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Great Billing STC Biosolids Resilience

Scheme (SEW-09683)

Preliminary Ecological Assessment

January 2014

Anglian Water Services Limited

279559 EVT EMS 007 C

http://pims01/pims/llisapi.dll/open/1544785550

17 January 2014

Great Billing STC Biosolids Resilience Scheme (SEW-09683)


Great Billing STC Biosolids Resilience Scheme (SEW-09683)


January 2014

Anglian Water Services Limited

Mott MacDonald, Demeter House, Station Road, Cambridge CB1 2RS, United Kingdom

T +44 (0)1223 463500 F +44 (0)1223 461007 W www.mottmac.com

Thorpe Wood House, Thorpe Wood, Peterborough, PE3 6WT

Great Billing STC Biosolids Resilience Scheme (SEW-09683) Preliminary Ecological Assessment

279559/EVT/EMS/007/C 17 January 2014 http://pims01/pims/llisapi.dll/open/1544785550

Revision Date Originator Checker Approver Description StandardA December 2013 P. McDonald V. Alexander

R. Mackay R. Lee Issue to client

B December 2013 P. McDonald R. Mackay R. Lee Issue for planning

C January 2014 P. McDonald R. Mackay R. Lee Updated issue for planning

Issue and revision record

This document is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose.

We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties.

This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it.



Chapter Title Page

Executive Summary i

1 Introduction 1

1.1 The proposed development ___________________________________________________________ 1 1.2 Site location _______________________________________________________________________ 1 1.3 Proposed construction schedule _______________________________________________________ 2 1.4 Purpose of this report ________________________________________________________________ 2 1.5 Zone of Influence ___________________________________________________________________ 3

2 Legislation and Policy 5

2.1 Introduction ________________________________________________________________________ 5 2.2 Legislation ________________________________________________________________________ 5 2.3 Biodiversity Action Plan ______________________________________________________________ 5 2.4 National Planning Policy Framework ____________________________________________________ 5 2.5 Local planning policy ________________________________________________________________ 6

3 Methodology 8

3.1 Desk study ________________________________________________________________________ 8 3.2 Extended Phase 1 Habitat Survey ______________________________________________________ 8 3.3 Assessment of conservation importance and likely impacts ___________________________________ 8 3.4 Mitigation and enhancement __________________________________________________________ 9

4 Ecological Features 10

4.1 Introduction _______________________________________________________________________ 10 4.2 Designated sites for nature conservation ________________________________________________ 10 4.3 Habitats _________________________________________________________________________ 11 4.4 Protected, notable and invasive plant species ____________________________________________ 12 4.5 Protected and notable animal species __________________________________________________ 12

5 Mitigation and Enhancement 16

5.1 Further surveys ___________________________________________________________________ 16 5.2 Mitigation ________________________________________________________________________ 16 5.3 Enhancement _____________________________________________________________________ 17

6 Conclusion 19

7 References 20

Appendices 21

Appendix A. Target Notes ______________________________________________________________________ 22 Appendix B. Phase 1 Habitat Map _______________________________________________________________ 25

Contents


i 279559/EVT/EMS/007/C 17 January 2014 http://pims01/pims/llisapi.dll/open/1544785550

Mott MacDonald has been commissioned by Anglian Water Services (AWS) to

prepare a Preliminary Ecological Appraisal (PEA) for a planning application to

construct an additional Digester and Combined Heat and Power (CHP) plant at

the existing Great Billing Water Recycling Centre (WRC) site. This will increase

power generation and ensure standby capacity when the existing CHP plant is

unavailable.

The aims of this PEA are as follows:

� To map the habitats within the survey area;

� To assess the conservation value and likely impacts on ecological features; and

� To specify mitigation, further surveys and enhancement measures to benefit

biodiversity.

This PEA includes a desktop study and an Extended Phase 1 Habitat Survey

within the WRC site boundary.

Great Billing WRC does not lie in any statutory sites for nature conservation.

Within approximately 2km of the WRC there are three statutory sites and thirteen

non-statutory sites for nature conservation. None of these designated sites will be

adversely affected due to the small-scale and location of the proposed

development within the WRC.

The area in which the proposed CHP and flue stack will be situated predominantly

comprises hard standing. The area where the proposed digester will be located

comprises amenity grassland and an area of gravel which has been colonised by

tall ruderal species and sycamore saplings. The proposed temporary construction

compound will be located on amenity grassland. Adjacent to the compound and

digester location is an area of semi-natural broadleaf woodland which is a Section

41 priority habitat (formerly UKBAP). The habitats which will be affected by the

proposed development are considered to be of ‘site only’ conservation

importance.

There is suitable habitat for breeding birds in the trees on site. Some saplings

which may offer enough cover for nesting birds may require removal. If these are

removed during the breeding season (March-August) this will be done under

Executive Summary


ii 279559/EVT/EMS/007/C 17 January 2014 http://pims01/pims/llisapi.dll/open/1544785550

ecological supervision. As there are species such as pied wagtail on site, which

are known for nesting on manmade structures and inside pipes, all plant and

equipment will be carefully stored to reduce potential for the creation of suitable

nesting sites. These measures will include:

� Plugging the end of any stored pipe-work; and

� Ensuring plant is not left standing in the same location for extended periods of

time.

