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 Project
2.4	Consideration of Alternative Design and Layout
2.5	Consideration of Alternative Construction Methods and Sequences of Work
2.6	Selected of Preferred Scenario
2.7	Effluent Reuse
2.8	Human Health Impacts due to Effluent Reuse
2.9	Project Implementation Programme
2.10	Public Consultations
2.11	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	Identification of Pollution Sources
3.6	Construction Dust Impact Assessment Methodology
3.7	Prediction of Construction Dust Impact
3.8	Operational Phase 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 and Guidelines
4.3	Description of the Existing Noise Environment
4.4	Construction Noise Impact Assessment
4.5	Operational Noise Impact Assessment
4.6	Environmental Monitoring and Audit Requirements
4.7	Conclusion
5	WATER QUALITY IMPACT
5.1	Introduction
5.2	Relevant Legislations, Standards & Guidelines
5.3	Assessment Methodology
5.4	Study Area and Sensitive Receivers
5.5	Baseline Water Quality
5.6	Water Quality Impact Assessment
5.7	Water Pollution Mitigation and Management
5.8	Residual Impacts
5.9	Environmental Monitoring and Audit Requirements
5.10	Conclusion
6	WASTE MANAGEMENT IMPLICATION
6.1	Introduction
6.2	Relevant Legislations, Standards & Guidelines
6.3	Assessment Methodology
6.4	Construction Phase Waste Generation and Potential Impacts
6.5	Operational Phase Waste Generation and Potential Impacts
6.6	Mitigation Measures
6.7	Residual Impacts
6.8	Environmental Monitoring and Audit Requirements
6.9	Conclusion
7	LAND CONTAMINATION
7.1	Introduction
7.2	Relevant Legislation, Standards & Guidelines
7.3	Assessment Methodology
7.4	Baseline Environmental Condition
7.5	Site History
7.6	Review of Environmental Information from the Government
7.7	Identification of Sensitive Receivers
7.8	Identification and Evaluation of Potential Impacts
7.9	Residual Impacts
7.10	Environmental Monitoring and Audit Requirements
7.11	Conclusion
8	ECOLOGY
8.1	Introduction
8.2	Relevant Legislations, 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	Conclusion
8.12	References
9	FISHERIES
9.1	Introduction
9.2	Relevant Legislations, Standards & Guidelines
9.3	Study Area and Sensitive Receivers
9.4	Methodology for Baseline Establishment and Assessment
9.5	Description of Physical Environment Background
9.6	Environmental Impacts to Fisheries
9.7	Mitigation Measures
9.8	Residual Impacts
9.9	Environmental Monitoring and Audit Requirements
9.10	Conclusion
9.11	References
10	CULTURAL HERITAGE
10.1	Introduction
10.2	Relevant Legislations, Standards & Guidelines
10.3	Archaeological Impact Assessment
10.4	Built Heritage Impact Assessment
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 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 CONCLUSIONS
14.1	Key Environmental Outcomes
14.2	Overall Conclusions

