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ARBORICULTURAL ASSESSENT AND
METHOD STATEMENT FOR SITE WORKS
Compliant with BS5837: 2012 ‘Trees in relation to design, demolition
and construction – Recommendations’.
Report Ref. GW-WR-AMS REV A
Revision Date. 13th July 2020
Author. Gulliver’s World Ltd
“Warrington’s first and only woodland leisure resort!”
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 2 of 26
1. INTRODUCTION
1.1 This document is an Arboricultural Assessment and Arboricultural Method Statement (AMS).
1.2 The purpose of this report is to summarise the findings of an arboricultural assessment of the
existing vegetation at the application sites. This report describes the locations of and
categorises trees which may be affected by the development and describes the existing site
conditions. It then assesses the potential impact of the proposed development on existing
trees before presenting a strategy for the avoidance of harm to the highest extent possible.
1.3 The method statement component of this report explains what actions will be taken to help
ensure the health of trees on the site which are to be retained as part of the development.
Particular consideration is given to the formation of parking areas, siting of lodges/chalets and
creation of permanent structures within the planning application site.
1.4 The categorisation of the trees is based on a tree survey conducted in accordance with the
guidelines contained within BS5837: 2012 ‘Trees in relation to design, demolition and
construction – Recommendations’. This assessment and the development plans have been
devised having regard to an up-to-date tree constraints plan and a site topographical survey
which has been produced to reflect the conditions and levels on the application site.
1.5 The report follows the following structure:
Chapter Description Page
1 Introduction 2
2 Baseline and background information 3
3 Tree survey results 5
4 Description of proposed development 6
5 Discussion (removals, retention and replacements) 9
6 General tree protection measures 12
7 Specific Arboricultural methods for the development site 14
8 Conclusions 18
Appendix A – Tree survey details and categorisation 19
Appendix B – Cross Section detail for concrete pads 24
Appendix C – Method statement for piled foundations 25
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 3 of 26
2. BASELINE AND BACKGROUND INFORMATION
2.1 The existing site conditions are described fully within the Rachel Hacking Ecology
Supplementary report (June 2020) submitted within the planning application. The site is an
area of managed woodland adjacent to the Gulliver’s World Theme Park resort.
2.2 In the area of land closest to the existing theme park, there are areas of cleared tracks and
hardstanding, storage of machine parts and theme park rides and spares as well as a
forestry management building approved by the Council under application ref. 2016/29502.
2.3 The land is managed in accordance with a Forestry Commission approved Woodland
Management Plan (report ref. Liz Sharkey Forestry, 2015). The parcel of land subject to the
planning applications is identified for 30% thinning of existing tree stock to allow
established specimens to thrive and provide improved ground level biodiversity habitats.
2.4 The application site was previously open agricultural pastoral and parkland, with some
interspersed specimen trees. This is confirmed by the 1891-1905 OS maps for the area as
can be seen from the map extract below. It remained as such until the 1980’s.
Extract from OS Map (site locations edged red)
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 4 of 26
2.5 The trees within the application site range in age from young to mature, with a few trees
which are veteran. However, the vast majority are of a semi-mature age class, with a large
proportion of self-set low quality trees. The site was absent of any notable tree cover
throughout the majority of the 20th century as can be seen from the 1969 map extract below:
2.6 In the main, the woodland within the application site is mixed deciduous some of which has
characteristics of wet woodland. The woodlands are located on flat ground and lie at 10m
above sea level on sandy and loamy soils which are naturally wet and very acidic.
2.7 Species include Common Ash, Common Alder, Silver Birch, Goat & Grey Willow, Horse
Chestnut, Norway Maple, Rowan, Sycamore and Oak. The predominant species are Oak and
Willow species. There is no Tree Preservation Order in force and the site is not within a
Conservation Area. The site is managed under a FC approved management plan (2015).
2.8 It is noted that several individual trees and groups have structural or physiological defects.
In total, five trees and two groups have been recommended for further investigations, due
to their age and characteristics and for the presence of Ash dieback. The defects observed
may lead to their early demise or make them unsafe in the future. Where attempts are
made for such trees to be retained, they shall be re-inspected as part of the routine
management of the land and as addressed as part of the overall management of the site.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 5 of 26
3. TREE CONDITION SURVEY RESULTS
3.1 The assessed retention category of a tree offers an indication of overall value. The category
of each item is listed at Appendix A. As a general rule, trees listed as retention category ‘A’ or
‘B’ are the most valuable items and as such, their retention is desirable. Efforts should be
made to retain these within the development plans wherever possible. Items listed as
retention category ‘C’ are of lesser value and their removal and/or replacement is less likely
to be considered contentious and should not represent a constraint to construction. Items
listed as retention category ‘U’ are recommended for removal regardless of any proposals.