As badgers are known to be present in the area of the proposed digester, the

following measures will be implemented:

� A toolbox talk will be given to all site staff notifying them that badgers are

present on site and may be foraging around the construction areas at night;

� Any excavations deeper than 0.5m will be covered at night and an egress route

provided to prevent badgers becoming trapped (such as propping a plank up

the side of the excavation);

� Avoid vegetation removal directly in front of the retaining wall in the woodland

(the area between the two gas holders) in order to keep the area under cover;

� Erect Heras style demarcation fencing along the woodland edge to prevent

construction personnel from entering the woodland, ensuring the habitat as a

whole is not damaged or disturbed; and

� The contractor will add information on badger onto the site hazard plans,

Construction Environmental Management Plan (CEMP) and any other relevant

documents.

Low level security and maintenance lighting will be installed as part of the

proposed development. These lights will be triggered by movement and are

localised to the proposed development. It is not envisaged that these will impact

any areas suitable for foraging bats. Good lighting practice will be adhered to in

respect of bats (construction and permanent), including the following guidance

from Bats and Lighting in the UK (Bat Conservation Trust, 2008):

� Installation of lighting at the lowest practicable height;

� Lowest practicable strength of light is used;

� All lighting is angled downwards;

� Hoods or cowls are fitted to reduce light-spill; and


iii 279559/EVT/EMS/007/C 17 January 2014 http://pims01/pims/llisapi.dll/open/1544785550

� Illuminating linear edges will be avoided where bats may be foraging such as

woodland edges or hedgerows.

In order to ensure that AWS fulfils its duty under Section 40 of the Natural

Environment and Rural Communities Act 2006, the following enhancement

measures below will be incorporated into the proposed development:

� 5no 28mm holed boxes erected on trees, suitable for blue tit (Cyanistes

caeruleus);

� 5no 32mm holed boxes erected on trees, suitable for great tit (Parus major);

and

� 5no bat boxes erected within the existing trees at the WRC site.

With the implementation of the proposed mitigation and enhancement measures,

no significant impacts are anticipated on designated sites, habitats or species.



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The Sludge Treatment Centre (STC) at Great Billing Water Recycling Centre (WRC) currently has

insufficient capacity to maximise the digestion period and produce maximum volumes of biogas. In

addition, there is no standby capacity when the existing Combined Heat and Power (CHP) plant is

unavailable. As such, gas production and power generation is not optimised.

The proposed development (known as the Great Billing STC Biosolids Resilience Scheme) will provide an

additional sludge digester to increase the overall retention and digestion time of the sludge, and thus

maximise biogas production and power generation. The proposed development will also provide a stand-

by CHP plant to provide capacity when the existing CHP plant is unavailable, due to maintenance etc. The

total volume of sludge treated by the STC will remain the same.

This document is a supporting document to a planning application for the proposed development.

The applicant is Anglian Water Services Limited (AWS). This planning application is submitted on behalf of

AWS by Mott MacDonald.

1.1 The proposed development

The following proposed structures and undertakings are subject to this planning application.

Table 1.1: Structures subject to this planning application

Component Drawing

Demolition of 2no. existing gas holders SEW-09683-GIBLST-2G-PLG-403

Installation of 1no. 1.5MW Containerised CHP Engine, intercooler and jacket radiator

SEW-09683-GIBLST-2G-PLG-410

Erection of 1no. flue stack SEW-09683-GIBLST-2G-PLG-420

Installation of 1no. 11KV transformer SEW-09683-GIBLST-2G-PLG-422

Erection of 1no. digester and 3 no. mixer pumps SEW-09683-GIBLST-2G-PLG-423

Installation of 1no. digester Motor Control Centre (MCC) kiosk SEW-09683-GIBLST-2G-PLG-424

Installation of pipe supports SEW-09683-GIBLST-2G-PLG-403

Erection of acoustic fencing SEW-09683-GIBLST-2G-PLG-430

Construction of a temporary construction compound SEW-09683-GIBLST-2G-PLG-400

Associated landscaping SEW-09683-GIBLST-2G-PLG-417

1.2 Site location

Great Billing WRC is located on the south-east edge of Northampton at national grid reference SP 817

619. The site is bounded by the A45 to the north and the River Nene to the south.

The location of the proposed development is shown on drawing SEW-09683-GBILST-2G-PLG-400 which

accompanies this planning application.

1 Introduction



2

1.3 Proposed construction schedule

The construction methodology has not been finalised. However, the anticipated sequence of construction

is set out below:

� Initial excavation to include removal (excavation) of top soil to reduce ground level locally;

� Diversion of services (including excavation of new trench and laying of new pipework and cables);

� Pilling of foundations for digester and flue stack with continuous flight auger (CFA) piling (including

importing and installation of a granular pilling mat), and delivery of concrete and reinforcement. Piling

activities will also include removal of excess piling matt;

� Drainage and cable ducting installation (to include delivery of pipework/ducting and excavation of

trench and laying of pipework/ducting). This phase will include backfilling of the trench with granular

material;

� Construction of reinforced concrete slab foundations for all structures (to include laying of granular sub-

base by excavator and roller). This phase will also include delivery and assembly of steel

reinforcement, temporary works, and delivery and pouring of concrete;

� Digester assembly to include the following:

– Delivery of steel tank panels;

– Digester roof constructed on base slab and lifted, followed by construction of wall sections;

– Access gantry delivered and assembled (with crane and high level access);

– Mixer pumps and associated pipework and cabling delivered and installed;

– MCC kiosk delivered and installed;

– Above-ground pipe and cable supports delivered and installed with crane.

� Installation of CHP, Flue Stack and Transformer to include the following:

– Delivery to site in sections and lifted into place with crane;

– Assembly of parts; and

– Installation of pipework and electrical cabling.

Construction of the proposed development will take place between March 2014 and October 2014.

Demolition of the existing redundant gas holders is anticipated to take place in the first three months of the

construction phase. All construction activity will take place within the WRC and in the vicinity of the STC.

