South Wales Metro Task Order 028-I – Taffs Well Depot Outline Planning – Noise Assessment March 2018 367590-WTD-CAR-28I-08 Mott MacDonald Fitzalan House Fitzalan Road Cardiff CF24 0EL United Kingdom T +44 (0)29 2046 7800 F +44 (0)29 2047 1888 mottmac.com South Wales Metro 367590-WTD-CAR-28I-08 Task Order Mott MacDonald028-I – Taffs Well Depot Outline Planning – Noise Assessment March 2018 Mott MacDonald Limited. Registered in England and Wales no. 1243967. Registered office: Mott MacDonald House, 8-10 Sydenham Road, Croydon CR0 2EE, United Kingdom 367590-WTD-CAR-28I-08 Mott MacDonald | South Wales Metro Task Order 028-I – Taffs Well Depot Outline Planning – Noise Assessment Issue and Revision Record Revision Date Originator Checker Approver Description A 21.11.17 R Monckton TechIOA R Roper MIOA M Forni MIOA First Issue B 14.12.17 R Monckton TechIOA R Roper MIOA M Forni MIOA First Issue Resubmission C 09.03.18 R Monckton TechIOA R Roper MIOA M Forni MIOA Hybrid Planning Application Document reference: 367590-WTD-CAR-28I-08 Information class: Standard This document is issued for the party which commissioned it and for specific purposes connected with the above- captioned project only. It should not be relied upon by any other party or used for any other purpose. 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Under no circumstances may this report or any extr act or summar y ther eof be used in connection with any public or pri vate sec urities offering i ncluding any rel ated memorandum or prospectus for any securities offering or stock exchange listing or announcement. 367590-WTD-CAR-28I-08 | March 2018 Mott MacDonald | South Wales Metro Task Order 028-I – Taffs Well Depot Outline Planning – Noise Assessment Contents 1 Introduction 1 1.1 Overview 1 1.2 Project Description and Scope of Works 1 1.3 Existing Site 3 1.4 Proposed Site 3 1.5 Noise Assessment 3 2 Guidance and Standards 5 2.1 British Standards 5 2.1.1 British Standard 4142:2014 5 2.1.2 British Standard 5228 Part 1 (Noise) 5 2.2 National legislation 6 2.2.1 Environmental Protection Act 6 2.2.2 The Control of Pollution Act 7 2.3 Regional legislation 7 2.3.1 Planning Policy Wales 7 2.3.2 Technical Advice Note 11 7 2.4 Local legislation 8 2.5 Other relevant guidance 8 2.5.1 World Health Organization’s ‘Guidelines for Community Noise’ 8 2.6 Consultation with Rhondda Cynon Taf Council 9 3 Noise Survey 10 3.1 Noise Survey Methodology 10 3.2 Survey Equipment 10 3.3 Measurement Locations 11 3.4 Observations 12 3.4.1 Long-Term Measurements 12 3.4.2 Short-Term Measurements 12 3.5 Weather Conditions 13 3.5.1 Long-Term Measurements 13 3.5.2 Short-Term Measurements 13 3.6 Noise Measurement Results 13 3.6.1 Unattended Noise Measurement Results 13 3.6.2 Attended Noise Measurement Results 16 3.7 Uncertainty in Acoustic Measurements 17 4 Construction Noise Assessment 18 367590-WTD-CAR-28I-08 | March 2018 Mott MacDonald | South Wales Metro Task Order 028-I – Taffs Well Depot Outline Planning – Noise Assessment 4.1 Assessment Methodology 18 4.2 Taffs Well Depot Construction Plant Inventory – Day-Time Works 18 4.3 Taffs Well Depot Construction Plant Inventory – Night-Time Works 21 4.4 Construction Noise Assessment 21 4.5 Construction Vibration 24 5 Operational Noise Assessment 25 5.1 Acoustic Modelling Assessment 25 5.1.1 Acoustic Modelling Assumptions 25 5.1.2 Acoustic Model Validation 26 5.1.3 Acoustic Modelling Results 26 5.2 BS4142 Assessment 27 5.2.1 Determination of Background Sound Level 28 5.2.2 Noise Levels from Proposed Plant Items 28 6 Mitigation 30 6.1.1 Construction Noise 30 6.1.2 Construction Vibration 31 7 Conclusion 32 Appendices 33 A. Noise Measurement Positions – Photographs 34 B. Noise Contours 38 C. Glossary of Terms 48 D. Taffs Well Depot - Location Plan (367590-MMD-28I-XX-DR-C-0001) 50 E. Taffs Well Depot - Ground Level Master Plan (367590-MMD-28I-XX- DR-C-0002) 51 F. Taffs Well Depot - Upper Level Master Plan (367590-MMD-28I-XX- DR-C-0003) 52 367590-WTD-CAR-28I-08 | March 2018 Mott MacDonald | South Wales Metro 1 Task Order 028-I – Taffs Well Depot Outline Planning – Noise Assessment 1 Introduction 1.1 Overview Mott MacDonald Limited has been commissioned to undertake a baseline noise survey and provide an assessment of potential noise impacts during the construction and operation of a proposed new rolling stock depot at Taffs Well, approximately 6 miles north of Cardiff. This document has been prepared by Mott MacDonald as a standalone technical report detailing the assessment, prepared on behalf of Transport for Wales (TfW) for the hybrid planning application for the depot. The assessment is based on the results of a baseline noise monitoring survey undertaken between September and October 2017 and an acoustic modelling study. The construction and operation of the proposals have the potential to give rise to temporary and permanent noise and vibration impacts resulting in effects to nearby sensitive noise receptors. 1.2 Project Description and Scope of Works Mott MacDonald has been commissioned by Transport for Wales (TfW) to provide planning and technical support during the current procurement phase for the next ‘Wales and Borders Rail Service’ which will include the development of the South Wales Metro Phase 2, focusing specifically on the Core Valley Lines (CVL). This programme of works, funded by the Welsh and UK Governments and the European Commission, will transform the rail network involving extensive investment in new rolling stock, stations and associated infrastructure. It will deliver a step change in the public transport offer bringing about improved connectivity between the CVL and Cardiff and providing a much needed modern, reliable and efficient public transport system. As part of the investment required to transform the rail network, additional depot and stabling facilities are required to accommodate the new fleet of rolling stock. As such, Welsh Government undertook a comprehensive site search process to find suitable and available land. This has resulted in Welsh Government acquiring the former ‘Forgemasters’ building and associated land at Garth Works Industrial Estate in Taffs Well. The whole site area, including the associated works to Taffs Well Station, extends to some 5.4 hectares and is shown on drawing number 367590- 28I-XX-DR-C-0005.