted Geometric Mean E.coli Levels at Tsuen Wan beaches for 2020 –
Wet (or Bathing) Season 5-43
Table 5.29 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for 2020 –
Dry (or Non-bathing) Season 5-43
Table 5.30 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for
Ultimate Year – Wet (or Bathing) Season 5-44
Table 5.31 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for
Ultimate Year – Dry (Non-bathing) Season 5-44
Table 5.32 Predicted Geometric Mean E.coli Levels at Tsuen wan Beaches for 2013 –
Sensitivity Test – Wet (or Bathing) Season 5-46
Table 5.33 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for 2013 –
Sensitivity Test – Dry (or Non-bathing) Season 5-46
Table 5.34 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for 2020 –
Sensitivity Test – Wet (or Bathing) Season 5-46
Table 5.35 Predicted Geometric Mean E.coli Levels at Tsuen Wan Beaches for 2020 –
Sensitivity Test – Dry (or Non-Bathing) Season 5-47
Table 5.36 Predicted Maximum E.coli Levels at WSD Flushing Water Intakes –
Wet Season 5-49
Table 5.37 Predicted Maximum E.coli Levels at WSD Flushing Water Intakes –
Dry Season 5-49
Table 5.38 Predicted Maximum E.coli Levels at WSD Flushing Water Intakes for Stage 2B –
Wet Season 5-50
Table 5.39 Predicted Maximum E.coli Levels at WSD Flushing Water Intakes for Stage 2B –
Dry Season 5-50
Table 5.40a Summary of WETT Results for CEPT Effluent (Acute Toxicity) 5-52
Table 5.40b Summary of WETT Results for CEPT Effluent (Chronic Toxicity) 5-52
Table 5.41a Summary of WETT Results for Secondary Treated Effluent (Acute Toxicity) 5-52
Table 5.41b Summary of WETT Results for Secondary Treated Effluent (Chronic Toxicity) 5-52
Table 5.42 Maximum Dimensions of Mixing Zones for CBP 5-54
Table 5.43 Summary of Chronic Toxicity Unit (TUc) at Edge of Mixing Zone 5-54
Table 5.44 Summary of TRC Levels at Edge of ZID 5-55
Table 5.45 Summary of Acute Toxicity Unit (TUa) at Edge of ZID 5-56
Table 5.46 Predicted Oxygen Depletion at the SCISTW Outfall Location 5-57
Table 5.47 Predicted Geometric Mean E.coli Levels under Emergency Situations 5-59
Table 5.48 Predicted Peak E,coli Levels During Emergency Discharge Period 5-60
Table 5.49 Maximum Dimensions of Mixing Zones for TRC under Emergency Situation
WM3 5-62
Table 5.50 Predicted Maximum TRC Levels During the Emergency Discharge Periods at
Stations VM8 and VM3 5-62
Table 5.51 Recommended Effluent Standards for the HATS 5-68
Table 5.52 Marine Water Quality Criteria Adopted in the Water Quality Impact
Assessment 5-68
Table 6.1 Summary of Chemical Analysis Results 6-5
Table 6.2a Selected COCs and Effluent Concentrations for HHRA (Project Scenarios
1 to 4) 6-6
Table 6.2b Selected COCs and Effluent Concentrations (Project Scenario 5) 6-6
Table 6.3a Estimated Dilution Factors (Project Scenario 1) 6-7
Table 6.3b Estimated Dilution Factors (Project Scenario 2) 6-7
Table 6.3c Estimated Dilution Factors (Project Scenario 3) 6-8
Table 6.3d Estimated Dilution Factors (Project Scenario 4) 6-8
Table 6.4a Estimated Lifetime Incremental Cancer Risk Due to Potential CBPs 6-9
Table 6.4b Estimated Non-cancer Health Hazard Index (Adult Receptor) Due to Potential
CBPs 6-9
Table 6.4c Estimated Non-cancer Health Hazard Index (Child Receptor) Due to Potential
CBPs 6-10
Table 6.5 Estimated Lifetime Incremental Cancer Risk For Extremely Conservative Exposure
Scenario 6-10
Table 6.6a Estimated Lifetime Incremental Cancer Risk (Due to CBPs and Other
Pollutants) 6-11
Table 6.6b Estimated Non-cancer Health Hazard Index (Adult Receptor, Due to CBPs and
Other Pollutants) 6-11
Table 6.6c Estimated Non-cancer Health Hazard Index (Child Receptor, Due to CBPs and
Other Pollutants) 6-12
Table 6.7 Estimated Lifetime Incremental Cancer Risk For Extremely Conservative Exposure
