Document

Transcription

Document

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Woodland Unit Target Numbers
Existing SBI Boundary
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14
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6
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12
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16
8
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15
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9
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Quay West at MediaCityUK
Trafford Wharf Road
Trafford Park
Manchester
Tel: 0161 872 3223
M17 1HH
email:
[email protected]
22
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.
WYG Environment
............
creative minds safe hands
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Site of Biological Interest Site Boundary
Scale at A3:
Drawn by: Date:
KB
Project No:
A071725
27/03/13
Office Type
Checked By: Date: Approved By: Date:
RK 27/03/13
45 94
Base map provided by: IBI Taylor Young
GW 27/03/13
Revision
Drawing No.
8.2
Reptile mats
Application boundary
Quay West at MediaCity UK
Trafford Wharf Road
Trafford Park
Tel: 0161 872 3223
Manchester
email:
M17 1HH
[email protected]
............
WYG Environment
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Reptile Survey
Scale at A3:
0
62.5
125
250 Metres
Project No:
A071725
Drawn by: Date:
AG 14/1/14
Office Type
45 94
RK 14/1/14
Drawing No.
8.4
CW 14/1/14
Revision
Tree with Bat Potential
Transect Routes
Surveyor Locations for Emergence
Built Structure with Bat Potential
Trafford Wharf Road
Trafford Park
Tel: 0161 872 3223
Manchester
email:
M17 1HH
[email protected]
............
WYG Environment
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Bat Activity Transect Routes
and Features of Bat Interest
Scale at A3:
Project No:
0
75
150
300 Metres
A071725
Drawn by: Date:
AG 15/1/14
Office Type
45 94
RK 15/1/14
Drawing No.
8.5
CW 15/1/14
Revision
1
TPO areas
TPO Trees
Trafford Wharf Road
Trafford Park
Manchester
Tel: 0161 872 3223
email:
M17 1HH
[email protected]
WYG Environment
............
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Tree Preservation Orders
Scale at A3:
0
75
150
300 Metres
Project No:
Drawn by: Date:
A071725-5
AG 15/1/14
Office Type
45 94
RK 15/1/14
Drawing No.
CW
8.6
15/1/14
Revision
1
Scattered Scrub
Scattered Tree
Target Note
Dry ditch
Intact Hedgerow Species Rich
Running Water
30
Species Poor Hedgerow
23
Arable
24
4
8
2
5
6
Built Structure
22
1
Dense Scrub
3
7
Dry Pond
31
Hardstand
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45
10
34
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44
21
Marshy Grassland
Tall Ruderal
42
46
39
35
9
43
20
Standing Water
18 41
Swamp
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36
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27
Semi-improved Grassland
17
Broadleaved Woodland
38
11
15
25
37
40
26
12
14
13
Trafford Wharf Road
Trafford Park
Tel: 0161 872 3223
Manchestser
email:
M17 1HH
[email protected]
WYG Environment
............
Project
Barrowcroft Wood
HIMOR Group
Drawing Title:
Phase 1 Habitat Map
Scale at A3:
0
62.5
125
250 Metres
Drawn by: Date:
Project No:
A071725-5
AG 15/1/14
Office Type
45 94
RK 15/1/14
Drawing No.
CW 15/1/14
8.7
Revision
1
Legend
GCN Pond
Pond 1
Ponds
Pond 2
Pond 4
Pond 3
Pond 5
Pond 6
Pond 7
Pond 10
Pond 9
Pond 8
Pond 11
Trafford Wharf Road
Trafford Park
Tel: 0161 872 3223
Manchester
email:
M17 1HH
[email protected]
............
WYG Environment
Pond 16
Pond 12
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Pond 14
Confirmed GCN Pond
Pond 13
Pond 15a & 15b
0
125
250
500 Metres
Scale at A3:
Project No:
A071725-5
Drawn by: Date:
AG 15/1/14
Office Type
45 94
RK 15/1/14
Drawing No.
8.8
CW 15/1/14
Revision
1
Confirmed Tree Roost
Commuting Activity
Foraging Activity
Trafford wharf Road
Trafford Park
Tel: 0161 872 3223
Manchester
email:
M17 1HH
[email protected]
............
WYG Environment
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Bat Survey Results
Scale at A3:
0
75
150
300 Metres
Project No:
Drawn by: Date:
AG 15/1/14
A071725-5
Office Type
45 94
RK 15/1/14
Drawing No.
8.9
GW 15/1/14
Revision
1
Legend
Persimmon Homes and Morris
Homes 'Rectory Fields' Application
Site
Barrowcroft Wood Development
Application Site
Bradley Hall Trading Estate
Application
Trafford Wharf Road
Trafford Park
Manchester
Tel: 0161 872 3223
email:
M17 1HH
[email protected]
WYG Environment
............
Project
Barrowcroft Wood
HIMOR GROUP
Drawing Title:
Cumulative Impacts
Scale at A3:
Project No:
0
125
250
500 Metres
A071725
Drawn by: Date:
AG 15/1/14
Office Type
45 94
RK 15/1/14
Drawing No.
GW 15/1/14
8.10
Revision
1
Application by: HIMOR Group Ltd
Site: Land at North of Rectory Lane, Standish, Wigan
Environmental Statement: Volume 2 – Main Text
9.
FLOOD RISK AND SURFACE WATER DRAINAGE
Introduction
9.1
This chapter summarises the Flood Risk and Surface Water Drainage Assessment,
contained in Volume 3: Technical Appendix 9.1, undertaken in accordance with the proforma guidance contained in the Department for Communities and Local Government
document ‘Technical Guidance to the National Planning Policy Framework’ dated March
2012.
9.2
This chapter provides an overview of the prevailing surface water drainage and flood risk
characteristics of the site. It identifies the potential flooding risks associated with
demolition and construction works and, when completed, the operational phase.
Appropriate mitigation measures are outlined in order to prevent, reduce or offset
identified potential effects and the resulting residual effects are summarised accordingly.
Legislation and Policy
National Planning Policy
9.3
The National Planning Policy Framework (NPPF) was published in March 2012 and
replaced the previous document PPS25.
9.4
The NPPF advises consultation with the Environment Agency, who has a lead role in
providing advice on flood issues at a strategic level and in relation to planning applications.
Regional Policy
9.5
The application area is covered by the Wigan Council Level 2 Hybrid Strategic Flood Risk
Assessment which was produced in April 2011 by JBA Consulting following on from the
Greater Manchester Sub-Regional SFRA produced in August 2008.
9.6
This SFRA was based on the (now replaced) PPS25 document although no significant
changes in the sequential approach or definition of Flood Zones have occurred in the
NPPF.
Assessment Methodology
9.7
The following section describes the methods used to assess the significance of impacts on
surface water drainage and flood risk.
9.8
The FRA on which this chapter is based was completed in accordance with the NPPF
Technical Guidance and is included in Volume 3: Technical Appendix 9.1. The following
points were considered:
EIA2-V2-9069-JC-HL
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139
·
Current baseline conditions, including geology, potential sources of flooding and
surface water drainage.
·
Impacts of the development on flood risk to receptors within and outside the
site
·
Mitigation measures to, where possible, provide net benefits to receptors by
reducing flood risk.
Sources of Information
9.9
9.10
The following sources of information were used:
·
The Environment Agency website (environment-agency.gov.uk)
·
National Planning Policy Framework Technical Guidance (March 2012)
·
Wigan Council Level 2 Hybrid Strategic Flood Risk Assessment (April 2011)
·
The SuDS Manual (CIRIA/C697) 2007
·
The Building Regulations 2000: Drainage and Waste Disposal.
Throughout the FRA, the potential impacts of climate change have been taken into
account in accordance with the NPPF Technical Guidance.
Baseline Conditions
Site Description
9.11
The site is located on the north eastern periphery of Standish, Wigan, Lancashire. The
national Ordnance Survey grid reference for the centre of the site is E 357250, N 410530
at post code WN6 0XA. The site is bounded by Bradley Hall Trading Estate to the north,
Rectory Lane and Rectory Farm to the south, rural land to the east and land with a
resolution to grant planning permission for residential housing to the west.
Sources of Potential Flooding
Fluvial
9.12
Following liaison with the Environment Agency, the site is concluded to lie entirely within
Flood Zone 1 and therefore the development site is assessed as having less than a 1 in
1000 chance of flooding in any year in accordance with the National Planning Policy
Framework Technical Guidance dated March 2012.
Foul and Surface Water Drainage
9.13
From discussions with United Utilities, there are no historical records of flooding from
sewers, highway drainage, overland flow or groundwater and the site is not shown to be
at risk from coastal inundation flooding.
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Surface Water Features
9.14
The nearest significant watercourse to the site is Bradley Brook, located approximately
300m east of the site boundary. An unnamed watercourse is located adjacent to the north
eastern section of the site and flows from west to east, discharging into Bradley Brook. It
is proposed to positively drain attenuated post development surface water into this
unnamed tributary which in turn will discharge into Bradley Brook
Geology
9.15
The BGS 1:10,560 geological map of the area shows the site to be underlain by Devensian
glacial till deposits which in turn are underlain by carboniferous sandstone of the
Pemberton Member and mudstone, siltstone and sandstone of the Pennine Middle Coal
Measures Formation.
Surface Water Drainage
9.16
From a review of the United Utilities sewer record drawings, the following adopted surface
water sewers lie adjacent to the site:
·
Surface water 300mm sewer beneath Copeland Drive extending from south to
north, 200m west of development site.
·
Combined (450mm becoming 375mm) sewer beneath Standish Court Golf Course
extending from north west to south east, 250m south west of the development
site.
·
Combined 525mm sewer extending from north to south, 300m east of the
development site.
