Glyn Rhonwy Pumped Storage Development Consent Order

Design & Access Statement

PINS Reference EN010072

Document No. 8.03

Regulation 5(2)(q)

Author Bilfinger GVA

Revision Date Description

0 October 2015 Submission Version The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

Contents

Executive Summary...... 1

1 Introduction ...... 4

2 Site Appraisal & Proposals ...... 9

3 Context Appraisal: Economic, Social, Physical & Policy ...... 15

4 Design Proposals ...... 24

5 Conclusion ...... 55

Appendices

Appendix A – Site Location Plan

Appendix B – DCO Order Limits

Appendix C – Historic Environment Features

Appendix D – Development Overview

Appendix E – Indicative Layout Plans

Appendix F – Indicative Sections & Elevations

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Abbreviations

AOD Above Ordnance Datum

CoCP Code of Construction Practice

DCO Development Consent Order

DDA Disability Discrimination Act

EIA Environmental Impact Assessment

ES Environmental Statement

GC Gwynedd Council

GUDP Gwynedd Unitary Development Planning

LPA Local Planning Authority

LVIA Landscape and Visual Impact Assessment

MoD Ministry of Defence

MMP Materials Management Plan

MW Megawatt

NP National Park

NPS National Policy Statement

NRW Natural Resources Wales

NSIP Nationally Significant Infrastructure Project

NTS Non-Technical Summary

PEIR Preliminary Environmental Impact Report

PINS Planning Inspectorate

PPW Planning Policy Wales

PRoW Public Right of Way

Q1 Quarry 1 (Chwarel Fawr)

Q2 Quarry 2 (Chwarel Cefn Du)

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Q3 Quarry 3 (Cook)

Q4 Quarry 4 (Ddol)

Q5 Quarry 5 (unnamed but locally known as “Film Set Quarry”)

Q6 Quarry 6 (Glyn Rhonwy)

Q7 Quarry 7 (unnamed)

Q8 Quarry 8 (former munitions store locally known as “the bombstore”)

QBC Quarry Battery Company

SAC Special Area of Conservation

SoS Secretary of State

SPG Supplementary Planning Guidance

SPH Snowdonia Pumped Hydro

SSSI Site of Special Scientific Interest

STOR Standing Operating Reserve

T&CPA Town and Country Planning Act

TAN Technical Advice Note

WG Welsh Government

WSP Wales Spatial Plan

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Executive Summary

This Design and Access Statement has been prepared in line with TAN 12: Design, whilst taking account of the criteria for good design in energy infrastructure provided by NPS EN-1, in support of an application for a Development Consent Order (DCO) for the construction and operation of a 99.9MW (output capacity) pumped storage facility at (the Development) Glyn Rhonwy and Chwarel Fawr Quarries, near Llanberis in North Wales.

"Development of a pumped storage facility with an output capacity of 99.9MW, including a headpond at Chwarel Fawr together with associated dam and spillway infrastructure; an underground penstock; a tailpond at Glyn Rhonwy together with associated dam and spillway infrastructure to Llyn Padarn; powerhouse and ancillary buildings including underground turbine hall and access shaft, and underground tailrace to the tailpond; an underground pumping station together with surface level control box; and associated engineering, remediation and landscaping works, together with the diversion of public roads and rights of way and ancillary works".

The Development site is located on the slopes of Cefn Du Mountain, approximately 1.5km to the north west of Llanberis and 11km south east of the town of Caernarfon. The area subject to the DCO application is located wholly within the administrative area of Gwynedd Council and extends to a total of 91.24 hectares, which comprises of several disused quarries and slate tips, as well as land in between and surrounding the quarries which includes woodland, grazing land and the industrial estate platform at the eastern end of the site.

The proposed facility will be used in a variety of scenarios; however the primary role of pumped storage is that of ‘grid-balancing’. The facility will make use of abundant cheaper electricity during the night, and is then able to release energy to the grid extremely quickly in order to meet load balancing and peak demand requirements.

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The quarries represent a unique opportunity for electricity storage that is scarce in the UK as a whole. Given the proximity of Dinorwig Power Station, one of the key economic benefits of the scheme is the clustering of industry, which is a well- established principle of economic development. As well as Dinorwig Power Station, the surrounding area is generally reliant on public sector employment, the tourism industry and the Siemens site.

Three main options for the configuration of the pumped storage facility were considered as part of the design process, and the design evolved through eight review stages in connection with the approved 49.9MW scheme and then the 99.9MW DCO Development. The design of the Development has been informed by consultation with the public and statutory consultees, influences on the economic viability of the development and on-going investigation and feasibility works required to ensure the scheme is environmentally acceptable. The design evolution of the Development has largely evolved as an ongoing balancing exercise between its environmental impact and the project’s overall deliverability.

The following key benefits of the Development have been identified through the context appraisal and the assessment of design and access considerations:

Several design options were considered and the best all-round option taken forward in the DCO application;

The development will provide economic benefits through employment opportunities, local interest and the clustering of industry;

Local concerns have been responded to in various ways, including altering the scope of the ES, the location of the pumping station and amending PRoW diversions;

The re-use of site-won materials in the construction of dams will ensure that the development has a minimised impact on a highly sensitive landscape;

Much of the Development is below ground and therefore visually unobtrusive;

All appropriate environmental surveys have been undertaken and the impacts have been found to be acceptable; and

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Technologies such as pumped storage will allow the intermittency of renewable energy generation to be countered and assist in essential balancing of the electricity distribution network.

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1 Introduction

1.1 Context

1.1.1 This Design & Access Statement (DAS) has been prepared by Bilfinger GVA, on behalf of Snowdonia Pumped Hydro Limited (SPH), in support of an application for a Development Consent Order (DCO) pursuant to the Planning Act 2008 (’the Act’). The development for which the Applicant is seeking consent (‘the Development’) is the construction and operation of a pumped storage facility with an output capacity of 99.9 Megawatts (MW) at Glyn Rhonwy and Chwarel Fawr Quarries, near Llanberis in North Wales. This DAS should be read in conjunction with the application package, including the Environmental Statement (ES) (Document Ref: 6.02 – 6.04) and the Planning Statement (Doc Ref: 8.01).

1.1.2 As the Development comprises an electricity generating station with a capacity of more than 50MW, it constitutes a Nationally Significant Infrastructure Project (NSIP) under Section 15 of the Act. Accordingly, it requires development consent under Section 31 of the Act. Development consent may only be granted by order (a DCO) following an application to the Secretary of State for Energy and Climate Change (SoS) pursuant to Section 37 of the Act.

1.1.3 Snowdonia Pumped Hydro Limited (“SPH”) is the applicant for the DCO. The company is a subsidiary of the Quarry Battery Company Limited (“QBC”) which seeks to develop disused quarry systems into pumped storage facilities.

1.1.4 QBC was granted planning permission (Ref: C12/1451/LL) by GC on the 19th February 2014 for the construction and operation of a 600MWh (megawatt hours) pumped storage scheme, with a capacity of 49.9MW, at the Glyn Rhonwy and Chwarel Fawr quarries, near Llanberis. The permission was granted under the Town & Country Planning Act 1990 (T&CPA). An application (Ref: C15/0308/15/DA) for a non-material

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amendment (NMA) (was submitted in March 2015 to correct an inaccuracy in the plans listed under Condition 2 of the extant permission. The application was approved on 6th May 2015 and Condition 1 of the NMA approval lists the approved plans correctly.

1.1.5 The Development subject to the DCO application seeks to increase the output capacity of the approved scheme to 99.9MW. The fundamental difference between the approved scheme and the development is the installation of more powerful turbines within the power house, allowing greater output capacity.

1.1.6 The location of the Development site is shown on the plan below (a full version of which is submitted as Document Ref: 2.01, and a copy is included in Appendix A to this statement).

1.1.7 The purpose of this DCO is to allow for the installation of a pumped storage facility on the slopes of Cefn Du Mountain, which provides a unique opportunity for electricity storage. The Development comprises the following major components:

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one headpond (Q1 – Chwarel Fawr), its dam, access shaft and spillway infrastructure to the Nant Y Betws;

one tailpond (Q6 – Glyn Rhonwy), its dam, access shaft and spillway infrastructure to Llyn Padarn;

a pumping station at Llyn Padarn - which extracts water when necessary to ‘top up’ levels within the pumped storage system (and contributes to its original filling);

a power house at Glyn Rhonwy Industrial Estate Platform 5 (south of Q6) which includes turbines and pumps approximately 70m below ground level;

a penstock (connecting Q1 to the power house); and

a tailrace (connecting the power house to Q6).

1.1.8 The application does not include any ‘associated development’ (e.g. grid connection or highway improvements) as these types of development cannot form part of DCO applications in Wales, in accordance with Section 115 of the Act.

1.1.9 The extent and location of the Development site is shown on the following figure (denoted by a red line). The full scale version of this plan, the ‘existing layout plan’, is submitted with the DCO application as Document Ref: 2.02, and a ‘not to scale’ version is included in Appendix B to this statement.

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1.1.10 Snowdonia Pumped Hydro (hereafter referred to as “SPH”) is a subsidiary of Quarry Battery Company (hereafter referred to as “QBC”) and is the Applicant for the DCO. QBC identify and utilise disused quarry systems for the construction of pumped storage facilities. The Glyn Rhonwy site is the developer’s pilot scheme and it is therefore envisaged that further subsidiaries, similar to SPH, will be established in the future to take forward other sites.

1.1.11 SPH has agreements in place to cover the vast majority of the land identified for the Development (see the plan in Appendix B for the order limits). The order limits include several disused quarry pits and slate tips, land in between and surrounding the quarries comprising of woodland, grazing land and the industrial estate platform at Glyn Rhonwy, as well as a small section of Llyn Padarn.

1.1.12 This statement has been prepared to demonstrate how the design of the Development has been fully considered in line with the design requirements and recommendations of the Overarching National Policy Statement (NPS EN-1), together with Technical Advice Note 12: Design (TAN 12) and the

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Town and Country Planning (Development Management Procedure) (Wales) Order 2012 [as amended].

1.1.13 In addition to this statement, the DCO application is also supported by a Planning Statement, Environmental Statement (ES), and a suite of other reports, plans and drawings.

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2 Site Appraisal & Proposals

2.1 Site Location and Description

2.1.1 The Development site is located on the slopes of Cefn Du mountain above Llyn Padarn, centred at National Grid reference SH 56268 60660. The area subject to the DCO application is located wholly within the administrative area of Gwynedd Council and extends to a total of 91.24 hectares, which comprises of several disused quarries and slate tips, as well as land in between and surrounding the quarries which includes woodland, grazing land and the industrial estate platform.

2.1.2 The site is located approximately 1.5km to the north west of Llanberis and 11km south east of the town of Caernarfon. A glacially formed lake (Llyn Padarn) lies adjacent to the north east of the site and part of the Order Limits extend to within the lake. The location of the Development is illustrated on the plan included in Appendix A, which has also been submitted as a standalone drawing (Document Reference: 2.01).

2.1.3 Three adopted highways cross the site, including the A4086, Ffordd Clegir and an unnamed road (locally known as ‘the Green Road’ or the ‘Llanberis- Waunfawr Mountain Road’).

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2.1.4 The village of Llanberis represents the nearest settlement to the development site and has a population of approximately 2000 people. The village originally grew to support the slate quarrying industry previously operational at the application site and consequently, much of the built form of the village comprises terraced housing typical of Britain’s industrial era in the 19th and 20th centuries. Since the demise of the industry (which is discussed below in Section 2.2), the area relies in-part on a tourism-based economy, but much local employment is also provided by Dinorwig Power Station, which lies to the east of the village, and the Siemens site to the south of the Order Limits.

2.1.5 The village is served well by local amenities. Llanberis High Street contains various shops, banks, restaurants/takeaways and other facilities. Similar facilities are also present at other locations in the village and surrounding area. Furthermore, there is a primary school, two doctor’s surgeries, a dental surgery and a post office. The area also contains several tourism and leisure facilities, such as museums, climbing centres, water sports and paintballing.

