51 bridge road east welwyn garden city ecological …

51 BRIDGE ROAD EAST

WELWYN GARDEN CITY

ECOLOGICAL METHOD

STATEMENT

Written By: LG

Checked By: NJ

Date: 07/08/2018

Document File Ref: TWNT20946_EMS

Revision: A – 06.11.18

CONTENTS

1.0 INTRODUCTION AND CONTEXT 1

2.0 SITE CLEARANCE AND DEMOLITION 3

3.0 PROTECTION/ AVOIDANCE MEASURES DURING CONSTRUCTION 7

4.0 TIMETABLE FOR IMPLEMENTATION – DEMOLITION/ CLEARANCE 9

5.0 PERSONS RESPONSIBLE 10

6.0 MANAGEMENT AND MAINTENANCE 11

7.0 ECOLOGICAL ENHANCEMENTS 16

APPENDIX 1 TREE PROTECTION PLAN

APPENDIX 2 SOFT LANDSCAPE AND ECOLOGICAL ENHANCEMENTS PLAN

Ecological Method Statement 51 BRIDGE ROAD EAST, WELWYN GARDEN CITY

ACD Environmental 1

1.0 INTRODUCTION AND CONTEXT

1.1 This Ecological Method Statement (EMS) has been written to satisfy Condition 5 of

the planning permission (6/2017/2104/MAJ, Welwyn Hatfield Borough Council) for

the approved development as follows:

“No development shall take place (including any demolition, ground works, site

clearance) until a method statement for all recommendations listed with the

[Ecological Impact Assessment (ACD Environmental, August 2017)] has been

submitted to and approved in writing by the local planning authority.

The content of the method statement shall include the:

a) purpose and objectives for the proposed works;

b) detailed design(s) and/or working method(s) necessary to achieve stated

objectives (including, where relevant, type and source of materials to be used);

c) extent and location of proposed works shown on appropriate scale maps and

plans;

d) timetable for implementation, demonstrating that works are aligned with the

proposed phasing of construction;

e) persons responsible for implementing the works;

f) initial aftercare and long-term maintenance (where relevant);

g) disposal of any wastes arising from works.

The works shall be carried out strictly in accordance with the approved details and

shall be retained in that manner thereafter.

REASON: To protect ecology in accordance with NPPF 2012, and Policy R11 of the

Local Plan 2005”

1.2 The site comprises a brownfield site containing a large office building surrounded

by a hardstanding car park. There are margins of improved grassland and semi

mature trees around the site perimeter and small areas of introduced scrub and

improved grassland within the car park.


ACD Environmental 2

Sensitive Ecological Features

1.3 The sensitive ecological features at the site are summarised as follows:

Bats - a single common pipistrelle Pipistrellus pipistrellus bat was recorded

emerging from the south eastern elevation of the building from behind

concrete cladding near the top of the building on two occasions in May and

June 2017. The site is being registered under the Bat Low Impact Class

Licence (BLICL) prior to demolition;

Nesting Birds - potential for birds to nest on the flat roof of the building, in the

plant room and in vegetation throughout the site; and

Trees - oak Quercus robur, wild cherry Prunus avium, Norway maple Acer

platanoides, sycamore A. pseudoplatanus, whitebeam Sorbus aria, lime Tilia

sp., crack willow Salix fragilis and silver birch Betula pendula are present

within the grassland margins, which form the southern, western and part of

the eastern and northern boundaries.

Purpose and Objectives

1.4 The purpose of this method statement is to protect ecology in accordance with the

National Planning Policy Framework (NPPF) 20181, and Policy R11 of the Welwyn

Hatfield District Local Plan 2005.

1.5 This method statement gives site contractors details of the measures that must be

taken to avoid breaching wildlife legislation.

1 https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/728643/Revised_NPPF_2018.pdf


ACD Environmental 3

2.0 SITE CLEARANCE AND DEMOLITION

Building Demolition

2.1 The Application Site will be registered under the BLICL and the area of the building

that has been used by a bat will be demolished legally in November 2018. This

timescale is not in line with the recommendations contained within the EcIA Report,

as the construction programme has been pushed back. However, demolition can

still proceed as per the methodology detailed below.

2.2 To avoid the very low potential for impacting torpid bats, demolition will take place

only when overnight temperatures are above 5oC. The feature that has been used

by a bat will be thoroughly checked with an endoscope by the BLICL Registered

Consultant or an Accredited Agent, immediately prior to demolition. A cherry picker

or similar will be used to access the feature from the outside. If at this stage a bat is

found to be present, if possible, it will be extracted by hand and placed in a bat box,

which will be erected on a tree within the Application Site. Alternatively, the ecologist

will wait until the bat has emerged and the feature will be made inaccessible to bats.

The exact methodology will be decided on and implemented by the BLICL registered

ecologist. Once a bat is confirmed not to be present, the concrete slab will be

removed on the same day or rendered inaccessible to bats in the intervening time

to demolition.

Photograph 1: Bat emergence location on south eastern elevation of building.


ACD Environmental 4

2.3 The loss of bat roosting features within the Application Site will be compensated for

through the provision of a Schwegler 2F bat box, which will be available for the

BLICL Registered Consultant to move a bat into, if and when required during

demolition. The box will be erected on a retained tree. Two Habibat bat boxes will

be integrated into the fabric of the new buildings. These bat boxes will be installed

on south-east/west facing elevations of the buildings, over 4m in height and out of

all direct artificial light. The boxes should be positioned close to dark corridors and

areas of open space to provide safe flight lines for bats to access the boxes.

Grassland

2.4 Small areas of the grassland around the Application Site are going to be impacted

by construction traffic.