The temporary site compound will be reinstated to its original condition of completion of construction

activities.

1.4 Purpose of this report

The objective of this Preliminary Ecological Assessment (PEA) is as follows: � To undertake a desk study using biological records to identify designated sites and records of

protected and notable species within 2km;

� To identify and map the habitats within the Zone of Influence (ZoI), and record the locations of any

invasive plant species;

� To assess the likelihood of protected species being present on, near or adjacent to the proposed

development during construction and operation;

� To outline mitigation during construction and operation;



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� To outline enhancement measures to be undertaken at the STC; and

� To outline scheduling for further surveys, if required.

The following ecological features have been considered as part of this assessment:

� Designated sites;

� Habitats;

� Protected and invasive plant species;

� Great crested newts;

� Reptiles;

� Dormice;

� Bats;

� Badgers;

� Otter;

� Water vole;

� Birds; and

� White-clawed crayfish.

The likely impacts of the proposed development have been assessed for each ecological feature, for both

the construction and operational phases of the development. The likely impacts assessed include:

� Loss of habitat under the footprint of the works;

� Removal of vegetation which may affect breeding bird and bats;

� Noise, which may affect bats and badgers; and

� Lighting (temporary and permanent) which may affect foraging bats.

Following the site visit, where there was no suitable habitat present for a particular protected species, or

that species is very unlikely to be present within the ZoI, these have been scoped out from further

assessment. As such, the following features have been scoped out from further assessment:

� Dormice (no suitable habitat);

� Otter (no suitable habitat);

� Water vole (no suitable habitat); and

� White-clawed crayfish (no suitable habitat).

It is concluded that no significant impacts are anticipated. This conclusion is discussed in Section 4 of this

assessment.

1.5 Zone of Influence

The current guidance on ecological assessments recommends that all ecological features that occur within

a zone of influence (ZoI) for a proposed development are investigated (IEEM, 2006). The potential ZoI

includes: � Areas directly within the land take for the proposed development and access;

� Areas that will be temporarily affected during construction;

� Areas likely to be impacted by hydrological disruption; and

� Areas where there is a risk of pollution and noise disturbance during construction and/or operation.



4

The ZoI depends on the ecological features concerned and the nature of the project. For the purposes of

the proposed development the ZoI is defined as:

� The working area, for habitats and protected/notable species;

� A study area extending to 1km from the working area, for non-statutory designated sites and biological

records; and

� A study area extending to 2km from the working area, for statutory designated sites.



5

2.1 Introduction

This section identifies the relevant legislation and planning policies that are relevant to the proposed

development.

2.2 Legislation

The proposed development must comply with International, European and UK nature conservation

legislation and with national and local biodiversity policies. The main pieces of UK legislation on nature

conservation are as follows:

� Wildlife and Countryside Act 1981 (as amended);

� Conservation of Habitats and Species (Amendment) Regulations 2012; and

� Section 41 of the Natural Environment and Rural Communities (NERC) Act 2006.

2.3 Biodiversity Action Plan

The biodiversity action plan relevant to the proposed development is the Northamptonshire Biodiversity

Action Plan (LBAP).

2.4 National Planning Policy Framework

The National Planning Policy Framework (NPPF) provides planning policy guidance at a national level.

The NPPF promotes a ‘presumption in favour of sustainable development’. This presumption requires that

economic, social and environmental considerations should all be assessed in determining development

proposals. The NPPF is clear that development proposals that are considered ‘sustainable’ and that

accord with the development plan should be approved without delay. Relevant policies contained in the

NPPF are outlined below.

The NPPF requires that the planning system should contribute to and enhance the natural and local

environment by:

� Protecting and enhancing valued landscapes, geological conservation interests and soils;

� Recognising the wider benefits of ecosystem services;

� Minimising impacts on biodiversity and providing net gains in biodiversity where possible; and

� Preventing both new and existing development from contributing to or being adversely affected by

unacceptable levels of soil, air, water or noise pollution or land instability.

2 Legislation and Policy



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2.5 Local planning policy

2.5.1 The Northamptonshire Core Strategy Development Plan Document 2010

The Northamptonshire Core Strategy was formally adopted in May 2010. The document outlines the

strategic strategy for waste within the county up to 2026.

� Policy CS14 seeks to ensure that waste development does not have a detrimental effect on the built or

natural environment.

2.5.2 The Northamptonshire Control and Management of Development Plan 2011

Part of the supporting documents to the Minerals and Waste Core Strategy is the Control and Management

of Development DPD. This was adopted in 2011 and provides additional supporting policies to the Core

Strategy. Applicable policies are:

� Policy CMD 7 sees to ensure that waste development achieves a net gain in natural assets and

environmental resources by;

– Protecting and enhancing green infrastructure and biodiversity networks;

– Contributing towards the county biodiversity action plan for habitats and species; and

– Where necessary undertaking appropriate mitigation to reduce and manage any adverse impacts.

� Policy CMD 8 identifies that waste development should reflect the landscape character of

Northamptonshire. Appropriate mitigation should be undertaken to reduce any adverse impacts.

Development should reflect the assets of local distinctiveness or character and should consider

opportunities for enhancement.

2.5.3 The Northamptonshire Minerals and Waste Development Framework Partial

Review (Submission Plan) 2013

A Partial Review of the adopted Minerals and Waste Development Framework (MWDF)/Local Plan is now

underway. This is bringing together the separate elements of the adopted MWDF into one combined Local

Plan and extending the plan period to 2031. As such, the policies contained within this document hold

material weight in the determination of this planning application (equivalent policies in the MWDF are given

in brackets):

� Policy 22 (CS14) seeks to ensure that waste facilities:

– Protect Northamptonshire’s natural resources and environmental designation;

– Avoid and minimise any adverse impacts to an acceptable level and address air emissions

(including dust), odour, noise and vibration;

– Are designed to be in keeping with the local area;

– Are safe, sustainable and environmentally acceptable; and

– Protect local amenity.

