Tidal Lagoon Swansea Bay Plc
Tidal Lagoon Swansea Bay Town & Country Planning Act 1990 (as amended) 275kV Cable Route – Planning Application TLSB Environmental Statement Addendum November 2016
www.tidallagoonswanseabay.com Tidal Lagoon Swansea Bay Plc
Document title TLSB 275kV ES Addendum Document reference TLSB-TCPA-275 Cable Route-ES Addendum- Nov 16-1.0 Revision number 1.0 Date 17/11/2016
Version history Revision Date Description Author(s) Reviewer(s) Approval 1.0 17/11/2016 Draft 275kV ES RH FC Addendum
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Table of Contents
1 Introduction ...... 5 1.1 The Project ...... 5 1.2 Purpose and scope ...... 5 1.3 Structure ...... 7 2 Site selection option and appraisal ...... 8 2.1 Overview...... 8 3 Planning and Policy Context ...... 9 3.1 Introduction ...... 9 3.2 Neath Port Talbot County Borough Council (NPTCBC) Local Development Plan ...... 9 4 Coastal processes, sediment transport and contamination ...... 11 4.1 Introduction ...... 11 4.2 Assessment of impacts ...... 11 5 Marine water quality ...... 12 5.1 Introduction ...... 12 5.2 Assessment of impacts ...... 12 6 Intertidal and subtidal benthic ecology ...... 13 6.1 Introduction ...... 13 6.2 Assessment of impacts ...... 13 7 Fish including recreational and commercial fisheries ...... 14 7.1 Introduction ...... 14 7.2 Assessment of impacts ...... 14 8 Marine mammals ...... 17 8.1 Introduction ...... 17 8.2 Assessment of impacts ...... 17 9 Coastal birds ...... 18 9.1 Introduction ...... 18 9.2 Assessment of impacts ...... 18 10 Terrestrial ecology ...... 19 10.1 Introduction ...... 19 10.2 Assessment of impacts ...... 19 10.3 Crymlyn Burrows SSSI ...... 19 10.4 Bare ground, ephemeral and short perennial vegetation...... 20 10.5 Fabian Way Conservation Verge ...... 21
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10.6 Reptiles ...... 21 Environmental Management Requirements ...... 21 Delivery Strategy ...... 21 Crymlyn Burrows SSSI 275 kV cable route: Habitat manipulation ...... 22 Crymlyn Burrows SSSI 275 kV cable HDD reception pit: Habitat manipulation ...... 22 10.7 Terrestrial Invasive Non Native Species (INNS) ...... 24 10.8 275 kV CEMP ...... 24 11 Seascape and landscape visual impact assessment ...... 25 11.1 Introduction ...... 25 11.2 Assessment of impacts ...... 25 12 Navigation marine transport assessment ...... 26 12.1 Introduction ...... 26 12.2 Assessment of impacts ...... 26 13 Onshore transport assessment ...... 27 13.1 Introduction ...... 27 13.2 Assessment of impacts ...... 27 14 Air Quality ...... 29 14.1 Introduction ...... 29 14.2 Assessment of impacts ...... 29 15 Hydrology and flood risk ...... 30 15.1 Introduction ...... 30 15.2 Assessment of impacts ...... 30 16 Land quality and hydrogeology ...... 31 16.1 Introduction ...... 31 16.2 Assessment of impacts ...... 31 17 Noise and vibration ...... 33 17.1 Introduction ...... 33 17.2 Assessment of impacts ...... 33 18 Cultural heritage marine archaeology ...... 35 18.1 Introduction ...... 35 18.2 Assessment of impacts ...... 35 19 Cultural heritage terrestrial archaeology and historic landscape ...... 36 19.1 Introduction ...... 36 19.2 Assessment of impacts ...... 36 20 Economy, tourism and recreation ...... 39 20.1 Introduction ...... 39 20.2 Assessment of impacts ...... 39
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21 Appendix A – 275kV Cable Route Corridor...... 40
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1 Introduction
1.1 The Project
1.1.1 Tidal Lagoon Swansea Bay (TLSB) will be the world’s first purpose built tidal energy lagoon. The generating station will have an installed capacity of 320 Mega Watts (MW) and will enclose part of Swansea Bay, from the eastern side of the River Tawe to the eastern edge of the Swansea University Bay-Campus.
1.1.2 TLSB made an application for development consent to the Planning Inspectorate on 7 February 2014 for a Development Consent Order (DCO). Examination of the application closed on 10 December 204 and development consent was granted by the Secretary of State (SoS) on 9 June 2015.
1.1.3 A number of elements were excluded from the DCO which included the provision of the 275kV underground electricity cable from the Western Landfall of the TLSB development to the Baglan Bay National Grid substation. A separate Town and Country Planning Act 1990 (TCPA) application is therefore being sought for the 275kV underground electrical grid connection works (the 275kV Project).
1.1.4 The 275kV high voltage cable and associated trenching works will run through the access road, along Fabian Way, through Crymlyn Burrows before crossing the Neath river to connect to the National Grid Transmission System via the Baglan Bay substation. The cable route corridor is illustrated in Appendix A. Further detailed drawings of the cable route are also provided as part of the application.
1.1.5 The works associated with this planning application form a critical part of the wider TLSB Project which comprises the construction, operation and maintenance of a tidal lagoon generating station, located in Swansea Bay, South Wales.
1.2 Purpose and scope
1.2.1 As part of the wider TLSB Project, TLSB undertook an Environmental Impact Assessment (EIA) in accordance with the requirements of the Infrastructure Planning (Environmental Impact Assessment) Regulations 2009 (the ‘EIA Regulations’). The EIA formed part of the Environmental Statement (ES) (TLSB ES 2014) for the wider TLSB Project. This ES was publicised and consulted upon as part of the application made to the Planning Inspectorate on 7 February 2014 for a DCO. The application was examined by the Planning Inspectorate during a six month examination of the TLSB Project.
1.2.2 The EIA for the TLSB Project involved the collection and compilation of detailed information about the likely main environmental effects of the TLSB Project. This included as assessment of the potential effects that may result from the TLSB Project during construction, operation and decommissioning phases. Direct and indirect impacts, cumulative effect, short, medium and long term impacts, those impacts that were considered both permeant and temporary and those impacts that were considered to be beneficial or adverse in nature were all considered and
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assessed as part of the EIA for the TLSB Project. Full details of the EIA process undertaken including the identification key receptors are provided within Chapter 2 of the ES (TLSB 2014).
1.2.3 The EIA process undertaken for the TLSB Project considered all realistic and likely worst case variations of the TLSB Project. The EIA undertaken was based on the TLSB Project in its entirety including, but not limited to; the energy generating elements, public realm facilities and the 275kV grid connection. A full description of elements considered as part of the Project is provided within Chapter 4 of the ES (TLSB 2014). The EIA was informed by the review of relevant available data and through the undertaking of environmental surveys. The data reviewed and surveys undertaken were based on the TLSB Project in its entirety and covered the whole TLSB Project area.
1.2.4 As discussed in Section 1.1, the provision of the 275kV grid connection from the Western Landfall of the TLSB development to the Baglan Bay National Grid substation was excluded from the DCO. A separate TCPA application is therefore being sought which will seek permission for the 275kV electrical grid connection works (the 275kV Project). This Addendum to the TLSB ES (TLSB 2014) has been prepared by TLSB Plc to support that TCPA planning application.
1.2.5 This Addendum provides details of the likely environmental impacts that are specific to the 275kV Project alone. It considers the realistic and likely worse case environmental effects associated with the construction and operation of the 275kV Project.
1.2.6 The assessment presented within this Addendum is based on the environmental information and surveys presented within the TLSB ES (TLSB 2014). The desktop studies and environmental surveys which informed the EIA for the TLSB Project and this Addendum were undertaken between 2012 and 2013. No new environmental surveys have been undertaken specifically for the purpose of the TCPA planning application. However, a new desk top stud in relation to ground contamination was undertaken in 2016. Further details on this can be found in Section 16 of this Addendum.
1.2.7 TLSB consider this approach to be appropriate for the following reasons:
• The assessment is based on a likely worst case scenario and therefore any management and/or mitigation measures proposed are precautionary; and
• The timings of the proposed works. The installation of the 275kV is associated with the construction programme for the wider TLSB Project and will therefore not commence until 2018. Any surveys therefore undertaken for the current application will require further update prior to construction.
1.2.8 TLSB recognise the need for environmental surveys to be based on up to date environmental information. TLSB will therefore undertake environmental surveys relevant to the grid connection works prior to construction of the 275kV Project commencing. This will ensure that any material changes in circumstance since the original surveys were undertaken are accounted for and should any new significant
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environmental impacts be identified that these are appropriately managed and/or mitigated.
1.2.9 A draft 275 kV Construction Environmental Management Plan (CEMP) has also been produced to support this TCPA planning application. The 275 kV CEMP details the measures required to manage and where necessary, mitigate the environmental effects of the construction of the installation of the 275 kV cable. The management and mitigation measures proposed are based on a precautionary approach. A separate TLSB Project wide CEMP has been produced, provided under Development Consent Order (DCO) Requirement 5, for the wider TLSB Project, including offshore elements.
