Government of Hong Kong Highways Department LANTAU FIXED CROSSING I [ i ~ Environmental Assessment Final Report RECEI VEO Volume 1 Agreement No. CE/11j78 Mott MacDonald Hong Kong Ltd. in association with Harris & Sutherland (Far East) L G. Mouchel & Partners (Asia) [ li LANTAU FIXED CROSSING AGREEMENT NO. CE/11I78 [I ENVIRONMENTAL ASSESSMENT FINAL REPORT [j VOLUME 1 o TABLE OF CONTENTS Page 1. INTRODUCTION 1.1 o 1.1 Background 1.1 1.2 Synopsis 1.2 1.2.1 Objectives of the Environmental Planning Assessment 1.2 o 1.2.2 Methodology 1.2 1.2.3 Air Quality 1.3 1.2.4 Water Quality 1.4 o 1.2.5 Noise Pollution 1.8 1.2.6 Visual Impacts 1.11 1.2.7 Land Use Impacts 1.11 [I 1.2.8 Recommendations in the EPA 1.12 2. AIR QUALITY 2.1 C I 2.1 Introduction 2.1 l. 2.2 Background 2.1 2.3 Air Sensitive Receivers 2.2 2.4 Meteorological D~ta 2.3 U 2.5 Methodology for the Construction Phase Assessment 2.3 2.5.1 Modelling Techniques 2.4 2.5.2 Wind Conditions 2.4 [J 2.5.3 Emission Factors 2.5 2.5.4 Construction Activities for the LFC 2.5 2.5.5 Construction Activities for Route 3 2.6 [I 2.5.6 Works Areas 2.6 2.6 Assessment of Construction of the LFC excluding the 2.6 North Lantau Road o 2.6.1 Predicted Dust Levels 2.6 2.6.2 Mitigation Measures 2.10 2.7 Assessment of Construction of the LFC including the 2.11 U North Lantau Road 2.7.1 Introduction 2.11 2.7.2 1 Hour Dust Levels 2.11 [1 2.7.3 24 Hour Dust Levels 2.16 2.7.4 Mitigation Measures 2.16 2.8 Operational Phase Assessment 2.17 2.8.1 Methodology 2.17 o 2.8.2 Operation Stage Impact Assessment and Evaluation 2.18 2.8.3 Combined Operation Stage Impacts from Route 3 2.19 u 2.8.4 Mitigation Measures during Operation 2.19 Jj i 1 ~ . -' [ Page [ 3. WATER QUALITY 3.1 3.1 Background 3.1 [ 3.2 Extension of the Tung Wan Embayment 3.2 3.3 Penny's Bay Works Site 3.4 3.4 Kap Shui Mun Works Sites 3.6 [ 3.5 Underwater Blasting 3.8 3.6 Disposal of Dredged Materials 3.8 3.7 Monitoring during Construction 3.8 3.8 Environmental Audit 3.9 D 4. CONSTRUCTION NOISE 4.1 4.1 Introduction 4.1 [ 4.2 The EXCO Exemption 4.1 4.3 Methodology 4.2 4.4 Construction Activities 4.6 [ 4.5 Sensitive Receivers 4.6 4.6 Acceptable Noise Levels 4.7 4.7 Noise from Construction of the Tsing Ma Bridge 4.8 [ 4.7.1 General 4.8 4.7.2 Impacts during Period 1 4.11 4.7.3 Impacts during Period 2 4.11 [ 4.7.4 Noise Mitigation at Receivers 4.11 4.7.5 Conclusions and Recommendations 4.15 4.8 Noise from the Construction of the Kap Shui Mun Bridge/ 4.15 [ Ma Wan Viaducts 4.8.1 General 4.15 4.8.2 Impacts during Period 1 4.19 [ 4.8.3 Impacts during Period 2 4.26 4.8.4 Noise Mitigation at Receivers 4.26 4.8.5 Conclusions and Recommendations 4.26 [ 5. RAILWAY NOISE 5.1 5.1 Introduction 5.1 5.2 Tsing Ma Bridge 5.1 C 5.2.1 Introduction 5.1 5.2.2 Trackform Options Considered 5.1 5.2.3 Acoustic Considerations 5.3 [ 5.2.4 Engineering Aspects 5.5 5.3 Kap Shui Mun Bridge and Ma Wan Viaducts 5.7 r· 5.3.1 Environmental Reference Scheme 5.7 L 5.3.2 Technical Decisions 5.8 5.3.3 Predicted Noise Levels 5.10 5.3.4 Conclusions 5.12 [ 6. LAND USE 6.1 6.1 Afteruse of Project Works Sites 6.1 [ 6.2 Potential Afteruses 6.1 [ 0 [. [ U LIST OF TABLES Page 0 2.1 Background Levels of Air Pollution at