Background
Objectives of the EIA Study
The Approach
Report Structure
Project Requirements
Project Location
Environmental Benefits of the Project
Scope of the Project
Consideration of Alternative Options
Construction Methods
Works Pregramme
Long-Term Treatment and Disposal Methods
Related Projects
Public Consultation
Introduction
Environmental Legislation, Standards and Guidelines
Baseline Conditions
Sensitive Receivers
Assessment Methodology
Environmental Impact Identification, Prediction and Evaluation
Mitigation of Adverse Environmental Impact
Environmental Monitoring And Audit
Introduction
Environmental Legislation, Policies, Plans, Standards and Criteria
Description of the Environment
Description of Assessment Methodologies
Identification of Environmental Impacts
Prediction and Evaluation of Environmental Impacts
Mitigation of Adverse Environmental Impacts
Definition and Evaluation of Residual Environmental Impacts
Environmental Monitoring and Audit
Introduction
Environmental Legislation, Standards and Guidelines
Baseline Conditions
Sensitive Receivers
Assessment Methodologies
Identification of Impacts
Prediction and Evaluation of Impact
Mitigation of Adverse Impacts
Residual Environmental Impacts
Environmental Monitoring and Auditing Requirements
Introduction
Environmental Legislation, Standards and Guidelines
Description of The Environment
Assessment Methodologies
Baseline Conditions
Identification, Prediction and Evaluation of Environmental Impacts
Mitigation of Adverse Environmental Impacts
Definition and Evaluation of Residual Environmental Impacts
Introduction
Environmental Legislation, Policies, Plans, Standards and Criteria
Description of the Environment
Assessment Methodologies
Environmental Impact Identification, Prediction and Evaluation
Mitigation of Adverse Environmental Impacts
Definition and Evaluation of Residual Environmental Impacts
Environmental Monitoring and Audit
Introduction
Environmental Legislation, Policies, Plans, Standards and Criteria
Description of the Environment
Terrestrial Ecology
Intertidal Ecology
Subtidal Ecology
Summary of Baseline Conditions
Description of Assessment Methodologies
Identification, Prediction and Evaluation of Environmental Impacts
Mitigation of Adverse Environmental Impacts
Definition and Evaluation of Residual Environmental Impacts
Ecological Monitoring and Audit
References Cited
Environmental Legislation, Policies, Plans, Standards and Criteria
Description of the Environment
Assessment Methodologies
Environmental Impact Identification, Prediction and Evaluation
Mitigation of Adverse Environmental Impacts
Definition and Evaluation of Residual Environmental Impacts
Introduction
Background and Options
Project Description
Assessment Methodology - General
Baseline Survey
Visual Baseline Conditions
Review of Planning and Development Control Framework
Potential Sources of Impacts
Landscape Impact Assessment
Visual Impact Assessment
Mitigation Measures
Introduction
Air Quality Impact
Noise Impact
Water Quality Impact
Solid Waste Management
Ecological Impact
Fisheries Impact
Visual and Landscape Impact
Introduction
Air Quality
Noise
Water Quality
Sediment Contamination
Solid Waste Management
Ecological Impact
Fisheries Impact
Visual and Landscape Impacts
Overall Conclusion
LIST OF TABLES
Table 3.1 Hong Kong Air Quality Objectives
Table 3.2 Description of Air Sensitive Receivers (ASRs)
Table 3.3 Predicted TSP concentrations at representative ASRs (Unmitigated)
Table 3.4 Predicted Odour Concentrations at Representative ASRs
Table 3.5 Predicted TSP Concentration at Representative ASRs (Mitigated)
Table 4.1 Area Sensitivity Ratings
Table 4.2 Construction Noise Criteria for Activity other than Percussive Piling
Table 4.3 Acceptable Noise Levels (ANLs) in dB(A)
Table 4.5 Summary of Representative Noise Sensitive Receivers
Table 4.6Cumulative Construction Noise Levels at Representative NSRs (Without Mitigation)
Table 4.7 Cumulative Operational Noise Levels at Representative (Without Mitigation)
Table 4.8 Cumulative Construction Noise Levels at Representative NSRs (With Mitigation)
Table 5.1Water Quality Objectives for Marine Waters of Southern Water Control Zone
Table 5.2Ambient and Allowable Elevation in Suspended Sediment Concentrations (mg/L)
Table 5.3Predicted Elevation in Suspended Sediment Concentrations (Unmitigated Scenario)
Table 5.4Calculation of Unionised Ammoniacal Nitrogen Concentrations during Dredging
Table 5.5Modelling Results for the Wet Season Conditions (Unstratified Conditions)
Table 5.6Modelling Results for the Wet Season Conditions (Summer Stratified Conditions)
Table 5.7Modelling Results for the Dry Season Conditions
Table 5.8Modelling Results at Sensitive Receivers
Table 5.9CORMIX Modelling Parameters
Table 5.10aPredicted Water Quality at the Fish Culture Zone (Cumulative Effluent Flow)
Table 5.10bPredicted Water Quality at the Fish Culture Zone (Net Effluent Flow)
Table 5.11Predicted Elevation in Suspended Sediment Concentrations (Mitigated)
Table 6.1Baseline Sediment Quality at Sok Kwu Wan
Table 6.2 Sediment Classification Criteria
Table 6.4 Classification of Contaminated Sediments Analysis Results
Table 8.1Bird species of special conservation significance on Lamma Island (from literature review).
