EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS - Yuen Long and Kam Tin Sewerage and Sewage Disposal (YLKTSSD) Environmental Impact Assessment (Final)
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Drainage Services Department Agreement No. CE 66/2001(EP) EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS - Yuen Long and Kam Tin Sewerage and Sewage Disposal (YLKTSSD) Environmental Impact Assessment (Final) Drainage Services Department Agreement No. CE 66/2001(EP) EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS - Yuen Long and Kam Tin Sewerage and Sewage Disposal (YLKTSSD) Environmental Impact Assessment (Final) Mar 2004 Ove Arup & Partners Hong Kong Ltd Level 5, Festival Walk, 80 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong Tel +852 2528 3031 Fax +852 2268 3950 www.arup.com Job number 23527 EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS – Yuen Drainage Services Department Long and Kam Tin Sewerage and Sewage Disposal, EIA (Final) Document Verification Page 1 of 1 Job title CE 66/2001(EP), EIA and TIA Studies for the Stage 2 of Job number PWP Item No. 215DS - Yuen Long and Kam Tin 23527 Sewerage and Sewage Disposal (YLKTSSD) - Investigation Document title Environmental Impact Assessment (Final) File reference /C Document ref Revision Date Filename First 15/12/03 Description Environmental Impact Assessment (Final) Issue Prepared by Checked by Approved by Name Various Franki Chiu Sam Tsoi Signature Second 10/3/04 Filename G:\env\project\23527\reports\revised final EIA Stage 2\revised Stage2-EIA-3.doc Issue Description Environmental Impact Assessment (Final) with addendum pages Prepared by Checked by Approved by Name Various Franki Chiu Sam Tsoi Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document ©Arup Group Ltd F8.5 QA Rev 1/01 1 November 2001 EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS – Yuen Drainage Services Department Long and Kam Tin Sewerage and Sewage Disposal, EIA (Final) CONTENTS Page 1.0 INTRODUCTION 1 1.1 The Consultancy 1 1.2 The Project Background 1 1.3 The Site Location and Works 1 1.4 Previous Studies 2 1.5 Environmental Needs and Benefits 3 1.6 Structure of the Environmental Impact Assessment (EIA) Report 3 2.0 PROJECT DESCRIPTION 4 2.1 Construction Phasing and Details in North West New Territories 4 2.2 Neighbouring Environment 5 2.3 Planning Issue 6 2.4 Preliminary Construction Programme 7 2.5 Concurrent Projects 7 2.6 Future Planned Use 9 3.0 STUDY OBJECTIVES 11 3.1 Study Scope 11 4.0 AVAILABLE TECHNICAL INFORMATION 13 5.0 CONSIDERATIONS ON ALIGNMENT OPTIONS AND ALTERNATIVE PUMPING STATION LOCATIONS 14 5.1 Consideration on Alternative Alignment (on Designated Element) 14 5.2 Evaluation of Alignment Options 14 5.3 Evaluation Results 16 5.4 Consideration on Alternative Pumping Station Locations 18 6.0 CONSTRUCTION PHASE AIR QUALITY ASSESSMENT 20 6.1 Legislation and Standards 20 6.2 Baseline Environmental Conditions 20 6.3 Air Sensitive Receivers (ASRs) 20 6.4 Potential Sources for Dust Impact 20 6.5 Cumulative Dust Impact 20 6.6 Construction Dust Impact Review 20 6.7 Mitigation Measures during Construction Phase 21 7.0 OPERATIONAL PHASE AIR QUALITY ASSESSMENT 22 7.1 Odour Impact Regulation 22 7.2 Baseline Environmental Conditions 22 7.3 Air Sensitive Receivers (ASRs) 22 7.4 Septicity 22 7.5 Potential Sources of Odour Impact 22 7.6 Establishment of Odour Emission Rate 23 7.7 Establishment of Ventilation Effect 24 7.8 Estimation of Odour Emission Strength 24 7.9 Odour Assessment Results 27 7.10 Precautionary Measures during Emergency Discharge 27 7.11 Mitigation Measures during Operational phase 28 EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS – Yuen Drainage Services Department Long and Kam Tin Sewerage and Sewage Disposal, EIA (Final) 8.0 CONSTRUCTION NOISE ASSESSMENT 29 8.1 Legislation and Standards 29 8.2 Baseline Condition 30 8.3 Interfacing Projects 30 8.4 Noise Sensitive Receivers (NSRs) 32 8.5 Construction Noise Sources 32 8.6 Construction Noise Prediction Methodology 33 8.7 Assessment Results 34 8.8 Mitigation Measures for Construction Phase 39 8.9 Residual Construction Noise Impact 47 8.10 Environmental Monitoring and Auditing 51 9.0 OPERATIONAL PHASE NOISE ASSESSMENT 52 9.1 Legislation and Guidelines 52 9.2 Baseline Condition 52 9.3 Noise Sensitive Receivers (NSRs) 53 9.4 Potential Noise Sources 53 9.5 Operational Noise Prediction Methodology 53 9.6 Assessment Results for Operational Phase 53 9.7 Mitigation Measures for Operational Phase 54 10.0 WATER QUALITY ASSESSMENT 56 10.1 Legislation and Standards 56 10.2 Baseline Condition 56 10.3 Water Sensitive Receivers 57 10.4 Assessment Methodology for Construction Phase 59 10.5 Assessment Methodology for Operational Phase 59 10.6 Assessment Results and Recommendation 59 11.0 WASTE MANAGEMENT 69 11.1 