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Agreement No. CE 69/2001 (HY) Scott Wilson Ltd Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing October 2008 Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment Table of Contents 3. NOISE IMPACTS........................................................................................................ 3-1 3.1 Introduction.................................................................................................................... 3-1 3.2 Operational Noise.......................................................................................................... 3-1 3.2.1 Environmental Legislations, Policies, Plans and Standards .................................. 3-1 3.2.2 Noise Sensitive Receivers...................................................................................... 3-1 3.2.3 Assessment Methodology.................................................................................... 3-11 3.2.4 Prediction and Evaluation of Noise Impacts........................................................ 3-16 3.2.5 Proposed Noise Mitigation Measures .................................................................. 3-21 3.2.6 Assessment of Noise Impacts with the Application of Mitigation Measures...... 3-23 3.2.7 Residual Impact................................................................................................... 3-33 3.2.8 Environmental Monitoring and Audit.................................................................. 3-33 3.2.9 Conclusions.......................................................................................................... 3-34 3.3 Construction Noise...................................................................................................... 3-34 3.3.1 Environmental Legislations, Policies, Plans and Standards ................................ 3-34 3.3.2 Assessment Methodology.................................................................................... 3-35 3.3.3 Prediction and Evaluation of Noise Impacts........................................................ 3-35 3.3.4 Proposed Noise Mitigation Measures .................................................................. 3-40 3.3.5 Assessment of Noise Impacts with the Application of Mitigation Measures...... 3-43 3.3.6 Residual Impact................................................................................................... 3-47 3.3.7 Environmental Monitoring and Audit.................................................................. 3-49 3.3.8 Conclusions.......................................................................................................... 3-50 List of Tables Table 3-1 Road Traffic Noise Assessment Criteria Specified in the EIAO-TM Table 3-2 Summary of the Identified Planned NSRs in the Project Table 3-3 Summary of Identified NSRs in the Project Table 3-4 Summary of Schools within Noise Assessment Area with Noise Mitigation Measures Table 3-5 Summary of Each Representative NSR Table 3-6 Summary of Traffic Data of Major Road Sections in the Project Table 3-7 Predicted Road Traffic Noise Levels at Each Identified NSR under the Unmitigated Scenario Table 3-8 Summary of Proposed Noise Mitigation Measures at Operational Phase for the Compliance of EIAO Noise Criteria Table 3-9 Predicted Road Traffic Noise Level at Each Identified NSR under the Mitigated Scenario Table 3-10 Total Number of Dwellings, Classrooms and Other Noise Sensitive Elements that will be Benefited From and be Protected by Provision of the Direct Noise Mitigation Measures Table 3-11 Predicted Construction Noise Levels at Representative NSRs during Normal Daytime Working Hours under the Unmitigated Scenario Table 3-12 Maximum SWLs for Selected “Quiet” and Alternative Plants Final EIA Report i 03.Noise Impact (20080922) Agreement No. CE 69/2001 (HY) Scott Wilson Ltd Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing October 2008 Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment Table 3-13 Predicted Construction Noise Levels at Representative NSRs during Normal Daytime Working Hours under the Mitigated Scenario Table 3-14 Residual Construction Noise Impact after Application of Noise Mitigation Measures List of Figures Figure 3-1 DP Road Extents of the Project Figure 3-2 Assessment Areas for Noise Impact Assessment Figure 3-3 Locations of Representative Noise Sensitive Receivers Figure 3-4 Locations of Selected Noise Assessment Points at each NSR Figure 3-5 Locations and Cross Sections of Proposed Direct Noise Mitigation Measures for Road Traffic Noise at Operation Phase List of Appendices Appendix 3-A Photos of