TABLE OF CONTENTS
Page
1.1 Project
...................................................................................................................................... 1-1
1.2 Objectives
of EIA Study............................................................................................................ 1-1
1.3 Consideration
of Environmental Impact Assessment Ordinance................................................... 1-2
1.4 EIA
Study Area......................................................................................................................... 1-2
1.5 Structure
of the EIA Report........................................................................................................ 1-3
2.1 Project
Location........................................................................................................................ 2-1
2.2 Project
Requirement and Scope................................................................................................. 2-1
2.3 Water
Treatment Process for Siu Ho Wan WTW Extension........................................................ 2-2
2.4 Alternative
Site for Siu Ho Wan Raw Water Booster Pumping Station......................................... 2-2
2.5 Alternative
Alignments for Duplication Pipeline at Pui O.............................................................. 2-5
2.6 Proposed
Water Treatment Process............................................................................................ 2-6
2.7 Project
Programme.................................................................................................................... 2-9
2.8 Interaction
with Other Projects................................................................................................... 2-9
3.1 Introduction............................................................................................................................... 3-1
3.2 Environmental
Legislation and Standards..................................................................................... 3-1
3.3 Description
of the Environment................................................................................................... 3-2
3.4 Air
Sensitive Receivers............................................................................................................... 3-2
3.5 Assessment
Methodology........................................................................................................... 3-3
3.6 Identification
of Environmental Impacts....................................................................................... 3-5
3.7 Prediction
and Evaluation of Environmental Impacts ................................................................... 3-5
3.8 Mitigation
of Adverse Environmental Impacts.............................................................................. 3-6
3.9 Evaluation
of Residual Impacts................................................................................................... 3-7
3.10 Environmental
Monitoring and Audit........................................................................................... 3-7
4.1 Introduction............................................................................................................................... 4-1
4.2 Environmental
Legislation, Policies, Plans, Standards and Criteria................................................ 4-1
4.3 Description
of the Environment................................................................................................... 4-4
4.4 Noise
Sensitive Receivers........................................................................................................... 4-5
4.5 Assessment
Methodology........................................................................................................... 4-6
4.6 Identification
of Environmental Impacts....................................................................................... 4-7
4.7 Prediction
and Evaluation of Environmental Impacts.................................................................... 4-8
4.8 Mitigation
of Adverse Environmental Impacts............................................................................ 4-10
4.9 Evaluation
of Residual Impacts................................................................................................. 4-12
4.10 Environmental
Monitoring and Audit......................................................................................... 4-13
5.1 Introduction............................................................................................................................... 5-1
5.2 Environmental
Legislation and Standards..................................................................................... 5-1
5.3 Baseline
Conditions.................................................................................................................... 5-6
5.4 Water
Sensitive Receivers.......................................................................................................... 5-6
5.5 Assessment
Methodology........................................................................................................... 5-7
5.6 Identification
