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«LONDONWEST MIDLANDS ENVIRONMENTAL STATEMENT Volume 2 | Community Forum Area report CFA7 | Colne Valley November 2013 ES 3.2.1.7 VOL LondonWest Midlands ...»

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Greater London Authority (2011) The London Plan: Spatial Development Strategy for Greater London The Regional Strategy for the East of England (Revocation) Order 2012 Buckinghamshire County Council (1991) Buckinghamshire Structure Plan 1991-2011: Saved Policies Buckinghamshire County Council (2012) Minerals and Waste Core Strategy Development Plan Document Chiltern District Council (2011) Core Strategy for Chiltern District Chiltern District Council (2011) Chiltern District Local Plan, Adopted September 1997. Consolidated September 2007 and November 2011 Hertfordshire County Council (2012) Waste Core Strategy Hertfordshire County Council (2007) Hertfordshire Minerals Local Plan Review 2002-2016, Adopted march 2007 Hertfordshire County Council (2007) Supplementary Planning Document, Mineral Consultation Areas in Hertfordshire London Borough of Hillingdon (2011) Hillingdon Core Strategy, Submission Draft London Borough of Hillingdon (1998) Adopted Unitary Development Plan, Saved Policies South Bucks District Council (2011) Core Strategy Development Plan Document South Bucks District Council (1999) South Bucks District Local Plan, Adopted March 1999, Consolidated September 2007 and February 2011 CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme  Three Rivers District Council Core Strategy (2011)15;

 Three Rivers District Council Development Management Policies Local Development Document (2013)16; and  Three Rivers District Council Local Plan 1996-2011 Updated Policies (2011)17.

2.1.22 There are a number of key planning and environmental designations in the area, including Air Quality Management Areas (AQMA) (see Map AQ-01-007, Volume 5, Air Quality Map Book), listed buildings and conservation areas (see Map Series CT-10, Volume 2, CFA7 Map Book).

2.1.23 Emerging policies are not considered within this report. However it should be noted that during 2013 the LBH intends to prepare and consult on various components of Part 2 of the Hillingdon Local Plan which will consist of the Development Management Policies, Site Specific Allocations and an associated Proposals Map.

2.1.24 South Bucks District Council has also noted its intention to produce Development Management and Townscape Character DPD over the coming year but that has yet to be adopted and as such is not considered within this assessment.

2.1.25 The Local Development Framework Delivery DPD (Development Management Policies), which is expected to be adopted in late 2014/early 2015, will replace many of the existing Saved Policies from the Chiltern Local Plan.

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Three Rivers District Council (2011) Core Strategy Three Rivers District Council (2013) Development Management Policies Local Development Document Proposed Submission, July 2012, Track changes Version Main and Additional Modifications Three Rivers District Council (2011) Three Rivers Local Plan 1996-2011, Word Version following the adoption of the Core Strategy in October 2011 CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme cumulative scheme between 2017-2026 during construction of the Proposed Scheme and post-2026 during operation of the Proposed Scheme. It is considered to be a receptor for the operation of the Proposed Scheme but also potentially to give rise to cumulative construction impacts with the Proposed Scheme on its neighbours. It is referred to in those topic sections where such a cumulative impact has been identified.

2.1.29 Planning applications yet to be determined and sites that are proposed allocations in development plans that have yet to be adopted, on or close to the Proposed Scheme, are termed ‘proposed developments’. These are listed, Volume 5 Appendix CT-004-000. They are not included in the assessment. The progress of these proposals is being monitored by HS2 Ltd.

Description of the Proposed Scheme 2.2 2.2.1 The following section describes the main features of the Proposed Scheme in the Colne Valley area, including the main environmental mitigation measures. Further generic information on typical permanent features is provided in Volume 1, Section 5.

Similarly, a general description of the approach to mitigation is set out in Volume 1, Section 9.

2.2.2 The Proposed Scheme will require some land on a permanent basis, key features of which are illustrated in Maps CT-06-019 to CT-06-023 (Volume 2, CFA7 Map Book).

Land that will also be required, but only on a temporary basis for construction, is set out in Section 2.3.

2.2.3 In general, features are described from south to north along the route (and east to west for features that cross HS2).

2.2.4 Since the draft ES was published the following changes have been introduced to

permanent features of the Proposed Scheme:

 additional environmental mitigation measures have been incorporated into the Proposed Scheme including habitat creation within the lakes in the Colne Valley;

 a new access road to the Denham Park Quarry from Tilehouse Lane;

 an area of sustainable placement of excavated material has been added to the east of Harvil Road; and  refinement of the design of crossings at the River Colne and Newyears Green Bourne.

