ENERGY WORKING FOR BRITAIN Wylfa Newydd Project Main Consultation Document January 2018
Cyhoeddir y ddogfen dechnegol hon yn Saesneg yn unig yn unol â Pholisi laith Gymraeg Horizon. This technical document is published in English only in accordance with Horizon s Welsh Language Policy.
Wylfa Newydd Project Main Consultation Document Contents 1 Introduction... 1 Overview... 1 1.2 The Wylfa Newydd Project... 1 1.3 What is this consultation for?... 4 1.4 Preliminary Environmental Information... 7 1.5 Other Assessments... 8 1.6 Document structure... 9 1.7 Scope to influence the changes... 9 2 The SSSI Compensation Sites... 10 2.1 Introduction... 10 2.2 Stage Three Pre-Application feedback... 10 2.3 Need for the ecological compensation sites... 10 2.4 Selection process for the ecological compensation sites... 10 2.5 Site locations... 11 Ty Du... 11 Cors Gwawr... 13 Cae Canol-dydd... 14 2.6 Emerging scheme design... 15 Ty Du... 15 Cors Gwawr... 16 Cae Canol-dydd... 18 2.7 Habitat Regulations Assessment... 19 2.8 Water Framework Directive... 20 2.9 Preliminary Environmental Information... 20 Ty Du... 21 Cors Gwawr... 29 Cae Canol-dydd... 40 2.10 Proposed mitigation... 51 2.11 Scope to influence the changes... 51 3 Wylfa Newydd Development Area amendments... 52 3.1 Introduction... 52 3.2 Stage Three Pre-Application Consultation feedback... 52 3.3 Requirement for the ecological mitigation areas... 52 3.4 Selection process for the ecological enhancement areas... 53 3.5 Ecological enhancement area works... 53 Site 1 Mynydd-Ithel Reptile Receptor Site... 53 Site 2 Pen Carreg: Notable Wildlife Enhancement Site... 57 3.6 Sub-station connection... 60 3.7 Scope to influence the changes... 61 4 A5025 Off-line Highway Improvements... 62 4.1 Introduction... 62 Page i
Main Consultation Document Wylfa Newydd Project 4.2 Site locations... 62 4.3 Changes since Stage Three Pre-Application Consultation... 64 4.4 A5025 Off-Line Highway Improvements... 64 Section 1 A5 east of Valley Junction to north of Valley Junction (A5/A5025)64 Section 3 north of Llanynghenedl to north of Llanfachraeth... 65 Section 5 south of Llanfaethlu to north of Llanfaethlu... 66 Section 7 north of Llanrhyddlad to north of Cefn Coch... 68 Power Station Access Road Junction... 70 4.5 Scope to influence the changes... 70 5 Amendment to Off-Site Power Station Facilities... 71 6 Amendment to Logistics Centre at Parc Cybi... 73 7 Timetable and next steps... 75 7.1 Introduction... 75 7.2 Details of consultation venues, events and dates... 76 7.3 How we will take responses into account... 76 7.4 Our commitment to ongoing engagement... 76 Appendix A Appendix B List of Appendices Summary of the Stage Three Pre-Application Consultation feedback Sources of environmental information List of Tables Table 2-2 Preliminary Environmental Information: Ty Du ecological compensation site construction... 21 Table 2-3 Preliminary Environmental Information: Ty Du ecological compensation site operation... 25 Table 2-4 Preliminary Environmental Information: Cors Gwawr ecological compensation site construction... 29 Table 2-5 Preliminary Environmental Information: Cors Gwawr ecological compensation site operation... 36 Table 2-6 Preliminary Environmental Information: Cae Canol-dydd ecological compensation site construction... 40 Table 2-7 Preliminary Environmental Information: Cae Canol-dydd ecological compensation site operation... 47 Table 7-1 Consultation activities... 75 List of Figures Figure 1-1 Indicative distribution of existing Wylfa Newydd Project components.. 4 Figure 1-2 Locations of Order Limit changes... 6 Figure 2-1 Strategic Location of Ty Du SSSI Compensation Site... 12 Page ii
Wylfa Newydd Project Main Consultation Document Figure 2-2 Location and Order Limits of Ty Du SSSI Compensation Site... 12 Figure 2-3 Strategic Location of Cors Gwawr and Cae Canol-dydd SSSI Compensation Sites... 13 Figure 2-4 Location and Order Limits of Cors Gwawr and Cae Canol-dydd SSSI Compensation Sites... 14 Figure 2-5 Indicative Proposals at Ty Du... 16 Figure 2-6 Proposals at Cors Gwawr... 18 Figure 2-7 Proposals at Cae Canol-dydd... 19 Figure 3-1 Strategic Location of WNDA and Ecological Mitigation Sites... 54 Figure 3-2 Location and Order Limits of WNDA and Ecological Mitigation Sites. 55 Figure 3-3 Mynydd-Ithel Reptile Receptor Site... 56 Figure 3-4 Pen Carreg Notable Wildlife Enhancement Site... 58 Figure 3-5 Location and Order Limits of the Grid Connection amendments... 61 Figure 4-1 A5025 Highways Improvements... 63 Figure 4-2 Order Limits and alignment of Section 1: A5 east of Valley Junction to north of Valley Junction (A5/A5025)... 65 Figure 4-3 Order Limits and alignment of Section 3 north of Llanynghenedl to north of Llanfachraeth... 66 Figure 4-4 Order Limits and alignment of Section 5: south of Llanfaethlu to north of Llanfaethlu... 68 Figure 4-5 Order Limits and alignment of Section 7 north of Llanrhyddlad to north of Cefn Coch... 69 Figure 5-1 Location of amended Order Limits at Off-Site Power Station Facilities72 Figure 6-1 Location of amended Order Limits at Logistics Centre... 74 Page iii
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Wylfa Newydd Project Main Consultation Document 1 Introduction Overview This Main Consultation Document contains details of the Consultation on Additional Land that is required in respect of proposals for a new nuclear power station and associated development on Anglesey. Collectively, the proposals are referred to as the Wylfa Newydd Project (or the Project) and further details are set out below. This document has been prepared by Horizon Nuclear Power Wylfa Limited (Horizon), one of the Horizon Group of businesses that also includes Horizon Nuclear Power Ltd, a UK energy company seeking to develop a new generation of nuclear power stations. Horizon last consulted on the Project during the summer of 2017 in the form of the Stage Three Pre-Application Consultation which reported on the changes in the consenting process and various design elements of the Project. Since that consultation exercise, additional work has been progressed on the preparation of the Development Consent Order (DCO) application which is scheduled to be submitted at the end of March 2018. As part of that exercise it has been determined that the extent of the area within which the development authorised by the DCO may be constructed, operated and maintained (referred to as the Order Limits) needs to be amended to reflect additional land required for the Project. The extent of the land required to implement the A5025 Off-line Highway Improvements has also been finalised and forms part of this consultation. This Main Consultation Document provides a brief summary of the entire Project but does not repeat all of the information that was provided for previous consultation stages as this consultation is in respect of additional land and the final confirmation of the A5025 Off-line Highway Improvements land. This identifies the additional land that has been determined to be required since the Stage Three Pre-Application Consultation and identifies the final proposed Order Limits relating to the A5025 Off-line Highway Improvements. It also identifies Preliminary Environmental Information (PEI) on the likely significant environmental effects associated with works on this land where appropriate. This approach is consistent with national guidance. 1.2 The Wylfa Newydd Project Horizon is proposing to construct and operate the Wylfa Newydd Project, which comprises the Wylfa Newydd DCO Project, the Licensable Marine Activities and the Enabling Works. Each of these elements is described further below. The Licensable Marine Activities will be consented under a Marine Licence and the Wylfa Newydd DCO Project under a DCO, however there is some overlap between the two; the Marine Works (see below) will be consented under both. Page 1
Main Consultation Document Wylfa Newydd Project Wylfa Newydd DCO Project The Wylfa Newydd DCO Project comprises those parts of the Wylfa Newydd Project which are to be consented by a DCO, namely: Power Station: the proposed new nuclear power station at Wylfa, including two UK Advanced Boiling Water Reactors, the Cooling Water System, supporting facilities, buildings, plant and structures, radioactive waste and spent fuel storage buildings and the Grid Connection; other on-site development: including landscape works and planting, drainage, surface water management systems, public access works including temporary and permanent closures and diversions of public rights of way, new Power Station Access Road and internal site roads, car parking, construction works and activities including construction compounds and temporary parking areas, laydown areas, working areas and temporary works and structures, temporary construction viewing area, diversion of utilities, perimeter and construction fencing, and electricity connections; Marine Works comprising: - Permanent Marine Works: the Cooling Water System, the Marine Off-loading Facility, breakwater structures, shore protection works, surface water drainage outfalls, waste water effluent outfall (and associated drainage of surface water and waste water effluent to the sea), fish recovery and return system, fish deterrent system, navigation aids and Dredging; - Temporary Marine Works: temporary cofferdams, a temporary access ramp, temporary navigation aids, temporary outfalls and a temporary barge berth; Off-site Power Station Facilities: comprising the Alternative Emergency Control Centre (AECC), Environmental Survey Laboratory (ESL) and a Mobile Emergency Equipment Garage (MEEG); Associated Development: the Site Campus within the Wylfa Newydd Development Area; temporary Park and Ride facility at Dalar Hir for construction workers (Park and Ride); temporary Logistics Centre at Parc Cybi (Logistics Centre); and the A5025 Off-line Highway Improvements. The following terms are used when describing the geographical areas related to the Wylfa Newydd DCO Project and the Licensable Marine Activities: Power Station Site the indicative areas of land and sea within which the majority of the permanent Power Station, Marine Works and other on-site development would be situated; and Wylfa Newydd Development Area the indicative areas of land and sea including the Power Station Site and the surrounding areas that would Page 2
Wylfa Newydd Project Main Consultation Document be used for the construction and operation of the Power Station, the Marine Works, the Site Campus and other on-site development. Figure 1-1 shows the locations on Anglesey of the various project components that make up the Wylfa Newydd DCO Project. Licensable Marine Activities The Licensable Marine Activities comprise the Marine Works and the disposal of material from Dredging at the Disposal Site. Enabling Works The Enabling Works comprise the Site Preparation and Clearance Proposals (SPC Proposals) and the A5025 On-line Highway Improvements. Horizon has submitted applications for planning permission for the Enabling Works under the Town and Country Planning Act 1990 to the Isle of Anglesey County Council (IACC). In order to maintain flexibility in the consenting process for the Wylfa Newydd DCO Project, the SPC Proposals have also been included in the application for development consent. The A5025 On-line Highway Improvements are not part of the application for development consent. Figure 1-1 below shows the general physical distribution of the Project components across Anglesey consulted on during Stage Three Pre- Application Consultation. Page 3
Main Consultation Document Wylfa Newydd Project Figure 1-1 Indicative distribution of existing Wylfa Newydd Project components 1.3 What is this consultation for? The Project is a nationally significant infrastructure project, representing an investment on Anglesey of over 10 billion. It is because this is such an important project, both nationally and locally, that Horizon is keen to keep local communities and other key stakeholders informed of changes to its proposals and to get your views on how they can be improved. This consultation exercise is required to enable us to communicate the final extent of the land required in order to implement the Wylfa Newydd Project. It focuses on the additional land that has been determined to be required following additional work undertaken since the Stage Three Pre-Application Consultation. In that context, the changes since the Stage Three Pre-Application Consultation are in relation to the following: inclusion of the SSSI compensation sites within the DCO application; confirmation of the Order Limits in respect of the A5025 Off-line Highway Improvements; and changes to the Order Limits in respect of: the Wylfa Newydd Development Area; the Off-Site Power Station Facilities; and Page 4
Wylfa Newydd Project Main Consultation Document the Logistics Centre. Each of these is explained further below and their locations are illustrated on figure 1-2. Page 5
Main Consultation Document Wylfa Newydd Project Figure 1-2 Locations of Order Limit changes Page 6
