«LONDONWEST MIDLANDS ENVIRONMENTAL STATEMENT Volume 2 | Community Forum Area report CFA7 | Colne Valley November 2013 ES 184.108.40.206 VOL LondonWest Midlands ...»
Volume 2 | Community Forum Area report
CFA7 | Colne Valley
Volume 2 | Community Forum Area report
CFA7 | Colne Valley
High Speed Two (HS2) Limited has been tasked by the Department for
Transport (DfT) with managing the delivery of a new national high speed rail network. It is a non-departmental public body wholly owned by the DfT.
A report prepared for High Speed Two (HS2) Limited:
High Speed Two (HS2) Limited, Eland House, Bressenden Place, London SW1E 5DU Details of how to obtain further copies are available from HS2 Ltd.
Telephone: 020 7944 4908 General email enquiries: HS2enquiries@hs2.org.uk Website: www.hs2.org.uk High Speed Two (HS2) Limited has actively considered the needs of blind and partially sighted people in accessing this document. The text will be made available in full on the HS2 website.
The text may be freely downloaded and translated by individuals or organisations for conversion into other accessible formats. If you have other needs in this regard please contact High Speed Two (HS2) Limited.
Printed in Great Britain on paper containing at least 75% recycled fibre.
CFA Report – Colne Valley/No 7 | Contents Contents Contents i 1 Introduction 3
1.1 Introduction to HS2
1.2 Purpose of this report
1.3 Structure of this report 2 Overview of the area and description of the Proposed Scheme 7
2.1 Overview of the area
2.2 Description of the Proposed Scheme
2.3 Construction of the Proposed Scheme
2.4 Operation of the Proposed Scheme
2.5 Community forum engagement
2.6 Route section main alternatives 3 Agriculture, forestry and soils 55
3.2 Scope, assumptions and limitations
3.3 Environmental baseline
3.4 Effects arising during construction
3.5 Effects arising from operation 4 Air quality 71
4.2 Scope, assumptions and limitations
4.3 Environmental baseline
4.4 Effects arising during construction 4.5
Structure of the HS2 Phase One Environmental Statement
The Environmental Statement (ES) documentation comprises:
Non-technical summary (NTS) – which provides a summary in non-technical language of the Proposed Scheme, the likely significant environmental effects of the Proposed Scheme, both beneficial and adverse, and the means to avoid or reduce the adverse effects;
Volume 1: Introduction to the Environmental Statement and the Proposed Scheme – This describes High Speed Two (HS2), and the environmental impact assessment process, the approach to consultation and engagement, details of the permanent features and generic construction techniques as well as a summary of main strategic and route-wide alternatives and local alternatives (prior to 2012) considered;
Volume 2: Community forum area reports and map books – 26 reports and associated map books providing a description of the scheme and of environmental effects in each area;
Volume 3: Route-wide effects – provides an assessment of the effects of the Proposed Scheme where it is not practicable to describe them within the CFA descriptions in Volume 2;
Volume 4: Off-route effects – provides an assessment of the off-route effects of the Proposed Scheme;
Volume 5: Appendices and map books – contains supporting environmental information and associated map books; and Glossary of terms and list of abbreviations – contains terms and abbreviations, including units of measurement, used throughout the ES documentation.
CFA Report – Colne Valley/No 7 | Strocture
1 Introduction Introduction to HS2 1.1 1.1.1 High Speed Two (HS2) is a new high speed railway proposed by the Government to connect major cities in Britain. Stations in London, Birmingham, Leeds, Manchester, South Yorkshire and the East Midlands will be served by high speed trains running at speeds of up to 360kph (225mph).
1.1.2 HS2 is proposed to be built in two phases. Phase One, the subject of this ES, will involve the construction of a new railway line of approximately 230km (143 miles) between London and Birmingham. Construction will begin in 2017 and the line will become operational by 2026; with a connection to the West Coast Main Line (WCML) near Lichfield and to the existing HS1 railway line in London.
1.1.3 During Phase One beyond the dedicated high speed track, high speed trains will connect with and run on the existing WCML to serve passengers beyond the HS2 network to destinations in the north. A connection to HS1 will also allow some services to access that high speed line through east London and Kent and connect with mainland Europe via the Channel Tunnel.
1.1.4 Phase Two will involve the construction of lines from Birmingham to Leeds and Manchester; with construction commencing approximately 2023, and planned to be operational by 2033.
