Arboricultural Method Statement - Pontypool MBTplanapps.torfaen.gov.uk/Proposed_Demolition_School_Residential... · Arboricultural Method Statement For Former Crownbridge School

Arboricultural Method Statement

For

Former Crownbridge School

Prepared By

Ref: TDA/1954/AMS/RhC/08.13

August 2013

Arboricultural Method Statement – Former Crownbridge School

_______________________________________________________________________________

Arboricultural Method Statement

For

Former Crownbridge School

On behalf of

Rio Architects

Prepared by

Tirlun Design Associates LtdCanna Studio

Llangan Vale of Glamorgan

CF35 5DR

Tel : 01446 771250Fax : 01446 448119

E-Mail: [email protected]

Document Approval

This document has been prepared and checked inaccordance with Tirlun Design Associates' quality control

system

Status: 1st Draft

Author: Mr. Rhodri Crandon

Approved: Date: August 2013

August 2013

_______________________________________________________________________________Tirlun Design Associates Ltd TDA/1954/AMS/RhC/08.13


_______________________________________________________________________________

CONTENTS

1.0 Supporting Information

1.1 INTRODUCTION

1.11 Generally

1.12 Purpose of Tree Protection Plan

1.2 METHODOLOGY

1.21 Generally

1.22 Content of Tree Protection Plan

2.0 Appendix 1

Drawing no. TDA.1954.03 - Tree Protection Plan (BS5837:2012)

3.0 Appendix 2

Protective Tree Barrier (BS5837:2012)

4.0 Appendix 3

Cellweb Confinement System



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1.0 Supporting Information



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1.1 INTRODUCTION

1.11 Generally

Trees are of vital importance to the landscape and are essential for enhancing the rural

and urban environment. They provide scenic character, visual amenity and are vital

habitats for dependent wildlife populations.

The retention of existing trees within a new development provides an immediate sense of

maturity for the benefit of a site and its surroundings, raising the overall quality of a scheme

and enhancing property value.

Trees which are damaged, or their immediate environment significantly changed by a

development, may subsequently decline and die resulting in all positive benefits being lost.

1.12 Purpose of Tree Protection Plan

The purpose of this statement/plan is to provide the developer and the appointed building

contractor (and any associated sub-contractors) with an accurate record of above and

below ground constraints presented by the existing retained trees on site together with

measures for their protection during construction operations. The Tree Protection Plan,

drawing no. TDA.1954.03 is included within Appendix 1.

The Tree Protection Plan shall be issued to selected contractors tendering for the

construction of the proposed development and will form part of the future building

contract.



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1.2 METHODOLOGY

1.21 Generally

The Pre-Development Tree Survey & Assessment and Tree Constraints Plan for the site,

document ref’s: TDA/1954/TS&A/RhC/04.13 & TDA/1854/TCP/RhC/04.13, were used to

inform the Arboricultural Method Statement and Tree Protection Plan.

1.22 Content of Tree Protection Plan

Drawing no. TDA.1954.03 has been produced in accordance with BS5837:2012 and includes:

Trees identified for retention. These trees, marked with a continuous coloured outline

representative of crown spread are identified by number and category as follows:

Category A (Green) High Quality and Value

Category B (Blue) Moderate Quality and Value

Category C (Grey) Low Quality and Value

The user of the Plan can clearly identify the merit of each tree from the drawing and, if

required, refer to the specific notes in the Tree Survey Schedule included within the

arboricultural survey

The Root Protection Area (RPA) for each retained tree based on information provided by

the arboricultural survey and drawn in accordance with BS5837:2012.

Proposed areas of ‘no-dig’ construction where hard landscape areas fall within the RPA’s

of retained trees. ‘No-dig’ will be achieved using a Cellweb confinement system (refer to

Appendix 3 for details).

The precise location and description of the protective fencing to protect the crowns and

RPA’s of retained trees. A diagram of the proposed protective fencing, as stipulated within

BS5837:2012, can be seen in Appendix 2.

Areas falling within protected areas have been marked as ‘Construction Exclusion Zones’.



