M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report HE549344-MMSJV-EGN-000-RP-LX-00010 07/11/18 Collaborative Delivery Framework M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report Revision Record Rev Date Originator Checker Approver Status Suitability No P01 20/02/2018 S3 For Review P02 22/05/2018 S3 For Review P03 19/07/2018 S4 For issue P04 21/09/2018 S4 For issue P05 07/11/2018 S4 For issue This document has been prepared on behalf of Highways England by Mott MacDonald Sweco JV for Highways England's Project Support Framework (PSF). It 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. Mott MacDonald Sweco JV accepts no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from Highways England. Prepared for: Prepared by: Highways England Mott MacDonald Sweco JV Temple Quay House, Stoneham Place, Stoneham Lane 2 The Square, Bristol Southampton, Hampshire BS1 6HA SO50 9NW Page 1 Collaborative Delivery Framework M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report Contents Page 0. Executive summary ............................................................................................... 11 Introduction ........................................................................................................................ 11 Air quality ........................................................................................................................... 12 Ecology and nature conservation ...................................................................................... 12 Landscape and cultural heritage ....................................................................................... 13 Noise and vibration ............................................................................................................ 13 Road drainage and the water environment........................................................................ 14 Combined and cumulative effects ..................................................................................... 15 Conclusion ......................................................................................................................... 15 1. Introduction ............................................................................................................ 16 1.1 Overview of the proposed scheme ....................................................................... 16 1.2 Overview of the existing motorway ....................................................................... 18 1.3 Purpose of this Environmental Assessment Report ............................................. 20 1.4 Background to the Smart Motorways Programme ................................................ 20 1.5 The Road Investment Strategy and Highways England Licence .......................... 22 1.6 Guidance followed for this report .......................................................................... 26 2. The proposed scheme .......................................................................................... 27 2.1 Need for the proposed scheme ............................................................................ 27 2.2 Proposed scheme description .............................................................................. 27 2.3 Operating regime.................................................................................................. 28 2.4 Carriageways ....................................................................................................... 29 2.5 Pavement ............................................................................................................. 29 2.6 Central reserve works .......................................................................................... 29 2.7 Verge and all lane running works ......................................................................... 30 2.8 Emergency refuge areas ...................................................................................... 31 2.9 Signs and gantries ................................................................................................ 31 2.10 Works to structures .............................................................................................. 35 2.11 Lighting ................................................................................................................. 36 2.12 Turnarounds ......................................................................................................... 36 2.13 Police observation platforms ................................................................................ 36 2.14 Power supply ........................................................................................................ 37 Page 2 Collaborative Delivery Framework M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report 2.15 Maintenance access ............................................................................................. 37 2.16 Non-motorised user movement at junctions ......................................................... 37 2.17 Communication cabling and ducting..................................................................... 37 2.18 Environmental barriers ......................................................................................... 37 2.19 Site clearance ...................................................................................................... 38 2.20 Drainage strategy ................................................................................................. 38 2.21 Demolitions and removals .................................................................................... 39 2.22 Environmental design ........................................................................................... 40 2.23 Operational considerations ................................................................................... 41 2.24 Construction works ............................................................................................... 42 2.25 Temporary works .................................................................................................. 42 2.26 Construction traffic management.......................................................................... 44 2.27 Earth slopes and retaining structures ................................................................... 46 2.28 Other considerations ............................................................................................ 49 2.29 Land take ............................................................................................................. 50 2.30 Proposed operation and long-term management ................................................. 50 3. Alternatives considered ........................................................................................ 51 3.1 Programme level alternatives ............................................................................... 51 3.2 Proposed scheme specific alternatives ................................................................ 51 4. Environmental impact assessment methodology .............................................. 53 4.1 Regulatory framework .......................................................................................... 53 4.2 Screening ............................................................................................................. 53 4.3 Scoping ................................................................................................................ 54 4.4 Stakeholder consultation ...................................................................................... 56 5. Air Quality .............................................................................................................. 59 5.1 Introduction .......................................................................................................... 59 5.2 Assessment methodology .................................................................................... 60 5.3 Policy and legislation ............................................................................................ 68 5.4 Baseline conditions .............................................................................................. 72 5.5 Design mitigation and enhancement .................................................................... 78 5.6 Assessment of effects .......................................................................................... 80 5.7 Assessment of significance .................................................................................. 94 Page 3 Collaborative Delivery Framework M27 Junction 4 to 11 Smart Motorways Environmental Assessment Report 6. Biodiversity ............................................................................................................ 97 6.1 Introduction .......................................................................................................... 97 6.2 Study area ...........................................................................................................