� Policy 24 (CMD7) seeks to ensure that waste development achieves a net gain in natural assets by:

– Protecting and enhancing green infrastructure and biodiversity networks;

– Contributing towards the county biodiversity action plan for habitats and species; and

– Where necessary undertaking appropriate mitigation to reduce and manage any adverse impacts.



7

� Policy 25 (CMD8) identifies that waste development should reflect the landscape character of the

Northamptonshire. Appropriate mitigation and mitigation should be undertaken to reduce any adverse

impacts. Development should reflect the specific assets of local distinctiveness or character.

2.5.4 The West Northamptonshire Joint Core Strategy 2011

The West Northamptonshire Joint Planning Unit is the body responsible for producing the Joint Core

Strategy for West Northamptonshire (WNJCS), which covers Northampton Borough, South

Northamptonshire Council and Daventry District Council. The WNJCS has been publicly consulted upon

and has been submitted for independent examination and therefore carries material weight in the

determination of planning applications. Relevant polices are:

� Policy S1 is concerned with the appropriate location of development within Northampton; and

� Policy BN2 identifies that development that has the potential to harm biodiversity must use methods to

conserve and enhance it throughout design and implementation.

2.5.5 North Northamptonshire Emerging Joint Core Strategy 2021-2031

The first Core Strategy was adopted in 2008 and covers the period to 2021. It is being reviewed to take

account of the recession delaying development and infrastructure investment, and to plan forward to 2031.

The review is also responding to the Government’s reforms to the planning system, including the NPPF

and the proposed revocation of Regional Plans. Consultation of an initial draft of this document has been

undertaken (ending in October 2013) and certain material weight can be afforded to its policies:

� Draft Policy 3 seeks to ensure that development does not significantly harm geo-diversity or

biodiversity; and

� Draft Policy 26 addresses renewable energy and decentralised energy networks. and seeks to sensure

that the most appropriate technology is selected in respect of sites characteristics and that

development mitigates against any harm to the built and natural environment during construction and

implementation.

2.5.6 Northampton Local Plan ‘saved’ polices

The current adopted planning policy document for the area is the Northampton Local Plan ‘saved’ Policies,

adopted in 1997. In 2007 the Secretary of State approved for policies of the Local Plan 1997 to be saved.

Relevant policies are:

� Policy E11 identifies that development that would involve the destruction or substantial damage to

trees, hedgerows or woodland would be denied planning permission; and

� Policy E12 ensures sites that currently have hedgerows, trees or woodland on the site should make

adequate provision to incorporate it into development without having a significant detrimental impact.



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3.1 Desk study

The desk study included a review of the designated sites, habitats, and protected and notable species

records within 1km of the study site (2km for statutory designated sites). Data was obtained by searching

the Multi-Agency Geographic Information for the Countryside (MAGIC) online database as well as from

biological records provided by the Northamptonshire Biodiversity Records Centre (NBRC).

3.2 Extended Phase 1 Habitat Survey

An Extended Phase 1 Habitat Survey was undertaken of the working area and adjacent vegetated areas.

It included a walkover, mapping and an assessment of the potential for the habitats to support notable and

protected species. This survey was undertaken on 17 October 2013 by a qualified Ecologist.

The habitat types were identified and mapped in compliance with the ‘Handbook for Phase 1 Habitat

Survey: a Technique for Environmental Audit’ (Joint Nature Conservation Committee JNCC, 2010).

Dominant plant species were noted, as were any protected, uncommon, invasive species or species

indicative of particular habitat types. There was no attempt to compile exhaustive species lists. Botanical

nomenclature in this report follows Stace (2010) for both scientific and English names. Scientific names are

only mentioned the first time the species occur in the report.

The survey included an assessment of the likelihood of protected and notable animal species being

present within the site, following the methodologies in the ‘Guidelines for Baseline Ecological Assessment’

(EIA, 1995). The survey was not completed at a suitable time of year to identify all plant species. However

given the habitats present this is not considered to be a significant constraint.

3.3 Assessment of conservation importance and likely impacts

The conservation importance was assessed for each of the main ecological features (designated sites,

habitats and species) that occur within the ZoI. The following criteria were used in the assessment of the

conservation importance:

� Designation of the site;

� Rarity of the species or habitats;

� Presence of Red Data Book (RDB) or endemic species;

� Presence of diverse assemblages of plants or animals;

� Plant communities typical of natural/semi-natural habitats;

� Habitat diversity and connectivity;

� Presence of large populations of animals which are uncommon or threatened in a wider context; and

� Presence of species listed on Section 41 of the Natural Environment and Rural Communities (NERC)

Act, 2006 and LBAP species/habitats (CIEEM, 2006).

The assessment of conservation importance in this report makes reference to the geographical scale of

international, national, regional/county, district/borough, local and site only (CIEEM, 2006).

3 Methodology



9

An assessment was made of the likely impacts of the development on designated sites, habitats and

species. The assessment is based on the CIEEM guidelines for Ecological Impact Assessment

(IEEM, 2006), using the following:

� Certain;

� Probable;

� Unlikely; and

� Extremely unlikely

3.4 Mitigation and enhancement

Where potential ecological impacts have been identified, appropriate mitigation measures have been

incorporated into the proposed development.