and Initial Evaluation of Environmental Impacts....................................................... 5-7
5.7 Mitigation
Measures................................................................................................................... 5-9
5.8 Environmental
Monitoring and Audit......................................................................................... 5-10
5.9 Residual
Environmental Impacts................................................................................................ 5-10
6.1 Introduction............................................................................................................................... 6-1
6.2 Environmental
Legislation and Standards..................................................................................... 6-1
6.3 Assessment
Methodology & Criteria.......................................................................................... 6-2
6.4 Baseline
Condition..................................................................................................................... 6-4
6.5 Ecological
Value....................................................................................................................... 6-11
6.6 Identification
of Environmental Impacts..................................................................................... 6-15
6.7 Evaluation
of Impacts............................................................................................................... 6-17
6.8 Cumulative
Impacts.................................................................................................................. 6-22
6.9 Mitigation
of Adverse Environmental Impacts............................................................................ 6-22
6.10 Residual
Environmental Impacts................................................................................................ 6-23
6.11 Environmental
Monitoring and Auditing Requirements............................................................... 6-23
6.12 References............................................................................................................................... 6-24
7.1 Introduction............................................................................................................................... 7-1
7.2 Project Description.................................................................................................................... 7-1
7.3 Review of Planning and Development Control Framework.......................................................... 7-2
7.4 Environmental
Legislation and Standards..................................................................................... 7-3
7.5 Assessment
Methodology........................................................................................................... 7-3
7.6 Baseline
Study......................................................................................................................... 7-10
7.7 Landscape
Impact Assessment (LIA)....................................................................................... 7-17
7.8 Visual Impact Assessment (VIA).............................................................................................. 7-26
7.9 Landscape and Visual Impact Mitigation Measures................................................................... 7-33
7.10 Residual Landscape and Visual Impacts.................................................................................... 7-36
7.11 Funding, Implementation, Management and Maintenance.......................................................... 7-42
8.1 Introduction............................................................................................................................... 8-1
8.2 Environmental
Legislation and Standards..................................................................................... 8-1
8.3 Description
of the Environment................................................................................................... 8-2
8.4 Assessment
Methodology........................................................................................................... 8-2
8.5 Results
of the Desk-Based Study................................................................................................ 8-4
8.6 Results
of Field Evaluation.......................................................................................................... 8-6
8.7 Impact
Assessment.................................................................................................................... 8-8
8.8 Evaluation
of Impacts: Operation Phase.................................................................................... 8-11
8.9 Mitigation
Measures................................................................................................................. 8-16
8.10 Residual
Environmental Impact................................................................................................. 8-17
8.11 Environmental
Monitoring and Audit Requirements.................................................................... 8-17
9.1 Introduction............................................................................................................................... 9-1