2.5 The grass banks around the building are being retained. These banks have an

abundance of rabbit Oryctolagus cuniculus holes, which will not be directly impacted

by the ground works on site. Rabbits are protected from cruelty under the Animal

Welfare Act 2006 and the Wild Mammals Protection Act 1996 and are also protected

under sections of the WCA 1981 (as amended), namely under sections relating to

protection of other animals and prevention of poaching. If works are likely to impact

these holes, any rabbits that may be present must be dealt with humanely, i.e. slowly

removing topsoil so the rabbits have time to move into surrounding areas.

2.6 There is very low potential to impact small numbers of common amphibian species

that might be present within the grassland. During clearance of any grassland, soil

stripping should proceed slowly using a phased approach to give amphibians time

to move into surrounding habitats.

2.7 There is very low potential for small numbers of reptiles to be present within the

areas of longer, tussocky grassland around the perimeter of the site. The majority

of these areas are being retained; however, small areas may need to be cleared.

When minor clearance is required, the grass should be cut when reptiles are likely

to be fully active i.e. between April - September period, to make the areas unsuitable

for reptiles. Cutting should be undertaken in a phased way over two consecutive

days to a height of no less that 200mm as the first cut and 100mm at the second

cut. Following the removal of taller vegetation, the grass should be maintained at a


ACD Environmental 5

height of 100mm through regular mowing or strimming to discourage reptiles from

returning.

2.8 Much of the existing grassland around the perimeter of the site will be retained and

enhanced with species rich amenity grass seed. Areas of grassland that need to be

cleared will be replaced with good quality amenity grass turves laid in line with good

horticultural practices.

2.9 The stripping, storage and re-use of top soil shall be carried out in accordance with

BS 4428:1989 and BS 3882:2007. Additional guidance is provided by Defra in its

‘Construction Code of Practice for the Sustainable Use of Soils on Construction

Sites2’.

Tree/ Scrub Clearance

2.10 The majority of the existing semi mature trees are being retained and protected from

the development. Two category C trees are proposed for removal to make room for

a pedestrian footpath. Root Protection Zones (RPZs) will be established around all

of the retained trees prior to the start of works and fencing will be used to protect

them from construction traffic.

2.11 To ensure damage does not occur to trees highlighted for retention, tree protection

fencing must be erected before any plant/vehicles entering the site whatsoever. This

should be subject to a pre-commencement site meeting between the developer and

the project arboriculturist. Full details of the tree protection are shown on the Tree

Protection Plan (ACD Environmental ref: TWNT20946-03A) in Appendix 1.

2.12 The trees will be retained as part of a grassland/ tree matrix around the perimeter

of the development, which will be sensitively managed for wildlife.

2.13 The clearance of trees and scrub should be undertaken outside the bird nesting

season (generally taken to be March to August inclusive). If vegetation removal must

be undertaken during the bird nesting, the area must be checked in advance by an

ecologist for the presence of nesting birds. If there is no evidence of nesting birds,

2 https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/716510/pb13298-code-of-practice-090910.pdf


ACD Environmental 6

the clearance work must be completed within 48 hours of inspection. If any active

nests are identified, vegetation clearance must cease and an appropriate buffer

zone (usually approximately 5m) must remain until it has been confirmed that the

young have fledged and the nest is no longer in use.

2.14 The majority of the introduced scrub within the car park will be removed. As the

diversity of species is low and comprises mainly of ornamental, non-native species

their loss will be mitigated for by the inclusion of areas of wildlife friendly planting

within the development. Species such as heather Calluna vulgaris and bell heather

Erica cinerea should be used within flower beds within the site to enhance the site

for pollinators. Holly Ilex aquifolium, guelder rose Viburnum opulus, lavender

Lavandula sp., and apple blossom Malus sp. are recommended to be used within

the development to increase the amount of fruit and nectar bearing plant species

within the site for birds and bees in particular.


ACD Environmental 7

3.0 PROTECTION/ AVOIDANCE MEASURES DURING CONSTRUCTION

3.1 Good practice activities should be adopted during the construction phase. These

include:

Temporary lighting during the construction phase will be minimised to task

related lighting only and where feasible, works will be undertaken during

normal working daylight hours to prevent the need for lighting. No artificial

lighting will be left on at the site outside of working hours;

Where security lighting is required it is recommended that it is motion sensitive

with hooded luminaires and directed away from the vegetated boundaries;

If the schedule of works are to be amended to include the use of lighting not in

line with the recommended security lighting above, the Ecological Clerk of

Works (ECoW) will be consulted prior to installing lighting on site. Where

proposed lighting provisions are deemed unsuitable from an ecological

perspective the ECoW will work alongside the lighting engineer for the

provision of alternative lighting solutions;

Trenches will be covered at the end of the working day;

Any temporary pipes will be capped to prevent animals gaining access during

the night; and

If any signs of badger Meles meles sett excavation are encountered on site at

any time during demolition or construction, the advice of an ecologist should

be sought.

3.2 Pollution prevention guidance notes and publications produced previously by the

Environment Agency are currently subject to review in an attempt by the government

to simplify and streamline the guidance provided. Pollution Prevention Guidelines

(PPGs)3 are currently archived on the National Archives website and represent the

most up-to-date good practice guidance notes.

3

http://webarchive.nationalarchives.gov.uk/20140328090931/http://www.environmentagency.gov.uk/business/topics/pollution/39083.aspx


ACD Environmental 8

3.3 Therefore, measures to prevent pollution incidents will follow the recommendations

set out in the Environment Agency’s PPGs. It will be the responsibility of the site

manager to ensure that any site contractors are aware of the measures to be

implemented to prevent and deal with any pollution incidents.