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The identification of potential site compound areas for the development in order to avoid

disturbance to the protective barriers forming the ‘Construction Exclusion Zones’. The

compound areas are to be carefully laid out by the appointed main building contractor

to incorporate:

Site offices, temporary latrines and any other temporary structures.

Sufficient space for storing materials and spoil.

Sufficient space for fuel and areas for mixing cement and concrete, whether

long or short term, including means for their safe containment

On site contractor parking.

Details of 9 no. new native trees proposed along the boundary adjacent to the canal to

compensate the loss of 3no. existing trees removed as a consequence of development.

The drawing also includes an order of arboricultural works, which stipulates:

Trunk of T2 to be protected by a rigid wooden box, approximately 2.0 metres high. Box to

remain in place throughout development construction.

Existing understorey and hedgerow to the rear of plots 1-11 to be cut back to site boundary

line. Existing Sycamores to the rear of plots 12-17 to be pruned back towards the boundary

reducing crowns by 1.5m.

Any pre-development tree surgery works to be agreed with the local authority and

undertaken in accordance with BS3998:2010. Works to be undertaken by a suitably

qualified arboricultural contractor.

Protective fencing to be erected prior to any further site preparation, clearance or

development. Fencing to remain during construction operations on site.

Where construction working space or temporary construction access is justified within the

RPA's of existing trees, existing surfaces are to be left undisturbed and protected in one of

three ways:

A) For pedestrian movements only, a single thickness of scaffold boards placed either on

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



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

membrane.

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

protection boards placed on top of a compression resistant layer (eg. 150mm of

woodchip), Laid onto a geotextile membrane.

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

system (eg. proprietary systems or pre-cast reinforced concrete slabs) to an engineering

specification designed in conjunction with arboricultural advice, to accommodate the

likely loading to which it will be subjected.

All vehicle movements are to be confined to proposed compound areas where possible.

Any vehicles required in other areas (for delivery of construction materials) are to be

accompanied by designated supervisors to ensure protection of trees. Appointed

supervisors are to be briefed by the arboricultural champion.



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2.0 Appendix 1



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3.0 Appendix 2


Calculating The RPA


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4.0 Appendix 3


CellWebTTMM

CellWebTTMM Confinement Systems

CI/SfB(16.2)

Common Arrangement R12

UniclassJD40/JD41

Geosyn the t i c s

• Load support

• Erosion control

• Retaining walls

• Channel protection

• Tree root protection

CellWebTM is a three-dimensional cellular

confinement system manufactured from

high-density polyethylene (HDPE) strips that

are ultrasonically welded together to create a

strong, lightweight expandable panel.

Its unique hoop strength and interconnecting

cell walls form a durable composite mattress

that can be filled with common materials for the

most demanding load support and erosion

control applications.

As the distributor for CellWebTM in the United

Kingdom, Geosynthetics Limited can provide

next day delivery to site as standard from stock.

CellWebTM

Initially developed by the

U.S. Army Corps of Engineers

to construct unpaved roads

over weak ground, CellWebTM

dramatically improves the

performance of infill

materials across a range

of applications including:

Applications:

CellWebTM Confinement Systems

Versatile, effective andeconomical CellWebTM gives you the following benefits:

• Savings of up to 50% on infill

materials compared to other load

support systems.

• Reduces the need for excavation.

• Reduces sub base thickness.

• Simple, speedy installation saving on

construction costs.

• Environmentally friendly.

• Protection for germination on

vegetated slopes.

Product functionProduct function

Wide productrange

Large stock

holding

Next daydelivery

Please call01455 617 139or email [email protected] for further information.

Load supportProviding reinforcement to infill materials,

CellWebTM performs like a semi-rigid slab. This

effectively distributes loads laterally reducing

sub grade pressures. This means that CellWebTM

can help you to reduce the sub-base thickness

by up to 50% saving time and material costs.

Erosion control and slope stabilisationCellWebTM confines and reinforces vegetation on

steep slopes by increasing the soils natural

resistance to erosion and protects the rootzone

layer during germination. Similarly on non-

vegetated slopes it prevents the down slope

migration of granular infill resulting in greater

stability. Perforated CellWebTM panels increase

lateral drainage and reduce hydrostatic build up.

