Highways Department
Major Works Project Management
Office
Agreement
No. CE 88/98
Improvement to Castle Peak Road
between Ka Loon Tsuen and Siu Lam
Investigation Assignment
ENVIRONMENTAL
IMPACT ASSESSMENT REPORT
August
2001
Maunsell Consultants Asia Ltd.
in
association with
Maunsell
Environmental Management Consultants Ltd.
Design
Research Unit HK Ltd.
TABLE OF CONTENT
1 INTRODUCTION
Project Background
Objectives of the EIA Study
The Approach
Report Structure
2
DESCRIPTION
OF THE PROJECT
Introduction
PPFS Road Alignment
Alternative Road Alignment
Preliminary Design of Road Alignment
Proposed Road Alignment from Ka Loon Tsuen to Tai Lam Kok
Proposed Roundabout Layout at Tai Lam Kok
Proposed Viaduct from Tai Lam Kok to Siu Lam
Proposed Roundabout at Siu Lam Interchange
Environmental Considerations of PPFS and Proposed Alignments
The EIA Study Area
Construction Activities
Traffic Forcasts
Concurrent Projects
3
AIR
QUALITY IMPACT
Introduction
Environmental Legislation, Policies, Plans, Standards, Guidelines and Criteria
Description of the Environment
Air Sensitive Receivers (ASRs)
Assessment Methodologies
Environmental Impact Identification, Prediction and Evaluation
Mitigation of Adverse Environmental Impacts
Evaluation of Residual Impacts
Environmental Monitoring and Audit
Conclusion
Introduction
Environmental Legislation, Standards and Guidelines
Description of the Environment
Noise Sensitive Receivers
Assessment Methodology
Identification of Impacts
Prediction and Evaluation of Impacts
Mitigation of Adverse Environmental Impacts
Evaluation of Residual Environmental Impacts
Construction Activities during Restricted Hours
Environmental Monitoring and Audit
Conclusion
Introduction
Environmental Legislation, Standards and Guidelines
Description of the Environment
Assessment Methodology
Identification of Impacts
Prediction and Evaluation of Impacts
Mitigation of Adverse Environmental Impacts
Evaluation of Residual Environmental Impacts
Environmental Monitoring and Audit
Conclusion
6
WASTE
MANAGEMENT IMPLICATIONS
Introduction
Environmental Legislation, Standards and Guidelines
Assessment Methodology
Baseline Conditions
Identification of Impacts
Prediction and Evaluation of Environmental Impacts
Mitigation of Adverse Environmental Impacts
Imported Fill
Summary of Wastes Generated and Imported Fill
Residual Environmental Impacts
Environmental Monitoring and Audit
Conclusion
7
TERRESTRIAL AND MARINE
ECOLOGY
Introduction
Environmental Legislation, Standards and Guidelines
Terrestrial Ecology
Marine Ecology
8
FISHERIES
Introduction
Legislation and Guidelines
Description of the Environment
Fisheries Resource Importance
Assessment Methodology
Identification of Impacts
Impact Evaluation
Mitigation of Adverse Environmental Impacts
Environmental Monitoring and Audit
Conclusion
9
LANDSCAPE AND VISUAL
IMPACTS
Preamble
Objectives of the LVIA
LVIA Methodology
Project Description
Baseline Study of Landscape and Visual Resources
Review of Planning and Development Control Framework
Assessment of Landscape and Visual Impacts
Recommended Landscape Mitigation Measures
Residual Impacts and Acceptability of Development
Conclusion
10
ENVIRONMENTAL
MONITORING AND AUDIT
Introduction
Air Quality Impact
Noise Impact
Water Quality Impact
Waste Management Implications
Ecological Impact
Fisheries Impact
Landscape & Visual Impact
11
CONCLUSIONS AND RECOMMENDATIONS
Introduction
Air Quality Impact
Noise Impact
Water Quality Impact
Waste Management Implications
Ecological Impact
Fisheries Impact
Landscape and Visual Impact
Overall Conclusion
12
IMPLEMENTATION SCHEUDLE OF RECOMMENDED MITIGATION
List of Tables
Table 3.1 Hong Kong Air Quality Objectives
Table 3.2 Tunnel Air Quality Criteria
Table 3.3 Air Pollutant Levels Recorded at EPD’s Air Quality Monitoring Station (Tsuen Wan)
Table 3.4 Description of the Air Sensitive Receivers
Table 3.5 Dust Emission Factors used for Castle Peak Road New Link Assessment
Table 3.6 A Comparison of Combined Effects of Traffic Flow and Emission Factors on Castle Peak Road New Link
Table 3.7 Predicted Cumulative TSP Concentrations at the Representative ASRs at 1.5m above Ground (Unmitigated)