1.3 Structure
1.3.1 The following sections of this Addendum presents an overview of each environmental topic which was presented in the ES that was produced for the TLSB Project (TLSB ES 2014). Where relevant, a summary of the baseline information obtained and key environmental surveys undertaken is provided followed by a conclusion on any likely siginificant effects as a result of the 275kV Project. The assessment presented is based on a precautionary worst case scenario and where relevant, each section provides details of the appropriate management and mitigation measures that will be adopted. Full details of any management and mitigation measures are detailed within the 275 kV CEMP produced to support this application.
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2 Site selection option and appraisal
2.1 Overview
2.1.1 During the development of the TLSB Project, the grid connection was a key consideration and the proposed cable route evolved significantly during the design phase of the design phase of the TLSB Project. Some factors which influence the grid connection include:
• The generation capacity of the TLSB Project and the proximity of a suitable substation connection point;
• The presence of a landfall to minimise marine works; and
• Options to minimise impacts on the surrounding environment through use of existing brownfield/linear development routes versus previously undeveloped land.
2.1.2 Table 3.1 of Chapter 3 of the TLSB ES (TLSB ES 2014) summarises the key stages of development of the grid connection and details the rationale behind the design iterations. The cable route corridor presented in Appendix A of this Addendum shows the final chosen route corridor for the underground grid connection.
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3 Planning and Policy Context
3.1 Introduction
3.1.1 The following section provides details of relevant policy where there are updated or new policy considerations since the production of the TLSB ES (TLSB ES 2014). Such policy should be considered in the determination of this TCPA application for the 275kV underground electricity cable which is associated with and an integral part of the wider TLSB energy generating station Project.
3.2 Neath Port Talbot County Borough Council (NPTCBC) Local Development Plan
3.2.1 The Local Development Plan (2011-2026) (LDP) was adopted in January 2016 and sets out the policies used for the determination of planning applications, as well as presenting policies and proposals directing future development.
3.2.2 Strategic Policy SP1 seeks to address the causes of climate change by, inter alia, making provision within the County Borough for an appropriate contribution to renewable and low-carbon energy generation. The supporting text confirms that climate change is an “overarching matter” to be addressed by all topic areas within the LDP.
3.2.3 Strategic Policy SP5 “Development in the Coastal Corridor Strategy Area” defines an area within which sustainable growth and development will be promoted to benefit the area whilst protecting and enhancing the area’s character and environment. It specifies area-specific measures, which includes the development of the University Campus at Fabian Way.
3.2.4 Policy CCUC1 “Coastal Corridor University Campus” allocates land to develop the University campus at Fabian way.
3.2.5 Policy EN1 “The Undeveloped Coast” protects the designated undeveloped coast are from development that unnecessary and where such development cannot be accommodated without
3.2.6 Policy TO4 “Walking and Cycling Routes” identifies key walking and cycling routes in the County Borough and resists development that would prevent or have any adverse impact on their implementation.
3.2.7 Strategic Policy SP15 “Biodiversity and Geodiversity” ensures that important habitats, species and sites of geological interest will be protected, conserved, enhance and managed through a range of measures, including the identification of International and National designated sites, and regional and locally important sites.
3.2.8 Policy EN6 “Important Biodiversity and Geodiversity Site” permits development that would affect Regionally Important Geodiversity Sites, Local Nature Reserves, Sites of Interest for Nature Conservation, sites meeting SINC criteria or LBAP/Sec.42 habitats provided it conserves and, where possible, enhances the importance of the
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site; and it can be demonstrated that the development could not be located elsewhere.
3.2.9 Policy EN7 “Important Natural Features” states that development that adversely affects ecologicallt or visually important natural features will only be permitted where full account has been taken of the relevant features in the design of the development and that appropriate mitigation is identified.
3.2.10 Strategic Policy SP16 “Environmental Protection” requires new development to ensure that it does not have a significant adverse effects on water, ground or air quality; to give preference to the development of brownfield land; and to ensure the exposure of people to pollution is not increased.
3.2.11 Policy EN8 “Pollution and Land Stability” states that development which is likely to have an unacceptable adverse effect on health, biodiversity and/or local amenity or would expose people to unacceptable risk will not be permitted.
3.2.12 Strategic Policy SP17 “Minerals” requires the maintaining of a minimum supply of aggregate and the safeguarding of other minerals throughout the plan period.
3.2.13 Policy M1 “Development in Mineral Safeguarding Areas” only permits development within such areas where it can be demonstrated that the mineral concerned is no longer of value; that the mineral can continue to be extracted; there is an overriding need for the development; or that the development would not have a significant impact.
3.2.14 Strategic Policy SP18 “Renewable and Low Carbon Energy” seeks to encourage all forms of appropriate renewable energy and low carbon technology development to ensure a proportionate contribution to meeting national renewable energy targets, whilst balancing impacts on the environment and communities.
3.2.15 Policy RE1 “Criteria for the Assessment of Renewable and Low Carbon Energy Development” permits renewable and low carbon energy development subject to satisfying a range of criteria which includes: the minimisation of impacts on visual amenity and the natural environment; avoiding unacceptable impacts on residential amenity; not compromising highway safety; not interfering with telecommunicat8ions and that satisfactory proposals are in place for site restoration as appropriate.
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4 Coastal processes, sediment transport and contamination
4.1 Introduction
4.1.1 An assessment of coastal processes for the TLSB Project is presented in Chapter 6 of the TLSB ES (TLSB ES 2014). Baseline conditions were determined through the collection and analysis of data from a variety of sources including but limited to geophysical, geotechnical and benthic surveys (Titan, 2012a; Atkins, 2013; Titan, 2013). The EIA was further informed by the undertaking of a numerical modelling to assess the hydrodynamic, wave, sedimentation and plume impacts from the development. For full details on coastal processes see Chapter 6 of the TLSB ES (TLSB ES 2014).
4.2 Assessment of impacts
4.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. The majority of the route is overland with a small portion which crosses the River Neath. The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
4.2.2 The cable will therefore not be laid within the riverine environment and therefore the proposed 275kV cable route does not have any effects upon coastal processes, sediment transport and contamination.
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5 Marine water quality
5.1 Introduction
5.1.1 An assessment of water quality for the TLSB Project is presented in Chapter 7 of the TLSB ES (TLSB ES 2014). The review presented in Chapter 7 makes reference to the Water Framework Directive (EC 2000/60/EC) (WFD), the Bathing Directive (EC 76/160/EEC) (BWD), and the Shellfish Water Directive (EC 2006/113/EC) (SWD), which are the principal legislative drivers for water quality assessment in coastal water around the UK. The review also considered European Union (EU) regulations pertaining to bacterial sampling of shellfish flesh, which is a key water quality indicator. For full details on water quality see Chapter 7 of the TLSB ES (TLSB ES 2014).
5.2 Assessment of impacts
5.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. The majority of the route is overland with a small portion which crosses the River Neath. The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
5.2.2 The cable will therefore not be laid within the riverine environment and therefore the proposed 275kV cable route does not have any effects upon water quality.
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6 Intertidal and subtidal benthic ecology
6.1 Introduction
6.1.1 An assessment of the likely significant effects of the TLSB Project on intertidal and subtidal benthic ecology is presented in Chapter 8 of the TLSB ES (TLSB ES 2014). For full details on intertidal and subtidal benthic ecology see Chapter 8 of the TLSB ES (TLSB ES 2014).
6.2 Assessment of impacts
6.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. The majority of the route is overland with a small portion which crosses the River Neath. The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
6.2.2 In addition, the area where the drill enters the ground will be land based. It is therefore considered that the proposed 275kV cable route does not have any effects upon intertidal and subtidal benthic ecology.
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7 Fish including recreational and commercial fisheries
7.1 Introduction
7.1.1 An assessment of the likely significant effects of the TLSB Project on fish including recreational and commercial fisheries is presented Chapter 9 of the TLSB ES (TLSB ES 2014). Site specific surveys were undertaken as part of the TLSB Project in 2013 to characterise the fish populations of the survey area.
7.1.2 For full details on fish including recreational and commercial fisheries and the results of the 2013 surveys see Chapter 9 of the TLSB ES (TLSB ES 2014).
7.2 Assessment of impacts
7.2.1 It is proposed to transmit electricity from the turbines to the substation at Baglan Bay along three single core XLPE cables (800 mm2).
7.2.2 Electromagnetic fields (EMF) are generated from the cable which may have the potential to disrupt electrosensitive and magnetosensitive fish; typically these include elasmobranchs, lamprey, eel and salmon (Gill et al., 2005). The main potential impact of any electric field would be to disrupt the sensory feeding cues of some benthic species, whilst magnetic fields may impact upon fish fauna by impairing the orientation and migratory behaviour of diadromous fish.
7.2.3 Elasmobranchs are recognised as being very sensitive to EMF stimuli. However, the location of the planned 275kV cable where it crosses the River Neath is too far upstream to be of concern for this subclass of fish.