Under the NERC Act 2006, public authorities have a duty to conserve biodiversity:

“Every public authority must, in exercising its functions, have regard, so far as it consistent with the proper

exercise of those functions, to the purpose of conserving biodiversity.”

To ensure AWS fulfils its duty under NERC Act 2006, ecological enhancement measures are set out in this

report.



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4.1 Introduction

This section includes descriptions of the key ecological features identified during the desk study and

recorded during the field survey. An evaluation of the protection status and nature conservation importance

is provided along with an initial assessment of the likely impacts on these ecological features, during

construction and operation

4.2 Designated sites for nature conservation

4.2.1 Statutory designations

There are two statutory designated sites within 2km of Great Billing WRC, namely:

� The Upper Nene Valley Gravel Pits Special Protection Area (SPA), Site of Special Scientific Interest

(SSSI) and Ramsar site is located 1.9km south-west of the proposed development. The site is

designated for its internationally important numbers of over wintering birds including Eurasian bittern

(Botaurus stellaris), golden plover (Pluvialis apricaria) and gadwall (Anas strepera). This site is of

international conservation importance; and

� Lings Wood Local Nature Reserve (LNR) is designated for its woodland, scrub and acid grassland

habitats and is located 1.7km north west of the proposed development. This site is of county

conservation importance.

Due to the distance of the proposed development and its location within the existing WRC, adverse

impacts on these sites are considered to be extremely unlikely during construction or operation.

4.2.2 Non-statutory designations

There are 13 non-statutory designated sites within 1km of the WRC site, as follows:

� 3 County Wildlife Sites (CWS);

� 3 Local Wildlife Sites (LWS); and

� 7 Potential Wildlife Sites (PWS).

PWS are sites which have the potential to become a LWS or CWS in future once surveys confirming

species diversity or certain habitat management/improvements have been carried out. At the request of

Northamptonshire County Council, these sites should be treated the same as actual LWS/CWS during the

planning process. The non-statutory designations are outlined in Table 4.1.

Table 4.1: Non-statutory designated sites

Site Description

Distance and direction from

proposed development

Ecton Brook Park CWS Amenity park alongside Ecton Brook with good tree diversity 0.3km N

Ecton Backwater CWS Backwater to the River Nene with high emergent plant species 0.8km S

4 Ecological Features



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Site Description

Distance and direction from

proposed development

diversity

Little Billing Lake CWS Large lake with 8 wetland indicator species 1km NW

Billing Aquadrome LWS Series of lakes and channels with 13 wetland indicator species recorded

1km SW

Ecton Gravel Pits LWS Three flooded gravel pits now angling lakes, good diversity of marginal plants and a small area of woodland

1km E

Billing Fishponds LWS Two fish ponds surrounded by trees 0.9km W

Billing East Lagoon PWS Former CWS, flooded gravel pit 0.75km SE

Billing Scrub PWS Former CWS, offers largest area of undisturbed water and scrub in the Ecton/Billing area. Badger sett present.

0.5km S

Billing Sewage Work PWS Area of rough grassland 0.25km S

Billing West Lagoon PWS Former gravel pit with scrub edges 0.6km S

Billing West Lagoon Grassland PWS

Value a buffer habitat between the areas of the Upper Nene Valley Gravel Pits SPA

0.8km S

Ecton Backwater Meadow PWS

Cattle grazed semi-improved grassland 0.95km S

Great Billing Pocket Park PWS

Deciduous plantation 0.8km N

Source: Northamptonshire Biodiversity Records Centre

These sites are of county conservation importance. Due to the small scale of work and its location within

the existing plant in the WRC, impacts on these sites as a result of the proposed development are

considered extremely unlikely during both construction and operation.

4.3 Habitats

Great Billing WRC comprises operational buildings, plant and hard-standing with some areas of landscape

planting. Within the survey area (as shown by the red line boundary on the Phase 1 Habitat map) around

the proposed development there are two main areas where construction work will be undertaken. These

areas are outlined in the Target Notes (TN) in Appendix A and shown on the Phase 1 Habitat Map in

Appendix B.

The proposed development site currently comprises hard-standing and will be situated adjacent to existing

equipment. There are some small areas of amenity grassland and grassy soakaway areas within the

survey area (TN7 and TN8). However these areas will not be affected by the proposed development. A

further soakaway is located to the east approximately 200m from the proposed CHP location.

The area where the existing gas holders will be demolished and replaced with the new digester is

surrounded by short mown amenity grassland. Around the northern gas holder the area is surrounded by

gravel which has been colonised by tall ruderal vegetation including common teasel (Dipsacus fullonum),



12

spear thistle (Cirsium vulgare) and rosebay willowherb (Chamerion angustifolium) (TN5). The new digester

kiosk and a section of new connecting pipework will be sited in this area.

The footprint of the proposed digester will be located partially on amenity grassland and partially on the

gravel area. To the west of the existing gas holders is an area of semi-natural broadleaved woodland

which runs west to Crow Lane (approx 0.7ha in size), TN1. This is dominated by ash (Fraxinus excelsior)

and sycamore (Acer pseudoplatanus). Sycamore saplings have colonised the gravel area.

The proposed temporary site compound will be located on an area of amenity grassland and hard-standing

to the south of the woodland (TN4).

The habitats which will be affected by the proposed development (amenity grassland and tall ruderal) are

considered to be of site only conservation importance.

The area of woodland is an S41 priority habitat and is therefore considered to be of county conservation

importance. However it will not be affected by the proposed development and will be protected during

construction.