Table 3.8 Predicted Cumulative TSP Concentrations at the Representative ASRs at 10m above Ground (Unmitigated)
Table 3.9 Predicted 1-hour Average NO2 Concentrations at the Representative ASRs at various levels above ground
Table 3.10 Predicted 24-hour average NO2 Concentrations at the Representative ASRs at various levels above ground
Table 3.11 Predicted 24-hour Average RSP Concentrations at the Representative ASRs at various levels above ground
Table 3.12 Predicted NO2 Concentration inside the full enclosures
Table 3.13 Predicted TSP Concentrations at the Representative ASRs at 1.5 m above Ground (Mitigated)
Table 3.14 Predicted TSP Concentrations at the Representative ASRs at 10m above Ground (Mitigated)
Table 4.1 Construction Noise Criteria for Activity other than Percussive Piling
Table 4.2 Acceptable Noise Levels for Percussive Piling
Table 4.3 Permitted Hours of Operation for Percussive Piling
Table 4.4 Summary of Representative Noise Sensitive Receivers for Construction Noise Impact Assessment
Table 4.5 Summary of Representative Noise Sensitive Receivers for Traffic Noise Impact Assessment
Table 4.6 Potential Traffic Noise Impacts
Table 4.7 Duration of Exceedance of Noise Criterion for School during Examination Period
Table 4.8 Summary of Maximum Cumulative Construction Noise Levels at the Representative NSRs
Table 4.9 Effectiveness of Recommended Mitigation Measures
Table 4.10 Construction Noise Levels at Represntative NSRs During Restricted Hours (Unmitigated)
Table 4.11 Construction Noise Levels at Representative NSRs During Restricted Hours (Mitigated)
Table 5.1 Water Quality Objectives Statement for North Western WCZ
Table 5.2 Summary Statistics of Marine Water Quality at NM1 and NM2 for 1998
Table 5.3 Ambient and Allowable Elevation in Suspended Sediment Concentrations (mgL-1)
Table 5.4 Predicted Elevation in Suspended Sediment Concentrations (Non-cumulative and Unmitigated Scenario)
Table 5.5 Maximum Predicted Cumulative Elevations in Suspended Sediment Concentration at Ma Wan Fish Culture Zone (Unmitigated Scenario)
Table 5.6 Marine Site Investigation Sediment Elutriate Test Results
Table 5.7 Calculation of the Effects of Increased Suspended Sediment Concentrations on Total Inorganic Nitrogen Concentrations
Table 5.8 Calculation of the Effects of Increased Suspended Sediment Concentrations on Unionised Ammoniacal Nitrogen Concentrations
Table 5.9 Predicted Elevation in Suspended Sediment Concentrations (Non-cumulative and Mitigated Scenario)
Table 6.1 Sediment Criteria under the New Classification System
Table 6.2 Sediment Quality Analysis Results from Marine Ground Investigation Works
Table 6.3 Results
of Testing of TBT in Interstitial Water
Table 6.4 Summary of Wastes Generated
Table 6.5 Summary of Imported Fill
Table 7.1 Evaluation of Floral Species with Ecological Interest within Study Area
Table 7.2 Summary of Compensatory Woodland and Amenity Planting
Table 8.1 Production by Fishing Area (all fishing vessels)
Table 8.2 Top Ten Adult Fish Caught by Fishing Area
Table 8.3 Top Ten Adult Fish Caught by Homeport (Ma Wan/Tsing Lung Tau/Yam O)
Table 8.4 Average Price of Fresh Marine Fish sold at Wholesale Fish Market in Hong Kong (March 2000)
Table 9.1 Sensitive Visual Receivers
Table 9.2 Summary of Visual Impacts
Table 9.3 Summary of Landscape Loss and Compensation
Table 9.4 Summary of Landscape Impacts and Recommended Mitigation Measures
Table 9.5 Summary of Visual Impacts and Recommended Mitigation Measures
Table 12.1 Implementation Schedule for Dust Control
Table 12.2 Implementation Schedule for Noise Control
Table 12.3 Implementation Schedule for Water Quality Control
Table 12.4 Implementation Schedule for Waste Management Implications
Table 12.5 Implementation Schedule for Ecology
Table 12.6 Implementation Schedule for Landscape and Visual
List of Figures
Figure 2.1 Location of the Subject Site
Figure 3.1 Locations of Representative Air Sensitive Receivers
Figure 3.2 Contours of 1-Hour Average Nitrogen Dioxide Concentrations in µg/m3 at 1.5m above Ground
Figure 3.3 Contours of 1-Hour Average Nitrogen Dioxide Concentrations in µg/m3 at 10m above Ground
