M4 East EIS Volume 2C App I Part 01 Noise and Vibration (pdf)
| Contents | Pages |
|---|---|
| Executive Summary | |
| Introduction | xiii |
| Existing environment | xiii |
| Relevant guidelines | xiv |
| Operational road traffic noise assessment | xiv |
| Ventilation facilities noise impact assessment | xv |
| Assessment of construction noise – on site works | xv |
| Assessment of construction noise – public road network | xvi |
| Construction ground-borne noise assessment | xvi |
| Construction vibration assessment | xvii |
| 1 Introduction | 1 |
| 1.1 Overview of the project | 1 |
| 1.2 Project location | 1 |
| 1.3 Secretary’s environmental assessment requirements | 4 |
| 1.4 Purpose of this report | 7 |
| 1.5 Structure of this report | 7 |
| 1.6 Relevant guidelines | 7 |
| 1.7 Terminology | 7 |
| 2 Proposed project | 8 |
| 2.1 Project features | 8 |
| 2.2 Construction activities | 11 |
| 2.2.1 Overview | 11 |
| 2.2.2 Construction footprint | 11 |
| 2.2.3 Construction program | 12 |
| 2.3 Noise and vibration specific aspects | 14 |
| 3 Description of the existing environment | 15 |
| 3.1 Existing environmental noise | 15 |
| 3.2 Identification of noise and vibration sensitive receivers | 19 |
| 3.3 Ambient noise surveys and monitoring locations | 21 |
| 3.4 Unattended noise monitoring | 22 |
| 3.4.1 Methodology | 22 |
| 3.4.2 Noise monitoring results | 22 |
| 3.5 Attended airborne noise | 23 |
| 3.5.1 Methodology | 23 |
| 3.5.2 Noise measurement results | 23 |
| 4 Operational noise goals and noise mitigation guidance | 26 |
| 4.1 Introduction | 26 |
| 4.2 Operational noise metrics | 26 |
| 4.3 Noise Criteria Guideline | 26 |
| 4.4 Noise assessment criteria | 27 |
| 4.4.1 Criteria by Road Type | 27 |
| 4.5 Potential road traffic noise impacts on the surrounding road network | 29 |
| 4.6 Sleep disturbance | 30 |
| 5 Key assumptions for prediction of airborne noise during operation | 31 |
| 5.1 Assessment scenarios | 31 |
| 5.2 Road noise prediction algorithms | 31 |
| 5.3 Modelling of the road alignment | 32 |
| 5.4 Noise model validation | 32 |
| 5.4.1 Overview | 32 |
| 5.4.2 Existing surface | 33 |
| 5.4.3 Validation traffic data | 33 |
| 5.4.4 Step 1: Check free flowing traffic noise levels | 33 |
| 5.4.5 Step 2: Potential congestion correction effects | 33 |
| 5.4.6 Step 3: Detailed review of traffic speeds in traffic counts | 33 |
| 5.4.7 Noise Model Validation Corrections | 33 |
| 5.4.8 Model validation summary | 36 |
| 5.5 Modelling of pavement surfaces | 37 |
| 5.6 Modelling of traffic data | 37 |
| 5.7 Modelling of congestion | 38 |
| 5.8 Modelling of smart motorway ramps | 38 |
| 5.9 Modelling of Tunnel and Tunnel Portals | 38 |
| 5.10 Modelling of noise barriers – Build scenario without mitigation | 38 |
| 5.11 Roads modelled in the assessment | 39 |
| 5.12 Assessed receiver facades | 40 |
| 5.13 Receiver counts | 40 |
| 5.14 Highly urban area assessment boundary | 41 |
| 5.15 Summary of noise modelling parameters | 42 |
| 6 Process for feasible and reasonable operational noise mitigation | 43 |
| 6.1 Noise Mitigation Guideline | 43 |
| 6.2 Guidance for consideration of reasonable additional noise mitigation | 43 |
| 6.3 Procedure overview | 44 |
| 6.4 Definition of feasible and reasonable | 44 |
| 6.5 Road design and traffic management | 45 |
| 7 Operational road traffic noise impact assessment overview | 46 |
| 7.1 Operational noise impact without mitigation | 46 |
| 7.2 Additional noise mitigation – low noise pavement | 46 |
| 7.3 Additional noise mitigation – noise barriers | 46 |
| 7.3.1 Assessment overview | 46 |
| 7.3.2 NMG requirements | 47 |
| 7.4 Receivers considered for property treatments | 47 |
| 7.5 Architectural property treatments | 48 |
| 7.6 Sensitivity analysis | 48 |
| 7.7 Maximum noise levels | 49 |
| 8 Operational road traffic noise impact assessment | 50 |
| 8.1 Operational noise impacts without mitigation | 50 |
| 8.1.1 Change in noise levels without mitigation | 50 |
| 8.1.2 Receivers considered for additional noise mitigation | 52 |
| 8.2 Additional noise mitigation – low noise pavement | 55 |
| 8.3 Additional noise mitigation – noise barriers | 55 |
| 8.4 Operational noise impacts with mitigation | 61 |
| 8.4.1 Change in noise levels with mitigation | 61 |
| 8.4.2 Receivers considered for at-property treatment | 62 |
| 8.5 Discussion of at-property treatments | 63 |
| 8.6 Sensitivity analysis | 63 |
| 8.7 Maximum noise levels | 64 |
| 9 Ventilation facilities noise impact assessment | 67 |
| 9.1 Operational noise metrics | 68 |
| 9.2 Ventilation facility noise criteria | 68 |
| 9.2.1 INP criteria for intrusive noise | 68 |
| 9.2.2 INP criteria for amenity | 68 |
| 9.2.3 INP Modifying factor adjustments | 69 |
| 9.2.4 Sleep disturbance | 69 |
| 9.3 Sensitive receivers | 69 |
| 9.4 Noise goal summary | 73 |
| 9.5 Equipment data | 73 |
| 9.5.1 Tunnel jet fans | 73 |
| 9.5.2 Ventilation equipment | 74 |
| 9.6 Modelling scenario | 74 |
| 9.6.1 Tunnel jet fans | 74 |
| 9.6.2 Ventilation equipment | 74 |
| 9.7 Predicted noise impacts | 74 |
| 9.8 Predicted modifying factors | 75 |
| 9.9 Other facilities | 75 |
| 10 Assessment of construction noise – on site works | 76 |
| 10.1 Overview | 76 |
| 10.2 Proposed construction activities | 76 |
| 10.2.1 Proposed works | 76 |
| 10.2.2 Construction hours | 76 |
| 10.3 Construction noise metrics | 77 |
| 10.4 Noise management levels for construction activity | 77 |
| 10.4.1 Residential receivers | 77 |
| 10.4.2 Other sensitive land uses | 79 |
| 10.4.3 Commercial and industrial premises | 80 |
| 10.4.4 Construction traffic noise | 80 |
| 10.5 Overview of construction noise modelling | 81 |
| 10.5.1 Construction equipment | 81 |
| 10.5.2 Activity durations | 85 |
| 10.6 Noise assessment at the nearest noise sensitive receivers | 85 |
| 10.6.1 Predicted construction noise levels | 85 |
| 10.6.2 Work area establishment (continues in part 2) | 86 |