3.2 The location of each tree is plotted on the associated Tree Constraints Plan This plan
identifies the retention category of each tree:
Retention A = green canopy
Retention B = blue canopy
Retention C= grey canopy
Proposed removals= Outline red (cross refer to Appendix C for categorisation)
The crown spread, and also the associated rooting zone (Root Protection Area [RPA]) are
shown as dotted black outlines on the plans.
3.3 The survey revealed a total of 36 items of vegetation (14 individual trees, 21 groups of trees
and 1 woodland). Of these, 5 trees were identified as retention category ‘A’; 4 trees, 5
groups and 1 woodland group were identified as retention category ‘B’; and 5 trees and 16
groups as retention category ‘C’. See plan refs. EA-5410-001 and EA-5410-001 for the
constraints and layouts, and the table at Appendix A detailing their categorisations.
3.4 T6, T7, T8, T9, T10, G24 and G36 were noted to have significant structural or physiological
defects, as detailed at Appendix A. Although these trees were considered to be in a broadly
acceptable condition at the time of the inspection, the defects observed may lead to their
early demise or render them unsafe in the future. As such, these trees will be re-inspected
and assessed as per the recommended schedule to assess if their condition is still deemed
acceptable to be retained in the development as it progresses (as advised at Appendix A).
3.5 Some tree removal will be necessary to facilitate development and ash dieback
(Hymenoscyphus fraxineus) is present, which may necessitate future removals. The design
should be optimised to retain as many higher quality specimens (retention category ‘A’ and
‘B’) as possible. Many of the lower quality trees (retention category ‘C’) could be removed
and replaced as part of a post development landscaping scheme. Retention of veteran trees
should be considered mandatory and will usually enhance any proposed development.
3.6 Trees to be retained will require protective measures to be implemented. Such measures are
discussed in the Method Statement and should typically entail temporary protective fencing,
installed to the full extent of the RPA. Where this is not entirely possible, ground protection
may also comprise part of the protective measures. This includes a compaction reducing
construction detail which enables a degree of construction traffic over/within the RPA.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 6 of 26
4. PROPOSED DEVELOPMENT
4.1 Access to the site is made by foot and by road from the existing private driveway off
Shackleton Close which leads east, then south into the parking areas. The main theme park
and attractions are situated in the south and south-east portion of the application site, with
the Burtonwood Heritage museum, Splash Zone swimming pools and Nerf Zone attractions
being located immediately adjacent to the car parks.
4.2 The proposals are for the siting of up to 67no. woodland lodges as part of a wider Woodland
Resort complex including a Spa, Camping/caravan ground, Pet Resort and new Staff HQ.
Group accommodation for Scouts/Guides and similar user groups will be offered alongside a
woodland activity zone set within the existing treescape. The proposals also include creating
parking areas and cycle storage for guests and staff. The proposal would generate
£5.5million net beneficial economic impact, with an additional £1.2million GVA annually.
4.3 The proposed development comprises:
Accommodation
o Siting of up to 67no. Lodges, static caravans and timber chalets
o Siting of 5no. organised Group Accommodation (double unit lodges)
o Provision of 11no. touring caravan /camping pitches
Ancillary Buildings:
o Facilities building inc. toilets for camp ground, 300 m2
o Pet Resort (day-stay and overnight), 500 m2
o Staff HQ Building and welcome suite, 300 m2
o Spa suite, relaxation and treatment rooms, 258 m2
o Covered cycle parking area for circa 25-30 bikes
Additional components of the development
o Car parking spaces, hard and soft landscaping
o Surface water attenuation pond
o Ecological improvement areas
o Hard and soft landscaping
4.4 The planning applications are accompanied by comprehensive reports on technical matters
relevant to arboriculture as follows:
a) Covering letter by County Planning Ltd (13th July 2020)
b) Ecological survey (Rachel Hacking Ecology Ltd, June 2020)
c) Ecological Management Plan (report ref.GW-WR-EMP, March 2020)
d) Himalayan Balsam management and eradication programme (Gulliver’s, March 2020)
e) Woodland Management Plan (report ref. Liz Sharkey Forestry, 2015)
f) Preliminary Ecological Assessment and Bat Scoping report ref (JCA Ref: 15211/DB).
