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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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Future baseline Construction (2017) 6.3.37 Volume 5: Appendix CT-004-000 provides details of the developments which are assumed to have been implemented by 2017.

6.3.38 A planning application has been granted for mineral extraction at Denham Park Farm.

This site lies partially within the land required temporarily for construction of the Proposed Scheme. If development of the resource takes place, any surviving buried archaeological remains at this site will have been partially removed prior to construction of the Proposed Scheme.

Operation (2026) 6.3.39 No committed developments have been identified in this local area that will materially alter the baseline conditions in 2026.

6.3.40 None have been identified which will alter the condition of any cultural heritage assets in a manner which affects the assessment of the Proposed Scheme’s likely impacts and effects.

Effects arising during construction 6.4 Avoidance and mitigation measures 6.4.1 The draft CoCP sets out the provisions that will be adopted to control effects on cultural heritage assets. The provisions include the following (see Volume 5: Appendix

CT-003-000):

 management measures that will be implemented for assets that are to be retained within the land required for the construction of the Proposed Scheme (draft CoCP, Section 8);

CFA Report – Colne Valley/No7 | Cultural heritage

 the preparation of project wide principles, standards and techniques for works affecting heritage assets (draft CoCP, Section 8);

 a programme of archaeological investigation and recording to be undertaken prior to/or during construction works affecting the assets (draft CoCP, Section 8); and  a programme of historic building investigation and recording to be undertaken prior to modification or demolition of the assets (draft CoCP, Section 8).

6.4.2 The following design measures have been incorporated into the design of the

Proposed Scheme to reduce impacts on assets:

 planting of vegetation between Juniper Wood and Little Halings Wood and north of Little Halings. These areas of planting will consolidate existing bands of woodland to provide a more continuous visual screen to the Proposed Scheme from the direction of Denham (CVA013); and  planting around the National Grid feeder station south of South Harefield and existing copses in this area will be augmented to provide a more continuous band of screening from Harefield (CVA068).

6.4.3 Planting and implementation of landscaping will not detract from the historical landscape context of any assets.

Assessment of impacts and effects Temporary effects 6.4.4 The construction works, comprising excavations and earthworks and including temporary works such as construction compounds, storage areas and diversion of existing roads and services have the potential to affect heritage assets during the construction period. Impacts will occur to assets both within the land required, temporarily or permanently, for the construction of the Proposed Scheme and assets in the wider study area due to the visibility of plant, cranes and equipment and other construction factors. For further information on construction durations see Section 2.

6.4.5 The following significant effects will occur as a result of impacts to the setting of heritage assets within the land required, temporarily or permanently, for construction of the Proposed Scheme.

6.4.6 The Proposed Scheme and associated construction will extend in a broadly south-east to north-west direction approximately 350m north-east of Savay Farm (CVA023) an asset grouping of high value. The historical coherence of this site lies almost entirely within the built fabric, character and appearance of the listed buildings that make up the grouping. Any legible historical context to its setting exists only to the south linking with the potential medieval earthwork (CVA024). The historic landscape context to the east has been removed by gravel extraction and formation of the Colne Valley lakes. The high visibility of construction activities associated with the Colne Valley viaduct and associated disturbance will, however, detract from the otherwise semi-rural setting immediately surrounding the buildings for a period of approximately five years. Construction activities will also form a backdrop for any

CFA Report – Colne Valley/No7 | Cultural heritage

views from the west, which is the principal direction of access and the direction from which this asset can best be appreciated. This will result in a medium adverse impact and a major adverse effect.

6.4.7 The Proposed Scheme and associated construction work will extend in a broadly south-east to north-west direction approximately 350m north-east of the scheduled monument of a mound to the south of The Savay (CVA024) an asset of high value.

The historic landscape context to the east has been removed by gravel extraction and formation of the Colne Valley lakes. The visibility of the Colne Valley viaduct and significant construction noise (identified in Section 11 of this report) will detract from the semi-rural setting immediately surrounding the buildings over a period of approximately five years. The construction of the viaduct will form a backdrop for any views from the west which is the principal direction of access and the direction from which this asset can best be appreciated. This will result in a medium adverse impact and a major adverse effect.





Cumulative effects 6.4.8 It is not considered that there will be any cumulative effects from temporary impacts on heritage assets within the study area.

