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Planning Act 2008 The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009

The Wrexham(Gas Fired Power Station) Order

Revision: Date: Description:

0 March 2016 Submission version

PINS Reference Number: EN010055Document Reference Number: 6.1Regulation Number: 5(2) (a)Lead Author: Savills (UK) Ltd.

6.1 Volume 1: Non-technical Summary to Environmental Statement

WREXHAM ENERGY CENTRE ENVIRONMENTAL STATEMENT

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Chapter 1 One Introduction

INTRODUCTION

1.1 Wrexham Power Limited (WPL) is applying to the Secretary of State under the Planning Act 2008 (the 2008 Act) and for powers to construct, operate and maintain a combined cycle gas turbine (CCGT) power station (the Power Station Complex) together with infrastructure and landscaping works (the Power Station Complex Site), and a connection to the national gas transmission system (NTS) in order to supply the fuel (the Gas Connection), all of which forms the Scheme, also known as the Wrexham Energy Centre (WEC). The Scheme will be constructed on land at Wrexham Industrial Estate (WIE), to the east of Wrexham.

1.2 The Scheme comprises:

a combined cycle gas turbine (CCGT) power station (the ‘Power Station Complex’) (work numbered 1 in Schedule 1 to the Order) which would be fuelled by natural gas and would have a generation capacity of up to 299 megawatts (MWe);

the temporary and permanent Laydown Areas (works numbered 2A and 2B respectively in Schedule 1 to the Order);

surface water drainage works (work numbered 3 in Schedule 1 to the Order);

the landscape and ecological mitigation works (work numbered 4 in Schedule 1 to the Order);

the alteration and use of the Kingmoor Park Access Road (work numbered 5 in Schedule 1 to the Order) (together the ‘Power Station Complex Site’);

the Gas Pipeline and an Above Ground Installation (AGI) (the ‘Gas Connection’).

1.3 The Power Station Complex Site and the Gas Connection have separate consenting requirements. However, the Environmental Statement (ES) assesses both elements in order to identify, insofar as possible, the likely significant environmental effects of the Scheme as a whole. As such, this ES also considers the Scheme as a whole.

1.4 The Power Station Complex Site is classified as a Nationally Significant Infrastructure Project in accordance with the 2008 Act and therefore a development consent order (DCO) is required to authorise its construction and operation.

1.5 In Wales, associated development cannot generally be included in a DCO. Therefore, the Gas Connection will be consented via a separate planning application


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made under the Town and Country Planning Act 1990 (‘TCPA 1990’) and submitted to the Local Planning Authority, Wrexham County Borough Council.

1.6 The Scheme will require a connection to the local electrical distribution network to export the electricity generated to the local 132kV electrical distribution network currently operated by SP Energy Networks (SPEN) (the Electrical Connection). The Electrical Connection is not part of the Application for the Power Station Complex Site. The final design and consenting route for the Electrical Connection will be determined at a later date by SPEN as the Distribution Network Operator.

1.7 The Power Station Complex Site is situated in an area known as Kingmoor Park South, and comprises partly greenfield and partly brownfield land, the latter being an area formerly occupied by the Owens Corning Fibreglass factory.

1.8 A full description of the Scheme is provided in chapters one and four of the Environmental Statement (ES). The location of the Scheme is shown in Figure NTS1 below:

Figure NTS1: Site location (excerpt from ES figure 1.1)


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THE APPLICANT

1.9 WPL is a joint venture company established by St. Modwen and Glenfinnan Properties. Both companies have an extensive background in the development and economic regeneration of sites throughout the UK, including projects in the energy sector. WPL has employed a project team comprising:

Atkins - engineering design and environmental consultants;

Savills - town planning and property consultants;

Pinsent Masons – legal advisors;

Bruton Knowles – land and compulsory acquisition consultants

Local Dialogue - community and stakeholder relations consultants.

1.10 The team was tasked with preparing the Application and planning application for the Gas Connection in consultation with Wrexham County Borough Council (WCBC), other relevant authorities, the local community, landowners and other interested parties including relevant statutory bodies, with the aim of securing a DCO and planning permission for the Scheme.

ENVIRONMENTAL IMPACT ASSESSMENT (EIA)

1.11 Environmental Impact Assessment (EIA) is a process through which the likely significant environmental effects of a development can be identified and where possible, adverse effects avoided or mitigated. This process is reported in an Environmental Statement (ES). This Non-Technical Summary (NTS) provides a summary of the ES in non-technical language, and is structured under headings 1-20, corresponding to the content of the main ES written statement.

1.12 In accordance with the Infrastructure Planning (Environmental Impact Assessment) Regulations 2009 and The Town and Country Planning (Environmental Impact Assessment) (England and Wales) Regulations 1999, copies of the ES are available to be viewed in the following locations:

The Planning Inspectorate National Infrastructure Planning website via: http://infrastructure.planningportal.gov.uk/

Wrexham County Borough Council’s offices located at: The Guildhall, Wrexham, Clwyd LL11 1AY, Redwither Tower, Wrexham Industrial Estate, Wrexham, LL13 9XT

1.13 An electronic DVD copy and print hard copy of the ES can also be provided by Savills Planning, Wessex House, Priors Walk, Wimborne, BH21 1PB. There is a charge of £5

http://infrastructure.planningportal.gov.uk/


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for DVD copies, and a charge of £325 (exclusive of postage and packaging) for printed hard copies.

CONSULTATION

1.14 Consultation under section 47 of the PA 2008 took place in accordance with a Statement of Community Consultation (SoCC) published beforehand by WPL. The consultation process is described in the Consultation Report that accompanies the DCO application (Document Reference 5.1).

1.15 Consultation documents included a Preliminary Environmental Information Report (PEIR), published in July 2014. The PEIR enabled the local community and other consultees to understand the likely significant environmental effects of the Scheme to inform their responses to the scheme consultation. Feedback from the consultation process was taken into account in the EIA process and is reflected in this ES.


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Chapter 2Two Planning and Legislative Context

2.1 A range of European, national, regional and local policy regulations and guidance have influenced the Scheme. The principal sources of guidance are outlined below.

NATIONAL POLICY STATEMENTS

2.2 The following National Policy Statements are relevant to the Scheme:

EN-1: Overarching NPS for Energy

2.3 This NPS explains the need and urgency for new electricity generation capacity in the UK. It highlights that at least 22GW of existing electricity generating capacity will need to be replaced in the years leading up to 2020. It explains that fossil fuel power stations will play a vital role in providing reliable electricity supplies.

EN-2: NPS for Fossil Fuel Electricity Generating Infrastructure

2.4 This NPS provides specific guidance for projects of this type, including considerations such as design and the ability to adapt to climate change. It also provides further guidance on issues such as air quality and emissions, landscape and visual effects, noise and vibration and water quality and resources.

EN-4: NPS for Gas Supply Infrastructure and Gas and Oil Pipelines

2.5 This NPS sets out government policy on new gas import and storage infrastructure now that the UK has become a net gas importer. It is relevant insofar as it identifies site selection factors such as noise, biodiversity and landscape considerations.

PLANNING POLICY WALES (EDITION 8, JANUARY 2016)

2.6 Planning objectives for Wales are set out in the Welsh Government’s document Planning Policy Wales (PPW). This does not contain specific policies for nationally significant infrastructure projects, but is a material consideration in the decision-making process. PPW identifies a number of issues relevant to the site selection, design and assessment process for this Scheme, which include conserving natural heritage and the historic environment, economic development, transport, and


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infrastructure. These factors have been taken into account in the design and assessment of the Scheme.

STATUTORY DEVELOPMENT PLAN

2.7 The Development Plan for Wrexham County Borough, including the whole of the Site, is the Wrexham Unitary Development Plan (UDP). A number of adopted development plan policies have been taken into account in the design and assessment of the Scheme. These include UDP Policy E3, which allocates the Power Station Complex Site for major development as an extension to the Wrexham Industrial Estate.


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Chapter 3Three Site Selection, Alternatives and Design Evolution

CHOICE OF ELECTRICITY GENERATION TECHNOLOGY

3.1 WPL has concluded that CCGT power generation represents an appropriate choice of fuel and technology for the Scheme, because CCGT technology is highly energy efficient and carbon dioxide emissions are much lower from CCGT power stations than from coal-fired power stations.

3.2 Gas-fired power stations can also respond flexibly to peaks in energy demand, thus enabling a balanced supply of electricity to be maintained to the National Grid in combination with fluctuating energy sources such as wind and solar generation. In addition, CCGT technology has a proven track record in the UK with its environmental effects being widely understood.

SITE SELECTION

3.3 WPL has undertaken a strategic search for potential CCGT sites in the UK using a phased methodology which considered locations where sufficient gas supply and electrical grid capacity coincide, and where specific site requirements could be met. These included the need for a broadly level site of at least 3 hectares, suitable road access, avoidance of areas with planning and environmental constraints, and locations separated from housing and other sensitive land uses.

3.4 Several site options fulfilling the identified criteria were considered in the Wrexham area. This resulted in WPL undertaking a broad search for sites in the area which resulted in the Wrexham Industrial Estate (WIE) to the east of Wrexham becoming the focus of the site search process due to its location, scale and character, the availability of appropriate grid connections and vehicular access, and the absence of protective environmental constraints or designations. WIE is a substantial industrial estate, one of the largest in Europe, being approximately 550 hectares (ha) in size and employing around 7,000 people.

3.5 Within the WIE, Kingmoor Park was identified as particularly suitable. This is for reasons including its status as a part brownfield site which has been granted planning permission(s) for major commercial development, the designation under UDP Policy E3 favouring major expansion of the WIE, and the avoidance of areas designated for landscape, natural or heritage interest.

3.6 Within the E3 designated area, Kingmoor Park South was selected for reasons including its position adjacent to the existing WIE where the character is more


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industrial, the greater separation distances from residential properties, and the potential for shorter electrical and gas connection corridors.

GENERATION CAPACITY AND CARBON CAPTURE

3.7 WPL has decided to pursue a Scheme with a rated electrical output of no more than 299 MWe. This decision has been made on the basis that the existing available gas supply and electrical distribution networks can cater for the Scheme without the need for significant infrastructure upgrades. In addition this selection avoids the need to use a substantial area of land at the WIE, for carbon capture and storage equipment, that could otherwise be used for industrial and employment purposes.

POWER STATION COMPLEX LAYOUT AND DESIGN

3.8 General design objectives for the Scheme were to achieve a compact, technically robust and deliverable layout that takes full account of known physical and environmental constraints. A further objective was to ensure that the layout relates well to existing industrial development at the WIE, along with potential future development on Kingmoor North, whilst avoiding any unacceptable effects to local amenity. Given modern environmental restrictions on water discharges, the Scheme incorporates an air-cooled system. The ES has assessed the potential ‘worst case’ of the Scheme based on the minimum and maximum parameters of development set out in Section 4 below.