Figure 3.4 Contours of 24-hour Average Nitrogen Dioxide Concentrations in µg/m3 at 1.5m above Ground
Figure 3.5 Contours of 24-hour Average Nitrogen Dioxide Concentrations in µg/m3 at 10m above Ground
Figure 4.2 Locations of Representative Noise Sensitive Receivers during Operation Phase
Figure 4.3 Locations of Proposed Noise Mitigation Measures (Mitigation 1)
Figure 4.4 Locations of Noise Barriers for Alternative Roundabout No. 1B at Siu Lam Interchange
Figure 4.5 Locations of Proposed Noise Mitigation Measures (Mitigation 2)
Figure 5.1 Locations of Monitoring Station NM1, NM2 and WM4
Figure 6.1 Sediment Sampling Locations
Figure 7.1 Field Sampling Points of Freshwater Habitats
Figure 7.2a Terrestrial Habitat Map and Study Boundary
Figure 7.2b Terrestrial Habitat Map and Study Boundary
Figure 7.3 Locations of Potential Breeding Area
Figure 7.4 Marine Habitat Map and Field Sampling Locations
Figure
8.1 Fisheries Key Areas
Figure 9.1A Landscape and Visual Impact Study Area
Figure 9.1B Cross Sections of Proposed Road
Figure 9.2A Landscape Character Areas-Photographic Viewpoints Locations
Figure 9.2B Landscape Character Areas-Photographic Record
Figure 9.2C Landscape Character Areas-Photographic Record
Figure 9.3 Viewshed and Sensitive Visual Receivers
Figure 9.4 Planning and Development Control Framework in Study Area
Figure 9.6A Photomontages-From Ma Wan Channel
Figure 9.6B Photomontages-From Siu Lam Overbridge
Figure 9.6C Photomontages-From Brothers Point
Figure 9.6D Photomontages-From Siu Lam Police Quarters
Figure 9.6E Photomontages-From Poseidon Coast Residences
Figure
9.7 Landscape Mitigation Measures: Typical
Cross Section of Road and Seawall
Figure 9.8A Landscape Proposal (Sheet 1 of 5)
Figure 9.8B Landscape Proposal (Sheet 2 of 5)
Figure 9.8C Landscape Proposal (Sheet 3 of 5)
Figure
9.8D Landscape Proposal (Sheet 4 of 5)
Figure 9.8E Landscape Proposal (Sheet 5 of 5)
Appendices
Appendix 2.2 Project Constraints
Appendix 2.3 Key Issues and Constraints
Appendix 2.12 Typical Cross – Section of Proposed Road
Appendix 2.13 Alternative Roundabout Layout at Tai Lam Kok
Appendix 2.14 Precast/Cast – In – Situ Segmental Box Girder Bridge – Cross - Section
Appendix 2.15 Alternative Roundabout Layout No. 1A at Siu Lam Interchange
Appendix 2.16 Alternative Roundabout Layout No. 1B at Siu Lam Interchange
Appendix 2.17 Alternative Roundabout Layout No. 2 at Siu Lam Interchange
Appendix 2.18 Alternative Roundabout Layout No. 3 at Siu Lam Interchange
Appendix 2.19 Preliminary Construction Programme
Appendix 2.20 Projected 2003 Peak Hour Traffic Flows
Appendix 2.21 Projected 2022 Peak Hour Traffic Flows
Appendix 3.1 Calculations of Dust Emission Factors
Appendix 3.2 Sample Computer Output of FDM Calculations
Appendix 3.3 Calculations of Road Traffic Emission Factors
Appendix 3.4 Sample Computer Outputs of CALINE4 Calculations
Appendix 3.5 Calculations of Emission Factor and Mass of Pollutants in Year 2002
(Open Roads near Portal Exits)
Appendix 3.6 Sample Computer Output of ISCST3 Calculations
Appendix 3.7(a&b)Detailed
Calculation of In-tunnel
Air Quality
Appendix 4.1
Defined ‘New’ Roads and ‘Existing’ Roads
Appendix 4.3a Powered Mechanical Equipment for Construction Activities
Appendix 4.3d
Sound Power Level of Powered Mechanical
Equipment for Various Construction Activities (With the Use of Quiet Equipment
and Moveable Barrier)
Appendix 4.3e Sound Power Level of Powered Mechanical Equipment for Various Construction Activities (With the Use of Quiet Equipment, Moveable Barrier and Restriction on Usage of Operating PME)
Appendix 4.4 Sample Calculation for Construction Noise
Appendix 4.5 Sample Output File for Traffic Noise Model Calculation
Appendix 4.6a Construction Noise Assessment Result - Unmitigated
Appendix 4.6b Construction Noise Assessment Result –With the Adoption of Quiet Equipment
Appendix 4.7a Traffic Noise Assessment Results
Appendix 4.7b Predicted Traffic Noise Levels for Alternative Layout (Mitigated)
Appendix 4.7c Assessment of Noise Sensitive Receivers Eligible for Indirect Technical Remendies
Appendix 4.8 Traffic Forecast for 2011 (Without Route 10 NLYLH’s Siu Lam Link Road)
Appendix 7.1
Field Survey Schedule