Llywodraeth Cymru / Welsh Government A487 New Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

900237-ARP-ZZ-ZZ-RP-YE-00004

P02.3 | 20 March 2019

This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party.

Job number 244562

Ove Arup & Partners Ltd The Arup Campus Blythe Gate Blythe Valley Park Solihull B90 8AE United Kingdom www.arup.com

Document Verification

Job title A487 New Dyfi Bridge Job number 244562 Document title Statement to Inform an Appropriate File reference Assessment under the Conservation of Habitats and Species Regulations 2017 Document ref 900237-ARP-ZZ-ZZ-RP-YE-00004 Revision Date Filename 900237-ARP-ZZ-ZZ-RP-YE-00004.docx V1 18/03/ Description First Draft 2016

Prepared by Checked by Approved by Name Pete Wells Paul Clack

Signature P01.2 07/07/2 Filename 900237 -ARP-ZZ-ZZ-RP-YE-00004.docx 016 Description SIAA updated following Employers Agent Comments

Prepared by Checked by Approved by Name Pete Wells Paul Clack Paul Clack

Signature P01.3 16 Sep Filename 900237 -ARP-ZZ-ZZ-RP-YE-00004.docx 2016 Description

Prepared by Checked by Approved by Name Pete Wells Paul Clack Paul Clack

Signature

P02 01 May Filename 900237-ARP-ZZ-ZZ-RP-YE-00004.docx 2018 Description SIAA updated following NRW comments dated 17 October 2017

Prepared by Checked by Approved by Name Pete Wells Paul Clack Paul Clack

Signature Press Control+Shift+D to insert or Issue Document Verification with Document 

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Document Verification Page 2 of 2

Job title A487 New Dyfi Bridge Job number 244562 Document title Statement to Inform an Appropriate Assessment under File reference the Conservation of Habitats and Species Regulations 2017

Document ref 900237-ARP-ZZ-ZZ-RP-YE-00004 Revision Date Filename 900237-ARP-ZZ-ZZ-RP-YE-00004.docx900237-ARP-ZZ- P02.1 9 Oct Description SIAA ZZ-RP updated-YE-00004.docx following recent caselaw changes 2018

Prepared by Checked by Approved by Name Pete Wells Paul Clack Paul Clack

Signature P02.2 30 Nov Filename 900237-ARP-ZZ-ZZ-RP-YE-00004.docx 2018 Description SIAA updated incorporating Employers Agent comments

Prepared by Checked by Approved by Name Pete Wells Pau Clack Paul Clack

Signature

P2.3 20 Feb Filename 900237 -ARP-ZZ-ZZ-RP-YE-00004.docx 2019 Description SIAA updated incorporating EA and Welsh Government Comments

Prepared by Checked by Approved by Name Pete Wells

Signature

Filename Description

Prepared by Checked by Approved by Name

Signature

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Issue Document Verification with Document 

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Contents

Page

1 Executive Summary 1

2 Introduction 2

3 The Scheme 7

4 Methodology 25

5 Identification of European Sites 33

6 Identification of In-Combination Projects 40

7 Consultation 41

8 Consideration of the Significance of Potential Effects – Screening Stage 42

9 In-Combination Assessment 62

10 Appropriate Assessment 63

11 Monitoring 67

12 Conclusions 69

References

Appendices

Appendix A Scheme Design Drawings

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019

C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

1 Executive Summary

This report has been prepared to provide information to the Welsh Ministers (“the Competent Authority”) in the form of a draft Statement to Inform an Appropriate Assessment (SIAA) of the implications of the proposed A487 New Dyfi Bridge (the Scheme) on European Sites as required by Regulation 63 of the Conservation of Habitats and Species Regulations 2017 (as amended) (known as the ‘Habitats Regulations’). The potential for effects on the Dyfi Estuary Special Protection Area, the Pen Llyn a’r Sarnau Special Area of Conservation and the Merionydd Oakwoods and Bat Sites Special Area of Conservation have been considered within the Screening and Appropriate Assessment Stages of the Assessment of the Implications on European Sites process. The Screening Stage concluded that in the absence of mitigation there is the potential for effects on lesser horseshoe bats, otter and the habitat features of European Sites. Therefore an Appropriate Assessment has been undertaken in accordance with the requirements of the Habitats Regulations. It has been concluded that, assuming the implementation of mitigation measures, the proposed Scheme would not affect progress towards the achievement of any of the objectives for qualifying features of European Sites.

The assessment concluded that the residual effects of the Scheme would not affect the achievement of any of the conservation objectives set for European Sites considered.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 1 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

2 Introduction

2.1 Purpose 2.1.1 This report has been prepared to provide information to the Welsh Ministers (“the Competent Authority” on the implications of the proposed A487 New Dyfi Bridge Scheme (the Scheme) on European Sites, as required by Regulation 63 of the Conservation of Habitats and Species Regulations 2017. This report covers Stage 1 (Test of Likely Significant Effect) and Stage 2 (Appropriate Assessment) of the Assessment of the Implications on European Sites (AIES) process as set out in HD44/09 (HA, 2009).

2.2 Requirements of the Habitats Regulations 2.2.1 The Habitats Directive 92/43/EEC on the Conservation of Natural Habitats and Wild Flora and Fauna provides legal protection for habitats and species of European importance. The Directive is transposed into UK law by the Conservation of Habitats and Species Regulations 2017 (hereafter referred to as the ‘Habitats Regulations’). Before deciding to undertake or give authorisation for a plan or project the Welsh Government as a determining body and competent authority, must consider under the requirements of Regulation 63 whether the plan or project — 2.2.2 (a) is likely to have a significant effect on a European site (either alone or in combination with other plans or projects), and 2.2.3 (b) is not directly connected with or necessary to the management of that site, and in such cases they must make an appropriate assessment of the implications for that site in view of that site’s conservation objectives. 2.2.4 Where there is a Likely Significant Effect (LSE), (or such an effect cannot be discounted) and the plan or project is not connected with or necessary to the management of the site then the competent authority must make an ‘appropriate assessment’ of the implications for that site in view of its conservation objectives. 2.2.5 In the light of the conclusions of the assessment, the competent authority may agree to the plan or project only after having ascertained that the project will not, alone or in-combination with other plans and projects, adversely affect the integrity of the European site. The only exceptions are where there are no alternatives and there are imperative reasons of overriding public interest, in which case compensatory measures must be adopted if the Scheme is to proceed.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 2 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

2.3 Aims for this document 2.3.1 Therefore, the aims of this document are to provide information on the:  Identification of which European Sites are in the potential range of influence of the Scheme;  Identification of the potential of the Scheme to give rise to effects on European Sites;  Identification of the relevant qualifying interests/interest features of each European Site being considered;  Identification of the relevant Conservation Objectives of these features and European Sites;  Identification and characterisation of the potential impacts of the Scheme before mitigation;  Identification of others plans or projects which may cause effects on the European sites;  Characterisation of the significance of the potential in- combination effects with other plans and projects;  Consideration of effects in relation to Conservation Objectives;  Consideration of the potential for adverse effects on the integrity of the European Sites; and  Consideration of the possible mitigation measures to reduce the scale of any impacts.

2.4 Location of the proposed project 2.4.1 The Scheme is located on the A487 to Bangor Trunk Road which is the principal strategic south to north route along the west coast of . The Scheme is located immediately north of on the boundary between County and County where the A487 crosses the Afon Dyfi (as shown on Figure 1). The Scheme would tie into the existing A487, crossing the Afon Dyfi upstream of the existing road bridge - Pont-ar-Ddyfi and adjacent to the Millennium Bridge (foot and cycle-bridge 600 m east of Pont-ar-Ddyfi). 2.4.2 Pont-ar-Ddyfi is the first upstream crossing of the Afon Dyfi, approximately 8km west of the next road crossing at Jubilee Bridge, Grofft. The Scheme passes through the predominantly rural landscape of the Dyfi Valley and lies partly within the National Park, the boundary of which extends south of the river encompassing part of the valley floor. The Scheme also lies within the UNESCO Dyfi Biosphere Reserve, an area of terrestrial and coastal/marine ecosystems which is

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 3 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

internationally recognized within the framework of UNESCO’s Man and the Biosphere Programme.

2.5 Background 2.5.1 A timber bridge crossing the Afon Dyfi was first erected at this location in 1533 which was replaced by a masonry structure around 1681. The present five span masonry bridge was constructed in 1805 and is reputed to have been built on dry land and the river then diverted beneath the finished bridge. 2.5.2 In the last thirty years increased traffic and deterioration of the masonry structure has necessitated structural strengthening works and repairs to keep the bridge operational. In 1948 the bridge was locally ‘widened’ on the northern side to mitigate vehicle damage due to its narrow width and poor geometry. 2.5.3 There have been several studies into the area to look at operation, suitability, online and off-line improvements and traffic management. A Feasibility Study and a Technical Assessment Report were commissioned in 1996 from RUST Consultants, acting for Mid Wales Trunk Road Agency (MWTRA). In November 2000, Powys County Council acting in their capacity as MWRTA, were directed to review the earlier work and produce a Stage II Technical Appraisal Report and an accompanying Environmental Assessment. 2.5.4 In March 2003 MWTRA prepared the Stage II “A487 Fishguard to Bangor Trunk Road Pont ar Ddyfi Improvement - Technical Appraisal Report.” This was supported by an Environmental Statement and concluded that for the trunk road to remain accessible to traffic at all times the recommended option was to construct an offline multi-span viaduct across the floodplain. 2.5.5 Further details of the history of the Scheme development are set out in Chapter 3 (Alternatives Considered) of the Environmental Statement for the Scheme published in 2017.

2.6 Experience of the Authors of this Report 2.6.1 This report has been authored by Pete Wells. In addition the report has been reviewed and approved by Dr Paul Clack for issue by Arup. 2.6.2 Pete Wells BSc (Hons), MSc, CEnv, MCIEEM is a professional Ecologist with over 15 years of experience in project management, ecological surveys, assessment and the design of mitigation strategies. He is a specialist in ecology and mammal behaviour with experience in both environmental consultancies and statutory bodies and has specialised in undertaking Habitats Regulations Assessments. He was the

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 4 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

lead author of the Strategic Habitats Regulations Assessment for the M4 Corridor Around Newport Plan in 2014. 2.6.3 Dr Paul Clack PhD, BSc, CEnv, MCIEEM is an experienced ecologist/ornithologist and project manager with 15 years’ post- doctoral experience in ecological consultancy. Paul has completed many ecology inputs for development projects, including baseline surveys, impacts assessments and mitigation/enhancement schemes. He has been lead author for avian and non-avian chapters within Environmental Statements for projects across the UK and Europe. He also has considerable experience in working on plans and projects that may affect Natura 2000 sites and has produced Habitats Regulations Assessments for a variety of schemes. Paul was also involved in reviewing the Strategic Habitats Regulations Assessment for the M4 Corridor Around Newport Plan in 2014.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 5 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

2.7 Abbreviations 2.7.1 The following abbreviations are used in this report.

Abbreviation Expanded terms AIES Assessment of Implications on European Sites CIRIA Construction Industry Research and Information Association cSAC Candidate Special Area of Conservation DMRB Design Manual for Roads and Bridges EIA Environmental Impact Assessment GIS Geographical Information System LDP Local Development Plan NMUs Non-Motorised Users MWTRA Mid Wales Trunk Roads Agency NMWTRA North and Mid Wales Trunk Roads Agency NRW Natural Resources Wales PCC Powys County Council PEU Plainly Established and Uncontroversial PPG Pollution Prevention Guidelines pSPA Proposed Special Protection Area RTP Regional Transport Plan SAC Special Area of Conservation SIAA Statement to Inform an Appropriate Assessment SNP Snowdonia National Park SNPA Snowdonia National Park Authority SPA Special Protection Area TLSE Test of Likely Significant Effect TPOs Transport Planning Objectives UDP Unitary Development Plan WelTAG Welsh Transport Appraisal Guidance

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 6 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

3 The Scheme

3.1 Why the Scheme is needed 3.1.1 The A487 Fishguard to Bangor Trunk Road is the principal south to north coastal route in Wales. The highway links communities along the west coast and is also a popular tourist route carrying traffic through , , Powys and Gwynedd. More locally, the A487 provides links to services, retail, hospitals, education and work opportunities. 3.1.2 The existing A487 trunk road leading northwards from Machynlleth has been subject to increased traffic and repeated flooding. Pont-ar-Ddyfi is a pinch point on the network due to its narrow nature and the safety issues associated with the junction at the northern end. It has sub-standard visibility, is without footways and has poor turning geometry on the right- bank (Gwynedd) side. Existing (2015) Annual Average Daily Traffic (AADT) flows on the bridge are 2,384 in the northbound direction and 2,298 southbound. Heavy vehicle flows account for around 5% of daily traffic in both directions. The structure was not designed to carry the current volume and type of traffic. 3.1.3 The Afon Dyfi is subject to frequent flooding which inundates the A487 trunk road between Pont-ar-Ddyfi and the railway line just north of Machynlleth. As a result the A487 trunk road, between Pont-ar-Ddyfi and the railway line just north of Machynlleth are closed frequently, severing the local communities either side of the river. The profile of the existing road is shown on Figure 2. 3.1.4 Further closures result from accidents on Pont-ar-Ddyfi and associated bridge repairs. During bridge closures, trunk road traffic is required to take a diversion of up to 30 miles. A 10 mile diversion is available along the B4404 however this is not a feasible route option as a minor country road is unsuitable for the traffic flow of Heavy Goods Vehicles. 3.1.5 Local drainage improvements have been carried out over the last fifty years but the fundamental problem of flooding between Machynlleth and Pont-ar-Ddyfi has remained.

3.2 Alternatives Considered 3.2.1 There have been a number of studies looking in to the issue of flooding of the A487 between Machynlleth and Pont-ar-Ddyfi. These have included:  Feasibility Study and Technical Assessment Report, Powys County Council (1996); and

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 7 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 A487 Fishguard to Bangor Trunk Road; Pont ar Ddyfi Improvement - Technical Appraisal Report (March 2003).  WelTAG Planning Stage Appraisal (August 2011), which recommended the following four options to be considered further:  New crossing 200-500m upstream  New crossing 200-500m downstream  Widening & strengthening + flood mitigation + raise A487  Widening & strengthening + flood mitigation

Current Studies 3.2.2 A WelTAG Stage 1 Appraisal (2016) has been undertaken, which considered:  Option 1 New crossing 200m upstream  Option 2 New crossing 500m upstream  Option 3 New crossing 200-500m downstream  Option 4 Widening and strengthening, flood mitigation and raising of A487  Option 5 Widening and strengthening plus flood mitigation 3.2.3 Option 2 scored the highest in the appraisal against the Welsh Impact Areas, particularly in relation to the impact on the Environment. This option is furthest from the European sites within the Dyfi Estuary. 3.2.4 Following the completion of the WelTAG Stage 1 appraisal, option 2 was taken forward to be assessed at the scheme level (WelTAG Stage 2). The WelTAG Stage 2 appraisal confirmed the current scheme as the preferred option and supports the findings of the previous DMRB Stage II Assessment undertaken by Powys County Council.