9.2
Rationale of HAZOP Study........................................................................................................ 9-1
9.3
Risk Guidelines.......................................................................................................................... 9-2
9.4
Approach of HAZOP Study....................................................................................................... 9-3
9.5
Description of Site
Conditions and Possible Construction Activities............................................. 9-4
9.6
HAZOP Study......................................................................................................................... 9-11
9.7
Findings and Recommendations................................................................................................ 9-12
10.1 Introduction............................................................................................................................. 10-1
10.2 Environmental
Legislation and Standards................................................................................... 10-1
10.3 Assessment
Methodology and Criteria...................................................................................... 10-3
10.4 Identification
and Evaluation of Environmental Impact................................................................ 10-3
10.5 Mitigation
Measures................................................................................................................. 10-6
10.6 Evaluation
of Residual Impacts................................................................................................. 10-8
10.7 Environmental
Audit................................................................................................................. 10-8
11.
ENVIRONMENTAL MONITORING AND AUDIT.........................................................
11-1
11.1 Introduction.............................................................................................................................. 11-1
11.2 Air
Quality Impact.................................................................................................................... 11-1
11.3 Noise
Impact........................................................................................................................... 11-2
11.4 Water
Quality Impact............................................................................................................... 11-2
11.5 Ecology.................................................................................................................................... 11-3
11.6 Landscape
and Visual Impact................................................................................................... 11-3
11.7 Cultural
and Heritage................................................................................................................ 11-4
11.8 Waste
Management.................................................................................................................. 11-4
12.1 Introduction............................................................................................................................. 12-1
12.2 Air
Quality Impact.................................................................................................................... 12-1
12.3 Noise
Impact........................................................................................................................... 12-1
12.4 Water
Quality Impact............................................................................................................... 12-1
12.5 Ecology................................................................................................................................... 12-2
12.6 Landscape
and Visual Impact................................................................................................... 12-2
12.7 Cultural
Heritage...................................................................................................................... 12-3
12.8 Hazard to Life.......................................................................................................................... 12-3
12.9 Waste
Management.................................................................................................................. 12-3
12.10 Environmental Monitoring and Audit....................................................................................... 12-4
12.11 Overall Conclusion................................................................................................................. 12-4
List of Tables
Table 2.1....... Engineering
Considerations of Siu Ho Wan Raw Water Booster Pumping Station Alternative Site
Options 2-3
Table 2.2....... Environmental Considerations of
Siu Ho Wan Raw Water Booster Pumping Station Alternative Site Options 2-4
Table 2.3....... Environmental Considerations of
Alternative Raw Water Main Alignments at Pui O........ 2-5
Table 2.4....... Changes of Water Treatment
Process for Extended Siu Ho Wan WTW......................... 2-6
Table 2.5 Benefits and Potential Disadvantages of
the Proposed Water Treatment Process for Manganese Removal 2-7
Table 2.6 Benefits and Potential Disadvantages of
