M4 East EIS Volume 2C App I Part 01 Noise and Vibration

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
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