COMBINED HEAT AND POWER (CHP)

3.9 The Scheme incorporates the potential for a heat network interface building from which it would be feasible to process and supply heat to commercial uses elsewhere within the WIE. At the time of writing the local heat demand has not been able to be fully quantified. However, the indicative Power Station Complex layout makes provision for accommodation of a Heat Interface Building so that the Power Station Complex Site will be CHP ready.

GRID CONNECTIONS

3.10 Figure NTS2 below identifies the area within which the exact routing of the Gas Connection would be made to the existing local gas supply infrastructure.


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Figure NTS2: Potential Gas Connection Corridor

3.11 Various gas connection route options were considered taking account of discussions with network operators and consideration of issues such as land ownership, and engineering and environmental sensitivities. The Gas Connection Route was selected because of its generally flat topography, absence of any significant engineering challenges and the predominant land use being agricultural.


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Chapter 4Four The Proposed Scheme

THE POWER STATION COMPLEX SITE

4.1 The Power Station Complex Site is situated off Bryn Lane on Kingmoor Park South, Wrexham Industrial Estate. It comprises approximately 19.5 ha of land, part of which is previously developed. The terrain gently slopes downwards to the north-east, with the highest point being on the southern boundary at 31.5m AOD and the lowest in the north-eastern corner at 22m AOD. Part of an Owens Corning Fibreglass factory complex formerly occupied the western and south eastern areas of the Power Station Complex Site.

4.2 The Order Land encloses an area of approximately 36.2 hectares, including approximately 19.5 hectares for the Power Station Complex Site of which 3.3 hectares is occupied by the Power Station Complex and 5.0 ha by landscape and ecological mitigation.

4.3 The Power Station Complex Site is served by the Kingmoor Park Access Road from Bryn Lane, a high standard two lane road that serves as the outer ring road of the WIE. Bryn Lane joins the recently opened Industrial Estate Road (N), a new dual carriageway that links the industrial estate to the A534 to the north providing dual carriageway access to the motorway network. A new southern access road links the industrial estate to the A525 to the south. Both the northern and southern access roads now provide the industrial estate, and hence the Scheme, with good links to the surrounding strategic highway network.

THE PROPOSED DEVELOPMENT

4.4 The Scheme includes a Combined Cycle Gas Turbine (CCGT) Power Station. To operate, it will require a connection to the gas transmission network for importing the natural gas fuel, and a connection to the electricity network to export the power generated. The Power Station Complex would be fuelled by natural gas and would have an electrical generation capacity of up to 299 megawatts (MWe). The electricity generated would be exported to the local 132kV electrical distribution network currently operated by Scottish Power Energy Networks (SPEN).


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Figure NTS3 - Summary of how a combined-cycle- gas turbine power station works (excerpt from Figure 4.10)

4.5 The Power Station Complex comprises the following components:

Gas Turbine Building - which contains up to two gas turbines, each connected to its own generator which produces electrical power;

Up to two Heat Recovery Steam Generators Buildings and Stacks - hot exhaust gases from each gas turbine are passed to an HRSG to recover heat and produce steam before being sent to the stack or stacks for release to the atmosphere.

Steam Turbine Building - The steam produced by the HRSG is used to drive a steam turbine and generate more electricity;

Water Treatment Plant and Water Storage Tanks - to supply and store demineralised water, process and fire fighting water.

Air Cooled Condenser – to cool and condense turbine exhaust steam;

Main and auxiliary step-up Transformers - for each gas and steam turbine;

Electrical Switchgear – which is anticipated to comprise a combination of Air-insulated Switchgear (AIS) and Gas-insulated Switchgear (GIS). It would be designed to enable the full Scheme output to be exported to Marchwiel substation;


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Pressure Regulating Installation (PRI) – which receives the supply of gas from the existing gas network;

Heat Network Interface - to accommodate the necessary equipment should a heating scheme be deemed viable;

Control and Administration Building - containing the main plant control room and offices for staff and contractors;

Workshop and Stores - for maintenance activities and the storage of chemicals and tools;

Foul Water Drainage and Pumping Station - for the discharge of trade effluent and domestic foul water to an underground pumping station where it will be pumped to the Welsh Water/Dwr Cymru local foul water sewerage network;

Parking - spaces for up to 20 vehicles;

Roads - servicing the various elements of the Power Station Complex,

Security Fencing and Gatehouse - around the Power Station Complex up to 2.5m in height incorporating access gates;

External lighting - including street lights within the Power Station Complex and lighting of the perimeter fence.

4.6 External lighting within the Power Station Complex will comprise street lights along the internal site roads, walkways, the perimeter fence and areas where access to plant would be required. Operational areas would be lit 24 hours a day.

4.7 The Scheme incorporates flexibility to achieve 299 MWe of rated generating capacity by means of up to 2 gas turbines. This is due to there being only a few turbine models currently available. As such the final specification and layout will be determined at a future date, during detailed design of the Scheme, when there may be a greater range of suitable equipment. On this basis consideration of various Power Station Complex configurations have been considered within the design of the Scheme. The assessment has considered the ‘worst-case’ to present a robust assessment of the potential environmental effects.


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Figure NTS4– Isometric view of Power Station Complex Extracted from document reference 2.5.5

4.8 The maximum physical dimensions of the proposed built elements of the Scheme are detailed in Table NTS1.1 below.

Table NTS1.1: Maximum physical dimensions of built elements in the Power Station Complex, with heights measured from 30m AOD

Reference Number (Fig 4.11)

Name Quantity Height

(m)

Length (m) Width (m) Diameter (m)

1 Gas turbine building

(part of Work No. 1A) 1 25 60 45 -

2 HRSG (part of Work

No. 1A) 1 to 2 35 25 13 -

3 Stack(s) (part of Work

No. 1A) 1 to 2 50 - - 6.5

4 Transformer 1 to 2 6 15 10 -


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(m)


Compound(s) (part of Work No. 1D)

5

Steam turbine building (part of Work

No. 1A) 1 21 45 26 -

6

Transformer Compound (part of

Work No. 1D ) 1 6 15 15 -

7 Switchgear room (part

of Work No. 1A) 1 5 15 10 -

8 132 kV switchyard

(part of Work No. 1D) 1 10 73 42 -

9 Air cooled condenser (part of Work No. 1A)

1 26 48 48 -

10

Administration/

control building (Work No. 1E)

1 10 20 10 -

11

Pressure regulating installation (part of

Work No. 1B ) 1 5 35 25 -

12 Raw / fire water tank (part of Work No. 1C)

1 20 - - 15

13 Water tank (part of

Work No. 1C) 1 to 2 20 - - 5

14

Water treatment system (part of Work

No. 1C) 1 10 20 25 -

15 Workshop (part of

Work No. 1B) 1 10 30 20 -

16 Parking (part of Work

No. 1G) Up to 20 - 4.8 2.4 -

17

Heat network interface building

(Work No. 1F) 1 15 45 25 -

18 Foul water pumping 1 - 12 8


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(m)


station

* Measurements relating to the gas turbine hall pertain to one, large single hall. Two smaller halls, if utilised, would fit, when combined, within these dimensions.

ACCESS ROADS

4.9 Vehicular access to the Power Station Complex Site would be via the existing Kingmoor Park Access Road, which connects to Bryn Lane.

LANDSCAPING AND PLANTING STRATEGY

4.10 Accompanying this Application are a series of drawings to show the illustrative landscape treatment for the Scheme, the design of which has had regard to a range of landscape, drainage and ecological considerations. Features of the strategy include:

a cluster of three new ponds in the north-eastern corner of the Power Station Complex Site, which will provide Great Crested Newt mitigation, marginal wetland planting and refugia mounds for amphibians;

a new woodland belt and a bund on the eastern side of the Power Station Complex Site to compensate for felling and to provide screening in views from properties to the east along the B5130;

an ecological mitigation area along the northern section of the Power Station Complex Site, comprising open grassland habitat to compensate for the loss of semi-improved grassland.

4.11 The effect of these measures will be to integrate the Power Station Complex Site into the local context and enhance habitat diversity.

CONSTRUCTION

4.12 For the purposes of the EIA, the programme envisages an overall construction period of 36 months.


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OPERATION AND MAINTENANCE

4.13 The plant will be designed to operate 24 hours a day, 7 days a week, other than during scheduled annual shutdowns, and will be capable of generating power at 100% Maximum Continuous Rating (MCR) for a minimum of 8,322 hours per annum. The Scheme will operate with approximately 30 staff working on a shift basis, with this number increasing during routine maintenance and shutdown activities.

DECOMMISSIONING

4.14 A CCGT power station has a notional design life of 25 years. For the purposes of the ES, an assumed operational life of circa 35 years is considered, as the life of the power station may be prolonged. Decommissioning activities are expected to be similar and no worse than the construction phase.


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Chapter 5Five Scope and Methodology of the EIA

5.1 In accordance with the Planning Act 2008, the Infrastructure Planning (Environmental Impact Assessment) Regulations 2009 (“EIA Regulations 2009”) and the Town and Country Planning (Environmental Impact Assessment) (England and Wales) Regulations 1999, the EIA process for the Scheme has included the following:

establishing the scope of the EIA by means of preparing a Scoping Report and then obtaining a Scoping Opinion from the Secretary of State;

considering any potential technical and environmental alternatives and establishing a worst case scenario for the purposes of assessment;

establishing a comprehensive understanding of the existing baseline conditions for the Scheme and the relevant study areas for each environmental topic;

identifying the potential environmental effects resulting from the Scheme;

determining how potential environmental effects can be avoided, reduced or offset through design and/or mitigation, and how benefits may be enhanced;

assessing the significance of the potential environmental effects in conjunction with other impacts arising from the Scheme and those from other neighbouring developments and / or sources (in-combination and cumulative impacts); and

proposing options as to how any significant residual effects will be mitigated, managed and monitored.

5.2 To provide the flexibility needed to achieve a Scheme that has a 299 MWe generating capacity, the ES has been based on a ‘realistic worst case’ scenario. This entails a “2+1” turbine arrangement (i.e. up to two gas turbines and up to two HRSGs, one steam turbine and a generator for each turbine). The maximum height of the Stack(s) would be 50 metres.

5.3 In accordance with the Scoping Opinion, the EIA incorporates a cumulative assessment of the Scheme alongside other major developments in the vicinity, including the Electrical Connection, the North Wales Prison, the Kingmoor Park North application and the Pickhill Bridge Solar Array.


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Chapter 6Six Socio-Economic

CONTEXT FOR ASSESSMENT

6.1 The socio-economic assessment has considered the effects of the Scheme in terms of employment and the economy, tourism, local disruption, energy security, and community infrastructure. Data from the Census 2011, Land Registry, Office for National Statistics were reviewed to establish a socio-economic baseline for a study area, and this was supplemented by consultation with local stakeholders including Wrexham County Borough Council and the regional Chamber of Commerce, and matters arising through EIA Scoping.