3.4 The site should be adequately protected by secure perimeter fencing with a

padlocked front gate to reduce the potential incidents attributed to vandalism and

theft. In addition, emergency out of hours contact numbers should be clearly

displayed at the site entrance.

3.5 It will be the responsibility of the site manager to ensure that:

i) All fuel and chemical storage is sited on an impervious base within a secured

impervious bund;

ii) Refuelling of mobile vehicles is undertaken in a designated area, on an

impermeable surface and away from any drains or watercourses;

iii) Diesel pumps or similar equipment are placed on drip trays to collect any

minor spillages; and

iv) Drip trays are checked at least weekly and any accumulated oil removed for

disposal.

3.6 It will be the responsibility of the site manager to ensure that all wheel washes and

plant washing facilities used are securely constructed with no overflow and the

effluent is contained for proper treatment and disposal. The site contractor will also

be responsible for ensuring that all site roads are regularly brushed or scraped and

kept free from dust and mud deposits. In dry weather dust suppression measures

will be used.


ACD Environmental 9

4.0 TIMETABLE FOR IMPLEMENTATION - DEMOLITION/ CLEARANCE

Optimal

Sub-optimal – additional precautions required

Unsuitable

Table 1: Ecological constraints to demolition/ vegetation clearance.

Au

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Se

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No

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Dec

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b

Ma

r

Ap

r

Ma

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Ju

n

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l

Demolition

of

Building

BLICL would require modification

No demolition BLICL would require modification

Clearance

of trees

and scrub

Requires check by ecologist for nesting birds before clearance

Clearance

of

grassland

Grass to be cleared should be made unsuitable for reptiles in April - Sept


ACD Environmental 10

5.0 PERSONS RESPONSIBLE

5.1 At the time of writing, it is anticipated that the following parties will be responsible

for implementing the EMS.

5.2 The developer and their appointed principal site contractor will be responsible for:

a) Compliance with legal consents relating to nature conservation;

b) Compliance with planning conditions relating to nature conservation;

c) Installation of physical protection measures during construction

d) Implementation of sensitive working practices during construction; and

e) Regular inspection and maintenance of physical protection measures and

monitoring of working practices during construction.

5.3 Contact Details

Developer: Taylor Wimpey North Thames

Principal Contractor: ………………………………………

Details to be confirmed upon appointment.

Ecological Clerk of Works

5.4 The appointed ECoW will be responsible for provision of training and information to

all construction personnel on site about the importance of 'Ecological Protection

Zones'. The ECoW will also supervise relevant pre-construction works as required,

including vegetation/site clearance, reptile mitigation as per the relevant reptile

mitigation method statement, to ensure no harm to legally protected species occurs.



6.0 MANAGEMENT AND MAINTENANCE

6.1 Following installation and after transfer the landscape shall be the responsibility of

and maintained in perpetuity by:

Domestic Owners; and

Taylor Wimpey and their appointed Management Companies (should these

be contracted out).

6.2 Refer to ACD drawing; TWNT20946 Soft Landscape Proposals in Appendix 2 for

planting and grassland locations.

6.3 The Developer shall ensure that any landscape contractor employed by the

developer shall carry out the periodic maintenance of all planted areas, other than

any areas for which the appointed Management Company becomes responsible

during the said Maintenance Period. Inspection checks shall be carried out at

monthly intervals and the appropriate work carried out.

6.4 The Developer shall ensure that any landscape contractor employed by the

developer shall carry out in all areas any shrub, tree, grass and other plants

replacements that may be necessary until transfer of responsibility to the

Management Company.

6.5 The Management Company shall be responsible for all periodic maintenance and

replacement thereafter for all planted areas to which its management agreement

relates, and shall ensure that any landscape contractor employed by it carries out

periodic maintenance of all such areas in accordance with the general horticultural

schedules below. Either inspection checks shall be carried out by a competent

person, a member of British Association of Landscape Industries (BALI) or the

Landscape Institute (LI), acting for the Management Company, at minimum monthly

intervals and the appropriate work carried out.

Trees

6.6 All works should be undertaken in accordance with the British Standard

BS3998:2010 Tree Work Recommendations, by recognised tree contracting

companies from the Arboricultural Association's list of registered contractors. Proof



of experience and insurance provision will be required. All work shall be undertaken

at the appropriate time and with the consent of the Management Company.

6.7 The Arboricultural Impact Assessment and Method Statement produced by ACD

Environmental Ltd (Ref: TWNT20946_AIA_RevC) will be followed. All operations

will be carefully carried out to avoid damage to the trees being treated, or

neighbouring trees. No trees to be retained shall be used for anchorage or winching

purposes.

6.8 The trees should be checked annually for signs of deterioration or distress and the

appropriate actions taken, where a potential safety hazard is identified.

6.9 Norway maple Acer platanoides is considered invasive in the absence of

management, therefore if seedlings and saplings are found within areas of

grassland, they should be pulled out by hand.

Grass

6.10 Areas directly to the front and flat areas of rear gardens to the new properties will

be laid to an amenity grade turf. This is due to the potential for heavy use by the

new occupants.

6.11 Grass shall be cut during the growing season (generally April - October) using a

sharp cutter to leave about 30-35mm of growth and remove arisings from site.

6.12 Grass will be cut at intervals of not more than 10-14 days depending on growing

conditions. Arisings shall be collected and removed from site. A dressing of

prepared fine fishmeal shall be applied at the rate of 60gms/m squared after the

second mowing and the arisings of the cut following are to be allowed to fly.

6.13 Grassed edges to planted areas to be trimmed to maintain a clear smooth edge to

planted beds; strim edges elsewhere but not against trees; spike annually in

October.

6.14 Should bare patches of grass develop, area is to be cultivated to 150mm and then

seeded with amenity grass seed. To be cross-sown in two directions at right angles

to each other (half the seed being used in each direction) at the rate of 35 gm per

square meter and the ground lightly raked over on a still dry day when the top 25mm



of soil is dry.

6.15 Grassland to receive different maintenance regimes. Refer to ACD Environmental

Ltd Soft Landscape proposals for grassland mix locations. Wear and Tear amenity

grass seed mix A24 to be maintained as amenity grassland and cut at 10-14 day

intervals.

General

Grassed areas beyond the boundaries of domestic ownership will be maintained

in perpetuity by the Management Company.

Weekly

All plants shall be watered following 10 days without rain. Then weekly until

natural rainfall during June - August.

Fortnightly

Amenity Grass to be cut every 10-14 days.

Fortnightly litter pick over the entire site within areas covered by the Management

Company.

Monthly

Weed control shall be allowed for at monthly intervals. All areas to be weeded by

hand.

All plants shall be inspected monthly for wind firmness and firmed as necessary

at the same time. Stakes shall likewise be checked for firmness and tree ties

checked.

Bi-Annual

The bark mulch should be topped up bi-annually.

Grass cutting to Wildflower areas.

After two years tree stakes and ties are usually ready to be removed.



Annual

Replacement of any failed trees or shrubs will be allowed for annually to ensure

that the planting areas are fully stocked at all times.

Any hollows which appear due to settlement shall be top dressed annually, early

in the growing season.

Minor pruning of dead or damaged wood shall be allowed for annually.

All planted areas and trees shall be given an application of an approved top

dressing in May. Not in Wildflower areas.

Shrubs shall be maintained in a balanced shape and prevented from obscuring

signs, windows and encroaching on paths.

Every 5 Years

A suitably qualified person employed by the Management Company to undertake

a review of the condition, success and long-term maintenance of the planting.

Any amendments to the landscape management plan required to ensure a good

planting scheme should be submitted to the LPA for approval. The LPA may draw

the managing company’s attention to defects in the maintenance or failure to

comply with the landscape management plan and require that the Management

Company rectify these defects or apply for a variation to the landscape

management plan.



Table 2: Implementation checklist

Task When Tick when completed

Notes Name Date Sign

Grass seeding

March - May 2020

Tree planting November- March 2019

Not in waterlogged ground

Not in drought conditions

Not in frost

Shrub planting

April 2020 - August 2020

Bird and bat box installation

Tree boxes during construction

Building boxes as dwellings are built, prior to occupation

Hedgehog

Erinaceus europaeus -friendly fence installation

As dwellings are built



7.0 ECOLOGICAL ENHANCEMENTS

7.1 The NPPF states that plans should ‘minimise impacts on and provide net gains for

biodiversity’4. The following enhancements will be installed within the site prior to

occupation. Locations of artificial habitats are shown in Appendix 2.

7.2 The Application Site will be enhanced for breeding birds by the provision of bird

boxes within the development. At least five bird boxes will be erected on trees and

buildings in north to north-easterly elevations at a height of 2-5m above ground level.

Recommended bird boxes include: 2 x 3S Schwegler Starling Nest Boxes, 2 x 1SP

Schwegler Sparrow Terrace and 1 x 2H Schwegler Robin Box.

7.3 Two HH7 Hogilo Hedgehog boxes will be provided within boundary habitats. The

boxes will be located within cover, close to vegetation and out of the prevailing wind.

7.4 Fences will include features to allow the movement of wildlife between gardens by

either raising close board fencing above the ground or by cutting small holes cut in

the fencing gravel boards allowing continued access for small wildlife such as

hedgehogs.

4 https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/728643/Revised_NPPF_2018.pdf

APPENDIX 1 TREE PROTECTION PLAN

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8

3

.

5

9

83.8

7

83.71

83.82

8

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9

8

3

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0

83.9

5

8

3

.

4

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8

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9

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7

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5

8

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6

6

83.65

8

3

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8

2

8

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6

0

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7

0

8

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5

1

8

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5

4

8

3

.

7

3

8

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4

8

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9

8

3

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0

83.47

83.49

83.54

83.75

83.57

83.67

83.61

83.52

8

3

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6

8

3

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9

83.64

83.52

8

3

.

3

5

8

3

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4

7

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7

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1

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5

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8

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4

4

8

3

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6

8

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3

5

8

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58

3

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7

3

8

3

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7

6

8

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6

9

8

3

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7

4

8

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6

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8

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7

5

8

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7

6

8

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7

7

8

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7

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83.85

8

3

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5

6

8

3

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5

7

8

3

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5

7

8

3

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6

0

83.65

83.49

8

3

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4

8

3

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8

8

3

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2

8

3

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6

8

3

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1

8

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8

3

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8

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1

83.11

8

3

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5

8

3

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6

8

3

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7

8

3

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4

83.22

83.17

8

3

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6

8

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8

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7

8

2

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9

7

8

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0

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83.02

83.06

8

2

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8

3

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8

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1

8

2

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6

8

3

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0

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8

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8

3

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8

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83.18

8

3

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8

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5

83.01

8

3

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3

8

3

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4

8

3

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1

82.93

82.59

82.21

82.28

82.16

82.11

81.98

81.89

81.97

82.07

8

1

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1

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8

1

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2

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8

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9

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9

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79.94

80.05

80.07

79.94

79.88

79.91

80.01

79.88

79.86

79.81

7

9

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8

9

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9

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0

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81.77

81.66

81.36

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2

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80.03

82.18

82.22

83.16

83.06

83.44

83.48

83.69

83.86

83.73

83.72

83.92

83.49

83.40

83.32

83.33

83.18

83.09

83.18

82.63

82.54

83.18

83.57

83.52

83.27

83.49

8

3

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8

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83.0

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81.0

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8

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8

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7

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83.73

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58

3

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1

8

3

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3

8

3

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8

8

3

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8

8

3

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5

82.9

82.89

8

2

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8

8

2

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6

8

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6

8

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8

8

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7

8

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82.9

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8

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4

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4

1

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1

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2

2

8

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2

GY

82.2

8

2

.

2

2

8

2

.

2

6

8

2

.

2

4

82.21

B

T

B

T

82.46

82.55

82.57

82.69

82.82

82.83

82.76

82.73

82.03

82.1

82.73

82.76

GP

GP

8

2

.

5

4

8

2

.

5

6

8

2

.

6

8

2

.

1

9

8

1

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9

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8

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7

7

8

1

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7

2

8

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5

6

8

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7

2

8

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8

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9

8

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5

1

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5

5

8

2

.

4

5

8

2

.

4

3

8

2

.

4

2

8

2

.

5

6

MH FW

CL 82.44

8

2

.

6

7

8

2

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5

9

8

2

.

6

6

8

2

.

5

5

8

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7

2

8

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9

8

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5

8

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82.76

82.69

82.57

82.47

82.26

82.59

82.55

82.47

82.43

82.07

82.09

82.14

8

2

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1

6

8

2

.

0

7

8

2

.

0

5

8

1

.

9

7

GY 81.85

GY 82

GY 81.85

MH SW

CL 81.85

GY 81.99

R

S

8

2

.

1

8

8

2

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1

1

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6

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9

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81.86

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9

4

8

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79.95

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80.06

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82.23

81.78

80.76

79.92

79.94

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7

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IL 79.48

IL 80.62

p

i

p

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f

i

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e

d

t

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d

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79.77

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0

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0

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l i n

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f e

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k

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0

0

m

iron ra

ilings ht 2

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s

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t

2

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0

0

m

t a r m a c

t a r m a c

t

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p

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s

shrubbery

f o l i a g e

g

r

a

s

s

g r a s s

g

r

a

s

s

g r a s s

g

r

a

s

s

f o

l i a

g

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b

i

n

c

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m

p

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d

b

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c

h

c

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re

te

h

t

8

5

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4

c

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n

c

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p

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t

a

n

d

r

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l

f

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c

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t

0

.

5

m

G

Y

a

c

u

a

c

u

Tree protection limited

to extent of existing

soft landscape

Crown reduce T21:

retain spread of 3.5m

and height of 7m

T1 - B1

Common Oak

T2 - B1

Common Oak

T3 - C1

Wild Cherry

T4 - C1

Norway Maple

T5 - C1

Oriental Plane

T6 - C1

Whitebeam

T7 - B1

Swedish Whitebeam

T8 - B1

Swedish Whitebeam

T9 - C1

Wild Cherry

T10 - B1

Sycamore

T11 - C1

Wild Cherry

T12 - B1

Lime

T13 - B1

Lime

T14 - B1

Lime

T15 - C1

Lime

T16 - B1

Wild Cherry

G17 - U

Crack Willow, Silver Birch

T18 - C1

Whitebeam

T19 - B1

Sycamore

T20 - B1

Norway Maple

T21 - B1

Norway Maple

T22 - C1

Hornbeam

Poor quality self-seeded

boundary vegetation. No

protection required

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NEIGHBOURING NORTON BUILDING

BORDERING THE NORTH EAST BOUNDARY

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(ISABEL HOSPICE)

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Communal green amenity

spaces - 662m²

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BLOCK A

(3-storeys)

Green amenity

space - 108m²

BLOCK C

(4-storeys)

BLOCK D

(3-storeys)

BLOCK B

(4-storeys)

VEHICLE REPAIR

CENTRE

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Pedestrian

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Date Details Drawn

drawn: checked:dwg no:

scale:

drawing:date:

scheme:

May 2017

AJB

51 Bridge Road East,Welwyn Garden City

Tree Protection Plan

1:200@A1

MW

Rev

client: Taylor Wimpey

AC

D

Copyright of ACD. All rights described in Chapter IV of the Copyright, Designs andPatents Act 1988 have been generally asserted: 2015. Copyright of this plan remains

with ACD until all fees have been paid in full.

The original of this drawing was

produced in colour- a monochrome

copy should not be relied upon.

TWNT20946-03A

0 1 2 3 4 5 10m

TREE TO BE REMOVED

ROOT PROTECTION AREA (RPA) FOR RETAINED TREES

A CATEGORY TREE

B CATEGORY TREE

C CATEGORY TREE

U CATEGORY TREE

INDICATIVE SERVICE ROUTE AVOIDING PROTECTION AREAS

EXISTING SITE FEATURES

Foot traffic Scaffolding

Protective

fencing

Ground undisturbed and protected by geotextile

fabric , woodchip and side-butting scaffold boards

Protected

area

Platform level

at first lift of

brickwork

Protected

area

Protective

fencing

For pedestrian movements only, a single thickness of scaffold boards should be placed either

on top of a driven scaffold frame, so as to form a suspended walkway, or on top of a

compression-resistant layer (e.g. 100 mm depth of woodchip), laid onto a geotextile.

For pedestrian operated plant up to a gross weight of 2 t, proprietary, inter-linked ground

protection boards should be placed on top of a compression-resistant layer (e.g. 150 mm depth

of woodchip), laid onto a geotextile.

For wheeled or tracked construction traffic exceeding 2 t gross weight, an alternative system

(e.g. pre-cast reinforced concrete slabs) should be employed to an engineering specification

designed in conjunction with arboricultural advice to accommodate the likely loading to which it

will be subjected.

CONSTRUCTION EXCLUSION ZONE

Root protection areas (RPA) of retained trees within which all construction activity is restricted.

All trees that are being retained on site must be protected by barriers and/or ground protection

before any materials or machinery are brought onto the site, and before any demolition,

development or stripping of soil commences. Where all activity can be excluded from the RPA,

vertical barriers must be erected to create a construction exclusion zone. Where, due to site

constraints, construction activity cannot be fully or permanently excluded in this manner from all

or part of a tree’s RPA, appropriate ground protection can be installed.

DEFAULT POSITION FOR THE TREE PROTECTION BARRIERS.

BS5837:2012 Figure 2- barrier specification

GROUND PROTECTION

Where the set-back of the tree protection barrier would expose unmade ground to construction

damage, new temporary ground protection should be installed as part of the implementation of

physical tree protection measures prior to work starting on site.

Examples of alternative barrier designs can be found in the method statement. Should an

alternative design be more viable and appropriate, it must be agreed with the project

arboriculturist before its implementation.

1 Standard scaffold poles

2 Heavy gauge 2m tall galvanized tube and weld mesh infill panels

3 Panels secured to uprights and cross-members with wire ties

4 Ground level

5 Uprights driven into the ground until secure (minimum depth 0.6m)

6 Standard scaffold clamps

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RESTRICTIONS WITHIN TREE PROTECTION AREAS

Inside the exclusion area of the fencing, the following shall apply:

· No mechanical excavation whatsoever

· No excavation by any other means without

arboricultural site supervision

· No hand digging without a written method statement

having first been approved by the project

arboriculturist.

· No lowering of levels for any purpose (except

removal of grass sward using hand tools)

· No storage of plant or materials

· No storage or handling of any chemical including

cement washings

· No vehicular access

· No fire lighting

In addition to the above, further precautions are necessary

adjacent to trees:

· No substances injurious to tree health, including

fuels, oil, bitumen, cement (including cement

washings), builders sand, concrete mixing and other

chemicals shall be stored or used within or directly

adjacent to the protection areas of retained trees

· No fire shall be lit such that flames come within 5m

of tree foliage.

WHY TREE PROTECTION IS NEEDED

1) Soil compaction kills roots- caused by plant

movement and storage of materials within

protected areas.

2) Trenching severs roots- many small roots

grow within the top 600mm of soil. Even the

removal of the top 200mm can cause damage.

3) Soil pollution kills roots- Dripping fuel storage

or cement washings can contaminate the soil

resulting in root death.

4) Raising & lowering levels kills roots- the soil

used to increase levels can compact the

underlying soil (see point 1). Lowering levels will

remove roots causing damage to the tree.

5) Bark and branch damage- bark removal and

branch damage can allow disease and fungi into

the tree.

The impact of any of the above can take years

to show- trees can have huge reserves of food

and water.

WimpeyTaylor

16.01.2018 Revised layout MWA

NO-DIG SURFACE

Cellular confinement system (CCS) to be used to create this area of hard

surface, above the existing ground level. Topsoil to be retained. Depth of

CCS to be 50-75mm for pedestrian surfaces and 100-200 for vehicular

surfaces. Surface to be porous to approved details and specifications. To

be installed under arboricultural supervision. All specifications subject

to engineering design.

Original ground

level level

Peg and board edging

Top soil to

BS3882:2007

Depressions

and soft spots in

formation to be

filled with sharp

sand to levels

required

Porous surface to finish

TreeTex T300 non-woven geotextile or

similar approved laid over formation

CCS/Cellular

confinement system

(Geosynthetics CellWeb

or similar approved)

Cells to be filled with 20-40mm clean graded angular

stone to manufacturers details and specifications

TreeTex T300 geotextile or similar laid over CellWeb

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NEW PEDESTRIAN REFUGE

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NEW TACTILE PAVING PEDESTRIAN CROSSING

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EXISTING VISIBILITY SPLAYS TO BE MAINTAINED DUE TOUTILISING EXISTING ACCESS

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GRASS VERGE

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EXISTING RIGHT TURN LANETO BE MAINTAINED

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HEAD OFFICERodbourne Rail Business Centre, Grange Lane, Malmesbury, SN16 0ESTel: 01666 825646Courtyard House, Mill Lane, Godalming, GU7 1EYTel: 01483 425714Suite 6, Crescent House, Yonge Close, Eastleigh, SO50 9SXTel: 02382 0263009 Brownlow Road, Cambridge, CB4 3NGTel: 07825 868654

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ENVIRONMENTAL

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bush

APPENDIX 2 SOFT LANDSCAPE AND ECOLOGICAL ENHANCEMENTS PLAN

109No Buxus sempervirens 'Rotundifolia'

87No Ligustrum ovalifolium

5No Chaenomeles superba

6No Aucuba japonica 'Rozannie'

4No Lavandula angustifolia 'Hidcote'

4No Sarcococca humilis

6No Euonymus fortunei 'Emerald Gaiety'

10No Skimmia japonica 'Rubella'

5No Choisya 'Aztec Pearl'

9No Hebe albicans 'Red Edge'



20No Elaeagnus ebbingei



14No Genista lydia





6No Philadelphus 'Belle Etoile'







