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Llanwern Rail Facilities - Phase 1 Planning Water Quality Assessment Report September 2018 Transport for Wales (TfW) 367590-WTD-CAR-2657 Mott MacDonald Fitzalan House Fitzalan Road Cardiff CF24 0EL United Kingdom T +44 (0)29 2046 7800 F +44 (0)29 2047 1888 mottmac.com Transport for Wales (TfW) Southgate House Wood Street Llanwern Rail Facilities - Cardiff 367590-WTD-CAR-2657 CF10 1EW Phase PiMS 1 Planning Mott MacDonald Water Quality Assessment Report September 2018 Mott MacDonald Limited. Registered in England and Wales no. 1243967. Registered office: Mott MacDonald House, 8-10 Sydenham Road, Croydon CR0 2EE, Transport for Wales (TfW) United Kingdom 367590-WTD-CAR-2657 Mott MacDonald | Llanwern Rail Facilities - Phase 1 Planning Water Quality Assessment Report Issue and Revision Record Revision Date Originator Checker Approver Description A 19/09/2018 K. Bishop M. Ross L. Strickland Draft Issue – For TfW Review Only B 28/09/2018 K. Bishop M. Ross L. Strickland Issue for Pre-Application Consultation Document reference: 367590-WTD-CAR-2657 Information class: Standard This document is issued for the party which commissioned it and for specific purposes connected with the above- captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it. This Repor t has been prepared solely for use by the party which commissioned it (the 'Client') in connection with the captioned project. It should not be used for any other purpose. No person other than the Client or any party who has expressly agreed terms of reliance with us (the 'Recipient(s)') may rely on the content, information or any views expressed in the Report. This Repor tis confident ial and contains propriet ary intellectual property and we accept no duty of care, responsibility or liability to any other recipient of this Report. No representation, warrant yor undertaking, expr ess or implied, is made and no responsibilit y or liability is accepted by us to any par ty other than the Client or any Recipient(s), as to the accuracy or completeness of the inf ormation contained in this Repor t. For the avoidance of doubt this Report does not in any way purport to include any legal, insurance or financial advice or opinion. We disclaim all and any liability whether arising in tort, contract or ot herwise which we might otherwise have to any party ot her than the Client or the Recipient(s), in respect of this Report, or any information contained in it. We accept no responsibility for any error or omission in the Report which is due to an error or omission in data, inf ormation or statements supplied to us by other par ties including the Client (the 'Data'). We have not independently verified the Data or otherwise examined it to deter mine the accuracy, complet eness, sufficiency for any purpose or feasibility for any particular outcome including financial. For ecast s presented in this document were prepared using the Data and the Report is dependent or based on the Data. Inevitably, some of the assumptions used to develop the forecasts will not be realised and unanticipat ed events and circumstances may occur. Consequently, we do not guarantee or warrant the conclusions contained in the Report as there are likely to be differences between the forecasts and the actual results and those differences may be material. While we consider that the inf ormation and opinions given in this Repor tare sound all par ties must rely on their own skill and judgement when making use of it. I nf or m ation and opinions are current only as of the date of the Report and we accept no responsibility for updating such inf or mation or opinion. It should, ther efore, not be assumed that any such infor mation or opinion continues to be accurate subsequent to the date of the Report. Under no circumstances may this Report or any extract or summar y thereof be used in connection with any public or private securities offer ing including any relat ed memorandum or prospectus for any secur ities offering or stock exchange listing or announcement. By acceptance of this Report you agree to be bound by this disclaimer. This disclaimer and any issues, disput es or claims arising out of or in connection with it (whether contractual or non-contract ual in nature such as claims in tort, from breach of statute or regulation or other wise) shall be gover ned by, and construed in accordance with, the laws of England and Wales to the exclusion of all conflict of laws principles and rules. All disputes or claims arising out of or relating to this disclaimer shall be subject to the exclusive jurisdiction of the English and Welsh courts to which the parties irrevocably submit. 