Design Alternatives Considered Prior to Publication of Draft Orders 3.2.5 A conceptual design was issued on award of the Early Contractor Involvement contract for the Scheme in June 2015. The main components of the conceptual design included the following.  The proposed scheme consists of a new viaduct structure to cross the Afon Dyfi approximately 480m upstream of the existing bridge. At the northern end of the scheme the alignment ties into the existing A487 in the area of the

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 8 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

completed Ffridd Gate Improvement and the existing A487 would be renumbered as the A493, joining the new A487 alignment via a ghost island ‘tee’ junction. The scheme crosses the Afon Dyfi and floodplain on a structure, connecting via a short embankment to the existing A487 north of the Railway Bridge over the A487 on the edge of Machynlleth. The length of the proposed scheme is approximately 1100m with approximately 570m being on viaduct.  It is intended to de-trunk the existing A487 between the tie in points with the new scheme. Preliminary design indicates the viaduct spans being typically 1No. x 60m over the Afon Dyfi with 2No. x 35m,14No. x 30m and 1No. x 20m spans crossing the floodplain. The viaduct structure is assumed to be carried by single circular columns on piled foundations with the deck structure being continuous steel/concrete construction.  It is not within the scope of this scheme to solve the separate flooding mechanism below the Cambrian Line Railway Bridge which also interrupts the use of the A487. This will be addressed separately. 3.2.6 There have been a number of changes to the conceptual design prior to submission of the draft Statutory Orders are described below:  The conceptual design was approximately 1100m long with approximately 570m being on viaduct. The design was reviewed following flood modelling which indicated increases in flooding as a result of the Scheme. The adopted design is approximately 1200m with approximately 720m being on structures.  The conceptual design had a short embankment to tie into the existing A487, immediately north of the Dyfi Eco Park. The embankment encroached into the flood plain and restricted the conveyance of flow across it. The adopted design removed this by commencing the Scheme immediately north of the existing Cambrian Line Railway Bridge, moving the embankment south away from the flood plain.  Extended Viaduct - The conceptual design incorporated a river bridge with a span of 60m over the Afon Dyfi with 17 viaduct spans crossing the floodplain. The design was reviewed taking into account the desire to reduce the flooding caused by the Scheme. The adopted design includes a river bridge of 74m over the Afon Dyfi, with a 50m back span adjacent to the main river bridge. The viaduct across the flood plain to the south of the river bridge consists of 18 spans.  Northern Tie In – in the conceptual design the existing A487 would be realigned slightly to approach the new

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 9 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

A487 at near perpendicular. The design was reviewed following consultation with adjacent landowners. The adopted design reconfigures the Ffridd Farm access and includes a cattle underpass in front of the northern abutment to enable the farmer to get their animals from the farm, across the A493 south, under the River Bridge to the fields on the other side of the realigned A487. This underpass can also be used by animals such as bats, badger and otter.  Flood protection bunds –The conceptual design included a flood bund along the northern boundary of the Dyfi Eco Park. One of the changes to the conceptual design now incorporates a flood bund along the western verge of the A487 opposite the entrance to the Dyfi Eco Park.  Lighting - The conceptual design did not incorporate any road lighting as there was no specific requirement for highway lighting. As the southern limit of the Scheme has moved south towards Machynyllyth to accommodate the extended viaduct, there is a need to light the southern end of the scheme within the 30mph speed limit to replicate the existing provision.  Horizontal and Vertical Alignment - The horizontal alignment of the scheme has been adjusted at the southern end of the scheme adjacent to the Dyfi Eco Park to allow the construction of the approach embankment off line of the existing A487 in the field opposite the Dyfi Eco Park entrance.  Flood Mitigation - The design was reviewed following flood modelling which indicated increases in flooding as a result of the Scheme. The adopted Scheme now incorporates flood mitigation measures to ensure no increase in flood risk to the existing bridge and adjacent residential properties.  Railway Bridge Flooding –It was not within the original scope of the Scheme to solve the separate flooding issue which occurs below the Cambrian Line Railway Bridge. It was agreed following comments received at the Public Information Exhibition that the issue needs to be addressed as part of the Scheme. The adopted design now incorporates a new pumped drainage system to be installed adjacent to the existing Cambrian Line Railway Bridge to prevent flooding below the bridge. The pumped drainage system would discharge to the west of the flood bund via the normal highway drainage outfalls.

3.3 Aims of the Scheme 3.3.1 Eight Transport Planning Objectives (TPOs) were identified to be addressed by the Scheme and reported in the WelTAG Planning Stage Report as shown in Table 1.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 10 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Table 1 A487 New Dyfi Bridge Transport Planning Objectives

Reference Transport Planning Objective TP01 To improve reliability of crossing the Afon Dyfi for people, freight and emergency vehicles on the A487 strategic corridor. TP02 To improve efficient and reliable accessibility to key services including employment opportunities, healthcare and education. TP03 To maintain the role of Machynlleth as a vibrant and sustainable local centre. TP04 To preserve the long-term integrity of Pont-ar-Ddyfi TP05 To reduce the number and severity of collisions and casualties on the A487 in the study area. TP06 To ensure that flood risk to third parties is not increased. TP07 To minimise the impact of transport improvements on the landscape, biodiversity, water resources and heritage. TP08 To increase the opportunity for efficient, safe and reliable travel by walking and cycling on the A487 corridor within the study area.

3.4 Description of the Scheme 3.4.1 The scheme lies partly within Snowdonia National Park (SNP) and partly within its landscape setting. The receiving environment is highly sensitive. The Dyfi Estuary Special Protection Area, Dyfi Estuary and Cors Fochno Ramsar Site and the Pen Llŷn a’r Sarnau Special Area of Conservation are located approximately 4.6km to the south west. The Coedydd Derw a Safleoedd Ystlumod Meirion / Meirionydd Oakwoods and Bat Sites Special Area of Conservation is approximately 13.3km to the north of the Scheme. 3.4.2 The Scheme consists of a new section of single carriageway road. The typical carriageway width would be 9.3 m (excluding verges), which would consist of two 3.65 m wide lanes, with a 1 m hard strip on either side of the carriageway. In addition, the typical cross section would include 2.5 m grass verges along both sides of the proposed bypass, increasing in width to accommodate forward visibility requirements as required. The General Arrangement and Long Sections are provided in Appendix A. 3.4.3 The typical carriageway width would be the same on the proposed structures across the flood plain and river, although with a reduced verge width on the eastern side of the carriageway from 2.5 m to 0.6 m on the viaduct and bridge. The viaduct would accommodate a shared footway/cycleway and associated 1.4m high parapet.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 11 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

3.4.4 For most of its route, the Scheme would be elevated across a generally flat floodplain and at its highest point (on the river bridge over the Afon Dyfi) it would be some 9m above ground level. 3.4.5 The Scheme would not have road lighting, except at the southern end of the scheme within the 30mph speed limit, reflecting the existing situation. The requirement for the provision of highway lighting on the remainder of the Scheme has been assessed and concluded that there is no specific requirement for highway lighting. 3.4.6 The highway drainage would be predominately provided by a kerb and gully highway drainage system, with combined kerb drainage units provided on the viaduct. The proposed drainage catchments are shown on Figure 15.2 in Appendix A. The highway drainage systems would discharge at the following three locations described as follows:  Northern Junction and Tie-In – This catchment will predominantly use the existing drainage catchment on the existing A487 at the northern tie in with the Scheme. The existing drainage comprises a gulley and piped drainage network, and outfalls direct to the Afon Dyfi immediately downstream of the Millennium Bridge (approximately 7.4km upstream of the Pen Llŷn a’r Sarnau SAC boundary, 8km upstream of the SPA boundary and 8.9km upstream of the Ramsar site boundary). There is currently no existing treatment/ attenuation or isolation device for this outfall. It is proposed to install a petrol interceptor and isolation device (pen stock gate valve or similar) upstream of the outfall. This will help remove contaminants and provides a means by which spillages can be isolated.  Southern Tie-In – the existing highway at the railway bridge at the southern limit of the Scheme will be adapted to take drainage from the southern embankment and entrance to the Dyfi Eco Park. This will be discharged via an existing culvert under the railway embankment. It is assumed that the culvert connects to a network of ditches to the south of the railway. These also receive surface water and storm overflows from Machynlleth. The Machynlleth Sewage Treatment Works are also assumed to discharge in to the network of ditches. This watercourse flows in a south-westerly direction for approximately 2.3km before joining the Afon Dyfi 3.6km upstream of the Pen Llŷn a’r Sarnau SAC boundary.  Viaduct and Existing A487 – The viaduct catchment will capture water from the road surface via a kerb drainage system to the southern abutment. The drainage system will then discharge in to the existing ditch to the east of the existing A487. This ditch will be re-profiled to flow from

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 12 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

south to north (rather than north to south) to an existing culvert under the existing A48. A new ditch will be dug from the culvert to the Afon Dyfi on the western side of the existing A487. A petrol interceptor and isolation device (pen stock gate valve or similar) will be included within the pipe network prior to being discharged to the ditch. This will provide treatment and a means of short term isolation even during a flooding event. Further treatment may be provided by ditch vegetation, and further means of isolation by an isolation device (stop logs or similar) located upstream of the culvert under the existing A487. The ditch from the outfall to the Afon Dyfi is approximately 420m long and the discharge into the Afon Dyfi is approximately 7km upstream of the Pen Llŷn a’r Sarnau SAC boundary. 3.4.7 The existing A487 would be de-trunked between the connection with the Scheme at the southern end and a point approximately 40m south of the existing Pont-ar-Ddyfi. 3.4.8 A short section of the existing A487 would be stopped up approximately 40m south of the Afon Dyfi. The Pont-ar-Ddyfi and approximately 40m section of the existing A487 to the south of the river would be restricted to Non-Motorised Users (NMUs) and authorised vehicles only. Fixed and de-mountable bollards would be used to control vehicular access onto Pont ar Ddyfi. These would be carefully selected in agreement between the landscape architect and the heritage consultant in consultation with Cadw to ensure their design (scale, colour and materials) complements the fabric and historic setting of Pont ar Ddyfi and nearby dwellings. 3.4.9 The existing A487 south of the stopping up would be retained as a means of access for landowners and statutory undertakers. A short section of the existing 2 lane carriageway would be converted to single lane, with the second lane converted to several parking spaces for anglers or walkers. 3.4.10 No vehicular through access would be provided along the old route, with only a Non-Motorised User (NMU) connection provided between the existing A487 south and the Pont-ar- Ddyfi. The existing NMU route along the west side of the existing A487 will be retained. 3.4.11 In addition to the new section of highway, a flood bund will be created along the northern boundary of the Dyfi Eco Park and from the proposed highway embankment to the railway line on the western side of the Scheme opposite the entrance to the Dyfi Eco Park. There will also be small scale drainage works to alleviate flooding at the residential properties to the north of the existing Pont-ar-Ddyfi.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 13 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Landtake, Resources, Emissions and Waste Products 3.4.12 The footprint of the scheme is approximately 102,000m² (10.2ha) within the Compulsory Purchase Order boundary. However where possible the footprint of construction activities will be kept as small as possible and field boundaries will be retained on the boundaries of areas used as lay-down areas. 3.4.13 The types and provisional estimated quantities of materials required for the construction and phase of the Scheme are listed in Table 2 below. Table 2 Summary of the material resources associated with the construction phase of the proposed Scheme

Project Material resources Quantities of Additional Activity generated/required material resources information on for the project generated/required material resources Earthworks Excavated material North of the river: Total cut material = 16,650 m³ 16,950 m3 South of the river: 300 m³ Placed material North of the river: Total fill material = 2,250 m³ 20,350 m3 South of the river (including flood bunds): 18,100 m³ Any excess material Approx. 3,400 m³ Sourced from local required supplier where possible Any material Exact quantities Sourced from local replacing the unknown supplier where invasive plant possible. species and associated removed material Site Concrete 6,465 m³ Sourced from local construction supplier where possible. Steel reinforcement 1,220 tonnes Sourced from local supplier where possible. Metal parapet (1.4m 1.5km length Sourced from local high) supplier where possible. Verge fill 675 m³ Sourced from local supplier where possible.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 14 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Waterproofing spray To cover an area of Sourced from local 9000 m² supplier where possible. Silane impregnant To cover an area of Sourced from local 1,800 m² supplier where possible. Carriageway To cover an area of Sourced from local surfacing 1,800 m³ supplier where possible. (Painted) Structural 1,750 tonnes Sourced from local steel supplier where possible. Paint TBC Sourced from local supplier where possible. Bearings 50 Sourced from local supplier where possible. Expansion joints 35 m length Sourced from local supplier where possible. Drideck (or similar) To cover a length of Sourced from local 1.5 km supplier where possible. Envirodeck (or To cover a length of Sourced from local similar) 1.5 km supplier where possible. Gravel / crushed 5,000 m³ For the temporary stone laydown areas, haul road and piling mats.

3.4.14 During construction, it is proposed that all materials arising from construction would be re-used on site in accordance with the waste hierarchy defined within the Waste Framework Directive. 3.4.15 The types and provisional estimated quantities of waste arisings associated with the construction operational phase of the Scheme are listed in Table 3. Table 3 Summary of the waste arisings associated with the construction phase of the Scheme

Project Waste arisings Quantities Conversion in Additional information Activity from the project of waste tonnes* on waste arisings arisings (where applicable) Earthworks Invasive non- Exact n/a Indian balsam is along native species quantities not field boundaries and (INNS) including known. ditches. Japanese Locations Japanese knotweed is are indicated widespread throughout

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 15 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

knotweed and in Volume 2 the Study Area; along the Indian balsam. Figures 9.4, Afon Dyfi banks, within 9.5, 9.6 and woodland areas to the 9.7 of the north of the river and Environment within hedgerows and al Statement treelines in the western area, at the boundary of the Dyfi Eco Park and in the north-eastern areas

Soil Exact n/a Surplus topsoil will be quantities not generated throughout known. construction, including the cut and fill, and the strip for the laydown areas, haul road and piling mats. Demolition Metals 0.5 tonnes n/a Iron and steel (lighting columns). Mixed 53.5 tonnes n/a Fencing, road signage, construction and gates, walls demolition wastes

Site Surplus concrete 40m³ 50.8 tonnes Surplus of pours. construction Disposed of off-site. Packaging 180 tonnes n/a Total over construction domestic waste period (2 skips per (general waste month) from compound area and welfare set-up) Liquid waste from TBC n/a Tanker to be emptied. septic tank Crushed stone 3200 to 4000 to 8000 (material imported 6400m³ tonnes for temporary launch platform) *Conversion factors for each material sourced from Appendix 9 of Wales Construction and Demolition Waste Generation Survey 2012 to allow for calculation of total waste in tonnage.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 16 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

3.5 Construction Methodology 3.5.1 This section details the main construction activities that are expected to take place during enabling works and construction of the proposed single carriageway, junctions, bridge and viaduct, and proposed flood bunds (collectively the Scheme). 3.5.2 For the purpose of this Statement assumptions have been made on construction activities based upon the team’s experience and input from the Contractor. It is not anticipated that these will change during the detailed design phase. Programme 3.5.3 The start date for the construction phase would depend upon a number of factors including the successful completion of the Statutory Processes into making the Orders to construct the Scheme, the availability of Welsh Government funding and the formal signing of the contract to construct the works. 3.5.4 It is currently anticipated that the construction activities for the Scheme would commence in 2020. 3.5.5 For the purpose of this Statement the Proposed Scheme Opening and Design Years have been taken as 2022 and 2034 respectively. 3.5.6 The construction programme would be finalised by the main contractor in advance of the works. The duration of the works is currently estimated to require a construction period of 25 months, including advance works/vegetation clearance/utility diversions, archaeological testing and de-trunking of the existing road. However, depending on the final earthworks strategy this could increase or reduce slightly. Following construction there will be a 36 month environmental aftercare period for monitoring and maintenance.