Wylfa Newydd Project Main Consultation Document SSSI compensation sites The construction works proposed at the Wylfa Newydd Development Area have the potential to have a significant impact upon Tre r Gof Site of Special Scientific Interest (SSSI) which is located within the Wylfa Newydd Development Area. Although Horizon will employ all reasonable measures to avoid and reduce negative effects on the SSSI, we are proposing to undertake off-site habitat creation and enhancement works at three sites, to ensure we have suitable compensation in place as part of the DCO application should such significant impacts arise. In the event that the effects of the works are not as significant as predicted, the compensation works would represent a significant benefit to Anglesey s network of fenland sites. The details of these sites (referred to as the SSSI compensation sites) are included in chapter 2. Wylfa Newydd Development Area The amendments to the Wylfa Newydd Development Area (WNDA) include the addition of two ecological mitigation areas on the western boundary of the site, and an additional minor amendment to the Order Limits associated with works to secure the connection to the National Grid substation. The works within the ecological enhancement areas have already been undertaken in advance of implementation of the site preparation and clearance works (SPC works). The details of these areas are included in chapter 3. Confirmation of the Order Limits in respect of the A5025 Offline Highway Improvements The extent of the land required to implement the A5025 Off-line Highway Improvements has now been finalised following a period of technical work to establish the extent of land required to implement the A5025 Off-line Highway Improvements. The details of the final Order Limits are set out in chapter 4. Off-site Power Station Facilities A minor amendment to the Order Limits is proposed to incorporate a small additional parcel of land associated with the Off-site Power Station Facilities. The detail of this is included in chapter 5. Land at Logistics Centre A minor amendment to the Order Limits is proposed to incorporate an additional parcel of land on the northern corner of the temporary Logistics Centre located at Parc Cybi. The detail of this is included in chapter 6. 1.4 Preliminary Environmental Information We have assessed the potential environmental effects associated with the additional land subject to this consultation in order to identify relevant PEI. PEI has been extensively set out in previous consultations to establish the basis for the environmental effects that will be subject to more significant consideration in the DCO application. Page 7
Main Consultation Document Wylfa Newydd Project The limited nature of the amendments to the Order Limits being consulted on in this document has resulted in less extensive PEI being presented than in previous consultations. In respect of the A5025 Off-line Highway Improvements, there have only been very minor changes to the proposed physical works (such as landscaping and noise barriers) associated with the construction or operation of the proposed highways so the PEI in respect of the A5025 Off-line Highway Improvements that was provided in previous consultations remains relevant and no further PEI has been provided in this consultation. Similarly, the inclusion of the ecological mitigation areas and the additional land associated with the grid connection at the WNDA would not result in any adverse environmental effects and so we have not provided PEI for those elements. The minor amendments to the Logistics Centre and the Off-Site Power Station Facilities also have no new or different significant adverse environmental effects and so there is no relevant additional PEI information in respect of the minor additions of land to that already provided in previous consultations. PEI is submitted in respect of the SSSI compensation sites, as these are sites that have not been included in previous consultations. This information is included at section 2.9 of chapter 2. 1.5 Other Assessments As well as the Environmental Impact Assessment (EIA), Horizon is continuing to undertake a number of other assessments to identify the potential effects of the Wylfa Newydd Project and inform mitigation measures as appropriate. These include: Welsh Language Impact Assessment; Health Impact Assessment; Equality Impact Assessment; Sustainability Statement; Shadow Habitats Regulations Assessment (HRA); and Water Framework Directive Assessment (WFD). These assessments are at an advanced stage and final assessments will be submitted alongside the EIA as part of the DCO application. We have considered the impact on these assessments of the changes covered by this consultation. Given the limited nature of the changes (in the context of the wider Project), it has been determined that for most of the assessments there are no changes relevant to this consultation. The exception to this is the Shadow HRA and the WFD. Chapter 2 includes a summary of the HRA and WFD implications of the SSSI compensation sites. Page 8
Wylfa Newydd Project Main Consultation Document 1.6 Document structure The remainder of this document is structured as follows: Chapter 2 explains the need for the SSSI compensation sites and the design and management required to achieve the stated objectives of fen habitat creation and enhancement. This chapter also includes PEI in respect of the inclusion of these sites; Chapter 3 describes the amendments to the boundary of the WDNA including the Ecological Mitigation Areas and the amendment required to undertake connection works to the national grid; Chapter 4 sets out the confirmed extent of the Order Limits of the A5025 Off-line Highways; Chapters 5 and 6 explain the minor changes to the Off-Site Power Station Facilities and the Logistics Centre; and Chapter 7 provides details of where and when consultation events will take place and sets out how Horizon will take responses into account and sets out next steps. 1.7 Scope to influence the changes This gives you the opportunity to comment on the changes to and confirmation of the Order Limits described, and any associated works. Horizon welcomes your comments on the following: the proposals for the creation of the SSSI compensation sites, in particular the design of the schemes (see chapter 2); the changes to the Order Limits at the WNDA in respect of the enhancement areas and the grid connection (see chapter 3); the finalisation of the Order Limits associated with the various sections of the A5025 Off-Line Highway Improvements (see chapter 4); and the inclusion within the Order Limits of additional land adjacent to the Offsite Power Station Facilities and the temporary Logistics Centre at Parc Cybi (see chapters 5 and 6). Page 9
Main Consultation Document Wylfa Newydd Project 2 The SSSI Compensation Sites 2.1 Introduction This chapter describes the habitat creation and enhancement works proposed on three sites on Anglesey to compensate for the potential significant effects on Tre r Gof SSSI that could result from the Project. It also provides information on the likely environmental effects and potential mitigation measures associated with these works. 2.2 Stage Three Pre-Application feedback The responses received as a result of the Stage Three Pre-Application Consultation included a number of comments on the potential implications of the Project for the Tre r Gof SSSI. The relevant responses have been summarised and included in Appendix A to this document. 2.3 Need for the ecological compensation sites Environmental assessment undertaken in respect of the Wylfa Newydd Project has identified the potential for adverse effects on the Tre r Gof SSSI due to possible changes to the hydrological and hydrogeological inputs to the SSSI. Horizon s engineers have produced a drainage design which mitigates the potential effects as far as possible, but there remains uncertainty about how the Tre r Gof SSSI will respond to the changes in landform and there is the possibility of a gradual long term deterioration of the rich fen communities for which the SSSI was designated. Although it is possible that the Tre r Gof SSSI will continue to function for the duration of the construction and operational phases of the Project, a precautionary approach has been adopted and we are proposing to create new fen habitat and enhance existing fen habitat to compensate for the potential effects to the SSSI. In the event that the effects of the works on the Tre'r Gof SSSI are not as significant as predicted, the compensation works would represent a significant benefit to Anglesey s network of fenland sites. 2.4 Selection process for the ecological compensation sites A Technical Advisory Group comprising representatives from Horizon, Natural Resources Wales, and Isle of Anglesey County Council, was established to discuss the SSSI compensation sites. The group developed a list of sites on Anglesey which could be suitable and worthy of further consideration. The main criteria taken into consideration in the identification and assessment of suitability of these potential compensation sites were the areas available for rich fen creation and enhancement (as indicated by suitable topography, hydrology, the presence of peat and relic patches of fen vegetation), potential quality of new/enhanced fen areas, proximity to Tre r Gof SSSI, feasibility of successful fen habitat creation/enhancement, the Page 10
Wylfa Newydd Project Main Consultation Document existing land interests at the sites, and the potential for the land to connect to existing fen habitat sites. The initial list included 13 sites which contained habitats similar to those at Tre r Gof SSSI and where the management could be improved, and 34 additional sites which were close or adjacent to existing fen habitats and had potential for fen creation. The list was refined through a series of site visits and desk studies to identify the most suitable sites that would deliver Horizon s objective of no net loss of biodiversity and meet the selection criteria. The final selection identified three sites that best met the objectives and selection criteria: Ty Du; Cors Gwawr; and Cae Canol-dydd. Ty Du was selected due to its potential for restoring existing degraded fen habitat. Although no new rich fen habitat would be created at Ty Du, the site s geographical proximity to Tre r Gof SSSI means that the topographic situation and underlying geology is more similar to Tre r Gof SSSI than the rich fen sites in the south of the island. Tre r Gof SSSI is one of a limited number of rich-fen habitats in the north of Anglesey, and enhancement works on Ty Du would improve the fen resource in a part of the island where it is currently uncommon. Cae Canol-dydd and Cors Gwawr both scored highly against the stated objectives and selection criteria by having good potential for the creation of new rich fen habitat and consolidating existing areas of fen within the Corsydd Môn SAC by linking different SSSI compartments. In total these sites extend to almost 50ha with a total potential for approximately 14ha of new fen habitat creation and some 20ha of fen enhancement, which would result in improved habitat connectivity between currently isolated units of the Anglesey Fens Special Area of Conservation (SAC). 2.5 Site locations Ty Du Ty Du is an 8.1ha plot of land located at the northern end of Anglesey, located between Cemaes and Bull Bay, and around 2.7km east of the Wylfa Newydd Development Area. The location of Ty Du is shown on Figure 2-1. Page 11
Main Consultation Document Wylfa Newydd Project Figure 2-1 Strategic Location of Ty Du SSSI Compensation Site Figure 2-2 Location and Order Limits of Ty Du SSSI Compensation Site The site and its surroundings are used as pasture, for sheep to the north and cattle to the south, although cattle have limited access to the site itself. Most of the land is covered in scrub. Page 12
Wylfa Newydd Project Main Consultation Document Cors Gwawr Cors Gwawr is a 20.5ha plot of land located approximately 3.2km east-northeast from the centre of Llangefni, and approximately 250m east of the village of Talwrn. The site is bounded by two SSSIs, Cors Bodeilio SSSI to the northeast, and Caeau Tawrn SSSI to the west. The location of Cors Gwawr is shown on figures 2-3 and 2-4. Figure 2-3 Strategic Location of Cors Gwawr and Cae Canol-dydd SSSI Compensation Sites Page 13
Main Consultation Document Wylfa Newydd Project Figure 2-4 Location and Order Limits of Cors Gwawr and Cae Canol-dydd SSSI Compensation Sites The majority of the site has previously been drained in order for it to be used as pasture. The northern portion of the site appears to have been improved for grazing cattle, with no evidence of cattle or sheep in the south. The land surrounding the site is used for both sheep and cattle grazing, with minor roads lying along the southern and western boundaries. There are two residential properties in the north-western corner of the site and dairy farms on both its northern and western borders. Cae Canol-dydd Cae Canol-dydd is a 20.9ha plot of land located approximately 2.2km northnorth-east of the centre of Llangefni and approximately 1km west of the village of Talwrn. The central section of the site forms one of the compartments of the Caeau Talwrn SSSI, whilst another borders the site to the south. The location and Order Limits of Cae Canol-dydd is shown on figures 2-3 and 2-4. The northeast area of the site is grazed lightly by cattle and is primarily maintained as cover for game. The surrounding land, including the catchments to the northeast and northwest, has been improved for grazing Page 14
Wylfa Newydd Project Main Consultation Document sheep and cattle. The southern section of the site consists of improved pasture, used for both sheep and cattle grazing, as is the surrounding land. The B5110 lies approximately 150m west of the site and the road to Talwrn lies immediately to the north. A public right of way passes directly through the site. Four farm smallholdings lie within close proximity of the site, three of which lie within the site s surface water catchment. 2.6 Emerging scheme design Ty Du At Ty Du, much of the site was previously fen habitat which through a lack of management is now of poor quality. The proposals at Ty Du are to cut and clear the existing scrub on the site to restore the fen habitats. This would then be managed to maintain its condition through an appropriate grazing regime. The drainage in the southern part of the site would also be modified to enhance the fen condition in that area. Figure 2-5 provides an indication of the proposed works and management at Ty Du. Page 15
Main Consultation Document Wylfa Newydd Project Figure 2-5 Indicative Proposals at Ty Du Cors Gwawr The proposals at Cors Gwawr are a mixture of new fen creation, existing fen enhancement, and secured management of retained fen. New fen would be created by removing the upper topsoil layer from approximately 8.4 hectares to a depth of approximately 30cm to uncover the underlying marl. This would include the removal of a small area of existing scrub. It is currently estimated that approximately 20,000m 3 of topsoil would be stripped in total, but this estimate would be refined by detailed soil sampling across the site. The eventual use of topsoil excavated as part of the fen creation works is still being finalised as Horizon is considering how best to minimise potential environmental effects associated with this element of the works. To inform this consultation exercise, two options for spoil management have been presented: Option 1 All topsoil is stockpiled on site for up to three years before being transported off-site for use elsewhere; and Option 2 All topsoil is transported off site for use elsewhere after it is stripped from the site. The effects associated with both of these options have been considered and are presented in the PEI tables. It is likely that there may be an intermediate option which combines appropriate re-use of the soil on site where possible (e.g. for landscaping) and transport of the remainder off site to be utilised Page 16