7.2.4 Diadromous fish, such as eel, have also been shown to display avoidance to EMFs. Westerberg & Begout-Anras (2000) have shown eel display some avoidance to a subsea 130 kV AC cable. The overall delay as a result of the cable is estimated at an average of 30 minutes (owing to its effect on swimming speeds). It should be noted that these trials were conducted in fully saline conditions, where eel are likely to be using magnetic orientation and where EMFs propagate further. Within an estuary this would differ as eel are more dependent on chemical cues and EMFs propagate less due to lower conductivities.
7.2.5 Studies carried out on a 33 kV cable crossing the Clwyd estuary in North Wales have indicated elevated E fields (> 70 μV m-1). In theory, fields at these levels should have a negative effect on the movements of lamprey (as they have been shown to sense levels < 10 μV m-1). Notwithstanding this the Clwyd is well known for its population of river lamprey and salmonids (Kelly & King, 2001). This would suggest that the effect of the cables on lamprey and salmonids is restricted.
7.2.6 The 275kV cable route will cross the course of the Neath River. The cable will cross the River Neath through ducts formed by directional drilling approximately 650m in length. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys
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prior to installation. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
7.2.7 Whilst burying a cable will not affect the magnitude of the magnetic field, the field will diminish with increasing distance from the cable in direct proportion to the current (amperes) passing along the cable.
7.2.8 Electromagnetic fields produced from the cables have been modelled (see Table 9.24 of Chapter 9 of the TLSB ES (TLSB ES 2014). Results indicate that electric fields (E) will be fully contained by the shielding around the cables, whilst magnetic (B) fields will be released into the local environment, but will be limited in strength.
7.2.9 The magnetic fields produced by the cables even at 1m distance (8.3 µT) are below levels which magnetosensitive fish such as elasmobranchs are known to detect and respond to (36 µT and in the range of 25-100 µT) (Gill et al., 2005). Electromagnetic fields generated from the electrical transmission cable are therefore not expected to impact on fish fauna within the Bay (interpreted as interference with prey detection and avoidance or attraction to EMF or impede those returning to rivers.
7.2.10 The electromagnetic fields generated by from the proposed 275kV cable are therefore not considered have any likely significant effects on fish fauna within the bay or impede those returning to rivers.
7.2.11 However, to minimise any potential impact of EMF on electrosensitive and magnosensitive fish species, electric cables across the River Neath will be laid at a depth of approximately 10m where possible in a new duct installed via horizontal directional drilling. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
7.2.12 In summary, the key impacts occur during the operational phase of the 275kV Project. The source of the potential impact, the potential impact and potential effects are summarised in Tale 7.1 below:
Table 7.1 Operational impacts on fish Potential source Potential impact Potential effect(s) Mitigation
Installation of power Creation of Behavioral The ducts will aim to cables under the electromagnetic disturbance of be installed with River Neath fields (EMF) elasmobranchs and approximately 10m diadromous fish clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical
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surveys prior to installation.
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8 Marine mammals
8.1 Introduction
8.1.1 An assessment of the likely significant effects of the TLSB Project on marine mammals is presented Chapter 10 of the TLSB ES (TLSB ES 2014). To determine a baseline and inform the assessment numerous sources of data were reviewed which included a number of national and regional studies. For full details on the data sources reviewed and the marine mammal assessment see Chapter 10 of the TLSB ES (TLSB ES 2014).
8.2 Assessment of impacts
8.2.1 Marine mammals are not considered to be electrosensitive species (Hanke and Dehnhardt, 2013; Gill et al. 2005; Fisher, and Slater, 2010,). For magnetosensitive species, sensitivity to the geomagnetic field is associated with a direction finding ability e.g. migration. Gill et al (2005) lists cetaceans including the harbour porpoise as magnetosensitive. However there is no apparent evidence that existing cables have influenced migration of cetaceans. No evidence has been found to suggest that pinnipeds are magneto-sensitive (Gill et al. 2005; Murphy, 2012.).
8.2.2 Due to magnetic field strengths quickly diminishing away from a cable, potential exposure to detectable B-fields is only likely to occur within a few metres of the River Neath crossing cable.
8.2.3 Harbour porpoise are rarely recorded in the River Neath estuary with grey seal only occasionally recorded.
8.2.4 The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
8.2.5 Therefore, whilst there is a high probability of magnetic fields being generated, magnitude of change is considered to be negligible. No evidence linking magnetic fields from cables to impacts on the direction finding ability or movement of cetaceans has been found and seals are not considered magnetoreceptive. Sensitivity is therefore considered to be low. Therefore, whilst marine mammals are considered to be of high importance, there is no impact from electromagnetic fields during operation predicted.
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9 Coastal birds
9.1 Introduction
9.1.1 An assessment of the likely significant effects of the TLSB Project on coastal birds is presented Chapter 11 of the TLSB ES (TLSB ES 2014). In order to provide and ecological context for TLSB Project, ecological records were requested from the British Trust for Ornithology (BTO), GOS, CCSC and NPTCBC. Records were requested in relation to the TLSB Project site and coastal areas within 2km of the TLSB Project. Data requested from the BTO included both Wetland Bird Survey (WeBS) core count data for the wider Swansea Bay and Low Tide Count data for those sectors of interest. Species action plans listed in the UK Biodiversity Action Plan (BAP) were also reviewed with regard to species potentially present in the TLSB Project area or in the surrounding study area. Relevant local plans within the Swansea BAP and Neath Port Talbot BAP were also consulted. In addition, coastal bird surveys were undertaken within a study area that extends from just east of the River Neath to Mumbles Head. Survey areas / sectors were selected to cover the whole of Blackpill SSSI and the intertidal area of Crymlyn Burrows to the west of the River Neath.
9.1.2 For full details on the data sources reviewed, surveys undertaken and the assessment see Chapter 11 of the TLSB ES (TLSB ES 2014).
9.2 Assessment of impacts
9.2.1 The only potential impact of the proposed electricity cable on coastal birds will occur during construction within the Crymlyn Burrows SSSI. The nearest high tide roost is Roost 3 and the construction activity will not interfere with that roost.
9.2.2 No significant residual adverse impact on Crymlyn Burrows SSSI is expected.
9.2.3 TLSB has produced a draft 275 kV CEMP to support this planning application. The 275 kV CEMP includes details of the measures that will be implemented to manage and where necessary mitigate any potential impacts on Crymlyn Burrows SSSI during the construction of the 275kV cable
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10 Terrestrial ecology
10.1 Introduction
10.1.1 An assessment of the likely significant effects of the TLSB Project on terrestrial ecology including terrestrial birds is presented Chapter 12 of the TLSB ES (TLSB ES 2014). The assessment methodology follows Ecological Impact Assessment (EcIA) guidance set out by the Institute of Ecology and Environmental Management (IEEM, 2006). The findings of specific field surveys supporting this Chapter are presented in the Terrestrial Ecology Technical Appendix (Volume 3) of the TLSB ES (TLSB ES 2014).
10.1.2 A formal data search for existing ecological information was commissioned from the South East Wales Biodiversity Records Centre (SEWBReC) in November 2012. A search area within 2.5km of the TLSB Project was requested for protected or otherwise notable species and a 5km search area for designated sites. Appendix 12.1, Volume 3 of the TLSB ES (TLSB ES 2014) identifies the search area (based on the DCO/redline project boundary) and presents the mapped results of the data search. The location of designated sites at greater distances was identified from Geographical Information System (GIS) resources available via the website of the Countryside Council for Wales (now Natural Resources Wales).
10.1.3 An extended phase 1 habitat survey of the terrestrial elements of the TLSB Project was begun during site visits between November 2012 and January 2013. The results of the initial survey were updated following repeated visits to the site through the spring and summer of 2013. JNCC 2010 habitat survey techniques were used, with habitats and other features of ecological interest being mapped and described using target notes. Particular note was taken of protected and/or notable species (as well as the potential for them to occur) during site visits following the Institute of Environmental Assessment Guidelines (IEA, 1995). The results of the survey are presented in Appendix 12.2, Volume 3 of the TLSB ES (TLSB ES 2014).
10.1.4 For full details on the data sources re, surveys undertaken and the assessment see Chapter 11 of the TLSB ES (TLSB ES 2014).
10.2 Assessment of impacts
10.2.1 The following sections look provide an overview of the assessment on Terrestrial Ecology that is presented within the TLSB ES (TLSB ES 2014). The following provides information that is relevant to the 275kV Project only.
10.3 Crymlyn Burrows SSSI
10.3.1 The underground electricity cable route runs from the western landfall then follows the port road to the southern edge of Fabian Way. The route will be located within a cycle way and highway verge on the southern sider of Fabian Way until reaching a point south-west of the ‘Amazon roundabout’ where it would follow the alignment of an existing track through the Crymlyn Burrows SSSI. The route will then cross the River Neath by constructing ducts via horizontal
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directional drilling. Directional drilling will require a single launch area and a single reception area located on either side of the River Neath. Existing tracks will be used to align the cable on a route passing from the River Neath to the western side of Baglan Bay substation. The proposed route maximizes usage of existing made ground and metalled surfaces.