the Proposed Water Treatment Process for Primary Disinfection 2-7
Table 2.7 ...... Hazardous Properties of Chlorine,
Ozone and Potassium Permanganate........................ 2-8
Table 3.1....... Hong Kong Air Quality Objectives............................................................................... 3-1
Table 3.2....... Summary of Representative Air
Sensitive Receivers...................................................... 3-2
Table 3.3....... Emission Factors for Dusty Construction Activities........................................................ 3-3
Table 3.4....... Predicted TSP Concentration at
the Representative ASRs at 1.5m above Ground Level 3-6
Table 4.1....... Area Sensitivity Ratings................................................................................................ 4-2
Table 4.2....... Construction Noise Criteria for
Activity other than Percussive Piling.............................. 4-2
Table 4.3....... Acceptable Noise Levels (ANLs) (dB(A))................................................................... 4-3
Table
4.4....... Noise Criteria for Operation Noise Impact due to New
Proposed Equipment................ 4-4
Table 4.5....... Representative Noise Sensitive
Receivers..................................................................... 4-5
Table
4.6....... Predicted Construction
Noise Levels– Unmitigated Scenario ........................................ 4-8
Table
4.7....... Predicted Unmitigated
Operation Noise Levels from Pui O Raw
Water Pumping Station & Pui O No. 2 Raw Water Pumping Station 4-10
Table
4.8....... Predicted Construction
Noise Levels – Mitigated Scenario ......................................... 4-11
Table 4.9....... Predicted Mitigated Operation
Noise Levels from Pui O Raw Water Pumping Station & Pui O No.2 Raw Water
Pumping Station 4-12
Table 5.1....... Water Quality Objectives for
North Western Water Control Zone................................. 5-2
Table 5.2....... Water Quality Objectives for
Southern Water Control Zone.......................................... 5-4
Table 6.1a .... Ecological Value of Woodland and Abandoned
Agricultural Land Habitat.................... 6-11
Table 6.1b .... Ecological Value of Tall Shrubland
Grassland/Shrubland Mixture Habitat..................... 6-12
Table 6.1c .... Ecological Value of Streams and
Plantation Habitat..................................................... 6-12
Table 6.1d .... Ecological Value of Active
Agricultural Land, Village/Developed Area, Wasteland/Abandoned Area and
Backshore Vegetation Habitat.................................................................................................................................. 6-13
Table 6.1e .... Ecological Value of Mangrove/Mudflat
and Sandy/Rocky Shore Habitat...................... 6-13
Table
6.2 ...... Species of Conservation
Interest Recorded in the Assessment Area............................ 6-15
Table 6.3....... Habitats Directly Affected by the
Laying of Raw Water Mains at Pui O....................... 6-16
Table
6.4a..... Overall Impact Evaluation
of Woodland and Abandoned Agricultural
Land Habitat...... 6-17
Table 6.4b..... Overall Impact Evaluation of Tall
Shrubland Grassland/Shrubland Mixture Habitat....... 6-18
Table 6.4c..... Overall Impact Evaluation of
Streams and Plantation Habitat....................................... 6-18
Table 6.4d..... Overall Impact Evaluation of Active
Agricultural Land, Village/Developed Area, Wasteland/Abandoned Area and
Backshore Vegetation Habitat....................................................................................................................... 6-19
Table 6.4e..... Overall Impact Evaluation of
Mangrove/Mudflat and Sandy/Rocky Shore Habitat....... 6-19
Table 6.5....... Overall Impact Evaluation to
Species of Conservation Interest..................................... 6-21
Table 7.1....... Illustration of the Sensitivity
of LRs in Siu Ho Wan....................................................... 7-11
Table 7.2....... VSRs in Siu Ho Wan.................................................................................................. 7-12
Table 7.2a..... Illustration of the Sensitivity of
LRs in Pui O................................................................ 7-14
Table 7.3....... VSRs in Pui O........................................................................................................... 7-16
Table 7.4....... Landscape Impacts of LCA 1 in Siu
Ho Wan without mitigation measures................... 7-17
Table 7.5....... Landscape Impacts of LCA 2 in Siu
Ho Wan without mitigation measures................... 7-17
Table 7.6....... Landscape Impacts of LCA 3 in Siu
Ho Wan without mitigation measures................... 7-17
Table 7.7 ...... Landscape Impacts of LCA 4 in Siu
Ho Wan without mitigation measures................... 7-17
Table 7.8 ...... Summary of Landscape Impacts on
LCAs in Siu Ho Wan without Mitigation Measures 7-18
Table 7.8a .... Landscape Impacts of LR 1 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-18
Table 7.8b .... Landscape Impacts of LR 2 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-18
Table 7.8c .... Landscape Impacts of LR 3 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-19