2.1.6 On the site itself, water has collected in two of the quarries, especially in Quarry 6 (Q6) with an estimated depth of approximately 17m.

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2.1.7 The slopes around the quarries are built up with slate waste and interspersed with the remains of outhouses and quarry workings, scattered over steep grazing land. The neighbouring land is mainly agricultural, although there are light industrial land uses between Glyn Rhonwy and Llyn Padarn, and a large industrial complex to the south of the site towards Llanberis.

2.1.8 Although access to the Development site was improved by the development of the Glyn Rhonwy Industrial Estate, access to the majority of the Development site remains restricted and the quarries themselves are fenced off. Some quarries and buildings, including the Industrial Estate itself, have suffered vandalism in the form of fly-tipping, graffiti and damage to the fencing to facilitate unauthorised access.

2.1.9 Aside from Llanberis (1.5km to the south east), the villages of Cwm-y-Glo and Brynrefail (2km to the north west) and Waunfawr (2km to the west), the area around the Development site is only sparsely populated with residential land uses. Due to the popularity of the area for tourism, there are various holiday accommodation sites nearby. These include campsites north of the Order Limits near Cwm-Y-Glo and to the south in Llanberis; as well as hotels and bed & breakfasts in Llanberis itself, and a caravan park currently under construction close to the eastern end of the Order Limits.

2.1.10 The site is located within and also in close proximity to designated sites; Llyn Padarn to the east is a Site of Special Scientific Interest (SSSI). The site itself is within a Landscape Character Area designated for its historical interest as an important former slate quarrying location and is also within the Dinorwig Landscape of Outstanding Historical Interest. Furthermore, it is located 1km from the boundary of the Snowdonia National Park.

2.1.11 There are several archaeological and cultural heritage sites within proximity to the Development site. There are no World Heritage Sites, Registered Parks and Gardens, Registered Battlefields, or Conservation Areas within 1km of the Order Limits. However there is one Scheduled Ancient Monument within this area and two Grade II Listed Buildings.

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2.2 The Development

2.2.1 The development comprises of:

one headpond (Q1), its dam, access shaft and spillway infrastructure to the Nant Y Betws;

one tailpond (Q6), its dam, access shaft and spillway infrastructure to Llyn Padarn;

a pumping station at Llyn Padarn;

a power house at Glyn Rhonwy Industrial Estate Platform 5 (south of Q6);

a penstock (connecting Q1 to the power house); and

a tailrace (connecting the power house to Q6).

2.2.2 The description of the Development, as found on the application form, is as follows:

2.2.3 Pumped storage facilities require upper and lower storage reservoirs, known as the head and tail ponds respectively. Water is released from the upper reservoir and passes through turbines to generate electricity, before being released into the tailpond. Water is generally pumped back up to the headpond during the night when there is usually a surplus of electricity, available at a cheaper rate (due to ‘base load’ power stations generating power 24 hours a day).

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2.2.4 The energy from a pumped storage facility can be made available extremely quickly in order to meet the load balancing that is required by the distribution grid. Hydro-electric power stations have a very long working life and subsequently, the Development will remain operational for 125 years. Once constructed, they have minimal pollution or waste. As electricity is required to pump water from the tailpond to the headpond, pumped storage power stations run at a net loss of energy and are generally considered to be approximately 80% efficient. However, as is described throughout the supporting documentation submitted with this DCO, they serve a vital role within the electricity distribution system in the UK.

2.2.5 The development will be connected to the electricity distribution network via a new electrical connection. This will be exported from an onsite substation, adjacent to the power house, to an offsite connection point at Pentir. However the electrical connection does not form part of the DCO as it is deemed as associated development under Section 115 of the Act.

2.2.6 There are various instances and scenarios whereby the proposed pumped storage scheme could be utilised.

Black Start – a service paid for by the National Grid to assist in recovering power in the event of a large scale blackout.

STOR – Standing Operating Reserve – A service operated by National Grid to assist regulating supply and demand across the network.

Fast Response – A much faster version of STOR that responds within 2 minutes of notification and ramps up generation at >25MW per minute.

Frequency Response – A grid regulation service that operates within 2 seconds of instruction to help maintain grid frequency within set limits and aid grid stability.

Arbitrage – By soaking up power in off peak times, or when there is too much power on the grid, and generating at peak times, or when

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there is too little power on the grid; Pumped Hydro effectively reduces peak pressure and tops up demand troughs.

Demand Side Response – Where the facility is using electricity, it can quickly reduce its demand in response to a lack of power on the grid.

Avoided Curtailment – Where there is excess power on the grid, and National Grid seeks to reduce generation, it can instead call on storage to soak up excess supply. This will be increasingly beneficial as we install more and more renewable generation.

Portfolio Trading – An energy company or trading outfit can improve reliability and efficiency across its portfolio with the addition of a Pumped Hydro facility. Its traders can also trade in new ways knowing that they can manage excess power or under generation with their Pumped Hydro asset.

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3 Context Appraisal: Economic, Social, Physical & Policy

3.1 Preface

3.1.1 This section sets out the key headlines from an appraisal of the context to the Development. The appraisal considers the historic development of the site, its social and economic context, and its physical characteristics to identify the key issues that have informed the evolution of the design proposals for the Development. The section concludes with an overview of the relevant planning policy context to the Development, which is considered in detail in the Planning Statement which accompanies the application (Document Ref: 8.01).

3.2 Glyn Rhonwy: Site History

3.2.1 The Glyn Rhonwy and Chwarel Fawr quarries were first developed for open pit mining and slate quarrying, but this ceased prior to the Second World War. During the war, the MoD used part of the site for weapon and munitions storage. The site was eventually restored and all explosives and triggers were removed from the site following an extensive remediation process carried out by the MOD; and in 1998, Gwynedd Council (GC) began developing an industrial estate at the site to encourage occupation from employment based users.

3.2.2 QBC’s involvement in the site began in 2006 and following detailed engineering and design work, the planning application for the approved scheme was submitted to GC in 2012. Planning permission was granted in 2014 under the T&CPA, with a minor amendment being approved in 2015.

3.3 Social & Economic Context

3.3.1 The quarries represent a unique opportunity for electricity storage that is scarce in the UK as a whole. Currently, they are not being exploited as an asset. The Development accords with GC’s plans for the area, evidenced

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through the development of industrial estate platforms and the allocation of the site for redevelopment in local planning policy.

3.3.2 In terms of its economic profile, the surrounding area (principally Llanberis) is reliant heavily on public sector employment (Wales overall has a fairly heavily public sector driven economy) and the tourism industry. Siemens and Dinorwig Power Station are also significant regional employers. The surrounding hinterland has an array of holiday accommodation in the form of camping and caravan sites, as well as others. Llanberis itself has a large supply of hotels, bed & breakfasts and guesthouses. The majority of tourism in the area is based on outdoor activities such as watersports, walking/hiking opportunities, mountain biking and climbing; however a number of local visitor attractions exist, including Dinorwig and the mountain railway.

3.3.3 Notwithstanding the public sector and tourism dominance on the local economy, Dinorwig Power Station on the other side of Llanberis provides a significant amount of local employment. The establishment of an additional pumped storage facility has the potential to grow the sustainable energy industry in the area and further diversify the local economy. The clustering of industry is a well-established principle of economic development and both Dinorwig Power Station and SPH could benefit from potential knowledge spill overs and local transfer of ideas and innovation.

3.3.4 This DCO application is supported by a socio-economic impact assessment, which is incorporated in Chapter 15 of the Environmental Statement (Document Ref: 6.02). Of particular note, the development will create approximately 250 employment opportunities at the peak of the construction phase; and a further 20-35 throughout the entire 125 year operational lifespan of the development.

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3.4 Physical Context

Site

3.4.1 As previously stated, the site is located on the slopes of Cefn Du Mountain and largely comprises of disused slate quarries and surrounding woodland and heathland.

3.4.2 The Development site covers an area of land measuring 91.24 hectares and lies adjacent to Llyn Padarn, a glacially formed lake. The village of Llanberis is south-east of the Development site and represents the closest settlement.

3.4.3 Topographically, the site is extremely complex. The eastern most part of the Order Limits is within Llyn Padarn at 105m above sea level, while the remainder of the site varies drastically due to its mountainous location. Overall, the site slopes down from west to east; Q1 is at approximately 390m above sea level, while Q6 is around 150m above sea level. The site’s unique topography is what makes it suitable for a pumped storage facility.

Nature Conservation

3.4.4 There are several internationally or nationally designated nature conservation sites within a 2km radius of the Development site. This includes the Llyn Padarn Site of Special Scientific Interest (SSSI) (which covers a small area of the Order Limits) and four other SSSIs, two Special Areas of Conservation (SACs) and one National Park (NP). Within 10km of the Development site, there are two designated sites for bats, the Llyn Padarn SSSI and the Glynllifon SAC.

3.4.5 Accordingly, a Habitats Regulation Assessment (HRA) has been undertaken and is presented in the No Significant Effects Report (Document 5.03) submitted with the application. This is in line with the PINS guidance document: Advice Note Ten: Habitats Regulations Assessment relevant to nationally significant infrastructure projects (2013). The findings of the ecology assessment undertaken as part of the EIA for the Development is documented in Chapter 7 Ecology of the ES (Document Ref: 6.02).

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Landscape

3.4.6 There are a number of landscape designations within the vicinity of the application site. These include Snowdonia National Park, Rhosgadfan - Llanberis - Mynydd Llandygai Landscape Conservation Area, various Landscape Character Areas and sensitive LANDMAP Aspect Areas.

3.4.7 In view of these designations, Chapter 6 of the ES (Document Ref: 6.02) incorporates a Landscape and Visual Impact Assessment (LVIA), which has reviewed the impact of the proposals during the construction, operation and decommissioning stages of the Development. The photomontages prepared as part of the LVIA are included in Volume 4B of the ES (Document Ref: 6.04).

Heritage

3.4.8 There are no archaeological designations, listed buildings, scheduled ancient monuments or registered parks and gardens located within the site boundary, but several are located within close proximity to the Development and within the ES study area. These are shown on the plan included in Appendix C (also submitted with the DCO as Document Ref: 2.08).

3.4.9 An Archaeology and Cultural Heritage Assessment has been undertaken and forms part of the ES (Chapter 10) (Document Ref: 6.02) submitted in support of this DCO application.

3.4.10 A 1km study area was defined around the Development site for the purposes of the archaeology and cultural heritage assessment. Within this area, due to the historic nature of the landscape and locality, 329 heritage assets have been identified. These include one Scheduled Ancient Monument (SAM) and two Grade II Listed Buildings. In terms of archaeological potential, 93 assets have been recorded within or immediately adjacent to the Order Limits.

Movement

3.4.11 The route of construction traffic accessing the Development will vary for each part of the development site. Access to Q6 will be gained from existing

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industrial estate access roads, while access to Q1 will be gained via an unclassified road (known locally as the ‘Green Road’ or the ‘Llanberis- Waunfawr Mountain Road’) from the A4085 through Waunfawr and to a car park just south of the existing Q1 quarry. Highways improvements are required on this road which will be secured through a planning application to the LPA, submitted in conjunction with the application for a DCO.

3.4.12 Staff travel would be regulated by a Code of Construction Practice (CoCP) which would be agreed with Gwynedd Council under a DCO requirement prior to the commissioning and operational phase of the scheme.

3.4.13 An assessment of the traffic and transportation impacts of the Development is provided in ES Chapter 11 (Document Ref: 6.02).

3.5 Planning Policy Context

3.5.1 Planning policy of relevance to the Development exists at a number of levels.

3.5.2 National guidance comprises National Policy Statements, Planning Policy Wales Edition 7 (PPW) (July 2014), the Wales Spatial Plan (WSP) (July 2008), as well as a range of supplementary Technical Advice Notes (TANs). At the local level, the Gwynedd Unitary Development Plan (GUDP) (2009) constitutes the adopted development plan against which the proposals will be assessed. Policies of relevance in terms of both the national and local context are set out below.