Sequence of Construction Activities 3.5.7 The construction activities for the Scheme would be typical of a major road scheme and consist of the following:  Advance/preparatory works likely to be undertaken prior to construction;  Site establishment and vegetation clearance;  Main construction works involved in the scheme drainage, earthworks, and creation of a flood bund at the southern end of the Scheme;  Main viaduct and bridge structure construction;  Road works and other associated structures;

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 17 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 Localised flood protection measures at properties north of the existing Pont-ar-Ddyfi; and  Final tie-ins and soft landscape works. 3.5.8 Works will be undertaken throughout the construction area as there is a need to reuse material from the north of the Scheme in the embankment and bunds in the south of the Scheme 3.5.9 Pre-works would be undertaken at the start of the construction stage. The initial phase of earthworks would be the excavation associated with the flood alleviation measures and the northern junction, allowing a realignment of the A487, and generating material for the southern approach embankment and the flood bunds, refer to Figure 1 Scheme General Arrangement. 3.5.10 The southern approach embankment would then be constructed, and the temporary platform/embankment to allow the erection and push launch of the main viaduct. 3.5.11 The flood plain viaduct and main river bridge would then be constructed from both the north and south of the river.

Key Construction Activities 3.5.12 Advance/Preparatory Works - There are a number of major services that are impacted by the Scheme, including electricity, telecoms, gas pipeline and water supplies. During the early phases of the construction works, and potentially before any major construction works the diversion/protection of the various utilities would be undertaken where possible. Other diversions works may follow aligned with construction phasing. Pre- construction ecological checks would be undertaken prior to site clearance. 3.5.13 Archaeological Investigations - Advanced archaeological surveys and watching briefs would be undertaken in the early stages of the project, through a supervised topsoil strip and/or trial trenching. 3.5.14 Site Clearance - The initial activities following site establishment would be fencing (including ecological fencing as required), site clearance, the installation of pre-earthworks drainage and topsoil strip under archaeological supervision where identified as required. 3.5.15 Earthworks - Following the topsoil strip the major earthworks can begin. Where possible earthworks material would be derived from on-site (i.e. re-use of onsite cut for fill sections), although some higher quality material may be imported to form the base for the carriageway (capping/sub-base) and backfill to the proposed structures.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 18 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

3.5.16 Drainage - Pollution prevention measures would be implemented to ensure that land and rivers are not contaminated. A Surface Water Management Plan would be developed and temporary settlement ponds and cut-off ditches would be designed into the works and installed before the bulk earthworks and piling were undertaken. Where possible the permanent drainage attenuation ponds would be installed early and used in the construction phase. 3.5.17 Flood Plain Viaduct - The structural works for the viaduct would commence with the installation of a temporary piling platform/haul road to allow the installation of the piles, followed by the pier construction. The piling and pier construction would be undertaken south to north. Once the initial piles and piers are complete the focus of the bridge works would be on the erection of the viaduct deck from the southern abutment. The southern spans on the right hand bend would the lifted in from ground level. Thereafter the pre-cast bridge deck units will be assembled and ‘pushed’ (using a method known as push launch) from the completed sections to extend the viaduct northwards towards the Afon Dyfi. The push launch method has the following advantages:  Minimise disturbance to the surroundings including the sensitive areas such as the Afon Dyfi and areas of mature woodland;  Reduce the risk of potential environmental incident – silt pollution/fuel spills etc by minimising works within the flood plain. 3.5.18 Main River Bridge - The main river bridge works would be undertaken in parallel with the viaduct works, starting with the installation of the piles associated with the northern abutment. The piers at the southern end of the main span and back spans would be constructed in parallel with the viaduct piles/piers. Once complete the main span beams would be lifted into place from the north of the river, with back span beams lifted in from a temporary platform on the south of the river. The lifting of the bridge beams would be followed by completion of the bridge deck and installation of the parapets. 3.5.19 Highways and Surfacing Works - On completion of the viaduct and bridge the final highways works, surfacing, barrier, etc would be installed and the road opened. At which point other works associated with the de-trunking would be completed.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 19 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Compounds, Working Hours and Construction Equipment 3.5.20 The location of the main construction compound will determined during the detailed design stage, however it will not be within the flood plain. Lay down areas and crane pads will be required within the floodplain, and a satellite compound and lay down area will be located at the northern end of the Scheme. These areas are shown on Figure 1. The main site compound would be lit at night for security purposes; the satellite compounds may require lighting for security purposes depending on their location and size. Where lighting is required this would be restricted to light the compound area only without light spill to adjacent areas of vegetation. 3.5.21 Stockpile areas for topsoil would be located in the immediate vicinity of the earthworks but outside of the flood plain. 3.5.22 The working day would vary between the seasons. However, it would typically be Monday – Friday 7am to 7pm in the summer months and 7am to 5pm in the winter. Weekend or night work would be required in some instances, typically for works on or adjacent to existing highways. These instances would be kept to a minimum and require agreement with Welsh Government beforehand. Working hours will be restricted in the vicinity of the Afon Dyfi. 3.5.23 In terms of construction plant and equipment, the site clearance phase of the works is likely to involve use of chainsaws and excavators. The bulk earthworks would be constructed using articulated dump trucks, excavators up to 35T capacity, dozers and rollers. The new structures would be constructed using cranes, telescopic boom lifts, piling rigs and telescopic forklifts. Task lighting at structure locations during the winter months only, and other locations where required, would also be provided.

Traffic Management and Construction Routes 3.5.24 The existing A487 road carries significant volumes of vehicles throughout the day and night, however because the majority of the Scheme is being constructed offline, conflict with this traffic would be limited. When work is required online, a series of traffic management measures would be implemented including:  Early construction of realigned A487 at southern and northern ends to move traffic away from construction works and facilitate construction of bridge,  Single way working of traffic in each direction maintained at all times, and

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 20 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 Speed restriction in work areas for the safety of road users and the construction workforce. These restrictions would only be introduced when the works commence and would remain until a specific section was complete. 3.5.25 The existing A487 would serve as the main access to the construction site for construction and workforce movements. All haul routes would be internal and access points to the site would be via the existing A487. It is envisaged that the Scheme could generate up to approximately 10 total workforce trips (to and from site) per day, and approximately 15 total construction vehicle trips (to and from site) per day.

Site set-up, clearance and reinstatement 3.5.26 Fencing around compounds would be standard 2m high Heras- type security fencing, but fitted with an olive green netting to minimise its visual prominence and to heavily filter views into the low level construction activities and stockpiles within the compounds. 3.5.27 Topsoil displaced by the scheme or temporarily removed to accommodate the construction works would be handled and stored on site outside of the flood plain and in accordance with BS 3882:2015 Specification for topsoil, Annex A; Recommendations for stripping, handling and preparing topsoil. 3.5.28 Once construction is complete, hard standings and elements associated with compounds, haul roads crane pads or other temporary installations would be completely removed from site and the ground made good, topsoil replaced, cultivated and re- seeded with an appropriate lowland meadow grass mix to reinstate its existing use and condition.

Vegetation clearance 3.5.29 Vegetation clearance would be undertaken with great care to remove the minimum necessary and to protect and retain adjacent vegetation. Trees to be retained would be protected with fencing in accordance with British Standard BS 5837:2012 Trees in relation to design, demolition and construction and as shown on the Tree Protection Plan (TPP) in the arboricultural report. These works would be undertaken outside of the bird nesting season (March to September inclusive) and would be supervised by a suitably qualified Environmental Clerk of Works.

Lighting 3.5.30 Site lighting would be required during working hours and for general security during the construction phase. SNP is

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 21 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

designated as a Dark Skies Reserve. The Scheme lies within this designation and entirely within an area classified as Intrinsically Dark (Environmental Zone E1, Institute of Lighting Professionals). There would be two type of lighting required on site during the construction phase, construction task lighting and security lighting. 3.5.31 Security lighting would be limited to construction compounds and lay down areas where plant and materials are left overnight. This would be minimised and not located near to the river corridor. Such lighting would also be designed to not shine on riparian vegetation or the water surface of the Afon Dyfi. 3.5.32 Construction task lighting would be limited to the winter months when it is dark for a limited period at the beginning or end of the working day. This would be intermittent and would be dynamic and change location and intensity as the construction actives demand. There would be restrictions on working hours in the vicinity of the Afon Dyfi and northern extent of the scheme to avoid night working thus avoid the need for any task lighting along the dark river corridor. 3.5.33 Where it is necessary to use security and construction task lighting, this would be low level and fully cut-off or “fully shielded” in order to minimise adverse light pollution effects on the protected night time environment. 3.5.34 The existing street lighting at the southern end of the Scheme will be replicated on the proposed alignment with street lighting limited to within the 30mph zone. The junction at the northern end of the Scheme does not require street lighting. Signage proposed within the Scheme will be unlit with the exception of the speed limit signs on the approach to Machynlleth.

Construction Environmental Management Plan 3.5.35 As part of the Environmental Impact Assessment process a draft Construction Environmental Management Plan (CEMP) has been prepared and is included within the Environmental Statement for the Scheme.

Long-term management 3.5.36 The Project Team would carry out environmental monitoring, aftercare and management for the three year Aftercare Period following completion of the works. This would be undertaken in accordance with an agreed Environmental, Landscape and Ecology, Monitoring, Aftercare and Management Plan. 3.5.37 During the Aftercare Period, the Project Team would review the effectiveness of the environmental mitigation against their

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 22 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

intended function as identified within the Environmental Statement and this Statement and would provide any remedial actions if required. 3.5.38 At the completion of this three year Aftercare Period, the management of the soft estate and environmental mitigation measures would be transferred to the North and Mid Wales (NMWTRA). The Project Team would prepare a ten year Handover Environmental Management Plan (HEMP), which would set out on-going maintenance, management and monitoring actions.

3.6 Description of the Study Area 3.6.1 The Study Area used for gathering baseline ecological information from survey work includes an area extending up to 500m from the extent of the proposed construction work. This area is predominantly grazed pasture on the flood plain of the Afon Dyfi along with areas of broad leaved woodland and pasture on the south facing slopes north of the river. 3.6.2 The Dyfi Estuary Special Protection Area, Dyfi Estuary and Cors Fochno Ramsar Site Pen Llŷn a’r Sarnau Special Area of Conservation are located approximately 3.8km to the south west of the Study Area. The Coedydd Derw a Safleoedd Ystlumod Meirion / Meirionydd Oakwoods and Bat Sites Special Area of Conservation is approximately 12.7km to the north of the Scheme. 3.6.3 The area to the north-east of the Study Area (north of the Millennium Bridge over the Afon Dyfi) comprises areas of improved and poor semi-improved grassland, grazed by sheep. Parallel to the A487 is an area of stone outcrops, mapped as basic inland cliff, and bracken (Pteridium aquilinum) slopes. There is an area of broad-leaved woodland on the north- western boundary bordering the river containing species such as sycamore (Acer pseudoplatanus), ash (Fraxinus excelsior), alder (Alnus glutinosa), oak (Quercus sp.), crack willow (Salix fragilis) and goat willow (Salix caprea). Japanese knotweed (Fallopia japonica) and Indian balsam (Impatiens glandulifera) are present within the understorey. 3.6.4 The Afon Dyfi intersects the Study Area and is bordered by areas of broad-leaved woodland, scattered scrub, improved and poor-semi-improved grassland and shingle beaches. Japanese knotweed and Indian balsam are widespread along the course, mainly throughout the woodland area on the northern bank. 3.6.5 The area to the south of the Millennium Bridge and the Afon Dyfi consists of improved and poor semi-improved grassland on the flood plain of the river. This are is subject to heavy grazing

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 23 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

and contains areas of marshy grassland and flush within semi- improved and improved fields. Fields within the centre of the Study Area are bordered by fence lines with scattered broad- leaved trees and scattered scrub, and defunct species-rich hedgerows. 3.6.6 The fields on the western boundary of the Study Area are bordered by intact species-rich hedgerows, running along both sides of the A487. 3.6.7 There are a number of ponds and ditches throughout the Study Area, located at field boundaries within hedgerows and fence- lines with trees. There is a canalised roadside ditch running along the A487 on the western site boundary, parallel to a hedgerow.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 24 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

4 Methodology

4.1.1 All plans and projects should identify any potential impacts on European Sites early in the plan-making process and then seek to alter the plan or project to avoid them or introduce mitigation measures to the point where no significant effects remain. The ‘Competent Authority’ shall agree to the plan or project only after having ascertained that it will not adversely affect the integrity of a European site or sites in accordance with the requirements of the Habitats Regulations (Regulation 61(5)). Regulation 61(3) requires the Competent Authority to consult with the Statutory Nature Conservation Body (Natural Resources Wales) and have regard to any representations made by that body. 4.1.2 European Sites include Special Areas of Conservation (SACs), candidate SACs (cSACs), Offshore Marine SACs and Special Protection Areas (SPAs). However, it is government policy in England and Wales to also include Wetlands of International Importance (Ramsar sites), potential SPAs (pSPAs) and possible Ramsar sites as European Sites. 4.1.3 For highway schemes the consideration of projects under the requirements of the Habitats Regulations is known as the Assessment of Implications on European Sites (AIES) but is equivalent to the consideration of other projects or plans, comprising a screening stage (i.e. consideration of likely significant effects) and an Appropriate Assessment stage (consideration of effects in relation to the conservation objectives). Box 1 overleaf shows an overview of the AIES process as provided within the Design Manual for Roads and Bridges Vol. 11, Section 4 HD44/09: Assessment of Implications (of Highways and/or Roads Projects) on European Sites (including Appropriate Assessment).

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 25 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Box 1: Flow diagram showing the AIES process taken from HD44/09

4.2 Policy and Guidance 4.2.1 The consideration of The Scheme in relation to the Habitats Regulations has been informed by a range of guidance and policy documents including:  Design Manual for Road and Bridges (DMRB) HD 44/09. Assessment of implications (of Highways and/or Roads Projects) on European Sites (including Appropriate Assessment) (HA, 2009);  The Habitats Regulations Handbook (Tyldesley & Chapman, The Habitats Regulations Handbook, 2013), and subsequent updates;  Assessing Projects under the Habitats Directive: Guidance for Competent Authorities (Tyldesley D. , 2011)

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 26 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

4.3 Evidence Base 4.3.1 The following websites were used to gather information on the European protected sites:  Joint Nature Conservation Committee (JNCC, 2016);  Natural Resources Wales (NRW) (NRW, 2016). 4.3.2 Core Site Management Plans published by NRW were used to gather information on European protected sites. These documents provide the main elements of NRW’s management plan for protected sites and sets out what needs to be achieved on the sites, the results of monitoring and advice on the actions required. The Geographical Information Systems (GIS) datasets for European sites used were downloaded from NRW to ensure all relevant European sites and their updated boundaries were taken into consideration. 4.3.3 A desk study has been undertaken to review records of species which are features of designated sites considered within this document. These have included records of otters, bats and birds from both Cofnod (the Environmental Records Centre) and the Biological Information Service (BIS) which covers mid Wales. In addition records for lesser horseshoe bats have also been sought from the National Biodiversity Network (NBN) interactive map website. 4.3.4 A comprehensive suite of ecological surveys have been undertaken to provide evidence for this assessment and were undertaken as part of the Environmental Impact Assessment (EIA) process. 4.3.5 Specific surveys relevant to the European sites have been undertaken for:  wintering birds, aimed at determining the presence or likely absence of Greenland white-fronted geese (Anser albifrons flavirostris) in the vicinity of The Scheme;  Bats, including assessment of potential roosts, transect surveys and static activity monitoring to determine the presence and level of activity of lesser horseshoe bats; and  Otters, aimed at determining the presence of active holts and the level of activity on the Afon Dyfi and other water bodies. 4.3.6 No white-fronted geese were recorded during the surveys. 4.3.7 Lesser horseshoe bats were recorded by static detectors on a hedge within floodplain in August (1 pass over two nights) and on the northern bank of the Afon Dyfi on several occasions in

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 27 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

September 2015, April 2016 and June 2016. No lesser horseshoe bats were recorded during walked transects. 4.3.8 A confirmed otter holt was identified approximately 400m upstream of the proposed crossing of the Afon Dyfi on the north bank of the Afon Dyfi near to the confluence of the Afon Dulas. Camera monitoring of this feature, a hole approximately halfway up the river bank, showed it to be being used by a single adult otter on a regular basis. Potential resting places were also recorded immediately downstream of the retaining wall supporting the existing A487 on the north bank (approximately 60m from the proposed crossing) and on the Afon Dulas. Camera monitoring of the feature near the retaining wall, overhanging tree roots, revealed no use by otters over a period of one month. It is therefore considered unlikely that this is being used as a resting place by otter but it has potential to be used.