Permanent effects 6.4.9 The following significant effects will occur as a result of physical impacts on heritage assets within the land required, temporarily or permanently, for construction of the Proposed Scheme.

6.4.10 Buried archaeological remains associated with the Mesolithic activity at Dew’s Farm (CVA021) an asset of moderate value, will be entirely removed during construction.

Construction activity will comprise construction of the Colne Valley viaduct with associated haul routes, temporary spoil storage, access routes and landscaping. This will constitute a high adverse impact resulting in a major adverse effect.

6.4.11 The historical significance of Dew’s Farm (CVA022) lies predominantly in its probable 14th to 18th century construction and any buried archaeology that will be associated with the probable medieval occupation at the site. Some further value is lent to the building as the birth place of Cecil John Kinross V.C. Although unlisted, it is of moderate value and will be demolished and any buried archaeological remains removed during construction of the Colne Valley viaduct. This will constitute a high adverse impact resulting in a major adverse effect.

6.4.12 Thames Terrace deposits which will be removed near the two tunnel portals and the Colne Valley viaduct, Colne Valley viaduct south embankment satellite compound, Colne Valley viaduct satellite compound, Colne Valley roadhead, National Grid feeder station and Ickenham auto-transformer feeder station are known to contain Palaeolithic artefacts and deposits of moderate value (CVA044). Removal of any insitu buried archaeological remains of Palaeolithic and Mesolithic date will constitute a medium adverse impact resulting in a moderate adverse effect.

6.4.13 Buried archaeological remains of prehistoric to Roman date, of moderate value, will be removed at Denham Park Farm and Chenies (CVA076) by the establishment of

CFA Report – Colne Valley/No7 | Cultural heritage

temporary spoil storage, permanent engineered embankments, landscaping and planting. This will constitute a high adverse impact resulting in a major adverse effect.

6.4.14 Buried archaeological remains of the former post-medieval garden at The Fisheries (CVA034) an asset of low value, will be removed during the establishment of temporary stockpiling, a haul route and a balancing pond. This will constitute a high adverse impact resulting in a moderate adverse effect.

6.4.15 Approximately 1ha of the ancient woodland at Battlesford Wood (CVA045) an asset of high value will be removed during construction. Construction will comprise the establishment of a haul route, the Colne Valley viaduct and environmental mitigation.

This will constitute a low adverse impact resulting in a moderate adverse effect.

6.4.16 Buried archaeological remains of the former 19th century garden at Denham Grove (De Vere Hotel) (CVA073) an asset of low value, will be removed during construction by the establishment of a haul route, the Colne Valley viaduct north launch satellite compound, the Colne Valley viaduct north approach embankment and landscaping.

This will constitute a high adverse impact resulting in a moderate adverse effect.

6.4.17 Buried archaeological remains of potential prehistoric date and of low value off Tilehouse Lane (CVA080) will be removed by the establishment of a haul route, temporary spoil storage, construction of the Tilehouse Lane cutting, Tilehouse Lane overbridge, West Hyde auto-transformer station, Chiltern tunnel main construction compound, landscaping and plantings. This will constitute a high adverse impact resulting in a moderate adverse effect.

6.4.18 Buried remains of a World War II searchlight battery at Corner Hall (CVA084) an asset of low value, will be removed by the establishment of a haul route, temporary spoil storage the Tilehouse Lane Cutting, Tilehouse Lane overbridge, West Hyde autotransformer station, Chiltern tunnel main construction compound, landscaping and planting. This will constitute a high adverse impact resulting in a moderate adverse effect.

6.4.19 No significant effects will occur as a result of permanent impacts on the setting of heritage assets.

Permanent cumulative effects 6.4.20 There are no inter-project effects on cultural heritage.

Other mitigation measures 6.4.21 Refinements to the mitigation measures incorporated into the design of the Proposed Scheme or included in the draft CoCP will be considered during detailed design to reduce further the significant effects described above. These refinements will include

the identification of:

6.4.22 suitable locations for advanced planting to reduce impacts on the setting of assets;

and 6.4.23 locations where the physical impact on below ground assets can be reduced through the design of earthworks.

CFA Report – Colne Valley/No7 | Cultural heritage

Summary of likely residual significant effects 6.4.24 As no mitigation beyond that described has been identified, the residual effects are the same as those reported in the permanent effects section.

6.4.25 The temporary effects of construction activity on the setting of heritage assets are largely reversible in nature and last for the duration of the construction works.