Assessment of Impact and Significance
Demolition and Construction
Risk from Fluvial Flooding
9.17
The development proposals will result in an increase in impermeable areas on the site,
which could cause an increase in quantity and rate of run-off. It is therefore appropriate to
consider the effects during construction as well as on completion of the project, although
maximum increase in risk is likely to occur once the development is complete.
Risk from Surface Water Drainage Flooding
9.18
Construction stage earthworks operations, temporary site drainage associated with
construction works and blockages / obstructions of drains all have potential to give rise to
change in surface water runoff regimes in the absence of mitigation.
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Completed Development
9.19
1000 chance of flooding in any year according to the National Planning Policy Framework
Technical Guidance dated March 2012. Therefore the risk of fluvial flooding on site is
currently considered to be Negligible.
9.20
The proposed new development building footprints are outside the Zone 2 & 3 flood zones
and there will therefore be no loss of flood plain volume requiring consideration during the
1 in 100 year enhanced flood event.
Risk from Surface Water Drainage Flooding
9.21
The Wigan Council Hybrid Strategic Flood Risk Assessment dated April 2011 requires that
the post development surface water discharge rate does not increase from current
greenfield runoff rates and hence a restricted discharge rate for the post development site
will apply.
9.22
The detailed design of the post development site surface water drainage system will be
verified by micro drainage simulation in accordance with United Utilities requirements for
no surface flooding to occur during a site critical 1 in 30 year storm event. On site
attenuation to limit the rate of surface water discharge will be designed using 1 in 100
year rainfall intensities that have been increased by 20% to allow for the effects of climate
change. This will permit the design to comply with both United Utilities design
requirements, the Environment Agency stipulation of no generation of off site overland
flood flows from the post development site and the Wigan Council Hybrid Strategic Flood
Risk Assessment Volume II dated April 2011.
Mitigation
9.23
This section identifies the design principles incorporated / designed into the proposed
development that prevent potential adverse impacts on the development proposals.
9.24
Where appropriate, all construction will be carried out in accordance with the DTLR
document ‘Interim Guidance for Improving the Flood Resistance of Domestic and Small
Business Properties’ and ‘Improving the Flood Performance of New Buildings. Flood
Resilient Construction. 2007.’
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9.25
The impact of the development on flood risk during construction is considered neutral. No
mitigation is therefore required to address flood risk in the construction phase.
Surface Water Drainage
9.26
The issue of surface water drainage to the proposed development has been considered
with reference to the hierarchy of surface water disposal as noted in the Building
Regulations H3:
9.27
1)
Sustainable urban drainage systems (SUDS).
2)
Discharge of surface water off site direct to watercourse.
3)
Discharge to adopted sewer.
On the basis of the ground conditions recorded on site, the use of sustainable urban
drainage systems is considered unlikely to be appropriate for the development site due to
the impermeable nature of the glacial till deposits on site. However, sustainable urban
drainage measures will be built into the on site surface water drainage system through the
construction of the discharge control (hydrobrake) and attenuation system which will
positively drain suitably attenuated post development surface water that will subsequently
discharge into Bradley Brook via an unnamed watercourse.
9.28
Internal floor levels and vulnerable areas will be raised by 150mm above the car parking
areas and site roads to ensure they will not be susceptible to flooding from local on site
blockages within the surface water drainage system.
Cumulative impact
9.29
On site attenuation to limit the rate of surface water discharge will be designed using 1 in
100 year rainfall intensities that have been increased by 20% to allow for the effects of
climate change. This will comply with the Environment Agency stipulation that all site
generated flows will remain within the site in a 1 in 100 year plus climate change event.
This will ensure there are no negative impacts in terms of risk from fluvial flooding on the
adjacent
proposed
developments
at
Standish
Golf
Club
(application
reference
A/13/78636), the proposed residential development for 425 No. dwellings at Almond Brook
(A/13/78828) to the west of the site and the partial redevelopment of Bradley Hall Trading
Estate (application reference A/13/77974) to the north of the site.
EIA2-V2-9069-JC-HL
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Residual Effects
9.30
The impact of the development on flood risk during construction is considered Negligible.
Risk from Surface Water Flooding
9.31
With careful maintenance of surface water drainage flow routes and connections during
construction, the potential construction related surface water flooding effect will be
Negligible.
9.32
1000 chance of flooding in any year according to the National Planning Policy Framework
Technical Guidance dated March 2012. Therefore the risk of fluvial flooding on site after
construction will remain Negligible.
Risk from Surface Water Flooding
9.33
A post development discharge rate for the site of 6 litres per second is proposed. The
drainage design requirement will ensure the surface water discharge rate from the post
development site does not exceed the current greenfield runoff for the site and therefore
the development will have a Negligible significance in terms of risk from surface water
flooding.
Summary and Conclusions
9.34
This chapter provides an overview of the prevailing surface water drainage and flood risk
characteristics of the site. It identifies the potential flooding risks associated with
demolition and construction works and, when completed, the operational phase.
Appropriate mitigation measures are outlined in order to prevent, reduce or offset
identified potential effects and the resulting residual effects are summarised accordingly.
9.35
Following liaison with the Environment Agency, the site was concluded to lie entirely within
Flood Zone 1 and therefore the development site has less than a 1 in 1000 chance of
flooding in any year according to the NPPF Technical Guidance.
9.36
On the basis of the ground conditions recorded on site, the use of sustainable urban
drainage systems is considered unlikely to be appropriate for the development site due to
EIA2-V2-9069-JC-HL
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the impermeable nature of the glacial till deposits on site. However, sustainable urban
drainage measures will be built into the on site surface water drainage system through the
construction of the discharge control (hydrobrake) and attenuation system which will
positively drain suitably attenuated post development surface water into the unnamed
watercourse adjacent to the north eastern section of the site prior to discharge into
Bradley Brook
9.37
A post development discharge rate for the site of 6 litres per second per hectare is
proposed. The drainage design requirement will ensure the surface water discharge rate
from the post development site does not exceed the current greenfield runoff for the site
and therefore the development will have a Negligible significance in terms of risk from
surface water flooding.
9.38
The residual effect of demolition and construction on flood risk from fluvial and surface
water drainage is considered to be Negligible.
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10.
GROUND CONDITIONS AND CONTAMINATION
Introduction
10.1
The following chapter presents a description and assessment of the impacts of the
proposed development on the geology and hydrogeology, including potential mineral
deposits, beneath and surrounding the site at the proposed residential development site in
Standish. Constraints posed by the ground conditions on the proposed development also
are considered.
10.2
The main policy document particularly relevant to this chapter of the Environmental
Statement is the recently published National Planning Policy Framework (NPPF), published
in March 2012. The NPPF replaced the following documents which were of direct relevance
to these elements of the Environmental Statement:
10.3
1)
Planning Policy Statement 23: Planning and Pollution Control, 2004
2)
Minerals Policy Statement 1: Planning and Minerals,2006
Planning Policy Statement 23 (PPS 23) addressed the prevention of water pollution and
provided guidance on the location of and the appropriateness of certain ‘polluting’
developments so as to prevent pollution and ensure that the environment and human
health were protected.
10.4
Section 120 of the NPPF states that:-
To prevent unacceptable risks from pollution and land instability,
planning policies and decisions should ensure that new
development is appropriate for its location. The effects (including
cumulative effects) of pollution on health, the natural
environment or general amenity, and the potential sensitivity of
the area or proposed development to adverse effects from
pollution, should be taken into account. Where a site is affected
by contamination or land stability issues, responsibility for
securing a safe development rests with the developer and/or
landowner.
10.5
In addition, Section 121 requires that the ground conditions at development sites are
suitable for the proposed use after the completion of any necessary remediation
measures:-
EIA2-V2-9069-JC-HL
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10.6
Planning policies and decisions should also ensure that:
·
the site is suitable for its new use taking account of ground conditions and land
instability, including from natural hazards or former activities such as mining,
pollution arising from previous uses and any proposals for mitigation including
land remediation or impacts on the natural environment arising from that
remediation;
·
after remediation, as a minimum, land should not be capable of being
determined as contaminated land under Part IIA of the Environmental Protection
Act 1990; and
·
adequate site investigation information, prepared by a competent person, is
presented.
10.7
It is essential that there is an adequate and steady supply of mineral material, but that
this provision is made in accordance with the principles of sustainable development.
Minerals development is different from other forms of development because minerals can
only be worked where they naturally occur. The NPPF requires that local planning
authorities should identify Mineral Safeguarding Areas and adopt appropriate policies to
ensure that known areas of mineral resources are not needlessly sterilised by non-mineral
developments. Section 13 of the document considers potential conflicts of development
located on sites of potential exploitable minerals to ensure a steady and adequate supply
of aggregates and industrial minerals.
Legislation
10.8
The relevant legislation with regard to geology, hydrogeology and contaminated land are
summarised below.
1)
Environmental Protection Act, 1990 - Defines within England, Scotland and
Wales the legal framework for duty of care for waste, contaminated land and
statutory nuisance.
2)
The Environment Act, 1995 - Establishes the Environment Agency and SEPA as
the regulatory bodies for contaminated land, control of pollution, conservation or
enhancement of the environment and fisheries.
3)
Contaminated Land (England) Regulations, 2006 SI 1380 - Sets out provisions
relating to the identification and remediation of contaminated land. Identifies
sites requiring regulation as 'special sites' and adds land contaminated by
radioactive substances to this classification.
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4)
Groundwater (England and Wales) Regulations, 2009 - Empowers the
Environment Agency in England and Wales to prevent direct or indirect
discharge of certain dangerous substances to groundwater and control pollution
resulting from the discharge of those and other substances.
5)
Environmental Damage (Prevention and Remediation) Regulations, 2009 SI 153
– Regulations to ensure that the environment is fully protected against the most
serious environmental damage, to surface or ground water, contamination of
land where there is a significant risk to human health or serious damage to EU
protected natural habitats and species or damage to Sites of Special Scientific
Interest (SSSI’s).