4.4 Assessment Methodology 4.4.1 This section provides the applicable methodologies and assumptions for the consideration of the Scheme with regard to the requirements of the Habitats Regulations. 4.4.2 The assessment process has been based on that set out in HD44/09 (HA, 2009) and the Habitats Regulations Handbook (Tyldesley & Chapman, 2013) . The consideration of The Scheme was undertaken in the following step by step process.

Identifying sites 4.4.3 The first step of the process was to identify all the European sites within the consideration of the assessment. Certain species which are part of the designated features of some European sites are not restricted to the defined boundaries of the site but can be highly mobile with ranges well outside the defined area of the sites. 4.4.4 HD44/09 sets out the following consideration zones for the identification of European Sites for inclusion in the assessment where the project is:  Within any SAC, SPA or Ramsar Site;  Within 2km of any SAC, SPA or Ramsar Site;  Within 30km of any SAC where bats are one of the qualifying interests; or  Crossing or adjacent to, upstream or downstream of watercourses designated as SAC.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 28 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

4.4.5 In line with HD44/09 professional judgement has been exercised when considering the effect pathways on mobile species which occupy land outside of the designated site boundary but which are nonetheless, qualifying interests of the sites. 4.4.6 For the purpose of simplicity and openness a 30km buffer around The Scheme has been used to identify European Sites, which have then been scoped out if no pathways exist to link potential impacts from The Scheme (source) to features of European Sites (receptors). 4.4.7 The sites which need to be considered for assessment in terms of air quality effects are those within very close proximity (normally within 200m) of the affected road network as set out in HA207/07 (HA, 2007).

Understanding European Site features and conservation objectives 4.4.8 Conservation objectives of each interest feature of each European Site potentially affected were acquired and examined. In Wales, conservation objectives are considered to consist of the vision and performance indicators stated in the relevant Core Management Plan available from Natural Resources Wales’s website. For each of the sites the relevant qualifying interests were also collated and examined.

Identification of plans or projects considered for in- combination effects 4.4.9 It is a requirement of the Habitat Regulations to examine the potential for a plan or project to have a significant effect either alone or in combination with other plans and projects. It is therefore necessary to identify those other plans and projects which may give rise to in-combination effects with The Scheme. 4.4.10 To inform this process, plans and projects which have a spatial context and contain plans or proposals most likely to have in- combination effects, were identified from the following locations:  Welsh Government – strategies, plans and guidance;  Local Authority/National Plan Authorities – LDP/UDP;  Statutory Environment Bodies – Management Plans;  Regional Authorities – Regional Transport Plans (RTP)1;  Powys Local Development Plan (LDP) 2011-2026; and

1 The Regional Transport Plan is due to be superseded by the Mid Wales Joint Local Transport Plan 2015 – 2020 once it is adopted.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 29 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 Eryri Local Development Plan (2007 - 2022) adopted by the Snowdonia National Park Authority. 4.4.11 In addition to the in-combination effects of other plans and projects, other elements considered with this assessment include:  Developments and other projects which are currently under construction; and  Proposed developments which are currently under consideration with the local planning authority or other determining bodies. 4.4.12 When considering in-combination effects in the assessments for each site, the potential impact of the measure on the feature is the key consideration. A plan or project could have an effect on water quality which can alter the nutrient balance on a site/feature without causing any potential effects to air quality, but such an effect could still be significant when considered in- combination with air quality impacts resulting from another plan or project.

Identification of the potential impacts of The Scheme 4.4.13 The construction and operation of The Scheme has the potential to give rise to the following impacts on European Sites:  Habitat loss and/or fragmentation (including foraging areas) including interruption of flight lines and restrictions to species movements;  Loss of resting/roosting sites;  Air quality emissions and changes to atmospheric deposition;  Changes in water quality and quantity;  Changes in hydrological conditions;  Changes to structure/composition of the habitat, including the colonisation of habitats by invasive non-native species;  Noise and vibration disturbance to species;  Visual and lighting disturbance to species;  Physical restrictions to the movement of species; and  Mortality or injury of species as a result of collision with moving vehicles. 4.4.14 This list has formed the basis for considering the potential for effects on the European Sites on the basis of identifying the

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 30 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

sources or impacts and the pathways that could link those sources to the features of the site (receptors). 4.4.15 The consideration of the potential for impacts has also been informed by the conservation objectives for the features of the European Sites identified. In particular details of the vulnerability of features to particular potentially influencing factors (such as the vulnerability of certain habitats to increases in nitrogen deposition) were used to identify the likelihood of impacts affecting features of the sites. 4.4.16 Although effects arising from vehicle emissions are largely limited to a zone approximately 200m either side of road corridors, there is a potential pathway for effects through the conveyance of pollutants such as nitrogen deposition via the Afon Dyfi.

Consideration of the significance of the potential effects 4.4.17 The significance of the potential effects was assessed in the absence of mitigation measures apart from activities which are standard practice within the UK Construction industry or otherwise required by UK law. 4.4.18 In the assessment professional judgement has been applied using the following criteria, as often insufficient information about the elements and interests is available:  The vulnerability/sensitivity of the receiving environment/features of interest;  When the risk of effects are likely to occur (e.g. construction and/or operation);  The likely geographical extent of the effects; and  Likelihood of significant effects (e.g. those above negligible in magnitude) occurring based on previous experience with similar elements, where available. 4.4.19 The assessment of the likelihood of significant effects has been made of the Scheme on its own and in-combination with other plans and projects.

4.5 The Use of Professional Judgement 4.5.1 Professional judgement was used in the carrying out of this work where specific guidance was not available, and in the interpretation of results. Where there was insufficient information regarding the likelihood of qualifying interests being present, or of the risk of impacts, the assessment used the precautionary principle to inform the judgement. The

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 31 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

precautionary principle has been applied to ensure that any assessment errs on the side of caution, without being overly cautious. This principle means that the conservation objectives should prevail where there is uncertainty or that harmful effects will be assumed in the absence of evidence to the contrary. 4.5.2 The approach has been to identify risks on the basis of the precautionary principle. This principle means that the conservation objectives should prevail where there is uncertainty or that significant or adverse effects will be assumed in the absence of evidence to the contrary. The SIAA has therefore considered the worst-case scenario.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 32 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

5 Identification of European Sites

5.1.1 Twenty-three European Sites have been identified within the 30km search area around The Scheme. These comprise:  One Ramsar Site;  Six Special Protection Areas;  Fifteen Special Areas of Conservation; and  One candidate Special Area of Conservation. 5.1.2 The European Sites, their features and the distance of the sites from The Scheme are shown in Table 4 below and on Figure 4.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 33 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Table 4: European Sites within 30km of the Scheme

Site Distance Qualifying Features Pen Llyn a'r 4.3km 1110 Sandbanks which are slightly covered by seawater all the time Sarnau/Lleyn 1130 Estuaries Peninsula and the Sarnau SAC 1150 Coastal lagoons 1160 Large shallow inlets and bays 1170 Reefs 1140 Mudflats and sandflats not covered by seawater at low tide 1310 Salicornia and other annuals colonizing mud and sand 1330 Atlantic salt meadows (Glauco-Puccinellietalia maritimae) 8330 Submerged or partially submerged sea caves 1349 Bottlenose dolphin 1355 Otter 1364 Grey seal Dyfi Estuary / Aber 5km Dyfi SPA A395 Greenland white-fronted goose (wintering) Cors Fochno and 6km 7110 Active raised bogs Dyfi Ramsar 7120 Degraded raised bogs still capable of natural regeneration 7150 Depressions on peat substrates of the Rhynchosporion Cadair Idris SAC 6.6km 3130 Oligotrophic to mesotrophic standing waters with vegetation 8110 Siliceous scree of the montane to snow levels 8210 Calcareous rocky slopes with chasmophytic vegetation

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 34 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features 8220 Siliceous rocky slopes with chasmophytic vegetation 4010 Northern Atlantic wet heaths with Erica tetralix 4030 European dry heaths 6410 Molinia meadows on calcareous, peaty or clayey-silt-laden soils 6430 Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels 7130 Blanket bogs 7230 Alkaline fens 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles 1065 Marsh fritillary butterfly 1393 Slender green feather-moss Coed Cwm Einion 8.3km SAC 9180 Tilio-Acerion forests of slopes, screes and ravines Craig yr Aderyn 10.9km SPA A346 Chough (summer and winter) Coedydd Derw a 13.2km 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles Safleoedd Ystlumod 91E0 Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alno incanae, Salicion albae) Meirion / Meirionydd 3260 Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion Oakwoods and Bat vegetation Sites SAC 4010 Northern Atlantic wet heaths with Erica tetralix 4030 European dry heaths 9180 Tilio-Acerion forests of slopes, screes and ravines 91D0 Bog woodland

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 35 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features 1303 Lesser horseshoe bat Cors Fochno SAC 13.8km 7110 Active raised bogs 7120 Degraded raised bogs still capable of natural regeneration 7150 Depressions on peat substrates of the Rhynchosporion West Wales 15.8km Marine/Gorllewin Cymru Forol cSAC 1351 Harbour porpoise Phocoena phocoena Northern Cardigan 16.5km Bay /Gogledd Bae Ceredigion SPA A001 Red throated diver Afon Eden - Cors 17.2km 7110 Active raised bogs Goch 1029 Freshwater pearl mussel SAC 1831 Floating water-plantain 1106 Atlantic salmon 1355 Otter Berwyn SPA 18.7km A082 Hen Harrier (breeding) A098 Merlin (breeding) A103 Peregrine (breeding) A074 Red kite (breeding) Berwyn a 18.7km 4030 European dry heaths Mynyddoedd de 7130 Blanket bogs Clwyd / Berwyn and 6210 Semi-natural dry grasslands and scrubland facies on calcareous substrates

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 36 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features South Clwyd 7140 Transition mires and quaking bogs Mountains SAC 8120 Calcareous and calcshist screes of the montane to alpine levels 8210 Calcareous rocky slopes with chasmophytic vegetation Coedydd Llawr-y- 19.8km glyn SAC 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles Ellenydd - Mallaen 20km A098 Merlin (breeding) SPA A074 Red kite (breeding) A103 Peregrine (breeding) Coedydd a 20.5km Cheunant Rheidol/Rheidol Woods and Gorge SAC 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles River Wye/Afon 21km 3260 Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion Gwy (Wales) SAC vegetation 7140 Transition mires and quaking bogs 1092 White-clawed (or Atlantic stream) crayfish 1095 Sea lamprey 1096 Brook lamprey 1099 River lamprey 1103 Twaite shad 1106 Atlantic salmon 1163 Bullhead

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 37 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features 1355 Otter 1102 Allis shad Migneint - Arenig - 22.4km A082 Hen Harrier (breeding) Dduallt SPA A098 Merlin (breeding) A103 Peregrine (breeding) Migneint - Arenig - 22.4km 4030 European dry heaths Dduallt SAC 7130 Blanket bogs 3130 Oligotrophic to mesotrophic standing waters with vegetation 3160 Natural dystrophic lakes and ponds 4010 Northern Atlantic wet heaths with Erica tetralix 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles Rhinog SAC 23.8km 4030 European dry heaths 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles 3130 Oligotrophic to mesotrophic standing waters with vegetation 4010 Northern Atlantic wet heaths with Erica tetralix 4060 Alpine and Boreal Heaths 7130 Blanket bogs 7150 Depressions on peat substrates of the Rhynchosporion 1831 Floating water-plantain Ellenydd SAC 24.8km 6130 Calaminarian grasslands of the Violetalioa calaminariae 7130 Blanket bogs

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 38 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features 3130 Oligotrophic to mesotrophic standing waters with vegetation 4030 European dry heaths 1831 Floating water-plantain Morfa Harlech a 25.9km 2110 Embryonic shifting dunes Morfa Dyffryn SAC 2120 Shifting dunes along the shoreline with Ammophilla arenaria (white dunes) 2170 Dunes with Salix repens ssp. argentea (Salicion arenariae) 2190 Humid dune slacks 1395 Petalwort Grogwynion SAC 29.1km 6130 Calaminarian grasslands of the Violetalioa calaminariae 4030 European dry heaths

5.1.3 The Conservation Objectives for these sites were reviewed from the Core Management Plans available on the Natural Resources Wales website. Objectives for features being considered within the assessment are provided in Section 8 below.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 39 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

6 Identification of In-Combination Projects

6.1.1 Following consultation with the Snowdonia National Park Authority and Powys County Council and searches of their planning websites, (including that of Ceredigion Council) no major developments were identified within the following categories:  development under construction;  application(s) permitted but which are not yet implemented; and  submitted applications not yet determined, and which, if permitted, would affect relevant features of European Designated Sites considered within this document. 6.1.2 Further to this there are no potential in-combination developments identified in the adopted development plans:  The Powys Unitary Development Plan 2001-2016,adopted by Powys County Council on March 1st 2010;  The Eryri Local Development Plan 2007-2022, adopted by the Snowdonia National Park Authority on July 13th 2011;  The Ceredigion Location Development Plan 2007-2022, adopted by Ceredigion County Council on April 25th 2013. 6.1.3 NRW’s forest management plans could be a source of sediment to the Afon Dyfi. The Habitats Regulations Assessment undertaken for the Dyfi Forest Resource Plan concluded that although there was the potential for effects on the Pen Llŷn a’r Sarnau SAC and Dyfi Estuary SPA, these would not be significant. The effects considered regard potential changes in water quality in particular acidification in relation to the Afon Dulas North failing under the Water Framework Directive for pH levels.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 40 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

7 Consultation

7.1.1 Since commencement of detailed development of the Scheme for the purposes of EIA/SIAA and environmental surveys in 2015/16, liaison meetings have been held with Natural Resources Wales, with other meetings to discuss particular aspects of the Scheme as required. 7.1.2 This SIAA report has also been submitted to NRW and Local Planning Authorities (Powys and Snowdonia National Park Authority) for consultation as part of the overall public consultation on the Environmental Statement.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 41 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

8 Consideration of the Significance of Potential Effects – Screening Stage

8.1.1 The following section and tables set out the Test of Likely Significance of Effects occurring as a result of the implementation of The Scheme. This has been undertaken in a series of steps documented in the tables below. 8.1.2 The first step has been to consider if there are pathways that would link the potential impacts of The Scheme to the features of the European Sites and therefore whether Sites could be excluded from consideration if no pathways are present.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 42 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Table 5 Consideration of European Sites which are linked to The Scheme

Site Distance Qualifying Features Pathways Comments Pen Llyn a'r 4.3km 1110 Sandbanks which No pathway Sufficient separation distance based on maps within Sarnau/Lleyn Peninsula are slightly covered by for effect the Regulation 33 Package (CCW, 2009)2 and the Sarnau SAC seawater all the time 1130 Estuaries Potential for Situated downstream of proposed new crossing of effects as the Afon Dyfi identified in Section 4.4 above 1150 Coastal lagoons No pathway Sufficient separation distance based on maps within for effect the Regulation 33 Package (CCW, 2009) 1160 Large shallow inlets and bays 1170 Reefs 1140 Mudflats and Potential for Situated downstream of proposed new crossing of sandflats not covered by effects as the Afon Dyfi seawater at low tide identified in Section 4.4 above