10.3.2 The qualifying features of Crymlyn Burrows SSSI include: saltmarsh, sand dune; important invertebrate assemblages. For full details on the qualifying features of Crymlyn Burrows SSSI see Chapter 12 of the TLSB ES (TLSB ES 2014).
10.3.3 The installation and operation of the underground electricity cable is not expected to impact on saltmarsh and sand dune habitat as the cable route does not cross directly through either of these two habitats.
10.3.4 The habitat associated with Crymlyn Burrows is expected to remain unchanged by the TLSB Project and therefore, modification of the invertebrate assemblages would not be expected. The installation of the cable route alone would therefore have a lesser impact on the invertebrate assemblage than that for the TLSB Project as a whole and so no effect is predicted.
10.3.5 The installation of the cable will require a 10m wide easement over the approximately 1km SSSI cable run. Excluding the 3.5m wide track, temporary loss or disturbance of between 6500m2 and 11500m2 of existing fixed dune grassland habitat would result. The vegetation would be allowed to re-instate upon completion of the works or a ground reinstatement protocol will be adopted where required.
10.3.6 In addition, approximately a 15m by 15m compound will be required for the receptor area of the directional drill between the SSSI and the eastern banks of the River Neath. The receptor area will result in a further loss of 225m2 of fixed dune grassland and gorse-dominated scrub.
10.3.7 In the short-term, the above construction methodology of the 275kV cable would lead to localised temporary loss of fixed dune grassland habitat along the width of the cable trench and directional drill receptor pit, in addition to temporary covering of habitat by ground protection measures. In the medium to longer term, this creation of bare ground and reinstatement of dune grassland (associated with the DCO for the wider TLSB Project) would result in some positive impacts. Overall, it is envisaged that the significance of construction activities associated with the cable route options would be Minor Adverse in the short-term with the implementation of the mitigation measures identified above, and No impact in the longer term on this receptor of National value.
10.4 Bare ground, ephemeral and short perennial vegetation
10.4.1 Construction of the cable route also has potential to impact habitat on the eastern banks of the River Neath. Basil Thyme was found in bare ground near the pipe- bridge and Yellow Bartsia in grassland habitat. Habitat associated with the eastern banks of the Neath is considered of District value. Given the temporary nature of the impact and association of species present with disturbed habitats, even in the
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absence of mitigation, the magnitude of the impact is considered to be Minor Negative equating to Insignificant construction impact.
10.5 Fabian Way Conservation Verge
10.5.1 Cable installation involving open cut trenching along the verge of Fabian Way will disturb existing grassland habitat. Grassland recovery would be expected in the medium term resulting in No impact. Top soils and sub soil will be stored and reused to reinstate on a like for like basis.
10.6 Reptiles
Environmental Management Requirements
10.6.1 Four native species of reptile: grass snake (Natrix natrix), adder (Vipera berus), common lizard (Zootoca vivipara) and slow worm (Anguis fragilis) have been recorded within 2.5km of the site (TLSB Environmental Statement Chapter 12, 2013). These four species are offered legal protection under Schedule 5 of the Wildlife and Countryside Act 1981 (as amended). However, protection is not extended to their habitat under this legislation. A Reptile Strategy has been developed to ensure that all reasonable measures are undertaken to avoid the incidental mortality and injury of reptiles during construction works of the 275 kV cable route Project and to ensure compliance with the Wildlife and Countryside Act 1981 (as amended). It also aims to ensure that there is no net loss of reptile habitat as a result of the works and to increase the area of habitat suitable for reptiles in the long term.
10.6.2 All of these species are also listed under Section 7 of the Environment (Wales) Act 2016 as species of ‘principle importance for the purposes of conserving biodiversity’. Under this Act, all local and public authorities in England and Wales have a duty to promote and enhance biodiversity in all of their functions. Delivery Strategy
10.6.3 Installation of the 275 kV cable will result in temporary construction impacts to reptile habitat through Crymlyn Burrows SSSI. Habitat suitable for reptiles will be affected along a 1000 m long, up tp 10 m wide easement in addition to a 900 m2 horizontal directional drill reception pit on the western side of the River Neath. This equates to 1.09 ha of the SSSI temporarily affected by the works, which is approximately 0.8% of the suitable reptile habitat within the SSSI.
10.6.4 Construction through the SSSI will be using either a trench methodology or the plough method and will take approximately 7 weeks. Both methodologies are described in more detail in the 275 kV Cable Installation Construction Method Statement provided as part of this application (TLSB, November 2016).
10.6.5 The cable will be installed under the existing tarmac track (already subject to disturbance by walkers), in order to avoid higher value reptile habitat such as south- facing fronts of dune ridges.
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Crymlyn Burrows SSSI 275 kV cable route: Habitat manipulation
10.6.6 Existing disturbance on both sides of the access track means that habitat suitable to support large populations of reptiles is limited. Habitat manipulation without exclusion fencing would therefore be used along the cable route in order to encourage reptiles not to enter the impact area (up to 10 m working width including an existing track).
10.6.7 Grassland and scrub within the working width will be cut or strimmed by hand to a height of 10 cm and arisings removed from site under supervision of a suitably experienced ecologist. This will be carried out over winter (when reptiles are still in hibernation and prior to the bird nesting season) prior to commencement of the 275 kV cable installation. Areas already supporting short-turf will also be maintained as short as possible. These measures will discourage reptiles from entering the working width.
10.6.8 Installation of the cable route through the SSSI will take place in line with the 275 kV Cable Installation Construction Method Statement (TLSB, November 2016) which includes provisions for grassland restoration.
10.6.9 A different approach will be taken at the River Neath 275 kV cable crossing HDD reception pit as outline below. Crymlyn Burrows SSSI 275 kV cable HDD reception pit: Habitat manipulation
10.6.10 Grassland and scrub at the site of the River Neath underground 275 kV cable crossing HDD reception pit; including an additional 2 m buffer zone; will be cut or strimmed to a height of 10 cm. The arisings will be removed from site during late winter, prior to relocation. Areas supporting short-turf will be maintained as short as possible. These measures will encourage reptiles to move away from/not enter the construction zones into more suitable adjacent habitat. Crymlyn Burrows SSSI 275 kV cable HDD reception pit: Reptile survey, exclusion, capture and translocation
10.6.11 The 15 m x 15 m compound for the River Neath underground 275 kV cable crossing HDD reception pit will then be demarcated and fenced using a one-way barrier. The barrier will consist of polythene sheeting or alternatively sections of 450 mm twin- wall drainage pipe cut longitudinally and half buried into the ground. Heras fencing will also be used to demarcate the compound following the buffer zone to discourage public access. The area will then be subject to a programme of capture and relocation during the spring and summer prior to installation of the 275 kV cable.
10.6.12 Artificial refugia (tins) consisting of 0.5 m2 squares of bitumastic roof felt will be deployed at a density of at least 100-200 tins per hectare within the area to be disturbed. Tins will be allowed to bed in for ten days before daily checks for reptiles by a suitably experienced ecologist begin. Checks will be scheduled to begin once the exclusion fencing is installed in the spring and continue through the summer months under suitable conditions.
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10.6.13 Removal of reptiles will continue for a minimum of 30 days of checks during suitable weather conditions. Removals will cease after this period and when a successive period of 5 days are reported where no reptiles are found during this 5 day period. All reptiles captured during this programme would be released outside the cable reception site at suitable locations within the SSSI, with no more than five individuals of any one species being released at any release site. Each release site will be at least 100 m from the next. Release sites will be south-facing and away from actively-used footpaths. Artificial refugia will also be deployed at each release site. The purpose of this approach is to limit any significant reduction in site carrying capacity as reptiles are already known to be present.
10.6.14 The 275 kV cable HDD reception pit represents 0.07% of suitable habitat for reptiles within the SSSI. It would therefore be expected that the number of reptiles to be found during the survey would be low.
10.6.15 Prior to commencement of construction of the 275 kV cable and depending on the numbers of reptiles relocated, consideration will also be given to undertaking a destructive search of the cable HDD reception pit area. The destructive search would consist of the supervised slow and methodical removal of soil and vegetation by the toothed-bucket of an excavator, prior to cable installation. Any decision to undertake a destructive search would need to take into account the short term impacts on the vegetation of the SSSI and would be taken in consultation with NRW and the local planning authority.
10.6.16 Once the cable duct has been received and installed in the HDD reception pit, the reptile exclusion fence will be removed and the vegetation will be allowed to regenerate naturally or in line with the ground reinstatement protocol (if required) outlined in the Construction Method Statement (TLSB, November 2016) provided with this application. Swansea Docks 275 kV cable route
10.6.17 Presence of a relatively small population of common lizard was confirmed from an approximately 40m strip of the 600 m length of suitable habitat within Swansea Docks during surveys undertaken to inform the Environmental Statement (TLSB Environmental Statement Chapter 12, 2013). Common lizards were discovered in low numbers on eight of the eleven survey visits. On each of these occasions one to two individuals were recorded with the exception of a visit in late May 2013 when six individuals were recorded (four adults / two juveniles).