1.1.5 Section 4 of Volume 1 describes the anticipated operational characteristics of HS2, including the anticipated frequency of train services. As Volume 1 shows, the frequency of trains is expected to increase over time and to increase further upon opening of Phase Two. In assessing the environmental effects of the Proposed Scheme the anticipated Phase 2 operational frequency has been used. For further detail of the anticipated operation of the Proposed Scheme in the Newton Purcell to Brackley area (CFA14), see Section 2.4.
1.1.6 The Government believes that the HS2 network should link to Heathrow and its preferred option is for this to be built as part of Phase Two. However, the Government has since taken the decision to pause work on the Heathrow link until after 2015 when it expects the Airports Commission to publish its final report on recommended options for maintaining the country’s status as an international aviation hub.
1.1.7 For consultation and environmental assessment purposes, the proposed Phase One route has been divided into 26 community forum areas (CFA), as shown in Figure 1.
This has enabled wider public engagement on the Proposed Scheme design and on the likely adverse and beneficial effects.
Purpose of this report 1.2 1.2.1 This CFA report presents the likely significant effects of the construction and operation of the Proposed Scheme on the environment within CFA7 (Colne Valley).
The report describes the mitigation measures that are proposed for the purpose of CFA Report – Colne Valley/No 7 | Introduction avoiding, reducing or managing the likely significant adverse effects of the Proposed Scheme on the environment within CFA7.
Figure 1: HS2 Phase One route and community forum areas
Structure of this report 1.3 1.3.1 This report is divided into the following sections:
Section 1 – an introduction to HS2 and the purpose and structure of this report.
Section 2 – overview of the area, description of the Proposed Scheme within the area and its construction and operation, and a description of the main local alternatives.
Sections 3-13 – an assessment for the following environmental topics:
- water resources and flood risk (Section 13).
1.3.2 Each environmental topic section comprises: an introduction to the topic; a description of the environmental baseline within the area; the likely significant environmental effects arising during construction and operation of the Proposed Scheme; and proposed mitigation measures for any significant adverse effects.
1.3.3 Environmental effects have been assessed in accordance with the methodology set out in Volume 1, the Scope and Methodology Report (SMR) (see Volume 5: Appendix CT-001-000/1) and the SMR Addendum (see Volume 5: Appendix CT-001-000/2).
1.3.4 Where appropriate, potential climate change impacts and adaptation measures are discussed in the relevant environmental topic section. Volume 1 and Section 6A of the SMR Addendum also include additional information about climate change adaptation and resilience.
1.3.5 The maps relevant to Colne Valley are provided in a separate corresponding document entitled Volume 2: CFA7 Map Book, which should be read in conjunction with this report.
1.3.6 The Proposed Scheme described in this report is that shown on the Map Series CT-05 (construction) (Volume 2, CFA7 Map Book) and CT-06 (operation) (Volume 2, CFA7
CFA Report – Colne Valley/No 7 | Introduction
Map Book). There is some flexibility during detailed design to alter the horizontal and vertical alignments and other details within the limits shown on the plans and sections submitted to Parliament and as set out in the hybrid Bill, and this flexibility is included within the scope of the environmental assessment. Further explanation is provided in Volume 1, Section 1.4.
1.3.7 In addition to the environmental topics covered in Sections 3-13 of this report, electromagnetic interference is addressed in Volume 1 and climate (greenhouse gas emissions and carbon), and waste and material resources are addressed in Volume 3.
An assessment of potential environmental effects beyond the CFA has also been undertaken and this ‘off-route’ assessment is reported in Volume 4.
CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2 Overview of the area and description of the Proposed Scheme Overview of the area 2.1 2.1.1 The Colne Valley area covers approximately 5.7km of the Proposed Scheme in the London Borough of Hillingdon (LBH) and the districts of South Bucks, Chilterns and Three Rivers. The area extends from Harvil Road in the south-east, over the Colne Valley lakes to the M25 in a broadly north-westerly direction. The Proposed Scheme will pass through the parishes of Denham and Chalfont St Peter. The area also includes land within the Greater London Authority and Hertfordshire County that is not defined by parish boundaries.
2.1.2 As shown in Figure 2, South Ruislip to Ickenham CFA (CFA6) lies to the south-east of the Colne Valley area and the Chalfonts and Amersham CFA (CFA8) lies to the northwest.
Settlement, land use and topography 2.1.3 The Colne Valley area sits between the suburban fringe of London and the rural fringe of the Chilterns. Agricultural land is interspersed with urban development linked to commuter towns and villages. Urban areas include Ickenham, Denham and Denham Green between 250m to 1.4km to the south of the Proposed Scheme. West Hyde, Harefield and South Harefield are between 350m to 1.4km to the east of the Proposed Scheme and Maple Cross lies 650m to the north of Chalfont Lane. Chalfont St Peter, in CFA8, is 1.2km to the west of the M25.