2 The Regulation 33 Package is a document published by CCW (now NRW) documenting the features of Marine SACs, their conservation objectives and management actions.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 43 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 1310 Salicornia and other Potential for Situated downstream of proposed new crossing of annuals colonizing mud effects as the Afon Dyfi and sand identified in Section 4.4 above 1330 Atlantic salt Potential for Situated downstream of proposed new crossing of meadows (Glauco- effects as the Afon Dyfi Puccinellietalia maritimae) identified in Section 4.4 above 8330 Submerged or No pathway Sufficient separation distance partially submerged sea for effect caves 1349 Bottlenose dolphin Potential for Dolphins normally feed over the Sarnau reefs and effects as off the mouths of estuaries identified in Section 4.4 above 1355 Otter Potential for Otters sighted between Pont-ar-Ddyfi and effects as Millennium Bridge during surveys. An active holt identified in has been identified 400m upstream of the proposed Section 4.4 crossing. Other features with potential to be used by above otters have also been located downstream of the proposed crossing.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 44 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 1364 Grey seal Potential for Although the seal population is largely centred effects as around the north Wales coast and Bardsey Island identified in they are a wide ranging species and may forage Section 4.4 throughout the SAC boundary. above Dyfi Estuary / Aber Dyfi 5km A395 Greenland white- Potential for Potential for disturbance if using areas near the SPA fronted goose (wintering) effects as proposed scheme identified in Section 4.4 above Cors Fochno and Dyfi 6km 7110 Active raised bogs No pathway Although the estuary is included within the Ramsar for effects designation, the features of the site are limited to bog habitats within Cors Fochno (CCW, 2011). 7120 Degraded raised No pathway bogs still capable of for effects natural regeneration 7150 Depressions on peat No pathway substrates of the for effects Rhynchosporion Cadair Idris SAC 6.6km 3130 Oligotrophic to No pathway Sufficient separation distance mesotrophic standing for effect waters with vegetation 8110 Siliceous scree of the montane to snow levels

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 45 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 8210 Calcareous rocky slopes with chasmophytic vegetation 8220 Siliceous rocky slopes with chasmophytic vegetation 4010 Northern Atlantic wet heaths with Erica tetralix 4030 European dry heaths 6410 Molinia meadows on calcareous, peaty or clayey-silt-laden soils 6430 Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels 7130 Blanket bogs 7230 Alkaline fens 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 46 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 1065 Marsh fritillary butterfly 1393 Slender green feather-moss Coed Cwm Einion SAC 8.3km 9180 Tilio-Acerion forests No pathway Sufficient separation distance of slopes, screes and for effect ravines Craig yr Aderyn SPA 10.9km A346 Chough (summer No potential Birds have been known to move up to 8km between and winter) for interaction roost sites (CCW, 2008a). Coedydd Derw a 13.2km 91A0 Old Sessile oak No pathway Sufficient separation distance Safleoedd Ystlumod woods with Ilex and for effect Meirion / Meirionydd Blechnum in the British Oakwoods and Bat Sites Isles SAC 91E0 Alluvial forests with No pathway Sufficient separation distance Alnus glutinosa and for effect Fraxinus excelsior (Alno- Padion, Alno incanae, Salicion albae) 3260 Water courses of No pathway Sufficient separation distance and different plain to montane levels for effect catchments with the Ranunculion fluitantis and Callitricho- Batrachion vegetation

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 47 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 4010 Northern Atlantic wet No pathway Sufficient separation distance heaths with Erica tetralix for effect 4030 European dry heaths No pathway Sufficient separation distance for effect 9180 Tilio-Acerion forests No pathway Sufficient separation distance of slopes, screes and for effect ravines 91D0 Bog woodland No pathway Sufficient separation distance for effect 1303 Lesser horseshoe Potential for Taking a precautionary approach, lesser horseshoe bat effects as bats within the area of the Scheme could interact identified in with the population within the SAC through a Section 4.4 network of roosts present between the Scheme and above to the north. Cors Fochno SAC 13.8km 7110 Active raised bogs No pathway The mire habitats within Cors Fochno are for effect predominantly rainwater fed (CCW, 2011). 7120 Degraded raised bogs still capable of natural regeneration 7150 Depressions on peat substrates of the Rhynchosporion

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 48 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments West Wales 15.8km No pathway Porpoise are unlikely to enter the river channel or Marine/Gorllewin Cymru for effect migrate up stream to shallow water present in the Forol cSAC 1351 Harbour porpoise vicinity of the existing Pont-ar-Ddyfi. Northern Cardigan Bay 16.5km No pathway This site is designated for wintering use. Divers /Gogledd Bae Ceredigion for effect moult during the first half of the winter and are SPA flightless. They are therefore unlikely to come A001 Red throated diver inland. Afon Eden - Cors Goch 17.2km 7110 Active raised bogs No pathway Different catchments and separation distance. The Trawsfynydd SAC for effect Afon Eden is a tributary on the northern side of the 1029 Freshwater pearl Afon Mawddach situated between Llyn Trawsfynydd mussel and . While otters are known to move 1831 Floating water- between catchment areas depending on the plantain territories, the separation distance is considered sufficient that it is very unlikely for otters present on 1106 Atlantic salmon the Afon Dyfi to be the same animals using the Afon 1355 Otter Eden. Berwyn SPA 18.7km A082 Hen Harrier No potential Studies have shown that males tend to range up to (breeding) for interaction 9km from nest sites with females having smaller ranges (Arroyo, Leckie, Amar, McCluskie, & Redpath, 2014) A098 Merlin (breeding) No potential Studies have shown maximum foraging ranges from for interaction the nest of 4km (Rebecca, Cosnette, Duncan, Picozzi, & Catt, 1990)

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 49 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments A103 Peregrine (breeding) No potential Core foraging distance of 2km during breeding for interaction season with maximum recorded distance of 18km (SNH, 2013)

A074 Red kite (breeding) No potential Core range of 4km, with maximum range of up to for interaction 6km (SNH, 2013) Berwyn a Mynyddoedd 18.7km 4030 European dry heaths No pathway Sufficient separation distance de Clwyd / Berwyn and for effect 7130 Blanket bogs South Clwyd Mountains SAC 6210 Semi-natural dry grasslands and scrubland facies on calcareous substrates 7140 Transition mires and quaking bogs 8120 Calcareous and calcshist screes of the montane to alpine levels 8210 Calcareous rocky slopes with chasmophytic vegetation Coedydd Llawr-y-glyn 19.8km 91A0 Old Sessile oak No pathway Sufficient separation distance SAC woods with Ilex and for effect

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 50 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments Blechnum in the British Isles Ellenydd - Mallaen SPA 20km A098 Merlin (breeding) No potential Studies have shown maximum foraging ranges from for interaction the nest of 4km (Rebecca, Cosnette, Duncan, Picozzi, & Catt, 1990) A074 Red kite (breeding) No potential Core range of 4km, with maximum range of up to for interaction 6km (SNH, 2013) Coedydd a Cheunant 20.5km 91A0 Old Sessile oak No pathway Sufficient separation distance Rheidol/Rheidol Woods woods with Ilex and for effect and Gorge SAC Blechnum in the British Isles River Wye/Afon Gwy 21km 3260 Water courses of No pathway Sufficient separation distance and different (Wales) SAC plain to montane levels for effect/No catchments. Whilst otter are known to move with the Ranunculion potential for between catchments during dispersal of young and fluitantis and Callitricho- interaction depending on territorial areas, the separation Batrachion vegetation between the Afon Dyfi within the Study Area and the headwaters of the Afon Gwy mean it is 7140 Transition mires and considered very unlikely that otters present within quaking bogs the Study Area are associated with the population 1092 White-clawed (or of otters within this SAC. Atlantic stream) crayfish 1095 Sea lamprey 1096 Brook lamprey

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 51 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 1099 River lamprey

1103 Twaite shad

1106 Atlantic salmon 1163 Bullhead 1355 Otter

1102 Allis shad

Migneint - Arenig - 22.4km A082 Hen Harrier No potential Studies have shown that males tend to range up to Dduallt SPA (breeding) for interaction 9km from nest sites with females having smaller ranges (Arroyo, Leckie, Amar, McCluskie, & Redpath, 2014) A098 Merlin (breeding) No potential Studies have shown maximum foraging ranges from for interaction the nest of 4km (Rebecca, Cosnette, Duncan, Picozzi, & Catt, 1990) A103 Peregrine (breeding) No potential Core foraging distance of 2km during breeding for interaction season with maximum recorded distance of 18km (SNH, 2013)

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 52 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments Migneint - Arenig - 22.4km 4030 European dry heaths No pathway Sufficient separation distance Dduallt SAC for effect 7130 Blanket bogs

3130 Oligotrophic to mesotrophic standing waters with vegetation

3160 Natural dystrophic lakes and ponds 4010 Northern Atlantic wet heaths with Erica tetralix 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles Rhinog SAC 23.8km 4030 European dry heaths No pathway Sufficient separation distance for effect 91A0 Old Sessile oak woods with Ilex and Blechnum in the British Isles

3130 Oligotrophic to mesotrophic standing waters with vegetation

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 53 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 4010 Northern Atlantic wet heaths with Erica tetralix 4060 Alpine and Boreal Heaths 7130 Blanket bogs 7150 Depressions on peat substrates of the Rhynchosporion 1831 Floating water- plantain Ellenydd SAC 24.8km 6130 Calaminarian No pathway Sufficient separation distance grasslands of the for effect Violetalioa calaminariae

7130 Blanket bogs 3130 Oligotrophic to mesotrophic standing waters with vegetation 4030 European dry heaths 1831 Floating water- plantain Morfa Harlech a Morfa 25.9km 2110 Embryonic shifting No pathway Sufficient separation distance Dyffryn SAC dunes for effect

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 54 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Site Distance Qualifying Features Pathways Comments 2120 Shifting dunes along the shoreline with Ammophilla arenaria (white dunes)

2170 Dunes with Salix repens ssp. argentea (Salicion arenariae) 2190 Humid dune slacks 1395 Petalwort Grogwynion SAC 29.1km 6130 Calaminarian No pathway Sufficient separation distance grasslands of the for effect Violetalioa calaminariae 4030 European dry heaths

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 55 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

8.1.3 The pre-screening exercise set out in Table 3 results in three sites being considered further within the scope of the AIES. These are the Dyfi Estuary / Aber Dyfi SPA, Pen Llyn a’r Sarnau / Pen Lleyn and the Sarnau SAC and Coedydd Derw a Safleoedd Ystlumod Meirion / Meirionydd Oakwoods and Bat Sites SAC, albeit for certain features.

8.2 Test of Likely Significant Effect (TLSE) 8.2.1 The TLSE is made in light of the conservation objectives for each of the sites and features in the following sections. 8.2.2 Consideration of the TSLE has been made in the absence of mitigation measures as described in Section 4 above.

Pen Llyn a’r Sarnau / Lleyn Peninsula and the Sarnau SAC

Estuarine Habitat Features 8.2.3 NRW’s vision for the Pen Llŷn a’r Sarnau SAC taken from the Regulation 33 Package is for:  “a high quality marine and coastal environment which is healthy, productive and biologically diverse, supporting resilient marine ecosystems and communities. The special habitat and species features of the SAC will be maintained and, where necessary, restored so that they will be able to sustain themselves in the long-term as part of naturally functioning ecosystems. The diversity of the wildlife habitats and species in the SAC will not be degraded.” 8.2.4 In relation to the estuaries feature vision is for:  “each of the three estuaries of the SAC will continue to be shallow, bar-built drying estuaries supporting a mosaic of habitats and associated wildlife that reflects the transition from the estuarine to terrestrial habitats. The estuaries will support good quality saltmarsh transitions to other habitats such as shingle, sand dune, peat mire, brackish and freshwater marsh, reed swamp, bog and woodland. The sediments of the estuaries will continue to comprise a high proportion of sandy to muddy sediments, and the sediment type and biological communities associated with them will reflect a gradient from more exposed and saline conditions at the mouth of each estuary to more sheltered freshwater-influenced communities in their landward reaches. The structure and characteristics of each estuary will be determined by unhindered geomorphological and biological processes, including sediment transport, erosion and accretion and the influence of flood events and by appropriate management of the surrounding catchments.”

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 56 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

8.2.5 The Regulation 33 information for the Pen Llyn a’r Sarnau SAC (CCW, 2009) states the following objectives for the habitat features (set out in Table 3 above) of the SAC:  the overall distribution and extent of the habitat features within the site, and each of their main component parts is stable or increasing;  the physical, biological and chemical structure and functions necessary for the long-term maintenance and quality of the habitat are not degraded;  the presence, abundance, condition and diversity of typical species are such that habitat quality is not degraded. 8.2.6 In the absence of mitigation there is the potential for pollution and sediment laden run-off from construction areas to enter the Afon Dyfi and be transported to the SAC located downstream. Although there would be dilution of any pollutants within the river system and larger estuary, there is still the potential for significant effects to occur on habitat features.

Marine Mammal Species Features 8.2.7 The vision for the SAC is that it “will continue to provide a productive and supportive marine area for grey seals. The population of grey seals frequenting the SAC will form and important component of a larger southwest UK population of grey seals. Grey seals will continue to be widespread throughout the SAC predominantly in areas of open coast and sea.” 8.2.8 And that it “will continue to provide a productive and supportive marine area for bottlenose dolphin. Bottlenose dolphin will continue to be widespread within the waters of the SAC and those frequenting the SAC will reflect a healthy population structure including immature and adult male and female dolphins.” 8.2.9 The species features will be considered to be in favourable condition if:  The population is maintaining itself on a long-term basis as a viable component of its natural habitat;  The species population within the site is such that the natural range of the population is not being reduced or likely to be reduced for the foreseeable future;  The presence, abundance, condition and diversity of habitats and species required to support these species is such that the distribution, abundance and population

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 57 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

dynamics of the species within the site and population beyond the site are stable or increasing. 8.2.10 Dolphins are very unlikely to move beyond the tidal limits of the Dyfi Estuary which is located approximately 3.7km downstream of the existing Pont-ar-Ddyfi. There have been no records or dolphins reported to the local records centres. There are several sections on the non-tidal river between the estuary and the Scheme which are shallow and are unlikely to allow dolphin to moving further upstream. 8.2.11 There are no records of seals in the search area used for the desk study, but some anecdotal records for seals in the vicinity of the bridge but none could be found within datasets available. It is therefore considered that seals do not make regular use of the Afon Dyfi in the vicinity of the Scheme due to the absence of reported records. 8.2.12 The potential disturbance of a seal within the river during any construction activities, is not considered to have a discernible effect on the population of seals either within the SAC or the wider Cardigan Bay area as the effect would be on a small number of animals if they were present. It is therefore considered that the Scheme will not give rise to a significant effect on the marine species features of the Pen Llyn a’r Sarnau SAC.