Scenario (Due to CBPs and Other Pollutants) 6-12
Table 7.1 Summary of Chemical Analysis Results 7-5
Table 7.2a Summary of WETT Result for CEPT Effluent (Acute Toxicity) 7-6
Table 7.2b Summary of WETT Result for CEPT Effluent (Chronic Toxicity) 7-6
Table 7.2c Summary of WETT Result for Secondary Treated Effluent (Acute Toxicity) 7-6
Table 7.2d Summary of WETT Result for Secondary Treated Effluent (Chronic Toxicity) 7-7
Table 7.3a Selected COCs and Effluent Concentrations for ERA (Project Scenario
1 to 4) 7-8
Table 7.3b Selected COCs and Effluent Concentrations for ERA (Project Scenario 5) 7-8
Table 7.4 Averaging Time of TRVs and Corresponding Dilution Factors 7-9
Table 7.5a Estimated Dilution Factors (Project Scenario 1) 7-9
Table 7.5b Estimated Dilution Factors (Project Scenario 2) 7-9
Table 7.5c Estimated Dilution Factors (Project Scenario 3) 7-10
Table 7.5d Estimated Dilution Factors (Project Scenarios 4 and 5) 7-10
Table 7.6a Estimated HQ and HI to Aquatic Life (Project Scenario 1) Due to Potential
CBPs 7-11
Table 7.6b Estimated HQ and HI to Aquatic Life (Project Scenario 2) Due to Potential
CBPs 7-11
Table 7.6c Estimated HQ and HI to Aquatic Life (Project Scenario 3) Due to Potential
CBPs 7-12
Table 7.6d Estimated HQ and HI to Aquatic Life (Project Scenario 4) Due to Potential
CBPs 7-12
Table 7.6e Estimated HQ and HI to Aquatic Life (Project Scenario 5) Due to Potential
CBPs 7-12
Table 7.7a Estimated HQ and HI to Marine Mammals (Dolphins) Due to Potential
CBPs 7-13
Table 7.7b Estimated HQ and HI to Marine Mammals (Porpoises) Due to Potential
CBPs 7-13
Table 7.8 Acute and Chronic Toxicities at Edge of ZID and Edge of Mixing Zone 7-14
Table 7.9a Estimated HQ and HI to Aquatic Life (Project Scenario 1, Due to CBPs and
Other Pollutants) 7-15
Table 7.9b Estimated HQ and HI to Aquatic Life (Project Scenario 2, Due to CBPs and
Other Pollutants) 7-15
Table 7.9c Estimated HQ and HI to Aquatic Life (Project Scenario 3, Due to CBPs and
Other Pollutants) 7-16
Table 7.9d Estimated HQ and HI to Aquatic Life (Project Scenario 4, Due to CBPs and
Other Pollutants) 7-16
Table 7.9e Estimated HQ and HI to Aquatic Life (Project Scenario 5, Due to CBPs and
Other Pollutants) 7-17
Table 7.10a Estimated HQ and HI for Dolphins (Due to CBPs and Other Pollutants) 7-18
Table 7.10b Estimated HQ and HI for Porpoises (Due to CBPs and Other Pollutants) 7-18
Table 8.1 Occurrence of Species Recorded of Main Species in 120 Sampling Stations in
Summer and Winter Survey 8-3
Table 8.2 Distribution of Marine Benthic Organisms (Density > 100m2) in Summer and
Winter Survey 8-4
Table 8.3 Community Diversity 8-5
Table 8.4 Relative Abundance (%) of Major Taxa at 6 Study Sites 8-7
Table 8.5 Relative Biomass (%) of Major Taxa in Study Sites 8-8
Table 8.6 Relative Abundance of the 5 Most Dominant Species 8-8
Table 8.7 Relative Biomass of the 5 Most Dominant Species at Each Sampling Site 8-9
Table 8.8 Community Structure of 6 Study Sites 8-9
Table 8.9 Summary of Benthic Survey Results 8-11
Table 8.10 The Vertical Zonation of Abundant Invertebrates Recorded in Lamma Island
Intertidal Rocky Shore 8-20
Table 8.11 The Vertical Zonation of Abundant Invertebrates Recorded in Sandy Bay
Intertidal Rocky Shore 8-21
Table 8.12 The Vertical Zonation of Abundant Invertebrates Recorded in Junk Bay
Intertidal Rocky Shore 8-21
Table 8.13 The Vertical Zonation of Abundant Invertebrates Recorded in Fat Tong Chau
Intertidal Rocky Shore 8-22
Table 8.14 The Vertical Zonation of Abundant Invertebrates Recorded in Junk Bay
Intertidal Rocky Shore 8-22
Table 8.15 The Vertical Zonation of Abundant Invertebrates Recorded in Junk Bay
Intertidal Rocky Shore 8-23
Table 8.16 The Vertical Distribution of Dominant Species in Intertidal Rocky Shore 8-26