National Policy Statements

3.5.3 The Act requires that any DCO application is decided in accordance with any relevant national planning policy statement, with certain exceptions. For this proposal, the relevant NPSs are outlined below:

NPS for Energy (EN – 1) (July 2011) – The overarching NPS relevant to this project; and

NPS for Renewable Energy Infrastructure (EN – 3) and NPS for Electricity Networks Infrastructure (EN – 5) – These are of some

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(limited) relevance, but do not represent key material considerations for decision making purposes.

Planning Policy Wales

3.5.4 PPW Edition 7 (July 2014) sets out the land use planning policies of the Welsh Government (WG). This contains guidance for the preparation of Local Authority’s development plans, development management, and sets out the WG commitment to achieving sustainable development.

Technical Advice Notes

3.5.5 PPW is supplemented by a series of Technical Advice Notes (TANs). A range of these apply to the Development, and their specific provisions are addressed through the technical chapters of the ES submitted in support of the planning application. Relevant TANs include:

Technical Advice Note 5: Nature Conservation and Planning

Technical Advice Note 8: Renewable Energy

Technical Advice Note 11: Noise

Technical Advice Note 12: Design

Technical Advice Note 14: Coastal Planning

Technical Advice Note 15: Development and Flood Risk

Technical Advice Note 18: Transport

Technical Advice Note 23: Economic Development

Wales Spatial Plan

3.5.6 The purpose of the Wales Spatial Plan is to ensure that what is done in the public, private and third sectors in Wales is integrated and sustainable, and that actions within an area support each other and jointly move towards a

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shared vision for Wales and for the different parts of Wales. The Spatial Plan area which the Development falls under is North West Wales.

Local Planning Policy

3.5.7 The Development site lies within the administrative area of Gwynedd Council (GC). The statutory development plan for the site, in accordance with Section 38 of the Planning and Compulsory Purchase Act 2004, is the Gwynedd Unitary Development Plan (GUDP). This was formally adopted in 2009.

3.5.8 Within the GUDP, the Development site is located in an area which has been classified as a Registered Historic Landscape with the western part of the Development also falling within a Landscape Conservation Area. The part of the Order Limits adjacent to Quarry 8 (Q8) (former WWII munitions store) is also part of a Landscape Conservation Area and the land at the very east of the site is within a Conservation Site of National Importance. The Development site lies outside the defined GUDP settlement limits with Q6 (Glyn Rhonwy) and Quarry 7 (Q7) (unnamed) (and their surrounding areas) falling within a defined redevelopment site and a dependency catchment area (where, under Policy C6, development proposals that will strengthen or diversify local economies will be approved provided they do not significantly harm the environment, the area’s cultural characteristics or the amenities of nearby residents).

3.5.9 The GUDP policies considered to be of relevance to the Development include the following:

Strategic Policies

Policy 1 – Taking a Precautionary Approach;

Policy 2 – The Natural Environment;

Policy 3 – Built and Historic Environment;

Policy 4 – Design Standards;

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Policy 5 – Developments which Create Risk ;

Policy 6 – Land Redevelopment and Reuse;

Policy 7 – Minerals;

Policy 9 – Energy;

Policy 11 - Accessibility;

Policy 16 – Employment.

Technical Planning Policies

Policy A1 - Environmental or Other Impact Assessments

Policy A3 - Precautionary Principle

Policy B7 - Sites of Archaeological Importance

Policy B10 - Protecting and Enhancing Landscape Conservation Areas

Policy B12 - Protecting Historic Landscapes, Parks and Gardens

Policy B14 - Protecting the Landscape Character of Snowdonia National Park

Policy B16 - Protecting Nationally Important Conservation Sites

Policy B20 - Species and their habitats that are Internationally and Nationally Important

Policy B21 - Wildlife Corridors, Habitat Linkages and Stepping Stones

Policy B28 - Unstable Land

Policy B29 - Development on Land at Risk from Flooding

Policy B30 - Contaminated Land or Buildings

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Policy B32 - Increasing Surface Water

Policy C1 - Locating New Development

Policy C3 - Re-using Previously Developed Sites

Policy C5 - Redevelopment Sites

Policy C6 - Glyn Rhonwy Redevelopment Site

Policy C7 - Building in a Sustainable Manner

Policy C27 - Renewable and Sustainable Energy Schemes

Policy C29 - Safeguarding Water Resources

Policy CH18 - Availability of Infrastructure

Policy CH22 - Cycling Network, Paths and Rights of Way

Policy CH25 - New Roads and Road Improvements

Policy CH33 - Safety on Roads and Streets

Policy CH34 - Rural Lanes

Supplementary Planning Guidance

3.5.10 GC has adopted a range of Supplementary Planning Guidance (SPG) documents which comprise detailed guidance on the way in which policies of the GUDP will be applied in particular circumstances or areas.

3.5.11 The following SPG documents are considered to be relevant to the determination of this DCO application:

x Gwynedd Local Planning Authority Supplementary Planning Guidance: Development Brief Caernarfon Dependency Catchment Area (2009);

x Glyn Rhonwy Development Plan and Implementation Strategy (2008).

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4 Design Proposals

4.1 Preface

4.1.1 This section of the statement takes forward the key findings of the appraisal of context and sets out the design principles established for the scheme that reflect NPS EN-1 and the Objectives of Good Design established by TAN12: Design. It examines the design evolution and considers how the context to the Development has informed the evolution of the design. These matters are addressed under the following key topics:

Access;

Character (including consideration of amount, layout, scale, appearance and landscaping);

Community Safety;

Environmental sustainability; and

Movement to, from, and within the development.

4.2 Development Design

4.2.1 Section 4.5 of NPS EN-1 refers to the need to apply good design to energy projects, which should produce sustainable infrastructure sensitive to place. However, Paragraph 4.5.1 does acknowledge that:

“…the nature of much energy infrastructure development will often limit the extent to which it can contribute to the enhancement of the quality of the area.”

4.2.2 Paragraph 4.5.2 goes on to discuss how good design is also a means by which many policy objectives in the NPS can be met. Good design can often be used to mitigate adverse impacts such as noise etc.

4.2.3 Paragraph 4.5.3 of NPS EN-1 states that the SoS will need to be satisfied that:

October 2015 24 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

“energy infrastructure developments are sustainable and, having regard to regulatory and other constraints, are as attractive, durable and adaptable (including taking account of natural hazards such as flooding) as they can be”.

4.2.4 The technical assessments that support the DCO application have assessed ‘maximum parameters’ within which the Development will be delivered. This strategy accords with the principles of the ‘Rochdale Envelope’, as identified in NPS EN-1, which allows an element of flexibility to be built into development proposals to address areas of uncertainty as proposals progress.

4.2.5 The ES has also considered the design process in detail and includes specific chapters that focus on the environmental matters associated with Development. These include:

Landscape Character and Visual Amenity(ES Chapter 6);

Ecology (ES Chapter 7);

Geology & Ground Conditions (ES Chapter 8);

Water Resources (ES Chapter 9);

Flood Risk (ES Chapter 10);

Archaeology & Cultural Heritage (ES Chapter 11);

Traffic & Transportation (ES Chapter 12);

Noise and Vibration (ES Chapter 13);

Air Quality (ES Chapter 14);

Socio-economics (ES Chapter 15); and

Environmental Management (ES Chapter 16).

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4.2.6 The cumulative impacts of the Development are presented in Chapter 17 of the ES, and a schedule of the mitigation measures proposed in included in the ES Chapter 18.

4.3 Consultation and Design

4.3.1 A significant level of consultation has taken place in connection with the evolution of the Development subject to the DCO. This commenced during the pre-application phase of the approved scheme and has continued since the grant of planning permission in the lead up to the submission of this DCO application. The consultation process has continually informed the Development design.

4.3.2 A full account of the pre-application consultation process is provided in the Consultation Report (Document Ref: 5.01) submitted with the DCO application.

4.3.3 Pre-application consultation for the Development was undertaken with GC, the Planning Inspectorate (PINS), and Natural Resources Wales (NRW) in December 2014 (which included a site visit attended by PINS) to outline the proposals and discuss the main technical considerations. Subsequent meetings have since been held with all of these organisations up to the submission of the DCO application.

4.3.4 Shortly after this, on the 6th January 2015, a Scoping Report was prepared and submitted to the Secretary of State (SoS) via PINS in support of a formal request by the Applicant under Regulation 8 of the Infrastructure Planning (Environmental Impact Assessment) Regulations 2009. Scoping is a non-compulsory preliminary task within the Environmental Impact Assessment (EIA) process. It provides a mechanism for consulting on, and agreeing the scope and approach to, the EIA. The SoS’s Scoping Opinion was issued on the 11th February 2015.

4.3.5 This was followed by an in-depth review of the preliminary information about the environmental effects of the Development, which was collated in the Draft Environmental Statement (prepared as Preliminary Environmental Information (PEI) for the purposes of consultation). This formed the basis of

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the statutory pre-application consultation, which was carried out between the 12th February and the 13th March 2015.

4.3.6 As part of the statutory consultation process, letters were issued to the list of bodies set out in Schedule 1 of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009. These were accompanied by the Draft ES (including a Non-Technical Summary (NTS)), a Consultation Overview Report of the scheme and a Consultation Feedback Form on the proposals. Neighbouring occupiers in the vicinity of the site were also consulted and provided with details of the proposed consultation exhibitions (two in total), which were advertised in the press and online. Inspection copies of materials from the exhibitions were made available at 5 publically accessible locations in the local area.

4.3.7 Feedback from the consultation exercise has helped shape the scope of the ES ensuring that key identified issues, such as visual impact, air quality and emissions and water abstraction and discharge have been comprehensively examined through the EIA process and the best options taken forward in terms of the design of the proposals.

4.4 Evolution of Development Design

4.4.1 In preparing the application for the approved 49.9MW scheme, and subsequently the DCO application, the applicant has engaged a specialist consultant team in a rigorous design process. This process investigated the potential offered by the quarry system at Glyn Rhonwy

4.4.2 The initial design evaluation identified 3 potential options for the configuration of the Development, and these are outlined in the table below.

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Table 4.1: Summary of Main Project Options

Option Key Features Advantages Disadvantages Conclusion Number

1 Use of Q1 and Shorter Stabilisation and Very complex Q2 as combined tunnel/penstock. access required engineering headpond. for Q1, Q2, Q5 solution required Power house in and Q6. to deliver. Q5. Q6 as Excavation under tailpond. and/or through Penstock to north existing spoil of quarry line. heaps. Dams at Q1, Q2 and Q6. Large dam at Q2. Power house location challenging to deliver.

2 Use of Q1 as Stabilisation Longer Lowest amount headpond with works at only penstock. Deep of risk from an Q6 as tailpond. two quarries. power house engineering Power house in Penstock avoids excavation perspective and platform existing spoil (although in a provides a adjacent to Q6. heaps. Use of controlled controlled Penstock to prepared environment). environment for south of quarry construction / the construction line. development of the power platform. house.

3 Use of Q1 as Stabilisation Longer penstock. The most headpond with works in only one Direct abstraction economically Llyn Padarn as quarry (as Q8 from Llyn Padarn viable option with tailpond. Power already with potential for the lowest level of house in former stabilised). environmental construction risk, bomb store (Q8). Negligible consequences. but has the Penstock to south operating range greatest potential of quarry line. on tailpond – also environmental direct access to impact on Llyn water source. Padarn. Higher available power.

4.4.3 Given the nature of the Development, the design has largely evolved as an ongoing balancing exercise between its environmental impact and the project’s overall deliverability. Once the broad configuration of the scheme was established, the design and arrangement of proposed buildings and structures has responded to the specific objectives of the development. The

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scale of the proposed buildings has been kept to a minimum, for both visual impact and cost reasons.