Wylfa Newydd Project Main Consultation Document elsewhere on the Wylfa Newydd Project or on other suitable projects. The option ultimately selected would be assessed and the results of the assessment reported in the Environmental Statement accompanying the DCO application. Existing areas of poorly managed fen would be restored through a combination of vegetation clearance and replanting and reseeding of appropriate plant species to create fen mosaics. The drainage system across the site would also be modified to create the required hydrological conditions for optimal fen creation and continued management. The whole site would then be managed via sensitive and appropriate grazing regimes to retain the fen habitats in optimal condition. Areas of the site which are higher and less suited to fen creation would be managed as neutral grassland. A combination of monitoring and adaptive management would ensure that fen establishment, enhancement and conservation is optimised and that adverse effects on adjacent sites are avoided. This adaptive management is likely to include a combination of: detailed onsite and off-site hydrological monitoring and vegetation monitoring; phasing the topsoil stripping works to limit potential sedimentation effects; inclusion of buffer strips between works and sensitive receptors; inclusion of drainage features such as swales and ponds to attenuate flows leaving the site; and strategic deployment of silt fencing. Figure 2-6 provides an indication of the proposed works and management at Cors Gwawr. Page 17
Main Consultation Document Wylfa Newydd Project Figure 2-6 Proposals at Cors Gwawr Cae Canol-dydd The proposals at Cae Canol-dydd are also a mixture of new fen creation, existing fen enhancement and secured management of retained fen. The northern most section of the site has existing good quality fen which would be retained and managed to maintain its good condition. Between this good quality fen area and the Caeau Talwrn SSSI compartment in the centre of the site, is an area of pasture which would be stripped of the top layer of topsoil (up to a depth of approximately 30cm) to establish new fen habitat which would link the two existing fen areas. The Caeau Talwrn SSSI compartment would be managed to retain optimal fen condition in the southern half and to enhance fen condition in the northern half. The southernmost section of the site would also be stripped of the upper layer of topsoil to create new fen habitat which would link the two isolated Caeau Talwrn SSSI compartments on, and to the south of the site. In total, approximately 20,000m 3 of topsoil would be excavated and either stored in stockpiles in the elevated parts of the site where fen creation is not suitable, or transported off site for use elsewhere. This volume estimate would be refined by detailed soil sampling across the site. Drainage across the site would be modified to optimise the hydrological conditions for fen establishment, enhancement and maintenance. The whole site would then be managed via sensitive and appropriate grazing regimes to retain the fen habitats in optimal condition. Page 18
Wylfa Newydd Project Main Consultation Document A combination of monitoring and adaptive management (as described above) would ensure that fen establishment, enhancement and conservation is optimised and that adverse effects on adjacent sites are avoided. Figure 2-7 provides an indication of the proposed works and management at Cae Canol-dydd. Figure 2-7 Proposals at Cae Canol-dydd 2.7 Habitat Regulations Assessment Habitat Regulations Assessment (HRA) is a step by step process that determines the likely significant effects of a plan or project on European Designated Sites, including SACs and Special Protection Areas (SPAs). Where it is concluded that likely significant effects would occur (or where likely significant effects cannot be ruled out) the HRA assesses the effect of the plan or project on the integrity of the relevant European Designated Sites. Horizon is in the process of preparing relevant information to provide the Secretary of State and Natural Resources Wales (NRW) with the information they require to undertake an assessment (termed appropriate assessment ) of whether or not the Project would have an adverse effect on the integrity of any European Designated Site. This information will be provided through a Shadow HRA Report that will be submitted to the relevant Secretary of State in respect of the DCO and to NRW for the Marine Licences and Environmental Permits. Page 19
Main Consultation Document Wylfa Newydd Project The inclusion of the SSSI compensation sites has the potential to influence the conclusions of the Shadow HRA in respect of the creation of wetland habitats. The creation of new fen habitat and the improvement of existing fen habitat would help to link up the fen network in mid-anglesey which includes both the multi-site European Designated Sites Corsydd Môn / Anglesey Fens SAC and Corsydd Môn a Llyn / Anglesey and Llyn Fens Ramsar site. The proposed habitat improvements have the potential for indirect effects on these two European Designated sites. Once works are completed and established, they are anticipated to have a positive effect on the designated sites in terms of buffer and stepping stone effects which could lead to improved species diversity and site resilience. There are some risks relating to effects of release of suspended sediment or nutrients during earthmoving activities and possibly hydrological changes resulting to change in land levels. Horizon will employ adaptive design and management techniques during construction and establishment to ensure that any impacts are kept to a level where adverse effects on the integrity will be avoided. 2.8 Water Framework Directive A project-wide Water Framework Directive Compliance Assessment has been undertaken. It assesses whether activities relating to the Project would lead to deterioration, or prevent attainment of environmental targets, in WFD designated water bodies within the zone of influence of the Project. Activities relating to the SSSI compensation sites have been included within the WFD assessment. To date, the assessment has not identified any activities relating specifically to the SSSI compensation sites which would result in the relevant water bodies (Ynys Mon Central Carboniferous Limestone, Ynys Mon Secondary Groundwater, Anglesey North coastal water body) being non-compliant with the WFD. 2.9 Preliminary Environmental Information All of the SSSI compensation sites are new proposals since the previous Stage Three Pre-Application Consultation so there are no previous assessments which require updating. PEI tables have been prepared to summarise the existing environmental information and likely effects of the SSSI compensation works. All of the PEI tables for this chapter follow the same format where the first column identifies the environmental receptor, the second column identifies the impact and proposed mitigation and the third column describes the potential residual environmental effect. In each case a precautionary approach has been taken so that effects are considered on a worst case basis. As described above (paragraph 2.6.6), the eventual use of topsoil excavated as part of the fen creation works is still being finalised as Horizon is considering how best to minimise potential environmental effects associated with this element of the works. To inform this consultation exercise, two options for spoil management have been presented: Page 20
Wylfa Newydd Project Main Consultation Document Option 1 All topsoil is stockpiled on site for up to three years before being transported off-site for use elsewhere; and Option 2 All topsoil is transported off site for use elsewhere after it is stripped from the site. The effects associated with both of these options have been considered and are presented in the PEI tables. It is likely that there may be an intermediate option which combines appropriate re-use of the soil on site where possible (e.g. for landscaping) and transport of the remainder off site to be utilised elsewhere on the Wylfa Newydd Project or on other suitable projects. The option ultimately selected would be assessed and the results of the assessment reported in the Environmental Statement accompanying the DCO application. Ty Du The PEI tables 2-1 and 2-2 consider the key environmental effects that could arise as a result of the proposals at Ty Du. The first table considers the potential effects during the construction works and the second table considers the potential effects during operation. Table 2-2 Preliminary Environmental Information: Ty Du ecological compensation site construction Environmental receptor Socio-economic Land use: The land is currently being used for grazing livestock though much of the site is currently scrub and therefore access for livestock is limited. Environmental impact and mitigation During construction the scrub vegetation would be cleared. This area is of limited grazing value. Residual effect The exclusion of the scrub area for grazing access during construction is unlikely to result in significant adverse effects as access for livestock is currently limited by dense scrub. Public access and recreation Users of public rights of way: There is one public footpath that runs along part of the western boundary of the site. Traffic and transport The footpath runs along a part of the site which is relatively open so is unlikely to be impacted by scrub clearance works. Should any stoppages or diversions be required, these are likely to be limited in duration. If diversions are required, these would be short in duration and are unlikely to result in significant adverse effects. Page 21
Main Consultation Document Wylfa Newydd Project Environmental receptor Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a few isolated farms within close proximity to the site. Air quality Human receptors: There are a few isolated farms within close proximity to the site. Soils and geology Soil: Some soil sampling has been undertaken but no agricultural value has been attributed. Environmental impact and mitigation During construction there would be some additional traffic movements due to transporting workers and plant to the site. Vehicles numbers would be low as works are primarily limited to scrub clearance. There would be no significant import or export of materials. There would be some noise from scrub clearing works and noise from traffic travelling to and from the site. Most plant is likely to be hand held power tools such as chain saws and strimmers. All works would be undertaken in daylight hours. There would be some emissions from scrub clearing works and from traffic travelling to and from the site. Most plant is likely to be hand held power tools such as chain saws and strimmers. No dust emissions are anticipated. There would be no loss of or impact to soils. Residual effect Works are unlikely to result in significant adverse effects. Most residential receptors are located too far from the site to be affected by noise. Those living closer to the site are unlikely to experience significant adverse effects due to the small scale nature of the works and the daytime only working hours. Traffic volume increases are unlikely to be high enough to result in significant adverse effects. There would be no adverse effects to soils. Page 22
Wylfa Newydd Project Main Consultation Document Environmental receptor Designated sites: The nearest designated site is Llanbadrig Dinas Gynfor SSSI located approximately 650m to the north. Environmental impact and mitigation There would be no direct impacts to the Llanbadrig Dina Gynfor SSSI during construction. Due to the minor nature of the works, intervening distance and lack of connectivity between the sites, it is unlikely that there would be any indirect impact during construction. Residual effect There are unlikely to be any significant adverse effects to the Llanbadrig Dinas Gynfor SSSI during construction. Surface water and groundwater Surface water: A number of drainage ditches run across the site. Ground water: There is a well adjacent to the site. The water table is likely to be shallow. Scrub clearance works are unlikely to impact surface water quality. There is likely to be some modification to the drainage system on site but best practice working methods would mitigate any impacts. No deep excavations or piling, which could result in new contaminant pathways being created, are proposed. There would not be an increase in hardstanding which would reduce groundwater recharge rates. There are unlikely to be any significant adverse effects on surface water quality as a result of the construction works. There are unlikely to be any significant adverse effects on groundwater. Terrestrial and freshwater ecology Designated sites: The site itself is a nonstatutory designated wildlife site called Tir Lleidiog Ty Du Wildlife Site. The nearest statutory designated site is the North Anglesey Marine Candidate Special Area of Conservation (csac) is located approximately 500m to the north west. There would be no direct impacts to the North Anglesey Marine csac during construction. Due to the minor nature of the works, intervening distance and lack of connectivity between the sites, it is unlikely that there would be any indirect impact during construction. There are unlikely to be any significant adverse effects on the North Anglesey Marine csac during construction. Page 23