Table 8.17 Mean Number of Individuals, Species Diversity (H’) and Evenness (J’) (Standard
Deviation) of Intertidal Organisms Recorded from the Artificial Boulder Shore
During the Survey at Tai O 8-27
Table 8.18 Ecological Value of Marine Benthos within Potential Impact Areas (Victoria
Harbour and Western Buffering WCZs) 8-35
Table 8.19 Ecological Value of Coral Community in Potentially Impacted Areas (Victoria
Harbour and Western Buffers WCZs) 8-36
Table 8.20 Ecological Value of Intertidal Community in Potentially Impacted Areas (Victoria
Harbour and Western Buffer WCZs) 8-37
Table 8.21 Ecological Value of Chinese White Dolphin within Potentially Impacted Areas
(Vitoria Harbour and Western Buffer WCZs) 8-37
Table 8.22 Potential Ecological Impact on Benthos Habitats within Potential Impacted Areas
(Victoria Harbour and Western Buffer WCZs) 8-39
Table 8.23 Potential Ecological Impact of Coral Community within Potential Impacted Areas
(Victoria Harbour and Western Buffer WCZs) 8-40
Table 8.24 Potential Ecological Impact of Intertidal Communities within Potential Impacted
Areas (Victoria Harbour and Western Buffer WCZs) 8-40
Table 8.25 Ecological Impact of Chinese White Dolphin within Potential Impacted Areas
(Western Buffer and Victoria Harbour WCZs) 8-41
Table 9.1 Potential Fisheries Impacts During the Operation Phase of the Project 9-7
Table 10.1 Summary of Waste Handling Procedures and Disposal Routes for Construction
Phase 10-5
Table 11.1 Population in Vicinity of ADF 11-8
Table 11.2 Road and Railway Population within the Assessment Area 11-6
Table 11.3 Estimated Marine Population in Vicinity of SCISTW 11-7
Table 11.4 Stability Category - Wind Speed Frequencies at Ching Pak House Weather
Station (day-time) 11-7
Table 11.5 Weather Class - Wind Direction Frequencies at Ching Pak House Weather
Station (day-time) 11-14
Table 11.6 Estimated Toxic Gas Generation Rate in Various Incompatible Chemical Mixing
Events 11-43
Table 11.7 Estimated Frequency of Various Incompatible Chemical Mixing Events 11-44
Table 11.8 Properties of Various Incompatible Chemicals Mixing Events 11-45
Table 11.9 Distance from Toxic Gas Release Location Receiving Fatality Probability of 3%
and1% under Weather Class 1F 11-46
Table 11.10 FN Results of Various Incompatible Chemical Mixing Events 11-48
Table 12.1 Estimated TRC and CBPs Concentration Levels at ZID 12-2
Table 14.1 Recommended Effluent Standards for the HATS 14-3
Table 14.2 Summary of Key Environmental Outcomes / Benefits 14-6
Table 15.1 Implementation Schedule for Air Quality Impact 15-1
Table 15.2 Implementation Schedule for Noise Impact 15-3
Table 15.3 Implementation Schedule for Water Quality Impact 15-4
Table 15.4 Implementation Schedule for Waste Management Implications 15-8
Table 15.5 Implementation Schedule for Hazard to Life 15-11
LIST OF FIGURES
Figure 2.1 General Layout of Proposed Chlorination / Dechlorination Disinfection System
Figure 2.2 Preliminary Layout of Proposed Dechlorination Plant
Figure 2.3 Preliminary Layout of Proposed Chlorination Plant
Figure 2.4 Schematic Flow Diagram of Chlorination Control System for ADF
Figure 2.5 Tentative Construction Programme
Figure 2.6 Planned Diving Rescue and Diving Training Centre for Fire Services Department
Figure 3.1 Locations of Representative Air Sensitive Receivers
Figure 4.1 Measurement Locations of Existing Noise Levels
Figure 4.2 Layout of Dormitories within FSD Diving Training Centre
Figure 4.3 Layout of Classroom within the FSD Diving Training Centre
Figure 4.4 Location of Representative Noise Sensitive Receiver for Proposed Dechlorination Plant
Figure 4.5 Location of Representative Noise Sensitive Receiver for Proposed Chlorination Plant