Table 8.2Bird species of conservation concern recorded at terrestrial habitats on the study area
Table 8.3Summary of reptile and amphibian species of conservation concern in Lamma Island from literature survey
Table 8.4Additional butterfly species reported in the study area between 1998 and 1999 (P. K. L. Lau, pers. comm.)
Table 8.5Butterfly Species Recorded in the Study Site
Table 8.6Flora and fauna found along the rocky shore of Sok Kwu Wan
Table 8.7Intertidal fauna and algae recorded on preliminary surveys at Sok Kwu Wan, September 1998
Table 8.8Abundance of intertidal fauna and percent cover of algae inside quadrats long the transect near Outfall Option 2 in winter 1998
Table 8.9Abundance of intertidal fauna and percent cover of algae inside quadrats along the transect near Outfall Option 2 in spring 1999
Table 8.10Abundance of intertidal fauna and percent cover of algae inside quadrats along the transect near Outfall Option 2 in summer 1999
Table 8.12Abundance of intertidal fauna inside quadrats along the transect near Outfall Option 2 in 2002
Table 8.12bBird species of conservation concern recorded at rocky shore on the study area
Table 8.13Coral species recorded at Site 1, December 1998
Table 8.14Coral species recorded at Site 2 in December 1998
Table 8.15Construction-stage Impacts
Table 8.16Operation-stage Impacts
Table 8.17Proposed Construction-stage Mitigation Measures
Table 9.3Summary of Impact Evaluation
Table 10.1 Summary of Landscape Impact Assessment in Construction Phase
Table 10.2Summary of Landscape Impact Assessment in Operation Phase
Table 10.3Summary of Visual Impact Assessment in Construction Phase
Table 10.4Summary of Visual Impact Assessment in Operation Phase
Table 10.5Implementation Schedule of Mitigation Measures
Table 12.2 Implementation Schedule of Noise Measures
Table 12.3 Implementation Schedule of Water Quality Control Measures
Table 12.4 Implementation Schedule of Sediment Contamination Mitigation Measures
Table 12.5 Implementation Schedule of Solid Waste Management Measures
Table 12.6 Implementation Schedule of Ecological Impact Measures
Table 12.7 Implementation Schedule of Fisheries Impact Measures
Table 12.8 Implementation Schedule of Landscape and Visual Impact Measures
LIST OF FIGURES
Figure 2.2 Sewage Treatment and Disposal Options Under Outlying Islands Sewerage Master Plan
Figure 2.5 Sewerage Collection System Recommended Under Package J
Figure 3.1 Locations of Representative Air Sensitive Receivers
Figure 3.2 Contours of Odour Concentration in OU/5S at 1.5m Above Ground
Figure 3.3 Contours of Odour Concentration in OU/5S at 4.5m Above Ground
Figure 4.1 Locations of Background Noise Measurements
Figure 4.3 Typical Design of Noise Screening Structure for Sewer Construction
Figure 4.4 Typical Design of Acoustic Shed for Concreting Work of Manhole
Figure 5.2 Location of the Submarine Outfall
Figure 5.3 Locations of Emergency Outfalls for the Pumping Stations and STW
Figure 5.4 Initial Dilution of the Effluent Plume (Wet Season – Unstratified Conditions)
Figure 5.5 Initial Dilution of the Effluent Plume (Wet Season – Summer Stratified Conditions)