6)
Groundwater Directive (2006/118/EC) – Establishes a regime which sets water
quality standards for groundwater and introduces measures to prevent or limit
inputs of pollutants into groundwater.
10.9
Available reports and published information have been reviewed with the aim of
identifying the geological and hydrogeological conditions within and surrounding the
proposed residential site development. This data review established the geological strata
beneath the site (including any potential mineral deposits), made an assessment of the
engineering properties of the soils / rocks and identified areas of potentially contaminated
land and potential land instability. It also identified potential pollutant linkages and
facilitated a preliminary risk assessment for each of the identified pollutant linkages.
10.10
The aforementioned Geo-Environmental Assessment and Ground Engineering reports were
carried out in accordance with the guidance provided in the following documents:
1)
Contaminated Land Risk Assessment: A guide to good practice, CIRIA C552,
2001.
2)
Code of Practice for Site Investigations, BS 5930:1999.
3)
Investigations of Potentially Contaminated Sites –
Code of Practice, BS
10175:2001.
4)
Model Procedures for the Management of Land Contamination, CLR 11, 2004.
Baseline Conditions
10.11
The following section presents the baseline geological, hydrogeological and hydrological
conditions together with information on potential areas of contaminated ground beneath
and immediately surrounding the site.
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Site History
10.12
The site is located in a rural / residential area on the north eastern periphery of Standish,
Lancashire. The site is bound by Bradley Hall Trading Estate and Barrowcroft Wood to the
north, Rectory Lane and the abutting Rectory Farm to the south, rural land to the east and
residential housing to the west. The site is elevated at between circa 79m above Ordnance
Datum (AOD) on the eastern site boundary and circa 85m AOD on the western site
boundary. The site consists of lightly vegetated land, arable farm land, hedgerows and a
wooded area.
10.13
A review of historical maps indicates that the site is Greenfield. The site consists of rural
land including numerous trees and hedgerows.
Geology
10.14
A review of the BGS geological map of the site indicates that it is underlain by superficial
natural deposits beneath the site will consist of glacial till which is underlain by
Westphalian B Coal Measures and numerous geological faults on or abutting the site.
10.15
These superficial deposits are underlain by Westphalian B Coal Measures with multiple coal
seams noted to outcrop beneath the site (Bulldog Mine, Deep Yard Mine, Ince Four Foot
Mine and potentially Ince Seven Foot Mine). The western boundary / western site
extremity is split by the St. Catherines Fault which trends approximately north to south
across the site downthrowing to the east (across the site). The northern site boundary is
formed by a further fault trending approximately trending west to east across the site. A
further conjectured fault is noted trending north to south across the central section of the
site.
Hydrogeology
Groundwater Resources
10.16
The site is underlain by superficial deposits consisting of low permeability glacial till
deposits overlying bedrock consisting of coal measures which is classified by the
Environment Agency as a Secondary A (minor) aquifer.
Source Protection Zones
10.17
The site is not within a Source Protection Zone (SPZ) and there are no SPZ’s located within
1km of the site.
Groundwater Abstractions
10.18
There are no licensed groundwater abstraction points on site or within 1km of the site.
EIA2-V2-9069-JC-HL
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Hydrology
10.19
The nearest surface water feature (land drain) is recorded as issuing on site flowing from
south to north along the north site boundary and sinks offsite. There is a second surface
water feature that extends from approximately the middle of the eastern site boundary to
Rectory Farm, and flows west to east. Furthermore, two surface water features (ponds)
are approximately 20m and 150m south east of the site respectively. There are no River
Quality points within 500m of the site.
10.20
The nearest surface water abstraction point is located approximately 400m south east of
the site and relates to the abstraction of water from Bradley Brook for industrial purposes.
However, this licence is revoked. There are a further two surface water abstractions
located 6000m east of the site in Bradley Brook which are also revoked.
Contaminated Land
Potential Areas of Contamination
10.21
A Phase 1 Geo-Environmental Ground Investigation Report of the site was prepared by
Integra Consulting Engineers (see Volume 3: Technical Appendix 10.1). After appraisal of
the available historical information, the site appears to be greenfield with no significant
site uses other than rural land being recorded. Furthermore, although numerous off site
potential contaminative sources were recorded to the north they are not envisaged to
have posed or pose a significant detrimental influence to the site due to the presence of
the steep sloping topography associated with the dividing surface water course and
Barrowcroft Wood acting as a buffer between the sites.
Mineral Extraction / Mining
10.22
After appraising the acquired desk study information, it is anticipated that the risk posed
by ground instability issues relating to previous mining issues is moderate across the site
area. Geological investigation, utilising rotary holes should be undertaken across the site
to investigate the presence of potential ground instability issues relating to shallow mine
workings beneath the site within influencing distance of the proposed development.
Risk Assessment
10.23
On the basis that no potential historical or contaminative sources were identified at the
site, it is deemed that the site does not pose a risk to current or proposed site controlled
waters receptors. Consequently, no conceptual model has been deemed necessary and no
associated environmental intrusive works / chemical testing are therefore required.
EIA2-V2-9069-JC-HL
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Ground Gases
10.24
The Indicative Atlas of Radon in England and Wales produced by the Health Protection
Agency and British Geological Survey indicates that the site lies in an area where less than
1% of homes are above the action level. Furthermore, the BRE211 ‘Guidance on Protective
Measures for New Buildings’ indicates the site to be in an area where radon protection is
not required.
10.25
On the basis that no significant ground gas sources have been identified on or within
influencing distance of the site, and utilising the guidance stipulated in CIRIA 665 (2007)
and the CL:AIRE Research Bulletin 17 (2012), the probability and consequence of the
identified potential ground gas sources on the development is considered to result in a low
level of risk. Consequently, it is deemed that ground gas monitoring at the site is not
required.
10.26
It should be noted that there are no other recorded historic landfills, registered
contemporary landfills or registered waste treatment or disposal site within 250m of the
site. Furthermore, although potentially infilled streams were noted within 250m of the site,
this is not regarded as a potential ground gas source due to the insignificant volume of
infilled material utilised (if infilled).
10.27
If any previously unrecorded potential ground gas sources are recorded during the site
investigation works, for instance organic soils (peat) and / or infilled ground of potentially
ground gas producing materials, then appropriate ground gas monitoring will naturally be
undertaken.
Assessment of Impact and Significance
Introduction
10.28
For the purpose of the Environmental Statement, a suite of outline activities has been
identified in order that a robust environmental appraisal can be undertaken. These are:
(i)
Demolition and Site Clearance;
(ii)
Construction;
(iii) Post Construction Occupancy.
Demolition and Site Clearance
10.29
Activities are likely to include the redistribution of volumes of soils as part of cut and fill
operations across the site to achieve proposed finished floor levels and the removal of
selected trees, hedges and areas of scrub and vegetation.
Impact 1 – Excavation Works
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10.30
On site excavations during preparatory earthworks will expose soils susceptible to erosion
producing surface water runoff with a high content of suspended soils which in turn may
cause degradation in the quality of on site and off site surface waters. This may result in a
Moderate Adverse impact for the short-term.
Construction
10.31
The activity will involve the actual construction of the development and will include items
presented in the site masterplan.
Impact 2 – Impact on waste generation
10.32
The current development proposals indicate that the area will be utilised as a residential
estate with associated infrastructure. The proposals have the potential to generate large
volumes of soils from cut and fill operations in order to accommodate development
plateaux with associated retaining structures and engineered slopes. The majority of soils
that are excavated during the construction of footings, installation of services and the
construction of pavements are likely to be classified as inert and due to the large size of
the site, can be redistributed to different areas of the site. Accordingly, there would be no
perceived impacts.
Impact 3 - Impact on human health: construction workers
10.33
The investigation has not identified any potential significant contamination in shallow soils
across the site. Accordingly, there would be no perceived impacts are anticipated on
the health of construction workers.
Impact 4 – Impact on the groundwater regime
10.34
A perched water table is present at shallow depths in the superficial deposits. The
construction of foundations or the installation of services locally may affect the
hydrogeological flow system within the site and this may result in a Minor Adverse
impact.
Impact 5 – Impact on the groundwater quality
10.35
Excavations during preparatory earthworks may encounter and expose shallow and
perched groundwater resources to contamination from machinery and surface water
runoff which, in the absence of mitigation measures, could result in a Minor Adverse
impact.
Impact 6 – Impact on the ground gas regime
10.36
A negligible gas regime has been identified beneath the site. Accordingly, it is considered
there will be no impact to the development during construction.
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Post Construction Occupancy
10.37
This activity commences once post construction is completed and the proposed dwellings
are occupied
Impact 7 – Impact on human health: future end users
10.38
The investigation has not identified any potential significant contamination in shallow soils
across the site. Accordingly, there would be no perceived impacts are anticipated on
human health: future end users.
Impact 8 – Impact on the ground gas regime
10.39
As stated above, negligible gas regime has been identified beneath the site. Accordingly, it
is considered there will be no impact to the development post construction
10.40
These assessments are based on the information presented with the report and on the
basis that no unidentified contamination is recorded at the site.
Mitigation
Introduction
10.41
Mitigation measures should be implemented during and after construction to reduce
and/or eliminate potential adverse impacts.
Impacts During Demolition
Impact Management - Excavation Works
10.42
Assuming that demolition workers follow the recommendations of the geo-environmental
risk assessment and undertaken good engineering practice, there should be no
perceived impact to the surface water quality or human receptors.
Impacts During Construction
Impact 4 - Impact Management - Groundwater Regime
10.43
The groundwater flow and the depth of the water table should be considered in the design
of the foundations for the proposed development. However, the finished plateau levels of
the development are unlikely to significantly affect the hydrogeological regime and there
should be no perceived impact.