Main Consultation Document Wylfa Newydd Project Environmental receptor Habitats: There is a mixture of improved scrub and fen habitats of varying quality. Species: A number of important and notable plant species associated with the mire habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Landscape and visual Visual receptors: Visual receptors include users of the public rights of way crossing the site, users of local roads and residents of nearby properties. Environmental impact and mitigation During construction there would be a reduction in the amount of scrub which would be replaced by more valuable mire habitats. The works would be beneficial to the plant species that form the mire habitat. Appropriate surveys would be undertaken prior to scrub clearance works to ensure that protected and notable species are not adversely affected by the works. Any potential adverse effects resulting from the scrub clearance works could be adequately mitigated through the use of standard best practice measures, such as timing of works to avoid sensitive periods in species lifecycles. These would be secured through the CoCP. During construction, plant and works activities would be visible to users of the public rights of way and potentially some residential receptors. However, works would be local in nature and mainly undertaken using hand tools. Residual effect The reduction in scrub and replacement by mire habitats is likely to have a beneficial effect. There is the potential for scrub clearance to result in minor short term adverse effects on species present at the site. However, there is likely to be a longer term beneficial effect for a range of species including rarer plants and animals associated with fen habitat. Impacts would be temporary and are unlikely to result in significant adverse effects. Landscape receptors: The site is within the Anglesey AONB and close to an elevated area of Open Access (Open Country). Works would be small-scale, mainly involving the use of hand tools and are unlikely to impact the character of the AONB or enjoyment of the nearby Open Access land. Impacts will be temporary and are unlikely to result in significant adverse effects. Page 24
Wylfa Newydd Project Main Consultation Document Environmental receptor Archaeology There are 53 heritage assets within 1km of the site (the study area) of which 18 are high value, 14 medium value, 19 low value and 2 negligible value. There are two Scheduled Monuments within the 18 assets of high value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 2 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation The absence of soil stripping from this site means that there is no potential for the disturbance of archaeological remains. Residual effect No significant adverse effects on archaeological remains are likely. Table 2-3 Preliminary Environmental Information: Ty Du ecological compensation site operation Environmental receptor Socio-economic Environmental impact and mitigation Residual effect Land use: The land is currently being used for grazing livestock though much of the site is currently scrub. During operation there would be an increase in land available for grazing. The increased amount of land available for grazing would be a beneficial effect. Public access and recreation Page 25
Main Consultation Document Wylfa Newydd Project Environmental receptor Users of public rights of way: There is one public footpath that runs along part of the western boundary. Traffic and transport Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a few isolated farms within close proximity to the site. Air quality Human receptors: There are a few isolated farms within close proximity to the site. Soils and geology Soil: Some soil sampling has been undertaken but no agricultural value has been attributed. Environmental impact and mitigation Once the site is operational, footpaths and public access would be restored. During operation there would be no increase in traffic above baseline levels. During operation there would be no increase in noise levels. There would be no emissions or dust sources during operation. There would be no loss or impact on soils. Residual effect There are unlikely to be any significant adverse effects on public rights of way, except for a potential minor beneficial effect resulting from improved long-term management. There are unlikely to be any significant adverse effects on road users. There are unlikely to be any significant adverse effects on residential receptors. There are unlikely to be any significant adverse effects on air quality. There are unlikely to be any significant adverse effects on soils. Page 26
Wylfa Newydd Project Main Consultation Document Environmental receptor Designated sites: The nearest designated site is Llanbadrig Dinas Gynfor SSSI located approximately 650m to the north. Environmental impact and mitigation There would be no impacts on the Llanbadrig Dinas Gynfor SSSI during operation. Residual effect There are unlikely to be any significant adverse effects on the Llanbadrig Dinas Gynfor SSSI. Surface water and groundwater Surface water: A number of drainage ditches run across the site. Ground water: There is a well adjacent to the site. The water table is likely to be shallow. Once any necessary modifications to the drainage system have been made there would be no impacts to surface water courses during operation. There would be no impacts on groundwater during operation. There are unlikely to be any significant adverse effects on surface water quality. There are unlikely to be any significant adverse effects on groundwater. Terrestrial and freshwater ecology Designated sites: The site itself is a nonstatutory designated wildlife site called Tir Lleidiog Ty Du Wildlife Site. The nearest statutory designated site is the North Anglesey Marine Candidate Special Area of Conservation (csac) is located approximately 500m to the north west. Habitats: There is a mixture of scrub and mire habitats of varying quality. The habitat quality of Tir Lleidiog Ty Du Wildlife Site would improve. There would be no direct impacts to the North Anglesey Marine csac during operation. Due to the minor nature of works, intervening distance and lack of connectivity between the sites, there would also be no indirect impacts during operation. During operation the mire habitats would be managed to develop and maintain high quality habitats. During the operational phase, the habitat quality of the site would improve resulting in beneficial effects to Tir Lleidiog Ty Du Wildlife Site. There would not be any adverse effects on the North Anglesey Marine csac. The management of mire habitats is likely to result in a beneficial effect through maintaining a larger area of higher quality mire habitat. Page 27
Main Consultation Document Wylfa Newydd Project Environmental receptor Species: A number of important and notable plant species associated with the mire habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Landscape and visual Visual receptors: Visual receptors include users of the public rights of way crossing the site, and residents of nearby properties. Environmental impact and mitigation It is anticipated that the site would support a more diverse range of rare and notable plant and animal species associated with fen habitat. Protected and notable species surveys would be undertaken to ensure that long term management is appropriate for any such species. There may also be potential to implement specific management measures for water vole, reptiles, amphibians and marsh fritillary butterfly. The loss of scrub and replacement by mire is unlikely to result in visual impacts. Residual effect There are likely to be beneficial effects on the notable species associated with the mire habitats including plant and invertebrate species. Impacts would be temporary and are unlikely to result in significant adverse effects. Landscape receptors: The site is within the Anglesey AONB and close to an elevated area of Open Access (Open Country). Archaeology Scrub removal and its replacement by mire habitat is unlikely to result in impacts to designated areas or landscape character. Impacts would be temporary and are unlikely to result in significant adverse effects. Page 28
Wylfa Newydd Project Main Consultation Document Environmental receptor There are 53 heritage assets within 1km of the site (the study area) of which 18 are high value, 14 medium value, 19 low value and 2 negligible value. There are two Scheduled Monuments within the 18 assets of high value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 2 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation During operation no impacts would occur on any archaeological remains. Residual effect There are unlikely to be any significant adverse effects on archaeological remains. Cors Gwawr The PEI tables 2-3 and 2-4 consider the key environmental effects that could arise as a result of the proposals at Cors Gwawr. The first table considers the potential effects during the construction works and the second table considers the potential effects during operation. Table 2-4 Preliminary Environmental Information: Cors Gwawr ecological compensation site construction Environmental receptor Socio-economic Environmental impact and mitigation Residual effect Land use: The land is currently being used for grazing livestock. During construction when the topsoil layer is removed, there would be a reduction in the availability of grazing. Some grazing would still be required in the parts of the site where there is existing fen that requires management. A slight reduction in the agricultural output from the site would not be likely to result in significant adverse effects. Page 29
Main Consultation Document Wylfa Newydd Project Environmental receptor Environmental impact and mitigation Residual effect Public access and recreation Users of public rights of way: There are two designated public footpaths across the site. Traffic and transport Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a number of residential properties within close proximity to the site and the village of Talwrn is located approximately 250m west of the site. Air quality During construction the footpaths would likely either be temporarily stopped up or diverted to allow the topsoil layer to be removed. Temporary diversions would result in a minor increase to pedestrian journeys. During construction there would be some additional traffic movements due to transporting workers and plant to the site. If topsoil is transported off site (Option 2) works would be phased to minimise effects associated with vehicle movements. There would be some noise from construction plant during topsoil stripping and any reprofiling of the site. However these works would be relatively small scale. If spoil is to be removed from the site (Option 2), lorry movements could increase noise levels. All works would be undertaken in daylight hours and, if necessary, numbers and timing of lorry movements restricted to minimise effects. A slight increase in the journeys for walkers along the public footpaths is unlikely to result in significant adverse effects. With appropriate phasing of works, a slight short-term increase in local traffic is unlikely to result in significant adverse effects. Most residential receptors are located too far from the site to be affected by noise. Those that are living closer to the site are unlikely to experience significant effects due to the small scale nature of the works, which would not differ substantially from normal agricultural activities, and the daytime only working hours. Managing the number and timing of lorry movements taking spoil from the site would ensure significant adverse effects are avoided. Page 30
Wylfa Newydd Project Main Consultation Document Environmental receptor Human receptors: There are a number of residential properties within close proximity to the site and the village of Talwrn is located approximately 250m west of the site. Soils and geology Soil: Predictive Agricultural Land Classification maps for Wales show that most of the site is likely to be graded as 3b moderate quality agricultural land. Environmental impact and mitigation There would be some emissions from traffic and plant travelling to and from the site, although it is anticipated worker traffic and movement of construction plant would be minimal. If spoil is to be removed from the site (Option 2), lorry movements could affect local air quality. If necessary, numbers and timing of lorry movements would be restricted to minimise effects. Removal and handling of topsoil could generate dust. A dust risk assessment would be undertaken and any mitigation measures required to ensure a significant adverse effect does not occur would be identified. Option 1: Topsoil would be stripped and stored on the site, potentially being lost as a resource. Option 2: Topsoil would be transported off site for appropriate use elsewhere, only being lost as a resource in the highly unlikely event that no suitable use is identified and the topsoil had to be disposed of as a waste. Residual effect Traffic volume increases associated with construction plant and worker movements are unlikely to be high enough to result in significant adverse effects. Managing the number and timing of lorry movements taking spoil from the site would ensure significant adverse effects are avoided. Option 1: There is likely to be a potential significant adverse effect associated with loss of the topsoil resource. Option 2: There is unlikely to be significant adverse effects, assuming that a suitable use is identified for the topsoil. Surface water and groundwater Page 31
Main Consultation Document Wylfa Newydd Project Environmental receptor Surface water: A number of drainage ditches run across the site. Ground water: Two wells are recorded within the site on the 1:25,000 Ordnance Survey map. A spring was also observed close to one of the wells indicating a shallow groundwater table. Environmental impact and mitigation During the topsoil stripping there is a risk of increased sediment loading from surface water runoff which could reduce surface water quality. This would be easily mitigated through best practice working methods, including use of silt fencing and attenuation ponds. The risk of effects to water quality is lowest for Option 2, with no topsoil storage on site. If soil is to be stored on site (Option 1) a soil prepared and a monitoring regime implemented to inform any additional mitigation that might be required. No deep excavations or piling, which could result in new contaminant pathways being created, are proposed. There would not be an increase in hardstanding which would reduce groundwater recharge rates. Topsoil storage on site (Option 1) is unlikely to affect recharge rates, with no possibility of effect associated with Option 2 (all topsoil removed from site). If considered necessary, monitoring regimes would be implemented to inform any additional mitigation required. Residual effect There are unlikely to be any significant adverse effects to surface water quality as a result of the construction works. There are unlikely to be any significant effects on groundwater. Terrestrial and freshwater ecology Page 32