4.4.4 The design of the Development has evolved since initial dialogue with GC began prior to the submission of the T&CPA application. This dialogue with GC (and other stakeholders) has continued and informed further evolution of the Development to define the scheme subject to the DCO application.

4.4.5 The Development has evolved in two principal stages- the first for the approved scheme, and the second for the DCO. These two stages are intrinsically linked as the design of the approved scheme provided the basis for the design of the Development. The principal reason for the design evolution that took place following the grant of planning permission for the approved scheme related to the Electricity Market Reform, as a result of which it was clear that output capacity of 49.9MW was unlikely to be viable and, as such, that an increased capacity would be required.

4.4.6 Table 4.2 below identifies the review stages that occurred for both the approved scheme and the Development. This is followed by an overview of the stages of design review to demonstrate the scheme’s evolution. A more detailed account of the design evolution is provided in Chapter 3 of the submitted ES (Document Ref: 6.02).

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Table 4.2 Design Review Application Timing Design Review Review 1: Initial Design prepared for report November to accompany formal Scoping Request to 2011 Gwynedd Council Review 2: Engineering review following April 2012 T&CPA survey works Review 3: Review following stakeholder July 2012 consultation Review 4: Final design for planning August 2012 approval Determination of T&CPA Application – February 2014 December Review 5: Engineering Review to increase 2014 generating capacity to 99.9MW Review 6: Design Review for report to January 2015 accompany formal Scoping Request to DCO SoS February – Review 7: Engineering Review March 2015 Review 8: Final Design for DCO August 2015 application

Design Evolution: Approved Scheme

4.4.7 The approved scheme was subject to a four stage design review process prior to the submission of the T&CPA application.

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Approved Scheme - Review 1: Initial Design

4.4.8 The key features of the initial design were as follows:

based upon technical requirements of the pumped storage scheme together with development constraints including proximity to residential dwellings and designated sites;

incorporated three dams at Q1, Q2 and Q6;

penstock route located on the northern side of the scheme with an overland route outside the Cook (Q3) and Dhol (Q4) quarries to avoid protected breeding birds.

power house located Q5 accessed via the Glyn Rhonwy Industrial Estate platforms;

Llyn Padarn as a potential tailpond (this was discounted due to the potential impact on ecology and recreation.

4.4.9 The scheme at Design Review 1 is shown in Figure 3.5 below.

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Approved Scheme Review 2: Engineering review following survey works (April 2012)

4.4.10 The key changes at design review 2 were as follows:

removal of the dam at Q2 – due to the identified capacity of Q1 and a need for significant engineering and geotechnical stabilisation works at Q2 and Q5; and

power house relocated from the munitions store to Platform 5 of the Glyn Rhonwy Industrial Estate.

4.4.11 Two penstock / tailrace construction methods to transfer water from Q1 to Q6 were still being considered at this stage – one above ground and one below ground

4.4.12 The scheme at Design Review 2 is shown in Figure 3.6 below.

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Approved Scheme - Review 3: Review following stakeholder consultation (July 2012)

4.4.13 At this stage, it was determined that the penstock would likely be constructed by underground tunnel excavation. The route established at Design Review 2 would be used, albeit along a more direct underground route between Q1 and Q6.

4.4.14 The location of the spillway pipe from Q6 to Llyn Padarn was still subject to landownership discussions, specifically related to the bombstore (Q8). A location for the pumping station was identified at a small inlet adjacent to the public car park.

4.4.15 It was agreed that the excess material excavated from Q1 and Q6 would stay onsite and be landscaped into the existing spoil mounds at Q1.

4.4.16 The scheme at Design Review 3 is shown in Figure 3.7 below

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Approved Scheme - Review 4: Final design for planning approval (August 2012)

4.4.17 Prior to the submission of the T&CPA application, it was confirmed that tunnelling would be used to construct the underground penstock. In addition to this, the following key elements were confirmed for the approved scheme:

two dams were proposed - one at Q1 and a second at Q6;

the power house would be located on Platform 5 of the Glyn Rhonwy Industrial Estate;

the locations of the pumping station and spillway infrastructure;

the placement of excess materials to the south west of Q1 incorporating the existing slate mound.

4.4.18 The scheme at Design Review 4 (the approved scheme) is shown in Figure 3.8 below.

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4.4.19 Table 4.3 below sets out the key parameters of the approved scheme resulting from the design review process up to the submission of the T&CPA application.

Table 4.3 – Parameters of Approved Scheme

Area Description

Q1 Capacity – 1,100,000m3

Dam Height – 25m high

Dam Crest Level - 394m AOD

Top Water Level – 392m AOD

Lower Water Level – 342m AOD

Overflow Level – 393m AOD

Spillway – 400mm and 800mm discharge pipes

Q6 Capacity – 1,100,000m3

Dam Height – 15m high

Dam Crest Level - 156m AOD

Top Water Level – 154m AOD

Lower Water Level – 121m AOD

Overflow Level – 155m AOD

Spillway – 450mm intake and 800mm discharge

Penstock Length approximately 1500m

Diameter 4m

Excess Located south west of Q1

Spoil Mound Contains a maximum of 690,000m3

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Design Evolution: Development Consent Order

4.4.20 Following the grant of planning permission for the 49.9MW scheme, the Applicant moved into the implementation phase. However, changes to the capacity market introduced through the EMR necessitated a review of the scheme’s generating capacity. This review highlighted that an increased scheme output capacity would be required for the scheme to be delivered. A review of the approved scheme was undertaken to determine the increase in generating capacity required to improve deliverability. From this point, a further four stages in design evolution were undertaken to define the Development subject to the DCO application.

4.4.21 As the design evolution took the approved scheme as its baseline, this section identifies the stages in the design review process as a continuation of the design process for the approved scheme.

DCO Development - Review 5: Engineering Review (December 2014)

4.4.22 It was confirmed that the output capacity of the Development could be increased to 99.9MW without any substantial changes being made to the principal elements of the approved scheme. The main changes included:

More powerful turbines with a combined output capacity of 99.9MW located within the underground turbine hall (the turbine hall remained the same size as the approved scheme);

additional noise attenuation for the turbines was proposed (if required) to comply with any limits set by a DCO Requirement;

a minor increase in the number of construction based deliveries to bring the larger turbines and associated infrastructure on to site was predicted (at Q6 only), but the residual impact on the highway network would remain as per the approved scheme; and

the Development site remained at 59.3ha (as per the redline site boundary for the approved scheme).

4.4.23 None of the above changes affected the above ground scheme.

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DCO Development: Review 6: Design Review (January 2015)

4.4.24 This review was undertaken in advance of the submission of the formal request for a Scoping opinion from the SoS. The key change was an increase in the Development site area (the Order Limits) to 91.73ha. The reasons for this increase were as follows:

an allowance for construction activities connected with the new excess slate mounds and potential re-profiling of quarry walls);

additional land identified as replacement Common Land;

the penstock route was widened due to the potential for dolerite intrusions which may be present in this area.

Re-profiling of the northern edge of the Q6 dam to minimise landscape impact; and

additional areas were included for a potential replacement road to the power house, and to allow for flexibility in the location of the pumping station and its working area.

4.4.25 The scheme at Design Review 6 was included within the Draft ES used during the formal DCO consultation period. This is shown in Figure 3.9.

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DCO Development - Review 7: Engineering Review (February – March 2015)

4.4.26 Subsequent to the issue of the Draft ES (February 2015) for the statutory consultation process, a final review of the temporary and permanent PRoW diversions required in connection with the DCO was undertaken. In addition, further topographical surveys of the access route to Q1 (Green Road) and laser mapping of the Q1 and Q6 voids allowed a more extensive and accurate picture of the site’s topography to be prepared.

4.4.27 This identified a need to extend the Order Limits by approximately 6ha to a total of 97.77ha. This is shown in the figure below.

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DCO Development - Review 8: Final Design for DCO Application (August 2015)

4.4.28 Since the issue of the Draft ES in February 2015, a final series of further changes have been made to the Development design and the Order Limits. These have been made in response to comments received through the formal consultation process, and to also reflect a reduction in the extent of land take required for the DCO. Changes to the Development design have also occurred as a result of extensive mapping and data collection. The overall land area within the order limits was reduced to 91.24ha. Further details of the amendments made at this design review stage are provided below.

Increase in Storage Capacity - mapping of the quarry voids identified the potential to increase the storage capacity from 1,100,000m3 to up to 1,300,000m3. This increase in potential storage capacity does not materially change the proposed development as consulted on in February 2015. This will deliver an increase in energy generating capacity from 600MWh to up to approximately 800MWh, whilst the maximum output capacity remains at 99.9MW.

Changes to Material Volumes - detailed topographic and digital mapping survey identified that due to the presence of a number of geological intrusions below the surface of the water at Q6, up to approximately 650,000m3 of screened unsuitable material will need to be moved from Q6. All suitable virgin material excavated will be used for the construction of the Q6 dam, with the excess material being transported through the penstock by conveyor to be deposited within the proposed slate mounds at Q1. This will result in an increase in the volume of the slate mounds at Q1 from up to approximately 690,000m3 to up to approximately up to 935,000m3. The use of detailed terrain data has confirmed that there is sufficient space to accommodate this increase and the landscape and visual impact assessment has confirmed that there are no additional effects.

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Changes at Q6 and Pumping Station - to enable the construction of the potential bifurcation valve at Q6, a secondary temporary access shaft and access tunnel will be sunk to enable excavation. This will be in addition to the main turbine shaft and tailrace but will not be used during operation and so will be removed after construction. The pumping station has been relocated to be further away from Llyn Padarn (in an area of vegetation adjacent to the main car park). A secondary alternative location is also being investigated and is subject to ongoing discussions with utility companies regarding easements. This alternative location is immediately adjacent to the toilet block in front of the access to the bombstore.

4.4.29 The scheme at Design Review 8 (the Development subject to the DCO application) is shown in Figure 3.11.

4.4.30 The ‘Development Overview’ plan in Appendix D to this statement illustrates the principal components of the Development subject to the DCO.

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4.4.31 Table 4.4 below sets out the key parameters of the Development subject to the DCO application.

Table 4.4 – Development Parameters Area Description Q1 Maximum elevation of dam of 395m AOD to crest Plan width 150m and length 371m Max volume of 1,300,000m3 Max water level 392m AOD Excess Spoils Max combined volume of 935,000m3 Mounds Penstock To be tunnelled within 114m buffer and between a maximum elevation of 330m AOD to a minimum depth of 55m AOD Up to 1600m long within Order Limits (plan length) but potentially up to 1800m to allow for any underground deviations, and 4.5m internal diameter Tailrace Up to 160m long Tailrace, 4.5m internal diameter Q6 Maximum elevation of 156m AOD Plan width 95m and length 210m Max volume of 1,300,000m3 Max water level 154m AOD Power House 15m high to apex x 27m wide x 60m long Turbine Hall Two underground turbines with maximum electrical output of up to 99.9MW Volume of excavation approximately 100,000m3 Switchgear 10m high to apex x 18m wide x 30m long Transformer 7m wide x 7m long x Assumed to be 10m high GIS Substation 12m high to apex x 12m wide x 30m long Gas Insulated Pumping 1.6m high x 2m long x up to 0.8m deep Station

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4.4.32 The evolution of the Development design following the gram of planning permission for the approved scheme including the following:

Increase of output capacity from 49.9MW to 99.9MW due to increase in turbine size and associated infrastructure;

Additional noise attenuation for the turbines (if required);

Minor increase in construction based deliveries to Q6;

An increase in the extent of the Order Limits from 59.3ha to 91.24ha, primarily to allow for construction activities associated with new excess slate mounds and the excavation methods required to construct the penstock;

Reprofiling of Q6 dam to mimic the rolling nature of existing slate mounds;

Amendments to PRoW diversions and additional extent to diversions in the far west of the Order Limits to encompass informal routes;

Amendments to location and extent of replacement Common Land and CRoW land.