Figure 5.6 Initial Dilution of the Effluent Plume (Dry Season – Unstratified Conditions)
Figure 5.7 Downstream TIN Level from Source – Dry Season
Figure 5.8 Downstream TIN Level from Source – Wet Season with Stratification
Figure 5.9a Typical Design of Silt Curtain
Figure 5.9b Arrangement of 2-layer Silt Curtains
Figure 5.10 Emergency Discharge Action Plan
Figure 8.1 Areas of Conservation Significance in Relation to Sok Kwu Wan Study Area
Figure 8.2 Habitat Map, Sok Kwu Wan
Figure 8.3 Composition of the Epibenthic Community (0-3m in depth) at Site 1
Figure 8.4 Composition of the Epibenthic Community (0-3m in depth) at Site 2
Figure 8.8 Locations of Pumping Station P2 and the moist area with Romer’s Tree Frog
Figure 10.1Landscape Character Areas and Vegetation Areas
Figure 10.2Visual Envelope and Existing Visually Sensitive Receiver Groups
Figure 10.3Photographic Viewpoints
Figure 10.4.1Photographic Record
Figure 10.4.2Photographic Record
Figure 10.4.3Photographic Record
Figure 10.5Landscape Impact at Construction Phase Before Mitigation
Figure 10.6Landscape Impact at Construction Phase Upon Mitigation
Figure 10.7Landscape Impact at Operation Phase Before Mitigation
Figure 10.8Landscape Impact at Operation Phase Upon Mitigation
Figure 10.9 Visual Impact at Construction Phase Before Mitigation
Figure 10.10 Visual Impact at Construction Phase Upon Mitigation
Figure 10.11 Visual Impact at Operation Phase Before Mitigation
Figure 10.12Visual Impact at Operation Phase Upon Mitigation
Figure 10.13Sewerage Treatment Works Landscape Finishes
Figure 10.14.1Proposed Pumping Stations and Sewerage Treatment Works Colour Finishes
Figure 10.14.2Typical Boundary Wall Elevation
Figure 10.15aPhotomontage of the Sewage Treatment Works (STW)
Figure 10.15bPhotomontage of the Sewage Treatment Works (STW)
APPENDICES
Appendix 2.1 Horizontal Directional Drilling For Submarine Outfall at Sok Kwu Wan (1, 2)
Appendix 2.3 Details of Consultations with Various Committees (1, 2, 3, 4)
Appendix 3.1 Calculations of Dust Emission Factors
Appendix 3.2 Sample Output File of the FDM Model
Appendix 3.3 Calculation of Odour Emission Factors and Vent Pipe Information
Appendix 3.4 Sample Output File for ISCST3 Model
Appendix 4.1a Preliminary Construction Programme
Appendix 4.2 Assumed Powered Mechanical Equipment for Sewer Construction (Unmitigated)
Appendix 4.3 Assumed Powered Mechanical Equipment for Submarine Outfall Construction (Unmitigated)
Appendix 4.4 Assumed Operation Equipment for Pumping Stations P1a, P1b and P2 (Unmitigated)
Appendix 4.5 Predicted Noise Levels from Construction of Pumping Stations (Unmitigated)
Appendix 4.6 Predicted Noise Levels from Sewer Construction (Unmitigated)
Appendix 4.7 Predicted Noise Levels from Submarine Outfall Construction (Unmitigated)
Appendix 4.11 Predicted Noise Levels from Sewer Construction (With the Use of Quiet Equipment)
Appendix 4.16 Assumed Operation Equipment for Pumping Station P1a (With the use of Silencer)
Appendix 5.3 Calculation of Elevated SS Concentration (Mitigated)
Appendix 5.4 Outline of Emergency Response Plan
Appendix 8.1 Plant Species Recorded Within the Study Area at Sok Kwu Wan
Appendix 8.4Raw Data of Dive Survey in Sok Kwu Wan