Wylfa Newydd Project Main Consultation Document Environmental receptor Designated sites: Caeau Talwrn SSSI and Cors Bodeilio SSSI are alkaline fens within the Corsydd Môn SAC and Ramsar Site, and border the site. Parts of the SSSI are also designated as a National Nature Reserve. Habitats: There is a mixture of improved grasslands and fen habitats of varying quality. Environmental impact and mitigation There would be no direct land take of neighbouring designated sites but there could be indirect effects from noise, dust, and changes to the drainage system. These could be mitigated through best practice methods of working which would be secured through the Wylfa Newydd Code of Construction Practice (CoCP). In addition, the detailed design would be informed by the outputs of ongoing hydrological monitoring and any potential effects managed through adaptive management. Construction works would result in the loss of low value improved grassland as the topsoil is stripped to remove it as a nutrient-rich substrate and expose the underlying nutrientpoor sub-soil. This would coincide with works to improve the existing fen habitat. Residual effect It is unlikely that there would be any significant adverse effects to the neighbouring designated sites during construction. The loss of low value pasture is unlikely to result in any significant adverse effects, whilst the improvement of the fen habitat would be a significant positive benefit of the scheme. Page 33
Main Consultation Document Wylfa Newydd Project Environmental receptor Species: A number of important and notable plant species associated with the fen habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Landscape and visual Visual receptors: Visual receptors include users of the public rights of way crossing the site, and residents of nearby properties. Environmental impact and mitigation The works to improve and restore the fen habitat would be beneficial to the associated plant species that form the habitat. Protected and notable species surveys would be undertaken prior to fen creation works to ensure that any such species are not significantly affected by the works and that favourable conservation status is maintained. Any potential adverse effects resulting from the construction works could be adequately mitigated through the use of standard best practice measures such as timing of works to avoid sensitive periods in species lifecycles. These mitigation measures would be secured through the CoCP. During construction, plant and works activities would be visible to users of the public rights of way and potentially some residential receptors. Residual effect There is the potential for minor short term adverse effects occurring to species present as the construction works clear the site and begin to develop and manage fen habitat. However, as the habitats develop and become established, there is likely to be a beneficial effect for a range of species including rarer plants and animals associated with fen habitat. Visual impacts would arise due to changes in landform (Option 1 only) and removal of some landscape features, but are unlikely to result in significant adverse visual effects. Option 2 is unlikely to result in any significant adverse effects. Page 34
Wylfa Newydd Project Main Consultation Document Environmental receptor Landscape receptors: Landscape receptors include landscape character, land form and features such as hedges and trees or scrub. Archaeology There are 81 heritage assets within 1km of the site (the study area) of which one is high value, 14 medium value, 60 low value and 6 negligible value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 7 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation There would be localised changes to landscape including land form arising from topsoil storage (Option 1 only) and localised loss of landscape features including hedges and trees. The magnitude of effects associated with Option 2 would be less, with all topsoil being removed from site. There would be no effect on any archaeological remains. Likely effects of negligible adverse significance are identified for the setting of seven buildings and on two historic landscapes. There is the potential that during the creation of the compensation sites unknown archaeological remains would be removed. Mitigation would comprise an archaeological desk based assessment, evaluation (for example geophysical survey and/or trial trenching) and mitigation comprising recording in advance of creation of the fen habitat and determination of the results of this recording. The nature, scope and scale of these works will be agreed with Gwynedd Archaeological Planning Service. Residual effect Landscape effects from soil stockpiles (Option 1 only) and loss of some vegetation features would be permanent but as these effects are localised, they are unlikely to result in significant adverse effects to the wider landscape character. Any archaeological remains uncovered on site would be dealt with appropriately and in agreement with Gwynedd Archaeological Planning Service so that no significant adverse effects would be likely to arise. Page 35
Main Consultation Document Wylfa Newydd Project Table 2-5 Preliminary Environmental Information: Cors Gwawr ecological compensation site operation Environmental receptor Socio-economic Environmental impact and mitigation Residual effect Land use: The land is currently being used for grazing livestock. The conversion of pasture to fen may reduce the potential income of the land from grazing. There would still be a need to graze the land to maintain the quality of the fen habitats although grazing intensity would be lower than at present. However, this reduction in intensity could be offset by the use of rare breed livestock and organic farming practices, the outputs of which command a higher premium. A slight reduction in the agricultural output from the site is unlikely to result in significant adverse effects and could result in beneficial effects due to the increased return that might be achieved from organic rare breed produce. Public access and recreation Users of public rights of way: There are two designated public footpaths across the site. Traffic and transport Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a number of residential properties within close proximity to the site and the village of Talwrn is located approximately 250m west of the site. Once the site is operational, footpaths and public access would be restored. During operation there would be no increase in traffic above baseline levels. During operation there would be no increase in noise levels. There are unlikely to be any significant adverse effects on public rights of way. There may potentially be a minor beneficial effect from improved long-term management. There are unlikely to be any significant adverse effects on road users. There are unlikely to be any significant adverse effects on residential receptors. Page 36
Wylfa Newydd Project Main Consultation Document Environmental receptor Air quality Human receptors: There are a number of residential properties within close proximity to the site and the village of Talwrn is located approximately 250m west of the site. Soils and geology Soil: Predictive Agricultural Land Classification maps for Wales show that most of the site is likely to be graded as 3b moderate quality agricultural land. Environmental impact and mitigation There would be no emissions or dust sources during operation. Any potential impacts on soil would occur during construction. No operational impacts are anticipated for Option 1 or Option 2. Residual effect There are unlikely to be any significant adverse effects on air quality. There are unlikely to be any significant adverse effects on soil. Surface water and groundwater Surface water: A number of drainage ditches run across the site. Ground water: Two wells are noted within the site on the 1:25,000 ordnance survey map. A spring was also observed close to one of the wells indicating a shallow groundwater table. Once any necessary modifications to the drainage system have been made there would be no impacts to surface water courses during operation. There will be no impacts on groundwater during operation. There are unlikely to be any significant adverse effects on surface water quality. There are unlikely to be any significant adverse effects on groundwater. Terrestrial and freshwater ecology Page 37
Main Consultation Document Wylfa Newydd Project Environmental receptor Designated sites: Caeau Talwrn SSSI and Cors Bodeilio SSSI are alkaline fens within the Corsydd Môn SAC and Ramsar Site, and border the site. Parts of the SSSI are also designated as a National Nature Reserve. Habitats: There is a mixture of improved grasslands and fen habitats of varying quality. Species: A number of important and notable plant species associated with the fen habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Environmental impact and mitigation During operation, the area of high quality fen habitat would increase and existing fen would be managed more effectively. This would have a beneficial effect on the area s ecology. This would also link the two adjacent SSSIs strengthening connectivity and resilience across the Corsydd Môn SAC and Ramsar site. During operation there would be an increase in the amount of fen habitat and existing fen habitat would be enhanced. It is anticipated that the site would support a more diverse range of rare and notable plant and animal species associated with fen habitat. Protected and notable species surveys would be undertaken to ensure that long term management is appropriate for any such species associated with or potentially occurring at the site. There may also be potential to implement specific management measures for water vole, reptiles, amphibians and marsh fritillary butterfly. Residual effect There are likely to be beneficial effects on the Caeau Talwrn SSSI, Cors Bodeilio SSSI, and Corsydd Môn SAC and Ramsar site. The SSSI compensation site itself would also benefit from increased connectivity with the designated sites. There is likely to be a beneficial effect on the quality of habitats present on site. There are likely to be beneficial effects on the notable species associated with the fen habitats, including plant and invertebrate species. Landscape and visual Page 38
Wylfa Newydd Project Main Consultation Document Environmental receptor Visual receptors: Visual receptors include users of the public rights of way crossing the site, and residents of nearby properties. Landscape receptors: Landscape receptors include landscape character, land form and features such as hedges and trees or scrub. Archaeology Environmental impact and mitigation During operation there would be a change from pasture to fen, both of which are habitats characteristic of the local landscape. With Option 1, there would be a visual impact associated with the topsoil stockpiles. There would be no such impact associated with Option 2, as all excavated topsoil would be removed from the site. There would be localised permanent changes to landscape including land form arising from soil stockpiles and localised loss of landscape features including hedges and trees. With Option 1, there would be a visual impact associated with the topsoil stockpiles. There would be no such impact associated with Option 2, as all excavated topsoil would be removed from the site. Residual effect Even if topsoil is stored on site, impacts on views from the stockpiled topsoil are unlikely to be significant. Impacts from permanent soil stockpiles (Option 1 only) and loss of some hedges and trees would be localised and are unlikely to result in significant effects on the wider landscape character. Page 39
Main Consultation Document Wylfa Newydd Project Environmental receptor There are 81 heritage assets within 1km of the site (the study area) of which one is high value, 14 medium value, 60 low value and 6 negligible value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 7 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation During operation no impacts would occur to any archaeological remains. Residual effect There are unlikely to be any significant adverse effects on archaeological remains during operation. Cae Canol-dydd The PEI tables 2-5 and 2-6 consider the key environmental effects that could arise as a result of the proposals at Cae Canol-dydd. The first table considers the potential effects during the construction works and the second table considers the potential effects during operation. Table 2-6 Preliminary Environmental Information: Cae Canol-dydd ecological compensation site construction Environmental receptor Socio-economic Environmental impact and mitigation Residual effect Land use: The land is currently being used for grazing livestock. During construction when the topsoil layer is removed, there would be a reduction in the availability of grazing. Some grazing would still be required in the parts of the site where there is existing fen which requires management. A slight reduction in the agricultural output from the site is unlikely to result in significant adverse effects. Public access and recreation Page 40