List of Figures
Figure 2.1	Proposed Works in Cheung Chau
Figure 2.2	Proposed General Layout of Cheung Chau STW
Figure 2.3	Cheung Chau Sewerage System Alternatives to KYW SPS - Deep Sewer Option
Figure 2.4	Schematic Flow Diagram of Upgraded Cheung Chau STW
Figure 2.5	Layout Plan of Emergency Outfall of Pak She SPS
Figure 3.1	Air Sensitive Receivers (Sheet 1 of 15)
Figure 3.2	Air Sensitive Receivers (Sheet 2 of 15)
Figure 3.3	Air Sensitive Receivers (Sheet 3 of 15)
Figure 3.4	Air Sensitive Receivers (Sheet 4 of 15)
Figure 3.5	Air Sensitive Receivers (Sheet 5 of 15)
Figure 3.6	Air Sensitive Receivers (Sheet 6 of 15)
Figure 3.7	Air Sensitive Receivers (Sheet 7 of 15)
Figure 3.8	Air Sensitive Receivers (Sheet 8 of 15)
Figure 3.9	Air Sensitive Receivers (Sheet 9 of 15)
Figure 3.10	Air Sensitive Receivers (Sheet 10 of 15)
Figure 3.11	Air Sensitive Receivers (Sheet 11 of 15)
Figure 3.12	Air Sensitive Receivers (Sheet 12 of 15)
Figure 3.13	Air Sensitive Receivers (Sheet 13 of 15)
Figure 3.14	Air Sensitive Receivers (Sheet 14 of 15)
Figure 3.15	Air Sensitive Receivers (Sheet 15 of 15)
Figure 3.16	Air Sensitive Receivers Key Plan
Figure 3.17	Location of Proposed Concrete Batching Plant and Emission Sources at Cheung Chau STW
Figure 3.18	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 1.5m above ground (Unmitigated)
Figure 3.19	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 5m above ground (Unmitigated)
Figure 3.20	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 10m above ground (Unmitigated)
Figure 3.21	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 15m above ground (Unmitigated)
Figure 3.22	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 20m above ground (Unmitigated)
Figure 3.23	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 25m above ground (Unmitigated)
Figure 3.24	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 1.5m above ground (Unmitigated)
Figure 3.25	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 5m above ground (Unmitigated)
Figure 3.26	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 10m above ground (Unmitigated)
Figure 3.27	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 15m above ground (Unmitigated)
Figure 3.28	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 20m above ground (Unmitigated)
Figure 3.29	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 25m above ground (Unmitigated)
Figure 3.30	Contour Plot of Annual TSP Concentration in µg/m3 at 1.5m above ground (Unmitigated)
Figure 3.31	Contour Plot of Annual TSP Concentration in µg/m3 at 5m above ground (Unmitigated)
Figure 3.32	Contour Plot of Annual TSP Concentration in µg/m3 at 10m above ground (Unmitigated)
Figure 3.33	Contour Plot of Annual TSP Concentration in µg/m3 at 15m above ground (Unmitigated)
Figure 3.34	Contour Plot of Annual TSP Concentration in µg/m3 at 20m above ground (Unmitigated)
Figure 3.35	Contour Plot of Annual TSP Concentration in µg/m3 at 25m above ground (Unmitigated)
Figure 3.36	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 1.5m above ground (Mitigated)
Figure 3.37	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 5m above ground (Mitigated)
Figure 3.38	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 10m above ground (Mitigated)
Figure 3.39	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 15m above ground (Mitigated)
Figure 3.40	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 20m above ground (Mitigated)
Figure 3.41	Contour Plot of 1-Hour TSP Concentration in µg/m3 at 25m above ground (Mitigated)
Figure 3.42	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 1.5m above ground (Mitigated)
Figure 3.43	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 5m above ground (Mitigated)
Figure 3.44	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 10m above ground (Mitigated)
Figure 3.45	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 15m above ground (Mitigated)
Figure 3.46	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 20m above ground (Mitigated)
Figure 3.47	Contour Plot of 24-Hour TSP Concentration in µg/m3 at 25m above ground (Mitigated)
Figure 3.48	Contour Plot of Annual TSP Concentration in µg/m3 at 1.5m above ground (Mitigated)
Figure 3.49	Contour Plot of Annual TSP Concentration in µg/m3 at 5m above ground (Mitigated)
Figure 3.50	Contour Plot of Annual TSP Concentration in µg/m3 at 10m above ground (Mitigated)
Figure 3.51	Contour Plot of Annual TSP Concentration in µg/m3 at 15m above ground (Mitigated)
Figure 3.52	Contour Plot of Annual TSP Concentration in µg/m3 at 20m above ground (Mitigated)
Figure 3.53	Contour Plot of Annual TSP Concentration in µg/m3 at 25m above ground (Mitigated)
Figure 3.54	Potential Odour Sources Identified in the Pak She SPS
Figure 3.55	Contour Plot of 5-second Odour concentration in OU unit at 1.5m above ground (Unmitigated)
Figure 3.56	Contour Plot of 5-second Odour concentration in OU unit at 5m above ground (Unmitigated)
Figure 3.57	Contour Plot of 5-second Odour concentration in OU unit at 10m above ground (Unmitigated)
Figure 3.58	Contour Plot of 5-second Odour concentration in OU unit at 15m above ground (Unmitigated)
Figure 3.59	Contour Plot of 5-second Odour concentration in OU unit at 20m above ground (Unmitigated)
Figure 3.60	Contour Plot of 5-second Odour concentration in OU unit at 25m above ground (Unmitigated)
Figure 3.61	Contour Plot of 5-second Odour concentration in OU unit at 1.5m above ground (Mitigated)
Figure 3.62	Contour Plot of 5-second Odour concentration in OU unit at 5m above ground (Mitigated)
Figure 3.63	Contour Plot of 5-second Odour concentration in OU unit at 10m above ground (Mitigated)