Otter 8.2.13 The conservation objectives stated for grey seal and bottlenose dolphin also apply to otter. 8.2.14 Although not within the SAC, the otters present on the Afon Dyfi, observed during surveys along with two probable resting places within the study area, are likely to contribute to the SAC otter population as the range of the animals present could extend down to the tidal estuary which is located within the SAC boundary. 8.2.15 The construction of the Scheme is likely to result in the temporary disturbance of any otter using the area of overhanging tree roots immediately downstream of the existing retaining wall to the west of the proposed river crossing (approximately 60m from the proposed crossing). While otters have not been recorded using this feature, it has the potential to be used in the future and is therefore considered within this assessment. The holt located upstream of the proposed crossing will not be subject to disturbance from the construction activities. 8.2.16 The disturbance of otters on the Afon Dyfi in the vicinity of the Scheme from construction activities, may temporarily affect the

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 58 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

localised distribution and movement of otters within that stretch of the river. 8.2.17 The construction of the Scheme therefore has the potential to give rise to significant effects on the otter population within the SAC. 8.2.18 No operational effects on otter have been identified as there will be a large area of floodplain available for otters moving along the river corridor during high flow conditions. Furthermore during flood events when the river bursts its banks otters will be able to use the livestock underpass in front of the north abutment to safely pass beneath the Scheme. The design of the Scheme means that it is highly unlikely that otters will cross the highway. 8.2.19 It is therefore considered that although there will be temporary localised effects on otters during construction, the measures included within the Scheme and the large size of the SAC and otter population mean that the Scheme is not considered likely to give rise to significant effects on the otter feature of the SAC.

Dyfi Estuary / Aber Dyfi SPA

Conservation Objectives and Current Conservation Status: White-Fronted Goose 8.2.20 The Core Management Plan for the Dyfi Estuary states that the site would be considered to be in a favourable conservation status, where all of the following conditions are satisfied:  The Dyfi wintering population attains national importance level (i.e.1% of the national (UK) population), annually;  Winter mortality levels are <1% annually;  Juvenile / sub-adult birds comprise > 5% of the wintering population annually;  All site-specific factors affecting the achievement of these conditions (e.g. avoidable disturbance), are under control. 8.2.21 Indicators for the feature include:  Population size (lower limit 209 geese equivalent to 1% of the UK population level);  Winter survival/mortality rate (lower limit 98% winter survival rate);  Proportion of juvenile geese to adults (lower limit of 5% of the flock being juvenile or sub-adult birds).

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 59 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

8.2.22 The white-fronted goose population within the SPA is currently considered to be in unfavourable condition and is declining mainly as a result of population pressures outside the UK.

Consideration 8.2.23 No white-fronted geese have been recorded using the areas of the flood plain within the vicinity of the proposed construction activities during the surveys conducted between October 2015 and March 2016. No records of white-fronted geese were present within the dataset provided by Cofnod in response to data searches. 8.2.24 As geese are not using the areas surrounding the Scheme, there is no risk or potential for disturbance effects, and the Scheme is not considered likely to have a significant effect on this feature in term of disturbance. 8.2.25 However the support habitats within the estuary may be affected by changes in water quality as described for the habitat features of the SAC described above. 8.2.26 It is therefore considered that The Scheme on its own, will give rise to significant effects on the Dyfi Estuary SPA in terms of water quality effects on supporting habitats.

Coedydd Derw a Safleoedd Ystlumod Meirion / Meirionydd Oakwoods and Bat Sites SAC

Conservation Objectives and Current Conservation Status: Lesser Horseshoe Bat 8.2.27 The Core Management Plan for the Meirionydd Oakwoods and Bat Sites SAC (CCW, 2008b) states that the lesser horseshoe bat population of the site would be considered to be in a favourable conservation status, where all of the following conditions are satisfied:  The population of lesser horseshoe bats should be maintained at its current size and encouraged where possible to increase;  There are sufficient breeding roosts (buildings, structures and trees) and hibernation roosts (mines and buildings) of appropriate quality;  Foraging or feeding habitat in the SAC and surrounding countryside, including grasslands and some gardens, is of appropriate quality, extent and connectivity across the range;

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 60 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 The range of the population within the SAC/Gwynedd is stable or increasing;  All factors affecting the achievement of these conditions are under control. 8.2.28 Indicators for the feature include:  Population size (expected to be within the normal range for the roosts counted and in line with current trends);  Roost sites (should be maintained and where possible enhanced, free from disturbance, with well-connected flight lines. Roads should have closed canopy crossings without street lighting);  Foraging habitat (no loss of habitat or decline in its quality)  Range (known roost sites within the SAC should be continue to be used). 8.2.29 The lesser horseshoe bat population within the SAC is currently considered to be in favourable condition.

Consideration 8.2.30 Although lesser horseshoe bats are a mobile species, the core range around maternity sites is 4 - 5km, with movement of up to 11km between summer and winter roosts (Catherine Bickmore Associates, 2003). It is therefore likely that the lesser horseshoe bats recorded during the surveys were associated with the maternity roosts present at Plas Llwyn-Gwern to the north of the Scheme. However a network of roosts exists to the north and there is therefore the potential for bats from this colony to interact with and support bats within the SAC designated population. 8.2.31 Construction will lead to removal of vegetation within the construction footprint, most notably hedgerows and trees on the northern bank of the Afon Dyfi, which are used by lesser horseshoe bats as flight routes. 8.2.32 In the absence of mitigation it cannot be concluded with certainty that the bats present are not linked to the SAC population and that the severing of flight routes by the Scheme would not be a significant effect. Therefore taking a precautionary approach this site has been included within the Appropriate Assessment set out below.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 61 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

9 In-Combination Assessment

9.1.1 As stated above in Section 5, with the exception of NRW’s forest management plans, there are no other projects within the vicinity of the Scheme which could potentially give rise to in combination effects. Those projects which have been identified, comprising proposed residential development within Machynlleth, have been considered and there are no discernible pathways to give rise to in-combination effects. 9.1.2 It has been identified that NRW’s forest management plans could be a source of sediment to the Afon Dyfi when felling operations give rise to areas of bare ground at risk of erosion. However, the principle effect highlighted in relation to the forest management plans was that of acidification. The construction and operation of the proposed scheme would not give rise to any acidification of the Afon Dyfi and therefore there is no potential for interaction between these plans and the Scheme to give rise to in-combination effects. 9.1.3 In relation to the potential for effects on lesser horseshoe bats, the rotational felling of trees within the NRW forest areas have the potential to affect bat flight lines. Although lesser horseshoes are unlikely to foraging within coniferous woodland, they may use it to move between roost sites and foraging areas. However, it is likely that sufficient fringes of vegetation would be left at the edge of forest coops such that lesser horseshoe bats would still be able to move through the landscape. Therefore, although there is the potential for an in- combination effect between the NRW forest management plans and the Scheme, this is not considered to be significant within the SAC population.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 62 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

10 Appropriate Assessment

10.1 Pen Llyn a’r Sarnau / Lleyn Peninsula and the Sarnau SAC and Dyfi Estuary / Aber Dyfi SPA 10.1.1 The Screening Assessment identified the potential for significant effects on habitat features of the SAC and support habitats within the SPA through the potential risk of changes in water quality. 10.1.2 The conservation objectives for the SAC are set out in Section 8 above. 10.1.3 In particular the Regulation 37 information includes the following requirements in relation to pollution:  “contaminant levels in the water column and sediments derived from human activity to be:  At or below existing statutory guideline concentrations;  Below levels that would potentially result in increase in contaminant concentrations within sediments or biota;  Below levels potentially detrimental to the long-term maintenance of the feature species populations, their abundance or range taking in to account bioaccumulation and biomagnification.”

Assessment of Effects 10.1.4 The water quality assessment for the Scheme (documented in Chapter 15 of the Environmental Statement) identifies the risk of pollution and sediment run-off during the construction, in particular construction activities in close proximity to the river corridor. However it is difficult to quantify either the risk of pollution/sediment releases or the quantity which might be released. 10.1.5 The risk is heighted due to the location of the construction works within the floodplain of the river and the potential for a flood event to result in the release of sediments and pollutants if it were to occur during higher activities such as pilling or pouring of concrete. 10.1.6 During the operation of the Scheme the levels of dissolved metals within any surface water being discharged have been modelled as being below limits of detection (as shown by HAWRAT modelling results provided in Table 15.12 of the Environmental Statement).

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 63 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

10.1.7 A long-term impact assessment of surface water runoff from the highway into the Afon Dyfi has been undertaken by comparing the annual average concentrations of copper and zinc predicted in the HAWRAT results with the EQSs stated in the WFD (standards and classifications) Directions 2015. The predicted concentrations are under the EQS thresholds for watercourses. 10.1.8 On all roads there is a risk that an accidental spillage or vehicle fire may lead to an acute pollution incident. It is generally accepted that the risk on any road is proportionate to the risk of an HGV road traffic accident. Because new or improved roads are designed to reduce the accident rate, they should be associated with fewer acute pollution effects. Where a spillage does reach a surface watercourse the pollution effect can be severe but is usually of short duration. 10.1.9 The acceptable risk of a pollution incident is stated in HD 45/09 to be a risk with an annual probability of less than 1%, or a return period of 1 in 100 years, of discharges reaching a sensitive watercourse or groundwater. 10.1.10 Using the HD 45/09 assessment method, the risk of spillages has been calculated for both the current and proposed situations. The risks of accidental spillages, as corroborated by the analysis presented in the Environmental Statement, are very low and well within the acceptable limits (i.e. 1%). Based on the spillage assessment, the magnitude of potential impact on the Afon Dyfi is considered to be negligible. 10.1.11 However, given the risk of spillages both during construction and operation, a precautionary approach has been taken to include mitigation measures to provide greater certainty over the potential for contaminants to be present within the water column in the designated areas.

Mitigation measures 10.1.12 The risk of pollution entering the Afon Dyfi from the construction works is prevented in line with good construction practice, as a detailed Construction Environmental Management Plan will be produced in line with the pre-CEMP (included within the Environmental Statement for the Scheme) and agreed with relevant stakeholders prior to construction. This includes the following plainly established and uncontroversial measures which are considered as part of the Scheme and Construction design:  Strict adherence to Pollution Prevention Guidelines and CIRIA best practice;  Silt protection measures around all excavations;

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 64 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

 All plant will be sourced from a trusted reputable company and will come with spill kits which site personnel will be trained to use;  All storage containers would remain within the site compound outside of the floodplain, and be appropriately bunded to prevent any spillages or leaks.  No storage of materials or refuelling operations will be permitted outside the site compound.  Early warning system to alert work force to rising river levels, along with monitoring of weather forecasts to predict potential flood events and initiate measures to reduce risks of sediment release. 10.1.13 The CEMP will be reviewed and updated and submitted to NRW for agreement prior to the commencement of construction activities. 10.1.14 In addition to these measures during the construction phase the drainage design for the Scheme includes isolation devices on all pipe outfalls and petrol interceptors for the two drainage catchments that outfall directly to the Afon Dyfi.

Residual Assessment 10.1.15 With the inclusion of the mitigation measures above it is concluded that the proposed Scheme is unlikely to give rise to an adverse effect on the integrity of the habitat features of the SAC/SPA.

10.2 Coedydd Derw a Safleodd Ystlumod Meiroin / Meirionydd Oakwoods and Bat Sites SAC

Assessment of Effects 10.2.1 The performance indicators for the lesser horseshoe bat feature require no loss of foraging habitat or decline in its quality. The Core Management Plan also includes specific indicators for roads and development due to the potential increase in mortality through collision with vehicles and the severing of flight lines. The operational limits provided are as follows:  “Maintain closed canopy crossings over roads with connectivity to hedges and tree lines to foraging sites and roosts. Lighting should be avoided.” 10.2.2 In the absence of mitigation the proposed Scheme will result in the severance of flight lines in the form of the northern bank of the Afon Dyfi and the hedgerows within the floodplain. Assuming that the lesser horseshoe bats present within the

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 65 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

study area are intrinsically linked to the SAC population the proposed Scheme could be seen as causing this European Site to fail to meet the performance indicators which have been set.

Mitigation Measures 10.2.3 The following mitigation principles and measures will be included within the scheme during the Construction Phase through detailed design and the adherence to a Construction Environmental Management Plan (CEMP):  Restrictions on working hours in the proximity Afon Dyfi and northern extent of the scheme to avoid night working and task lighting;  Re-connection of severed hedgerows with field boundaries (with gates for the access track) beneath the viaduct to maintain bat flight routes;  During construction measures will be put in place to maintain bat flight lines along the northern river bank during the summer months (April to October). These will comprise cut branches mounted in containers which can be moved during the day to allow construction activities to take place. 10.2.4 The design of the Scheme, comprising a significant length of viaduct, is such that it is not possible to maintain closed canopies over the Scheme. However, bat flight lines can be retained beneath the Scheme as set out above. The agricultural underpass at the northern abutment will also be a viable flight route for bats to safely pass under the Scheme.

Residual Assessment 10.2.5 However given the distance from the SAC roost sites and the inclusion of the mitigation measures above, it is considered that any effect would not be discernible compared to natural fluctuations in population levels within the SAC designated roosts. Furthermore this impact would not restrict the ability of the SAC to achieve the conservation objectives for the lesser horseshoe bat feature. 10.2.6 It is therefore concluded that the proposed Scheme is unlikely to give rise to an adverse effect on the integrity of the lesser horseshoe bat feature of the SAC.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 66 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

11 Monitoring

11.1 Pre-Construction Monitoring 11.1.1 Monitoring in the form of pre-construction surveys will be undertaken to provide up to date information on the presence of otters and horseshoe bat species. 11.1.2 Otter surveys would be undertaken on two occasions within the preceding six months prior to the start of construction. The Afon Dfyi and Afon Dulas will be searched for signs of otter activity and potential resting places. Other areas of habitats such as woodlands and dense scrub will also be searched for the presence of potential natal holts. 11.1.3 Pre-construction surveys for bats will comprise the following elements:  Inspections and emergence/re-entry surveys of trees within 50m;  Static activity monitoring of the identified flight routes; and  Walked transects along the alignment of the proposed Scheme. 11.1.4 In addition water quality monitoring will also be undertaken to establish baseline conditions within the Afon Dyfi and at the discharge points within the floodplain. The exact monitoring locations and water quality indicators to be monitored will be agreed with NRW in advance of the commencement of construction works on site.

11.2 Monitoring during Construction 11.2.1 During the construction phase monitoring will be undertaken to record animals passing through the construction areas. This will be undertaken using trail cameras to monitor the movement of otters along the Afon Dyfi, and through a combination of static and walked activity transects. Infra-red camera monitoring will also be undertaken at the key flight line locations which have been identified. The full details of monitoring including frequency and monitoring effort will be discussed and agreed with NRW prior to the commencement of construction through the production of an Ecological Compliance Audit Scheme. 11.2.2 During the construction phase the water quality monitoring will continue at regular intervals to ensure that the mitigation measures included are effective at preventing adverse impacts on the water quality within the receiving water courses.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 67 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

11.3 Post Construction Monitoring 11.3.1 Monitoring will be undertaken for three years post-construction, with any requirement beyond this, subject to agreement with the relevant statutory environmental bodies. The monitoring will include:  Bat activity monitoring, using static detectors;  Otter surveys, comprising visual inspections and trail cameras.

11.4 Criteria for Effectiveness 11.4.1 The mitigation measures will be considered to be effective and therefore to have successfully fulfilled their function when the following criteria are met:  90% of lesser horseshoe pass beneath the scheme safely:  This would be where 90% of bats fly under the viaduct instead of flying over the road.  Lesser horseshoe bats continue to be recorded during activity surveys to both the east and west of the scheme;  Otters are recorded passing beneath the viaduct;  No otter casualties are recorded on the scheme;  Water quality indicators remain within acceptable limits agreed with NRW. 11.4.2 If these criteria are not met within any of the monitoring years post construction the mitigation will be reviewed in consultation with NRW to agree any remedial action or alterations to the mitigation to improve its effectiveness.