4.5 Other reports provided include highways; noise and land quality; trees; & drainage. These
are outside the scope of this report and are not considered further.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 7 of 26
Fig.1 - Extract from site plan for supporting development site (application ref. 2020/36670):
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 8 of 26
Fig.2 - Extract from site plan for woodland lodge development site (application ref. 2020/36760):
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 9 of 26
5. DISCUSSION – RETENTIONS, REMOVALS AND REPLACEMENTS
5.1 The majority of the root system of a tree is in the surface 600mm of the soil, extending radially
for distances frequently in excess of the trees height. Beyond the main structural roots (close
to the base of the trunk), the root system rapidly sub-divides into smaller diameter roots: off
this main system, a mass of fine roots develop. Excavations for foundations, landscaping or
service trenches can be deep enough to sever most of the roots, and it should therefore be
assumed that parts of the root system beyond the excavation would no longer serve the tree.
5.2 The parts of the root system, which are active in water and nutrient uptake, are very fine,
typically less than 0.5mm diameter. They are short lived, developing in response to the needs
of the tree, with the majority dying each winter. This provides some scope for installation of
stanchions to support fences, caravans/lodges and decking, ideally re-using holes from the
existing fencing to install new fences without causing harm to the trees.
5.3 Beyond these major roots, root growth and development is influenced by the availability of
water and nutrients. Factors that commonly adversely affect tree health after development
works have been undertaken in the vicinity of trees include:
a) Direct damage to roots, including severing roots with foundations;
b) Compaction of the ground, which reduces the space between soil particles;
c) Changing soil levels, even for only a few weeks.
d) Covering the root area with impervious surfaces.
e) Preliminary site preparation works by stripping the topsoil.
Status of the woodland
5.4 Ancient woodland is defined as an area that has been continuously wooded since 1600AD but
in this case the application sites are not ancient woodland, having been open land until the
1980s. In any event, the concept of ancient woodland being given specifically elevated status
by wrote is flawed and requires more detailed consideration, noting that it only acts as a proxy
indicator of elevated biodiversity – it thus requires specialist assessment of the conditions on
the ground. Particularly, there is no empirical or scientific basis to distinguish secondary (ie.
later woodlands) based on age alone. Biodiversity is ground condition specific and dependent.
5.5 In this instance, the supplementary ecological survey conducted by Rachel Hacking Ecology Ltd
(June 2020) notes that whilst some native species typical of shaded habitats do occur within
the woodland, they are dispersed and scattered across the site and are found as individual
stands or as a small cluster. There is an extremely dense carpet of Himalayan Balsam (invasive
plant species) with approximately 80% coverage of the woodland floor and the overall area of
woodland is species poor with no notable differential species assemblage.
5.6 In an arboricultural sense, the woodland is unremarkable. Particularly the woodland lodge site
is comprised almost entirely of category C trees, often which compete with one another for
nutrients and light; having poor forms, a-symmetrical growth and structural faults as a result.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 10 of 26
Removals and retentions
5.7 Taking into account the above factors, a schedule of removals and retentions has been devised
and is included in full at Appendix A. This identifies as follows:
o All 5no. category A and veteran trees (T6 to T10 inclusive) are to be retained and
protected as part of the development;
o With the exception of 2no. trees within G26 (comprising a group of circa 30 no. Ash.
Alder, Birch & Oak), all other category B trees are to be retained. This includes protection
and retention of G4; G15; G18; G25; G26 [28no].] G29; and G40 and retention and
protection of individual trees T12; T27; T28.
o 18no. out of a total of 94 category C trees are to be removed to facilitate the
development. This includes removal of 4no. trees within G16; 4no. (out of 6) within G25;
2no. (out of 30) within G26 and 8no. (out of 54) within G41. This equates to 80%
retention within this category. Some trimming and crown lifting is likely to be required on
the woodland lodged site to enable the lodges to be moved into position.
5.8 In total, this equals 20no. tree removals identified across the application site for the
supporting development (2020/33670), of which all but two are within retention category C.
Replacement planting
5.9 The core approach taken toward the scheme is to adopt a holistic view of the woodland
environment within the lodge site, which aims to integrate trees and groups to be retained
into the glades and rides as features of the development site. It also achieves a wider objective
to provide material and significant net biodiversity gain through the programmed eradication
of invasive plant species; and thereafter, the establishment of an emorsgate seed floral and
faunal understorey to the woodland site and a biodiverse grass and floral seed mix to the
complimentary development site. This is additional to the bat and bird boxes already offered.
5.10 Additionally, to compensate for the small number of removals (notwithstanding that a 30%
thinning of the whole woodland is already authorised by the Forestry Commission approved
Woodland Management Plan); there is a proposed native tree planting of 70no. maple, silver
birch and common oak in addition to 1,330sq.m of trees and shrubs on the mixed use site and
a woodland seed mix yielding 26,125sq.m of tree cover within the woodland lodge site.