Representative Noise Sensitive Receivers Appendix 3-B Building Layout Plans of Planned NSRs – Residential Developments at TW5, TW6, TW7 and TWTL 394 Appendix 3-C Photos of NSRs which are Government Aided Schools Appendix 3-D Source of Information Showing Government Aided Schools Under the “Noise Abatement Programme” Appendix 3-E Photos of NSRs with Window-type Air-conditioners Installed Appendix 3-F Source of Information Showing the Land Uses as Service Apartments with the Application of Central Air Conditioning for Chelsea Court (TWTL 373), Indi Home (TWTL 406) and H-Cube (TWTL 407) Appendix 3-G Correspondences for the Endorsement of the Final TIA Review Report Issued in January 2007 Appendix 3-H Traffic Forecast at Year 2010 and Year 2030 in the Final TIA Review Report Issued in January 2007 Appendix 3-I Locations and Photos of Existing Noise Mitigation Measures on Route 9 in Front of Summit Terrace and on Tsuen King Circuit Appendix 3-J Locations of Planned Noise Mitigation Measures on Tuen Mun Road and on Yeung Uk Road Appendix 3-K Correspondence for Information of Planned Noise Mitigation Measures and Low Noise Surfacing Pavement Appendix 3-L Typical Computer Plot of the “RoadNoise® 2000” Model Appendix 3-M Detailed Calculations for Construction Noise Impact Assessment and Complete PME Inventory Appendix 3-N Detailed Predicted Road Traffic Noise Results at Each Noise Assessment Point under the Unmitigated Scenario Appendix 3-O Detailed Predicted Road Traffic Noise Results at Each Noise Assessment Point under the Mitigated Scenario Final EIA Report ii 03.Noise Impact (20080922) Agreement No. CE 69/2001 (HY) Scott Wilson Ltd Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing October 2008 Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment Appendix 3-P Correspondence Showing the Anticipated Development Completion Dates of Residential Development at TW5 and TW7 Final EIA Report iii 03.Noise Impact (20080922) Agreement No. CE 69/2001 (HY) Scott Wilson Ltd Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing October 2008 Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment 3. NOISE IMPACTS 3.1 Introduction 3.1.1.1. Potential noise impact arising from the Project would be contributed by both construction and operational phase. This Chapter summarizes the identified potential sources of noise impact during the both phases, details of noise impact assessment and, where necessary, the recommended noise mitigation measures to reduce the identified noise impacts. 3.2 Operational Noise 3.2.1 Environmental Legislations, Policies, Plans and Standards 3.2.1.1. Road traffic noise criteria are listed in Table 1A, Annex 5 of the EIAO-TM, which provides guidance on acceptable road traffic noise levels at various types of noise sensitive buildings. The relevant criteria are shown in Table 3-1. These standards apply to uses which rely on opened windows for ventilation. Table 3-1 Road Traffic Noise Assessment Criteria Specified in the EIAO-TM Road Traffic Noise Assessment Criteria Uses – Peak Hour Traffic (L10,1 hour, dB(A)) All domestic premises including 70 temporary housing accommodation Hotels and hostels 70 Offices 70 Educational institutions including kindergartens, nurseries and all others 65 where unaided voice communication is required Places of public worship and courts of 65 law Hospitals, clinics, convalescences and homes for the aged, diagnostic rooms, 55 wards Note: The above standards apply to uses which rely on opened windows for ventilation. 3.2.1.2. Since the Project is a road improvement work in nature which does not include fixed noise sources such as ventilation systems of tunnels, noise impact generated by fixed noise sources is not anticipated. Noise impact during the operational phase is mainly contributed by road traffic noise. 3.2.2 Noise Sensitive Receivers Assessment Area 3.2.2.1. For operational noise impact assessment, a spatial scope of 300m from the proposed Project Boundary has been included as the Assessment Area. Road sections within the Final EIA Report 3-1 03.Noise Impact (20080922) Agreement No. CE 69/2001 (HY) Scott Wilson Ltd Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing October 2008 Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment Assessment Area are classified into “roads under the Designated Project (DP roads)” or “roads not under the Designated Project (non-DP roads)” as follows: • DP road – A road which is an expressway, trunk road, primary distributor road or district distributor road including new roads and major extensions or improvements to existing roads, as defined under item A.1, Part I, Schedule 2 of the EIAO