Inclusion of part of the unnamed road (known locally as the Green Road) and replacement car park (for users of Cefn Du and the PRoW) within the Order Limits at Q1;

Increase in storage capacity from 1,100,000m3 to up to 1,300,000m3 following additional survey work in Q1 and Q6,

Increase in slate mounds from up to approximately 690,000m3 to up to approximately up to 935,000m3;

The inclusion of an additional access shaft and tunnel in order to construct a bifurcation valve; and

Relocation of the pumping station further from Llyn Padarn, as well as the inclusion of flexibility over a potential alternative location currently being investigated.

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4.4.33 None of the scheme elements above have resulted in any significant additional residual impact to the site and its surrounds from that identified in the ES for the approved scheme. The design parameters of the Development are considered to be acceptable, particularly when taking into consideration the historic industrial landscape of the Development site. To this end, the proposal is considered to comply with the design requirements of NPS EN-1. The wireline photomontage included below is a view of the Development looking north (Document Ref: 6.04, Figure 7.47c).

4.5 Design Principles

Access

4.5.1 Changes in the approach to the design of buildings to be ‘inclusive’ has developed over many years, culminating in the Disability Discrimination Act 1994 (DDA) and subsequently, the Equality Act 2010. Additionally, significant changes were made to Part M of the Building Regulations in May 2004 to ensure that work carried out provided for inclusive design.

4.5.2 The Development will meet the duties required by the current statutory legislation.

4.5.3 Means of escape in case of fire will be focused primarily on the detailed layout of the interior of the buildings. Suitable escape detailing will be incorporated to ensure the needs of disabled people are accommodated where necessary.

4.5.4 In terms of vehicular access, this will be provided separately for each part of the site. Access to Q6 will be gained from the A4086 via existing Glyn Rhonwy Industrial Estate access roads, while access to Q1 will be gained

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via an unclassified road (known locally as the Green Road) from the A4085 through Waunfawr and to a car park just south of the existing Q1 quarry. There will be no alternative access to the Development. Once complete, access to the quarries and open land will be restricted as it is currently (i.e. by stock proof fencing) with access being restricted to the power house due to the nature of its use and operation.

4.5.5 The pumped storage facility will create a need for staff to be onsite 24 hours a day for operational and security reasons. The Development will operate continuously through its lifespan with the exception of maintenance.

Character

4.5.6 The Development site sits on the slopes of Cefn Du mountain, which is characterised by its historic landscapes centred on the slate quarrying industry.

4.5.7 The land within the Order Limits comprises several disused quarry pits and slate tips, as well as land in between and surrounding the quarries which includes woodland, grazing land and the industrial estate platform at Glyn Rhonwy. The site has a complex topography which heavily influences its character; this is due to its mountain location and the slate tips which visually dominate the site.

4.5.8 The slopes around the quarries are built up with slate waste and interspersed with the remains of outhouses and quarry workings, scattered over steep grazing land. The neighbouring land is mainly agricultural, although there is an industrial estate between Glyn Rhonwy and Llyn Padarn, and a large industrial complex occupied by Siemens to the south of the Development site towards Llanberis.

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4.5.9 The wider area is mountainous and rural in character, with several lakes surrounding the various peaks. There are a series of small dispersed settlements around Snowdon, with Llanberis being one of the larger villages in the region with a good supply of services and facilities for both residents and visitors.

4.5.10 Chapter 6 (Landscape and Visual) of the ES identifies the key landscape sensitive receptors and evaluates the impacts of the Development on the landscape character of the surrounding area. In view of the highly industrialised historic use of the landscape, the sensitivity of the site to a change of the type proposed is high, but the magnitude of change will be low.

Use & Amount

4.5.11 The Order limits extend to some 91.24 hectares, covering various different areas of land. At the south-west end of the Order Limits is Q1 and the surrounding area, which is mostly disused quarries and slate tips, but also includes some common land in the form of heathland and some forestry to the south. The mid-section of the Order Limits, between Q1 and Q6, consists of grazing land at the western end and slate tips at the eastern end. The north-east end of the Order Limits is characterised by Q6 and its surrounding area, which is predominantly disused quarries (3 quarries are entirely within the Order Limits, with a further 4 being partially within the Order Limits) and slate tips, but also includes part of the industrial estate platform and woodland adjacent to Llyn Padarn.

4.5.12 The main elements of the proposal have been outlined in Section 2.2 (Overview of the Development) of this statement. Further details are included within Chapter 4 (Project Description) of the ES (Document Ref: 6.02).

Layout

4.5.13 The indicative site layout and arrangement of plant, equipment and buildings associated with the Development is shown on the illustrative plans (Document Ref: 2.05) submitted in support of this DCO application. Extracts

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of the headpond and tailpond layout plans are included below and ‘not to scale’ versions of the illustrative layout plans are included in Appendix E to this statement.

4.5.14 Aside from the creation of reservoirs and the construction of dams, the majority of the above-ground development will be in the form of the power

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house compound. An extract of the layout of this compound, which will be located adjacent to Q6, is provided below. This consists of a main hall and shaft to the underground part of the compound, a switchgear room, two transformers, a substation building, a control room, staff facilities, power supply and other small ancillary rooms.

4.5.15 The turbines and generator will be situated approximately 70m beneath the main hall within the power house compound, along with the penstock inlet valve and the tailrace tunnel.

4.5.16 In addition to the power house compound, there will be other buildings and structures across the site. In the area surrounding Q1, these will include spoil heaps where excess material from earthworks will be stored; a dam which allows the reservoir to be created at Q1; a public car park adjacent to the dam, and a scour/overflow tower to enable water to be discharged from the pumped storage system in the case of an emergency.

4.5.17 In the area surrounding Q6, the additional buildings and structures will include a dam which allows the reservoir to be created; a retaining wall to provide support for the power house buildings, and a scour/overflow and rising main combined tower, which provides an inlet/outlet main from Llyn

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Padarn and an overflow intake marginally above the maximum water level. As the drawings are indicative, the draft DCO includes a requirement that plans showing the layout of the Development must be submitted to and approved by the relevant planning authority before development commences.

4.5.18 Much of the Development will take place underground. A temporary access tunnel and shaft are required for use during the construction of the underground aspects of the development, but will remain in situ in order to access certain parts of the development for maintenance purposes. The permanent underground aspects include a penstock (a pipe approximately 4.5m in width) travelling from beneath Q1 to the turbines beneath the power house; a tailrace (approximately the same width) travelling from beneath the power house to the base of Q6; the underground development beneath the power house, including a cable shaft and gantry crane; and pumping house for extraction (including a control box with dimensions 2m x 2m x 1m) or outlet of water from Llyn Padarn, which will be marginally below ground level and covered with a grid.

4.5.19 As associated development outside of the Order Limits, the likely 132kV connection will be secured with SP Manweb through the appropriate consenting regime. The connection point is at Pentir, approximately 7km from the development site.

4.5.20 Highway improvements required outside of the Order Limits to facilitate access to Q1 will be secured through a planning application to GC, which will be submitted in conjunction with the application for a DCO.

Appearance

4.5.21 The need for ‘good design’ is reinforced in national planning policy including the Overarching National Policy Statement for Energy (NPS EN-1) which seeks to ensure that energy infrastructure developments are “as attractive…as they can be”. NPS EN-1 goes on to state that:

“whilst the applicant may not have any or very limited choice in the physical appearance of some energy

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infrastructure, there may be opportunities for the applicant to demonstrate good design in terms of siting relative to existing landscape character, landform and vegetation”.

4.5.22 The main power house building will be up to 15m in height and will be the largest building within this compound. All buildings will have a natural slate roof and natural slate stonework walls. The plan extract below provides an indicative elevation of the power house compound (taken from Document Ref: 2.06) and the proposed elevation of the main building. Appendix F to this statement includes ‘not to scale’ versions of the indicative elevations, sections and floorplans submitted as Document Ref: 2.06). The draft DCO includes a requirement that details of the design, external appearance and surface finishes are submitted to and approved by the relevant planning authority before development commences.

4.5.23 The dams will be constructed using waste formed through the various excavations which will take place. Using existing materials has the benefit of reducing the visual prominence of the dams and incorporating them into the landscape. Site-won materials will also be used for the creation of access tracks and the platform for the construction compound. A Materials Management Plan (MMP) will be developed by the Contractor during the detailed design phase and will be implemented during construction. This will be subject to approval by GC as a DCO requirement (in consultation with NRW).

4.5.24 The photomontage included below demonstrates how the Development will appear from the other side of Llyn Padarn, looking south-west (the full scale

October 2015 49 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

version of this is included within the Appendix to the ES, Document Ref: 6.04, Figure 7.49c).

4.5.25 External security and functional lighting will be required as an integral part of the Development. Security fencing and lighting will be installed around the two working areas at Q1 and Q6. The lighting will be likely to comprise column mounted, downward orientated lights and best practice guidance will be followed with regard to their use.

4.5.26 The specific detailed design of all aspects of the Development will require approval by the LPA via a DCO Requirement. All drawings submitted with the DCO are indicative and do not represent the final design.

Scale

4.5.27 In terms of the scale of the Development, Table 4.4. (earlier in this chapter) provides the maximum physical dimensions of the main application components.

4.5.28 Aside from the dams at Q1 and Q6, which will have a crest height of 395m AOD and 156m AOD respectively, the tallest built component proposed on the site will be the power house (up to 15m in height).

4.5.29 The ES (Chapter 7 Landscape and Visual) provides further information on the proposed buildings/components and incorporates an assessment of their visual impact, together with worst-case scenario photomontages (included in ES Vol. 4 – Document Ref: 6.04).

Landscaping

4.5.30 Due to the nature of the development, there will be a minimal requirement for traditional landscaping measures as extensive planting around proposed buildings and structures is not appropriate or necessary; dams must be kept clear and visible in the interest of reservoir safety. However, the spoil mounds have been designed to encourage natural re-colonisation of vegetation where practical to soften their appearance, reduce erosion and encourage biodiversity.

October 2015 50 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

4.5.31 The draft DCO includes a requirement for a landscaping scheme to be submitted to and approved by GC before development commences. There will be a need for some landscape works in certain areas of the site.

4.5.32 As well as disused quarries and slate tips, the Order Limits consist of heathland, grazing land and woodland. Therefore, appropriate ecological survey work has been undertaken in order to ensure that the development can take place without resulting in significant harm to features of acknowledged importance.

Community Safety

4.5.33 This DCO application proposes the development of a pumped storage facility that is intended to be as safe and secure as possible with all opportunities for crime designed out. This will ensure that health and safety concerns are minimal and the site operators can maintain a fully operational and secure business devoid of crime, insecurity and safety concerns.

4.5.34 Over recent years, there have been instances of forced access to the site, to the danger of those involved. The development of a fully operational pumped storage facility will have the added benefit of 24 hour onsite presence of staff and significantly enhanced security features. The opportunity for crime and disorder will be minimal and heavily controlled through security surveillance and the erection of secure fencing around the working areas of the site, including the power house, Q1 and Q6.

4.5.35 There will be no public access to the site. Nevertheless, the health and safety of everyone involved in the construction, operation and decommissioning of the Development is of paramount importance and has been fully considered throughout the evolution of the project.

4.5.36 On-site health and safety is largely governed by separate legislation and will be strictly adhered to by the site operators. The proposal is not considered to give rise to any additional community safety or crime prevention issues that would warrant the refusal of this DCO.

October 2015 51 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

Environmental Sustainability

4.5.37 This DCO application proposes the development of a new hydro-electric pumped storage facility largely developed on previously developed land, which makes effective use of the quarries on the slopes of Cefn Du Mountain as an asset. It is the intention of the Applicant that the Development is designed sustainably and this will be important consideration of the overall development.