5.11 The life expectancy of the vast majority of trees on the woodland lodge site (2020/36760) is
circa 20 years, falling within retention category C. Several groups are identified as having poor
forms and structure, such that their physiological and structural condition means that the
trees will need to be replaced if comparable degrees of canopy cover are to be achieved
beyond the 20 year time horizon. The approach to replacement planting recognises this risk of
decline in the ‘no development’ scenario. This is reaffirmed by the Liz Sharkey Forestry report.
5.12 Overall, due to the development, the application sites will receive replacement native planting
to retain a tree canopy extent of 27,500sq.m (2.745ha), in addition to the key retentions
identified. By the end the period 2080, tree canopy cover will exceed, in both quality and
quantum, that which exists now or if no action is taken as per the ‘no development scenario’.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 11 of 26
Proposed planting for the supporting site
Proposed planting for the woodland site:
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 12 of 26
6. GENERAL TREE PROTECTION MEASURES
6.1 Therefore, the following methodology has been prepared in order to help minimise and
prevent damage to the existing trees. The methodology falls into three broad categories:
o Generic precautions;
o Specific precautions;
o Specific design/methodological adjustments;
o Arboricultural Method Statement for specific developments within the site.
Generic precautions and protections
6.2 Therefore, the following generic precautions shall be taken in the carrying out of all works:
a) Oil, bitumen, cement, chemicals or other material likely to cause damage to the tree will
not be stacked or discharged within 10m of the trees;
b) Materials in general will not be stacked or discharged within the 10m of the trunk of the
trees and shall not be used as anchorage for any equipment whatsoever;
c) Concrete mixing and washing will not be carried out within 10m of any retained trees;
d) Fires shall not be lit on site;
e) Trees shall not be used as notice boards, for mounting of telephone cables, electrical
wires and no other services will be attached to any part of a retained tree.
Deliveries and storage
6.3 Delivery and handling of construction materials shall be subject to a Construction and
Environmental Management Plan which safeguards the health of trees to be retained.
6.4 The site compound, which typically includes the site office, facilities, toilets, storage of
materials and parking, is to be located away from trees and outside their RPAs. The compound
is to be sited on existing hardstanding areas which are bare of tree cover within the site.
6.5 The site compound is to be created as shown on the submitted plans and is to be constructed
first, to ensure that set down and storage areas do not have any adverse impacts on tree
health. The compound benefits from direct access to the existing hardsurfaced road via Gate E
as shown on the plans and will include a storage building and fabrication workshop.
Protective fencing
6.6 Retained trees will require adequate protective measures during development. Such measures
typically entail temporary protective fencing, installed to the full extent of the RPA. Where this
is not entirely possible, ground protection may also comprise part of the protective measures.
This includes a compaction reducing construction detail which enables a degree of
construction traffic over/within the RPA.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 13 of 26
6.7 Temporary protective fencing will be installed around trees to be retained as part of the
development and erected to the specification as illustrated below. It shall be erected prior to
the commencement of construction activities (in that phase of works) including the delivery of
materials and site facilities. Any fencing that is damaged so that it is no longer able to protect
retained trees must be replaced/repaired immediately with appropriate fencing.
Protective fencing specification:
Specific precautions
6.8 Therefore, the following specific precautions shall be taken in the carrying out of all works;
a) Hand-dig around any significant root mass discovered, avoiding the use of heavy
machinery in situations where trees are marked to be retained;
b) Avoid future parking of vehicles within unsurfaced bare root areas unless a celluar no-dig
confinement surfacing method is proposed to protect the root structure.
Specific design and methodological adjustments
6.9 The following specific precautions shall be taken in the carrying out of all works:
a) Position the new fencing by re-using the footings for the existing fences where possible;
b) Any crown lift required to facilitate the installation shall be completed having due regard
to future optimum tree health. Any lopping, pruning or trimming works required shall be
completed to the British Standard BS3998. All such works shall be undertaken by a
qualified arborist;
c) Any works shall leave adequate room from the development to the trunk of the trees to
allow for future tree growth;
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 14 of 26
7. ARBORICULTURAL METHODOLOGIES FOR THE DEVELOPMENT
7.1 The following section of the report explains the methods to be used in construction works
during the development of the site. It identifies specific areas of the site where specialist
construction techniques need to be used to ensure the longevity of trees which are desirable
to be retained as part of the development proposals.
7.2 The method statement considers the construction of the following aspects:
o Buildings within the root protection area of Category B trees
o Concrete pads for static caravans, lodges and chalets
o Car Parking Areas
o Pedestrian footways
o Internal roadways
o Fencing at the site perimeter
o Drainage infrastructure
Buildings within the root protection area of Category B trees
7.3 There shall be no removal of and no building foundations situated within the Root Protection
Area of Category A trees, all of which are to be retained as part of the development.