Legislation and Standards 69 11.2 Assessment Methodology For Construction Phase 71 11.3 Assessment Findings and Recommendations 73 11.4 Potential Impact During Operational Phase 77 11.5 Summary 78 11.6 Mitigation Measures 79 11.7 Residual Environmental Impacts 81 11.8 Environmental Monitoring and Audit 81 12.0 LAND CONTAMINATION IMPLICATIONS 83 12.1 Legislation and Standards 83 12.2 Baseline Environmental Conditions 83 12.3 Methodology of Land Contamination Impact Assessment 83 12.4 Assessment Approach 85 12.5 Site-specific Approach 87 12.6 Findings and Recommendations 90 12.7 Mitigation Measures 95 13.0 ECOLOGICAL ASSESSMENT 96 13.1 Legislation and Standards 96 13.2 Assessment Methodology 96 13.3 Ecology Baseline Condition 97 13.4 Evaluation of Species and Habitat of Conservation Importance 106 13.5 Impact Identification and Evaluation for Construction Phase 109 EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS – Yuen Drainage Services Department Long and Kam Tin Sewerage and Sewage Disposal, EIA (Final) 13.6 Impact Avoidance and Mitigation Measures for Construction Phase 116 13.7 Impact Identification and Evaluation for Operational Phase 117 13.8 Impact Avoidance and Mitigation Measures for Operational Phase 118 13.9 Residual Impacts 118 13.10 Conclusion 118 14.0 LANDSCAPE AND VISUAL ASSESSMENT 119 14.1 Introduction 119 14.2 Environmental Legislation and Guidelines 119 14.3 Scope and Content of the Study 120 14.4 Planning and Development Control Framework 123 14.5 Baseline Study 123 14.6 Zone of Visual Influence (ZVI) 129 14.7 Landscape Impact Assessment 133 14.8 Visual Impact Assessment 152 14.9 Summary 164 15.0 CULTUAL HERITAGE ASSESSMENT 167 15.1 Legislation and Standards 167 15.2 Existing/Baseline Condition 167 15.3 Assessment Methodology for Construction Phase 177 15.4 Results of the desk-based Study 178 15.5 Results of Built Heritage Survey (Construction Phase) 181 15.6 Results of the Archaeological Field Evaluation (Construction Phase) 185 15.7 Assessment Results for Built Heritage (Construction Phase) 188 15.8 Assessment Results on Archaeology (Construction Phase) 194 15.9 Mitigation Measures on Built Heritage for Construction Phase 195 15.10 Mitigation Measures on Archaeology for Construction Phase 199 15.11 Assessment Methodology for Operational Phase 199 15.12 Assessment Results for Operational Phase 199 15.13 Mitigation Measures for Operational Phase 201 16.0 FISHERY IMPACT 204 16.1 Legislation and Standards 204 16.2 Assessment Methodology 204 16.3 Fisheries Baseline Condition 204 16.4 Impact Identification and Evaluation for Construction Phase 206 16.5 Impact Avoidance and Mitigation Measures for Construction Phase 208 16.6 Impact Identification and Evaluation for Operational Phase 209 16.7 Impact Avoidance and Mitigation Measures for Operational Phase 209 17.0 ENVIRONMENTAL MONITORING AND AUDIT (EM&A) 212 17.1 Air Quality Impact 212 17.2 Noise Impact 212 17.3 Water Quality Assessment 213 17.4 Waste Management 213 17.5 Land Contamination Implications 214 17.6 Ecological Assessment 214 17.7 Landscape and Visual Impacts 214 17.8 Cultural Heritage Assessment 215 17.9 Fisheries Assessment 217 18.0 SUMMARY OF ENVIRONMENTAL OUTCOMES 218 18.1 Air Quality Impact 218 EIA and TIA Studies for the Stage 2 of PWP Item No. 215DS – Yuen Drainage Services Department Long and Kam Tin Sewerage and Sewage Disposal, EIA (Final) 18.2 Noise Impact 218 18.3 Water Quality Impact 218 18.4 Waste Management Implications 219 18.5 Land Contamination Impact 219 18.6 Ecological Impact 220 18.7 Landscape and Visual Impact 221 18.8 Cultural Heritage Impact 222 18.9 Fisheries Impact 224 18.10 Summary of Options Review 224 19.0 CONCLUSION 226 19.1 Air Quality 226 19.2 Noise 226 19.3 Water Quality Assessment 227 19.4 Waste Management 228 19.5 Land Contamination Assessment 228 19.6 Ecological Assessment 228 19.7 Landscape & Visual Impact Assessment 229 19.8 Archaeology Assessment 229 19.9 Built Heritage Assessment 230 19.10 Fisheries Assessment 230 20.0 REFERENCES 232 FIGURES Figure 1.0 General overview of the sewerage system in the North NT Figure 1.0a Works packages and work items under the Study Figure 1.1, 1.1.1 to 1.1.9 Alignment - Lau Fau Shan (Alternative 2A-3T) & Tin Shui Wai Area (2A-1T) Figure 1.2, 1.2.1 to 1.2.5 Alignment - Shap Pat Heung (2B-2T) Figure 1.3, 1.3.1 to 1.3.8 Alignment – Ngau Tam Mei and San Tin Area (2A-2T and 2B-2T) Figure 1.4, 1.4.1 to 1.4.6 Alignment – Yuen Long/San Wai (Conforming Scheme) Figure 1.5 Study Area and Interfacing Boundary of 2A-1T and 2A-3T Figure 1.6 Study Area and Interfacing Boundary of 2B-2T Figure 1.7 Study Area and Interfacing Boundary of 2A-2T and 2B-3T Figure 1.8 Study Area and Interfacing Boundary of 2A-1T (Conforming) Figure 2.1 Locations of Potential Sensitive Receivers Within the Hung Shui Kiu Development Plan