Table 7.8d .... Landscape Impacts of LR 4 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-19
Table 7.8e .... Landscape Impacts of LR 5 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-19
Table 7.8f ..... Landscape Impacts of LR 6 in Siu Ho
Wan without Mitigation Measures (Construction and Operation Stages) 7-19
Table 7.8g .... Summary of Landscape Impacts on LRs
in Siu Ho Wan without Mitigation Measures.. 7-20
Table 7.9 ...... Landscape Impacts of LCA 1 in Pui
O without mitigation measures (Construction and Operation Stages) 7-20
Table 7.10..... Landscape Impacts of LCA 2 in Pui O
without mitigation measures (Construction and Operation Stages) 7-20
Table 7.11..... Landscape Impacts of LCA 3 in Pui O
without mitigation measures (Construction and Operation Stages) 7-21
Table 7.12..... Landscape Impacts of LCA 4 in Pui O
without mitigation measures (Construction and Operation Stages) 7-21
Table 7.13..... Landscape Impacts of LCA 5 in Pui O
without mitigation measures (Construction and Operation Stage) 7-21
Table 7.14..... Landscape Impacts of LCA 6 in Pui O
without mitigation measures (Construction and Operation Stage) 7-21
Table 7.15..... Landscape Impacts of LCA 7 in Pui O
without mitigation measures (Construction Stage) 7-21
Table 7.16..... Landscape Impacts of LCA 7 in Pui O
without mitigation measures (Operation Stage). 7-22
Table 7.17..... Landscape Impacts of LCA 8 in Pui O
without mitigation measures (Construction and Operation Stage) 7-22
Table 7.18 .... Summary of Landscape Impacts on LCAs
in Pui O without Mitigation Measures......... 7-22
Table 7.19 .... Landscape Impacts of LR 1 in Pui O
without Mitigation Measures (Construction Stage) 7-23
Table 7.20 .... Landscape Impacts of LR 1 in Pui O
without Mitigation Measures (Operation Stage).. 7-23
Table 7.21 .... Landscape Impacts of LR 2 in Pui O
without Mitigation Measures (Construction Stage) 7-23
Table 7.22 .... Landscape Impacts of LR 2 in Pui O
without Mitigation Measures (Operation Stage).. 7-23
Table 7.23 .... Landscape Impacts of LR 3 in Pui O
without Mitigation Measures (Construction Stage) 7-24
Table 7.24 .... Landscape Impacts of LR 3 in Pui O
without Mitigation Measures (Operation Stage).. 7-24
Table 7.25 .... Landscape Impacts of LR 4 in Pui O
without Mitigation Measures (Construction and Operation Stages) 7-24
Table 7.26 .... Landscape Impacts of LR 5 in Pui O
without Mitigation Measures (Construction Stage) 7-24
Table 7.27 .... Landscape Impacts of LR 5 in Pui O
without Mitigation Measures (Operation Stage).. 7-24
Table 7.28 .... Landscape Impacts of LR 6 in Pui O
without Mitigation Measures (Construction and Operation Stages) 7-24
Table 7.29 .... Landscape Impacts of LR 7 in Pui O
without Mitigation Measures (Construction and Operation Stages) 7-25
Table 7.30 .... Landscape Impacts of LR 8 in Pui O
without Mitigation Measures (Construction Stage) 7-25
Table 7.31 .... Landscape Impacts of LR 8 in Pui O
without Mitigation Measures (Operation Stage).. 7-25
Table 7.32 .... Landscape Impacts of LR 9 in Pui O
without Mitigation Measures (Construction and Operation Stages) 7-25
Table 7.33 .... Landscape Impacts of LR 10 in Pui O
without Mitigation Measures (Construction and Operation Stages) 7-25
Table 7.34 .... Summary of Landscape Impacts on LRs
in Pui O without Mitigation Measures............ 7-26
Table 7.35..... The Sensitivity of the VSRs in Siu
Ho Wan................................................................. 7-26
Table 7.36..... Identification of the Magnitude of
Change for the VSRs in Siu Ho Wan........................ 7-27
Table 7.37 .... Visual Impact Assessment of the VSRs
in Siu Ho Wan without Mitigation Measures.... 7-29
Table 7.38..... The Sensitivity of the VSRs in Pui
O........................................................................... 7-30
Table 7.39..... Identification of the Magnitude of
Change for the VSRs in Pui O................................. 7-31
Table 7.40 .... Visual Impact Assessment of the VSRs
in Pui O without Mitigation Measures.............. 7-32
Table 7.41..... Residual Landscape Impacts on LCAs
in Siu Ho Wan with Mitigation Measures......... 7-37
Table 7.42..... Residual Landscape Impacts on LRs
in Siu Ho Wan with Mitigation Measures............ 7-37
Table 7.43 .... Residual Landscape Impacts on LCAs
in Pui O with Mitigation Measures................... 7-37
Table 7.44 .... Residual Landscape Impacts on LRs in
Pui O with Mitigation Measures...................... 7-38
Table 7.45..... Residual Visual Impact of the VSRs
in Siu Ho Wan with Mitigation Measures.............. 7-39
Table 7.46..... Residual Visual Impact of the VSRs
Pui O with Mitigation Measures........................... 7-40
Table 9.1....... Construction Activities and
Corresponding Plants/equipment Discussed in HAZOP Study Meeting 9-5
Table 9.2....... Interface between Construction
Activities and the Chlorine Building ............................ 9-13
Table 9.3....... Summary of Identified Possible
Deviation Causes ....................................................... 9-14
Table 9.4....... Summary of Hazardous Scenarios
leading to Chlorine Leakage/release........................ 9-14
Table 9.5....... Summary of Mitigation Measures to