4.5.38 The following environmental features were key considerations in the design of the scheme:

Private water supplies

Proximity of National Park and other scenic areas

Historic interest in slate mining

Water Quality in Llyn Padarn SSSI

High amenity and ecological value of Llyn Padarn

Ecological interest in the former quarry sites (nesting birds, lichens and bryophytes)

Tourism and recreational interest in the locality

Local road network

Previous use of quarry complex for storing and disposing of munitions.

4.5.39 The design evolution of the development has fully addressed a wide range of important environmental factors which are discussed in further detail in the submitted ES (Document Ref: 6.02).

4.5.40 Whilst the environmental features identified above have all been taken into consideration when designing the scheme, the quarries at Glyn Rhonwy represent a unique opportunity for electricity storage which is scarce across

October 2015 52 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

the UK as a whole. It is a technology that will make an important contribution to the balancing of the demand for electricity and the intermittency of supply caused by renewable energy generation.

4.5.41 The facility can be turned on and off very quickly in order to meet urgent demands for electricity at peak times during the day. Combined with similar existing and forthcoming facilities, the Development will enable a significant reduction in the UK’s CO2 emissions as it will support increased renewable energy capacity, which is only made possible through ‘balancing technologies’ such as electricity storage. Whilst the facility will require electricity in order to pump the water from the tailpond to the headpond, this will usually be undertaken during the night when there is surplus in the national grid.

4.5.42 The development is considered to be environmentally sustainable as it represents an appropriate location for a technology which will help to drive the UK towards increased renewable energy generation and reduced CO2 emissions. Moreover, the ES has fully considered all environmental impacts the development may have and has proposed mitigation measures accordingly.

Movement to, from and within the Development

4.5.43 There are 3 highways crossing the Order Limits; the A4086, Fford Clegir and an unnamed road (known locally as ‘the Green Road’ or the ‘Llanberis- Waunfawr Mountain Road’). Additionally, there are footpaths, cycleways and PROWs. Access to the area from the east is primarily via the A4086, while access form the west is primarily via the A4085. The highway network in this part of Wales is primarily single carriageway; however the dual carriageway North Wales Expressway does link the region to north-west England.

4.5.44 As the proposed drawings demonstrate, access to the development will be gained separately for each part of the site. Access to Q6 will be gained via existing Glyn Rhonwy industrial estate access roads, while access to Q1 will be gained via the unclassified road (known locally as the ‘Green Road’) from

October 2015 53 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

the A4085 through Waunfawr and to a car park just south of the existing Q1 quarry. This would deliver a safe, secure and effective access arrangement into the site, allowing for ease of movement for staff and operational vehicles.

4.5.45 Operational phase traffic movements will be restricted to staff travel and delivery of ancillary materials. 20-35 staff will be required during the operational lifespan of the development. The local highway network can suitably accommodate this (although some road upgrades are required as part of the construction phase).

4.5.46 Clear signage will be provided within the Development to assist all users.

October 2015 54 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

5 Conclusion

5.1.1 This Design & Access Statement has been prepared by Bilfinger GVA on behalf of SPH in support of a DCO application for a scheme that proposes a hydro-electric pumped storage facility at the Glyn Rhonwy and Chwarel Fawr quarries near Llanberis in North Wales.

5.1.2 This Statement has been prepared in line with the guidance provided in TAN 12 (Design) and in accordance with Section 4.5 of NPS EN-1, which requires good design in energy infrastructure. Good design is an important factor in power generation development and the guidance provided in TAN 12 is considered pertinent to this DCO application as Section 104 (2)(d) of the Act states that the Secretary of State will regard Welsh policy and guidance as important and relevant.

5.1.3 Three main options for the configuration of the pumped storage facility were considered as part of the design process, and the design evolved through eight review stages in connection with the approved 49.9MW scheme and then the 99.9MW DCO Development. The design of the Development has been informed by consultation with the public and statutory consultees, influences on the economic viability of the development and on-going investigation and feasibility works required to ensure the scheme is environmentally acceptable.

5.1.4 This Statement has identified the following key benefits of the development through the context appraisal and the assessment of design and access considerations:

Several design options were considered and the best all-round option taken forward in the DCO application;

The development will provide economic benefits through employment opportunities, local interest and the clustering of industry;

October 2015 55 The Glyn Rhonwy Pumped Storage Order Design & Access Statement 8.03

Local concerns have been responded to in various ways, including altering the scope of the ES, the location of the pumping station and amending PRoW diversions;

The re-use of site-won materials in the construction of dams will ensure that the development has a minimised impact on a highly sensitive landscape;

Much of the Development is below ground and therefore visually unobtrusive;

All appropriate environmental surveys have been undertaken and the impacts have been found to be acceptable; and

Technologies such as pumped storage will allow the intermittency of renewable energy generation to be countered and assist in essential balancing of the electricity distribution network.

5.1.5 The Development presents a unique opportunity to make effective use of a currently underutilised asset. The Development has been carefully designed and configured in order to take advantage of the site as a resource, whilst having an acceptable impact on environmental features and assets, and in doing so, making a valuable contribution to the UK’s transition towards a low-carbon economy.

October 2015 56 Appendix Appendix A – Site Location Plan This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Ü

KEY: GF Site Location

0 10,000 Metres

Client: Project: Drawn: LC Checked: LC GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: SC Approved: CA Title: 1 Callaghan Square T +44 (0)29 2067 4600 Date: AUGUST 2015 Scale at A3: 1:250,000 FIGURE 1.1 - LOCATION PLAN Cardiff F +44 (0)29 2067 4699 CF10 5BT www.aecom.com Drawing Number: GR_150803_1.1_v4 A3 © Crown copyright, All rights reserved. 2012 Licence number 0100031673 Appendix B – DCO Order Limits This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Ü

Q8 ^_ Q7 Q6 ^_ ^_

Q5 ^_ Q4 ^_ Q3 ^_ Q3a ^_

Q2 ^_

Q1 ^_

KEY: Order Limits ^_ Quarry Locations

0 500 Metres

Client: Project: Drawn: LC Checked: LC GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: SC Approved: CA Title: 1 Callaghan Square T +44 (0)29 2067 4600 Date: AUGUST 2015 Scale at A3: 1:10,000 FIGURE 1.2 - ORDER LIMITS Cardiff F +44 (0)29 2067 4699 CF10 5BT www.aecom.com Drawing Number: GR_150819_1.2_v6 A3 © Crown copyright, All rights reserved. 2012 Licence number 0100031673 Appendix C – Historic Environment Features This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client.

Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. E 48 204 ! !

227 ! Ü

309 267 1 ! ! 235 45 175 ! ! ! ! ! 260 10 228 !

174 ! 245 234 ! 3 ! 236 205 259 ! ! 315 2 312 ! !! 308 305 272 273 ! ! ! ! ! ! ! 322 ! 46 85 285 ! ! ! 304 53 313 !! ! 239 253 ! 105 61 321 ! 301 ! ! 51 ! 320 82 302 ! 314 ! ! 81 ! 80 ! ! ! 229 ! 176 329 ! 104 84 306 ! 303 107 90 ! ! ! ! 108 101 98 ! 56 ! ! 103 ! ! ! ! ! 83 185 226 91 ! ! ! 307 ! 319 E 97 ! ! 89 ! 241 ! ! 94 ! 79 102 ! 62 177 93 60 92 100 ! ! ! ! ! 67 99 ! 141 238 ! ! ! 86 18E 3 240 310 242 258 256 59 65 ! 180 ! ! ! ! ! ! ! ! ! 280 95 128 127 184 179 181 213 87 ! !

69 64 178 !

! 70 96 ! 88 ! 138 E E 237

! 77 63 140 123 ! !! ! 274 ! 130 ! 182 E ! 73 ! ! !!! ! ! 121 ! 124 ! ! 133 216 E ! 225 223 ! ! 78 ! ! ! 311 68 ! ! 208 ! ! 209 ! 268 72 66 58 54 ! 129 ! 219 207 !

! ! 134 122 ! ! ! ! 76 136 ! E ! !

E 222 ! ! ! E 244 ! ! 118 125 1E 39 ! E 210 55 !E ! ! 211 52 290 74 71 131 220 ! ! 57 317 137 132 ! 119 221 ! ! 75 ! ! ! 120 113 ! ! ! 135 263 217 ! 215 106 ! 262 ! 115 160 325 126 212 ! 224 ! 12 ! ! ! ! ! ! 257 318 ! 328 ! !

149 169 249 161 133 ! 218 214 ! E 7 ! ! 261 ! 289 154 250 ! ! 327 !E ! ! ! 142 ! ! ! 117 ! 254 ! ! ! 247 264 ! 266 145 ! 168 ! 50 ! !! 326 E 11 13 ! 150 ! 316 6 116 195 ! ! 246 324 8 5 111 4 191 ! 255 265 144 162 ! 248 ! E ! ! ! 156 153 ! ! 294 146 ! !

158 281 165 110 293 297

! ! 166 ! 296 ! ! E 163 ! 323 !! 198 ! ! 36 ! ! !! 190 43 148 ! 39 112 ! ! ! ! 49 299 164 ! 155 31 34 ! 295 ! !! 193 ! ! 37 292 298 ! ! ! 197 ! ! ! ! 32 !! ! 114 !! ! ! ! ! 167 ! ! 194 271 ! ! ! 291 ! 38 188 ! 251 ! ! 283 ! 33 40 47 109 ! 196 ! ! 147 ! ! 15 ! 23 269 192 !!! ! ! 143 159 ! 30 9 173 41 ! 187 151 ! ! 157 275 35 189 ! 25 ! 152 270 199 ! 186 201 172 170 28 16 21 ! ! ! 202 284 ! 27 ! 277 171 ! 44 42 14 20 ! ! 18 29 ! ! 203 22 ! 19 KEY: 200 ! Order Limits ! Scheduled Monument 17 233 ! ! ! Listed Building 26 230 ! !

! 231 Known Archaeology ! 24 E ! E Known Archaeology - Linear ! 0 500 Metres 232

Client: Project: Drawn: LC Checked: LC GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: JS Approved: CA Title: 1 Callaghan Square T +44 (0)29 2067 4600 Date: AUGUST 2015 Scale at A3: 1:12,500 FIGURE 11.1 - KNOWN ARCHAEOLOGY Cardiff F +44 (0)29 2067 4699 CF10 5BT www.aecom.com Drawing Number: GR_150828_11.1_v5 A3 © Crown copyright, All rights reserved. 2012 Licence number 0100031673 Appendix D – Development Overview This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Ü

^_ ^_ Q8 ^_ Q7 Q6 ^_ ^_

Q5 ^_ Q4 ^_ Q3 ^_Q3a ^_

Q2 ^_

KEY: Q1 ^_ Order Limits ^_ Quarry Location ^_ Proposed Pumping Station ^_ Alternative Pumping Station Spillway Infrastructure Penstock Temporary Tunnel and Access Shaft Tailrace Temporary Construction Compound

Dam Footprint Reservoir Edge Excess Slate Mound Q1 Permanent Public Car Park

Q1 Temporary Public Car Park Power House Power House Compound

0 500 Metres

Client: Project: Drawn: LC Checked: LC GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: SC Approved: CA Title: 1 Callaghan Square T +44 (0)29 2067 4600 Date: OCTOBER 2015 Scale at A3: 1:10,000 FIGURE 4.1 - DEVELOPMENT OVERVIEW Cardiff F +44 (0)29 2067 4699 CF10 5BT www.aecom.com Drawing Number: GR_151001_4.1_v8 A3 © Crown copyright, All rights reserved. 2012 Licence number 0100031673 Appendix E – Indicative Layout Plans This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. N 441m Cefn Du

Track Path (um) Path (um)

PENSTOCK INLET/OUTLET SHAFT Workings (dis)

ED Bdy Pen-y-bwlch Quarry Und Path (dis) Tips (dis)