Overview 2.2.5 The Proposed Scheme through the Colne Valley area will be approximately 5.7km in length. It will commence from the boundary of the existing Harvil Road alignment, north of Ickenham and will proceed north-west on a viaduct through the Colne Valley, passing west of South Harefield and east of Denham Green, over the Grand Union Canal, Mid Colne Valley SSSI, River Colne, a number of lakes and A412 Denham Way/North Orbital Road.





CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

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HS2 trains will draw power from overhead power line, requiring feeder stations and connections to the 400kV National Grid network. In addition to feeder stations, smaller auto-transformer stations will be required at more frequent intervals. One National Grid feeder station, one autotransformer feeder station and one auto-transformer station will be required in the local area.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

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All replacement floodplain storage areas will be re-graded to tie back into existing ground level and returned to agriculture, wherever the farming practices are compatible with the land use.

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme Battlesford Wood, for the enhancement of existing vegetation to offset the loss of woodland from the Proposed Scheme;

 an area of ecological mitigation located at the eastern end of Broadwater Lake, approximately 350m east of the Proposed Scheme and River Colne, to create a series of islands for nesting birds;

 a strip of planting to allow the regeneration of willow and alders along the River Colne, on the south-western boundary of Broadwater Lake to mitigate the loss of woodland and provide additional habitat for nesting birds;

 a number of balancing ponds for railway drainage, located to the west and east of the Proposed Scheme, north of the River Colne up to Bridleway DEN/3. The ponds will be located at approximately 200m intervals to discharge surface water runoff into the River Colne and its tributaries;

 reinstatement of existing planting along the viaduct up to the boundary of A412 Denham Way/North Orbital Road;

 a strip of reedbed along the western boundary of Broadwater Lake to compensate for the loss of wetland habitat from the Mid Colne SSSI and SMI;

 realignment of Bridleway DEN/3 around the southern end of the Colne Valley north embankment. The approaches to the realigned route will be planted to integrate the structure into the landscape;

 noise fence barriers approximately 600m in length and 3m high on the west side of the Proposed Scheme along the top of the approach embankment and then continuing along the base of the cutting, starting from the end of Colne Valley viaduct northwards;

 noise fence barriers approximately 250m in length and 3m high on the east side of the Proposed Scheme along the top of the approach embankment, starting from the end of Colne Valley viaduct northwards;

 strips of planting along the Colne Valley north embankment and Tilehouse Lane to mitigate views of the railway and overbridge from the surroundings;

 an area of planting in a field bounded by Tilehouse Lane, Bridleway DEN/3, Little Halings Wood and a field between Little Halings Wood and Juniper Wood to maintain connectivity to the surrounding ancient woodland and to compensate for the loss of vegetation from the Mid Colne SSSI; and  passive provision for HS2 Phase Two Heathrow spur, this includes the provision of an underground box structure, passing primarily under the Colne Valley north embankment to allow the possible future provision of the Heathrow spur without impacting on the operational capacity of HS2 Phase One.

2.2.8 Construction activities within this section will be managed from eight satellite compounds, in seven locations, including the Colne Valley viaduct and south embankment, Colne Valley viaduct, Colne Valley viaduct storage, Colne Valley viaduct CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme jetty storage, Colne Valley viaduct laydown, Colne Valley viaduct north launch, Colne Valley viaduct north embankment and the Ickenham auto-transformer feeder station satellite compounds (see Section 2.3).

Tilehouse Lane cutting, West Hyde embankment and Chiltern tunnel south cutting 2.2.9 The Proposed Scheme will continue north-west from the Colne Valley north embankment and enter the Tilehouse Lane cutting which will be approximately 710m long and up to 11m deep. It will then continue onto the West Hyde embankment which will be approximately 690m long and up to 10m high and enter the Chiltern tunnel south cutting which will be approximately 215m long and up to 16m deep. This section of the Proposed Scheme will extend from approximately 150m north of Bridleway DEN/3 to approximately 200m south of the M25. Key features of this section, which is approximately 1.6km long, will include (see Maps CT-06-021 to

CT-06-022, Volume 2, CFA7 Map Book):

 landscape earthworks on the north-east side of the Proposed Scheme from north of Bridleway DEN/3 up to approximately 450m east of the M25 to provide noise screening.