Avoid Occurrence of Deviations and Corresponding Responsible Parties 9-15
Table
10.1..... Summary of C&D
Material Volumes from Excavation Works...................................... 10-4
Table 12.1..... Summary of Key Environmental
Outcomes/Benefits.................................................... 12-4
Table
13.1..... Implementation Schedule
for Air Quality Control (Designated
Project)........................ 13-2
Table
13.2..... Implementation Schedule
for Water Quality Control (Designated
Project).................... 13-4
Table
13.3..... Implementation Schedule
for Ecology (Designated Project)......................................... 13-6
Table 13.4..... Implementation Schedule for
Landscape and Visual Impact (Designated Project)........ 13-8
Table 13.5..... Implementation Schedule for Waste
Management (Designated Project)....................... 13-9
Table 13.6..... Implementation Schedule for Air
Quality Control (Non-Designated Project).............. 13-12
Table 13.7..... Implementation Schedule for Noise
Control (Non-Designated Project)...................... 13-14
Table 13.8..... Implementation Schedule for Water
Quality Control (Non-Designated Project).......... 13-16
Table 13.9..... Implementation Schedule for Ecology
(Non-Designated Project)............................... 13-18
Table 13.10... Implementation Schedule for
Landscape and Visual Impact (Non-Designated Project) 13-20
Table 13.11... Implementation Schedule for Cultural
Heritage Impact (Non-Designated Project)...... 13-22
Table 13.12... Implementation Schedule for Waste
Management (Non-Designated Project)............. 13-23
List of Figures
Figure 2.1.............. Location of Project Works
at Siu Ho Wan
Figure 2.2.............. Layout Plan of Siu Ho Wan
WTW Extension
Figure 2.3.............. Location of Project Works
at Pui O
Figure 2.4.............. Process Flow Diagram of Proposed
Process
Figure 2.5.............. Preliminary Construction
Programme
Figure 3.1a............ Locations of Representative
Air Sensitive Receivers (Sheet 1 of 2)
Figure 3.1b............ Locations of Representative
Air Sensitive Receivers (Sheet 2 of 2)
Figure 4.1.............. Locations of Representative
Noise Sensitive Receivers at Pui O
Figure 5.1.............. Locations of Water Sensitive
Receivers at Pui O
Figure 5.2.............. Locations of Water Sensitive
Receivers at Siu Ho Wan
Figure 6.1.............. Habitat Map of Siu Ho Wan
Figure 6.2a............ Habitat Map of Pui O (Sheet
1 of 3)
Figure 6.2b............ Habitat Map of Pui O (Sheet
2 of 3)
Figure 6.2c............ Habitat Map of Pui O (Sheet
3 of 3)
Figure 7.1a............ Baseline Study – Landscape
Character Area of Siu Ho Wan (Sheet 1 of 2)
Figure 7.1b............ Baseline Study – Landscape
Character Area of Pui O (Sheet 2 of 2)
Figure 7.2a............ Baseline Study – Landscape
Resources of Siu Ho Wan (Sheet 1 of 2)
Figure 7.2b............ Baseline Study – Landscape
Resources of Pui O (Sheet 2 of 2)
Figure 7.3a............ Baseline Study – Landscape
Photographic Record of Siu Ho Wan (Sheet 1 of 2)
Figure 7.3b............ Baseline Study – Landscape
Photographic Record of Siu Ho Wan (Sheet 2 of 2)
Figure 7.3c............ Baseline Study – Landscape
Photographic Record of Pui O (Sheet 1 of 3)
Figure 7.3d............ Baseline Study – Landscape
Photographic Record of Pui O (Sheet 2 of 3)
Figure 7.3e............ Baseline Study – Landscape
Photographic Record of Pui O (Sheet 3 of 3)
Figure 7.5a1.......... Landscape Impact in Siu Ho Wan
Figure 7.5a............ Landscape Impact in Pui O (Sheet
1 of 4)
Figure 7.5b............ Landscape Impact in Pui O (Sheet
2 of 4)
Figure 7.5c............ Landscape Impact in Pui O (Sheet
3 of 4)
Figure 7.5d............ Landscape Impact in Pui O (Sheet
4 of 4)
Figure 7.6a............ Visual Impact – Key View 1
Figure 7.6aa.......... Visual Impact – Key View 1a
Figure 7.6b............ Visual Impact – Key View 2
Figure 7.6c............ Visual Impact – Key View 3
Figure 7.7a............ Mitigation Measures – SHW
Figure 7.7aa.......... Mitigation Measures – SHW
Figure 7.7b............ Mitigation Measures – SHW
Figure 7.7c............ Mitigation Measures – Pui O
Figure 7.7d............ Proposed Landscape and Visual
Mitigation Measures in Siu Ho Wan
Figure 7.7e............ Proposed Landscape and Visual
Mitigation Measures in Pui O
Figure 7.8a............ Residual Visual Impact – Key
View 1
Figure 7.8aa.......... Residual Visual Impact – Key
View 1a
Figure 7.8b............ Residual Visual Impact – Key
View 2
Figure 7.8c............ Residual Visual Impact – Key
View 3
Appendices
Appendix
3.1........ Calculations of Emission Rate at
Pui O
Appendix
4.1........ Baseline Noise Survey Data
Appendix
4.2........ Construction Noise Impact Assessment
Appendix
4.3........ Operation Noise Impact Assessment
Appendix
6.1........ Representative Photographs of Habitats
Recorded in the Assessment Areas
Appendix
6.3........ Plant Species Recorded in the Assessment
Area
Appendix
6.4........ Fauna recorded in the Assessment
Area
Appendix
8.1 ....... Built Heritage Catalogue
Appendix
8.2 ....... Built Heritage Figures
Appendix
8.3........ Archaeology Figures
Appendix
9.1........ Implementation Schedule of Mitigation
Measures Recommended in HAZOP Study