10.6.18 The area identified as supporting reptiles within Swansea Docks will be subject to disturbance over several stages of construction. Given the length of the construction period and the increased risk of inadvertent damage due to construction activities, it is therefore considered to be appropriate to remove reptiles from the construction zone. This is a suitable long term response which prevents any future risk of injury or mortality to the reptile population.
10.6.19 Construction of the wider TLSB Project (such as internal haul roads and 11kV power supply) will impact upon this same reptile population and habitat within the Swansea Docks well in advance of installation of the 275kV cable. By the time of
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construction of the 275 kV cable route through Swansea Docks, the presence of reptiles will not be a constraint to the construction of the 275 kV cable route. The method of relocation of the reptile population within the Swansea Docks is set out in the Reptile Strategy as set out in DCO Requirement 5 for the wider TLSB Project.
10.7 Terrestrial Invasive Non Native Species (INNS)
10.7.1 Japanese knotweed (Fallopia japonica), Japanese rose (Rosa rugosa), Montbretia (Crocosmia crocomiiflora), Sea buckthorn (Hippophae rhamnoides) and Early goldenrod (Solidago gigantean) have been identified in surveys undertaken for the TLSB Environmental Statement between November 2012 and June 2013 in the vicinity of the cable route within the SSSI.
10.7.2 Japanese knotweed, Japanese rose and Montbretia are all listed under Schedule 9 of the Wildlife and Countryside Act 1981 (as amended), making it illegal to plant or otherwise cause to grow in the wild.
10.7.3 Japanese knotweed plant material and soil containing plant material and/or rhizomes can also be classified as “controlled waste” or, if treated with herbicide, “hazardous waste” and so is subject to measures outlined in the 275kV CEMP.
10.7.4 Currently control of Sea buckthorn and Early goldenrod is not stipulated under legislation.
10.7.5 An updated pre-construction survey will be undertaken prior to installation of the 275kV cable. Any further INNS found at this stage will be addressed through the 275kV CEMP in consultation with the relevant planning authorities.
10.8 275 kV CEMP
10.8.1 TLSB has produced a draft 275 kV CEMP to support this planning application. The 275 kV CEMP includes details of the measures that will be implemented to manage and where necessary mitigate any potential impacts during the construction of the 275kV cable. The 275 kV CEMP provides details relevant to terrestrial ecology including but not limited to; reptiles, terrestrial INNS and construction lighting.
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11 Seascape and landscape visual impact assessment
11.1 Introduction
11.1.1 An assessment of the likely significant effects of the TLSB Project on seascape and landscape visual impacts is presented Chapter 13 of the TLSB ES (TLSB ES 2014).
11.1.2 For the purposes of the assessment ‘seascape’ is defined as “landscapes with views of the coast or seas, and coasts and the adjacent marine environment” (The Landscape Institute & Institute of Environmental Management and Assessment (IEMA), 2013).
11.1.3 For the purposes of the assessment ‘landscape’ is defined as “an area, perceived by people, whose character is the result of the interaction of natural and/or human factors” (Natural England, 2012).
11.1.4 For full details on the seascape and landscape visual impact assessment see Chapter 13 of the TLSB ES (TLSB ES 2014).
11.2 Assessment of impacts
11.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. The entire length of the cable will be buried below ground. Any visual effects are therefore restricted to the construction period and will be temporary in nature. The proposed 275kV cable route will therefore not have any effects upon seascape or landscape.
11.2.2 The draft 275 kV CEMP provided as part of this TCPA application outlines measures for fencing during the construction phase of the 275kV Project. These measures will ensure any visual impact during construction is minimised.
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12 Navigation marine transport assessment
12.1 Introduction
12.1.1 An assessment of the likely significant effects of the TLSB Project on shipping and navigation is presented Chapter 14 of the TLSB ES (TLSB ES 2014). For full details on baseline conditions, assessment methodology and associated impacts see Chapter 14 of the TLSB ES (TLSB ES 2014).
12.2 Assessment of impacts
12.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. The only relevant section of the cable route to marine navigation is that where it crosses the River Neath. The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation. There are therefore no effects anticipated on marine transport due to the 275kV Project.
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13 Onshore transport assessment
13.1 Introduction
13.1.1 An assessment of the likely significant effects of the TLSB Project on onshore traffic and transport is presented in Chapter 15 of the TLSB ES (TLSB ES 2014). This chapter describes the assessment of the impact of the TLSB Project on the surrounding highway network, public transport, cycling and pedestrian amenities. It is based on an assessment of the interaction between future development- related movements and existing patterns of vehicular, pedestrian and cycle movements. The scale and extent of the assessment has been defined in accordance with the 1994 Institute of Environmental Management and Assessment (IEMA) guidelines.
13.1.2 For full details on the baseline conditions, study area, assessment methodology and associated impacts on traffic and transport see Chapter 21 of the TLSB ES (TLSB ES 2014).
13.2 Assessment of impacts
13.2.1 The proposed route of the 275kV cable coridoor of the electricity cable runs, as it leaves the Port of Swansea, along Fabian Way. Fabian Way is an arterial road which forms part of the A483, connecting Swansea city centre with the M4 motorway at Junction 42. It is the main route into Swansea from the surrounding area and for traffic from further afield and runs adjacent to the Port. There are two junctions off Fabian Way providing access to the Port (the old Port access opposite the Park & Ride, and Baldwin’s Crescent). There is no public access to the Port of Swansea at present. Bus services operate along Fabian Way and the TLSB Project can be accessed from bus stops at two locations. There is a cycle path running along the length of Fabian Way that forms a section of both National Cycle Network route 4 (NCN 4) and the Swansea to Glyncorrwg Loop. There is a Park & Ride facility located to the north of Fabian Way at the Langdon Road junction.
13.2.2 The potential impact of the installation of the 275kV cable in terms of construction traffic is not significant. The impact on public transport during the construction phase is expected to be negligible. Impacts on pedestrian and cyclist amenity are also expected to be negligible.
13.2.3 In order to ensure impacts are minimised as far as possible the following measures will be implemented:
• No access to the site will be made via junctions A9 or A10;
• A Travel Plan Coordinator / Logistics Coordinator will be appointed;
• HGV movements along Fabian Way will be managed to ensure that deliveries are timed to avoid the commuter peak periods as far as possible; and
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• A Construction Phase Traffic and Travel Management Plan will be developed.
13.2.4 TLSB has produced a draft 275 kV CEMP to support this planning application. The 275 kV CEMP includes details of the measures (including those identified above) that will be implemented to manage and where necessary mitigate any potential impacts during the construction of the 275kV cable. This includes the implementation of a Construction Phase Traffic and Travel Management Plan which will help to minimise the impact of construction of the 275kV cable route on all modes of transport.
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14 Air Quality
14.1 Introduction
14.1.1 An assessment of the likely significant effects of the TLSB Project on air quality is presented in Chapter 16 of the TLSB ES (TLSB ES 2014). In order to quantify the baseline air pollutant concentration for the TLSB Project, and inform the assessment of likely significant effects, an air quality study was undertaken using the 2013 version of the Atmospheric Dispersion Modelling System for road modelling (ADMS-Roads). For full details on the assessment methodology and impacts on air quality see Chapter 16 of the TLSB ES (TLSB ES 2014).
14.2 Assessment of impacts
14.2.1 Construction activities associated with the 275kV cable route have the potential to generate fugitive dust emissions as a result of construction, earth works or track- out material. Chapter 16 of the TLSB ES (TLSB ES 2014) considers impacts on air quality for the wider TLSB Project including the grid connection works. The assessment concluded that the overall effect of the 275kV Project will have a negligible effect and as such is considered to be not significant with regards to local air quality. The impact of the works associated with the 275kV Project are therefore likely to be significantly less and therefore negligible.
14.2.2 The City and County of Swansea Council (CCSC) has agreed to carry out a dust monitoring survey for the TLSB Project which will be used as a baseline to inform the installation of the 275kV cable. Details of the monitoring survey will be agreed with CCSC and Neath Port Talbot County Borough Council (NPTCBC) prior to construction.
14.2.3 In addition, the draft 275 kV CEMP provided as part of this TCPA application outlines management measures for dust during the construction phase of the 275kV Project. These measures will ensure any impact on air quality during construction is minimised.
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15 Hydrology and flood risk
15.1 Introduction
15.1.1 An assessment of the potential hydrological and flood risk impacts of the TLSB Project is presented in Chapter 17 of the TLSB ES (TLSB ES 2014). The study area for the assessment included the onshore area of the TLSB Project and a corridor 100m either side of the 275kV cable route running from the western landfall to the National Grid substation at Baglan. A desk top study was undertaken in 2013 comprising a desk-based review of the TLSB Project, which included the collation of information from Ordnance Survey, the Environment Agency, Welsh Governments Advice Maps and a Landmark Envirocheck report. A site visit was undertaken in December 2012 to identify water features, flood defenses, on-site surface water management measures and record any other potentially relevant and readily identifiable features of hydrological interest.
15.1.2 For full details on the assessment methodology and associated impacts on hydrology and flood risk see Chapter 17 of the TLSB ES (TLSB ES 2014).