13No Aucuba japonica 'Rozannie'

12No Genista lydia

12NoFuchsia 'Margaret'


15No Viburnum burkwoodii 'Anne Russell'










20No Genista lydia






16No Photinia fraseri 'Little Red Robin'


11No Escallonia 'Apple Blossom'



198No Carpinus betulus










19No Viburnum opulus


7No Pittosporum tenuifol. 'Golf Ball'



8No Lonicera nitida 'Baggesen's Gold'

9No Hebe rakaiensis

7NoHebe rakaiensis

8No Carex testacea 'Old Gold'


9No Euonymus europaeus


17No Hebe rakaiensis


1No Acer campestre 'Streetwise'

6No Euonymus europaeus



1No Amelanchier 'Ballerina'

10No Weigela 'Mont Blanc'



2No Carpinus betulus 'Frans Fontaine'



457No Narcissus 'Tete a Tete'





11No Genista lydia











3No Prunus sargentii 'Rancho'





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61 BRIDGE ROAD EAST (ISABEL HOSPICE)

VEHICLE REPAIR CENTRE

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13NoFuchsia 'Margaret'

6No Hebe rakaiensis






9No Hebe pinguifolia 'Pagei'








8No Genista lydia



10No Abelia grandiflora 'Francis Mason'

10No Genista lydia


6No Clematis armandii 'Apple Blossom'






2No Sorbus aucuparia



15NoEuonymus fortunei 'Emerald Gaiety'




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5No Hebe rakaiensis






6No Fuchsia 'Margaret'



7No Genista lydia


4No Fuchsia 'Margaret'






















18No Genista lydia




Dimension of tree pit to be at least

75mm greater then the rootball. The

depth of the pit shall be no deeper

than the existing rootball and

container depth

Root Rain Metro tree pit irrigation

system, or similar

Backfill material to comprise of soil

dug from excavated pits (if of

sufficient quality) or to be backfilled

with 600mm subsoil and 300mm of

topsoil, in line with BS3882:2015

Specification for topsoil

1m diameter of decorative bark

mulch to be applied to surface of tree

pit, to a depth of 75mm

Base of tree pit to remain

undisturbed unless there is evidence

of poor drainage, soil smearing or

panning in which case appropriate

rectification measures will be

required

Backfill material is be be applied in

layers 150mm in depth, ensuring that

the tree is held upright

The root flare of the newly planted

tree shall be clearly visible at the soil

surface and is not to be buried by

excess soil or mulch

Stakes to be requisite length,

pressure impregnated, debarked

softwood 100mm square or diameter,

driven into ground sufficient depth to

provide full support

Once tree has been positioned the

hessian and twine surrounding the

roots is to be loosened. Wire cages

are to be removed

Tree ties to be expandable rubber

with spacer block, fixed to stake with

heavy duty galvanised nails

Tree Pit Detail: Soft Landscape

Components as supplied from GreenBlue Urban or similar

Legend

Existing trees to be retained and

protected during construction

Proposed specimen shrub planting to

receive short angular staking on half

standards with expandable tree ties.

Irrigation tubing to root system of

Amelanchier and Juniperus specimens as

required

Proposed shrub planting to receive 75mm

bark mulch after planting operations

Proposed grass areas to receive good

quality amenity grass turves laid in line with

good horticultural practices

Proposed bulb planting within grassed

areas, to be planted to a depth 3x size of

the bulb in Autumn

Proposed climbing plants to be trained up

adjacent wall/ fence/pergola with

galvanised wires and hook set 250mm

apart with support canes removed prior to

planting

Proposed Buxus (box) hedge planting to

be planted in a single row at 300mm

centres. To be maintained at 0.6m height

Proposed tree planting within soft

landscape. See detail 2 on sheet xxx

Proposed Carpinus (hornbeam) hedge

planting to be planted in a double

staggered row 400mm apart and at

400mm centres in each row. To be

maintained at 1.2m height

1272No32/m²Grade 12/14Narcissus 'Tete a Tete'

No.DensitySpecificationSpecies Name

Bulbs

31No4/m²2LCarex testacea 'Old Gold'

No.DensitySpecificationPot SizeHeightSpecies Name

Herbaceous

6NoCountedSeveral Shoots :Caned5-7.5L80-100cmClematis armandii 'Apple Blossom'


Climbers

10No4/m²Bushy5L40-60cmWeigela 'Mont Blanc'

19No4/m²Bushy5L40-60cmViburnum opulus

39No4/m²Bushy5L40-60cmViburnum burkwoodii 'Anne Russell'

212No4/m²Bushy5L40-60cmSkimmia japonica 'Rubella'

143No4/m²Bushy5L40-60cmSarcococca humilis

25No4/m²Bushy5L40-60cmPittosporum tenuifol. 'Golf Ball'

16No4/m²Bushy5L40-60cmPhotinia fraseri 'Little Red Robin'

157No4/m²Bushy5L40-60cmPhiladelphus 'Belle Etoile'

35No4/m²Bushy5L40-60cmLonicera nitida 'Baggesen's Gold'

320No0.3Ctr Double Staggered at 0.3m offsetBranched :C5-7.5L60-80cmLigustrum ovalifolium

107No4/m²Bushy :C5L30-40cmLavandula angustifolia 'Hidcote'

69No4/m²Bushy5L40-60cmHebe rakaiensis

25No4/m²Bushy :C5L30-40cmHebe pinguifolia 'Pagei'

100No4/m²Bushy5L40-60cmHebe albicans 'Red Edge'