Residual effects will arise from the visibility of construction plant and in particular the loss of vegetation which forms part of the setting of assets.

6.4.26 The physical impacts of construction on heritage assets are permanent and not reversible, heritage assets will be removed.

Archaeology 6.4.27 A number of archaeological assets will be permanently lost due to the construction of the Proposed Scheme that will be significant. These assets include the remains associated with Mesolithic activity (CVA021) and medieval occupation (CVA022) at Dew’s Farm, Palaeolithic and Mesolithic remains in the Thames Terrace deposits (CVA44), Roman remains at Denham Park Farm and Chenies (CVA076) and postmedieval archaeology associated with the 19th century garden at Denham Grove (De Vere Hotel). A programme of archaeological works will be prepared to investigate, analyse, report and archive these assets.

Listed and non-listed historic buildings 6.4.28 The Proposed Scheme will result in the demolition of Dew’s Farm (a locally listed building, CVA022) that will be significant. A programme of built heritage works will be prepared to investigate, analyse, report and archive this asset.

Setting and historic landscape 6.4.29 The Proposed Scheme will sever elements of the historic landscape that will be significant, for example the ancient woodland at Battlesford Wood (CVA045). The introduction of the Colne Valley viaduct will change the setting of several heritage assets, including the Grade I listed Savay Farm (CVA023), and The Savay scheduled monument (CVA024). Further consideration will be given to the historic vegetation and landscapes as part of the planting and landscape design.

Effects arising from operation 6.5 Avoidance and mitigation measures 6.5.1 The following design measures have been incorporated into the design of the

Proposed Scheme to reduce the impacts and effects on assets:

 noise mitigation measures have been included within the scheme design to reduce potential impacts on identified assets; and  landscape planting to reduce the potential impacts derived from changes to the setting of identified assets.

CFA Report – Colne Valley/No7 | Cultural heritage

Assessment of impacts and effects 6.5.2 The assessment considers the Proposed Scheme once operational and all effects are considered to be permanent. There will be no physical impacts on buried archaeological remains or other heritage assets arising from the operation of the Proposed Scheme. Impacts on the setting of heritage assets arising from the physical presence of the Proposed Scheme are described as permanent occurring within the construction phase and are not repeated in detail here, albeit that they will endure through the operation of the Proposed Scheme. Where there is a combined effect on the setting of an asset from the presence of the constructed Scheme and its operation, this is reported in the assessment of operation.

6.5.3 The following significant environmental effects will occur as a result of permanent

changes to the setting of any assets arising from the impacts of railway operation:

6.5.4 Savay Farm (CVA023) an asset grouping of high value, lies in an area which will be subject to significant operational noise due to passing trains (see Section 11). The setting is presently semi-rural and this contributes to the appreciation of this asset and therefore its value. This will constitute a medium adverse impact resulting in a major adverse effect.

6.5.5 The scheduled monument of a mound to the south of The Savay (CVA024) an asset of high value, lies in an area which will be subject to significant operational noise due to the passage of trains (see Section 11). The setting is presently semi-rural and this contributes to the appreciation of this asset and therefore its value. This will constitute a medium adverse impact and therefore a major adverse effect.

Cumulative effects 6.5.6 Assessment of inter-project effects on cultural heritage assets arising from the interaction of the Proposed Scheme with cumulative development projects has been undertaken. These are listed in Section 2.1 and, Volume 5: Appendix CT-004-000. No significant cumulative effects have been identified in relation to cultural heritage.

Other mitigation measures 6.5.7 The Proposed Scheme includes a number of design measures to address potential impacts and significant effects. No additional operational mitigation measures beyond those included within the Proposed Scheme design have been identified.

Summary of likely residual significant effects 6.5.8 The setting of several assets will be significantly affected visually and by noise once the Proposed Scheme becomes operational. This includes Savay Farm (CVA023) and The Savay (CVA024). In due course visual effects will reduce as planting matures and the new railway assimilates into the landscape. Operational noise will remain a significant residual effect.

CFA Report – Colne Valley/No7 | Cultural heritage

–  –  –

7 Ecology

Introduction

7.1 7.1.1 This section describes the ecological baseline and identifies likely impacts and significant ecological effects that will arise from the construction and operation of the Proposed Scheme. These include impacts on species, habitats and sites designated for their importance for nature conservation.



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