15.2 Assessment of impacts
15.2.1 The proposed cable route corridor crosses the River Neath estuary (see Appendix A). The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation.
15.2.2 During the construction phase of the proposed electricity cable, standard good practice construction practices will be used to control and minimise the effect on surface waters. This would include reducing potential contamination caused by the construction process, such as release of sediments into the sewers, spillage and leakage of oils and fuels, leakage of wet cement and concrete, and the disturbance of existing contamination and drainage. The overall likely impact of the 275kV Project during construction would be minor and temporary in nature with the implementation of the mitigation measures.
15.2.3 The proposed electricity cable will not give rise to any significant impacts upon flooding or flood risk.
15.2.4 TLSB has produced a draft 275 kV CEMP to support this planning application. The 275 kV CEMP includes details of the measures that will be implemented to manage and where necessary mitigate any potential impacts during the construction of the 275kV cable. The 275 kV CEMP includes measures specific to pollution prevention and spill response.
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16 Land quality and hydrogeology
16.1 Introduction
16.1.1 An assessment of the potential land quality and hydrogeological impacts of the TLSB Project is presented in Chapter 18 of the TLSB ES (TLSB ES 2014). The chapter identifies key land contamination receptors and their sensitivities, including the principal water resources. The assessment involved the review and collation of available information pertaining to the condition of soils and groundwater within the wider TLSB Project site. This included a desk top review of a range of data sources and the completion of a walkover survey which was undertaken in 2013. For full details on the assessment methodology and associated impacts on hydrology and flood risk see Chapter 18 of the TLSB ES (TLSB ES 2014).
16.1.2 Since the production of the TLSB ES (TLSB ES 2014), TLSB has commissioned WYG Environment Planning Transport Ltd (WYG) to undertake a further ground conditions desk study. The desk top study covers a number elements which include; the 275kV cable route from the western landfall to Baglan Bay National Grid substation, and the cable crossing beneath the River Neath to be achieved by means of horizontal directional drilling. It is these elements of the report which are relevant to this TCPA application. The WYG Ground Conditions Desk Study (2016) is provided as part of this TCPA application at 275kV Cable Route Ground Contamination Report Appendix B and 275kV Cable Route Ground Contamination Report Appendix C.
16.2 Assessment of impacts
16.2.1 The location of the 275kV cable route corridor is shown in Appendix A of this Addendum. Most of the land along the foreshore of the Port of Swansea was reclaimed, many years ago, from the intertidal area to form the dock enclosure and is therefore comprised of ‘made ground’. Queen’s Dock was formerly an oil terminal with pipelines that ran to the Llandarcy Refinery and Baglan Bay chemical works. Pipelines are thought to remain in the ground from the Port boundary to the River Neath / Baglan Bay on approximately the same route to that proposed for the 275kV Project's grid connection to the NETS.
16.2.2 Parts of the onshore area have been subject to industrial use, in conjunction with the Port operations and associated industrial activities, for many years. Some areas with previously-identified land contamination have already been remediated by the landowners.
16.2.3 TLSB recognise that land contamination impact on the proposed works needs to have been fully considered and as such has developed a Ground Contamination Report which is provided as part of this TCPA application. The Report makes reference reference to the advice as set out in the following documents:
• Development of Land Affected by Contamination: A Guide for Developers,
16.2.4 This document also aligns with and makes reference to the following:
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• Model Procedures for the Management of Land Contamination – Contaminated land Report 11. • CL:AIRE: The Definition of Waste - Development Industry Code of Practice 16.2.5 This report outlines a Ground Contamination Delivery Strategy which details how TLSB propose to deal with ground contamination matters for the 275kV cable route. For full details on this strategy refer the Ground Contamination Report provided as part of this application. The Ground Contamination Report also includes the following appendices which should be referred to:
• Appendix A: TLSB – Ground Contamination Delivery Strategy – Cable Route
• Appendix B: WYG Phase I Preliminary Risk Assessment.
• Appendix C: WYG Phase II Designed Specification and BoQ
• Appendix D: Drawing ‘Ground Contamination -SI Phase 2 Locations and Scope’
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17 Noise and vibration
17.1 Introduction
17.1.1 An assessment of the likely significant effects on noise and vibration associated with the TLSB Project is presented in Chapter 19 of the TLSB ES (TLSB ES 2014). The geographic extent of the study area for airborne noise and vibration impacts is limited to sensitive receptor locations in the cola vicinity of the TLSB Project (see Section 19.3.2 of Chapter 19 TLSB ES 2014). In order to determine baseline noise data, background noise data were reviewed including data from previous noise surveys undertaken in the area. In addition, onshore baseline onshore noise surveys were undertaken in 2013 at sites along Swansea seafront past the Swansea University Bay Campus (SUBC) and the adjacent Crymlyn Burrows SSSI along to the southern end of Aberafan seafront (see Table 19.1 and Figure 19.2 of Chapter 19 TLSB ES 2014).
17.1.2 For full details on the assessment methodology and associated impacts on noise and vibration see Chapter 19 of the TLSB ES (TLSB ES 2014).
17.2 Assessment of impacts
17.2.1 The construction of the 275kV cable includes routes alongside roads and pavements. Noise from this activity would be transient as the works progress along the rout of the cable. However, it is anticipated that noise levels from this activity would be no louder than typical roadwork activities and will only be undertaken during the daytime. There is therefore not predicted to be any likely significant effect on onshore receptors.
17.2.2 The proposed cable route corridor crosses the River Neath estuary (see Appendix A). The proposed method of crossing the River Neath is through ducts formed by directional drilling. Underwater noise measurements maximum) of directional drilling will result in very low levels of noise at the river bed of less than 130dB re. 1μPa (Nedwell et. al., 2012) whilst directly above the noise source. These levels are only slightly higher than background noise levels, and are considered to be at a low enough level that there will be no likely significant effect on underwater receivers.
17.2.3 Construction activities associated with the 275kV cable route have the potential to generate fugitive dust emissions as a result of construction, earth works or track- out material. Chapter 16 of the TLSB ES (TLSB ES 2014) considers impacts on air quality for the wider TLSB Project including the grid connection works. The assessment concluded that the overall effect of the 275kV Project will have a negligible effect and as such is considered to be not significant with regards to local air quality. The impact of the works associated with the 275kV Project are therefore likely to be significantly less and therefore negligible.
17.2.4 The CCSC has agreed to carry out the noise monitoring for the TLSB Project and associated construction activities, including the 275 kV cable route Project. This will be carried out using a B&K 2250 noise monitor. This monitor is for general use class
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1 sound measurements in accordance with BS 5228 and can be used for occupational and environmental assessments as well as logging information.
17.2.5 Further to consultation with the Environmental Department of CCSC, it has been formally agreed that a one week baseline noise survey will be carried out prior to commencement of the construction of the wider TLSB Project. Once this information has been gathered, CCSC intends to have a flexible and reactive approach and will conduct noise monitoring surveys as required during the construction phase. As such the frequency of noise measurements and the noise data submissions will be determined in an adaptive approach.
17.2.6 It is not intended to use noise trigger levels on the 275 kV cable route Project. CCSC would rather deal with any potential complaint on its merit, taking into account the baseline measurements.
17.2.7 The draft 275 kV CEMP provided as part of this TCPA application outlines the draft noise monitoring proposals for the construction of the 275kV cable route and should be referred to for full details.
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18 Cultural heritage marine archaeology
18.1 Introduction
18.1.1 An assessment of the likely significant effects of the TLSB Project on the maritime cultural heritage resource is presented in Chapter 20 of the TLSB ES (TLSB ES 2014). TLSB ES 2014). The assessment present has been guided by the Standard and Guidance for Historic Environment Desk-Based Assessment issued by the Institute for Archaeologists (IfA 2011); NPPF (CLG 2012); Appendix 10 of the Good Practice Guide for the Preparation of Environmental Statements issued by the former Department of the Environment (DoE 1995); and Environmental Impact Assessment: a Guide to Procedures issued by the former DETR and the National Assembly for Wales (2000). A desk-based assessment is presented which examines the maritime archaeological resource through the collation of existing written, cartographic, photographic and electronic evidence. The study area was established for a broad data collection area that extends across the whole of Swansea Bay. In addition, two intertidal walkover surveys were undertaken in the site study area in 2013. For full details on the assessment methodology and associated impacts on marine archaeology see Chapter 20 of the TLSB ES (TLSB ES 2014).
18.2 Assessment of impacts
18.2.1 The proposed cable route corridor crosses the River Neath estuary (see Appendix A). The proposed method of crossing the River Neath is through ducts formed by directional drilling. The ducts will aim to be installed with approximately 10m clearance where possible from the top of the duct to the river bed above. Final duct depth will be determined following the undertaking of detailed getotechnical surveys prior to installation. It is therefore anticipated that there will be no effect on marine archaeology as a result of the 275kV Project.
35 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 Tidal Lagoon Swansea Bay Plc
19 Cultural heritage terrestrial archaeology and historic landscape
19.1 Introduction
19.1.1 An assessment of the likely significant effects of the TLSB Project on cultural heritage: terrestrial archaeology and historic landscape resource is presented in Chapter 21 of the TLSB ES (TLSB ES 2014). To inform the assessment an archaeological desk-based assessment, supported by a site walkover assessment, was undertaken in January 2013.