Wylfa Newydd Project Main Consultation Document Environmental receptor Users of public rights of way: There is one public footpath that runs across the site. Traffic and transport Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a number of residential properties within close proximity to the site. Air quality Environmental impact and mitigation During construction the footpath would likely either be temporarily stopped up or diverted to allow the topsoil layer to be removed. Temporary diversions would result in a minor increase to pedestrian journeys. During construction there would be some additional traffic movements due to transporting workers and plant to the site. If topsoil is transported off site (Option 2), works would be phased to minimise effects associated with vehicle movements. There would be some noise from construction plant during topsoil stripping and any reprofiling of the site. However, these works would be relatively small scale. If spoil is removed from the site (Option 2), lorry movements could increase noise levels. All works would be undertaken in daylight hours and, if necessary, numbers and timing of lorry movements would be restricted to minimise effects. Residual effect A slight increase in the journeys for walkers along the public footpaths is unlikely to result in significant adverse effects. With appropriate phasing of works, a slight short-term increase in local traffic would be unlikely to result in significant adverse effects. Most residential receptors are located too far from the site to be affected by noise. Those living closer to the site are unlikely to experience significant effects due to the small scale nature of the works, which would not differ substantially from normal agricultural activities. Page 41
Main Consultation Document Wylfa Newydd Project Environmental receptor Human receptors: There are a number of residential properties within close proximity to the site. Soils and geology Soil: Predictive Agricultural Land Classification maps for Wales show that most of the site is likely to be graded as 3b moderate quality agricultural land. Environmental impact and mitigation There would be some emissions from traffic and plant travelling to and from the site although it is anticipated worker traffic and movement of construction plant will be minimal. If spoil is removed from the site (Option 2), lorry movements could affect local air quality. If necessary, numbers and timing of lorry movements would be restricted to minimise effects. Removal and handling of topsoil could generate dust. A dust risk assessment would be undertaken to identify any mitigation measures required to ensure no significant adverse effects occur. Option 1: Topsoil would be stripped and stored on the site, potentially being lost as a resource. Option 2: Topsoil would be transported off site for appropriate use elsewhere, only being lost as a resource in the highly unlikely event that no suitable use is identified and the topsoil had to be disposed of as a waste. Residual effect Traffic volume increases associated with construction plant and worker movements are unlikely to be high enough to result in significant adverse effects. Option 1: There is likely to be a potential significant adverse effect associated with loss of the topsoil resource. Option 2: There are unlikely to be significant adverse effects, assuming that a suitable use is identified for the topsoil. Surface water and groundwater Page 42
Wylfa Newydd Project Main Consultation Document Environmental receptor Surface water: A number of drainage ditches and an unnamed Ordinary Watercourse run across the site. Ground water: Two wells are noted within the site on the 1:25,000 ordnance survey map. A spring was also observed towards the north of the site indicating a shallow groundwater table. Environmental impact and mitigation During the topsoil stripping there is a risk of increased sediment loading from surface water runoff which could reduce surface water quality. This would be easily mitigated through best practice working methods, including use of silt fencing and attenuation ponds. The risk of effects to water quality is lowest for Option 2, with no topsoil storage on site. If soil is to be stored on site (Option 1), a soil management plan would be prepared and a monitoring regime implemented to inform any additional mitigation that might be required. No deep excavations or piling, which could result in new contaminant pathways being created, are proposed. There will not be an increase in hardstanding which would reduce groundwater recharge rates. Topsoil storage on site (Option 1) is unlikely to affect recharge rates, with no possibility of effect associated with Option 2 (all top soil removed from site). If considered necessary, monitoring regimes would be implemented to inform any additional mitigation required. Residual effect There are unlikely to be any significant adverse effects on surface water quality as a result of the construction works. There are unlikely to be any significant effects on groundwater. Terrestrial and freshwater ecology Page 43
Main Consultation Document Wylfa Newydd Project Environmental receptor Designated sites: The site includes a compartment of the Caeau Talwrn SSSI whilst a second compartment abuts the southern boundary of the site. Caeau Talwrn SSSI is an alkaline fens and a constituent unit of the Corsydd Môn SAC and Ramsar site. Habitats: There is a mixture of improved grasslands and fen habitats of varying quality. Environmental impact and mitigation No capital works are proposed at the SSSI compartment within the site and no direct impacts would occur to the neighbouring SSSI compartment, but there could be indirect effects from noise, dust, and changes to the drainage system. These could be mitigated through best practice methods of working which would be secured through the CoCP. In addition, the detailed design would be informed by the outputs of ongoing hydrological monitoring and any potential effects managed through adaptive management. Construction works would result in the loss of low value improved grassland as the topsoil is stripped to remove it as a nutrient-rich substrate and expose the underlying nutrientpoor sub-soil. This would coincide with works to improve the existing fen habitat. Residual effect There are unlikely to be any significant adverse effects on the Caeau Talwrn SSSI or Corsydd Môn SAC. The creation of new fen habitat and the improvement of existing fen habitat would help to link the two adjoining SSSI compartments which would strengthen the fen network resulting in a beneficial effect on the SSSIs and the Corsydd Môn SAC and Ramsar site. The loss of low value pasture is unlikely to result in any significant adverse effects, whilst the improvement of the fen habitat would be a significant beneficial effect. Page 44
Wylfa Newydd Project Main Consultation Document Environmental receptor Species: A number of important and notable plant species associated with the fen habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Landscape and visual Visual receptors: Visual receptors include users of the public rights of way crossing the site, and residents of nearby properties. Environmental impact and mitigation The works to improve and restore the fen habitat would be beneficial to the associated plant species that form the habitat. Protected and notable species surveys would be undertaken prior to fen creation works to ensure that any such species are not significantly affected by the works and that favourable conservation status is maintained. Any potential adverse effects resulting from the construction works could be adequately mitigated through the use of standard best practice measures such as timing of works to avoid sensitive periods in species lifecycles and precautionary methods of working, which would be secured through the CoCP. During construction, plant and works activities would be visible to users of the public rights of way and potentially some residential receptors. Residual effect There is the potential for minor short term adverse effects occurring to species present as the construction works clear the site and works are undertaken to develop and manage fen habitat. However, as the habitats develop and become established, there is likely to be a beneficial effect on a range of species including rarer plants and animals associated with fen habitat. For Option 1, visual impacts would arise due to changes in landform and could result in significant adverse effects for some visual receptors. Option 2 is unlikely to result in any significant adverse effects. Page 45
Main Consultation Document Wylfa Newydd Project Environmental receptor Landscape receptors: Landscape receptors include landscape character, land form and features such as hedges and trees or scrub. Archaeology There are 68 heritage assets within 1km of the site (the study area) of which one is high value, 12 medium value, 48 low value and 8 negligible value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 9 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation There would be localised changes to landscape including landform arising from soil storage (Option 1 only) and localised loss of landscape features including pasture land, hedges and trees. The magnitude of effects associated with Option 2 would be less, with all topsoil being removed from site. There would be no effect on any archaeological remains. Likely effects of negligible adverse significance are identified for the setting of seven buildings and on two historic landscapes. There is the potential that during the creation of the compensation sites unknown archaeological remains would be removed. Mitigation would comprise an archaeological desk based assessment, evaluation (for example geophysical survey and/or trial trenching) and mitigation comprising recording in advance of creation of the fen habitat and determination of the results of this recording. The nature, scope and scale of these works will be agreed with Gwynedd Archaeological Planning Service. Residual effect Landscape effects from soil stockpiles (Option 1 only) and loss of some vegetation features would be permanent but as these effects are localised, they are unlikely to result in significant adverse effects to the wider landscape character. Any archaeological remains uncovered on site would be dealt with appropriately and in agreement with Gwynedd Archaeological Planning Service so that no significant adverse effects would be likely to arise. Page 46
Wylfa Newydd Project Main Consultation Document Table 2-7 Preliminary Environmental Information: Cae Canol-dydd ecological compensation site operation Environmental receptor Socio-economic Environmental impact and mitigation Residual effect Land use: The land is currently being used for grazing livestock. The conversion of pasture to fen may reduce the potential income of the land from grazing. There would still be a need to graze the land to maintain the quality of the fen habitats although grazing intensity would be lower than at present. However, this reduction in intensity could be offset by the use of rare breed livestock and organic farming practices, the outputs of which command a higher premium. A slight reduction in the agricultural output from the site is unlikely to result in significant adverse effects and could result in beneficial effects due to the increased returns that might be achieved from organic rare breed produce. Public access and recreation Users of public rights of way: There is one public footpath that runs across the site. Traffic and transport Road users: Existing users of local roads. Noise and vibration Residential receptors: There are a number of residential properties within close proximity to the site. Soils and geology Once the site is operational, footpaths and public access would be restored. During operation there would be no increase in traffic above baseline levels. During operation there would be no increase in noise levels. There are unlikely to be any significant adverse effects on public rights of way, except for a potential minor beneficial effect from improved long-term management. There are unlikely to be any significant adverse effects on road users. There are unlikely to be any significant adverse effects on residential receptors. Page 47
Main Consultation Document Wylfa Newydd Project Environmental receptor Soil: Predictive Agricultural Land Classification maps for Wales show that most of the site is likely to be graded as 3b moderate quality agricultural land. Environmental impact and mitigation Any potential impacts on soil would occur during construction. No operational impacts are anticipated for either Option 1 or Option 2. Residual effect There are unlikely to be any significant adverse effects on soil. Surface water and groundwater Surface water: A number of drainage ditches and an unnamed Ordinary Watercourse run across the site. Ground water: Two wells are noted within the site on the 1:25,000 ordnance survey map. A spring was also observed towards the north of the site indicating a shallow groundwater table. Once any necessary modifications to the drainage system have been made there would be no impacts to surface water courses during operation. There would be no impacts on groundwater during operation. There are unlikely to be any significant adverse effects on surface water quality. There are unlikely to be any significant adverse effects on groundwater. Terrestrial and freshwater ecology Page 48
Wylfa Newydd Project Main Consultation Document Environmental receptor Designated sites: The site includes a compartment of the Caeau Talwrn SSSI whilst a second compartment abuts the southern boundary of the site. Caeau Talwrn SSSI is an alkaline fens comprising a constituent unit of the Corsydd Môn SAC and Ramsar site. Habitats: There is a mixture of improved grasslands and fen habitats of varying quality. A number of important and notable plant species associated with the fen habitat are present. No targeted surveys have been undertaken but Cofnod data and the habitats present indicate the potential for protected and notable species to be present. Environmental impact and mitigation During operation, the area of high quality fen habitat would increase and existing fen would be managed more effectively. This would be have a beneficial effect on the area s ecology. This would also link the two adjacent SSSIs strengthening connectivity and resilience across the Corsydd Môn SAC and Ramsar site. During operation there would be an increase in the amount of fen habitat, and existing fen habitat would be enhanced. It is anticipated that the site would support a more diverse range of rare and notable plant and animal species associated with fen habitat. Protected and notable species surveys would be undertaken to ensure that long term management is appropriate. There may also be potential to implement specific management measures for water vole, reptiles, amphibians and marsh fritillary butterfly. Residual effect There are likely to be beneficial effects on the Caeau Talwrn SSSI and Corsydd Môn SAC and Ramsar site. The site itself would also benefit from increased connectivity with the designated sites. The creation of new fen habitat and the improvement of existing fen habitat would help to link the two adjoining SSSI compartments. This would be likely to strengthen the fen network and result in a beneficial effect on the SSSIs and the Corsydd Môn SAC and Ramsar site. There is likely to be a beneficial on the quality of habitats present on site. There are likely to be beneficial effects on the notable species associated with the fen habitats including plant and invertebrate species. Landscape and visual Page 49