Impacts During Post Construction Occupancy
Impact 7 – Impact Management - Human Health: Future End Users
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10.44
Additional phased ground investigation works should be carried out to clarify the nature
and extent of any ground contamination at the site. This should identify the need for soil
and/or groundwater remediation if required.
10.45
Although minor adverse impacts are possible, as contamination is highly localised, it is
considered that, with appropriate remediation measures, there will be no perceived
impacts on the health of the future end users of the site.
Residual Effects
Residual Impacts during Demolition and / or Construction
10.46
There will be no residual impacts as a result of the proposed site development in respect
of the ground, groundwater and surface water conditions assuming that mitigation
measures identified above are implemented.
10.47
Based on an assessment of background information on the site, the following conclusions
can be drawn:
1)
The development area is underlain by a viable thickness of superficial deposits
of glacial till.
2)
The development area appears to be greenfield in nature, with no significant
site uses other than rural land being recorded. As a result there is a low
potential risk to human health and controlled waters at the development area.
3)
After appraising the acquired information, there is a moderate risk of ground
instability issues relating to previous mining issues across the development area.
10.48
The following recommendations are made:
1)
It is recommended that a staged ground investigation should be carried out
following receipt of the detailed proposed development layout to confirm the
ground conditions including the presence of any groundwater and facilitate
foundation design and any remediation measures which may be required – in
particular the detailed assessment of the risk posed by the underlying potential
mine workings.
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11.
CULTURAL HERITAGE AND ARCHAEOLOGY
Introduction
11.1
This chapter sets out an assessment of the potential effects of the proposed residential
development on land north of Rectory Lane, Standish, Wigan on cultural heritage assets.
It takes the form of a desk-based assessment of the outline application site and its
immediate vicinity, and draws on existing information in order to identify the resource in
terms of baseline conditions, and the resultant potential impacts of development. In this
way the significance of the impact is assessed and relevant recommendations can be
made for mitigation, if required.
11.2
The assessment has been carried out by Peter de Figueiredo Dip Arch MA RIBA IHBC,
Heritage Consultant. Thanks are due to Mark Gaskell of Lancashire Aviation & Military
Research for detailed information about the World War II Ministry of Supply Factory at
Standish, and to Lesley Dunkley of the Greater Manchester Archaeological Advisory
Service.
Technical Context
11.3
Archaeology can be described as the study of past human societies or people through
physical evidence of their material culture. In this assessment, the term refers to subsurface remains and artefacts and to surface features such as earthworks. Archaeological
evidence can be described as ‘in situ’, which means that it has not been significantly
disturbed or moved from its original place. Artefacts may also be in situ or they may be
described as ‘residual’. This means that they have been disturbed by later activity,
accidental or deliberate, and so are found in a context which they did not occupy when in
use.
11.4
Cultural Heritage encompasses archaeological resources in addition to other built
elements of heritage, such as historic buildings and structures, and other elements such as
field systems which form historic landscapes.
11.5
Historic Assets can be represented by a wide range of features, both extant and hidden,
that have been created by past human occupation and use of the landscape. They are a
non-renewable resource. The presence of heritage assets is a material consideration in
determining planning applications. Assessment of potential impact requires consideration
of the following matters:
·
Development can have an impact on heritage assets directly, such as through
the effects of construction on buried features, and indirectly, through such
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factors as changes to the ground-water regime or visual impacts on the setting
of neighbouring monuments.
·
Desk-based assessment and walk-over surveys involve the review of currently
available information. It is possible that further features exist at the site that are
invisible or not yet known. The potential for this may be assessed from ground
conditions, features within the wider area and a history of land use in the
proposed development area.
11.6
This assessment has been informed by current best practice and by a range of national
and local planning policy and guidance documents. The importance of cultural heritage
remains is recognised in legislation and in national and local policy.
Legislation
11.7
The principal legislation in force in England is:
·
The Ancient Monuments and Archaeological Areas Act 1983 and 2002. This gives
provision for a schedule of monuments which are protected. By legal definition,
these Scheduled Monuments are considered as being of national importance.
·
The Planning (Listed Buildings and Conservation Areas) Act 1990 provides for
the definition and protection of listed buildings and conservation areas. Listed
buildings are recognised as being of special architectural or historic interest.
·
Other legislation that may have an effect on the treatment of heritage assets
includes the Town and Country Planning Act 1990, and the Treasure Act 1996.
The effects of the Localism Act 2012 may also be relevant in some cases,
though the likely impact of this legislation remains uncertain.
National Policy
11.8
National policy is set out in the National Planning Policy Framework (NPPF), published by
the Department for Communities and Local Government in March 2012 as a replacement
for Planning Policy Statement 5: Planning for the Historic Environment and the majority of
other Planning Policy Statements and Guidance Notes. The NPPF requires local planning
authorities to identify and assess the significance of heritage assets that may be affected
by development. One of the core principles of the document is that ‘Planning
should...conserve heritage assets in a manner appropriate to their significance, so that
they can be enjoyed for their contribution to the quality of life of this and future
generations. Definitions of ‘historic environment’, ‘archaeological interest’, ‘heritage asset’,
and ‘designated heritage asset’ are set out in the NPPF.
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11.9
In addition, the Historic Environment Planning Practice Guide, which accompanied PPS5,
remains in place as national guidance until it is replaced, though it should be read in the
light of the NPPF, and does not comprise policy.
11.10
The English Heritage guide Conservation Principles: policies and Guidance for the
Sustainable Management of the Historic Environment has been used as a template for
parts of this assessment.
Local Policy
11.11
The proposed development area is included in the Metropolitan Borough of Wigan. Local
guidance and policy is provided through the Wigan Core Strategy which was adopted in
September 2013.
11.12
The Wigan Core Strategy Policy CP11 is relevant to the proposed scheme, as follows:
Policy CP 11: Historic Environment
We will protect and enhance our historic environment thereby helping to make the
borough a better place to live, visit and work in by:
1.
Conserving, protecting and enhancing our heritage assets, including scheduled
ancient monuments, listed buildings and their settings, conservation areas,
historic parks and gardens, in accordance with legislation and national planning
policy and our locally listed buildings and structures, key historic landscape
characteristics and other important features as appropriate.
2.
Encouraging the sympathetic and appropriate re-use of existing buildings and
structures, especially those which make a positive contribution to the special
character of their locality and are identified as ‘at risk’.
3.
Promoting the value of our historic environment through signing, interpretation,
public art and other measures as appropriate.
Data Gathering and Survey Work
11.13
The study comprised a review of pertinent cartographic and other historical sources, and
Historic Environment Record (HER) entries. A site walk-over survey and a detailed
examination of existing buildings were also carried out.
Proposed Scope of Assessment
11.14
This assessment covers the entirety of the application site and other land in the applicant’s
ownership, together with additional features within the vicinity. Consideration is given to
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the potential cumulative impact with other currently proposed development sites off
Rectory Lane (Planning Application No A/13177831 – Rectory Fields at Standish).
11.15
The EIA regulations stipulate that an ES should, where possible, identify, describe and
assess the likely significant effects of the development on the environment. The
methodology sets out three stages to identify the significant effects:
11.16
·
Receptors
·
Environmental Impacts
·
Significant Effects
The Scoping Opinion of Wigan Borough Council pursuant to Regulation 13 of the Town
and Country Planning (Environmental Impact Assessment) Regulations 2011 requested
that the assessment should cover ‘Historic Environment and Archaeology including those
sites identified at Rectory Farmhouse and Bradley Hall Public House as well as St Wilfrid’s
Church and Worthington Hall’.
Potential Receptors
Table 11.1: Relative Sensitivity of Different Receptors
Sensitivity
Very High
High
Medium
Low
Examples of Receptors
World Heritage Sites, Grade I and II* Listed
Buildings, Scheduled Ancient Monuments
Grade II Listed Buildings Conservation Areas,
sites of national importance
Sites of Regional/County importance
Sites a local interest, Sites with a low local
value or interest for education or cultural
appreciation, Sites that are so badly damaged
that too little remains to justify inclusion into a
higher grade.
Designated Features
11.17
The significance of an effect is relative to the sensitivity or quantity of a receptor.
Receptors are set out in accordance with the magnitude of their importance. Some
receptors are given relatively high levels of importance through legislation, such as
designated heritage assets. Determining the importance of other receptors can be more
subjective. The environmental statement assesses each one in relation to the hierarchy
shown in Table 11.1 above.
11.18
There are no scheduled monuments within or in the immediate vicinity of the study area.
11.19
There are four listed buildings within the wider area. St Wilfrid’s Church is a Grade I listed
building ½ mile to the west of the application site; Worthington Hall is a Grade II* listed
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building ½ mile to the south east of the site; Bradley Hall, a Grade II* listed building, is
located on Bradley Hall Trading Estate; Rectory Farm, a Grade II listed building, is just
north of Rectory Lane adjacent to the application site. None of the buildings is within the
applicant’s ownership.
Other Heritage Features
11.20
Douglas Mill is a former cotton spinning mill fronting Bradley Lane, dating from the late
19th century. There are a number of structures associated with the World War II Ministry
of Supply Factory, including pill boxes, police posts and a complex of magazines, the latter
contained by embankments within excavated ground and served by an open drainage
system.
Historic Environment Record (HER)
11.21
Four entries are included on the Greater Manchester HER: Bradley Hall, Rectory
Farmhouse, Douglas Mill and the Munitions Compound. These have been confirmed on site
and are identified as heritage assets below.
Magnitude of Impact
11.22
The magnitude of an impact is the degree of the effect of the development on the
heritage asset.
It can be defined as substantial, moderate, slight, or negligible.
Magnitude of impact is ranked without regard to the value of the asset, as summarised in
Table 11.2. Environmental impacts can be beneficial and adverse; short, medium or longterm; direct or indirect; permanent or temporary; and cumulative.
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Table 11.2: Criteria used to Determine Magnitude of Impact
Magnitude of Impact
Description
Significant change in surrounding environment;
Complete destruction of the site or feature.