19.1.2 A 1km radius around the site boundary including the cable route, known as the Inner Study Area, was used to determine the archaeological and historical baseline. A wider study area of 5km extending from the boundaries of the TLSB Project at the western end (Queens Dock) and on the landward side of the route of the cable trench to the east, was also developed to assess all statutorily protected historical structures.
19.1.3 The desk-based assessment also included an assessment of archaeological investigations undertaken within 1km of the TLSB Project boundaries (the Inner Study Area). The desk-based report (presented in Appendix 21.1, Volume 3 of Chapter 21 of the TLSB ES 2014) was prepared in line with the Institute for Archaeologists Standard and Guidance for archaeological desk-based assessment (IFA 1994, Revised September 2001, October 2008 and November 2012) (IFA, 2012).
19.1.4 For full details on the assessment methodology and associated impacts on terrestrial archaeology and cultural heritage see Chapter 21 of the TLSB ES (TLSB ES 2014).
19.2 Assessment of impacts
19.2.1 The cable connection route passes through an area of sandy foreshore deposits, some of which appear to have formed in the very recent past through sedimentation, probably due to the construction of the dock piers in the 19th and 20th centuries. From the landfall of the cable at the high water mark to where it either joins Fabian Way, there has been much 20th century development and any archaeological remains of significance in this location are unlikely to survive due to modern disturbance. As the cable trench is not expected to be very deep the potential to impact archaeological remains along this section is low
19.2.2 The cable route lies within the southern verge of Fabian Way. The road, which was constructed in the 1940s, was almost certainly elevated by one to two metres throughout the extent of the cable run and the archaeological potential of this central section of the proposed cable route option is low.
19.2.3 Where the cable route runs through Crymlyn Burrows SSSI there may be potential for the area to contain archaeological remains at a depth relating to former
36 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 Tidal Lagoon Swansea Bay Plc
marine environments. This Will be minimised as the cable will be installed beneath the existing tarmac track. However, a worst case scenario has been adopted in the TLSB ES which is considered in greater detail in Chapter 20: Cultural Heritage: Marine Archaeology. Relevant to the cable route, Chapter 20 identifies that there appears to be some potential for maritime remains, comprising ships or boats dating to the medieval period to be present, due to the foundation of a settlement of Swansea, and contemporary examples of shipping along the south Wales coast. However, due to the location of the coastline this potential may be somewhat limited to wreck sites, with any extant deliberately beached boats likely to be in the Crymlyn Burrows area, and thus beyond the TLSB Project site.
19.2.4 Consequently, it is very likely that any remains associated with former marine environments will be located at sufficient depth for the cable trench not to cause any impact. The potential for archaeological remains in the Crymlyn Burrows area of the proposed cable route option is considered to be low.
19.2.5 Where the cable route diverges in a south easterly direction across Crymlyn Burrows, the assessment records evidence for a Jersey Marine airfield in the 1930s and WWII military installations during the 1940s further to the north. However, aerial photographic evidence suggests that the extent of the WWII remains were limited to an area sufficiently distant from the 275kV Project for there not to be an impact. However, it is possible that further WWII military activity took place in the location of the proposed cable corridor and the potential for archaeological remains pertaining to this are low to medium. The 1920s-1930s airfield was located on Crymlyn Burrows to the north of the 275kV Project, but it is exact location is not currently known. The airfield is not thought to have been a surfaced runway, and a linear feature shown on the 1937-1947 OS maps possibly represents this feature. The potential for remains relating to the former airfield is low.
19.2.6 As the cable route options approach the River Neath, on both the western and eastern sides there is little archaeological evidence, presumably due to the dangers associated with the river at this point. Even as early as the Norman period, the crossing at Briton Ferry was known to be treacherous due to sandbanks and strong currents (Morgan 1977). Limited and small scale industrial activity has taken place further away from the river and on the western side, a coal drift to the north of the route options and abandoned tunnel workings of 19th century date to the south were once present. Further tunnel workings were also present on the eastern side of the river, and additional upstream major industrial activity took place with iron and copper works. The potential for archaeological remains in this area is low.
19.2.7 Having crossed the River Neath via horizontal direction drilling the final section of the route crosses Baglan Bay to link to a substation at the site of Baglan Bay Power Station, an area not previously developed until the mid- to late 20th century. The sandy deposits and the topographically isolated location suggests that the area was little used in the past and any archaeological remains would
37 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 Tidal Lagoon Swansea Bay Plc
have been restricted to temporary activities that would have probably left few traces. It is likely that extensive development during the later 20th century will have removed any potential remains that may have existed. This is apparent on an aerial photograph from 1970 (Plate 18, Appendix 21, Volume 3). The HER records the existence of an early 20th century rifle practice range in this approximate location, but it is unlikely that any remains of this exist. Research has shown that peat deposits may be present at depth in this area, but the cable trench is not expected to be deep enough to disturb any potential palaeoenvironmental remains of significance. The potential for archaeological remains to be present in the Baglan Bay section is low.
19.2.8 In conclusion, ground works for the construction of the cable trench connection between Baglan Bay and Queens Dock may traverse areas of previously undisturbed ground, however this risk has been minismised by installation of the cable beneath the existing tarmac track, please see the application drawings for more information. These areas have been assessed using a worst case scenario as having as having a low level of archaeological importance, with the magnitude of impact considered to be low. Therefore, the impact on the Historical resource is negligible.
19.2.9 With the proposed mitigation, the electricity cable is judged to have a negligible impact on the terrestrial cultural heritage resource.
19.2.10 TLSB has produced a draft 275 kV CEMP to support this planning application. The 275 kV CEMP includes details of the measures that will be implemented to manage and where necessary mitigate any potential impacts terrestrial archaeology and historic assets during the construction of the 275kV cable. This includes the implementation of a watching brief during construction.
38 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 Tidal Lagoon Swansea Bay Plc
20 Economy, tourism and recreation
20.1 Introduction
20.1.1 An assessment of the potential socio-economic impacts at local and regional levels of the TLSB Project in terms of the economy, tourism and recreation is presented in Chapter 22 of the TLSB ES (TLSB ES 2014). TLSB ES 2014). For full details on the assessment and associated impacts on economy, tourism and recreation, see Chapter 22 of the TLSB ES (TLSB ES 2014).