2.1.4 The Colne Valley Regional Park that covers an area of approximately 110km² and includes the Mid Colne Valley Site of Special Scientific Interest (SSSI) is focused around the Colne Valley lakes, the Grand Union Canal and the River Colne and defines the central character of this area (see Map Series CT-10, Volume 2, CFA7 Map Book).
This mosaic of water features runs in a north-south direction and constitutes the remnants of gravel abstraction in the valley bottom. The lakes are divided by spurs of land that have become heavily wooded and which screen direct views around the area. The majority of these water features are now used for a range of leisure activities including sailing, fishing, water skiing, walking and bird watching.
2.1.5 Either side of the central wetland area the land use is predominantly arable but interspersed with urban fringe development and other recreational facilities, notably golf courses and the Denham Aerodrome.
CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme Figure 2: Area context map CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme
Notable community facilities 2.1.10 The main shops and services are located in the village of Denham Green, Denham, Harefield, South Harefield and Maple Cross (see Map Series CT-10, Volume 2, CFA7 Map Book). Denham Green is the closest to the Proposed Scheme and its main thoroughfare, the A412 Denham Way/North Orbital Road, comprises a small range of convenience shops, a post office, pharmacy, estate agents and a number of restaurants and cafes. There is one primary school, Tilehouse Combined School, which has approximately 180 pupils aged 4 to 11. The village has one doctor’s surgery, a dentist, an independent physiotherapy practice that specialises in treating children and a nursing home. There are a range of community facilities including Denham Village Memorial Hall and St Mark’s Church and Hall.
A DCA represents a community that, depending on the area, may consist of a local ward, neighbourhood or village(s).
data comes from the Office for National Statistics (2011) Population Census. DCA unemployment rates are aggregated in this section whereas in Section 10.3 they are provided for each DCA.
CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme 2.1.11 Harefield is the largest settlement along this section of the Proposed Scheme. Its High Street comprises a good range of shops and services, St Marys Church and Hall, The King’s Arms and The Harefield public houses. Close to the High Street are a public library and Harefield Infant and Junior School. There is one secondary school, The Harefield Academy, which caters for 11-18 year olds. There is a dentist and doctor’s surgery in Harefield (Fray’s Dental Centre and Harefield Health Centre).
2.1.12 South Harefield and Denham village are much smaller settlements and have fewer services. There is a small range of convenience shops, Harefield Community Centre and two churches in Denham village.
2.1.13 Maple Cross is in the northern part of the area and has a number of convenience stores, a post office, Maple Cross Junior Mixed and Nursery School and the Maple Cross and West Hyde Community Centre.
Recreation, leisure and open space 2.1.14 Informal and formal recreation spaces are provided by the Mid Colne Valley SSSI (including Broadwater Lake), Savay Lake, the Grand Union Canal, Northmoor Hill Wood Nature Reserve, Fray’s Nature Reserve and Denham Country Park (see Map Series CT-10 in Volume 2, CFA7 Map Book). These all form part of the wider Colne Valley Regional Park, which stretches from Staines in the south to Rickmansworth in the north and from Ickenham and Harefield in the east to Chalfont St Peter in the west. The regional park is made up of lakes, reservoirs, rivers, canals, woodland and arable farm land, interspersed with urban areas and linked by a network of PRoW.
2.1.15 Other main recreational facilities include Hillingdon Outdoor Activity Centre (HOAC) a water sports and activity centre for all ages, the Denham Aerodrome, the Denham Waterski Club and the Buckinghamshire, Denham and Uxbridge golf clubs. There are several playgrounds and informal open spaces in the area.
2.1.16 There are seven Conservation Areas within the Colne Valley. These include Denham (South Bucks), Denham Lock (Hillingdon), Harefield Village (Hillingdon), Denham Place and Village, Coppermill Lock (Hillingdon), Coppermill Lock (Three Rivers) and Widewater Lock (Hillingdon).
Policy and planning context Planning framework 2.1.17 Volume 1, Section 2.8 sets out policy and legislative framework under which the Proposed Scheme is being taken forward. Given that the Proposed Scheme is being developed on a national basis to meet a national need it is not included or referred to in many local plans. Nevertheless, in seeking to consider the Proposed Scheme in the local context, relevant local plan documents and policies have been considered in relation to environmental topics.
2.1.18 This area falls within three planning policy regions London, East of England and the South East of England.
CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme