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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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9.4.107 At night there will be middle ground construction lighting from the Colne Valley viaduct main construction compound and the Chiltern tunnel main construction compound. The lighting will be set within an otherwise predominantly dark landscape, with the exception of light spill from the M25 in the west of the view. The magnitude of change is therefore considered to be medium.

9.4.108 The medium magnitude of change, assessed alongside the high sensitivity of the receptor, will result in a moderate adverse effect.

Cumulative effects 9.4.109 Section 2.1 and Appendix CT-004-000 identify developments with planning permission or sites allocated in adopted development plans, on or close to the Proposed Scheme. These are termed ‘committed developments’ and will form part of

–  –  –

the baseline for the construction of the Proposed Scheme. The consequential cumulative effect of these developments on LCA and viewpoints is described below.

9.4.110 Due to the combined presence of construction activity and plant of the Proposed Scheme and consented Denham Park Farm quarry, effects on the following receptors, which are significant when considering the construction of the Proposed Scheme on

its own, will be exacerbated:

 Maple Cross Slopes South LCA;

 viewpoints located along Old Shire Lane PRoW; and  viewpoints on Tile House Lane.

9.4.111 In this area there are no known instances where receptors that will not be significantly affected by the construction of the Proposed Scheme on its own, will be significantly adversely affected by the combined presence of construction activity and plant from the surrounding developments.

Other mitigation measures 9.4.112 To further reduce the significant effects described above, consideration of where planting can be established early in the construction programme will be given during the detail design stage. This may include consideration of early planting in ecological mitigation sites which would have the additional benefit of providing some visual screening. However, not all landscape and visual effects can be practicably mitigated due to the visibility of construction activity and the sensitivity of surrounding receptors. Therefore, no other mitigation measures are considered practicable during construction.

Summary of likely residual significant effects 9.4.113 The temporary residual significant effects during construction remain as described above. These effects will be temporary and reversible in nature lasting only for the duration of the construction works. Any residual effects will generally arise from the widespread presence of construction activity and construction plant within the landscape and viewed from surrounding residential receptors, and users of PRoW and main roads within the study area.

Permanent effects arising during operation 9.5 9.5.1 The specific elements of the Proposed Scheme that have been taken into account in

determining the effects on landscape and visual receptors includes:

 Harvil Road realignment and public bridleway bridges;

 Colne Valley viaduct;

 Ickenham auto-transformer feeder station and West Hyde auto-transformer station;

 the National Grid feeder station;

 Tilehouse Lane cutting;

CFA Report – Colne Valley/No7 | Landscape and visual assessment

–  –  –

Avoidance and mitigation measures 9.5.2 The operational assessment of impacts and effects is based on year 1 (2026), year 15 (2041) and year 60 (2086) of the Proposed Scheme. A process of iterative design and assessment has been employed to avoid or reduce adverse effects during the operation of the Proposed Scheme. Measures that have been incorporated into the

design of the Proposed Scheme include:

 embankment and cuttings, both for the route and highway realignments, have been shaped so as to integrate the Proposed Scheme into the character of the surrounding landscape. Planting will reflect tree and shrub species native to the UK and characteristic of the local LCA;

 balancing ponds will be integrated into the landscape to alleviate flooding and also provide opportunities for biodiversity; and  planting, including native broad-leaved woodland, shrub and hedgerows, will be implemented along various sections of the route to screen the Proposed Scheme from neighbouring residential properties and users of adjacent PRoW and to aid integration of the Proposed Scheme into the landscape. The selection of species will take into account possible climate change impacts associated with the quality and availability of water and the potential increase in pests and diseases.

9.5.3 These measures have been taken account of in the assessment of the operational effects below.

Assessment of impacts and effects 9.5.4 The likely significant effects on the LCA and viewpoints in operation will arise from new engineered landforms and structures cutting across the existing landscape including a new viaduct with associated infrastructure. There will also be permanent land severance, the introduction of noise fence barriers, of highway infrastructure into the semi-rural environment including road bridges, of overhead power lines and the introduction of regular high speed trains. At a number of locations, views of the Proposed Scheme will be filtered or screened by rising landform, retention of intervening hedgerows and trees and the route of the Proposed Scheme within a cutting. Furthermore, effects will reduce over time as planting established as part of the Proposed Scheme matures, notably at the landward ends of the Colne Valley

–  –  –





viaduct. In the vicinity of the viaduct, given its scale, the planting will not always be sufficient to provide screening, even in the long term.

Landscape assessment 9.5.5 This section describes the significant effects on LCA during year 1, year 15 and year 60 of operation. Non-significant effects on LCA are presented, Volume 5 Appendix LVPart 4.

9.5.6 The assessment of effects by year 15 assume proposed planting has grown by approximately 450mm a year (i.e. trees will be 7-7.5m high). The assessment of effects by year 60 assumes all planting has reached its fully mature height.

Harefield Farmland Valley Slopes LCA 9.5.7 The Proposed Scheme will enter the Colne Valley on embankment, from the eastern boundary of the LCA. The introduction of the Colne Valley viaduct and associated overhead line equipment and trains will introduce elements that will noticeably alter the tranquillity although this is considered within the context of the current Chiltern Main Line which traverses this LCA. Harvil Road will be realigned and the Ickenham auto-transformer feeder station will be located adjacent to the road. There will also be a National Grid feeder station and an associated overhead power line which will be realigned further to the east. These large scale features will introduce prominent built elements into the landscape altering the character of the landscape. The overhead power line diversion will be partly in this area but also within CFA6 and will be subject to further design development in conjunction with National Grid. Mitigation planting adjacent to the Proposed Scheme in particular the Ickenham auto-transformer feeder station and National Grid feeder station, will not have matured sufficiently to integrate the Proposed Scheme into the surrounding landscape by year 1.

9.5.8 Tranquillity will be affected by the trains travelling frequently along the Proposed Scheme, although they will be set in the context of the existing Chiltern Main Line.

Overall, the magnitude of change is therefore considered to be medium.

9.5.9 The medium magnitude of change, assessed alongside the high sensitivity of the LCA will result in a major adverse effect by year 1of operation.

9.5.10 By year 15 the proposed planting will have started to integrate and screen the National Grid feeder station. The overhead power line diversion will still be a prominent element within the landscape and the Colne Valley viaduct will still perceptible to the west of the LCA. This will result in a medium magnitude of change.

9.5.11 The medium magnitude of change, assessed alongside the high sensitivity of the LCA will result in a moderate adverse effect.

9.5.12 By year 60 of operation, the maturity of planting will help to integrate the Proposed Scheme into the landscape resulting in effects becoming non-significant. This is reported, Volume 5: Appendix LV-001-007 Part 4.

Colne River Valley LCA 9.5.13 The proposed 3.4km long viaduct will pass through the River Colne Valley LCA spanning the various water bodies along the valley floor. The viaduct will be CFA Report – Colne Valley/No7 | Landscape and visual assessment approximately 11-15m in height and with a noise fence barrier up to 3m high. The viaduct will also be noticeable as it spans the Grand Union Canal, including the tow path and Moorhall Road.

9.5.14 To accommodate the viaduct, the existing overhead power line will be removed and redirected within the Colne Valley and south of the Chiltern Main Line. This will improve a sense of isolation in those areas where it has been removed but reduce the sense of isolation where it has been introduced.

9.5.15 Planting to replace vegetation removed during construction along the lakeside and the River Colne will not have re-established in 2026 when operation commences.

9.5.16 Tranquillity will be most noticeably impacted by the trains travelling across the viaduct in this semi-rural and densely vegetated landscape. The existing lakeside vegetation will lessen the presence of the viaduct within the valley but ultimately the scheme will reduce the sense of isolation and tranquillity in the valley.

9.5.17 The introduction of the proposed viaduct and associated trains will introduce a large scale and dominant built feature to this previously isolated landscape and will be out of character with the surrounding LCA therefore resulting in a high magnitude of change.

9.5.18 The high magnitude of change, assessed alongside the high sensitivity of the LCA will result in a major adverse effect.

9.5.19 By year 15 and beyond to year 60, the large scale viaduct and associated trains will still be prominent, however replaced vegetation will have re-established and reformed the connectivity of the lakeside vegetation. Therefore, the magnitude of change is considered to be medium.

9.5.20 The medium magnitude of change, assessed alongside the high sensitivity of the LCA, will result in a moderate adverse effect by year 15 and year 60 of operation.

Colne Valley LCA 9.5.21 During operation the northern part of the LCA will be directly impacted by the presence of the Colne Valley north embankment and the passive provision for the Phase 2 Heathrow spur, together with the loss of areas of woodland. This will introduce uncharacteristic elements within the LCA. The proposed 3.4 km long viaduct will pass through Colne Valley LCA spanning the various water bodies within the floor of the valley. The viaduct will be approximately 11 to 15m in height, will span the water on piers located approximately every 40m and with noise fence barriers up to 3m in height. The scale of such a structure traversing the Colne Valley and the adjacent River Colne Valley LCA will adversely impact the landscape character within Colne Valley LCA. The reinstated vegetation will not have re-established by 2026 when operation commences.

9.5.22 Tranquillity will be affected by the trains travelling across the viaduct, in an otherwise quiet and enclosed landscape. The viaduct and associated trains will introduce large scale infrastructure into the adjacent LCA and the northern edge of this LCA.

Therefore, the magnitude of change is considered to be medium.

CFA Report – Colne Valley/No7 | Landscape and visual assessment

9.5.23 The medium magnitude of change, assessed alongside the high sensitivity of the LCA, will result in a moderate adverse effect.

9.5.24 By year 15 and beyond to year 60 of operation, reinstatement planting will have matured helping integrate the Proposed Scheme into the landscape resulting in effects becoming non-significant. This is reported, Volume 5: Appendix LV-001-007 Part 4.

Maple Cross Slopes South LCA 9.5.25 Tilehouse Lane overbridge and the Tilehouse Lane cutting will be prominent within the landscape. The distributed excavated material will be re-profiled to reflect the gentle undulating landform which is largely characteristic of the existing setting. Due to the characteristic open views available across the valley, elements of the Chiltern tunnel south portal will be perceptible within the landscape.

9.5.26 Tranquillity will be most noticeably affected by the trains travelling in and out of the portal although this will be set in the context of considerable existing traffic noise and activity from the M25 road corridor.

9.5.27 During year 1 when operations commence the proposed mitigation planting will not have had time to establish. The additional new features will form prominent elements within the landscape. The introduction of the Proposed Scheme will noticeably alter the tranquillity of the character area. Therefore the magnitude of change is considered to be medium.

9.5.28 The medium magnitude of change, assessed alongside the medium sensitivity of the LCA, will result in a moderate adverse effect.

9.5.29 By year 15 and beyond to year 60 of operation, the maturity of proposed mitigation planting alongside the Proposed Scheme and Chiltern tunnel south portal will further integrate the Proposed Scheme into the landscape resulting in effects becoming nonsignificant. This is reported, Volume 5: Appendix LV-001-007 Part 4.

Chalfont St Peter South LCA 9.5.30 The Proposed Scheme will not directly pass through the Chalfont St Peter South LCA.

However, the presence of the Proposed Scheme in the adjacent Maple Cross Slopes South LCA (approximately 400m away) will affect the setting and tranquillity of this LCA. However this will be set in the context of considerable existing traffic noise and activity from the M25 and the new mineral extraction sites at Denham Park Farm.

9.5.31 The proposed mitigation planting located in the adjacent LCA will not have had time to establish and integrate the Proposed Scheme into the receiving landscape by 2026.

The magnitude of change is therefore considered to be medium within Chalfont St Peter South LCA.

9.5.32 The medium magnitude of change, assessed alongside the medium sensitivity will result in a moderate adverse effect.

9.5.33 By year 15 and beyond to year 60 of operation, the maturity of mitigation planting within the adjacent Maple Cross LCA will help to integrate the Proposed Scheme into CFA Report – Colne Valley/No7 | Landscape and visual assessment the landscape resulting in effects becoming non-significant within Chalfont St Peter South LCA. This is reported, Volume 5 Appendix LV-001-007 Part 4.

Visual assessment 9.5.34 This section describes the significant effects on visual receptors during year 1, year 15 and year 60 of operation. Non-significant effects on visual receptors are presented, Volume 5: Appendix LV-001-007 Part 4.

9.5.35 For each viewpoint the following assessments have been undertaken:

 effects during winter of year 1 of operation;

 effects during summer of year 1 of operation;

 effects during summer of year 15 of operation; and  effects during summer of year 60 of operation.

9.5.36 Where significant effects have been identified, an assessment of effects at night time arising from additional lighting has also been undertaken.

9.5.37 The number identifies the viewpoint locations which are shown on Maps LV-04-024b to LV-04-027a (Volume 2, CFA7 Map Book). In each case, the middle number (xxx.x.xxx) identifies the type of receptor that is present in this area – 2: Residential, 3:

Recreational, 4: Transport, 6: Employment and 7: Active Sport.

9.5.38 Where a viewpoint may represent multiple types of receptor, the assessment is based on the most sensitive receptors. Effects on other receptor types with a lower sensitivity may be lower than those reported.



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