Main Consultation Document Wylfa Newydd Project Environmental receptor Visual receptors: Visual receptors include users of the public rights of way crossing the site, and residents of nearby properties. Landscape receptors: Landscape receptors include landscape character, land form and features such as hedges and trees / scrub. Archaeology There are 68 heritage assets within 1km of the site (the study area) of which one is high value, 12 medium value, 48 low value and 8 negligible value. The potential for unknown archaeological remains within the site has been assessed to be moderate. 9 important hedgerows as defined under the Hedgerow Regulations 1997 have been identified within the study area. Environmental impact and mitigation During operation there would be a change from pasture to fen, both of which are habitats characteristic of the local landscape. With Option 1, there would be a visual impact associated with the topsoil stockpiles. There would be no such impact associated with Option 2 as all excavated topsoil would be removed from the site. There would be localised permanent changes to landscape including landform arising from soil stock piles (Option 1 only) and localised loss of landscape features including hedges and trees. During operation no impacts would occur to any archaeological remains. Residual effect Significant permanent visual impacts may occur during the operational period for one visual receptor due to views of topsoil stockpiles (Option 1 only). There are unlikely to be any significant visual effects associated with topsoil Option 2. Landscape impacts from permanent soil stockpiles and loss of some hedges and trees would be localised and are unlikely to result in significant adverse effects on the wider landscape character. There are unlikely to be any significant adverse effects on archaeological remains during operation. Page 50
Wylfa Newydd Project Main Consultation Document 2.10 Proposed mitigation The ecological compensation sites are themselves mitigation for the potential effects to Tre r Gof SSSI. The works proposed at the three sites are designed to be ecologically beneficial by improving the value and quality of habitats and connecting designated sites. Notwithstanding this, there is a potential for adverse effects due to the proposed works in respect of noise, air emissions, landscape and visual changes, and changes to water quality. It is considered that these can all be mitigated through the implementation of best practice working methods secured through the CoCP and an 'adaptive management approach to the construction and operational phases of the work. This approach would include (but not be limited to): phasing of works, with incremental changes to topsoil stripping, drainage and other works, over two seasons; monitoring on and off-site before, during and following works; adaptive management of water flows; and enhanced revegetation, for example by planting or using nursery crops. The above approach would allow for any issues to be identified and resolved as and when they arise. In addition to mitigating potential impacts, an adaptive management approach would enable a responsive approach to habitat creation and enhancement, ensuring greater success of the compensation proposal. There is also scope for reducing residual landscape and visual effects through additional mitigation relating to the siting and design of permanent soil stockpiles, creation of new banks and planting of native hedges and trees. 2.11 Scope to influence the changes The proposals set out in this document are for the creation and/or enhancement of wetland habitat on Anglesey to compensate for any potential impact we may have on the Tre r Gof SSSI. The proposed sites at Ty Du, Cors Gwawr and Cae Canol-Dydd have been selected following the technical consideration of a large number of sites on Anglesey. The scope to influence changes is therefore available in respect of the proposed design and management of these sites, and how the proposals might be amended in order to best realise the stated objective of wetland enhancement/creation. Page 51
Main Consultation Document Wylfa Newydd Project 3 Wylfa Newydd Development Area amendments 3.1 Introduction The Order Limits changes associated with the WNDA relate to two areas of land required to mitigate the potential effects of the proposed SPC works on notable species and reptiles. These areas are referred to as the Notable Wildlife Enhancement Site and the Reptile Receptor Site respective and collectively as the Ecological Mitigation Areas. The other minor changes to the Order Limits are associated with the existing National Grid sub-station immediately to the south-east of the Existing Power Station. These amendments are required to implement necessary connection works. This chapter describes the additional land proposed to be included within the Order Limits and, in respect of the Ecological Mitigation Areas, the works that have been undertaken to achieve the ecological mitigation objectives. The limited nature of the operations to be undertaken within the revised Order Limits has led to the conclusion that there are no likely significant environmental effects associated with these areas of land and associated works. 3.2 Stage Three Pre-Application Consultation feedback The responses received as a result of the Stage Three Pre-Application Consultation included the need to establish ecological mitigation and comments on connection to the national grid. These responses are summarised and included in appendix A to this document. 3.3 Requirement for the ecological mitigation areas The Environmental Impact Assessments (EIAs) undertaken in respect of the SPC Proposals and the Wylfa Newydd Project have identified the need for areas of land outside of the WNDA for ecological mitigation. These areas comprised the Reptile Receptor Site and the Notable Wildlife Enhancement Site. As part of the ecological mitigation for predicted effects associated with the Wylfa Newydd Project, Horizon proposes to enhance the ecological carrying capacity of the Ecological Mitigation Areas located adjacent to the western boundary of the WNDA: Site 1 Mynydd-Ithel: Reptile Receptor Site consists of a single 5.1 hectare parcel of land located at Mynydd-Ithel and is required to receive common lizard and adder translocated from the WNDA; and Site 2 Pen Carreg: Notable Wildlife Enhancement Site constitutes three parcels of land that collectively extend to approximately 15 hectares located to the north and south of Cemlyn Road at Pen Carreg. The site is required to provide alternative habitat and a suitable dispersal corridor for Page 52
Wylfa Newydd Project Main Consultation Document fauna displaced from the WNDA during site clearance works, in particular those species of principal conservation importance in Wales, listed in accordance with Section 7 of the Environment (Wales) Act 2016. Enhancement works at both sites have been completed in order to enhance the ecological carrying capacity of the Ecological Mitigation Areas and to ensure that the habitats are suitably established to receive species translocated or displaced from the WNDA during the SPC works, which are currently scheduled to commence during 2018, subject to the grant of planning permission. The sites have been leased by Horizon for a period of 15 years and will be managed until new landscaping within the WNDA has sufficiently established to accommodate local faunal species of nature conservation value. We are seeking to include the Ecological Mitigation Areas within the DCO to ensure we are able to manage the sites for as long as is required, including beyond the term of the leases if necessary. 3.4 Selection process for the ecological enhancement areas A search was undertaken to identify suitable ecological mitigation sites with 500m of the WNDA (i.e. the area in which Horizon has undertaken ecological surveys to inform the EIA). Site suitability was assessed against the following criteria: location (proximity to the WNDA and connectivity with other habitats) in the case of the Notable Wildlife Enhancement Site, it needed to be adjacent to the WNDA and provide a corridor to suitable habitats in the wider landscape, free from barriers such as main roads and settlements; habitat quality both sites needed to have the potential to be enhanced to improve their suitability for reptiles / other notable wildlife; the ability of Horizon to secure an interest in the land. This search resulted in the identification of one suitable Reptile Receptor Site at Mynydd-Ithel and one suitable Notable Wildlife Enhancement Site at Pencarreg. 3.5 Ecological enhancement area works Site 1 Mynydd-Ithel Reptile Receptor Site The Mynydd-Ithel Reptile Receptor Site is located immediately adjacent to the south-west boundary of the current Order Limits of the WNDA in the vicinity of the house of the same name. Figure 3-1 illustrates the general location of the site. Figure 3-2 shows the additional area included within the Order Limits associated with the Reptile Receptor Site. Page 53
Main Consultation Document Wylfa Newydd Project Figure 3-1 Strategic Location of WNDA and Ecological Mitigation Sites Page 54
Wylfa Newydd Project Main Consultation Document Figure 3-2 Location and Order Limits of WNDA and Ecological Mitigation Sites The total area of land within the amended Order Limits is 8.24 hectares, and includes a farmhouse and a number of associated structures and grazing land. The Reptile Receptor Site itself extends to 5.1 hectares (shown on Figure 3-3) and has historically been grazed, although no grazing has taken place since 2016. Page 55
Main Consultation Document Wylfa Newydd Project Figure 3-3 Mynydd-Ithel Reptile Receptor Site The property is accessed from the west from Nanner Road via an access track which crosses the Afon Cafnan that forms the western boundary. Nant Caerdegog Isaf, a tributary of the Afon Cafnan forms the northern boundary of the property, with the rest of the site defined by field boundaries. A number of public right of way cross the land on generally north-south and east-west axes. The work undertaken during winter 2017/2018 within the proposed amended Order Limits has involved the minor operations summarised below and illustrated on Figure 3-3: Reptile fencing Approximately 975m of reptile exclusion fencing has been installed to prevent reptiles from accessing the land immediately adjacent to the farmhouse and the fields that will be retained for grazing by the landowner. Vegetation clearance Scrub clearance has been undertaken in the north eastern corner of the site to create an open area within the existing dense scrub, providing an enhanced habitat mosaic for reptiles. The clearance works will maximise edge habitat by scalloping the existing scrub edge. A strip of land immediately to the east of the farmhouse will also be cleared to enable access from the eastern boundary of the property. Refuge creation Page 56
Wylfa Newydd Project Main Consultation Document Ten reptile refuges have been created, each measuring approximately 4m by 2m and no more than 1m in height. They have been constructed from a mixture of logs, brash, grass cuttings, stone and topsoil/turf. In addition to the refuges, 30 smaller piles of logs, brash and stones (recovered from the site wherever possible) have been placed adjacent to field boundaries at appropriate locations around the site to provide smaller refuges for reptiles and other wildlife. Planting Tree and scrub planting has been implemented to enhance existing field boundaries, create a new field boundary and create new scrub patches. A total of some 1,600 trees/shrubs have been planted, positioned to maximise edge habitat (i.e. by scalloping the boundary edges and creating planting islands adjacent to boundaries). A diverse mix of local provenance native hedgerow species have been used, including : blackthorn (Prunus spinosa); dog rose (Rosa canina); dog wood (Cornus sanguinea); field maple (Acer campestre); goat willow (Salix caprea); hawthorn (Crataegus monogyna); spindle (Euonymus europaeus); wild privet (Ligustrum vulgare); elder (Sambucus nigra); English elm (Ulmus procera); holly (Ilex aquifolium); oaks (Quercus robur, Q. petraea); rowan (Sorbus aucuparia); and wild cherry (Prunus avium). A long-term management plan for the site is currently being prepared. Site 2 Pen Carreg: Notable Wildlife Enhancement Site The Pen Carreg Notable Wildlife Enhancement Site consists of three parcels of land located adjacent to the north-west boundary of the current Order Limits of the WNDA between Porth y Felin and Cemlyn Bay. Figure 3-1 illustrates the general location of the site. Figure 3-2 shows the additional area included within the Order Limits associated with the Notable Wildlife Enhancement Site. The enhancement site extends to 15.1 hectares and has historically been grazed, although no grazing has taken place since 2016. The three parcels of land straddle Cemlyn Road and the two larger parcels to the north of the road are separated by Pen Carreg farmhouse and a Page 57