7.4 With regard to Category B trees, where buildings are proposed within the Root Protection
Area (RPA) of Category B trees, the building shall use pile foundations for the proportions of
the building within the RPA. In such instance, the Method Statement for piling at Appendix B
shall be adhered to and works shall be carried out under supervision of a project arborist.
7.5 This methodology is specifically only considered to be necessary for the pet resort building due
to its proximity to category B trees within G26 as shown in the extract from plan EA-5410-01:
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 15 of 26
Siting of static caravans, lodges and chalets
7.6 The accommodation to be provided within the site is pre-fabricated accommodation,
constructed off-site before being delivered to the site. The units meet the definition of a
caravan under planning legislation. The following section of the report details the
methodology to be used in forming the foundation on which the accommodation units will sit.
7.7 There are two main types and sizes of accommodation. Single units measure 4.23m x 13.1m
and double units measure 6m x 12m. There are some variations although the methods for all
units of accommodation remain similar, which is to position 4no. (1sq.m) concrete pads to
support the accommodation on their pre-fabricated base structures. The requirement is
dependent on the size of the unit, but in general it shall include one stand under each axel
stand (4 positions) and one free standing axel stand on either side of the four wheels, on the
main longitudinal chassis beams where cross-braced either side of the axle (4 positions).
7.8 The laying of 4no. small concrete foundations
with minimal excavations in this manner allows
the accommodation to be levelled and anchored
to the ground. Yet, it also allows minimal
excavations and root disturbance. The
placements shall be hand-dug and a cross-
section detail for the construction of the
concrete pads is attached at Appendix A. It
comprises of approx. 15mm of hardcore, 10mm
sand binding layer, 75mm concrete raft
waterproof membrane and screed.
Example of “Swift Foundation raft” in use:
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 16 of 26
Main car parking areas
7.9 The main car parking areas will be laid out with a positively drained tarmac central ‘avenues’
and pea gravel (permeable) parking rows as has been approved for us at Gulliver’s Valley,
Rotherham. Existing trees will be worked around and integrated as row shading features.
Lodge adjacent parking areas or roads
7.10 Selected lodges/chalets may in due course be upgraded to include parking for guests. As these
parking arrangements would be located within the RPA’s of retained trees, using normal
construction methods would likely cause root loss and injury by virtue of excavation and soil
compaction. As such these areas, if proposed, shall be constructed of a cellular no-dig solution.
7.11 This kind of geo-textile confinement system allows surfaces to be overlaid on areas which
would usually be unsuitable for excavation. When filled with a porous, no fines, free-flowing
aggregate; the system allows essential passage of air and water providing essential nutrients
to the roots. An example of such systems in use is shown below
Example of Terram Geocell in use
Image Source:©Terram
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 17 of 26
Pedestrian footways
7.12 Pedestrian footways within the Gullivers Glades resort areas will be constructed of a self-
binding gravel on shallow foundation (without timber edging boards). Coxwell self-binding
gravel sets hard and gives a lasting smooth finish suitable for most situations (including
wheelchair access) but quickly blends into the surroundings and so does not look intrusive. A
further advantage is that the surface requires only minimal excavations of approx. 200mm
(see construction detail below) and it can be more easily laid over uneven surface.
7.13 The final layout of the paths on site shall be selected having regard to tree retention. As the
woodland is comprised of acidic loamy soils, it is necessary for the chosen surfacing to be PH
neutral. For this reason, Breedon Gravel has been ruled out. In addition, it needs to be low
maintenance and as such Hoggin is an alternative option, commonly used around national
trust properties. However, it is more prone to rutting on gradients and when worn, larger
stones can create a bumpy surface which is difficult for cyclists, pram and wheelchair users.
Example of typical construction methodology cross section:
Image Source:©Terram
7.14 The provision of internal roadways for use on the site, if required, will be subject to a separate
planning application. Full details will be provided within the planning submission in due course.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 18 of 26
Drainage
7.15 The precise details of the drainage infrastructure of the site, including the dimension and
location of pipes as well as the gradient, size and depth of the surface water attenuation pond
are subject to detailed design calculations after approval of planning permission.
7.16 In drawing up the design, regard should be had to the requirement to ensure retention and
long-term tree health for trees likely to be affected by any of the works. This Method
Statement shall be updated to give effect to those requirements.
7.17 The precise details of this aspect of the development can be subject to a condition.
Fencing around the site perimeter
7.18 There already exists 1.8m high fencing around the perimeter of the site. It is expected this may
need to be replaced in some areas of the site in order to improve security or as part of on-
going maintenance of the site. In such instance, where trees could be affected, we will:
• Position the new fence by re-using the footings for the existing fence;
• Any crown lift required to facilitate the installation shall be completed having due
regard to future optimum tree health; and
• Leave adequate room from fence to the trunk of the trees to allow for tree growth.