6.2 Key matters arising from the socio-economic baseline included:

the area has a higher than average economic activity rate (69.5%), with the unemployment rate below that of Wales and Wrexham;

the area has a slightly higher proportion of people with no qualifications and level 4 qualifications and above.

the development will present opportunities for the workforce and businesses in sectors aligned to energy, particularly the manufacturing sector locally;

commuting patterns suggest that the development is within easy access from major urban areas (between 10 and 15km) and a large potential workforce. A large proportion of residents live and work in Wrexham.

SUMMARY OF PREDICTED IMPACTS

6.3 The socio-economic impact assessment identified that the Scheme is likely to result in the following main residual impacts:

creation of employment during construction, operation, and decommissioning (around 515 jobs, 30 jobs, and 50 jobs respectively during these phases);

construction Gross Value Added of £3.19m nationally, of which £3m through indirect employment and income from direct employment of £1.9m in the sub-region; with a further £2.4m total GVA arising through decommissioning;

potential for around 50% of construction value (circa £117m) to be spent within the UK;

contribution to local and national energy security and energy production;


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there are no tourist attractions close to the site and hence no impacts on tourism are anticipated

any local disruption or effects on community infrastructure would be negligible in socio-economic terms.

MITIGATION MEASURES AND SUMMARY OF RESIDUAL EFFECTS

6.4 No direct mitigation measures are required, but certain measures are recommended to enhance the positive aspects of the Scheme where possible, including the use of local traders, contractors and suppliers in the construction process and the recruitment of local people for the operational stage.

6.5 Overall, the proposed Scheme is likely to have mostly positive socio-economic effects at both the local and regional levels.

6.6 The conclusions of Chapter 6 are that the Scheme in isolation or cumulatively does not result in any likely significant effects on Socio Economic Factors.


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Chapter 7Seven Transport and Traffic


7.1 The Scheme has incorporated a transport and traffic assessment which includes the impact of construction, operation (including maintenance) and decommissioning on the surrounding area in addition to a cumulative assessment.

7.2 In relation to indirect impacts, consideration has been given to how increases in traffic can have implications in terms of severance, driver and pedestrian delay, fear and intimidation, and accidents and safety. It has considered where adverse effects may occur, suitable routes to avoid these effects where possible, and mitigation measures that may be appropriate. The potential cumulative impacts of the Scheme construction occurring at the same time as the construction or operation of other developments in the local area have also been assessed.

PREDICTED IMPACTS

7.3 The maximum volume of HGV traffic to be generated by the Scheme would be during the construction phase, with 65 arrivals and 65 departures per day, and 10 arrivals and 10 departures per hour at peak. The proposed access route for construction vehicles is illustrated in Figure NTS5.


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Figure NTS5: Power Station Complex Site - Proposed Construction Access Route

7.4 During the construction phase of the Scheme, it is estimated that there will be temporary slight adverse effects on accidents/safety and residential amenity only. Any effects arising from the construction phase will be temporary and confined to the construction route north of the Power Station Complex Site and the small number of dwellings on Bryn Lane to the south. All other effects are estimated to be neutral.

7.5 Once operational the Scheme is predicted to generate 30 staff visits per day, the majority of which are likely to occur outside the highway peak periods. Therefore, the impact on the surrounding area is predicted to be negligible.

7.6 The level of traffic associated with the decommissioning of the Scheme is expected to be equal or lower than that generated during the construction, and therefore the effects are assessed to be in line with the construction phase. All cumulative effects for both the construction and operational phase are predicted to be no worse than slight-adverse.


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7.7 The implementation of a Construction Traffic Management Plan (CTMP) will spread construction traffic throughout the day and thus reduce the number of single occupancy cars visiting the site during construction. A draft of the CTMP is included as Appendix 7.5 to this ES, and deals with matters such as managing time slots for HGVs, preventing parking on public highways, wheel washing and protocols for abnormal loads.

7.8 Whilst no significant effects are identified associated with driver delay, the CTMP will further reduce any impacts on existing road users by ensuring sustainable travel measures are implemented at the site and therefore reducing the number of single occupancy vehicles. The effect on driver delay will be neutral.

7.9 Over the long term, i.e. post construction, all effects of the Scheme are predicted to be neutral. Overall it is predicted there will be no significant long-term operational traffic effects following completion of the construction phase for the Scheme. It is expected that residual effects related to decommissioning will be similar to the construction phase.

7.10 The conclusions of the Traffic and Transport chapter are that the Scheme in isolation and cumulatively would not result in any likely significant effects on traffic and transport.


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Chapter 8Eight Air Quality


8.1 An assessment has been undertaken of the potential impacts of the Scheme on air quality. It has considered, both separately and in combination, the direct and indirect effects of air pollutants associated with the Scheme, during the construction, operation and decommissioning phases. It has considered relevant legislation and policy, baseline air quality conditions, sensitive receptors, mitigation measures, residual effects and consideration of the potential for cumulative impacts.

8.2 The main component of the assessment was a study of the potential effects of the emissions to atmosphere from the Scheme Stacks on the local environment during operation. It also considered emissions from road transport during construction and operation, and dust emissions during the construction and decommissioning phases. The effect of these emissions on nearby human health and ecological receptors was addressed. The assessment zone is shown in Figure NTS6 below.

Figure NTS6: Air Quality Receptor Locations (excerpt from ES Figure 8.1, Volume 3)


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PREDICTED IMPACTS

8.3 The assessment has demonstrated that Scheme stack emissions will not lead to any exceedences of statutory air quality criteria at sensitive receptors. Total concentrations (including the background contribution) of nitrogen dioxide and carbon monoxide will continue to be below respective Air Quality Strategy (AQS) objectives at locations of sensitive receptors for human health. The effect of Scheme Stack emissions is in line with the relevant guidance and is therefore considered to be not significant. Ecological effects of oxides of nitrogen and nitrogen deposition at statutory and non-statutory sites were found to be insignificant, for all international sites of importance as well at national and local sites

8.4 No residual effects relating to dust emissions are anticipated beyond the Order Land. On this basis, all residential, commercial and sensitive industrial properties together with ecological receptors are likely to remain unaffected by dust throughout the construction period.

8.5 Changes to traffic flow during construction and operation of the Scheme have been evaluated against relevant air quality criteria and determined to have a “neutral” impact on local pollutant concentrations and as such, an insignificant effect on local receptors for human health and ecology

8.6 The air quality assessment has also considered the potential for cumulative impacts. The assessment found that risks of dust would not increase. In addition there will be no significant cumulative effects of traffic movements. Pollutant concentrations will remain below AQS objectives and the cumulative of Scheme emissions will be insignificant.


8.7 A range of mitigation measures are proposed to ensure the production and dispersion of dust during the construction of the Scheme is kept to an absolute minimum. These include site management and monitoring activities, incorporated into a Construction Environmental Management Plan (CEMP), a draft of which is included as Appendix 19.1 to the ES.

8.8 At the operational stage, no further measures are proposed in addition to those incorporated in the Scheme design. Because CCGT technology is inherently clean and the use of natural gas as a fuel ensures that stringent emission limits for oxides of nitrogen and carbon monoxide will be met and monitored under an Environmental Permit granted separately by Natural Resource Wales. Vehicle movements during the operational (including maintenance) phase are also negligible, meaning that further specific mitigation to control vehicle emissions is not required.


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8.9 Overall, it is considered that subject to mitigation measures, it is unlikely there will be any significant adverse effects on air quality as a result of the Scheme either in isolation or cumulatively.


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Chapter 9Nine Noise and Vibration


9.1 The ES has assessed potential noise and vibration effects, incorporating an assessment of the potential construction, operational (including maintenance) and decommissioning impacts. A study area of 1 km from the edge of the Order Land has been identified for the noise assessment, as shown in Figure NTS7 below.

Figure NTS7: Noise sensitive receptors (excerpt from ES Figure 9.1, Volume 3)

9.2 The detailed construction programme, methods of construction and construction plant are not fully known at this stage of the project assessment, and consequently a ‘worst case’ scenario as to the impacts on noise sensitive receptors has been assessed, based on realistic assumptions.

9.3 Likewise the exact equipment that will be installed at the Scheme is unknown, and conservative assumptions have therefore been made on the likely noise emissions of the equipment that could be used


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9.4 The highest noise levels are likely to be at the construction phase, during piling activities and breaking out of the existing concrete base. Other noise-generating activities would include the construction of earthworks, the use of diesel generators, welding, and vehicle movements. Road traffic noise is predicted to be negligible at all locations with the exception of Site 6, Kingmoor Park Access Road off Bryn Lane where minor impacts are predicted.

9.5 During the operational (including maintenance) phase, under typical operational conditions and with temporary, short-term maintenance activities, the noise impacts for occupied residential receptors would be insignificant and would not exceed the criteria set out in the relevant British Standard.


9.6 At the construction stage, the assessment has shown that in general the likely impacts from the Scheme would be ‘negligible’ and thus no specific mitigation measures are required. However best practicable means should be employed throughout the construction phase, and a number of good practice mitigation measures are included in the draft CEMP presented as Appendix 19.1 in this ES.

9.7 In operation, the use of quieter plant and equipment will be preferred, and if necessary plant and equipment will be fitted with silencing equipment (for example enclosures, baffles, attenuators) to ensure the levels specified in this report are achieved. Walls, roofs, roof-lights and shutter doors within the process buildings of the Power Station Complex will be acoustically designed to achieve sound insulation through the building fabric.

9.8 Good operating practice will also be employed for the control of noise. This includes adequate maintenance of any parts of plant or equipment whose deterioration may give rise to increases in noise, for example turbine bearings and integrity of noise attenuation enclosures. When not in use, any roller shutter doors should be kept closed. Any mechanical ventilation systems for supply or extraction of air to and from the process buildings will also be designed to minimise noise.

9.9 Cumulative effects have been assessed on a worst case scenario. In relation to noise effects associated with road traffic during the construction phase of the Scheme, one roadside location which is predicted to experience a negligible effect when the Scheme is considered in isolation would instead experience a minor adverse cumulative effect. Another site, which is the only one predicted to experience moderate adverse effects due to construction road noise when the Scheme is considered in isolation, will also experience moderate adverse effects when the Scheme is considered cumulatively. This is primarily due to the likely need for piling at the Kingmoor Park North development. These minor and moderate


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noise effects will not cause a worsening of the negligible effect predicted at the nearest sensitive receptor.

9.10 A similar approach to the noise impact assessment has been undertaken for vibration with the conclusion of negligible effects at sensitive receptors.

9.11 The conclusions of Chapter 9 are that the Scheme in isolation does not result in any likely significant effects on Noise and Vibration sensitive receptors.


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Chapter 10Ten Landscape and Visual


10.1 A landscape and visual impact assessment (LVIA) which has informed the design process, including siting options, landscape works, layout, materials and finishes has been incorporated within the ES. The assessment focuses on likely significant effects on the existing landscape resource and visual receptors within a defined study area.