367590-WTD-CAR-2657 | September 2018 PiMS Mott MacDonald | Llanwern Rail Facilities - Phase 1 Planning Water Quality Assessment Report Contents 1 Introduction 1 1.1 Project Description 1 1.2 Scope of Works 1 1.3 Site Location 1 1.4 Purpose of this Technical Note 2 2 Water environment baseline 3 2.1 Baseline water environment 3 2.2 WFD Waterbodies 3 2.3 Protected Areas 4 2.4 Gwent Levels Water Quality Requirements 4 3 Water Quality Assessment 5 3.1 Potential Risks to Water Quality 5 3.2 Mitigation of Risks to Water Quality 5 4 Summary and Conclusions 7 Appendices 8 A. Drainage Ditches 9 B. NRW Advice Note 11 367590-WTD-CAR-2657 | September 2018 PiMS Mott MacDonald | Llanwern Rail Facilities - Phase 1 Planning 1 Water Quality Assessment Report 1 Introduction 1.1 Project Description Mott MacDonald has been commissioned by Transport for Wales (TfW), on behalf of Welsh Government, to prepare and submit a planning application, seeking full planning permission for the design and construction of a 1.6km long Major Events Stabling Line (MESL) on land adjacent to the existing Tata Steelworks Service Lines in Llanwern, South Wales. This is Phase 1 of the Llanwern Rail Facilities Programme. The MESL will be used for stabling of rolling stock for major events in the area, to enable flexibility for future train requirements, and proving of trains prior to use on the rail network. The MESL will be electrified in a future phase of work. This proposed 1.6km length of MESL to the west of Monks’ Ditch was formerly known as Option 6a. The wider Llanwern Rail Facilities Programme will include an extension of the MESL by circa 2.4km east (to achieve a total length of circa 4km), electrification of the MESL, a new Llanwern railway station and passenger line (including Park & Ride and footbridge), and connections to the South Wales Main Line (Relief Lines). The further phases of the project will be the subject of a subsequent planning application. The key parameters for the Scheme are listed below: ● Whole Site area is 3.1 hectares. This land is contained within the red line boundary shown on the Site Location Plan (Drawing number 367590-MMD-48-XX-DR-C-0001); and ● The Site length is approximately 1.6km long and 19m wide. 1.2 Scope of Works The General Arrangement drawings (Drawing numbers 367590-MMD-48-XX-DR-C-0002 to 367590-MMD-48-XX-DR-C-0005) demonstrate the project scope which includes the design and construction of the following: ● A single track stabling line (MESL) circa 1.6km long; ● Associated earthworks and landscaping; and ● Drainage and other engineering works. In order to obtain full planning permission for Phase 1, we have carried out the outline design and technical assessment of the above scope, as well as multiple assessments in terms of ecology, environment, heritage and archaeology. 1.3 Site Location The proposed rail development Site is located approximately 8 miles east from the centre of Newport, South Wales (Figure 1.1). The Site is aligned roughly west – east and bordered by the existing South Wales Mainline to the north and the Tata Steelworks to the south. Along the southern boundary of the steelworks site runs the A4810 which links the M4 from junction 23A at Magor with the A48 at Liswerry (a predominantly residential suburb on the south-eastern side of Newport. The site is more widely bordered by the M4 which runs approximately two and a half miles to the north and the Severn 367590-WTD-CAR-2657 | September 2018 PiMS Mott MacDonald | Llanwern Rail Facilities - Phase 1 Planning 2 Water Quality Assessment Report Estuary which lays approximately three miles to the south. The Gwent Levels to the south is a significant area of wetlands. The existing South Wales Mainline passes north of the proposed Site and provides opportunity for transport links for both passengers and freight. Figure 1.1: Proposed Location Plan Source: OS Open Data 1.4 Purpose of this Technical Note This Technical Note comprises a high-level assessment of the impact that the Scheme has on the water environment, specifically, on water quality. For the purposes of this assessment, the term ‘water environment’ includes surface waterbodies within the Site, and within 1km downstream of the Site (which includes waterbodies within the Gwent Levels SSSI). The Technical Note adopts a simple approach, outlining the baseline water environment, identifying and evaluating potential impacts the Scheme could have on water quality.