Change to the site or feature resulting in a
fundamental change in ability to understand
and appreciate the heritage asset and its
cultural heritage value/historical context and
setting.
Significant change in environmental factors;
Change to the site or feature resulting in an
appreciable change in ability to understand and
appreciate the resource and its cultural
heritage value/historical context and setting.
Change to the site or feature resulting in a
small change in our ability to understand and
appreciate the heritage asset and its cultural
heritage value/historical setting.
Negligible change or no material change to the
site or feature. No real change in our ability to
understand and appreciate the heritage asset
and its cultural heritage value/historical context
and setting.
Substantial
Moderate
Slight
Negligible
Significance of Impact
11.23
The significance of impact is assessed by combining the relative magnitude of impact
(Table 11.2) with the relative sensitivity of a particular receptor (Table 11.1). A matrix is
used of the criteria defined in Tables 11.1 and 11.2 to calculate the significance of the
impact and this is shown in Table 11.3.
11.24
Impacts have been identified as those that would potentially lead to a change to the
receptor or site significantly outside the existing range of baseline conditions.
Table 11.3: Impact Significance Matrix
Magnitude of Impact
Sensitivity
Substantial
Moderate
Slight
Negligible
Very
High
Major
Major –
Intermediate
Intermediate
Minor
High
Majorintermediate
Intermediate
Intermediate
-minor
Neutral
Medium
Intermediate
Intermediate
– Minor
Minor
Neutral
Low
Intermediate
- Minor
Minor
Minor Neutral
Neutral
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Residual Impacts
11.25
The impact significance category for each receptor is described and assessed, and
recommended mitigation measures are identified for impacts that are of intermediate
significance or above. The residual impact assessment takes into consideration the ability
of mitigation to reduce or offset the impact.
Baseline Conditions
Historical Background
11.26
Standish is not mentioned in the Domesday Book, and thus probably developed after the
Norman Conquest. A number of moated manors were created in the area during the
medieval period. The first reference to Bradley Hall is from 1298, when the manor was
granted to Hugh de Haydrock. In 1471 it was held by Christopher, son and heir of James
Standish. By 1517 it belonged to Thomas Standish of Duxbury, whose mother Alice
occupied it. Alexander Standish left it to his son Thomas in 1662. In 1664 a hearth tax was
paid on eight hearths, Bradley Hall being second only to Standish Hall in importance within
the locality.
11.27
In the mid 17th century, it was sold to Hugh Warren, a Chorley philanthropist, who
bequeathed it to his nephew, also Hugh Warren, in 1682. In 1763 it was held by Revd.
Allanson, and in 1779 by Sir Richard Clayton of Adlington. At that time the estate
consisted of ‘40 large acres and 40 acres of woods’.
11.28
In 1813 the estate was in the possession of William Fisher and his son Richard was
recorded as living there in 1872. Benjamin Fisher was the owner in 1891, when it was sold
to Revd. CWN Hutton, rector of Standish. In 1897 it was leased to the Appleton family. In
1927 two coats of arms were recorded in the landing window of the Hall, possibly brought
in from elsewhere. One, dated 1711, showed the arms of Gerard de Bryn; the other a
quartered coat of the Stanleys. The Warrens were allied to the Stanleys. These items are
no longer in the building.
11.29
During the 19th century, the area was developed for coal mining. This was given impetus
by the construction of the railway which ran along the eastern boundary of the estate.
This was formed originally for the Preston and Wigan Railway, which opened in 1838 with
a station at Standish, and later became the property of the London and North Western
Railway. It now forms the western mail line.
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Figure 11.1 Bradley Hall and estate 1908
11.30
In 1847, the Fisher family of Bradley Hall sank two shafts to create the Bradley Hall
Colliery just west of the railway line. This operated until 1891, when it was closed and a
cotton mill was erected by the Bradley Manufacturing Co. just to the north. The mill was
later taken over by Douglas Mills Ltd, but closed in the 1930s. The Broomfield and
Langtree Pits just west of Bradley Hall were served by a mineral railway from the Bradley
Hall Colliery. Broomfield was opened in 1850, and was owned by Richard Fisher of Bradley
Hall at one stage. The Langtree Pit was sunk in 1857, and in 1865 both were acquired by
the Wigan Coal and Iron Co., surviving until 1932, when the mineral railway was taken up.
11.31
In December 1939, as part of the War Emergency Plans, Bradley Hall and estate totalling
approximately 147 acres, including Douglas Mill, a farm, a house, colliery remains and a
bakery were compulsorily purchased by the Ministry of Supply for use as a munitions
factory. The factory was to produce small arms ammunition, at an estimated cost of £1.1
million excluding land and buildings. The cost was shared by the Ministry of Supply, Royal
Air Force and Royal Navy. The factory was operated on behalf of the Ministry of Supply by
Imperial Chemical Industries - Metals Ltd. (ICI), and was known as SAAF2. Initial
production was 2.53 million rounds of small arms ammunition per week.
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11.32
The Ministry of Supply initially established the factory within Douglas Mill, but later
expanded into the old Bradley Hall Colliery and the area between the Hall and the colliery.
A complex of magazines was established in Barrowcroft Wood and a proof test firing range
was set up on the opposite side of Bradley Lane, the whole site being surrounded by a
high perimeter fence guarded by pill boxes and police posts, some of which remain. The
factory had its own Air Raid Precautions Units and Home Guard Unit.
11.33
The site was split into seven main areas, each having support buildings or areas, and each
producing different types of small arms ammunition. The first rounds with the head stamp
K2 (ICI Kynoch Factory No. 2) were produced in October 1940. Throughout the war, the
factory operated 24 hours a day, seven days a week. Workers would arrive on foot, bicycle
or special bus, some also coming by train to Standish Station from whence they would
enter the site through a special gate at the south east corner of the site.
11.34
On the night of 12/13 October 1941, two high explosive bombs fell close to the factory
with no injuries or damage caused, other than breakage of windows. In 1942 ICI was
unable to fulfil its labour requirements locally, due to increased production, and applied
urgently to the Northern Ireland Government for women workers. It was stressed that
‘care would be taken to ensure that they were given comfortable homes and their welfare
properly studied’.
11.35
On 1 October 1945 the number of employees stood at 1094, but with the cease of
hostilities, it fell to 230 by December of the same year. Those employees kept on were
involved in the breakdown of ammunition, until the closure of the factory in March 1946.
Following de-commissioning, the estate was leased to HJ Heinz Co. for manufacture of
food products. Certain sheds were retained by the Ministry for a number of years for
storage of war time machinery and equipment, as an essential part of the Government’s
Strategic Reserve, in case they would be needed again. Heinz opened the Standish
Canning Factory on the site in 1948, but moved in the 1980s to new factory premises at
Kit Green, Wigan. In April 1946 Carrington and Dewhurst set up weaving sheds in Bradley
Mill with 760 machines, but all textile operations ceased in the 1990s. The estate was
acquired by the Ainscough family in the 1980s, since when the buildings have been leased
as light industrial and business premises.
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Figure 11.2 Bradley Hall Trading Estate 1946 with Hall marked by arrow and Rectory Farm
with a star
11.36
During the war, Bradley Hall was used as a guest house and residence of the Site
Commandant, Major Healey. Left to deteriorate in the post-war period, the building was in
need of substantial refurbishment when the estate was purchased by the Ainscough
family. Converted for pub/restaurant use, it was sold on to Tetleys in 1984, but after initial
success, custom declined, and the building was sold back to the Ainscoughs in the early
1990s. It was converted as offices for Ainscough Crane Hire Limited in 1992. In recent
years a number of temporary cabins have been added at the rear of the building providing
additional office accommodation for the expanding crane hire business.
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Assessment of Significance and Impact
Sensitivity of Heritage Assets
11.37
Using the criteria in Table 11.1, each of the heritage assets identified in the gazetteer
below has been assessed for its sensitivity. Levels of sensitivity have been assessed in
accordance with policies and guidance in the NPPF and the Historic Environment Planning
Practice Guide, as well as the English Heritage Conservation Principles: Policies and
Guidance for the Sustainable Management of the Historic Environment.
Gazetteer of Receptors (Heritage Asset Sites)
Site No
01
Site Name
Bradley Hall
NGR
SD 5204 1101
Site Type
Country House, now offices
Period
C15/16, refaced and extended C19
HER No
12031.1.0
Statutory Designation
Listed GII*
Description
As seen from the exterior, the building has the character
th
of a mid-19 century villa, clad in brick, with a stone plinth and quoins, and with gables on
three sides. The Victorian character was created for the Fisher family, who owned the Hall
during the 19th century. The gables have Gothic decorative bargeboards, and the windows
are mullioned with cusped lights. Closer examination of the brickwork confirms differing
periods of construction. The north facing, front elevation is built in a Garden Wall bond,
and possibly dates from the 18th century. The west and south elevations are in stretcher
bond, and were largely rebuilt as part of the 1980s refurbishment, after the Hall had fallen
into a poor state of repair. The south west gable is an addition made at this time, and
replaced a conservatory and outriggers. The reproduction of joinery, re-used masonry, and
others details of the extension are unusually convincing. The roof is of slate but the
chimney stacks have been truncated.
Inside the building, a completely different character is revealed: that of a timber-framed
south Lancashire manor house. The entrance porch leads into the original screens
passage, with the hall to the right, and former service wing to the left. The solar wing,
which would have been situated beyond the hall, no longer exists. A number of different
phases in the construction of the house can be understood from an analysis of the timber
frame. The frame enclosing the screens passage and the hall is probably of the late 15th
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century, built for Christopher Standish or his father James. A floor on heavy moulded
beams was inserted within the hall in the late 16th century, again for the Standish family,
creating a large chamber above. At the same time a stair tower was added at the end of
the screens passage, though the present staircase within it is 19th century. Also from the
late 16th century is the parlour extension on the north side of the hall. To the left of the
screens passage is a separate frame from c.1600, including an ogee-arched doorway
leading into it. It has five bays and extends to the rear in a manner that suggests a
courtyard plan. An earlier, probably late 15th century frame constructed of massive ovolo
moulded beams and wall posts, carved with capitals, is revealed within the service wing
(though this differs in style from the hall frame, and is a mark of a high status building).