Impacts on habitats during construction are certain as there will be a permanent loss of amenity grassland

and tall ruderal vegetation under the footprint of the new digester. However given the type of habitat and

small amount of loss, this impact is considered to be not significant. There are no anticipated impacts on

habitats during operation.

4.4 Protected, notable and invasive plant species

No protected, notable or invasive plant species listed on Schedules 8 and 9 of Wildlife and Countryside

Act, 1981 (as amended) were recorded during the survey.

There are no historical biological records for invasive plant species within 2km of the site.

4.5 Protected and notable animal species

This section comprises a brief description of the actual and/or potential presence/absence of protected and

notable animal species occurring within the site.

4.5.1 Birds

All nesting birds are protected in the UK under the Wildlife and Countryside Act 1981 (as amended). Some

species listed on Schedule 1 of the same Act receive further protection from disturbance whilst breeding.

Twelve species of birds were recorded at the site during the walkover survey. Two species are Amber

listed Birds of Conservation Concern (BoCC) (Eaton et al 2009) – black headed gull (Choricocephalus

ridibundus) and grey wagtail (Motacilla cinerea).



13

There are several previous records of bird species within 2km, these are largely aquatic or wader species

and there is no suitable habitat for these species within the proposed development site.

There is suitable habitat for nesting birds in the broadleaved woodland (TN1). However this area will not be

affected by the proposed development. The only vegetation removal required will be clearing the saplings

and ruderal vegetation from the gravel area. However some of these may be large enough to provide

sufficient cover to support nesting birds

The bird assemblage at the site is considered to be of local conservation importance. Currently impacts are

considered to be unlikely during construction. However if vegetation removal is required during the

breeding season (March to August) impacts would be near certain but can be minimised as far as possible

through the implementation of the mitigation described in Section 5 of this document. Impacts during

operation are likely to be beneficial due to the proposed enhancement measures which will be

implemented (described in Section 5.3.1).

4.5.2 Bats

All bats are protected in the UK under the Wildlife and Countryside Act, 1981 (as amended) and the

Conservation of Habitats and Species (Amendment) Regulations 2012. Seven bats are also priority

species listed on Section 41 of the NERC Act, 2006.

No buildings or trees suitable for bats were recorded during the survey. There are previous records of a

pipistrelle roost (Pipistrellus sp.) and a brown long-eared roost (Plecotus auritus) within 1km.There are

likely to be trees suitable for roosting bats within the broadleaf woodland (TN1). However these areas will

not be affected by the proposed development. The trees at the edge of the woodland which are adjacent to

the gas holders to be demolished comprise semi-mature sycamore and ash, with one Scot’s pine (Pinus

sylvestris) tree. There were no features visible on these trees that are suitable for roosting.

It is likely there are bats foraging around the edges of the site as a whole where suitable linear features

exist, such as woodland and scrub edges. As such, consideration will be given to any proposed permanent

lighting, using best practice guidance given in Bats and the Built Environment: Bats and Lighting in the UK

(Bat Conservation Trust, 2008) (see Section 5).

All bats are considered to be of international conservation importance. However, they are unlikely to be

affected by the proposed development. Impacts on bats are considered to be unlikely during construction.

With best practice guidelines regarding lighting being implemented as described in section 4.2.4, and the

enhancement measures described in Section 5.3.2, impacts on bats during operation are likely to be

neutral/positive.

4.5.3 Badgers

Badgers are protected under the Protection of Badger Act 1992. Active setts are also protected from

disturbance or damage.



14

There is a small brick retaining wall housing a ceramic pipe situated approximately 5m inside the woodland

(TN2). There is no corresponding end to the pipe. There is no spoil pile outside the pipe, however there is

a well-used path passing the entrance to the pipe with badger footprints and hairs. Approximately 2m from

the pipe entrance is a well-used badger latrine. Along the southern edge of the woodland another fresh

latrine is present (TN3). Further into the woodland a series of eight entrances appear to be a former

badger sett which has been disused for some time (TN6). Six of the entrances were either partially

collapsed or clogged with leaf litter, and two of the entrances showed signs of rabbit activity. This area is

approximately 40m from the proposed development.

To determine whether the pipe was being utilised by badgers as a sett, an infrared motion activated remote

camera was placed adjacent to the pipe to record any activity in the area. The camera was in place from

01 November 2013 to 12 November 2013.

The footage showed a fox using the pipe as a day time shelter, and a badger was seen to enter the pipe

on one occasion and emerged after 20 minutes (between 01:00 and 01:20). Badgers were seen grooming

and scent marking against the retaining wall on numerous occasions. There was no evidence of badgers

utilising the pipe during the day and it appears that the pipe and retaining wall are used more as a

sheltered location for grooming and as a landscape feature within the territory suitable for a latrine.

In the context of the proposed development site, badgers are considered to be of local conservation

importance.

As it has been demonstrated that the pipe is not an active sett, it is considered that a licence from Natural

England is not required. Impacts on badgers during construction are considered unlikely with the

implementation of the mitigation measures described in Section 5.2.3 of this assessment. Noise from

construction would not have an adverse effect on the local badger population as there are no setts in the

vicinity. However as badgers are known to be in the close vicinity mitigation is required regarding

excavations and protecting the woodland edge during the works around the gas holders (See Section 5).

As all suitable badger habitat will be retained, no impacts are anticipated during operation.

4.5.4 Great Crested Newts

Great crested newts are protected under the Habitats Regulations (2012) and the Wildlife and Countryside

Act 1981 (as amended).