Main Consultation Document Wylfa Newydd Project former outbuilding converted into a bungalow known as Maen y Bugael. Access to all three parcels is gained via existing gates from Cemlyn Road. The Afon Cafnan forms the eastern boundary of the southern parcel of land and an unnamed tributary of the Afon Cafnan forms the eastern boundary of the eastern parcel. A public right of way roughly follows the route of the tributary. The work undertaken during winter 2017/2018 within the proposed amended Order Limits has involved minor operations summarised below and illustrated on Figure 3-4: Figure 3-4 Pen Carreg Notable Wildlife Enhancement Site Scrape creation Existing topographical depressions present at the Notable Wildlife Enhancement Site were identified for the formation of shallow scrapes in the southern parcel of land. A total of four scrapes have been be created: two measuring approximately 20m by 5-10m, and two measuring approximately 5m by 5m, all with scalloped/rounded edges to maximise edge habitat and give a natural appearance. The creation of each scrape involved excavation to a depth no greater than 40cm below existing ground level. Southern ditch and water course enhancement The ditch on the southern boundary of the site has been enhanced by the installation of three wooden sluice gates and the re-profiling of the bank Page 58
Wylfa Newydd Project Main Consultation Document sections up to 20m upstream of the gates within 5m of the existing ditch edge. The bank re-profiling has been undertaken so as to maximise edge habitat / habitat heterogeneity and give a natural appearance. Approximately a third of the tall ruderal, reed and scrub vegetation along the ditch and the adjacent section of the Afon Cafnan has been cleared to create several open sections of riparian habitat. Central wetland enhancement An area of open water has been created within a pre-existing wetland area within the centre of the site by removing dense swamp vegetation. This comprises a central area of open water with a diameter of approximately 20m with several open water projections up to 5m long by 1m wide. In addition, a 5-10m section of the ditch which runs through the centre of the site has been cleared of dense vegetation to create an area of open water. Refuge creation Eight wildlife refuges have been created each measuring approximately 4m by 2m and no more than 1m in height. They have been constructed from a mixture of logs, brash, grass cuttings, stone and topsoil/turf (recovered from the site ) In addition, 30 smaller piles of logs, brash and stones (recovered from the site) will be placed adjacent to field boundaries at appropriate locations around the site to provide smaller refuges for a variety of species. Planting Tree and scrub planting has been implemented to enhance existing field boundaries, create new field boundaries and create new scrub patches. A total of 8,000 trees and shrubs have been planted within the proposed planting areas. The planting has been located to maximise edge habitat (i.e. by scalloping the boundary edges and creating planting islands adjacent to boundaries). A diverse mix of local provenance native hedgerow species has been planted including: blackthorn; dog rose; dog wood; field maple; goat willow; hawthorn; spindle and wild privet; elder; English elm; holly; oaks; rowan; and Page 59
Main Consultation Document Wylfa Newydd Project wild cherry. A long-term management plan for the site is currently being prepared. Livestock fencing Livestock fencing has been installed to protect the areas of new planting and enable control of livestock movements. Fencing has also been installed along the ditches and watercourses (at a 10m offset) to prevent poaching by livestock. Gate installation Fifteen field access gates have been installed to provide vehicular and livestock access to all field compartments. These gates are a minimum of 3.6m wide. Meadow enhancement The fields have not been grazed since spring 2016 and a rank sward started to develop. In order to increase habitat structural heterogeneity and reduce nutrient levels (which will in turn promote increased floral diversity), approximately 50% of the grassland area has been mowed across the site using a hammer flail. The mowing was targeted so as to create a network of short glades bordered by rank swards. The rank areas include long stretches suitable for barn owl foraging. The arisings were collected and retained where possible for use in the refuges. Seeds were also collected where viable and considered beneficial for improvement of other parts of the site. A hammer flail scarified the soil following which the scarified areas will be seeded with seeds / green hay collected from local (i.e. Anglesey) speciesrich meadows (including that harvested elsewhere within the site). The seeds include yellow rattle (Rhinanthus minor) to help reduce the dominance of grasses in the sward. Seeding will be undertaken in the autumn to increase the chances of successful germination and establishment. Water Trough Installation Water troughs (with adequate water supply connections) will be installed at up to five locations to be agreed with the grazing tenant to ensure year round access to drinking water for livestock. The troughs will be fitted with floats to prevent barn owls and other birds from getting trapped and drowning. 3.6 Sub-station connection The output from the Power Station will be supplied to the National Grid via the existing sub-station located immediately to the south east of the Existing Power Station. The Order Limits previously consulted on excluded the sub-station in its entirety from the Wylfa Newydd Development Area. In order to clarify the location of the work to be undertaken by Horizon to complete the connection, minor variations to the Order Limits have been made. Figure 3-5 illustrates the amendment to the boundary which consists of the inclusion within the Order Limits of parts of the sub-station shown at Stage Page 60
Wylfa Newydd Project Main Consultation Document Three Pre-Application Consultation as part of the Existing Power Station but which have now been included as a part of the proposed Power Station. These areas will contain equipment which is required to connect the Power Station to the sub-station. The scope of works associated with the connection have not changed from those described in the Stage Two Pre- Application Consultation. Figure 3-5 Location and Order Limits of the Grid Connection amendments We have assessed the minor variation to the spatial extent of the Order Limits and, using professional judgement, have concluded that there will be no environmental effects as a result of this amendment. 3.7 Scope to influence the changes We have extended the Order Limits on the western side of the WNDA to accommodate the two new Ecological Mitigation Sites we have created at Mynydd-Ithel and Pen Carreg. We would be pleased to receive any comments that you might have on these sites. The amendment to the Order Limits required in respect of the grid connection is minor, however should you have any comments on this, we would be pleased to consider those. Page 61
Main Consultation Document Wylfa Newydd Project 4 A5025 Off-line Highway Improvements 4.1 Introduction Improvements to the A5025 form an important part of the Project as construction traffic will have to use this highway from the A55 Junction 3 and the A5, to the east of Valley, in order to access the Wylfa Newydd Development Area. The condition of the A5025 would be a concern even if the Project did not proceed as surveys indicate that it does not meet current highway standards. Improvements therefore need to be made to meet the needs of existing and future highway users, as well as to meet the specific construction and operational needs of the Project. Our preferred package of improvements seeks to address issues such as substandard width, alignment and overtaking opportunities. The proposals would prevent further deterioration of the road and assist in mitigating the risks associated with increased construction workers and materials. They would also leave a legacy of an improved highway network. In the light of the above, Horizon is continuing to propose a package of highways improvements to the A5025. These improvements include both on-line solutions, comprising the replacement of the existing carriageway and minor widening (the A5025 On-line Highway Improvements), and off-line solutions, which comprise new sections of bypass and improvements to straighten bends in some locations (the A5025 Off-line Highway Improvements). A planning application for the implementation of the A5025 On-line Highway Improvements was submitted to the IACC for determination in November 2017. One of the main aims of these improvements continues to be to address potential highway safety and capacity issues caused by an increase in traffic movements as a result of the Project. In addition, the A5025 Off-line Highway Improvements seek to address potential environmental effects on communities, including noise from increased road traffic and severance, and to allow two HGVs to pass each other safely at the same time in opposite directions. 4.2 Site locations The A5025 between Valley and the Power Station Site is approximately 16.5km in length and can broadly be divided into 8 sections. Sections 1, 3, 5 and 7 relate to the sections where Horizon is proposing A5025 Off-line Highway Improvements as shown on figure 4-1. Sections 2, 4, 6 and 8 continue to relate to the sections where Horizon is proposing A5025 On-line Highway Improvements: Section 1 A5 east of Valley Junction to north of Valley Junction (A5/A5025); Section 2 north of Valley Junction (A5/A5025) to north of Llanynghenedl; Section 3 north of Llanynghenedl to north of Llanfachraeth; Page 62
Wylfa Newydd Project Main Consultation Document Section 4 north of Llanfachraeth to south of Llanfaethlu; Section 5 south of Llanfaethlu to north of Llanfaethlu; Section 6 north of Llanfaethlu to north of Llanrhyddlad; Section 7 north of Llanrhyddlad to north of Cefn Coch; Section 8 north of Cefn Coch to Power Station Access Road Junction; and Power Station Access Road Junction. Figure 4-1 A5025 Highways Improvements Page 63
Main Consultation Document Wylfa Newydd Project 4.3 Changes since Stage Three Pre-Application Consultation The Stage Three Pre-Application Consultation included the arrangement of the alignment of the A5025 Off-line Highway Improvements. The responses to the Stage Three Pre-Application Consultation in respect of the proposed alignment are summarised in Appendix A. In order to facilitate and secure the works associated with the construction of the road, and to enable the road to operate effectively in the future, the area covered by the Order Limits of the road are more extensive than the alignment. Horizon has been working extensively with our design teams to ensure that the Order Limits incorporate all of the land required to facilitate the A5025 Off-Line Highway Improvements. This takes into account land within which works such as drainage schemes, landscaping, and ecological mitigation will be accommodated. This consultation is therefore focused on the Order Limits rather than the layout of the road alignment which has been subject to any material change since Stage Three Pre-Application Consultation. PEI in respect of the construction and operation of each of the sections of A5025 Off-line Highways Improvements has previously been provided in the Stage Two Pre-Application Consultation (in Volume C of the Stage Two Pre-Application Consultation PEI Report) and in the Stage Three Pre-Application Consultation (in Tables 6-12 and 6-13 of the Stage Three Pre-Application Consultation Main Consultation Document). Information that has been provided as part of the previous consultations is available on our website (see Appendix B for further details). Similarly, there is no further mitigation proposed in respect of the construction or operation of the A5025 Off-line Highways Improvements that has not been considered in previous pre-application consultations. In this context the following summarises for information the extent of the Order Limits and briefly confirms the design of the road for each of Sections 1, 3, 5 and 7 and the Power Station Access Road Junction. 4.4 A5025 Off-Line Highway Improvements Section 1 A5 east of Valley Junction to north of Valley Junction (A5/A5025) The extent of the Order Limits and the alignment of Section 1 is illustrated on Figure 4-2. The area of land occupies some 12.5 hectares in total, defined by the A5 to the south and to the north by the A5025, a field boundary and commercial and residential properties of Valley. The extent of the Order Limits incorporates areas required for flood compensatory storage areas, ecological enhancement, works to existing drainage ditches and outfalls under the existing A5, and essential landscape mitigation to the new works. Page 64
Wylfa Newydd Project Main Consultation Document The purpose of this alignment is to bypass Valley to the east of the village, between the A5 (south of Valley) and a new junction with the A5025 to the north of Valley. A four-arm roundabout continues to be proposed at the southern extent (section 1). The roundabout is proposed to be located away from the village of Valley in order to minimise the impacts of noise, vibration and air quality. Figure 4-2 Order Limits and alignment of Section 1: A5 east of Valley Junction to north of Valley Junction (A5/A5025) Section 3 north of Llanynghenedl to north of Llanfachraeth The section of A5025 Off-Line Highway Improvement between Llanynghenedl and Llanfachraeth involves the creation of a by-pass of approximately 2km in length, within the Order Limits that occupy some 20.0 hectares. The extent of the Order Limits and the alignment of Section 3 is illustrated on Figure 4-3. The Order Limits incorporate flood attenuation ponds for highway surface water runoff, essential landscape mitigation and ecological mitigation areas. The bypass is proposed to improve visibility, avoid an increase in vehicles passing in opposite directions through the village, and to provide increased safe overtaking opportunities. The bypass will be located to the east of the village and partially in a cutting to minimise the impact of noise and vibration. Within the southern part of the Order Limits, the Afon Alaw and its floodplain will be crossed by means of a viaduct. Page 65