Figure 5.1a Locations of Water Quality Sensitive Receivers (1 of 2 Sheets)
Figure 5.1b Locations of Water Quality Sensitive Receivers (2 of 2 Sheets)
Figure 5.2 Locations of Water Control Zones and Fish Spawning Ground
Figure 5.4 2009 Coastline Configurations
Figure 5.5 2013 Coastline Configurations
Figure 5.6 2020 and Ultimate Coastline Configurations
Figure 5.7 Alternative Coastline Configurations
Figure 5.8 Major Sewage Outfalls in North Western, Western Buffer and Victoria Harbour WCZ
Figure 5.9 Geometric Mean Depth-averaged E.coli Levels- Normal Operation – Overview – Wet Season
Figure 5.10 Geometric Mean Depth-averaged E.coli Levels – Normal Operation – Overview – Dry Season
Figure 5.15 Typical Flow Patterns at Western Buffer WCZ
Figure 5.18 Not used
Figure 5.19 Not used
Figure 5.22 Maximum Depth-averaged TRC Levels- Normal Operation – Wet Season
Figure 5.23 Maximum Depth-averaged TRC Levels – Normal Operation – Dry Season
Figure 5.24 Maximum Depth-averaged Dichloroacetic Acid Levels – Wet Season
Figure 5.25 Maximum Depth-averaged Dichloroacetic Acid Levels – Dry Season
Figure 5.26 Maximum Depth-averaged Trichloroacetic Acid Levels – Wet Season
Figure 5.27 Maximum Depth-averaged Trichloroacetic Acid Levels – Dry Season
Figure 5.28 Maximum Depth-averaged Bromoform Levels – Wet Season
Figure 5.29 Maximum Depth-averaged Bromoform Levels – Dry Season
Figure 5.30 Maximum Depth-averaged Dibromoacetic Acid Levels – Wet Season
Figure 5.31 Maximum Depth-averaged Dibromoacetic Acid Levels – Dry Season
Figure 5.31a Approximate Locations and Extents of Mixing Zone and Initial Dilution Zone
Figure 5.34 Mean Depth-averaged DO Levels – Normal Operation – Wet Season
Figure 5.35 Mean Depth-averaged DO Levels – Normal Operation – Dry Season
Figure 5.36 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2009 Wet Season
Figure 5.37 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2009 Dry Season
Figure 5.38 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2013 Wet Season
Figure 5.39 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2013 Dry Season
Figure 5.40 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2020 Wet Season
Figure 5.41 Maximum Depth-averaged E.coli Levels – Emergency Situation – 2020 Dry Season
Figure 5.42 Maximum Depth-averaged TRC Levels – Emergency Situation – 2009 Wet Season
Figure 5.43 Maximum Depth-averaged TRC Levels – Emergency Situation – 2009 Dry Season
Figure 5.44 Maximum Depth-averaged TRC Levels – Emergency Situation – 2013 Wet Season
Figure 5.45 Maximum Depth-averaged TRC Levels – Emergency Situation – 2013 Dry Season
Figure 5.46 Maximum Depth-averaged TRC Levels – Emergency Situation – 2020 Wet Season
Figure 5.47 Maximum Depth-averaged TRC Levels – Emergency Situation – 2020 Dry Season
Figure 6.1 Site Conceptual Model for HHRA
Figure 7.1 Site Conceptual Model for ERA – Aquatic Life
Figure 7.2 Site Conceptual Model for ERA – Marine Mammals
Figure 8.1a Ecological Resource within Assessment Area
Figure 8.1b Ecological Resource within Assessment Area
Figure 8.2 120 Sampling Stations on Marine Benthos
Figure 8.3 Survey Locations on Benthos and Intertidal Shores
Figure 8.4 Sampling Locations on Marine Benthos Study in Chiu Keng Wan
Figure 8.5 Survey Locations on Coral Community
Figure 8.6 Survey Locations on Coral Community
Figure 8.7 Sightings of Chinese White Dolphin
Figure 8.8 Sightings of Finless Porpoise
Figure 8.9 Seasonal Variation on Sightings of Finless Porpoise
Figure 8.10 Locations for the Records of Horseshoe Crab
Figure 11.1 Societal Risk Guideline
Figure 11.3 Aerial View of SCISTW and Surrounding Area
Figure 11.4 Preliminary Layout of Proposed Dechlorination Plant
Figure 11.5 Preliminary Layout of Proposed Chlorination Plant