Figure 3.64	Contour Plot of 5-second Odour concentration in OU unit at 15m above ground (Mitigated)
Figure 3.65	Contour Plot of 5-second Odour concentration in OU unit at 20m above ground (Mitigated)
Figure 3.66	Contour Plot of 5-second Odour concentration in OU unit at 25m above ground (Mitigated)
Figure 4.1	Location of Background Noise Measurement
Figure 4.2	Noise Sensitive Receivers (Sheet 1 of 14)
Figure 4.3	Noise Sensitive Receivers (Sheet 2 of 14)
Figure 4.4	Noise Sensitive Receivers (Sheet 3 of 14)
Figure 4.5	Noise Sensitive Receivers (Sheet 4 of 14)
Figure 4.6	Noise Sensitive Receivers (Sheet 5 of 14)
Figure 4.7	Noise Sensitive Receivers (Sheet 6 of 14)
Figure 4.8	Noise Sensitive Receivers (Sheet 7 of 14)
Figure 4.9	Noise Sensitive Receivers (Sheet 8 of 14)
Figure 4.10	Noise Sensitive Receivers (Sheet 9 of 14)
Figure 4.11	Noise Sensitive Receivers (Sheet 10 of 14)
Figure 4.12	Noise Sensitive Receivers (Sheet 11 of 14)
Figure 4.13	Noise Sensitive Receivers (Sheet 12 of 14)
Figure 4.14	Noise Sensitive Receivers (Sheet 13 of 14)
Figure 4.15	Noise Sensitive Receivers (Sheet 14 of 14)
Figure 4.16	Cheung Chau Sewage Treatment Works Location of Operational Fixed Plant Noise Source
Figure 5.1	Water Sensitive Receivers
Figure 5.1a	Layout Plan of Submarine Outfall and Emergency Outfall of Cheung Chau STW
Figure 5.2	Model Output Locations
Figure 7.1	Potential Contaminated Site
Figure 7.2	Year 1924 Aerial Photo Photo No: 16
Figure 7.3	Year 1977 Aerial Photo Photo No: 18327
Figure 7.4	Year 1980 Aerial Photo Photo No: 29188
Figure 7.5	Year 1984 Aerial Photo Photo No: 57247
Figure 7.6	Year 1990 Aerial Photo Photo No: A20681
Figure 7.7	Year 1996 Aerial Photo Photo No: A43432
Figure 7.8	Year 2011 Aerial Photo Photo Nos: CW89340 & CW89559
Figure 8.1	Site of Conservation Importance within Southern Water Control Zone
Figure 8.2	Distribution of Finless Porpoise Sightings in Marine Ecological Assessment Area in 2012-2013
Figure 9.1	Distribution of Adult Fish Production
Figure 9.2	Distribution of Fish Fry Production
Figure 9.3	The Value of Fisheries Production
Figure 9.4	Zones for Culture Fisheries in Hong Kong
Figure 9.5	Important Spawning Ground for Commercial Species in Hong Kong
Figure 9.6	Important Nursery Ground for Commercial Species in Hong Kong
Figure 10.1	Location of Site of Archaeological Interest - Key Plan
Figure 10.2	Location of Tung Wan Site of Archaeological Interest and Cheung Chau Rock Carving
Figure 10.3	Location of Tai Kwai Wan Site of Archaeological Interest
Figure 10.4	Location of Sai Wan Site of Archaeological Interest
Figure 10.5	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 1 of 15)
Figure 10.6	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 2 of 15)
Figure 10.7	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 3 of 15)
Figure 10.8	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 4 of 15)
Figure 10.9	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 5 of 15)
Figure 10.10	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 6 of 15)
Figure 10.11	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 7 of 15)
Figure 10.12	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 8 of 15)
Figure 10.13	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 9 of 15)
Figure 10.14	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 10 of 15)
Figure 10.15	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 11 of 15)
Figure 10.16	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 12 of 15)
Figure 10.17	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 13 of 15)
Figure 10.18	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 14 of 15)
Figure 10.19	Assessment of Archaeological Potential within Project in Cheung Chau (Sheet 15 of 15)
Figure 10.20	Location of Built Heritage Resources (Sheet 1 of 15)
Figure 10.21	Location of Built Heritage Resources (Sheet 2 of 15)
Figure 10.22	Location of Built Heritage Resources (Sheet 3 of 15)
Figure 10.23	Location of Built Heritage Resources (Sheet 4 of 15)
Figure 10.24	Location of Built Heritage Resources (Sheet 5 of 15)
Figure 10.25	Location of Built Heritage Resources (Sheet 6 of 15)
Figure 10.26	Location of Built Heritage Resources (Sheet 7 of 15)
Figure 10.27	Location of Built Heritage Resources (Sheet 8 of 15)
Figure 10.28	Location of Built Heritage Resources (Sheet 9 of 15)
Figure 10.29	Location of Built Heritage Resources (Sheet 10 of 15)
Figure 10.30	Location of Built Heritage Resources (Sheet 11 of 15)
Figure 10.31	Location of Built Heritage Resources (Sheet 12 of 15)
Figure 10.32	Location of Built Heritage Resources (Sheet 13 of 15)
Figure 10.33	Location of Built Heritage Resources (Sheet 14 of 15)
Figure 10.34	Location of Built Heritage Resources (Sheet 15 of 15)
Figure 11.1	Location of Landscape Resource
Figure 11.2	Location of Landscape Character Areas
Figure 11.3	Location of Visually Sensitive Receivers and Visual Envelop
Figure 11.4	Photo of Landscape Resources, Landscape Character Areas and Visually Sensitive Receivers (Sheet 1 of 3)
Figure 11.5	Photo of Landscape Resources, Landscape Character Areas and Visually Sensitive Receivers (Sheet 2 of 3)
Figure 11.6	Photo of Landscape Resources, Landscape Character Areas and Visually Sensitive Receivers (Sheet 3 of 3)
Figure 11.7	Photomontage of the Proposed Cheung Chau STW (View from VSR1)
Figure 11.8	Photomontage of the Proposed Cheung Chau STW (View from VSR2)
Figure 11.9	Photomontage of the Proposed Cheung Chau STW (View from VSR3)
Figure 11.10	Photomontage of the Proposed Cheung Chau STW (View from VSR4)
Figure 11.11	Photomontage of the Proposed Cheung Chau STW (View from VSR5)