Trial Level HEAD PONDPond COMBINED RELIEF Track Sheepfolds VALVE/OVERFLOW (disused)TOWER Dismantled Tramway Path FW

Water Path Pond 3HQ\IIUvGG Chwarel Fawr Tramway Sheepfold (Disused Quarry) Trial Path Dismantled Level Bwlch-y-groes

Tips DAM (disused) Bryn-mawr Quarry Tip Pond (dis) (dis) El P

SPOILNEW Und HEAPSLATE MOUND Tip El P NEW SLATE (dis) MOUND SPILLWAY INFRASTRUCTURE El P TO NANT Y BETWS Level Nant y Betws (dis) Tip (disused) El P Trial Level 'RQHQ/kV El P Pond 'RQHQ/kV F Path El P

E Tip Pond Sheepfold (dis) El P LEGEND NOTES D ETL Quarry 1. ALL DIMENSIONS IN METERS UNLESS Nant y Betws ORDER LIMITS (disused)OTHERWISE NOTED. DO NOT SCALE. C EXTENTS OF EARTHWORKS 2. ALL LEVELS IN METRES AND REDUCED TO El P ORDNANCE DATUM UNLESS OTHERWISE NOTED. MAX. OPERATIONAL WATER LEVEL 3. CONTOURS AT 5 METER INTERVALS. EXTENTS OF RE-PROFILING 4. SECTION OF SPOIL MOUNDS SEE FIGURE El P 2.06.3. Trial PERMANENTLevels DIVERSION Drain NEW DAM OPERATIONAL ACCESS 0 50 100 TRACK m El P PERMANENT REPLACEMENT PUBLIC 1:2000 CARPARK

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:2000 Figure 4.2 Indicative Site Layout Plan of Q1 Configuration Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.2 A1 2UGQDQFH6XUYH\&URZQ&RS\ULJKW$OOULJKWVUHVHUYHG/LFHQFHQXPEHU (Path & Cycle Track)

This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Padarn Fn N Lodge Path (um) Glyn Peris 127.7m

Glyn Padarn Glyn Peris Cottage A 4086

Well

Path (um)

Issues Tip Tip Glyn-rhonwy Slate Quarry (disused)

COMBINED OVERFLOW/ SCOUR/RISING MAIN TOWER

DAM

Glyn-rhonwy Slate Quarry (disused)

RETAINING WALL

TAIL POND

Pond

Incline (disused) Issues

TEMPORARY ACCESS TUNNEL Reservoir

Heap (dis)

LEGEND Cae'r-ty GLYN RHONWY POWER Pond ORDER LIMITS HOUSE COMPOUND EXTENTS OF EARTHWORKS Tip MAX. OPERATIONAL WATER LEVEL (disused) TEMPORARY TUNNEL ACCESS EXTENTS OF RE-PROFILING SHAFT

NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METRES AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED. Track 3. CONTOURS AT 5 METER INTERVALS.

Issues 0 25 50 m 1:1000

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Afon Giyn Date: 07.08.15 Scale at A1: 1:1000 Figure 4.5 Indicative Site Layout Plan of Power House, Tailrace and Q6 Configuration Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.5 A1 2UGQDQFH6XUYH\&URZQ&RS\ULJKW$OOULJKWVUHVHUYHG/LFHQFHQXPEHU This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. N

LEGEND

ORDER LIMITS

EXTENTS OF EARTHWORKS

MAX. OPERATIONAL WATER LEVEL

EXTENTS OF RE-PROFILING

TFA UNIT STARTUP TRANSFORMER A

TFB UNIT STARTUP TRANSFORMER B

AUX TF AUXILIARY TRANSFORMER

NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METERS AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED. 3. CONTOURS AT 5 METER INTERVALS. 4. ALL BUILDINGS DETAILS ARE INDICATIVE AND SUBJECT TO ARCHITECTURAL DETAILED DESIGN AND APPROVAL VIA DCO REQUIREMENTS 5. GIS SUBSTATION BUILDING DESIGN IS SUBJECT TO APPROVAL BY SP MANWEB

0 6.25 12.5 m 1:250

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:250 Figure 4.9 Indicative Site Layout Plan of Above Ground Power House, Substation and Ancillary Buildings Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.9 A1 2UGQDQFH6XUYH\&URZQ&RS\ULJKW$OOULJKWVUHVHUYHG/LFHQFHQXPEHU This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. N

C Lake

ED Bdy

Boat House

Lay-by Path (um)

132.7m Gwel Llyn 130.1m (Hotel) INLET/OUTLET FB

Lon Las Peris 128.9m (Path & Cycle Track)

Pen-gilfach Glyn Padarn Fn Lodge Path (um) Glyn Peris 127.7m

Glyn Padarn PUMPING STATION LOCATION Glyn Peris Car Park Cottage A 4086 Y Glyn ALTERNATIVE PUMPING STATION LOCATION

SM INDICATIVE ROUTE OF SPILLWAY INFRASTRUCTURE (BURIED) PC

Track

Lon Las Peris Tip Tip Glyn-rhonwy (Path & Cycle Track) Q8 Slate Quarry (disused) A 4086 Factory

(Path and Cycle Path)

COMBINED OVERFLOW/ Lon Las Peris SCOUR/RISING MAIN TOWER MAXIMUM OPERATIONAL WATER LEVEL DAM

Gallt-y-glyn

Track

Glyn Q7 Rhonwy

1 Car Park 2 Glan Llyn 5

RETAINING WALL LEGEND YSTAD Ponds Drain TAIL POND 1 ORDER LIMITS

DDIWYDIANNOL Shelter EXTENTS OF EARTHWORKS Gwaithdai Cymunedol TAILRACE INLET/OUTLET (Community Workshops) MAX. OPERATIONAL WATER LEVEL Pond Drain EXTENTSTCP OF RE-PROFILING

KMP Y GLYN INDICATIVE OVERFLOW/SCOUR PIPE TAIL POND Drain

NOTES

TAILRACE 1. ALL DIMENSIONS IN METERS UNLESS

OTHERWISE NOTED. DO NOT SCALE. TAIL RACE TUNNEL RACE TAIL 2. ALL LEVELS IN METRES AND REDUCED TO Issues ORDNANCE DATUM UNLESS OTHERWISE NOTED. 105.1m 3. CONTOURS AT 5 METER INTERVALS. El

TEMPORARY ACCESS TUNNEL Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:1000 Figure 4.12 Indicative Site Layout Plan of Q6, Pumping Station and Spillway Infrastructure Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.12 A1 2UGQDQFH6XUYH\&URZQ&RS\ULJKW$OOULJKWVUHVHUYHG/LFHQFHQXPEHU Appendix F – Indicative Sections & Elevations This documenthasbeenpreparedbyAECOMforthesoleuseofourClient(the"Client")andinaccordancewithgenerallyacceptedconsultancyprinciples,budgetfeestermsreferenceagreedbetweenClient.AnyinformationprovidedthirdpartiesreferredtohereinnotcheckedorverifiedAECOM,unlessotherwiseexpresslystateddocument.NopartymayrelyuponthiswithoutpriorexpresswrittenagreementAECOM. Client: CHAINAGE

LEVEL Project: 325 335 345 355 365 375 385 395 405 320 330 340 350 360 370 380 390 400

00.000 0 CHAINAGE

LEVEL 365 375 385 395 405 415 425 325 335 345 355 320 330 340 350 360 370 380 390 400 410 420 430 10.000

00.000 0

20.000 SPILLWAY INFRASTRUCTURE TO NANTYBETWS 10.000

30.000

20.000

OGL 40.000

30.000 50 50.000

40.000

60.000 50 50.000

70.000

60.000

80.000

70.000 Figure 4.3Indicative Elevationsand SectionofQ1Dam, ExtentofExcavationand Reservoir 90.000

80.000 100 100.000 GLYN RHONWYPUMPEDSTORAGE DEVELOPMENTCONSENTORDER 90.000 MAXIMUM OPERATIONALWATERLEVEL392.00m MINIMUM OPERATIONALWATERLEVEL340.00m A 110.000 100 100.000 Q1 DAMSECTION B 120.000

110.000 Q1 RESERVOIRSECTION

130.000

120.000 DAM ACCESSTRACK

140.000 1:500

130.000 150 150.000

140.000

160.000 150

1:500 150.000 SCOUR/OVERFLOW PIPE

170.000

160.000 STABILISED SLOPE 180.000

170.000

190.000

180.000 200 200.000 DAM 190.000

210.000 200 200.000

220.000

210.000 FGL 395m

230.000 DAM 220.000 MAXIMUM OPERATIONAL WATER LEVEL392.00m

240.000

230.000 250

FGL 395m 250.000

240.000

260.000 TWL 393.00m 250 250.000 STABILISED SLOPE CF105BT Cardiff 1 CallaghanSquare DAM ACCESS TRACK 270.000

260.000

280.000 270 270.434270.000 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 400 405 410 415 420 425 430

290.000 LEVEL 293 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 400 405 F +44(0)292067 4699 T +44(0)292067 4600 LEVEL www.aecom.com Drawing Number: Date: Verified: Drawn: 1. 2. NOTES LEGEND OGL TWL FGL NOTED. ORDNANCE DATUMUNLESSOTHERWISE OTHERWISE NOTED.DONOTSCALE. ALL LEVELSINMETRESANDREDUCEDTO ALL DIMENSIONSINMETERSUNLESS 0 FINISHED GROUNDLEVEL 1:500 ORIGINAL GROUNDLEVEL TOP WATERLEVEL 07.08.15 JJA CA Figure 4.3 12.5 Scale atA1: Approved: Checked: 25 1:500 m CA AH A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

NOTES

0 1.25 2.5 m 1:50

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:50 Figure 4.4 Indicative Elevations and Section of Relief Valve and Spillway Infrastructure Details Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.4 A1 2UGQDQFH6XUYH\&URZQ&RS\ULJKW$OOULJKWVUHVHUYHG/LFHQFHQXPEHU This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

0 50 100 150 176 205 205

200 200

195 195

190 190

185 185

0 50 100 150 175 180 180 170 170

175 175 OGL 165 165

170 170 COMBINED OVERFLOW/SCOUR DAM 160 160 RISING MAIN TOUR TWL 154.5m 165 165 MAXIMUM OPERATIONAL 155 WATER LEVEL 154.00m 155 160 160 150 150 MAXIMUM OPERATIONAL 155 155 OGL WATER LEVEL 154.00m 145 145

150 150 140 140 SCOUR/OVERFLOW/ 145 145 135 RISING MAIN ROUTE 135

140 140 130 130

135 135 LEVEL

125 125 LEVEL LEVEL LEVEL 130 130 STABILISED SLOPE 120 120

125 125 115 115

120 120 STABILISED SLOPE 110 110

115 115 105 105

110 110 100 100

105 105 95 95 MINIMUM OPERATIONAL 100 100 90 WATER LEVEL 90.00m 90

95 95 85 85 MINIMUM OPERATIONAL 90 WATER LEVEL 90.00m 90

85 85 CHAINAGE 20.000 40.000 00.000 30.000 50.000 60.000 70.000 80.000 90.000 10.000 100.000 150.000 175.120 110.000 120.000 130.000 140.000 160.000 170.000 80 80 P Q6 RESERVOIR SECTION 75 75 1:500

70 70

CHAINAGE 40.000 00.000 20.000 30.000 50.000 60.000 70.000 80.000 90.000 10.000 100.000 150.000 176.269 110.000 120.000 130.000 140.000 160.000 170.000 N Q6 DAM SECTION 1:500

LEGEND

OGL ORIGINAL GROUND LEVEL

TWL TOP WATER LEVEL

0 12.5 25 m 1:500

NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METRES AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED.