11.5 Reporting 11.5.1 The results of the monitoring will be reported to NRW and other relevant statutory environmental bodies on an annual basis through the Ecological Compliance Audit and Monitoring Reports. In addition, the scope of the monitoring, methods and results will be discussed through further engagement with the Environmental Liaison Group during and post construction.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 68 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

12 Conclusions

12.1.1 The proposed Scheme has the potential to give rise to significant effects on the Dyfi Estuary SPA and the Pen Llyn a’r Sarnau SAC in terms of localised sediment run-off and disturbance to otters. 12.1.2 The proposed Scheme also has the potential to give rise to significant effects on the Meirionydd Oakwoods and Bat Sites SAC through the fragmentation of habitat caused by severing flight lines. 12.1.3 With the exception of the NRW forest management plans, no additional plans or projects were identified with the potential to incur in-combination effects with the Scheme. Considering effects of the Scheme in-combination with the forest management plans, the assessment predicts the potential for significant effect in terms of water quality. 12.1.4 NRW’s forest management operations could also affect the flight lines of lesser horseshoe bats, however due to the poor quality of coniferous woodland as foraging habitat for bats and the presence of other vegetation corridors it is considered that any in-combination effect between the Scheme and forest management on lesser horseshoe bats would not be significant. 12.1.5 A range of mitigation measures have been identified (in Section 10) and included within the Scheme including petrol interceptors and isolation mechanisms, and the reconnecting of linear corridors beneath the viaduct. 12.1.6 These measures are considered sufficient to mitigate the effects of the proposed scheme such that they would not constitute an adverse effect on the integrity of the European Sites concerned. 12.1.7 DMRB HD44/09 guidance (Highways Agency, 2009) recommends that, for the purposes of Regulation 61 of the Conservation of Habitats and Species Regulations 2010, answers to the following questions should be provided (based on the information presented) when concluding a SIAA. These are addressed in turn here: (a) Is the proposal directly connected with or necessary to site management for nature conservation? 12.1.8 The Scheme is neither connected with nor necessary to site management for any of the European sites considered within this document.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 69 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

(b) Is the proposal likely to have a significant effect on the features of the site of European Importance, alone or in combination with other plans and projects? 12.1.9 The Screening Stage concluded that there is the potential for effects on lesser horseshoe bats, otters and estuarine habitats which have the potential to be significant. 12.1.10 The potential for effects from water quality emissions during both construction and operation has also been identified. c) What are the implications of the effects of the proposal on the sites’ conservation objectives and will it delay or interrupt progress towards achieving the objectives? 12.1.11 It has been concluded that, assuming the implementation of the various mitigation measures outlined in Section 10 of this document, the proposed Scheme would not affect progress towards the achievement of any of the objectives for qualifying features of European Sites. d) Can it be ascertained that the proposal will not adversely affect the integrity of the sites beyond reasonable scientific doubt? 12.1.12 Whether the Scheme would have an adverse effect on the integrity of the sites has been determined by assessing whether, following the implementation of the mitigation measures outlined in this report, the Scheme would affect the achievement of one or more conservation objectives set for the European Sites considered in the Appropriate Assessment. The assessment concluded that the residual effects of the Scheme would not affect the achievement of any of the conservation objectives set for European Sites considered.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019 Page 70 C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

References

Llywodraeth Cymru / Welsh Government A487 New Dyfi Bridge Statement to Inform an Appropriate Assessment under the Conservation of Habitats and Species Regulations 2017

Works Cited Arroyo, B., Leckie, F., Amar, A., McCluskie, A., & Redpath, S. (2014). Ranging behaviour of hen harriers breeding in Special Protection Areas in Scotland. Bird Study, 1, 48-55. Catherine Bickmore Associates. (2003). Review of Work Carried out on the Trunk Road Network in Wales for Bats. Cardiff: Welsh Government & Countryside Council for Wales. CCW. (2008). Core Management Plan including Conservation Objectives for Craig yr Aderyn (Bird's Rock) SPA. Bangor: Countryside Council for Wales. CCW. (2009). Pen Llyn a'r Sarnau / Lleyn Peninsula and the Sarnau European Marine Site. Bangor: Countryside Council for Wales. CCW. (2011). Core Management Plan, Including Conservation Objectives, for Cors Fochno. Bangor: Countryside Council for Wales. HA. (2007). Environmental Assessment Techniques: Part 1 - Air Quality. In Design Manual For Roads and Bridges (Vol. 11). Highways Agency. HA. (2009). HD44/09 Assessment of IMplications (of Highways and/or Road Projects) on European Sites (including Appropriate Assessment) . In Design Manual for Roads and Bridges. Highways Agency. JNCC. (2016, January). UK Protected Species. Retrieved from Joint Nature Conservation Committee: http://jncc.defra.gov.uk/default.aspx?page=4 NRW. (2016, January). Designated Sites. Retrieved from Natural Resources Wales: https://naturalresources.wales/conservation-biodiversity-and- wildlife/find-protected-areas-of-land-and-seas/designated-sites- search/?lang=en Rebecca, G. W., Cosnette, B., Duncan, A., Picozzi, N., & Catt, D. (1990). Hunting distance of breeding merlins in Grampian indicated by ringed wader chicks taken as prey. Scottish Birds, 16, 38-39. SNH. (2013). Assessing Connectivity with Special Protection Areas (SPAs). Edinburgh: Scottish Natural Heritage. Tyldesley, D. (2011). Assessing Projects Under the Habitats Directive: Guidnance for Competent Authorities. Bangor: Countryside Council for Wales. Tyldesley, D. (2012). Draft Guidance for Plan Making Authorities in Wales: The Appraisal of Plans under the Habitats Regulations. Bangor: Countryside Council for Wales. Tyldesley, D., & Chapman, C. (2013). The Habitats Regulations Handbook. DTA Publications. WG. (2009). Planning Policy Wales - Technical Advice Note 5: Nature Conservation and Planning. Cardiff: Welsh Government.

900237-ARP-ZZ-ZZ-RP-YE-00004 | P02.3 | 20 March 2019

C:\PROJECTWISE\ARUP UK\STEVE.HENRY\DMS78054\900237-ARP-ZZ-ZZ-RP-YE-00004.DOCX

Appendix A Scheme Design Drawings

N a n t W e n l a A1 A B C s D E F G H I J K L M N O P 1 0 1 0 0 I I s - s s H s u u e C N e s F s - R

o D Y s -

g Z Q u e b Z

u o - ( d a r in d L U l is u r r a c d r D h î M s y a r - e d A f y F f 1 ) 4 9 3 y P to A b e d u R d e A r y o a e -

8 f F C g ll i C D o

.4 l 7 m B o f A 4 8 7 t 3

2

D 0

D r a n 2 r r 3

i 0

a 2 i . 9 n m î \

8 d g 5 D . n r a in m d i w

P a e n r D

D r h D r a in -

r a y n in - R R D D

u y \

D

in f s r

i y

a

i a

n w

1 h

0 H g .4 e i m n

f H a

e - 4 9 3 s A r MS e e n

i

Proposed A493 T g

r n a

2 E T c

l r Traffic Calming k

i a v

i

c A k

f C C

R o -

n

Bythynnod Pen-y-Bont H

C

D \

Pen-y-Bont Cottages u p u l r I a A s s s u F o e 1 r s 0

\ d C

e o 1

1 g 9 C . d

m i

P o r

p g n B s

t S i

E f t U D ,

a n d B d y y A

D

s

F l

y

F F w F

e

C o N

n U

n 9 7 s

d .4

m t 8

T , 4 L B r

a U A

\ c A

s k

1 t &

n 3 F

B e

A C

P m o 4 B

n 9 Y u

3 6 s d

t c

1 g o y

0 o a l d Pont-ar-Ddyfi r .1 m y D

D d \

y F K

A

f B

Dyfi Bridge 7

U

8 i 4

8 P _ 7 o n P

t U 1 a 4 R y .3 y r A v e B d m o D B r y n _ D y f i E D d - y - c o e d

D W e r & y A

v C n P P f e n n 2 R :

i o a 4

U A , i n t S 0 f 8 A D t .4

y m , a 7 m s t m l / o n e o

C c C o . p u r a . C R A l fo a R n b o iv D l g

e y .

r f S 4

D A i 4 0 L

ADS U I 4 y D B f k O r S c R y

i T r a B n -

T c N A a e C - C R R 4 M 9 e C

C iv i

y 3 T Y l i

r M / 1 c e a r \

l n \

e r k A : P A 0 n

n w

a D C e

f p t + d

7 h o o a r d

.9 0 t D m n v 0 Fferm Y Fridd M r e

1 e B e g

u r f e + y

0 + s

D 1 y n

y d Y Fridd Farm 3 A 1 d

0 + D y H r

r a n 1 e a . 3 u

i f 2 n

0 5 3

P 1 8 T d l

o i 0 r a c 0 r k 1

n .9 4 G e d m 0 0 .

0

P 0 1 2 l a

0 n

o . ADS . . 0 6 0 - n 0 C

0 + 0 G

d o w

1 0 0 0 0 0 0 1

0 0 F y C 0 0 f

0 o 2 d r n

0 + l + + + + n + + + f o id e s 0 d d

+ 0 p

+ t e d 0 M

1 0 9 0 4 5 6 7 , 8 F h e i

A 0 S l l

3 f 0 s 0 0 0 0 0 0 0 0 r

l y î d

0 . 0 d 0 0 0 0 0 0 0 C 0 0 . P o o

0 n 0 F . . .

. . . . s . A n 0 e

0 0 0 0 0 0 0 t 0 4 M t

. , 8 7 S 0 l in 0 0 U

0 0 0 5 0 0 0 0 0

A 1 7 4 -

.7 B 4 4 0 y 1 0 & m - 0 0 0 0 0 0 0 0 1

A f 5

C .8 0 + 0 f f

B r m

d T o

+ 0 id 0 u

y n

+ r d

0 n

2 2 p

0

. ik 0 D

0 2 T e C u 0 C 0 . B

0 3 o l D

2 t a

r t a

0 s

7 a H g

. i

0 a 3 e S . n

m u

0 0 l f h S r in 2 h y

0 in A 487 n g

g l

+ l e e 0 1 5 .8 m M P a o P c n d o h n t y n l C M l e B il e t h 0 n + iw M ADS 1 m il l e P M n o 0 a n n d 0 c iu D h m r 6 . 0 y a in 0 n l B 0 G l r I

a e id s S s r t h g u

d e h e

e i s

Track n n

g

C C

l

G P o

e e n a r o n

t r a d C

e g R o

R e e n

u c P s

in 0 D Y F y c o t

I E n , C

+ O P A R l in d

K g A

0 s

C

P l

A C

0 DyfiR C Eco Park e y n R E C 2

O D t 8 0 Y C

O F r 7 I e P o . S l d o m

. 0 t n n

a d s

0 t t 0

M io ,

P 0 n P D r U

S 7 + D a a

P 5 y r A in

c

.2 2 f s

S 5 3 i E &

P 9 c Flood Bund

o C

0

B

. d

P 6 D Millennium Footbridge y S 8

a t L y h 6 S M M f 7 ( F a s t u N B f D m e w R r 7 r D ) l M h e S B y a y in o d r S n f a c h i f d C s y l M n h n e h S r a m b P 7 5 a ll a o a i in t n C r n t ti a m b i D g r a n R l e Railway Bridge i a w SaP y S i y l u M l W f r in a d S c r y T i h u t a B r y b n / e in t d e io l l D s s n e t o a a D h l o B D v l v u e S u e D s L p P e u y e B o Busp Depot y D B o t D R a t a n k V n r T e 3 e il w a o 4 r a f v .7 r y i m a l l e A Railway Terrace c e y R O l d W

P o T e

H o l ic e r l

a

5 u s l

c H e

1

E k

O

L

F

Y

C f D a 1 o

S B p O D e L r e e l r F a

W w lL n

o a t h l d F i 8 3

g o O r e e 3 d k s R D s d D D o G D a S M v u / l a P Y r M D e n g y Y y S o e y -

l l N 2 r n f

t Y f V a o 3 y S e D f y P a c G e D r l h 2 y l e d l e a n H G n

d 4 y n

y R

1 d 5 D d I F y G M F P f I

T r 7 i S V M i H 4 S 7 il o a o u f . 5 V n f 3

3 5 l i C

2 ie e t C t 11 s

a 5 o a 3 w S h y c hP a P e t 6 u l l er t h n t s C D G A l e o

H l y a s

G 2 w 1

o n s 9 4 n

a d 2 n t w 1

s e a s T

G e r n o o v l l t r a f t , A f c r k L A y e P s W T n o C B 8 ( v 7 4 1 e B r y d n 2 n e e l y l l g it h is d D a in u l R 2

t 6 s C C e 9 p 5 e e o

o d ) n

t 4 s

1

8 19

17 B 0

T 5 t 1 0 u 2

E S 3 , 2

3 E 4 i u 2 R 0 l d b U S h T e A in g S P r S l e Y H ' s t & D r MACHYNLLETH L O a 5 E l H Y

1 I 3 c e a C

F 2 2 h n

8 d C

K r 1 9 4 B C y d o 1 I d R e y A b B 2 1 d a 5 S

t 4 2 A

t 1 1 a o 6 ir 7 4 0 l t G 1 2 8 2 e A S 7 r W 4 O 2 L

R 2 o n d 2 2 o n d K S T e r r y

0 e r r a

L 2 c e 1 1 9 1 A 6 5 N 1 2 D e E 8 T A 8 7 P 1 N R A p 2 O L L T Legend o S P S T y

t Q L M

L

U T a

A 9 r

l

y

A R a l 1

d P

R E n s 2 E P g w e

y n

O 1 M

1 e l w C n r

F P a c y i

3 5 h P Existing Vegetation Proposed NMU Routes

o a n

r 2 L s u l l e r r f e T t

T A r n

d G y o

7 5 R c C r 2

a a r h r o p l G

r o E a P d

a T l L t R w

1 1 4 4

l 18 l y t g S 1 B k O n d a l t T a c e u d g r A B H E 6 b w T e ADS e Open Grassland Advanced Directional Signs 1

D r M Y N 7 S v T H C e G R U 5

w t a m n 31

m a D l 3 1 6 6 D r a y 3 5 T f A L L in i l 2 5 R A Species Rich Grassland Proposed Culvert & Headwalls C G l o 33 N d t 2 3 E ' M

a n P

1 L A H H n s 2 2 G O 2 E

y o W E a 1 H P d o A 1 7 S f C o d l f r R o A a k S 1 5 G d o s g n s I L R f Highway Fenceline Proposed Drainage 1 e t W A 10 e 1 e o s n 3 S ( s d

1 N c

o e n

1 H 2 P v e r v S H r o a a e D l d ir l t l ) e y Site Extents Existing Culvert & Headwalls 3 2 r f

10 30 50 5 P 6 2 i

o B 1 1 1 2 2 20 40 s 100 Metres a 3 t P 8 Y /

0 t n a l l t P s B n r r W E P u 6 C

A a

s k 4 C a P e C o E R R g

n 4 T e u

1 5 k 5 t Existing NMU Routes R 3 l o 1 Y 1 n b

. E

T c L h o

7 k S 1 r i h 6 E 2 G v m W R y W e e 5 g A N

T g l i 4 ( a e a i 4 6 C G r

A G I e

H r G r u

h o - a w S y p F w

Scale 1:2500 o i 4 8 - A m y r

t 0 n e C G a A M h

t e 1 8 e T a l r g V d

B ) - i

D H

O e 1 9 r il l a s P in

1 y o l

2 D g L - L l 2 l

L O 1 l a T t 7 D

Y A N io 1 G A l e n

N r N

E D o 4 o s E n a R

B i g A .5 g g L L v o V T R © Crown copyright and database rights e l il l O a A B D y Scale at A1 r s to 2015 Ordnance Survey 0100031673. o Client Project Title Drawing Title 1:2500 Notes: D d y f i Role 1. Refer to Figure 8.9 for landscaping planning proposals. A487 New Dyfi Bridge Figure 2.1 Civil - Highways Scheme General Arrangement Suitability 1:2500 S0 - Initial non-contractual P03.7 ------Arup Job No Rev Blythe Gate Blythe Valley Park 244562-00 P03.7 Solihull B90 8AE Name Tel +44 121 213 3000 Fax +44 121 213 3001 www.arup.com Issue Date By Chkd Appd 900237-ARP-ML-ZZ-DR-CH-00101 Do not scale © Arup C o C o n s t , A1 A B C D E F G H I J K L M N A O P s 1 7 l 0 y 2

8 0

4 0

C - A o H d n C N l s - O A R

t 4 M D , 8 7 S- U X X

A - A L

M - 0 0 0 0 & fo n P

2 D + 1 + + + y R 0 C 0

f A 7 4 5 6 i - + 7 2 g B 0 0 0 0 3 d 3 2 0 n 0 0 0 0

i y 0 0 0 0 . . . . 9 - w \ 0 0 0 0 0 g a 0 0 0 0 . n H 0 i r w 0 0 0 0 a 0 C

d r -

0 D

D - o r

R t

R 7 a

D D r

3 i \ . n - m s e y f a X w e h X 0 r g i -

+ , H

L -

2 n r

0 e M o e i

0 - n t i

. g 0 P a 2 n 0 E

u l R 0 M i v n i A i P a C t

- o P c - n n 7

d o h H C o 3 y n \ p

c n 2 u

t r r

0 l A M l e 1 o 0 0

i t \

F 9 l e h e n g d

i iw M r B

m i i l f l e y

D

P M n

o a n w n e

d c N

iu

h 7 m y 8 4 n A

\ B s 0 l t r 3 + G ln e 1 a e id 0 r m t g d u h 0 e c e 0 n o

. D 0 Flood Bund \ 0 C K G P e U

n a o _ t r n P r a d U

e g R R e e A c _ D Y y P W F o P I E C O c n : P Dyfi Eco Park l in d m A R K g o c .