Geosynthetics Ltd is a leading dis

Millions of square meters of CellWebTM systems have been successfullyinstalled across the globe, answering many of today’s challenging technical design problems.

Design service

Onsite support

See all products online at

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Retaining wallsWhen used to construct a retaining wall,CellWebTM functions as both the faceprotection and the reinforcing element. Itsstructure confines the soil and prevents itfrom falling or being eroded, resulting in alonger life and less maintenance. CellWebTM

panels significantly increase the thickness of thewall; which in turn increases the weight of thewall and its retaining ability.

Tree root protectionBecause CellWebTM reduces the need forexcavation, this makes it ideal for stabilisingaccess roads and car parks around tree rootsystems. What’s more it reduces compactionof sub soils above the roots and promotes themigration of water and nutrients, ensuring thelong-term preservation of the tree itself.

Channel protectionCellWebTM reinforces and protects channels,riverbeds and swales by increasing the shearstrength of the selected infill. Water isdirected above the infilled cellular structure,leaving the rootzone undisturbed, providing amore attractive and cost effective solution toconcrete lined channels. In watercourses withhigh velocities a granular or concrete infill canbe used to further increase performance.

Surface

Cellweb

Geotextile

Infill

Subgrade

tributor of geosynthetic materials in the UK

Geosyn the t i c s

Quality assuranceQuality assurance

Certified qualityCellwebTM is manufactured in accordance with an ISO 9001Quality Management System with perforated walls, and acomprehensive range of cell diameters and depths. Theperforated system improves the frictional interlock of infillmaterial giving greater stability and facilitating lateral drainage.

Geosynthetics Ltd is committed to offering the bestsolutions for soil stabilisation, erosion control, drainage and environmental protection problems.

Well trained staff are always available to discuss which materials are best suited to any particular application.

Landscapearchitecture:


• Driveways

• Footpaths

• Grass car parks

• Maintenance

• Cart paths

• Slope protection

Erosion control:

• Slope protection

• Slope stabilisation

• Channel lining

• River lining

• Scour aprons

• Revetments

• Coastal protection

• Slipways

• Water crossings

• Balancing ponds

Civil engineering, construction andlandfill:

• Road/rail stabilisation

• Pipeline/sewer support

• Temporary site access

• Structural supports

• Foundations

• Car parks

• Retaining walls

• Footpaths


Geosynthetics Limited

Fleming Road, Harrowbrook Industrial EstateHinckley, Leicestershire LE10 3DU.Fax: 01455 617 140

Email: [email protected]

Please call - 01455 617 139or email [email protected] for more technical adviceand further information.

www.geosyn.co.uk

Technical specificationTechnical specification

Product Specifications

Properties Standard Cell Large cell

Material Virgin HDPE Virgin HDPE

Wall thickness 1.25mm 1.25mm

Seam welding Ultrasonic to 100% of seam length Ultrasonic to 100% of seam length

Cell depth 75, 100, 150, 200 and 300mm 75, 100, 150, 200 and 300mm

Width of expanded panel 2.56m 2.56m

Length of expanded panel 8.1m 13.72m

Cell diameter (expanded) 259 x 224mm 508 x 475mm

This brochure is produced to give an example of the products we supply and how, subject to your own testing, our products may be used.Nothing in this brochure shall be construed so as to make any ascertain or give any warranty as to the fitness for purpose of any of ourproducts in respect of any specific job. You should satisfy yourself through your own testing as to the suitability of our products for anyspecific purpose and rely solely on such testing and/or the advice of any professional(s) you commission. While we ensure as far as ispossible that all information given in this brochure is accurate at the time of print, information and examples given in this brochure are byway of illustration only and nothing contained in this or any other promotional literature produced by us shall in any way constitute an offeror contract with you or shall be relied upon by you as a statement or representation of fact.

Geosyn the t i c s

Documents

Arboricultural Method Statement - Pontypool MBTplanapps.torfaen.gov.uk/Proposed_Demolition_School_Residential... · Arboricultural Method Statement For Former Crownbridge School