8. CONCLUSIONS
8.1 The development will use open ground, rides and glades within the woodland environment to
create a woodland themed leisure resort, characterised by outdoor activities and free-standing
lodge accommodation set within a woodland environment. Critical to that ambition is creating
and maintaining a woodland environment which is compatible with the development aims.
8.2 This report has described the existing woodland environment and explained the methods to
be used in construction works during the development on the site. It identifies specific areas
of the site where specialist construction techniques need to be used to ensure retention of
trees which are favourable specimens or groups worthy of retention. It also identifies where
further information or actions such as the erection of protective fencing may be needed
before site works commence.
8.3 All category A and veteran trees will be retained. All but 2no. category B trees will be retained.
A total of 18no. category C removals will be compensated for by a generous and long-term
planting strategy which promotes woodland tree cover across circa 2.75ha of the application
site. This is in addition to native tree planting of 70no. maple, silver birch and common oak.
This will ensure the establishment of a significant tree canopy across the development site.
8.4 In conclusion, this assessment has demonstrated that the proposed development can be
carried out in compliance with the guidance in BS 5837:2012. Moreover, that the proposal is
acceptable in terms of its arboricultural impacts and treescape considerations.
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 19 of 26
APPENDIX A - Retentions and removals schedule
Tree
Ref.
Hei
gh
t (m
)
Cro
wn
Hei
gh
t (m
)
Hei
gh
t (m
) an
d D
irec
tio
n
of
the
Lo
wes
t B
ran
ch
Dia
met
er (
cm)
Crown
Spread
Observations
Ph
ysi
olo
gic
al C
on
dit
ion
Str
uct
ura
l
Co
nd
itio
n
Am
enit
y V
alu
e
NH
BC
Wat
er D
eman
d
Lif
e E
xp
ecta
ncy
(yrs
)
Ret
enti
on
Cat
ego
ry
Ret
ain
or
Rem
ov
e as
par
t
of
pro
po
sed
wo
rks?
Age
Common
Name N
Botanical
Name W E
S
W 1
Semi mature
to early
mature
to
12 2
2 Av.
25 See plan
Predominantly even aged wet woodland; species include Ash,
Alder, Cherry, Silver Birch, Downy Birch, Hawthorn, Goat &
Grey Willows and Oak. Willows dominate the majority of this
woodland, and are of multi-stemmed form. Occasionally small
stands of single stemmed Birch and Alder were encountered
along with linear rows of planted Oaks. Five mature/veteran
trees noted along northern boundary bordering the ditch (see
plan). Some failed trees with frequent deadwood, both standing
and aerially; many with poor form and some structural defects.
GOOD FAIR MOD
LOW
to
HIGH
20+ B 2
3 All trees in group retained
Mixed
Details in
observations n/a
T 2
Mature
10 3 3
5
x
Av.
30
4 Multi-stemmed from ground level with decay fungi (Polyporus
squamosus) at the bases. Cavity with a good formation of
wound wood at 4m (north) has low bat roost potential.
FAIR POOR LOW HIGH 10+ C 1 Tree retained Goat Willow 5 5
Salix caprea n/a 5
T 3
Mature
11 2 2
65
53
56
6 Three stemmed from ground level with a balanced crown and
good vigour. Minor decay at base and deadwood observed in
lower canopy.
GOOD FAIR LOW HIGH 20+ C 1
Tree retained
Management required. Goat Willow 6 6
Salix caprea n/a 6
G 4
Semi mature
to
9 2
3 Av.
25 See plan
Approx. 15 in group; all single stemmed with good vigour and
no significant defects visible. GOOD GOOD LOW HIGH 40+ B
1
2
3
All trees in group retained English Oak
Quercus robur n/a
G 5
Semi mature
to
12 5
5 Av.
30 See plan
Majority multi-stemmed from ground level with slender forms
and high canopies. No major visible defects. GOOD GOOD LOW MOD 20+ C
1
2
All trees in group retained Common
Alder
Alnus glutinosa n/a
T 6 Veteran 16 8 3 100+ 9 Woodland canopy hindered a full aerial inspection. Single
stemmed with an asymmetric crown containing major limb GOOD FAIR MOD HIGH 40+ A
2
3 Tree retained
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 20 of 26
English Oak 2 9 loss and multiple historic broken branch wounds. Woodpecker
hole observed and features with moderate bat roost potential.