List of Appendices

Appendix 3.1 Odour Survey Results

Appendix 3.2 TSP Emissions Factors Calculations

Appendix 3.3 TSP Modelling Output File Sample

Appendix 3.4 Odour Emissions Factors Calculations

Appendix 3.5 Odour Modelling Output File Sample

Appendix 3.6 Correspondences with Interfacing Projects

Appendix 4.1 Construction Plant Inventory – Unmitigated Scenario

Appendix 4.2 Photographs of 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 Detailed Calculation of Construction Stage Noise Levels at Representative NSRs – Mitigated Scenario

Appendix 4.7 Detailed Calculation of Operation Noise Levels at Representative NSRs – Unmitigated Scenario

Appendix 4.8 Detailed Calculation of Operation Noise Levels at Representative NSRs – Mitigated Scenario

Appendix 5A Details on Hydrodynamic and Water Quality Modelling

Appendix 5B Pollution Loads Calculations

Appendix 5C Output Figures from Water Quality Modelling

Appendix 7.1 Correspondences with Government Department for Potential Land Contamination Sites

Appendix 8.1 Ecological Baseline Survey Report

Appendix 10.1 Methodology for Archaeological Watching Brief

Appendix 10.2 Built Heritage Catalogue

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 Proposed Tree Planting Plan of Cheung Chau STW