East Tsing Yi 2.2 2.2 Air Quality Data Collected at Tung Chung 2.2 2.3 Air Quality Objectives 2.4 0 2.4 Maximum Predicted TSP Levels (Without Mitigation) 2.7 2.5 Maximum Predicted RSP Levels (Without Mitigation) 2.8 Q 2.6 Summary of the Percentage Exceedance of 24-Hour AQO during 2.10 Construction (Without Mitigation) 2.7 Highest I-Hr .TSP (p.g/m') Concentration for the North Lantau Road 2.12 - Background Level Excluded (Without Mitigation) n 2.8 Combined I-Hr TSP (p.g/m') Concentration - Background Level 2.12 Included (Without Mitigation) 2.9 Combined I-Hr TSP (p.g/m') Concentration - Background Level 2.12 [I Included (With Mitigation) 2.10 Highest I-Hr RSP (p.g/m') Concentration for the North Lantau Road 2.13 - Background Level Excluded (Without Mitigation) 0 2.11 Combined I-Hr RSP (p./m') Concentration - Background Level 2.13 Included (Without Mitigation) 2.12 Combined I-Hr RSP (p.g/m') Concentration - Background Level 2.13 [l Included (With Mitigation) 2.13 24-Hr Averaged TSP (p.g/m') Concentration for the North Lantau 2.14 Road - Background Level Excluded (Without Mitigation) [I 2.14 Combined 24-Hr Averaged TSP (p.g/m') Concentration - Background 2.14 Level Excluded (Without Mitigation) 2.15 Combined 24-Hour Averaged TSP (p.g/m') Concentration - Background 2.14 11 Level Excluded (With Mitigation) t J 2.16 24-Hr Averaged RSP (p.g/m') Concentration for the North Lantau 2.15 Road - Background Level Excluded (Without Mitigation) [] 2.17 Combined 24-Hr Averaged RSP (p.g/m') Concentration - Background 2.15 Level Excluded (Without Mitigation) 2.18 Combined 24-Hr Averaged RSP (p.g/m') Concentration - Background 2.15 Level Excluded (With Mitigation) 0 2.19 Average Traffic Mix 2.17 2.20 Traffic Flow during Operation Phase 2.17 0 2.21 Modelling Results - Operation Stage (including background) 2.18 3.1 Net Velocity Vectors of Stations 1, 4 and 6 on Neap and Spring Tide 3.3 Cycles at Tung Wan Bay [j 3.2 Net Velocity Vectors of Stations 1, 3 and 7 on Neap and Spring Tide 3.7 Cycles at Kap Shui Mun [ Page [ 4.1 Noise Mitigation 4.5 4.2 Sensitive Receivers 4.7 [i 4.3 Area Sensitivity Ratings (ASRs) 4.8 4.4 Basic Noise Levels (BNLs) 4.8 4.5 Sound Power Levels from Tsing Ma Bridge/Ma Wan Substructure 4.9 4.6 Sound Power Levels from Tsing Ma Bridge/Tower Construction 4.9 C 4.7 Sound Power Levels from Tsing Ma Bridge/Tsing Yi Substructure 4.10 4.8 Sound Power Levels from Tsing Ma Bridge/Suspension Cables 4.10 4.9 Sound Power Levels from Tsing Ma Bridge/Deck Superstructure 4.10 C 4.10 Tsing Ma Bridge Construction Noise - Without Mitigation 4.12 4.11 Exceedance of ANL for Period 1 - with Mitigation Methods A, B and C 4.13 4.12 Exceedance of ANL for Period 2 - with Mitigation Methods A, B and C 4.14 C 4.13 Maximum Noise Levels for the Tsing Ma Bridge Contract 4.15 4.14 Sound Power Levels from Kap Shui Mun Bridge/Lantau Works Site 4.15 4.15 Sound Power Levels from Kap Shui Mun Bridge/Ma Wan Works Site 4.16 C 4.16 Sound Power Levels from Kap Shui Mun BridgelLantau Anchorage 4.16 4.17 Sound Power Levels from Kap Shui Mun Bridge/Ma Wan Anchorage 4.16 4.18 Sound Power Levels from Kap Shui Mun Bridge/Lantau Tower 4.17 C 4.19 Sound Power Levels from Kap Shui Mun