 landscape earthworks to the south-west of the Proposed Scheme from north of Bridleway DEN/3 up to approximately 100m east of the M25, to provide visual screening of the railway from the surrounding areas;

 a strip of planting along the eastern side of A412 Denham Way/North Orbital Road up to the junction with Chalfont Lane to provide visual screening for the residents of West Hyde;

 a balancing pond for railway drainage located east of the Proposed Scheme, north of Bridleway DEN/3 and west of A412 Denham Way/North Orbital Road, with an associated access road from A412;

 strips of planting along the east and western boundary of Tilehouse Lane cutting to screen views of the railway from the surroundings;

 new retaining wall structures to the west and east of the Proposed Scheme, between the HS2 Phase One railway and Phase Two Heathrow spur alignment.

The structures will support the Proposed Scheme as the Phase Two Heathrow spur alignment diverges from the Phase One alignment. The retaining wall will be required where the difference in level between the Heathrow spur and the Proposed Scheme is such that normal grading of earthworks is insufficient.

This will ensure the future provision of the Phase Two Heathrow spur without impacting on the operational capacity of Phase One of HS2;

 an overbridge up to approximately 1m above existing ground level, providing a realignment of Tilehouse Lane and Bridleway Rickmansworth 004 over the Proposed Scheme. The approaches to the overbridge will be planted to integrate the structure into the landscape and a new access road to Denham Park Farm Quarry site from Tilehouse Lane overbridge will be provided;

CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

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Porous portals are perforated structures at tunnel portals (entrances), usually formed of concrete and designed to allow the passage of air from the tunnel. These are required to reduce both air pressure changes and the noise generated when a high speed train associated with the Proposed Scheme, enters or leaves a tunnel CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme  an associated land drainage area to the north of Chalfont Lane;

 realignment of Bridleway CSP/44, from the east side of the M25 and south of Chalfont Lane bridge, around the western side of the Chiltern tunnel south portal and cutting;

 a new Scottish and Southern Energy (SSE) substation located 100m north of Chalfont Lane, east of the M25 with associated access road from Chalfont Lane;

 areas of planting extending from the western end of Chalfont Lane along the east side of the M25 and on the west side of the M25, to the south of Hornhill Road, to screen views of the Proposed Scheme from the local residents of Horn Hill; and  twin bore tunnels which will be circular in cross-section and measure approximately 8.8m in internal diameter. Within this CFA the depth of the tunnels will vary between approximately 10m and 15m below ground level depending on surface topography.

2.2.12 Construction of this section will be managed from the Chiltern tunnel main compound and the Chiltern tunnel south portal satellite compound (see Section 2.3).

2.2.1 The route will then continue into CFA8 in the Chiltern tunnel.

Construction of the Proposed Scheme 2.3 2.3.1 This section sets out the strategy for the construction of the Proposed Scheme in the

Colne Valley area including:

 overview of the construction process;

 description of the advance works;

 description of the engineering works to build the railway;

 construction waste and material resources  commissioning the railway; and  indicative construction programme (see Section 2.3).

2.3.2 The assessment presented in this ES is based on the construction arrangements as described in this section.

2.3.3 In addition to the land that will be required permanently by the Proposed Scheme (see Section 2.2) land will be required on a temporary basis for construction. Key temporary construction features are illustrated on the construction maps series CT-05 (Volume 2, CFA7 Map Book). Following construction works, land required temporarily will be prepared for its eventual end use, which will include being returned to its preconstruction use wherever reasonably practicable.

2.3.4 A guide to standard construction techniques is provided in Volume 1, Section 6. In instances for which more than one possible construction technique might be possible, CFA Report – Colne Valley/No 7 | Overview of the area and description of the Proposed Scheme

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Overview of the construction process 2.3.5 Building and preparing the railway for operation will comprise the following general

stages:

 advance works including site investigations further to those already undertaken, preliminary mitigation works and preliminary enabling works;

 civil engineering works including establishment of construction compounds, site preparation and enabling works, main earthworks and structure works, site restoration and removal of construction compounds;

 railway installation works including establishment of construction compounds, infrastructure installation, connections to utilities, changes to the existing rail network and removal of construction compounds; and  system testing and commissioning.

2.3.6 General provisions that will guide the construction process are set out in more detail in Volume 1, Section 6.4 and the draft CoCP (see Volume 5: Appendix CT-003-000)

including:

 the approach to environmental management during construction and the role of the Code of Construction Practice (draft CoCP, Section 3);



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