10.2 The extent of the study area, which extends into England, is considered appropriate and has been agreed with WCBC and neighbouring Cheshire West & Chester Council, along with the location of the visual receptors and photomontages that have been undertaken.


10.3 During construction, the Scheme would result in significant moderate adverse effects to Landscape Character Area (LCA) 13 - Dee Terraces. This is due to the resulting change in the rural tranquillity and the presence of uncharacteristic features within the LCA which is predominantly rural. The construction activity would also result in significant moderate effects on a number of visual receptors in the locality (visual receptors 13 (PRoW 25 (footpath) including Cornish Hall and Holt Lodge), 18 (PRoW 24 (footpath) and residences at Aldersey Farm), 19 (Residences and vehicular users on Ridley Wood Road and B5130) and 20 (Residences at Marshley Farm and along the B5130)).

10.4 During operation the Scheme would introduce new buildings and structures within the Power Station Complex and at the location of the AGI. The Power Station Complex would result in significant moderate adverse effects to LCA13 Dee Terraces. This is due to the nature of the Scheme being incongruous with the LCA and detracting from the local character, effectively removing the Power Station Complex Site from the LCA and into the Wrexham Industrial Estate LCA.

10.5 In year 1 of opening and year 15, the height of the Power Station Complex would result in a moderate adverse effect for a number of visual receptors (visual receptors 13 (PRoW 25 (footpath) including Cornish Hall and Holt Lodge), 18 (PRoW 24 (footpath) and residences at Aldersey Farm), 19 (Residences and vehicular users on Ridley Wood Road and B5130) and 20 (Residences at Marshley Farm and along the B5130)) in day and night scenarios, again due to their proximity to the Power Station Complex Site or the openness of the view towards the vertical elements of the Scheme including the 50m high stacks. The Stacks and upper portions of other built features would be visible above the boundary vegetation.


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10.6 The intervening landform and vegetation would screen the majority of the construction activity for receptors in the study area, with the exception of the upper sections of the Stacks which generally align to the existing nature of distant views towards the two stacks at the nearby Kellogg’s factory, limiting the magnitude of change for those receptors.

10.7 Overall the effects on landscape character and visual amenity of the construction of the Gas Connection would not be significant. All operational effects associated with the Gas Connection would also not be significant.

SUMMARY OF RESIDUAL EFFECTS

10.8 Whilst the Scheme would result in some significant landscape and visual effects, the extent of these effects is limited to within a close proximity of the Power Station Complex. This is due to the positioning of the Power Station Complex within the vicinity of the Wrexham Industrial Estate (with buildings of a similar typology) and the visual screening provided to the west and south by other buildings within the Industrial Estate and to the east and north by a layering of hedgerows and trees situated across the flat floodplain landscape.

10.9 The conclusions of Chapter 10 are that the Scheme would result in moderate adverse (significant) effects during construction, operation and decommissioning on a small number of receptors, specifically LCA13c Dee Terraces, and visual receptors 13, 18, 19 and 20.

10.10 The Scheme cumulatively with the already-consented Kingmoor Park North may result in some major adverse effects during construction, operation and decommissioning on visual receptors 19 and 20 only.


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Chapter 11Eleven Ecology


11.1 The ES has assessed the potential significant effects of the Scheme on features of ecological interest within a defined study area. The Scheme has been surveyed for protected species and assessed for nature conservation value, with surveys including Phase I habitat surveys and protected species surveys for species including bats, newts, breeding birds, reptiles and invertebrates. Measures to mitigate potential significant negative effects are proposed and the residual effects on ecological features are then summarised. It also considers potential effects on Natura 2000 European designated sites due to nitrogen from Stack emissions.


11.2 Ecological assessment within the EIA of the Scheme has considered the habitats and ecology of the land to be used during the construction and operation of the Power Station Complex Site and the Gas Connection as well as of land in their vicinity and further afield. There has been particular attention paid to areas affected by nature conservation designations such as European sites (e.g. Special Areas of Conservation), nationally important Sites of Special Scientific Interest, and local conservation designations. All potential effects on such these sites such as by air emissions, changes in water flows, and effects on animals transiting to and from such sites that may cross the Scheme have been considered. There has been particular attention to protected and rare species of plants and animals.

11.3 Ecological assets considered in the assessment include the River Dee and Bala Lake/ Afon Dyfrdwy a Llyn Tegid SAC and the Afon Dyfrdwy/ River Dee SSSI as well as non statutory designated sites, area of ancient woodland, the local great crested newt meta-population, and habitats and species with the Power Station Complex Site and the Gas Connection Route.

11.4 The design of the Scheme has taken careful account of the constraints created by habitats, plant and animal species, and ecology and the protection afforded to them by law and policy, including local planning policy. Inherent and prescribed additional mitigation has been incorporated into the Scheme reflecting this ecological context.

11.5 The assessment has therefore considered a very wide range of nature conservation and ecological matters and for each the conclusion has been reached that the effects of the Scheme will not be significant. This series of conclusions applies across the construction, operation and decommissioning of the Scheme and across


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the whole of the Scheme which including the Power Station Complex Site and the Gas Connection Route.


11.6 A Construction Environmental Management Plan (CEMP) will specify measures for the physical protection of habitats, pollution prevention, and eradication of unwanted invasive species. A draft CEMP has been prepared (and is included as an Appendix 19.1 to this ES).

11.7 In addition a specific mitigation strategy will be implemented to avoid the disturbance, injury or killing of individual great crested newts within the Site. The mitigation strategy will involve the erection of temporary exclusion fencing around the Power Station Complex Site and Gas Connection Route to exclude great crested newts. In addition a capture and relocation programme for great crested newts will be implemented prior to site clearance and enabling works.

11.8 In respect of bats, a mitigation strategy will also be implemented which will include for the provision of bat boxes on suitable trees within the Power Station Complex Site and measures to reduce disturbance to foraging and commuting bats.

11.9 In terms of the Gas Connection, a strategy will be implemented to mitigate the short-term severance of hedgerows including the retention of hedgerow arisings to protect bat dispersal routes.

11.10 Subject to the mitigation measures, the Scheme would not give rise to any significant impacts on ecology. The cumulative ecological assessment has shown that there will be no significant cumulative effects arising from the Scheme with the other identified cumulative developments.


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Chapter 12Twelve Cultural Heritage


12.1 The ES has assessed impacts on the historic environment, including heritage assets within and around the Scheme. It addresses all known and potential heritage assets, and possible archaeological remains.


12.2 Construction works inside the Power Station Complex Site could result in direct physical impacts on a small area of ridge and furrow which has been assessed as low value. On the basis that there are no other known heritage assets located within the Power Station Complex Site and only limited potential archaeological remains are likely to be present, no significant direct physical impacts are anticipated. In terms of indirect impacts, given that the construction activity would be temporary and occurring within the context of the existing WIE, no impacts are predicted on the setting and significance of designated assets within the 5km study area.

12.3 During operation (including maintenance), the main impact on the historic environment will be caused by the visual presence of the Power Station Complex, particularly its tall elements. Only three assets would experience a greater than neutral effect relating to slight adverse effects with the magnitude of impact being minor. Decommissioning impacts associated with the Power Station Complex would be no worse than the construction phase.

12.4 The construction of the Gas Connection has the potential to impact upon unknown archaeological remains. No significant adverse effects on the setting of any designated asset are anticipated as a result of the construction of the Gas Connection. Similarly no impacts are anticipated as a result of the operation of the Gas Connection.

12.5 In terms of the cumulative assessment, no additional cumulative impacts on archaeological remains or on the setting of any heritage assets are anticipated.


12.6 An archaeological written scheme of investigation for the Scheme would be undertaken during the construction phase to address potential impacts on currently unrecorded archaeological remains. The minor adverse impacts on the setting of


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assets during construction cannot be mitigated further, and these are temporary and of relatively short duration.

12.7 During operation of the Scheme no mitigation measures specific to the historic environment have been identified, although the materials and colours for the external finish of the Power Station Complex are relevant to the historic environment.

12.8 In summary the construction, operation and decommissioning of the Scheme either alone or cumulatively with other developments would not result in any significant effects on the historic environment.


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Chapter 13Thirteen Ground Conditions


13.1 The ES has incorporated an assessment which focuses on ground contamination and the potential effects on surface waters, groundwater, and human health through the disturbance of contaminated ground. The study area comprises a 500m buffer around the Order Land.


13.2 During construction of the Power Station Complex Site without mitigation an increase in contamination risk from the existing baseline could result in a moderate adverse and therefore significant effect.

13.3 Once construction is complete and the Power Station Complex is operational neutral effects are anticipated given that potential risks to controlled water receptors from excavated and stockpiled material will no longer exist and groundworks will be complete. Decommissioning effects associated with the Power Station Complex will be no worse or the same as those anticipated during construction.

13.4 The construction of the Gas Connection will potentially introduce new sources of contamination and disturb existing sources of contamination. The assessment has determined that without mitigation construction of the Gas Connection could result in a minor adverse effect which is not-significant. Operational effects associated with the Gas Connection would be neutral. Decommissioning effects have not been considered on the basis that the Gas Pipeline will be purged of gas and will remain in-situ.

13.5 No significant cumulative effects are anticipated relating to the construction or operation of the Power Station Complex Site and Gas Connection.


13.6 Mitigation measures will be undertaken prior to and during construction, including:

ground investigation to quantify the level of contamination;

implementation of a materials management plan to identify remedial actions;

dust-suppression measures to prevent mitigation of contaminated dust;


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remediation if necessary;

working methods during construction to ensure that surface water cannot run-off from the works or stockpiles into adjacent surface watercourses.

13.7 Such mitigation measures will be incorporated into the CEMP. A draft CEMP is included as Appendix 19.1 to this ES. No mitigation measures specific to the operation of the Scheme have been identified.

13.8 Overall neutral effects are anticipated during the construction of the Power Station Complex Site and Gas Connection. During operation neutral effects are anticipated for human and groundwater receptors and minor beneficial effects are anticipated to surface water and property receptors. No significant cumulative effects are predicted.


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Chapter 14Fourteen The Water Environment


14.1 The ES has identified the likely significant effects with respect to the water environment as a result of the Scheme, including through the introduction of new potential pollutants. The study area for the assessment covers land within 3km of the Order Land, allowing for the identification of water receptors potentially affected.

Figure NTS8: Study area for water environment assessment (excerpt from ES Figure 14.1)


14.2 During construction of the Scheme likely effects on the surface water environment and flood risk would be insignificant. The magnitude of impact on groundwater quality is considered to be minor adverse potentially resulting in a significant effect


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on the Kinnerton Sandstone aquifer. All decommissioning effects would be similar to the construction phase.

14.3 During operation and maintenance of the Power Station Complex effects on water resources and flood risk are considered to be insignificant. The operation of the Gas Connection is likely to result in an insignificant and low beneficial effect on groundwater quality.

14.4 A Water Framework Directive (WFD) screening assessment has shown that the Scheme will not cause deterioration in the status of the ecological/chemical elements of the water body, or introduce impediments to the attainment of ‘Good’ WFD status.

14.5 The cumulative assessment concludes that there would be no significant effects on the water environment assuming the concurrent construction and operation activities for other local developments adhere to the same standards as the Scheme and require the same level of mitigation.


14.6 Mitigation measures during construction and operation of the Scheme will include:

Bunding of potential contaminant sources such as tanks and excavated soils;

Use of spill kits;

Obtaining appropriate permits for discharge to surface water;

Capturing site runoff and capturing contaminants prior to discharge;

Avoiding rupture of underground services such as sewers and pipes;

Carrying out a piling risk strategy prior to construction;

Complying with the Environment Agency’s applicable guidelines; and

The use of a Hydrobrake on the drainage system which means that the system can be easily shut off in case of a large spillage to prevent contaminated water discharging to the surface water drains and subsequently the River Dee.

14.7 The conclusions are that the Scheme in isolation and cumulatively with other developments does not result in any likely significant effects on the Water Environment.


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Chapter 15Fifteen Waste


15.1 The ES has assessed and identified the likely significant effects with respect to waste as a result of the construction, operation (including maintenance) and decommissioning of the Scheme.


15.2 The development of the Scheme will require clearance of the Power Station Complex Site including existing vegetation and stockpiles of materials. There will also be a requirement for excavation works to allow for the construction of piles, foundations, floor slabs and other infrastructure works. During the excavation, the main waste arisings generated will be inert soil and stone. An open trench will also be required to construct the Gas Pipeline (1.5m deep and 1m wide).

15.3 The construction of the Scheme will require a residual amount of waste requiring disposal. However given local recycling capacity, this would have a neutral effect on local recycling/treatment capacity. During operation of the Scheme, residual effects are also expected to be neutral, given the predicted amount of waste in relation to available local recycling/treatment capacity.

15.4 It is anticipated that levels of waste generated during decommissioning will be similar to those produced during the construction phase and will therefore have a similar neutral effect.

15.5 The cumulative assessment anticipates that the cumulative waste effects would be minor adverse and not significant based on the excavation, construction and operational phases of the Scheme and the combined effects from the identified cumulative developments.


15.6 Mitigation measures identified in the Scheme extend across the construction, maintenance, operation and decommissioning stages and include:

Crushing and re-using excavated concrete on site;

re-using uncontaminated excavated material;

treating hazardous materials on site where possible;


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encouraging the use of non-primary materials over primary materials;

using renewable materials and materials with lower environmental effects; and

regular removal of materials offsite by a licensed waste carrier.

15.7 Overall subject to the above measures, the Scheme, either in isolation or considered cumulatively with other development, will not result in any significant adverse effects.


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Chapter 16Sixteen Land Use


16.1 The ES has assessed the likely significant effects on agricultural soils and land related to the development of the Scheme. The assessment considers both direct and indirect impacts on the disturbance to farming operations and movement of soils. The study area comprises the agricultural land affected by the Scheme within the Order Land.


16.2 The construction, operation and decommissioning of the Power Station Complex Site would result in the permanent loss to farming of approximately 10.4ha of agricultural grassland. Without mitigation, the effects would be localised and no more than minor adverse.

16.3 The construction of the Gas Connection would result in temporary land take during the Gas Pipeline installation process. In addition, dust generated by the construction process could affect the quality of grass and arable crops. Effects would be no worse than minor-adverse and localised.

16.4 During operation of the Gas Connection the land would be restored to farming. All access for pipeline inspection and management will be via easements. There will be no other limitations on agricultural land use over the Gas Pipeline once installed. No significant effects are predicted during the operation phase.

16.5 The assessment concludes that all potential cumulative effects would be no worse than minor adverse.


16.6 Mitigation measures include the following:

Soil handling and storage to follow best industry practice. Land to be restored to equivalent quality.

Minimise effect of losses through close liaison with farmers.

Liaise with farmers and provide alternative field accesses and temporary crossings of the Gas Connection Route.


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Provide temporary water supplies during construction, as appropriate. Restore drains and water supplies on completion of work.

Provide temporary fencing during construction. Restore on completion of work.

Observing best construction practice to control dust and weeds.

Liaise with farmers about timing of work. Replanting of game cover, as appropriate.

16.7 Overall subject to the above measures, the Scheme, in isolation or cumulatively with other development, will not result in any significant adverse effects.


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Chapter 17Seventeen Health, Safety and Security


17.1 The ES has identified the health, safety and security measures which have been addressed within the design of the Scheme. The ES also provides a summary of the assessments relevant to health, safety and security that have been undertaken and are included within other chapters of the ES.


17.2 Potential traffic impacts relating to a general change in traffic composition and an increase in traffic flows may slightly increase the general risk of accidents during construction. On this basis traffic effects are predicted to be no more than slight adverse.

17.3 In terms of air quality, operational Stack emissions are considered to be insignificant to human health, as are emissions associated with operational traffic. During the construction period dust emissions present medium risk from demolition, but a low risk from all other activities. All potential dust receptors are considered to be of low sensitivity.

17.4 Based on reasonable assumed noise levels generated from the proposed construction activities, all potential construction noise impacts would be negligible. Likewise construction traffic noise will result in negligible effects at all locations apart from immediately outside the Power Station Complex Site entrance. All potential likely vibration effects during construction have been assessed as negligible.

17.5 All operational noise and vibration effects associated with the Scheme have been assessed as negligible. Decommissioning of the Power Station Complex would produce similar effects to construction, whilst the Gas Pipeline would be purged of gas and left in situ and hence no noise and vibration effects would be anticipated.

17.6 In terms of ground conditions, the construction of the Scheme could potentially disturb existing sources of contamination and introduce new pathways for migration of existing contamination. Without mitigation a moderate risk is predicted for receptors during construction, with similar risks during decommissioning.

17.7 There is a risk that construction of the Scheme could have a minor adverse effect on the principal aquifer in the Kinnerton Sandstone formation, which indirectly is a source of groundwater abstracted for drinking water. Once operational mitigation


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measures will mean that the potential for the aquifer to be affected will be reduced, leading to an insignificant or beneficial effect.


17.8 Mitigation measures detailed in the ES include:

A Construction Traffic Management Plan (CTMP) will detail a number of measures to mitigate the impact of construction traffic. This includes a HGV booking/management system and the use of police escorts and temporary road closures where required;

Implementation of a Construction Environmental Management Plan (CEMP), a draft of which is contained within the ES (Appendix 19.1). The CEMP will detail site management measures and monitoring activities (including dust mitigation measures);

The use of Best Practicable Means to be employed throughout the construction phase.

17.9 The conclusions of the ES assessment are that the Scheme either in isolation or in-combination with the other developments assessed as part of the cumulative assessment would not lead to any significant impacts on health, safety and security.


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Chapter 18Eighteen In-Combination Effects


18.1 In-combination effects where different types of effects (otherwise assessed separately within the ES) impact on the same receptor are included within the ES. These receptors include:

Humans (long terms residents/staff as well as ‘transient’ users e.g. pedestrians);

Property - residencies and other buildings;

Ecological - habitats, protected sites, and species;

Historic Environment - designated or undesignated heritage assets;

Landscape character;

Controlled waters - including surface waters and aquifers;

The economy;

Local waste infrastructure.

PREDICTED IN-COMBINATION EFFECTS

18.2 Considering the primary residential amenity drivers of visual impact, noise and air quality, it has been concluded that the Scheme will have no effect on residential amenity.

18.3 The conclusions of the In-Combination chapter are that the Scheme would not result in any likely significant in-combination effects, whilst noting that individual topic chapters have identified some topic specific likely significant effects where relevant.


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Chapter 19Nineteen Mitigation Summary

19.1 The ES provides a summary of the additional mitigation measures or management actions, above and beyond those that are inherent in the proposed design of the Scheme. These broadly fall into the following three categories:

Those measures included within the Scheme design;

Those measures undertaken during construction delivered through the Construction Environmental Management Plan (CEMP), to be approved by WCBC prior to commencement of construction;

Those measures undertaken during construction delivered through the Construction Transport Management Plan (CTMP), to be approved by WCBC prior to commencement of construction: and

Management actions undertaken following the completion as part of the operation of the Scheme including requirements of its Environmental Permit.

19.2 Proposed mitigation measures extend across a number of the technical disciplines covered, as shown in Table NTS2 below. The mitigation measures themselves are presented in the mitigation summary in Chapter 19 of the main ES. Mitigation measures have, where appropriate, been secured in Schedule 2 of the draft Order (Document reference 3.1) as DCO requirements.

Table NTS2: ES disciplines and effects encompassed by proposed mitigation

Discipline Effect

Air quality Emissions to air and effect on air quality

Surface water and

groundwater quality

Discharge to surface water and effect on flood risk and water quality

Traffic and access

Residential and pedestrian amenity, driver delay and risk of accidents

Ground conditions

Risk of contamination of soils, groundwater and surface water and impact on construction workers and offsite receptors

Noise and vibration

Residential amenity

Waste Prevention, reuse, recycling and disposal of waste

Ecology Impact on ecological receptors


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Discipline Effect

Landscape and visual

Impact on landscape and visual amenity

Heritage and archaeology

Setting of assets


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Chapter 20Twenty CONCLUSIONS

20.1 The overall conclusion of this Environmental Statement is that there will be very few significant adverse environmental effects resulting from implementation of this Scheme that cannot be mitigated. These residual likely significant effects are indicated in Table NTS3 below:

Table NTS3: Likely Residual Effects Assessment Summary

Topic Residual Effects Cumulative Residual Effects

Noise and Vibration

The scheme is not expected to have any significant adverse effects.

It is possible that piling during the construction of Kingmoor North will have an adverse effect on noise sensitive receivers to the north of the Site. This may be significant, although the cumulative effect would be dominated by the piling noise from Kingmoor Park North. No other significant adverse cumulative effects are expected.

Landscape and Visual

There is expected to be a moderate adverse (and thus significant) effect on Dee Terraces LCA throughout the life of the Scheme. There is also expected to be a moderate adverse (significant) effect to visual receptors 13 (PRoW 25 (footpath) including Cornish Hall and Holt Lodge), 18 (PRoW 24 (footpath) and residences at Aldersey Farm), 19 (Residences and vehicular users on Ridley Wood Road and B5130) and 20

When considered cumulatively with Kingmoor Park North, there is expected to be a major adverse effect on visual receptors 19 and 20 during both construction and operation. Kingmoor Park North is closer to these receptors than the Power Station Complex, so it is considered that the majority of the major adverse effect is attributable to that scheme.


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Topic Residual Effects Cumulative Residual Effects

(Residences at Marshley Farm and along the B5130) during construction and operation due either to their proximity to the Power Station Complex Site or to the openness of intervening land. No other significant adverse effects are expected.

20.2 When these residual likely significant effects are balanced against the benefits of the Scheme, most notably the need for gas electricity generation and the socio-economic benefits, the long-term effects of the Scheme are considered to be positive.

20.3 Consequently, and given the consistency of the proposed Scheme with National Policy Statements, Welsh national policy, the Local Plan and other material considerations, as set out in the separate Planning Statement (Document Reference: 5.2), it is concluded that the Scheme is acceptable in environmental terms.


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Chapter 21Glossary

Full Text Acronym Notes

Above Ground Installation

AGI Compound where the infrastructure (pipes, valves and kiosk) is located which is required to connect the Gas Connection to the high pressure gas National Transmission System (‘NTS’).

AGI Site - The land on which the AGI will be located.

Above Ordnance Datum

AOD Height of land surface above sea level.

Agricultural land classification

ALC A nationally consistent and recognised method for assessing the potential productiveness of agricultural land.

Air Cooled Condenser A direct dry cooling system where the steam is condensed and returned condensate to the boiler without water loss. Situated within the Power Station Complex.

Area of Outstanding Natural Beauty

AONB A landscape designation protected under the Countryside and Rights of Way Act, 2000

Air Pollution Information System

APIS An information system that provides a comprehensive source of information on air pollution and the effects on habitats and species.

Air Quality Limit Value Regulations 2010

UK regulations to limit the levels of air borne pollutants emitted from industries.

Air Quality Management Area

AQMA An area designated by a local authority as being at risk of not meeting air quality standards

Air Quality Management Plan

AQMP A plan developed to improve the air quality in the air quality management area.

Air Quality Modelling and Assessment Unit

AQMAU An Environment Agency team that targets air quality related issues.

Air Quality Modelling and Risk Assessment Team

AQMRAT An NRW team that targets air quality related issues

Air Quality Strategy AQS The AQS for England, Scotland, Wales and Northern Ireland provides details of national air quality standards and objectives for a number of local air pollutants.


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Air Quality Technical Advisory Group

AQTAG The joint Environment Agency, Natural England and Natural Resource Wales group. AQTAG was established in 2000 by the agency’s Habitats Directive Project to provide technical guidance on the assessment of air emissions from IPC/IPPC processes.

Ancient Woodland - A woodland that has existed continuously since 1600 or before.

Annual Average Daily Traffic

AADT Measurement unit for the total volume of vehicle traffic to indicate how busy the road is.

Annual mean (Air Quality)

- The average of concentrations measured for a pollutant for one year (usually a calendar year, from January to December). Sometimes it may be reported for a pollution year (April to March) which avoids splitting a winter season, useful for pollutants with higher concentrations during the winter months.

Application - The DCO application for the Power Station Complex Site made to the Secretary of State under the Planning Act 2008.

Applications: Prescribed Forms and Procedure Regulations

APFP The Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 which prescribe various matters in connection with the making of an application for development consent under the Planning Act 2008.

Asbestos Containing Material

ACM Any material containing more than 1% asbestos.

Automatic Traffic Count

ATC Means of determining traffic levels in the vicinity.

Automatic Urban and Rural Network

AURN Air quality monitoring site.

Baseline - The conditions that exist without a proposed development at the time an assessment or survey is undertaken.

Bat Conservation Trust BCT Voluntary organisation which provides advice and guidance relating to bats.

Below Ground Level Bgl A measure unit of distance below ground.

Best Available Technique

BAT The most effective and advanced stage in the development of activities and their methods of operation which indicates the practical suitability of particular techniques for providing the basis for emission limit values


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and other permit conditions designed to prevent and, where that is not practicable, to reduce emissions and the impact on the environment as a whole.

Best and most versatile

BMV Land in grades 1, 2 and 3a of the Agricultural Land Classification

Biodiversity Action Plan

BAP Plan concerned with the protection of identified species and habitats.

Best Practical Means BPM Reasonably applied means that balance best practice against practical constraints.

British Geological Survey

BGS The UK public body responsible for all aspects of geoscience.

British Society of Soil Science

BSSS A professional society that aims to advance the study of soil.

BS 4142 - Method for Rating Industrial Noise Affecting Mixed Residential and Industrial Areas (2014).

BS 8233 - Guidance on sound insulation and noise reduction for buildings (2014).

BS 5228 - Code of Practice for Noise and Vibration Control on Construction and Open Sites 2009 (2009).

Cadw The Welsh Government's historic environment service. Cadw is a Welsh word meaning ‘to keep’ or ‘to protect’.

CAoL Guidance - Department of Communities and Local Government guidance ‘Planning Act 2008: Guidance related to procedures for the compulsory acquisition of land’ (September 2013).

Calculation of Road Traffic Noise

CRTN Department for Transport Memorandum, Calculation of Road Traffic Noise 1988

Carbon Dioxide CO2 A primary greenhouse gas emitted through human activities as well as natural sources.

Carbon Monoxide CO One of the combustion products discharged by CCGT power stations.

Chamber of Commerce CoC A network of businesses to represent local business interests.

Civil Aviation Authority CAA A statutory corporation that oversees and regulates civil aviation in the UK.


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Classified Turning Counts

CTC Measurement of vehicle traffic in particular at junctions.

Coal Authority - A non-governmental body that manages coal mining operations and coal reserves throughout the UK.

Construction Industry Research and Information Association

CIRIA A member-based research and information organisation serving the construction industry

Code of Construction Practices

CoCP A guidance document that sets out standards and procedures for managing environmental impact of constructing major schemes.

Combined Cycle Gas Turbine

CCGT A form of power station that uses an efficient combination of gas and steam turbines to generate electricity.

Combined Heat and Power

CHP A means of using waste heat generated by power station e.g. through a local heat distribution network.

Chartered Institute of Ecology and Environmental Management

CIEEM Professional body governing ecology/ecologists prior to chartership in 2013 the body was known as IEEM and publications refer to this.

Chartered Institution of Highways and Transportation

CIHT IHT is a professional body for transport professionals.

Commercial and Industrial waste

C&I Both commercial waste and industrial waste are defined by s75 of the Environmental Protection Act 1990. Commercial waste means "waste from premises … used wholly or mainly for the purposes of a trade or business or the purposes of sport, recreation or entertainment excluding … household waste; …industrial waste and [waste prescribed as being excluded by the Secretary of State]". Industrial waste means "waste from any of the following premises - … any factory… any premises used for the purposes of, or in connection with, the provision to the public of transport services by land, water or air …any premises used for the purposes of, or in connection with, the supply to the public of gas, water or electricity or the provision of sewerage services… any premises used for the purposes of, or in connection with, the provision to the public of postal or telecommunications services; or … any mine or quarry or any premises used for agriculture within the meaning of the Agriculture Act 1947".


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Common Bird Census CBC A standardised methodology to map breeding bird territories.

Construction, demolition and excavation waste

CDEW A type of construction waste as identified by the Natural Resource Wales

Committee on the Medical Effects of Air Pollutants

COMEAP An advisory body that advises the UK government on all matters concerning the health effects of air pollutants.

Conceptual Site Model CSM A model that identifies the possible pathways by which a contaminant from a particular source can affect a particular receptor.

Conservation Areas CA An area of special architectural and historic interest designated by the local planning authority pursuant to the Planning (Listed Building and Conservation Areas) Act 1990.

Construction Stage - The construction stage of the Scheme begins with enabling works, which will include site set-up and groundworks. Following this, construction of the Power Station Complex Site, and Gas Connection will be undertaken, followed by commissioning.

Construction and Demolition Waste

C&D A type of construction waste.

Construction Environmental Management Plan

CEMP A plan describing how the environmental impacts of the construction activities of a project will be minimised and mitigated that is submitted to the relevant planning authority for approval.

Construction Traffic Management Plan

CTMP A plan for managing construction traffic that is submitted to the relevant Highway Authority for approval

dB(A) - A-weighted decibel – a correction applied to each frequency between 20 Hz and 20 kHz that effectively represents the way the human ear works.

Decibel dB Logarithmic scale for measuring sound levels.

Decommissioning Stage

- Following the end of its operational life, the Power Station Complex would be decommissioned and will revert to open bare ground. The Gas Connection will be purged of gas and is likely to be left in-situ in order to avoid the adverse environmental effects associated with its removal.


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Dee Valley Water A water supply company that covers North East Wales and the North West of England.

Department for Education and Skills

DfES Government department responsible for education and children’s services.

Department of Energy and Climate Change

DECC Government department responsible for energy policy

Department for Environment, Food and Rural Affairs

DEFRA Government department responsible for environmental protection, food production and standards, agriculture, fisheries and rural communities.

Department for Transport

DfT Government department with responsibility for certain areas of transport policy in Wales that have not been devolved.

Deposition - The main pathway for removing pollutants from the atmosphere, by settling on land.

Design Manual for Roads and Bridges

DMRB A suite of technical documents produced by the Highways Agency (as was) that include guidance for environmental appraisal that are also used for non-highways schemes and as such are commonly used in EIA.

Determinand - A substance or parameter that is determined analytically, e.g. arsenic concentration in soil, pH of water, concentration of a particular gas in air quality modelling.

Development Consent Order

DCO An Order made under the Planning Act 2008 granting development consent for a Nationally Significant Infrastructure Project

Electrical Connection - The Electrical Connection is not part of the Application for the Scheme, but will be required for the export of electricity. A number of realistic assumptions have been made regarding the electrical connection works as set out below:

• The Electrical Connection is likely to consist of underground cabling between the Scheme’s electrical switchgear located within the Power Station Complex and the existing Marchwiel substation, located on Abbey Road on the Wrexham Industrial Estate.

• The wider existing electrical distribution network will also need upgrading to accommodate the new generation. This is likely to consist of works to the existing Marchwiel substation, re-stringing of existing pylons between Legacy and Wrexham substations, replacement of the existing portal frame towers between Legacy and


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Marchwiel substations, and laying of underground cables. Once completed the electrical network which currently serves the Wrexham Industrial Estate will have increased capacity and resilience from that which exists presently.

Electricity Market Reform

EMR UK government's policy to reform the electricity market. The policy aims to deliver low carbon energy and reliable supplies for the UK, while minimising costs to consumers.

Electric and Magnetic Fields

EMF EMFs comprise electric and magnetic fields. Electric fields are the result of voltages applied to electrical conductors and equipment. Magnetic fields are produced by the flow of electric current.

Emission - The direct or indirect release of substances, vibrations, heat or noise from individual or diffuse sources into air, water or onto land, e.g. pollution may be discharged into the atmosphere from a stack or vent.

Emission Limit Value ELV Legal enforcement limit on the physical, chemical or biological characteristics of a point source of emission to water or air.

Energy Efficiency Directive 2012

- Directive 2012/27/EU establishes a framework of measures for the promotion of energy efficiency within the European Union.

Environmental Health Officer

EHO A local authority health professional responsible for carrying out measures for protecting public health.

Environmental Impact Assessment

EIA The process of assessing the likely significant environmental impacts of a proposed project as part of gaining planning consent.

Environmental Permit EP A permit required in accordance with the Environmental Permitting Regulations.

Environmental Permitting Regulations

EPR The Environmental Permitting (England and Wales) Regulations 2010 regulate practices that have pollution potential through a permitting system.

Environmental Protection Act 1990

EPA The Act that covers, amongst other things, the regulation of contaminated land in the UK.

Environmental Protection UK

EPUK UK environmental Non-Governmental Organization (NGO) working to improve the quality of the local environment

Environmental Quality Standards

EQS The concentration of a particular pollutant or group of pollutants in water, sediment or biota which should not be exceeded in order to protect human health and the


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environment.

Environmental Statement

ES The document which reports the process, findings and recommendations of the EIA.

Environmentally Sensitive Area

ESA A designation for agricultural areas needing special protection by virtue of their landscape, wildlife or historical value.

Flood Defence Consent FDC A consent required by Natural Resources Wales, for construction or maintenance work on over, under or near a main river (usually within 8-10 metres).

Flood Risk Assessment or Flood Consequence Assessment

FRA or FCA An assessment that determines the risk of flooding to a proposed project.

Full Time Equivalents FTE The equivalent number of full time jobs provided by a project - e.g. two half-time jobs equates to one FTE.

Gas Connection - This element comprises all the equipment required to connect the Power Station Complex to the National Transmission System, including the Gas Pipeline and the Above Ground Installation. This is being separately consented under the TCPA 1990 though it forms part of the Scheme that has been environmentally assessed through the EIA. The Gas Connection forms part of the Order Land.

Gas Connection Route The route within which the Gas Connection is situated together with the temporary construction working areas.

Gas Pipeline - A continuously welded underground steel pipe with a nominal bore of up to 400mm.

Gas Turbine GT A turbine driven by hot combustion gases at high temperature.

Great Crested Newt GCN A species of newt protected by European Legislation.

Greenhouse Gas GHG An atmospheric gas such as carbon dioxide, methane, chlorofluorocarbon, nitrous oxide, ozone, or water vapour that slows the passage of re-radiated heat through the Earth’s atmosphere.

Gross Value Added GVA A measure of added value to the overall economy of each additional job created.

Ground Investigation GI An intrusive or non-intrusive investigation, and subsequent testing, of surface and subsurface soil and

http://www.dictionaryofconstruction.com/definition/testing.html

http://www.dictionaryofconstruction.com/definition/soil.html


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conditions. This is undertaken to obtain information on the physical and chemical properties of the soil, rock, groundwater and gas regimes at and in the vicinity of a site.

Groundwater Protection: Principles and Practice

GP3 A guidance published by the Environment Agency on Groundwater protection.

Groundwater Source Protection Zone

GSPZ Areas around groundwater abstraction sources that are defined in order to help protect drinking water from contamination.

Guidance for the Environmental Assessment of Road Traffic

GEART The IEMA guidance on the environmental assessment of road traffic.

Guidance on Transport Assessment

GTA Department for Transport guidance dated March 2007 on the preparation of Transport Assessments as archived 22 October 2014 and replaced by NPPG “Transport evidence bases in plan making”

Guidelines for Landscape and Visual Impact Assessment, 3rd Edition

GLVIA Guidance produced by the Landscape Institute and the Institute for Environmental Management and Assessment dated 17 April 2013

Habitat - A place where an organism (e.g. human, animal, plant, micro-organism) or population of organisms live, characterised by its surroundings.

Habitat Regulations Assessment

HRA An assessment required under the European Directive 92/43/EEC.

Habitat Suitability Index

HSI A method for assessing the suitability of ponds for their potential to support Great Crested Newts.

Health and Safety Executive

HSE The non-departmental government body responsible for workplace safety in the UK.

Heat Recovery Steam Generator

HRSG A means of recovering heat energy from hot exhaust gases in order to produce steam for driving a turbine.

Heavy Duty Vehicle HDV HGVs, buses and coaches.

Heavy Goods Vehicle HGV A truck that when laden has a total weight of more than 3500 kg.

Hectare ha 10,000m2 or 2.471 acres


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Highway Authority HA The relevant highway authority responsible for the non-core road network (i.e. roads other than trunk roads and motorways).

Historic Environmental Record

HER The record held by the local planning authority of known archaeological sites, buildings and landscapes of relevance to the historic environment.

Hover - An otter’s day nest or resting site.

Indices of Multiple Deprivation

IMD An index to measure deprived areas in local councils.

Industrial Emissions Directive

IED EU Directive on industrial emissions that came into force in January 2011.

Industrial Estate Road (N)

The new road which connects Wrexham Industrial Estate to the A534.

Infrastructure Planning Commission

IPC The public body that previously examined applications for development consent to build Nationally Significant Infrastructure Projects, abolished through the Localism Act 2011 with the role replaced by the Planning Inspectorate and decisions on whether or not to grant a DCO being made by the Secretary of State.

Institute of Acoustics IOA Professional body for Acoustics, Noise and Vibration professionals.

Institute of Air Quality Management

IAQM IAQM is a professional body for air quality professionals.

Institute of Environmental Management and Assessment

IEMA IEMA is a professional body for environmental professionals that provide industry guidance on many topics including EIA.

Institute of Gas Engineers and Managers

IGEM IGEM is a chartered professional body, licensed by the Engineering Council.

Integrated Pollution Prevention and Control Directive

IPPC The EU Directive (2008/1/EC) incorporated into UK law by the Environmental Permitting Regulations on prevention and control of industrial emissions. The Directive aims to achieve a high level protection of the environment through measures to prevent or, where that is not practicable, to reduce emissions to air, water and land from activities listed in Annex I of the Directive (e.g. energy industries, production and processing of metals, mineral industry, chemical industry, intensive pig and poultry


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farming, waste management, some food and drink industries etc.).

ISO 9613-2 - Acoustics- Attenuation of sound during propagation outdoors – Part 2: General method of calculation.

Joint Nature Conservation Committee

JNCC The public body that advises the UK government and devolved administrations on UK-wide and international nature conservation.

Kilovolt kV A measure of electrical potential.

Kingmoor Park Access Road

- The road leading from Bryn Lane to the Power Station Complex Site numbered Work 5 on the Works Plan and in Schedule 1 to the Order

LA10 - A-weighted noise level exceeded for 10% of the measurement period.

LA90 - A-weighted noise level exceeded for 90% of the measurement period.

LAeq - A-weighted equivalent continuous sound level.

LAmax - A-weighted maximum sound pressure level recorded over a given period.

Local Air Quality Management

LAQM The mechanism by which the Government’s air quality objectives are to be achieved.

Landscape Character Area

LCA A area of defined landscape character in Wales.

Land Plans - The plans showing the land over which it is proposed to exercise powers of compulsory acquisition or a right to use land; land in relation to which it is proposed to extinguish or suspend existing easements, servitudes and other private rights and/or impose restrictive covenants (submitted with the Application Document Reference 2.2).

LANDMAP - A landscape characterisation and assessment system used across Wales.

Large Combustion Plant Directive

LCPD European legislation to reduce acidification, ground level ozone and particles throughout Europe by controlling emissions of sulphur dioxide, nitrogen oxides and from large combustion plants in power stations.

Laydown Areas - The temporary (Work numbered 2A on the Works Plan) and temporary/permanent (Work numbered 2B on the


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Works Plans) laydown areas required for the Scheme.

The Laydown Area shown on the Works Plan and numbered Work 2A in Schedule 1 to the Order is located on the eastern side of the Power Station Complex and will be up to 3.6 ha in size. It will be used during construction of the Scheme only.

The Laydown Area shown on the Works Plan and numbered Work 2B in Schedule 1 to the Order is located adjacent to the south eastern corner of the Power Station Complex and will be up to 0.25 ha in size. It will be used during construction of the Scheme and for maintenance activities during operation.

Lead Local Flood Authority

LLFA The authority responsible for developing, maintaining and applying a strategy for local flood risk management in their areas and maintaining a register of flood risk assets.

Light Duty Vehicles LDV Vehicles with a weight less than 3.5 tonnes (gross weight).

Listed Building A building that has been placed on the statutory list of buildings of Special Architectural or Historic Interest and protected by the Planning (Listed Building and Conservation Areas) Act 1990.

Local Nature Reserve LNR Statutory designation for places with wildlife or geological features that are of special interest locally.

Local Wildlife Site LWS Wildlife rich sites selected for their local nature conservation value.

Made Ground - Man-made deposits artificially placed comprising a wide variety of material e.g. concrete, brick etc - typical of previously developed sites.

Maelor Gas Works - An existing above ground installation which takes gas from the NTS and distributes it via existing infrastructure.

Maelor Gas Works Access Road

- The existing road and track between the B5130 and the Maelor Gas Works, which will be used to access the Gas Connection.

Maintenance or Maintain

- Includes to the extent assessed in the Environmental Statement, inspect, repair, adjust, alter, remove, refurbish, reconstruct, replace and improve any part, but not the whole, of the authorised development and “maintaining” is to be construed accordingly

Manual for Streets MfS The guidance produced by the Department for Transport and Department for Communities and Local Government


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on road layout and balancing the needs of different road users, with a focus on residential roads, dated 29 March 2007.

Megawatts of electrical power

MWe Measurement of electrical power.

Megawatts of thermal power

MWth Measurement of thermal power.

Milligrams per normal cubic metre

mg/ Nm3 Unit of concentration of emission limit values.

Multi Agency Geographical Information for the Countryside

MAGIC A web-based mapping browser showing various geographical designations e.g. nature conservation sites, heritage sites.

Municipal Solid Waste MSW Household waste.

National Cycle Network

NCN A network of signed and promoted cycle routes across the UK.

National Grid Company

NGC National Grid's principal operations are the ownership and operation of regulated electricity and gas infrastructure networks.

National Nature Reserve

NNR Statutory designations, where places with wildlife or geological features that are significant at a national level.

Natura 2000 sites - A network of European designated sites including Special Protection Areas (designated under Directive 2009/147/EC) and Special Conservation Areas as listed in Annex I and II of the EU Directive 92/43/EEC (“Habitats Directive”)

Natural Resources Wales

NRW NRW is a Welsh Government Sponsored Body, created in 2013, which took over the work of Countryside Council for Wales, Environment Agency Wales and Forestry Commission Wales.

National Policy Statements

NPS Statement of planning policy concerning the consenting of NSIPs in the UK – designated under the Planning Act 2008. The Secretary of State must make his or her decision on an application for a DCO in accordance with a relevant NPS unless other considerations apply.

National Transmission System

NTS The strategic natural gas pipeline serving the UK.


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Nationally Significant Infrastructure Project

NSIP As defined by the Planning Act 2008, which includes within the definition of an NSIP any onshore generating station in England and Wales of more than 50 MW.

National Air Traffic Control Services

NATS The main air traffic control service provider within the UK.