Figure 11.6 Populations in Vicinity of HATS ADF
Figure 11.7 Layout Plant of SCISTW Site After HATS Stage 2A Constructions Works
Figure 11.8 Layout Plant of SCISTW Site During HATS Stage 2A Construction Works
Figure 11.9 Routes of the Sodium Hypochlorite and Ferric Chloride Delivery Pipelines
Figure 11.11 Examples of Different Types of Hose Coupling
Figure 11.12 Photos Showing the Ferric Chloride Tank Farm and Adjacent Chemical Dosing Building
Figure 11.15 Estimated Fatality Probability at Various Distance from Toxic Gas Release Locations
Figure 11.16 Individual Risk Contour
Figure 11.17 Societal Risk Curve
APPENDICES
Appendix 4-1 Baseline Noise Survey Study
Appendix 4-2 Construction Noise Impact Assessment (Dechlorination Plant)
Appendix 4-3 Construction Noise Impact Assessment (Chlorination Plant and Day Tank)
Appendix 4-4 Fixed Plant Noise Impact Assessment
Appendix 5-1 Near Field Model Results
Appendix 5-2 Methodology for Compiling the Pollution Loading Inventory
Appendix 5-2a Model Accuracy and Limitations
Appendix 5-3 HATS Model Performance Review
Appendix 5-4a Time Varying E.coli Levels Based on Bench-scale Chlorination Studies
Appendix 5-4b Model Results – Time Varying Effluent Loading
Appendix 5-4 Assumed Flow and Effluent Concentrations for Major Effluent Discharges
Appendix 5-5 E.coli Results at Indicator Points – Normal Operation 2009
Appendix 5-6 E.coli Results at Indicator Points – Normal Operation 2013
Appendix 5-7 E.coli Results at Indicator Points – Normal Operation 2020
Appendix 5-8 E.coli Results at Indicator Points – Normal Operation Ultimate Year
Appendix 5-9 E.coli Levels – Emergency Situation – 2009 Wet Season Neap Tide
Appendix 5-10 E.coli Levels – Emergency Situation – 2009 Wet Season Spring Tide
Appendix 5-11 E.coli Levels – Emergency Situation – 2009 Dry Season Neap Tide
Appendix 5-12 E.coli Levels – Emergency Situation – 2009 Dry Season Spring Tide
Appendix 5-13 Depth-averaged TRC Levels – Emergency Situation – 2009 Wet Season Neap Tide
Appendix 5-14 Depth-averaged TRC Levels – Emergency Situation – 2009 Wet Season Spring Tide
Appendix 5-15 Depth-averaged TRC Levels – Emergency Situation – 2009 Dry Season Neap Tide
Appendix 5-16 Depth-averaged TRC Levels – Emergency Situation – 2009 Dry Season Spring Tide
Appendix 5-17 ProPECC PN 1/94 Construction Site Drainage
Appendix 6-1 Methodology for Risk Assessment
Appendix 6-2 Detailed Assessment Results of Human Health Risk Assessment
Appendix 6-3 Methodology for Cumulative Risk Impact Assessment
Appendix 6-4 Detailed Cumulative Risk Impact Assessment Results of Human Health Risk Assessment
Appendix 7-1 Methodology For Ecological Risk Assessment
Appendix 7-2 Detailed Assessment Results of Ecological Risk Assessment – Aquatic Life
Appendix 7-3 Detailed Assessment Results of Ecological Risk Assessment – Marine Mammals
Appendix 7-4 Methodology for Cumulative Ecological Risk Impact Assessment
Appendix 8-1 The Hard Coral Species Recorded in Cape D’ Aguilar
Appendix 8-2 The Corals Species Recorded in Kau Yi Chau and Sze Pak Wan
Appendix 8-3 Photographic Record of Representative Habitats and Species of Conservation Interest
Appendix 11-1 Photo Documentation of Site Survey
Appendix 11-2 Estimation of Occupancy Factor and Outdoor Population Fraction
Appendix 11-3 Road Population Estimation and Site Survey Data
Appendix 11-4 Marine Population Estimation and Site Survey Data
Appendix 11-5 Relevant Input Parameters of SAFETI
Appendix 11-6 Toxic Gas Impact Distance
ANNEXES
Annex A Concentration of Interest for Contaminants of Potential Concern
Annex B Derivation of Toxicity Reference Value for Aquatic Life
Annex C Derivation of Toxicity Reference Dose for Marine Mammals
Annex D Results of Incident Review