As described above there are three waterbodies within the WRC itself. These were constructed as part of

the development at the Sludge treatment Centre (STC) in 2008. These are shallow and designed as

soakaways, receiving rain run-off from the areas of hard-standing. They are likely to be dry for a large

proportion of the year (TN7 and TN8, the third waterbody is 200m away and out of the survey area). There

are no further waterbodies within 500m of the proposed development. There are no previous records of

great crested newt within 1km.



15

It is extremely unlikely that great crested newts would have colonised these three water bodies in the last 5

years when there are no nearby ponds. Therefore great crested newts are not considered to be a

constraint to the proposed development.

Great crested newts are of international conservation importance

4.5.5 Reptiles

All reptiles are protected in the UK under the Wildlife and Countryside Act 1981 (as amended) against

killing and injuring. They are also priority species listed on Section 41 of the NERC Act 2006.

As part of the work undertaken at the STC in 2008, Mott MacDonald undertook a reptile survey of the

proposed area in 2006 (Mott MacDonald, 2006). One grass snake was recorded and a reptile relocation

programme was undertaken during 2007. There are previous records of grass snake and slow worm

(Anguis fragilis) within 1km.

It can be assumed that small numbers of reptiles are present around the site where suitable habitat exists.

However no suitable habitat is present within the proposed development area.

Reptiles are considered to be of county conservation importance. However they are unlikely to be present

within the proposed development area and impacts during construction and operation are unlikely.



16

5.1 Further surveys

The desk study and field survey undertaken provide adequate information on the ecological baseline and

no further surveys are warranted.

5.2 Mitigation

5.2.1 Habitats

As part of the proposed development, all existing trees at the site will be retained. During construction the

trees in the wooded edge in the vicinity of the existing gas holders will be protected in accordance with

BS:5837: 2012 (Trees in relation to design construction and demolition).

5.2.2 Breeding birds

If works to trees adjacent to the wooded area is required during the breeding season (March-August), an

Ecologist will visit the site no more than 48 hours before works commence to check the area for active

nests. If a nest is found a suitable buffer zone will be erected around the nest (normally 5-10m but this will

depend on the species) and no works will be permitted in this area until any chicks have fledged.

As there are species such as pied wagtail on site (which are known for nesting on manmade

structures/inside pipes etc.) all plant and equipment will be carefully stored to reduce (as far as possible)

potential for the creation of suitable nesting sites. Such measures will include the following:

� Plugging the end of any stored pipe-work; and

� Not leaving plant standing in the same location for extended periods of time.

If a nest is found on any plant or equipment an Ecologist will be contacted. If the nest is active the plant or

equipment will not be moved until any chicks have fledged.

5.2.3 Badgers

As badgers are known to be present in the vicinity the following measures will be implemented during

construction:

� A toolbox talk will be given to all site personnel on badgers, notifying them that they are present on site

in the close vicinity and may be foraging around the construction areas at night;

� Any excavations deeper than 0.5m will be covered at night or a way of egress provided to prevent a

badger becoming trapped (e.g. propping a plank up the side of the excavation);

� Avoid vegetation removal directly in front of the retaining wall (i.e. the area between the two gas

holders) in order to keep the area under cover;

� Erect demarcation fencing (for example Heras) along the woodland edges to prevent site staff from

entering the woodland, ensuring the habitat as a whole is not damaged or disturbed (see drawing and

further information in the Planning Statement); and

5 Mitigation and Enhancement



17

� The contractor will include badger protection measures onto the site hazard plans, Construction

Environmental Management Plan (CEMP) and any other relevant documents.

5.2.4 Bats

Where possible, good practice guidance will be followed. As detailed in Bats and Lighting the UK (Bat

Conservation Trust, 2008) the lighting will consider the following:

� Installation of lighting at the lowest practicable height;

� Lowest practicable strength of light is used;

� All lighting is angled downwards;

� Hoods or cowls are fitted to reduce light-spill; and

� Illuminating linear edges will be avoided where bats may be foraging such as woodland edges or

hedgerows.

5.3 Enhancement

5.3.1 Breeding birds

Enhancements for breeding birds will be provided by the installation of ten bird boxes, to be sited in the

woodland to the west of the existing gas holders. The following box types will be used:

� 5no 28mm holed boxes erected on trees, suitable for blue tit (Cyanistes caeruleus); and

� 5no 32mm holed boxes erected on trees, suitable for great tit (Parus major).

Bird boxes will be situated in semi-mature or mature trees which are large enough to support the weight of

the box (i.e. trees with a diameter greater than 150mm at chest height) and at a height of 2-3 m so they are

inaccessible.

Bird boxes will be positioned in sheltered positions facing between north and south-east, to avoid wet

winds and midday sun. Boxes will be secured to the tree using stainless steel screws and can be further

secured using wire or a strap.

The bird boxes will be untreated and will come from a sustainable wood source (Forest Stewardship

Council certified).

5.3.2 Bats

Enhancement measures for bats will include the erection of five bat boxes within the existing trees within

the woodland adjacent to the existing gas holders.

Bat boxes will be sited on mature/semi-mature trees large enough to support their weight (i.e. trunk larger

than 150mm at chest height) and will be sited facing south at least 5m above ground – preferably as high

as possible. The area around the box should be clear of overhanging branches or wires so bats can easily

fly in.



18

The bat boxes will be suitable for Pipistrelle bats such as the double crevice bat box pictured below. The

materials and colour of the box mean it warms up more quickly and stays warm for longer.

Figure 5.1: Example double crevice bat box

Source: www.batboxes.co.uk

Boxes will be secured to the tree using stainless steel screws and can be further secured using wire or a

strap.



19

This desk study and Extended Phase 1 Habitat Survey concludes that the proposed development area is

of negligible ecological value.