On the upper floor, the roof structure is open to view, again showing different periods of
construction. Post and truss cross frames with wall plates, heavy principal rafters, and
trenched purlins are seen throughout. Some of the trusses have diagonal braces, and
some have curved braces. Wind braces are also visible. Whilst the majority of the framing
is original and retains its integrity, the restoration carried out in 1980 involved replacement
and repair of defective timbers, and stripping out of much of the Victorian and later infill to
reveal the structural frame.
The repair and opening up of the frame was carried out when the Hall was converted to a
pub/restaurant, so as to create larger space that could be easy supervised. The conversion
to offices in the 1990s involved the introduction of partitions to provide a more cellular
arrangement and to form protected fire escape routes.
The building was sensitively restored and extended in 1980 and has been well-maintained
since that time. As a result it is in generally good condition. The loss of the chimney
stacks, which were an essential feature of the mid-19th century re-modelling of the
exterior, is regrettable, and has harmed its appearance. In recent years, the use of the
building by a busy and successful company has led to provision of temporary structures at
the rear, which are inefficient and unsightly.
Assessment
Very high significance
Site No
02
Site Name
Rectory Farmhouse
NGR
SD 5735 1045
Site Type
House
Period
C18 with C19 addition
HER No
7536.1.0
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Listed GII
Description
Situated on the north side of Rectory Lane, it is a mid 19th
century farmhouse with a 19th century addition. The original part, which is built of brick
with a stone base and slate roof, is of symmetrical design, with three bays and two
storeys. The brick string course is dropped over the entrance. All windows have late 19th
or early 20th century casements. The left hand bay is a 19th century extension in roughly
matching style. The 19th/20th century farm buildings to the side and rear are unlisted.
There is a low stone boundary wall to Rectory Lane.
Assessment
High significance
Site No
03
Site Name
Douglas Mill
NGR
SD 5724 1117
Site Type
Cotton mill, now light industrial
Period
Late C19
HER No
4800.1.0
None
Description
Three storey brick cotton mill with flat roof and tower at
north-west corner. The tower originally had a slated pyramid roof with dormers, but this
was removed when it was converted to a munitions factory. The engine house is attached
to the north east end of the mill, and the chimney, now truncated, is attached to a boiler
house. A single storey weaving shed to north is early 20th century. A WWII fire-watchers
post was added at roof level to the south west corner of the mill.
Assessment
Low significance
Site No
04
Site Name
WWII Munitions Compound
NGR
SD 5710 1060
Site Type
WWII
Period
World War II Military Supply Complex
HER No
7535.1.0
None
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Description
The Historic Environment Record refers solely to the
ammunitions storage compound, and the perimeter fence surrounding the factory. This
gazetteer refers to the main features of interest within the complex as a whole, as follows:
Three Pill Boxes survive along the perimeter of the former munitions site. Originally there
were eight, but five have been demolished. Of the three that remain, two are on the
southern boundary – one is close to Rectory Road, immediately west of Rectory
Farmhouse, and the other to the right of Rectory Farmhouse – and the third is on the
eastern boundary, close to the railway line. Each is of identical design, with in-situ
concrete walls, a concrete slab roof and high level horizontal slit openings. Inside are
concrete benches along two of the walls. The cost was £127 for each pill box. They would
have been manned by the Factory Home Guard Unit to guard against military attack.
A Police Guard Post is situated at the south east corner of the Ministry of Supply site
where a footpath along the edge of the railway line provided a means of access for
employees arriving by train at Standish Station. It is a small brick shelter with pitched slate
covered roof and a single door and window.
A complex of eight Magazines for storage of explosives is situated within Barrowcroft
Wood. They were built for the storage of explosive compounds before they were inserted
into cartridges and other small arm munitions manufactured within the factory. There are
three 20 ton magazines, and four 10 ton magazines, each built at a cost of £751. An
additional smaller one was added after 1942. The magazines are rectangular brick
structures with flat asphalt-covered concrete slab roofs supported on reinforced concrete
beams. The smaller buildings have a single entrance through a lobby at one end, and the
larger buildings have entrances at both ends. Each of the magazines is set within an
excavated enclosure with natural sloped embankments to give protection in case of
explosion. A network of concrete driveways, originally laid with small gauge rail tracks,
linked the complex of magazines with the assembly complex to the north. Open drainage
channels run in the centre of the driveways, carrying surface water to the nearby brook.
All eight magazines within the complex survive, but they are in varying states of repair and
authenticity. One is suffering from severe settlement, another has suffered partial
demolition of external walls, and most have problems of corrosion to steel reinforcement
bars in the roof slab and concrete beams due to failure of the asphalt roof coverings. The
drainage system is blocked in many places, which has resulted in minor flooding of sunken
areas and rising damp.
Assessment
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Low/medium significance
January 2014
168
Site No
05
Site Name
St Wilfrid’s Church, Market Place, Standish
NGR
SD 5627 1028
Site Type
Church
Period
C16 with C19 and C20 additions
HER No
Listed GI
Description
Situated on Market Place, half a mile from the application
site, this is one of the most interesting churches in Lancashire. It is first mentioned in
1205, but the foundation of the large parish, which included 11 townships, is likely to be
earlier. The present church dates from 1582-89. Lawrence Shipway was the master
mason. The exterior is Perpendicular Gothic. The interior is more remarkable, for it
incorporates arcades of Tuscan columns on high pedestals, which are dated 1584 but are
more characteristic of the mid 17th century in the north of England. This exceptionally
early use of classical orders is thought to derive from the association of the patron,
Edward Standish, with the 4th Earl of Derby, and the latter’s friendship with Robert Dudley,
Earl of Leicester, whose unfinished church at Denbigh, 1578, was the first building in
Britain to make use of the Tuscan order.
The spire was added in 1872, and the church was restored by Austin and Paley in 191314, who added the vestries at the same time, and then in 1926 built the gatehouse. The
church contains a fine set of monuments and other furnishings.
Assessment
Site No
06
Site Name
Worthington Hall, Chorley Road, Wigan
NGR
SD 5793 1026
Site Type
House
Period
C16 with C18, C19 and C20 additions
HER No
Listed GII*
Description
Situated on Chorley Road, half a mile south west of the
application site, this is a fragment of a once larger house dated 1577 on a lintel, with the
inscription EO EDWARDE WOTHINGTON. It is of 4 bays, with elaborate timber framing
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surviving only in the entrance bay. The first floor is jettied out on a carved bressumer. The
eastern bay of stone is C1700. The western bay was rebuilt in brick in the 20th century.
Assessment
Figure 11.3 Plan of Trading Estate and surrounding land showing location of Hall, Douglas
Mill, Rectory Farm and magazine compound marked by arrows
Assessment of Effects
01 - Bradley Hall
11.38
At present Bradley Hall cannot be seen from outside the immediate grounds, it has poor
access, and is blighted by the proximity of low grade industrial buildings. The regeneration
proposals for the ‘land at Bradley Hall Trading Estate, Standish, Wigan’ (Application
A/13/77974) involve a number of measures that will restore the Hall as the focus of the
estate.
11.39
The site chosen to build the Hall over 800 years ago is on an eminence which would have
commanded extensive views over the surrounding countryside. After the construction of
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the munitions factory in the mid 20th century, the setting suffered, and a dense screen of
trees was allowed to grow up around the Hall in order to close off the views. Whilst the
trees now form a significant visual amenity within the wider area, they sever the historic
relationship between the Hall and the surrounding landscape.
11.40
The illustrative layout for application A/13/77974 treats Bradley Hall as a landmark, and
creates a series of visual connections both within the development site and the wider area.
Most of the tree stock around the Hall is self-sown, and with selective thinning and
management it is possible to allow for views of the Hall from a number of principal axes.
One of these is on the line of the original driveway and the access and landscape scheme
has been based on a landscape and visual appraisal of the site and considered within the
masterplan context.
11.41
The site covered by the subject application is located further away from Bradley Hall, and
because of existing natural features such as land form and woodland, it is unlikely that the
proposed residential development will be visible from the Hall. As a result the impact of
the application proposals on the setting of Bradley Hall will be neutral.
11.42
The cumulative effect of both this proposal and application A/13/77974, however, will be
positive, as a result of enhancing the setting of the Grade II* listed building and better
revealing its significance. When considering the cumulative impact of the proposed
Rectory Fields development by Morris Homes and Persimmon Homes, the effect will still be
substantially positive.
02 - Rectory Farmhouse
11.43
Rectory Farmhouse is situated on the north side of Rectory Lane, with open land to the
north, east and west, which is included in the proposed development site. The farm
complex consists of the listed farmhouse, and two brick agricultural buildings, which
although unlisted, form part of the historic setting. The buildings stand in a substantial
area of land. This is bounded by hedging and trees, which form a good visual barrier.
Immediately east of the farmhouse is a group of mature trees, partly within the curtilage
of the farmhouse, and partly within the development site. These form an important aspect
of the setting of the listed building, and should be retained, together with the creation of
an appropriate landscape buffer and new tree planting to protect and enhance the existing
setting, and mitigate any harmful impact at a point where development is at its closest.
11.44
Without the protection of the existing tree cover and without a landscape buffer, there is
the potential for intermediate/minor adverse impact on the setting of the designated
heritage asset. With the proposed mitigation in the form of protection of existing tree
cover, creation of an acceptable buffer zone and enhanced planting along the eastern
boundary of Rectory Farmhouse, the impact of the proposal will be minor adverse/neutral.