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:500 Figure 4.6 Indicative Elevation and Section of Q6 Dam, Extent of Excavation and Reservoir Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.6 A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

COMBINED SCOUR INLET AND OUTLET FOR RISING MAIN FROM LLYN PADARN

OVERFLOW INTAKE

9 SCOUR/OVERFLOW TOWER PLAN 1:50

OVERFLOW INTAKE TWL 154.50m

MAXIMUM OPERATIONAL WATER LEVEL 154.00m

DAM CONSTRUCTED TO 2:1 (TOP OF DAM 156.00m. AOD) TUNNEL

3000 2500 LEGEND COMBINED SCOUR INLET AND OUTLET FOR RISING MAIN FROM LLYN PADARN TWL TOP WATER LEVEL

0 1250 2500 mm 10 SCOUR/OVERFLOW SECTION 11 SCOUR/OVERFLOW TUNNEL SECTION 1:50 1:50 1:50 NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METRES AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED.

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:50 Figure 4.7 Indicative Elevation and Section of Q6 Scour Tower Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.7 A1 This documenthasbeenpreparedbyAECOMforthesoleuseofourClient(the"Client")andinaccordancewithgenerallyacceptedconsultancyprinciples,budgetfeestermsreferenceagreedbetweenClient.AnyinformationprovidedthirdpartiesreferredtohereinnotcheckedorverifiedAECOM,unlessotherwiseexpresslystateddocument.NopartymayrelyuponthiswithoutpriorexpresswrittenagreementAECOM. Client: CHAINAGE

LEVEL 105 115 125 135 145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335 345 355 365 375 385 395 405 415 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 45 50 55 60 65 70 75 80 85 90 95

00.000 0 10.000 20.000 30.000 40.000 50 50.000 Project: 60.000 70.000 80.000

90.000 100 100.000 110.000 120.000 PENSTOCK INLET/ 130.000 OUTLET SHAFT

140.000 150 150.000 160.000 170.000 180.000

190.000 200 200.000 210.000 220.000 230.000

240.000 250 250.000 260.000 270.000 280.000

290.000 300 300.000 310.000 320.000 330.000

340.000 350 350.000 360.000 370.000 380.000

390.000 400 400.000 410.000 420.000 430.000

440.000 450 450.000 460.000 470.000 480.000

490.000 500 500.000 510.000 520.000 530.000

540.000 550 550.000 560.000

Figure 4.8Indicative Elevationsand SectionofPenstock Configuration 570.000 580.000 600 GLYN RHONWYPUMPEDSTORAGE DEVELOPMENTCONSENTORDER 590.000 600.000 610.000

J 620.000 630.000

640.000 650 650.000 TYPICAL TUNNELSECTION 660.000 670.000 680.000

690.000 700 700.000 710.000 720.000 730.000 PENSTOCK TUNNEL

740.000 750 G 750.000 760.000 770.000

PENSTOCK TUNNELSECTION 780.000

790.000 800 800.000 810.000 820.000 OF EXCAVATEDMATERIAL OUT TOALLOWREMOVAL TUNNEL FLOORBROKEN EXCAVATED FACE ANNULUS GROUT 830.000 LINER 840.000 850 850.000 860.000

1:50 870.000 880.000

890.000 900 900.000 910.000 920.000 930.000

940.000 950 950.000 960.000 970.000 980.000

990.000 1000 1000.000

1:2500 1010.000 1020.000 1030.000

1040.000 1050 1050.000 1060.000 1070.000 1080.000

1090.000 1100 1100.000 1110.000 1120.000 1130.000

1140.000 1150 1150.000 1160.000 1170.000 1180.000

1190.000 1200 1200.000 1210.000 1220.000 1230.000

1240.000 1250 1250.000 1260.000 1270.000 1280.000

1290.000 1300 1300.000 1310.000 1320.000 1330.000

1340.000 1350 1350.000 1360.000 1370.000 1380.000

1390.000 1400 1400.000 1410.000 TEMPORARY 1420.000 ACCESS SHAFT CF105BT Cardiff 1 CallaghanSquare 1430.000

1440.000 1450 1450.000 1460.000 1470.000 1480.000

1490.000 1500 1500.000 POWERHOUSE 1510.000 SHAFT 1520.000 1530.000

1540.000 1550 1550.000 1560.000

F +44(0)292067 4699 T +44(0)292067 4600 1570.000 1580.000 1596 www.aecom.com 1590.000 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 50 55 70 75 80 85 90 95 300 305 310 315 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 60 65 200 205 210 215 220 225 230 235 240 245 250 255 260 265 270 275 280 285 290 295 45 400 405 410 415

LEVEL Drawing Number: Date: Verified: Drawn: 1. 2. NOTES 0 NOTED. 0 ORDNANCE DATUMUNLESSOTHERWISE OTHERWISE NOTED.DONOTSCALE. ALL LEVELSINMETRESANDREDUCEDTO ALL DIMENSIONSINMETERSUNLESS 1:2500 1:50 07.08.15 JJA CA 1.25 625 Figure 4.8 Scale atA1: Approved: Checked: 125 2.5 m m AS NOTED CA AH A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

NATURAL SLATE ROOFING TILES. TYPICAL

NATURAL SLATE FACING MASONRY TYPICAL UP TO 15000 UP TO 12000 UP TO 10000

157.5mAOD 157.5mAOD

GIS SUBSTATION BUILDING POWER TRANSFORMER WORKSHOP APPROXIMATELY 12000 APPROXIMATELY 7000 SWITCHGEAR APPROX. 26400 BUILDING APPROXIMATELY 18000

Q POWER HOUSE ELEVATION 1:125

NOTES

1. ALL DIMENSIONS IN MILLIMETERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METERS AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED. 3. THIS DRAWING TO BE READ IN CONJUNCTION WITH DRAWING NUMBERS =1&72=1&$1'$// REFERENCED DETAIL DRAWINGS. 4. ALL BUILDINGS DETAILS ARE INDICATIVE AND SUBJECT TO ARCHITECTURAL DETAILED DESIGN AND APPROVAL VIA DCO REQUIREMENTS 5. GIS SUBSTATION BUILDING DESIGN IS SUBJECT TO APPROVAL BY SP MANWEB

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:125 Figure 4.10 Indicative Elevations and Section of Power House, Turbine Shaft and Turbine House Configuration Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.10 A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

GANTRY CRANE

GIS SUBSTATION

UPTO 15000mm BUILDING

POWER SWITCHGEAR 22000 TRANFORMER 157.5mAOD BUILDING

METAL ACCESS STAIRS/LANDING AND HANDRAILS

CABLE SHAFT

GENERATOR

CABLE MAIN INLET VALVE GALLERY

CABLE 7$,/5$&( GALLERY TUNNEL 60.00mAOD NOTES TURBINE 1. ALL DIMENSIONS IN MILLIMETERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METERS AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED. 3. ALL BUILDINGS DETAILS ARE INDICATIVE AND SUBJECT TO ARCHITECTURAL DETAILED DESIGN AND APPROVAL VIA DCO REQUIREMENTS 4. GIS SUBSTATION BUILDING DESIGN IS SUBJECT TO APPROVAL BY SP MANWEB

K POWER HOUSE SHAFT SECTION 0 5000 10000 1:200 mm 1:200

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:200 Figure 4.11 Indicative Elevations and Section of Power House, Turbine Shaft and Turbine Hall Configuration Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.11 A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

OVERFLOW FROM Q6 OVERFLOW/SCOUR TO LLYN PADARN

INTAKE

SCOUR/PUMPED RISING MAIN TO TAILPOND

CABLE KIOSK PIT

12 PUMPING STATION AND UNDERGROUND VALVE CHAMBER PLAN 1:50

GRID COVER GRID COVER OGL

MINIMUM RECORDED WATER LEVEL IN LYN PADARN TWIN GUIDE RAIL FOR SUMP PUMP

MINIMUM WATER LEVEL

INTAKE INTAKE PIPE

PUMP STOP

13 PUMPING STATION AND VALVE CHAMBER SECTION 1:50 0 1250 2500 mm 1:50

NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. 2. ALL LEVELS IN METRES AND REDUCED TO ORDNANCE DATUM UNLESS OTHERWISE NOTED.

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:50 Figure 4.13 Indicative Elevation and Section of Pumping Station Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.13 A1 This document has been prepared by AECOM for the sole use of our Client (the "Client") and in accordance with generally accepted consultancy principles, the budget for fees and terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM.

CHAINAGE ĺ

0 50 100 150 200 250 300 343 365 365 360 360 355 355 350 FGL 350 345 FGL 345 340 340 335 335 330 330 325 325 OGL LEVEL 320 320 LEVEL 315 315 310 310 305 305 300 300 295 295 290 290

CHAINAGE 40.000 00.000 20.000 60.000 80.000 30.000 50.000 70.000 90.000 10.000 200.000 210.000 220.000 230.000 240.000 250.000 260.000 270.000 280.000 290.000 300.000 310.000 320.000 330.000 340.000 343.249 100.000 150.000 110.000 120.000 130.000 140.000 160.000 170.000 180.000 190.000 C Q1 SLATE MOUND SECTION CHAINAGE ĺ 1:1000

0 50 100 150 200 250 300 335 370 370 365 FGL 365 360 360 355 355 350 FGL 350 345 345 340 340 335 335 OGL 330 330 LEVEL LEVEL 325 325 320 320 315 315 310 310 305 305 300 300

CHAINAGE 20.000 40.000 00.000 30.000 50.000 60.000 70.000 80.000 90.000 10.000 200.000 210.000 220.000 230.000 240.000 250.000 260.000 270.000 280.000 290.000 300.000 310.000 320.000 330.000 335.287 100.000 150.000 110.000 120.000 130.000 140.000 160.000 170.000 180.000 190.000

D Q1 SLATE MOUND SECTION 1:1000 CHAINAGE ĺ

0 50 100 150 200 250 300 350 380 380 380 375 375 370 370 365 FGL 365 360 360 355 355 350 350 345 OGL 345 340 340

LEVEL 335 335 LEVEL 330 330 325 325 320 320 315 315 310 310 305 305

CHAINAGE 20.000 40.000 00.000 30.000 50.000 60.000 70.000 80.000 90.000 10.000 200.000 210.000 220.000 230.000 240.000 250.000 260.000 270.000 280.000 290.000 300.000 350.000 310.000 320.000 330.000 340.000 360.000 370.000 379.839 100.000 150.000 110.000 120.000 130.000 140.000 160.000 170.000 180.000 190.000 E Q1 SLATE MOUND SECTION 1:1000 CHAINAGE ĺ

0 50 100 150 200 250 300 332 375 375 370 370 365 365 360 FGL 360 355 355 350 350 LEGEND 345 OGL 345 340 340 OGL ORIGINAL GROUND LEVEL LEVEL LEVEL 335 335 330 330 FGL FINISHED GROUND LEVEL 325 325 320 320 315 315 NOTES

1. ALL DIMENSIONS IN METERS UNLESS OTHERWISE NOTED. DO NOT SCALE. CHAINAGE 40.000 00.000 20.000 30.000 50.000 60.000 80.000 90.000 70.000 2. ALL LEVELS IN METRES AND REDUCED TO 10.000 331.501 200.000 250.000 210.000 220.000 230.000 240.000 260.000 270.000 280.000 290.000 300.000 310.000 320.000 330.000 100.000 150.000 110.000 120.000 130.000 140.000 160.000 170.000 180.000 190.000 ORDNANCE DATUM UNLESS OTHERWISE NOTED. F Q1 SLATE MOUND SECTION 3. SEE FIGURE 4.2 FOR SECTION OVERVIEW 1:1000 0 25 50 m 1:1000

Client: Project: Drawn: JJA Checked: AH GLYN RHONWY PUMPED STORAGE DEVELOPMENT CONSENT ORDER Verified: CA Approved: CA 1 Callaghan Square T +44 (0)29 2067 4600 Date: 07.08.15 Scale at A1: 1:1000 Figure 4.15 Indicative Elevations and Section of Excess Spoil Mound near Q1 Cardiff F +44 (0)29 2067 4699 CF105BT www.aecom.com Drawing Number: Figure 4.15 A1