Nitrate Vulnerable Zone

NVZ A designated area where land drains into and contributes to nitrate found in nitrate-polluted waters.

Nitric Oxide NO Combustion product discharged by CCGT power station

Nitrogen dioxide NO2 Combustion product discharged by CCGT power station

Oxides of nitrogen NOx Comprises mainly NO and NO2, combustion products discharged by CCGT power stations.

Noise Sensitive Receptor

NSR Receptors principally residential dwellings (existing or for which planning consent is being sought/ has been given) and any building used for long term residential purposes (such as a nursing home).

Non-Road Mobile machinery

NRMM Construction vehicles or plant which are transported to site on low loaders as they are not suitable for driving on roads.

Non-Technical summary

NTS The non-technical summary of the Environmental Statement.

North & Mid Wales Trunk Road Agent

NMWTRA NMWTRA is responsible on behalf of Welsh Government for managing the strategic road network in North and Mid Wales

Okta - A unit used in expressing the extent of cloud cover, equal to one eighth of the sky.

Operation - The routine day to day functioning of the Scheme, including Maintenance activities.

Order - The Wrexham (Gas Fired Power Station) Order, being the Development Consent Order which has been applied to be made by the Secretary of State authorising the Power Station Complex Site, a draft of which is submitted with the Application (Document Reference 3.1)

Order Land - The land as shown on the Land Plans (Document Reference 2.2) within which the Scheme may be carried out.


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Order Limits - The limits shown on the Works Plans (Document Reference 2.3) within which the Power Station Complex Site may be carried out.

Ordnance Survey OS National mapping agency for Great Britain

Overhead Line OHL Network of overhead electricity distribution and transmission lines

Part II A - The section of EPA 1990 that deals with contaminated land.

Annual Average Flow Rate for surface water runoff

QBAR -

Particulate Matter PM Very small solid or liquid particles.

Pathway - The route by which contamination moves from a source to a given receptor.

Peak Particle Velocity PPV A term used to measure vibration through a solid surface. When a vibration is measured, the point at which the measurement takes place can be considered to have a particle velocity.

Percentage Heavy Goods Vehicles

%HGV Percentage of traffic that is classified as Heavy Goods Vehicles over a given period.

Percentile - A value below which that percentage of data will either fall or equal. For instance, the 98th percentile of values for a year is the value below which 98% of all of the data in the year will fall, or equal.

Permitted Development

- Development that is deemed under legislation to have planning consent without the need to obtain planning permission.

Personal Protective Equipment

PPE Equipment a person may wear to protect themselves from risks e.g. high-visibility jackets, gloves, steel toe capped boots.

Pipeline Inspection Gauge

PIG Pipeline inspection and cleaning device.

Planning Act 2008 PA 2008 England and Wales legislation which established the legal framework to apply for, examine and determine applications for Nationally Significant Infrastructure Projects.


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Planning Inspectorate PINS Executive agency supported by the Department for Communities and Local Government which deals with planning appeals, national infrastructure, planning applications, examinations of local plans and other planning related and specialist casework in England and Wales.

Planning Policy Wales PPW Overarching land use planning policy for Wales, produced by the Welsh Government (edition 8, January 2016).

Pollution Prevention Guidance

PPG Environment Agency published guidance on pollution prevention and best practice

Potential Contaminant Linkages

PCL The existence of a contamination source and a receptor where a pathway is also present linking the two.

Power Station Complex

- The power generating element of the Scheme including gas turbine building, Stack(s), HRSG(s), transformers, steam turbine building, admin/control building, heat interface building, pressure regulation installation, water tanks, car parking, internal site roads, workshop, water treatment plant, switchyard, switchgear room and surface and foul water drainage (please refer to Works numbered 1A to 1G in Schedule 1 to the Order).

Power Station Complex Site

The Power Station Complex, Laydown Areas, surface water drainage, landscaping and ecological mitigation, (Works numbered 1, 2, 3, 4 and 5 in Schedule 1 to the Order and as shown on the Works Plan).

Preliminary Environmental Information Report

PEIR A report describing the preliminary environmental assessment during the pre-application process of an NSIP.

Pressure Regulating Installation

PRI Part of the Power Station Complex where the gas is received from the Gas Connection. The PRI conditions the gas before use in the gas turbine(s)

Previous Scheme The scheme proposed by WPL in 2011, for a power station with a generating capacity of up to 1,200 MWe detailed in the Previous Scoping Report and which has been superseded by the Scheme which is the subject of the Application.

Previous Scoping Opinion

The Scoping Opinion issued by the Secretary of State in January 2013.


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Previous Scoping Report

The Scoping Report submitted by WPL to the Secretary of State in November 2012.

Public Right of Way PRoW Paths on which the public have legally protected rights to pass.

Ramsar site A designation for wetlands of International importance.

Receptor - An identified aspect of the environment - e.g. a resident, protected species, heritage asset, controlled water etc - that may be affected by the Scheme and, as such, has been assessed as part of the EIA undertaken.

Registered Parks and Gardens

Gardens and designed landscapes of special architectural and historic importance, placed on a register by Cadw.

Remediation - The clean-up of contaminated soil to make it suitable and safe for future use.

River Basin Management Plan

RBMP A management tool created by Natural Resources Wales to use for integrated water resources management.

Rochdale Envelope - The Rochdale cases provide the basis upon which a project can be described by a series of maximum extents – the ‘worst case’ scenario - allowing the detailed design of the scheme to vary within this ‘envelope’ without invalidating the corresponding EIA. This envelope has been assessed in the EIA for the Scheme.

Scheduled Monument SM A "nationally important" archaeological site or historic building, protected under the Ancient Monuments and Archaeological Areas Act 1979.

Scheme (also referred to as the "WEC")

- The construction, operation, maintenance and eventual decommissioning of the Power Station Complex Site (Work numbered 1-5 in Schedule 1 to the Order) and the Gas Connection.

Scoping Opinion - The Scoping Opinion provided by the Secretary of State in May 2014 and included in the Appendices to the Environmental Statement (Document Reference 6.4, Appendix 5.1).

ScottishPower Electricity Networks or SP Manweb plc

SPEN Company which operates the electrical distribution network in the North Wales and Cheshire area.

Secretary of State SoS The decision maker for a NSIP application and head of the relevant government department. In the context of the Application the decision maker is the Secretary of State for


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Energy and Climate Change.

Site (also referred to as the "WEC Site")

- The area in which the Scheme will be constructed, operated and decommissioned as defined by the Order Land.

Site of Nature Conservation Interest

SNCI Non-statutory areas of local importance for nature conservation.

Site of Special Scientific Interest

SSSI A geological or biological conservation designation denoting a protected area in the UK.

Site Waste Management Plan

SWMP The strategic document dealing with the effective management of materials used for the construction and the operation of the Scheme ensuring that waste is considered at all stages of the Scheme. The SWMP will form part of the CEMP for the Scheme.

Spraint - Otter Faeces

Soil Framework Directive 2006

SFD Proposed Directive (proposal withdrawn in 2014) to promote the sustainable use of soil and protect soil as a natural resource.

Sound Power Level SWL The Sound Energy flow per unit of time.

Sound Pressure Level SPL Logarithmic measure of the sound pressure of a sound relative to a reference value, the threshold of hearing.

Special Area of Conservation

SAC Area of protected habitats and species as defined in the European Union's Habitat Directive (92/43/EEC).

Special Landscape Areas

SLA Local designation to provide protection for locally significant and attractive landscapes.

Special Protection Area SPA A designated area for birds under the European Union Directive on the Conservation of Wild Birds (2009/147/EC)

Stack(s) - The structure by which the exhaust gases and waste heat from the Power Station Complex will be emitted to the atmosphere during Operation.

Statement of Community Consultation

SoCC A statement describing how an applicant proposes to consult the local community about a project.

SuDs Approval Body SAB -

Sulphur Oxides SOx One of the combustion products discharged by CCGT power stations.


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Sustainable Drainage Systems

SuDS Water management practices and facilities that drain surface water more sustainably than the conventional practice of routing run-off through a pipe to a watercourse.

Switchgear - The combination of switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Can be air-insulated or gas-insulated.

Technical Advice Notes TAN Technical Advice Notes produced by the Welsh Government which provide detailed planning guidance on technical issues.

Tonnes per annum tpa Unit for measuring waste produced.

Town and Country Planning Act 1990

TCPA 1990 The Act which consolidates certain enactments relating to town and country planning (excluding special controls in respect of buildings and areas of special architectural or historic interest and in respect of hazardous substances)

Transport Analysis Guidance

TAG Guidance from the Department for Transport on how to assess transportation schemes first published on 29 October 2013 and last updated on 10 November 2014.

Tree Preservation Order

TPO A written order made by the local authority which makes it an offence to intentionally damage or remove a tree protected by that order without the authority's permission.

Urban Wastewater Treatment Directive

- A European Directive to protect the environment from the adverse effects of urban waste water.

Waste (England & Wales) Regulations 2011

- Legislation for waste prevention, management and introduction of waste hierarchy.

Waste Framework Directive

WaFD The Waste Framework Directive is a European Union Directive which requires all EU states to take the necessary measures to ensure waste is recovered or disposed of without endangering human health or causing harm to the environment. It has been transposed to the Waste (England & Waste) Regulations in 2011.

Water Framework Directive

WFD The Water Framework Directive is a European Union directive which commits EU member states to achieve good qualitative and quantitative status of all water bodies by 2015.

Water Resources Act WRA Legislation to prevent and minimise pollution of water.


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1991

Welsh Government - Welsh Government is the devolved Government for Wales with responsibility for the economy, education, health, planning, and other policy areas.

Welsh Water Supplies wastewater services within the Scheme area.

Weighted Sound Reduction Index

Rw Single-number quantity which characterises the airborne sound insulation of a material or building element over a range of frequencies when tested in a laboratory.

Wildlife and Countryside Act 1981

Legislation which protects animals, plants and certain habitats in the UK.

Wrexham Energy Centre (also referred to as the "Scheme")

WEC The construction, operation, maintenance and eventual decommissioning of the Power Station Complex Site (Work numbered 1-5 in Schedule 1 to the Order) and the Gas Connection.

WEC Site (also referred to as the “Site”)

- The area in which the Scheme will be constructed, operated and decommissioned as defined by the Order Land.

Wrexham County Borough Council

WCBC The unitary authority area within which the Scheme is located

Wrexham Industrial Estate

WIE The substantial industrial estate to the east of Wrexham within which the Power Station Complex Site will be located.

Wrexham Power Limited

WPL The applicant and developer of the Scheme.

World Health Organisation

WHO A United Nations agency concerned with public health.

Works Plan - The plan showing the Power Station Complex Site and the limits (and limits of deviations) within which the Power Station Complex Site may be carried out (Document Reference 2.3).

Zone of Theoretical Visibility

ZTV A computer generated plan showing a maximum area of the surroundings within which a project could theoretically be viewed.

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