100No4/m²Bushy :C5-7.5L40-60cmGenista lydia

35No4/m²Bushy5-7.5L40-60cmFuchsia 'Margaret'

116No4/m²Bushy5L30-40cmEuonymus fortunei 'Emerald Gaiety'

15No4/m²Bushy5L40-60cmEuonymus europaeus

43No4/m²Bushy5L40-60cmEscallonia 'Apple Blossom'

20No0.4Ctr Double Staggered at 0.4m offsetBranched :C :To be planted and maintained as a hedge5-7.5L60-80cmElaeagnus ebbingei

40No4/m²Branched :C :To be planted and maintained as a hedge5-7.5L60-80cmElaeagnus ebbingei

33No4/m²Bushy5L40-60cmChoisya 'Aztec Pearl'

69No4/m²Branched5L40-60cmChaenomeles superba

464No0.5Ctr Double Staggered at 0.3m offsetBranched :C5-7.5L60-80cmCarpinus betulus

729No0.3Ctr Double Staggered at 0.3m offsetBushy :C :Planted and maintained as a hedge5-7.5L30-40cmBuxus sempervirens 'Rotundifolia'

19No4/m²Bushy5L40-60cmAucuba japonica 'Rozannie'

1NoCountedBushy :C25-35L175-200cmAmelanchier 'Ballerina'

10No4/m²Bushy5L40-60cmAbelia grandiflora 'Francis Mason'


Shrubs

3NoSemi-mature :Clear Stem min. 200 :RBCountedmin. 450cm20-25cmAcer campestre 'Streetwise'

4NoSemi-mature :Clear Stem min. 200 :RBCountedmin. 450cm20-25cmCarpinus betulus 'Frans Fontaine'

2NoExtra Heavy Standard :Clear Stem min. 200 :RBCounted425-600cm14-16cmCarpinus betulus 'Frans Fontaine'

2NoExtra Heavy Standard :Clear Stem min. 200 :RBCounted425-600cm14-16cmSorbus aucuparia

4NoHeavy Standard :Clear Stem min. 200 :RBCounted425-600cm14-16cmAcer campestre 'Streetwise'

9NoHeavy Standard :Clear Stem min. 200 :RBCounted350-425cm12-14cmPrunus sargentii 'Rancho'

No.SpecificationDensityHeightGirthSpecies Name

Trees

Planting Schedule

Proposed 1.2m high bow top fencing in

black, supplied by Jackson Fencing or

similar

Proposed 1.8m high close boarded fencing,

supplied by Jackson Fencing or similar

2No 3S Schwegler Starling Nest Box

2No 1SP Schwegler Sparrow Terrace

1No 2H Schwegler Robin Box

2No HH7 Hedgehog Hogilo Box

2No Habibat integrated Bat Boxes

Proposed 0.8m high close bow top fencing

in black, supplied by Jackson Fencing or

similar

Proposed wildflower and grass areas to

receive seed mix WRG4 Neutral Soils at a

sowing rate of 5g/m² on prepared ground in

line with good horticultural practices

SPECIFICATION

All works generally, to comply with the written Soft

Landscape Specification.

NOTE: DO NOT SCALE FROM DRAWING

Date Details Drawn

May 2017

HCS

51 Bridge Road East,

Welwyn Garden City

Landscape Proposals

1:200@A1

TWNT 20946 11E

ALK

Rev

Taylor Wimpey North Thames

AC

D

drawn: checked:

drawing no:

scale:

drawing:

date:

scheme:

Copyright of ACD Environmental Ltd. All rights described in

Chapter IV of the Copyright, Designs and Patents Act 1988

have been generally asserted: 2011. Copyright of this plan

remains with ACD until all fees have been paid in full.

client:

HEAD OFFICE

Rodbourne Rail Business Centre, Grange Lane,

Malmesbury, SN16 0ES

Tel: 01666 825646

Courtyard House, Mill Lane, Godalming, GU7 1EY

Tel: 01483 425714

Suite 6, Crescent House, Yonge Close, Eastleigh, SO50 9SX

Tel: 02382 026300

9 Brownlow Road, Cambridge, CB4 3NG

Tel: 07825 868654

email: [email protected]

www.acdenvironmental.co.uk

ENVIRONMENTAL

06.09.17 Layout revision ALKA

16.01.18 Layout revision ALKB

08.08.18 Layout revision and eco enhancements HCSC

13.08.18 Layout revision (external works) HCSD

17.08.18 Client Comments HCSE

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2x660x44mm LEAF, 1400mm STR. OPEN

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Head Office

Rodbourne Rail Business Centre Grange Lane Malmesbury SN16 0ES

Tel: 01666 825646

Surrey Office Courtyard House

Mill Lane Godalming GU7 1EY

Tel: 01483 425714

Hampshire Office Suite 6

Crescent House Yonge Close

Eastleigh SO50 9SX

Tel: 02382 026300

Cambridgeshire Office 9 Brownlow Road

Cambridge CB4 3NG

Tel: 07825 868654

Email: [email protected] Website: www.acdenvironmental.co.uk

ECOLOGICAL SURVEYS * PROTECTED SPECIES LICENSING * MITIGATION * IMPACT ASSESSMENT ARBORICULTURAL SITE MONITORING AND SUPERVISION * ARCHAEOLOGY

LANDSCAPE & VISUAL IMPACT ASSESSMENT * LANDSCAPE AUDIT * PROJECT MANAGEMENT EXPERT WITNESS* LANDSCAPE DESIGN & PLANNING LANDSCAPE MANAGEMENT

mailto:[email protected]

http://www.acdenvironmental.co.uk/

51 bridge road east welwyn garden city ecological …

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