20.2 Assessment of impacts
20.2.1 The 275kV Project will not have any effect on the economy, tourism or recreation.
39 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 Tidal Lagoon Swansea Bay Plc
21 Appendix A – 275kV Cable Route Corridor
40 Tidal Lagoon Swansea Bay Plc – TLSB ES Addendum: 275kV Cable Route TLSB-TCPA-275 Cable Route-ES Addendum-Nov 16-1.0 N
NE NW
W E
SW SE
S
275kV CABLE ROUTE
Rev. Date Description By Chk'd App'd
Drawing Status Suitability
Location SWANSEA BAY SWANSEA WALES
Client TIDAL LAGOON (SWANSEA BAY) PLC
Project Title 275kV CONNECTION CABLING ROUTE
Drawing Title
LOCATION PLAN
Scale Designed Drawn Checked Authorised
Original Size Date Date Date Date 0 1000M 2000M A3 Drawing Number Revision Stage BollarHS-D Works FS N BollarHS-D BollarHS-D Cn
Jetty BollarHS-D Check Prince of Wales Dry Dock No 2 Point BollarHS-D NE MLW Prince of Wales Dry Dock No 1 Lock NW Custom House L Twr BollarHS-D
BollarHS-D L Twr W E L Twrs
Bollard SW BollarHS-D SE BollarHS-D Bol Cn Bollard
BollarHS-D Bollard Mean High Water Signal S Tower Cn BollarHS-D Pumping Station
Jetty BollarHS-D BollarHS-D 275kV CABLE ROUTE MLW Works BollarHS-D
Tank Bollard 6.1m Mean High Water
BollarHS-D
Tide Gauge Mud
BollarHS-D
BollarHS-D
BollarHS-D
Jetty
Crane
Jetty
Bollard
Slipway
SM
Jetty Mud SM SM
BollarHS-D
6.4m
Works Posts
SlopingPosts masonry 7.0m 6.4m DW DW Sloping masonry Sloping masonry 6.4m CCLW Wind Turbine Mean High Water
6.4m
(Afon Tawe)
Boro Const, Asly Const & ED Bdy
River Tawe
Navigation Light
Mean High Water
Mean High Water
Mud and Shingle DW
MLW Eastern Breakwater
Mud and Shingle
Rev. Date Description By Chk'd App'd
Drawing Status Suitability
7.3m Location Boro Const, Asly Const, UA, C & ED Bdy Und SWANSEA BAY Mean Low Water SWANSEA WALES
Client TIDAL LAGOON (SWANSEA BAY) PLC
Mean Low Water
Project Title 275kV CONNECTION 7.0m CABLING ROUTE
Drawing Title
PLAN
Mud Scale Designed Drawn Checked Authorised
MHW MLW and Shingle MLW
Navigation Light (Fixed Green) Original Size Date Date Date Date DW 0 100M 200M A3 Drawing Number Revision Berthing Light Dolphins
BollarHS-D Bollard N
BollarHS-D NE NW
BollarHS-D W E
Berthing Light SW SE Bollard Berthing Light Dolphins
BollarHS-D Bollard S
BollarHS-D 275kV CABLE ROUTE
BollarHS-D Queen's Dock
FS
Jetty
BollarHS-D
6.1m BollarHS-D BollarHS-D DW Sloping masonry
Mean High Water
BollarHS-D 6.4m
Jetty
BollarHS-D
BollarHS-D
BollarHS-D Sand and Shingle BollarHS-D BollarHS-D
6.4m
BollarHS-D Jetty
BollarHS-D
DW
Sloping masonry
BollarHS-D BollarHS-D Mean High Water
Sand
6.1m
Sand &
BollarHS-D Shingle
Jetty Crane 6.4m DW
Jetty Sloping masonry Mean Low Water
Mean High Water Store
Sand Bollard
6.4m
Mud Rev. Date Description By Chk'd App'd and Shingle Drawing Status Suitability
Mud and Shingle Location SWANSEA BAY SWANSEA WALES
Client TIDAL LAGOON (SWANSEA BAY) PLC
Project Title
Mud and Shingle 275kV CONNECTION CABLING ROUTE
Drawing Title
PLAN
Mean Low Water
Scale Designed Drawn Checked Authorised
Original Size Date Date Date Date 0 100M 200M A3 Drawing Number Revision Trinity House Depot 0 FS 6.4m L Twr BollarHS-D FS
DW 6.1m 6.4m
Mean High Water BollarHS-D Sloping masonry
SM Jetty
SM BollarHS-D Dolphin 100M BollarHS-D Berthing Light Dolphin BollarHS-D
Track BollarHS-D BollarHS-D 200M
BollarHS-D
Landing Stage
BollarHS-D BollarHS-D Jetty SM
Shingle Track Jetty BollarHS-D Stage Landing Bollard Shingle Bollard
Shingle
DW Sloping masonry
Mean High Water Sloping masonry Sloping
Shingle BollarHS-D 6.7m DW Sand Conduit 6.7m
DW
DW
Sloping masonry
Mean High Water Sand
DW 6.7m
DW Drawing Number Original Size Scale Drawing Title Project Title Client Location Drawing Status Rev. A3 Date TIDAL LAGOON (SWANSEA BAY) PLC 275kV CONNECTION Date Designed CABLING ROUTE W SWANSEA BAY 275kV CABLE ROUTE SWANSEA
SW NW WALES Description PLAN Date Drawn
N S NE SE Date Checked E By Date Authorised Revision Suitability Chk'd App'd 7.3m N
L Twr
FW Tank
7.3m NE NW
Tank Lighting Tower W E El Sub Sta
Warehouse SW Und SE
Tank Depot
FF Tk
FW FF S
S Path BP El Sub Sta
Und 275kV CABLE ROUTE Lighting FABIAN WAY Tower
8.5m Works
Tanks Works Depot
FF Ppg Sta Compass House
Tank
Shelter 1
Tank
4
30 Boro Const, UA, C and ED Bdy 7 25
20
13 FW Chimney
BALDWIN'S Tank 7 CRESCENT Playground Pond Co Const Bdy
FABIAN WAY 1 LB El 7.6m Sub Sta Car Park FF
Community Centre GG Cycle CRYMLYN BURROWS PARK Track Sloping masonry Playground
Sloping masonry
FABIAN WAY Sloping masonry Cycle Path
Sloping masonry
Track
DW
Track
DW
Sloping masonry
DW
Und
Co Const Bdy Boro Const, UA, C and ED Bdy ED and C UA, Const, Boro Mean High Water Rev. Date Description By Chk'd App'd
Drawing Status Suitability
Location SWANSEA BAY SWANSEA WALES
Dunes Client
Sand
Sand TIDAL LAGOON (SWANSEA BAY) PLC
Conduit
Sand Project Title 275kV CONNECTION Mean High Water
Conduit CABLING ROUTE
Drawing Title
Sand PLAN
Scale Designed Drawn Checked Authorised
Original Size Date Date Date Date 0 100M 200M A3 Drawing Number Revision N
NE NW
W E
SW WB SE
S
Works 275kV CABLE ROUTE
El Sub Sta
Tank Tank
Cycle Path
WB
FABIAN WAY Cycle Path
El Sub Sta
40
34
Shelter
Elba Crescent
25 27 22
Track 19 18 Drain
ELBA CRESCENT Cycle Path
Track 13
FABIAN WAY 7
Cycle Path
Track Drain Drain Shelter
Cycle Path
Shelter
FABIAN WAY Drain Cycle Path
Path (um)
Rev. Date Description By Chk'd App'd
Drawing Status Suitability
Location SWANSEA BAY SWANSEA WALES
Client TIDAL LAGOON (SWANSEA BAY) PLC
Project Title 275kV CONNECTION Dunes DW CABLING ROUTE
DW Drawing Title
PLAN Dunes
Dunes Scale Designed Drawn Checked Authorised
Sand Original Size Date Date Date Date 0 100M 200M A3 Drawing Number Revision
Sand Dismantled Railway 0 Posts Outfall 100M
Cycle Path Crymlyn Burrows
Drain
FABIAN WAY
Cycle Path Crymlyn Burrows 200M Outfall Water
Drain El Sub Sta Sub El Collects
Drain Saltings Crymlyn Burrows
Drain
Drain
FABIAN WAY Crymlyn Burrows
Cycle Path Dunes Dunes Water Cycle Path
Outfall FFORDD AMAZON FFORDD
Drain Drain Drawing Number Original Size Scale Drawing Title Project Title Client Location Drawing Status Rev. A3 Date TIDAL LAGOON (SWANSEA BAY) PLC 275kV CONNECTION Date Designed CABLING ROUTE W SWANSEA BAY 275kV CABLE ROUTE SWANSEA
SW NW WALES Description PLAN Date Drawn
N S NE SE Date Checked E By Date Authorised Revision Suitability Chk'd App'd 0
Outfall FFORDD AMAZON FFORDD
Drain
Drain Drain Mud 100M
Drain Drain 200M Filling Station Normal Tidal Limit
Cycle Path
Drain
MHW MHW
A 483 Sand
Drain Drain Dunes Mud and Sand
A 483 Issues Mud
Mean High Water
Mean High Mean Water
Issues Lay-by
Mud and Sand Mean High Water High Mean Issues Valve Pit Pumping Station Drawing Number Original Size Scale Drawing Title Project Title Client Location Drawing Status Rev. A3 Date TIDAL LAGOON (SWANSEA BAY) PLC 275kV CONNECTION Date Designed CABLING ROUTE W SWANSEA BAY 275kV CABLE ROUTE SWANSEA
SW NW WALES Description PLAN Date Drawn
N S NE SE Date Checked E By Date Authorised Revision Suitability Chk'd App'd N
NE NW
W E
SW SE
S
Mean High Water 275kV CABLE ROUTE
Mud and Sand ED Bdy
Track Mean High Water River Neath
(Afon Nedd) Shingle Mud and Sand CCLW
Mean High Water Breakwater
Baglan Bay
Mud and Sand Valve Pit Dunes
ED Bdy ED Bdy CCLW MHW Und Mud and Sand Pumping Station Shingle River Neath (Afon Nedd)
Sand and Mud
MP
Mean High Water Pipeline
MP
Pilot Beacon
Shingle MP
Mean High Water MP
Mean High Water Pipeline
Sand
Shingle
Mean High Water
Sand
Baglan Bay
ED Bdy CCLW River Neath (Afon Nedd)
Sand
Rev. Date Description By Chk'd App'd Breakwater Sand Drawing Status Suitability
Shingle
Location SWANSEA BAY Sand SWANSEA WALES Sand Sand
Client
Baglan Bay TIDAL LAGOON (SWANSEA BAY) PLC
Mean High Water Pipe Line Project Title Pipe Line 275kV CONNECTION CABLING ROUTE
Drawing Title
PLAN
Scale Designed Drawn Checked Authorised
Original Size Date Date Date Date 0 100M 200M A3 Drawing Number Revision 0 MP
Mean High Water
Sand Sand Baglan Bay
MP
Shingle
Pipe Line Pipe Mean High Water High Mean 100M
CCLW 200M
Mean High Water
Railway (Dismantled)
Breakwater
ED Bdy ED Und
Baglan Bay Railway (Dismantled) Und Power Station
Sand ED Bdy ED
ETL FF Pond Drawing Number Original Size Scale Drawing Title Project Title Client Location Drawing Status Rev. A3 Date TIDAL LAGOON (SWANSEA BAY) PLC 275kV CONNECTION Date Designed CABLING ROUTE W SWANSEA BAY 275kV CABLE ROUTE SWANSEA
SW NW WALES Description PLAN Date Drawn
N S NE SE Date Checked E By Date Authorised Revision Suitability Chk'd App'd