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171
11.45 The proposed Rectory Fields development by Morris Homes and Persimmon Homes is
situated to the south of Rectory Lane. A belt of existing trees on the south side of Rectory
Lane separates the Rectory Fields development from Rectory Farmhouse which is
proposed to be strengthened by new tree planting. As a result the cumulative impact of
development both north and south of Rectory Lane after mitigation will be minor
adverse/neutral.
03 - Douglas Mill
11.46
The significance of Douglas Mill is substantially diminished by the alterations it has
suffered and the poor quality of the surrounding development. The current application will
have a neutral effect since the mill is screened from the development site by existing 20th
century buildings and woodland. The cumulative impact of development in accordance
with application A/13/77974, however, will have a slight positive impact on the overall
setting of the mill.
04 - WII Munitions Compound
11.47
The three surviving Pill Boxes are situated on the south and east boundaries of the Bradley
Hall Trading Estate. They are small structures one of which is within the proposed
development site. It is proposed to retain the structure within areas of public open space,
together with appropriate interpretation. The impact on these buildings will be neutral.
11.48
The Police Guard Post is situated outside the site to the south east, and like the pill boxes,
is a small building which will be unaffected by the development proposals. The impact on
the building will be neutral.
11.49
The magazines are situated within Barrowcroft Wood, which is outside the development
area, and which is proposed to be retained as amenity woodland. The magazines are
sunken within the terrain, and are not visible from the surrounding areas. The impact on
these structures will be neutral.
11.50
The cumulative impact including the Rectory Fields proposals will also be neutral.
05 – St Wilfrid’s Church
11.51
The church is situated half a mile away, and is separated from the site by a band of postwar housing. It cannot be seen from the site, with which it has no visual or spatial
relationship.
11.52
The impact of development will therefore be neutral.
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172
06 – Worthington Hall
11.54
Worthington Hall is separated from the site by the electrified railway line, by a woodland
belt and by an area of post-war housing. It cannot be seen from the site, with which it has
no visual or spatial relationships.
11.55
The impact of development will therefore be neutral.
Mitigation
11.56
Development in the vicinity of Bradley Hall, which is within the scope of application
A/13/77974 in respect of land at Bradley Hall Trading Estate, will be designed to mitigate
any adverse effects on the heritage asset. There will be a buffer of managed open space
surrounding the eminence on which the Hall is situated, with a perimeter pedestrian route.
This will link with a network of other open spaces providing access throughout the
residential development and on to Standish town centre.
11.57
Protection of existing trees, maintenance of a landscape buffer, and new planting to the
east of Rectory Farmhouse will safeguard the setting of the Grade II listed building as
described in 11.42 and 11.43 above.
11.58
A programme of recording of the Ministry of Supply Factory buildings in their present state
will be undertaken before any demolition takes place within the scope of application
A/13/77974. Where buildings are being retained, such as the magazines, consideration will
be given to finding suitable an alternative use, and to the development of an interpretative
strategy to recount the history of the site and its contribution to the national war effort.
11.59
The archaeological potential of the site is low, and the extent of ground disturbance for
construction of the munitions factory reduces the chance of recovering any finds. No
archaeological interventions have taken place within the development area, but an
archaeological watching brief may be appropriate in limited areas where there is any
uncertainty.
11.60
There is a medium certainty of effectiveness of mitigation measures based on available
information, although data may require review of the measures over time.
Residual Effects
11.61
Following implementation of the mitigation measures, the proposed development would
not result in any significant adverse effects on heritage assets or features.
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173
11.62
The study has identified four heritage assets in the vicinity of the development site. There
will be no potential direct impacts on any of these assets. The setting of Bradley Hall,
which is Grade II* listed building, will be unaffected by the proposed development. The
setting of St Wilfrid’s Church and Worthington Hall will also be unaffected. The potential
effect on the setting of the Grade II listed Rectory Farmhouse will be intermediate/minor
adverse. Provided that mitigation is introduced in the form of protection of existing trees,
creation of a landscape buffer and new tree planting, the impact on Rectory Farmhouse
will be reduced to minor adverse/neutral. The impact on the undesignated heritage assets
will be neutral.
11.63
The Impact Assessment has demonstrated that there will be no significant harmful effects
on cultural heritage, following the implementation of appropriate mitigation measures.
Table 11.4: Summary of Impact Significance
Site
Heritage
Asset
Identified
Impact
No change in
setting.
Cumulative
impact with
Application 1
will
be
beneficial
Sensitivity
Magnitude of
Sensitivity
Significance
of impact
before
mitigation
Significance
of Impact
after
mitigation
Very
High
Neutral
Neutral
Neutral
No change in
setting
High
Moderate/
slight
Intermediate
/minor
adverse
Minor
adverse/
neutral
No change in
setting
Low
Neutral
Neutral
Neutral
04
WWII
Munitions
Compound
No change in
setting
Medium/
Low
Neutral
Neutral
Neutral
05
St Wilfrid’s
Church
No change in
setting
Very
High
Neutral
Neutral
Neutral
06
Worthingto
n Hall
No change in
setting
Very
High
Neutral
Neutral
Neutral
01
Bradley
Hall
02
Rectory
Farmhouse
03
Douglas
Mill
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Bibliography and Sources
Written Sources
Beckmann, A, Wigan: A Landscape Character Assessment, 2009
Greater Manchester Archaeological Unit, Langtree Valley Golf and Country Club, Standish:
An Archaeological Assessment Report No 1991/17, 1991
Greater Manchester Archaeological Unit, Standish Golf Course: An Archaeological
Assessment Report No 1993/23, 1993
G Miller, Historic Houses in Lancashire: The Douglas Valley 1300-1770, 2002
TC Porteous, A History of the Parish of Standish, 1927
Victoria County History, A History of the County of Lancashire, Volume VI, 1911
Web Based Sources
British History On Line ("http://www.british-histry.ac.uk")
Greater Manchester Historic Environment Record
("http://www.gmau.manchester.ac.uk/her/index.htm)
English Heritage Images ("http://www.englishheritageprints.com")
Images of England ("http://www.imagesofengland.org.uk")
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12.
NOISE AND VIBRATION
Introduction
12.1
This Chapter of the ES assesses the noise and vibration impacts of the proposed
development. It considers the potential impacts generated by the earthworks, construction
phase and operational phase of the proposed development.
12.2
The chapter describes the methods used to assess the baseline conditions currently
existing at the site and surroundings; the potential impacts of the development arising
from construction activities and additional traffic movements to and from the site at
existing noise sensitive locations; the impact of existing noise sources on sensitive areas of
the proposed development, the mitigation measures required to prevent or reduce the
impacts, and the residual impacts.
Noise from Earthworks and Construction Phase Activities
12.3
The activities associated with the earthworks and construction phase of the proposed
development will have the potential to generate noise and create an impact on the
surrounding area.
12.4
Guidance on the prediction and assessment of noise from development sites is given in
British Standard 5228 -1:2009 “Code of Practice for noise and vibration control on
construction and open sites – Part 1: Noise” (BS5228-1).
12.5
Construction noise can have disturbing effects on the surrounding neighbourhood. The
effects are varied and are complicated further by the nature of the site works, which will
be characterised by noise sources which will change location throughout the construction
period. The duration of site operations is also an important consideration. Higher noise
levels may be acceptable if it is known that the levels will occur for a limited period.
12.6
The sensitive receptors most likely to be affected by noise generated by the earthworks
and construction phase works of the development are detailed in Table 12.1.
12.7
Local authorities may also have their own procedures for control of construction activities
that are proposed in their catchment area. Wigan Metropolitan Borough Council (WMBC)
recommends that, for demolition sites, the contractor must employ best practicable means
as defined in the Control of Pollution Act 1974 (COPA 1974) to minimise noise and
vibration resulting from operations and shall have regard to BS 5228-1. Under the Control
of Pollution Act 1974, Section 61, the person intending to carry out the demolition works
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may apply in advance for Consent as to methods by which the works are to be carried out.
WMBC does not specify any noise limits.
12.8
WMBC provides the following examples of best practicable means:
·
“Work programmed to minimise noise at unreasonable hours.
·
Noisy plant and equipment shall be sited as far as possible from noise sensitive
buildings; use of barriers e.g. soil mounds, site huts, acoustic partitions etc. to
deflect noise away from noise sensitive buildings shall be employed wherever
possible.
·
Quiet types of plant, vehicles and equipment shall be used where practicable;
plant, vehicles and equipment shall where possible be fitted with silencers,
acoustic hoods or covers which should be kept in good order and used at all
times.
·
Plant, vehicles or equipment used intermittently should be shut down or
throttled down to a minimum when not in use.
·
Care should be taken when loading or unloading vehicles, dismantling
scaffolding etc to minimise impact noise.
·
Access to the site should be so sited to minimise disturbance to persons in noise
sensitive buildings by vehicles entering or leaving the site.
·
Any pneumatically operated percussive tools shall be fitted with approved
mufflers or silencers, which shall be kept in good repair.
·
To maintain good public relations and minimise the noise impact on residents
living in the vicinity of the site, notification should be given of the proposed
works.”
12.9
The Control of Pollution Act 1974 (COPA 1974) gives the local authority power to serve a
notice under Section 60 imposing requirements as to the way in which works are to be
carried out. This could specify times of operation, maximum levels of noise which should
be emitted and the type of plant which should or should not be used.
Section 61 -
enables anyone who intends to carry out works to apply to the local authority for consent.
Under Section 61 the local authorities and those responsible for construction work have an
opportunity to settle any problems, relating to the potential noise, before work starts.
12.10
In addition to COPA 1974, WMBC refer to BS5228-1. BS5228-1 provides guidance on
significance criteria for assessing the potential noise impacts associated with the
construction phase of large projects. For the purposes of this noise assessment, the noise
likely to be generated by the earthworks and construction phase has been assessed
against significance criteria established using the BS5228-1 ABC Method.