Deadwood observed. Reinspect in 6-12 months
Quercus robur NW 9
T 7
Veteran
17 8
9
96
12 Woodland canopy hindered a full aerial inspection. Single
stemmed becoming twin-stemmed 5m with a good union,
multiple historic limb losses and branch failure wounds
observed. Fruiting bodies of Inonotus hispidus found at base;
low bat roost potential. Signs of Ash dieback (Hymenoscyphus
fraxineus) noted in upper canopy.
FAIR FAIR MOD MOD 20+ A 3
Tree retained
Ash 7 2
Reinspect in 6-12 months Fraxinus
excelsior N 8
T 8
Veteran
17 3 3
95
9 Single stemmed becoming multi-stemmed from 5m with a
good union and wide canopy. Historic branch losses noted; 2
major cavities in stem at 4m. Woodpecker hole at 7 & 10m.
Features present indicate bat roost potential.
GOOD FAIR MOD MOD 40+ A 3
Tree retained
Ash 9 10 Reinspect in 6-12 months
Fraxinus
excelsior W 10
T 9
Veteran
15 7 7
88
7 Single stemmed becoming twin-stemmed at 4m with a good
union and balanced crown containing moderate sized
deadwood. A hollow stem from ground level to 2m with a
good formation of wound wood. Low bat roost potential.
FAIR FAIR MOD MOD 40+ A 3 Tree retained Ash 8 8
Fraxinus
excelsior N 8
T 10
Mature
15 8 8
79
3 A single kinked stem has a major stem wound from ground
level to 7m with a good formation of wound wood.
Internal fire damage noted.
Marginal for inclusion within category
FAIR FAIR MOD MOD 20+ A 3
Tree retained
Ash 4 7 Reinspect in 6-12 months
Fraxinus
excelsior W 8
T 12
Semi mature
8 1 1
34
6
Single stemmed with a low asymmetric crown. No significant
defects visible. GOOD GOOD MOD HIGH 40+ B 2 Tree retained
English Oak 5 4
Quercus robur n/a 1
T 13
Semi mature
7 1 1
30
4
Single stemmed with an asymmetric crown, recent broken
branch noted south-east. GOOD GOOD LOW HIGH 40+ C 1 Tree retained
English Oak 3 4
Quercus robur n/a 2
G 14
Semi mature
to
13 0
0 Av.
19 See plan Four in group; all single stemmed with high canopies. FAIR GOOD LOW LOW 20+ C 2 All trees in group retained
Silver Birch
Betula pendula n/a
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 21 of 26
G 15
Semi mature
to
9 1
1 Av.
27 See plan
Four in group forming a linear feature to rear of building.
Single stemmed with balanced crowns and no significant
defects.
GOOD GOOD LOW HIGH 40+ B
1
2
All trees in group retained English Oak
Quercus robur n/a
G 16
Semi mature
to
11 1
1 Av.
30 See plan
Six in group; 4 common Alder & 2 English Oak. All are single
stemmed with no significant defects. GOOD GOOD LOW HIGH 20+ C 2
Group removed to allow
construction of hardstand to
service and site construction
compound.
Mixed
Details in
observations n/a
G 18
Semi mature
12 3 3
55
30
30
20+20
See plan
Species include 1 multi-stemmed Goat Willow, 2 Birch and 1
twin-stemmed Alder. Merging canopies and minor deadwood
observed.
GOOD GOOD LOW
MOD
to
HIGH
20+ C
1
2
All trees in group retained Mixed
Details in
observations N
T 19
Semi mature
7.5 2 2
27
3
Single-stemmed with a balanced crown. No major visible
defects. GOOD GOOD LOW MOD 40+ C 1 Tree retained Sycamore 4 4
Acer
pseudoplatanus n/a 4
G 23
Semi mature
to
11 4
5 Av.
28 See plan
Six in group. Scattered stand of Ash & Birch.Single and twin-
stemmed with high canopies.
In an acceptable condition at present.
FAIR GOOD LOW MOD 20+ C 2
Easternmost 4no. trees in this
group of six removed to allow
construction of Welcome
Suite and Offices (and
associated access road)
Mixed
Details in
observations n/a
G 24
Semi mature
11 6 6
Av.
25 See plan
Two in group; single and multi-stemmed with sparse canopies
showing signs of ash dieback (Hymenoscyphus fraxineus). FAIR GOOD LOW MOD 10+ C 3
All trees in group retained
Ash Reinspect in 6-12 months
Fraxinus
excelsior W
G 25
Semi mature
to
10 4
4 Av.
22 See plan
Four in group. Species include oak, Goat Willow and common
Alder. Single and twin-stemmed in group bordering the larger
woodland. Crowns merge and contain deadwood. Poor forms
overall.