C p P u A R C e r a

n . E C O l D t a Y F r b

O o

I e P l

l d o g S .

t n 4 a d 0 4 I

t S M io n T P 0 P N + D a C 7 0 y r C 5 c M

0 \ \

.2 f : 0 3 5 i E w . 0 c p 0 0 o

S D L y S M M f 7 F a s t N B f R h e h e ffo d d C w M il r m r D t a c h y a b a S B e l n e h S C m r i y y ll ll t ta o n a b a n R r n ti r y i a w M n a y a 5 h il P 7 5 c i a D n M S P to ll y 7 o W M 10 20 50 Metres 8 D f 0 5 4 in S a Y d c A T i h l u t a o r y e b n / Scale 1:1250 in t H e io l l D n e t o h v e y Embankment Viaduct V a 6 l l e y 8 8 m 4 3 25.0 . 25.0 2 1 2 5 . 6 9 + 1

0

v I e V l 0 P E 4 m 8 7 . 5 6 m 5 0 4 . 4 2 5 7 20.0 5 20.0 m

+ 8 1 . v 2 . 0

1 e 3 9 m l 7 1 C 7 3

9 6 . E v 1 4 C 4 0 0 . e + 5 V l 1 . 0 0 1

0

P E 7 4 v 0 7 m I

. 4 e 0 0 8 v 0 V l 3 . + 8 e 1 m 9 0 l P E m . 0 3 0 7 0 . E 1 0 + 1 0 8 3 4 C

0 5

15.0 + 15.0 3 . 0 v R 0 7 . 0 7 + e

C 0 7

V l

0 v 2 C

R P E v . I e V V l e 5 V l P 0 P E P E 0 + 0

I V

10.0 P 10.0

5.0 5.0

8

0.0 - 0.0

Vertical Alignment L=10.400m L=61.068m L=135.373m L=889.296m K=23.000 K=15.000 K=75.000 K=400.000 Ls=48.000m R=255.000m Ls=48.000m Straight L=3.818m L=189.571m Straight L=712.579m Horizontal Alignment R=-255.000m Ls=30.000m Ls=48.000m L=2.891m 1 2 4 4 4 4 4 4 4 4 0 0 0 0 0 0 0 0 3 6 6 3 6 3 6 7 6 6 9 9 8 8 8 8 5 5 4 3 2 1 9 9 7 2 2 2 9 5 1 4 8 4 6 4 8 9 2 0 5 5 1 5 9 3 5 4 9 4 9 8 9 4 1 4 4 6 3 8 8 8 8 6 3 5 3 2 8 6 4 1 4 6 2 2 3 8 6 5 5 1 5 4 4 1 3 4 3 6 ...... 8 8 8 8 8 7 7 7 7 7 8 8 8 8 7 7 7 8 8 8 8 8 7 7 7 7 7 8 8 8 8 8 7 7 8 Existing Level 7 9 1 1 2 2 0 0 0 7 7 7 7 8 8 8 8 8 8 8 8 9 9 9 9 9 8 8 9 9 9 9 9 8 9 9 9 5 3 6 2 1 9 0 7 5 9 8 3 9 1 8 4 9 3 6 8 4 8 1 3 4 4 3 9 8 6 3 9 4 8 2 7 3 9 3 3 9 3 7 0 5 8 9 7 7 8 9 1 2 4 5 6 3 5 8 0 2 4 6 9 2 5 8 0 4 4 6 6 0 ...... 0 1 9 9 2 2 2 7 6 6 1 7 7 8 6 5 5 6 6 6 6 6 4 4 4 5 5 5 5 2 3 3 3 4 0 Proposed Level 8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 8 0 2 4 6 8 0 2 4 8 0 2 4 6 8 0 4 6 8 0 2 4 6 0 2 4 6 8 0 2 Chainage 0 2 4 6 8 6 6 7 5 5 5 5 6 6 6 3 4 4 4 4 4 5 2 2 2 3 3 3 3 1 1 1 1 1 2 2 0 0 0 0 0 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 5 10 Metres

Vertical Scale 1:250 Legend 10 Mainline A487 Profile Existing Ground Level 0 5 10 20 50 Metres Proposed Centreline Horizontal Scale 1:1250

© Crown copyright and database rights to 2015 Ordnance Survey 0100031673. Scale at A1 Notes: Client Project Title Drawing Title 1:1250 Role A487 New Dyfi Bridge Figure 2.2 Civil Engineer - Highways A487 Plan & Profile Suitability S0 - Initial non-contractual P03.6 ------Sheet 1 of 2 Arup Job No Rev Blythe Gate Blythe Valley Park 244562-00 P03.6 Solihull B90 8AE Name Tel +44 121 213 3000 Fax +44 121 213 3001 www.arup.com Issue Date By Chkd Appd 900237-ARP-ML-XX-DR-CH-00201 Do not scale © Arup R C iv A1 A B C y / D E F G H I J K L M N O T a P c e 2 l e n 0 r k 2 A 0

P 0 a - t f D H C N h o o A - 4 u R

n v 9 M D 3 la e - e l u X to e X

Fferm Y Fridd s - A g D y b l y d L

o M y e Y Fridd Farm d - 1 r d D P

y R f o 2 f t 3 A 1 i T - i 8 r a 7 7 c 3 9 k 1

. 2 m 8 4 0 0 A 9 A 1 \ g

4 + n C 9 3 i o 3 1 w a 1 5 F r

C + D 4 f

. - o d

r n o l 3 2 id f 0 6 d R s p 0 D e \ t 0 M s , F h e . y 0 i a A S l l f 0 w s r h g l y î i

d H

d - C r

o e

n e n s i

A g

t 4 M n 2 8 1 , 7 S E A

l U fo + i v

1 i A R n D 2 7 0 4 C v y 4 4

i - e 0 .7 B

1 0 & f 0 0 1 r D i m 0 A H

+ + y + + + C 9 F C fi . \

1 p 7 8 9 0 0 f 0

o B u r

0 0 0 0 0 0 T o 0 r

d A

u

0 0 y 0 0 0 0

n 1 2

c r 0

n \ . . . . . 3 o 0 e 0 0 0 0 p g

7 ik n D 0 0 0 0 0 d T e i r - t

0 0 0 0 0 C u B i A

C

B i n o f

y l R

u t a D

t

a a P H g w s e

t a e S - N

i u

o M h l f 7 8

n S r i

n 4 L h y A ,

n g \

- in A 4 8 7 s t

r l X g

3 e n e

l e e X f m e 1 u - 5 c r D 8 o

. D

m \ t R o K

M U

- _ d C P o a P U r P c H n a d o h R A w - n y _ 0

n W i t P n 0

C : l l B m g 2 M e o c

0 t il h . e p 1 n u r M a .

iw l m i a l b

l o e l M g n . a n 4 0 4 c I iu D S h m r a T y in N n B C C

l M l r Millennium Footbridge \ e \ id :

w t S h g s s p

e a a h

l l i

u u n

g

C D D

l P o

r n e o e n o v

d C f i

A

o R

n

P s

o t

n ,

d

A

s

l

C

y

R

5 C

P o o

n n

d s

0 5 10 20 50 Metres t

, D r

U a

Scale 1:1250 A in

s

&

C

Viaduct Embankment

B d D y y 0 7 8 f m . 8

6 0 6 f 9 4 3 7 2 . r 1 . + 8

y 3 6 m 1 1 0

9 7 m v 5 n T 0 0 8

25.0 . 25.0 e V l + 7 9 8 . 1 2 6 P E

6 .

D 1 1 6

C

+ 1 v

R 1

y e v I V l e V l P E f i P E / D o 20.0 20.0 v e y 7 V a 15.0 15.0 l l e y 10.0 10.0

5.0 5.0 Afon Dyfi 8

0.0 - 0.0 m L=144.734m = 7 4 5 5 6 Vertical Alignment L=889.296m L . % K=400.000 K=36.000 G = 3 . 4 5 4

Straight L=712.579m Horizontal Alignment R=-400.000m R=-172.240m Ls=30.000m L=37.801m Ls=30.000m L=134.765m 1 1 1 2 2 2 2 2 2 4 0 0 0 0 0 0 3 3 6 3 6 7 9 9 9 9 8 8 8 5 5 6 2 2 9 5 9 4 6 7 4 7 8 3 6 8 7 7 7 7 5 2 8 7 1 5 5 1 4 8 7 3 5 4 9 1 6 4 3 0 8 9 7 6 6 7 6 2 1 4 2 2 7 4 9 2 5 8 8 3 0 5 6 ...... 8 6 5 7 9 8 0 7 5 6 8 6 6 6 6 7 8 7 8 9 7 5 8 9 8 0 6 7 7 Existing Level 8 9 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 9 1 2 0 0 7 7 6 6 6 6 6 6 6 7 7 7 6 6 6 6 7 7 7 7 7 8 9 9 8 5 5 5 1 4 1 3 8 2 8 4 9 3 6 8 8 1 3 4 4 3 1 8 6 3 9 4 6 5 4 1 9 9 6 9 8 2 1 6 7 2 2 1 1 0 9 2 3 3 3 3 3 3 9 0 1 1 2 7 4 1 6 7 8 ...... 6 6 0 7 8 6 6 7 7 7 7 7 6 7 7 7 7 7 7 7 6 7 7 7 7 8 9 0 7 6 Proposed Level 6 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 8 0 2 4 6 8 0 2 4 8 0 2 4 6 8 0 4 6 8 0 2 4 6 0 2 4 6 8 0 2 Chainage 0 2 4 6 8 3 3 4 2 2 2 2 3 3 3 0 1 1 1 1 1 2 9 9 9 0 0 0 0 8 8 8 8 8 9 9 7 7 7 7 7 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0

0 5 10 Metres

Vertical Scale 1:250 Legend 10 Mainline A487 Profile Existing Ground Level 0 5 10 20 50 Metres Proposed Centreline Horizontal Scale 1:1250

© Crown copyright and database rights to 2015 Ordnance Survey 0100031673. Scale at A1 Notes: Client Project Title Drawing Title 1:1250 Role A487 New Dyfi Bridge Figure 2.2 Civil - Highways A487 Plan & Profile Suitability S0 - Initial non-contractual P02.4 ------Sheet 2 of 2 Arup Job No Rev Blythe Gate Blythe Valley Park 244562-00 P02.4 Solihull B90 8AE Name Tel +44 121 213 3000 Fax +44 121 213 3001 www.arup.com Issue Date By Chkd Appd 900237-ARP-ML-XX-DR-CH-00202 Do not scale © Arup A3 Legend !° Culvert Waterbody

Pont Felin-y-ffridd

Foel-y-ffridd

Tributary A f o n

Ffridd D u l a s

Tributary

Pen-y-bont CATCHMENT 1 Area = 0.52 Ha Glan-fechan Outfall direct to river Dyfi 600mm outfall pipe

Metres Millennium Bridge 0 80 160 320 Pont-ar-Ddyfi P01.4 18/01/17 AH MR JP yfi River D Nant Wenlas Rev Date By Chkd Appd

Blythe Gate Blythe Valley Park Ditch Solihull B90 8AE Tel +44 121 213 3000 Fax +44 121 213 3001 www.arup.com

Ditch Client

CATCHMENT 2 Area = 0.46 Ha Project Title Outfall to existing stone culvert (size tbc) under Railway A487 New Dyfi Bridge

Drawing Title Figure 15.1 Surface Water Features and Southern Drainage Ditch Existing Highways Drainage Catchment

Scale at A3 1:6,000 Role Machynlleth Pen yr Allt Specialist Designer - Environmental

Suitability S0 - Initial non-contractual

Arup Job No Rev 244562-00 P01.4 Name 900237-ARP-ZZ-ZZ-DR-YE-00078 © Crown copyright and database rights 2017 Ordnance Survey 0100031673

© Arup A3 Legend !° Culvert Waterbody

Pont Felin-y-ffridd

Foel-y-ffridd

Tributary A f o n

D

Ffridd u l a s

Tributary

Pen-y-bont PROPOSED CATCHMENT 1 Impermeable Area = 0.81 Ha Permeable Area = 0.62 Glan-fechan Outfall direct to River Dyfi

PROPOSED CATCHMENT 3 Millennium Bridge Metres Impermeable Area = 1.26 Ha Pont-ar-Ddyfi Permeable Area = 2.37 Ha 0 80 160 320 Outfall via new ditch to River Dyfi P01.4 16/09/16 AF MR JP yfi r D ve Ri Ditch Rev Date By Chkd Appd

Ditch Blythe Gate Blythe Valley Park Solihull B90 8AE Tel +44 121 213 3000 Fax +44 121 213 3001 www.arup.com

Client PROPOSED CATCHMENT 2 Area = 0.30 Ha Outfall to existing stone culvert (size tbc) under Railway

Project Title A487 New Dyfi Bridge

Drawing Title Southern Drainage Ditch Figure 15.2 Proposed Highways Drainage Catchment

Machynlleth Scale at A3 EMERGENCY PUMP STATION Pen yr Allt 1:6,000 Role Outfall to existing stone culvert (size tbc) Specialist Designer - Environmental under Railway. Suitability S0 - Initial non-contractual

Arup Job No Rev 244562-00 P01.4 Name 900237-ARP-ZZ-ZZ-DR-YE-00042 © Crown copyright and database rights 2015 Ordnance Survey 0100031673

© Arup