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Vibration from Earthworks and Construction Phase Activities
12.11
Work involving heavy plant on an open site is likely to generate vibration, which may, in
certain circumstances, propagate beyond the boundary of the site. In situations where
particularly heavy plant, vibrating compaction equipment or piling rigs are being used
close to the site boundary, nearby properties may experience ground-borne vibration.
12.12
Guidance on the assessment of vibration from development sites is given in British
Standard 5228-2:2009 “Code of Practice for noise and vibration control on construction
and open sites – Part 2: Vibration” (BS5228-2).
12.13
The sensitive receptors most likely to be affected by vibration generated by the
earthworks and construction phase works of the development are detailed in Table 12.1.
12.14
It is not possible to mitigate vibration emissions from an open site.
It is important
therefore to examine the proposed working method to ascertain what, if any, operations
would be likely to cause unacceptable levels of vibration at nearby sensitive locations. It is
possible that these operations could be modified to reduce their vibration impacts.
12.15
BS5228-2 2009 indicates that vibration can have disturbing effects on the surrounding
neighbourhood; especially where particularly sensitive operations may be taking place.
The significance of vibration levels which may be experienced adjacent to a site is
dependent upon the nature of the source.
12.16
Human perception of vibration is extremely sensitive. People can detect and be annoyed
by vibration before there is any risk of structural damage. Cases where damage to a
building has been attributed to the effects of vibration alone are extremely rare; even
when vibration has been considered to be intolerable by the occupants.
12.17
It is not possible to establish exact vibration damage thresholds that may be applied in all
situations. The likelihood of vibration induced damage or nuisance will depend upon the
nature of the source, the characteristics of the intervening solid and drift geology and the
response pattern of the structures around the site.
Most of these variables are too
complex to quantify accurately and thresholds of damage, or nuisance, are therefore
conservative estimates based on knowledge of engineering.
12.18
Where ground vibration is of a relatively continuous nature, there is a greater likelihood of
structural damage occurring, compared to transient vibration; for example that caused by
transiting vehicles.
12.19
BS5228-2 indicates that the threshold of perception is generally accepted to be between a
peak particle velocity (PPV) of 0.14 and 0.3mm/sec. In an urban situation it is unlikely
that such vibration levels would be noticed. The Highways Agency Research report No. 53
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“Ground Vibration caused by Civil Engineering Works” 1986 suggests that, when vibration
levels from an unusual source exceed the human threshold of perception, complaints may
occur. The onset of complaints due to continuous vibration is probable when the PPV
exceeds 3mm/sec.
12.20
British Standard BS6472: 2008 “Guide to Evaluation of human exposure to vibration in
buildings. Part 1: Vibration sources other than blasting” (BS6472-1) suggests that adverse
comments or complaints due to continuous vibration are rare in residential situations
below a PPV of 0.8mm/sec.
12.21
Continuous vibration is defined as “vibration which continues uninterrupted for either a
daytime period of 16 hours or a night-time period of 8 hours”. The proposed earthworks
and construction works at the site will not cause continuous vibration as defined in
BS6472-1.
12.22
BS5228-2 2009 suggests that the onset of cosmetic damage is 15mm/sec (15 mm/s at 4
Hz increasing to 20 mm/s at 15 Hz for residential or light commercial type buildings).
Operational Phase Assessment
Road Traffic Noise and Existing Sensitive Receptors
12.23
The operational phase of the development will generate additional traffic movements on
the existing road network. These additional vehicle movements have the potential to
increase road traffic noise levels at existing receptors located adjacent to the main routes
to and from the development.
12.24
The traffic flows have been predicted using the computer modelling software SoundPLAN
Version 7.1. The computer modelling methodology conforms to the calculation procedures
set out in the Department of Transport’s memorandum, “Calculation of Road Traffic Noise”
(CRTN), 1988. The memorandum was prepared to enable entitlement under the Noise
Insulation Regulations 1975 to be determined; but it is stated in the document, that the
guidance is equally appropriate for the calculation of traffic noise for land use planning
purposes.
12.25
The procedures outlined in CRTN assume typical traffic and noise propagation conditions
that are consistent with moderately adverse wind velocities and directions during specified
periods. In CRTN, all noise levels can be expressed in terms of the index L10 (18 hour) dB(A).
12.26
The changes in road traffic noise levels have been assessed against a set of significance
criteria based upon guidance contained within the Design Manual for Roads and Bridges,
Volume 11, Section 3, Part 7, 2011 (DMRB) for the assessment of long term changes in
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road traffic noise. The criteria do not relate to the actual existing noise levels (i.e. traffic
noise due to the current development) but only the predicted changes.
Proposed Residential Areas
Noise Policy Statement for England, 2010
12.27
The potential impacts of the existing and future sources of noise at the proposed
residential areas of the proposed development have been assessed in accordance with the
Noise Policy Statement for England (NPSE) March 2010 as required by the National
Planning Policy Framework.
12.28
The NPSE discusses noise impacts in accordance with concepts established by the World
Health Organisation. NPSE does not set specific adverse effect levels in order to provide
for the necessary policy flexibility.
12.29
However, in the absence of absolute levels, it is considered appropriate to assess noise
levels across the developed in accordance with the World Health Organisation’s
“Guidelines for Community Noise”, 1999.
World Health Organisation Guidelines for Community Noise, 1999:
12.30
The World Health Organisation’s “Guidelines for Community Noise”, 1999 (WHO) suggest
appropriate criteria and noise limits for outdoor living areas and habitable rooms of
residential dwellings. In accordance with the requirements of WHO, the following external
and internal noise limits, for noise from external sources, will need to be met within
sensitive areas of the residential dwellings:
·
55dB LAeq (16 hour) during the daytime in outdoor living areas;
·
35dB LAeq
(16 hour)
during the daytime in noise sensitive rooms other than
bedrooms;
·
30dB LAeq (8 hour) during the night-time in bedroom areas.
·
45dB LAf,max should not be exceeded during the night-time in bedroom areas.
·
British Standard 4142:1997 Method for rating industrial noise affecting mixed residential
and industrial areas (BS4142):
12.31
Where industrial noise is dominant, BS4142 is used to assess the impact of the noise.
Therefore, in addition to the assessment in accordance with WHO, a BS4142 assessment
has been carried out to consider the potential noise impact of existing industrial premises,
on residential areas of the development.
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12.32
The purpose of the BS4142 assessment procedure is to assess whether noise levels from
factories, industrial premises, fixed installations or sources of noise of an industrial nature
in commercial premises, are likely to give rise to complaints from people residing nearby.
12.33
BS4142 refers to noise from the industrial source as the ‘specific noise’. BS4142 assesses
the likelihood of complaint by comparing the specific noise level to the background noise
level (LA90).
12.34
Certain acoustic features can increase the likelihood of complaints over that expected from
a simple comparison between the specific noise level and the background noise level. In
particular BS4142 identifies noise that contains discrete impulses and/or audible tonal
qualities and in these cases recommends that a 5dB correction be added to the specific
noise level. The specific noise level along with any applicable correction is referred to as
the ‘rating level’. The greater the difference between the rating level and the background
noise level, the greater the likelihood of complaints.
12.35
The assessment considers the following potential impacts associated with the proposed
development:
·
Construction Phase: Impact of noise and vibration, from the earthworks and
construction of the development on sensitive receptors.
·
Operational Phase – Road Traffic Noise and Existing Sensitive Receptors: Impact
of noise on sensitive receptors due to development generated traffic using the
existing road network.
·
Operational Phase Assessment – Proposed sensitive receptors and noise: It has
been necessary to consider the noise levels at noise sensitive areas of the
proposed development, i.e. proposed residential areas.
12.36
It is considered that the levels of vibration at the existing industrial premises will not
significantly affect the proposed sensitive areas of the development i.e. the proposed
residential dwellings. Vibration from the existing industrial premises has not therefore
been considered.
Construction Phase
12.37
For the purposes of this assessment, the occupants of existing residential properties in the
vicinity of the site are considered to be the receptors most likely to be affected by the
construction phases of the development. Details of the receptors are set out in Table
12.1.
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Table 12.1 Existing Noise Sensitive Receptor Locations
Bearing
from Site
Receptor
12.38
Approximate Distance
to Site Boundary
Existing residential properties along
Copeland Drive, adjacent to the site
boundary
West
10m at closest point
Existing residential property off Rectory
Lane, boarded by the site boundary to the
north and west
South east
Existing residential property opposite the
development site, off Rectory Lane
South east
The vibration assessment for the construction phase outlines the main construction
activities that could give rise to vibration impacts at receptors in the vicinity of the
proposed development. It also sets out details of ‘best practice’ management and control
measures to ensure that impacts are minimised as far as possible.
Noise from Construction Vehicles
12.39
In addition to the earthworks and construction activities, vehicle movements to and from
the proposed development have the potential to generate noise at existing sensitive
receptors, in the immediate vicinity of the local road network.
12.40
At this stage, detailed traffic data relating to the likely numbers of construction vehicles is
not available. However, the number of construction vehicles is not considered to be
significant relative to the existing flows on the major road links surrounding the
development site. It is therefore considered that the level of road traffic noise at sensitive
receptor locations will not change significantly, due to construction vehicles during the
construction phases of the development, and this impact has not there been considered
further.
Operational Phase - Road Traffic Noise and Existing Sensitive Receptors
12.41
The current and future traffic noise levels at a number of sensitive receptors; both with
and without the development in place, have been predicted using the computer modelling
software SoundPLAN Version 7.1. The computer modelling methodology conforms to the
calculation procedures set out in the Department of Transport’s memorandum,
“Calculation of Road Traffic Noise” (CRTN), 1988.
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