As badgers are known to be foraging in the area mitigation will be implemented during construction. The

mitigation will minimise any risk of badgers being affected by the proposed development and ensure they

are protected during construction work.

Mitigation measures incorporated into the proposed development will include the following:

� Protection of trees from damage during construction; and

� The careful design of lighting (both temporary and permanent) to minimise disturbance to bats.

The following enhancement measures will be undertaken:

� 5no 28mm holed boxes erected on trees at WRC site;

� 5no 32mm holed boxes erected on trees at WRC site; and

� 5no bat boxes erected within the existing trees at the WRC site.

6 Conclusion



20

� Bat Conservation Trust (2008) Bats and the Built Environment Series: Bats and Lighting in the UK

� Chartered Institute of Environmental Assessment (1995). Guidelines for Baseline ecological

assessment. Institute of Environmental Assessment. E & FN Spon, London.

� Chartered Institute of Ecology and Environmental Management (IEEM) (2006). Guidelines for

Ecological Impact Assessment in the United Kingdom (version 7 July 2006). Available online at

www.ieem.org.uk/ecia/index.html

� DfT (2004). The Biodiversity Sub-Objective: TAG Unit 3.3.10. Transport Analysis Guidance (TAG),

Department for Transport.

� Eaton, MA, Brown, AF, Musgrove, AJ, Hearn, R, Aebischer, NJ, Gibbons, DW, Evans A & Gregory, RD

(2009). Birds of Conservation Concern 3: the population status of birds in the United Kingdom, Channel

Islands and Isle of Man. British Birds 102, pp 296-341.

� Joint Nature Conservation Council (2010). Handbook for Phase 1 Habitat Survey – a Technique for

Environmental Audit. JNCC Publications, Peterborough.

� Mott MacDonald (2006) Biosolids Quality Sub-Program – Great Billing New Biosolids Treatment Centre

– Reptile Survey.

� National Planning Policy Framework (2012). Department for Communities and Local Government.

� Stace, C.S. (2010). New Flora of the British Isles. 3rd Edition. Cambridge University Press, Cambridge

7 References



21

Appendices 21

Appendix A. Target Notes ______________________________________________________________________ 22 Appendix B. Phase 1 Habitat Map _______________________________________________________________ 25

Appendices



22

Target note Description Photograph

1 Semi-natural broadleaved woodland dominated by sycamore and ash. As large number of

sycamore saplings have colonised the gravel area at the edge of the woodland between the

existing digesters and the woodland.

2 Small brick retaining wall with a concrete/ceramic pipe leading into a small

bund. Located approx 3m inside the woodland. There is no other end to the pipe visible. No

spoil pile but some loose material in front of the pipe with badger hairs. Well used badger latrine

2m away.

3 Fresh badger latrine just inside woodland edge. No photograph

Appendix A. Target Notes



23


4 The construction compound will be located on an area of amenity grassland and hard standing

to the south of the woodland.

5 Gravel area which has been colonised by tall ruderal vegetation and sycamore saplings.



24


6 Approximately 8 holes within woodland, likely to be a former badger sett which has been

disused for some time. Entrances are either collapsed or filled with leaves, two have

evidence of rabbit use.

7 Soakaway area constructed as part of the works undertaken at the site in 2008. Area wet

in places at time of survey but likely to be dry most of the year. Low banks have unmown

rough grass surrounded by amenity grassland. Some marginal vegetation comprising soft rush.

8 Soakaway areas constructed as part of the works undertaken at the site in 2008. Area was dry and has been colonised by rough grassland

and tall ruderal vegetation.

No photograph



25

Appendix B. Phase 1 Habitat Map

8

7

6

5

4

3

21

Great BillingPhase 1 habitat map

Drawing Title

© Mott MacDonald Ltd.This document is issued for the party which commissioned it and for specific purposes connected with the captioned project only. It should not be relied upon by any other party or used for any other purpose.We accept no responsibil ity for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to use by other parties.

Reference Drawings

INF

P1

Notes

AMP 5 Biosolids ProgrammeAdvanced Digestion

Target NotesTemporary protective barrierin accordance with BS 5837:2012Survey areaStanding waterHard standingTall ruderalAmenity GrasslandSemi-natural broadleaved woodlandBuilding (Existing)

0 25 50m

Legend

1

1:1,250

Project title

Demeter HouseStation RoadCambridge, CB1 2RSUnited KingdomT +44 (0)1223 463 500F +44 (0)1223 461007W www.mottmac.com

SEW-09683-GBILST-2G-PLG-0418-RevA.pdfAWS Drawing No. Rev

StatusMM Project No.Scale2795591:1,250@ A3

GIS File

RevFor Information LCP1 12/11/13

Date Description Drawn Design'd Chk'd App'dAV LHLD

1. This drawing is to be in conjunction with all relevant drawings andsupporting documentation.

2. Layout prepared from As Built drawings, survey drawings and reference to aerial photographs

This plan is produced by Anglian Water Services Limited, from Ordnance Survey © Crown Copyright - 100018507,This map is to be used for the purposes of viewing the location of Anglian Water plant only. Any other use of the mapdata or further copies are not permitted. This notice is not intended to exclude or restrict l iability for death or personalinjury resulting from negligence.

SEW-09863-GBILST-2G-PLG-403 - Proposed Digester Plant LayoutSEW-09863-GBILST-2G-PLG-410 - Proposed CHP Plant layout

SEW-09683-GBILST-2G-PLG-0418

The location of the protective barrier is indicative only and that exact alignmentis to be agreed onsite prior.

great billing stc biosolids resilience scheme (sew-09683)€¦ · a toolbox talk will be given to...

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