Bridge/Ma Wan Tower 4.17 4.20 Sound Power Levels from Kap Shui Mun Bridge/Lantau Pier 4.17 4.21 Sound Power Levels from Kap Shui Mun Bridge/Ma Wan Pier 4.18 [ 4.22 Sound Power Levels from Kap Shui Mun Bridge/Deck Superstructure 4.18 4.23 Sound Power Levels from Ma Wan Viaducts/Piers A to H 4.18 4.24 Sound Power Levels from Ma Wan ViaductslWorks Area and Haul Road 4.19 4.25 Kap Shui Mun Bridge Construction Noise - Without Mitigation 4.20 C 4.26 Exceedance of ANL for Period 1 for the Kap Shui Mun Bridge - with 4.21 Mitigation Methods A, B and C 4.27 Exceedance of ANL for Period 2 for the Kap Shui Mun Bridge - with 4.22 C Mitigation Methods A, B and C 4.28 Ma Wan Viaducts Construction Noise - without Mitigation 4.23 4.29 Exceedance of ANL for Period 1 for the Ma Wan Viaducts - with 4.24 C Mitigation Methods A, B and C 4.30 Exceedance of ANL for Period 2 for the Ma Wan Viaducts - with 4.25 Mitigation Methods A, B and C [ 4.31 Maximum Noise Levels for the Kap Shui Mun/Ma Wan Viaducts Contracts 4.26 5.1 Predicted Facade Noise Levels 5.11 [ 11 LJ 0 u11 L [ lJI r~ L! li lj LIST OF FIGURES 2.1 Study Area and Locations of Sensitive Receivers [l 2.2 Key Construction Activities during Period 1 Excluding NLR 2.3 Key Construction Activities during Period 2 Excluding NLR 2.4 Key Construction Activities during Period 3 Excluding NLR 2.5 Key Construction Activities during North Lantau Road Construction 0 2.6 Highest I-Hour TSP Level Distribution during Period 1 Excluding NLR 2.7 Highest I-Hour RSP Level Distribution during Period 1 Excluding NLR [1 2.8 Highest I-Hour TSP Level Distribution during Period 2 Excluding NLR J 2.9 Highest I-Hour RSP Level Distribution during Period 2 Excluding NLR 2.10 Highest I-Hour TSP Level Distribution during Period 3 Excluding NLR 2.11 Highest I-Hour RSP Level Distribution during Period 3 Excluding NLR n 2.12 Predicted 24-Hour TSP Concentration in Period 1 Excluding NLR 2.13 Predicted 24-Hour RSP Concentration in Period 1 Excluding NLR 2.14 Predicted 24-Hour TSP Concentration in Period 2 Excluding NLR n 2.15 Predicted 24-Hour RSP Concentration in Period 2 Excluding NLR 2.16 Predicted 24-Hour TSP Concentration in Period 3 Excluding NLR 2.17 Predicted 24-Hour RSP Concentration in Period 3 Excluding NLR n 2.18 Highest I-Hour TSP Level Distribution during Period 3 Including NLR 2.19 Highest I-Hour RSP Level Distribution during Period 3 Including NLR 2.20 Highest I-Hour TSP Level Distribution during Period 3 Including NLR With Mitigation [1J 2.21 Highest I-Hour RSP Level Distribution during Period 3 Including NLR With Mitigation 2.22 24-Hour Average TSP Distribution during Period 3 Including NLR [-I 2.23 24-Hour Average RSP Distribution during Period 3 Including NLR .1 2.24 24-Hour Average TSP Distribution during Period 3 Including NLR With Mitigation 2.25 24-Hour Average RSP Distribution during Period 3 Including NLR With Mitigation 2.26 Predicted 24-Hour TSP Concentration in Period 3 Including NLR [-I 2.27 Predicted 24-Hour RSP Concentration in Period 3 Including NLR ~) .2.28 Predicted 24-Hour TSP Concentration in Period 3 Including NLR With Mitigation 2.29 Predicted 24-Hour RSP Concentration in Period 3 Including NLR With Mitigation