GOOD FAIR LOW
MOD
to
HIGH
20+ B 3 All trees in group retained Mixed
Details in
observations N
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 22 of 26
G 26
Semi mature
to
11 2
2 Av.
25 See plan
Approx. 30 in group. Species include Ash. Alder, Birch &
Oak. An even age boundary group with limited access due to
regeneration. Crowns merge and show good vitality. Minor
deadwood noted. No significant defects.
GOOD GOOD LOW
MOD
to
HIGH
20+ B 23
Significant majority of this
group to be retained. 2no.
trees along the northern edge
of group removed to allow
construction of Pet Resort.
Mixed
Details in
observations n/a
T 27
Semi mature
9 2 2 27
14
4.5
Twin-stemmed from ground level with a balanced, low
canopy. No significant defects. GOOD GOOD LOW HIGH 40+ B
1
2
Tree retained English Oak 4.5 4.5
Quercus robur n/a 5
T 28
Early mature
9 4 5
46
5
Twin-stemmed at 3m with a good union and balanced canopy.
No significant defects. GOOD GOOD LOW LOW 40+ B
1
2
Tree retained Silver Birch 4 5.5
Betula pendula N 5
G 29
Semi mature
to
10 3
3 Av.
33 See plan
Small stand of oak with single stems and merging canopies.
No significant defects noted. GOOD GOOD LOW HIGH 40+ B
1
2
3
All trees in group retained English Oak
Quercus robur n/a
T 30
Early mature
11 4 5
6
x
Av.
23
See plan Multi-stemmed from 0.6m with tight unions and a balanced
crown. GOOD FAIR LOW HIGH 20+ C 1 Tree retained
Goat Willow
Salix caprea E
G 31
Semi mature
to
10 1
2 Av.
20
up to
25
See plan
Group of even aged, mixed oak and willows. Oaks are single
stemmed with good vigour and form, Willows generally multi-
stemmed and more prolific.
GOOD GOOD LOW HIGH 20+ C
1
2
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations
Mixed
Details in
observations S
G 32
Semi to early
mature
to
12 1
2 Av.
25 See plan
Even aged mixed group of Birch and Goat/Grey Willows.
Birch are single stemmed with high canopies with willows
forming the lower canopy. Frequent multi-stemmed willow
approaching maturity with occasional failures at stem
junctions.
GOOD GOOD LOW
LOW
to
HIGH
20+ C 2
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations
Mixed
Details in
observations n/a
G 33
Semi to early
mature
11 1 2 Av.
25 See plan
Even aged group of Goat and Grey willow with multiple-
stemmed forms and minor deadwood throughout. Crowns
merge and display occasional broken branches.
GOOD FAIR LOW HIGH 20+ C 3
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations Goat Willow
Salix caprea n/a
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 23 of 26
G 34
Semi mature
11 1 1 Av.
20 See plan
Dense, generally impassable groups of Grey and Goat Willows
with merging canopies. Majority multiple stemmed with
typical forms and no significant defects.
GOOD FAIR LOW HIGH 20+ C 3
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations Goat Willow
Salix caprea n/a
G 35
Early mature
12 2 2 Av.
35 See plan
Majority are multi-stemmed with merging crowns containing
minor deadwood. Occasional older specimen with stem
failures observed.
FAIR FAIR LOW HIGH 20+ C 1
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations Goat Willow
Salix caprea n/a
G 36
Semi mature
to
10 1
2 Av.
20 See plan
Species include Ash, Birch, Willow and Hawthorn; woodland
edge understorey. Small stand of Ash saplings showing signs
of Ash dieback.
FAIR FAIR LOW
LOW
to
HIGH
20+ C 12
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations. Reinspect in 6-12
months.
Mixed
Details in
observations n/a
G 37
Semi to early
mature
10 2 2 Av.
30 See plan
All multi-stemmed with frequent included unions and merging
canopies with minor deadwood throughout. Occasional
specimen approaching maturity; stem failures noted.
GOOD FAIR LOW HIGH 20+ C 1
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations Goat Willow
Salix caprea n/a
G 38
Semi mature
11 2 2
Av.
20 See plan
Species include Alder, Birch, Hawthorn and Willows. Crowns
merge and provide opportunities for wildlife. Good
regeneration to understorey.
GOOD GOOD LOW
LOW
to
HIGH
40+ C
1
2
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations
Mixed Details in
observations n/a
G 39
Semi mature
12 1 2
Av.
20
up to
30
See plan
Woodland edge group comprising Ash, Hawthorn, Oak and
Willow as understorey. Crowns merge and contain deadwood.
No major visible defects.
GOOD GOOD LOW
MOD
to
HIGH
20+ C 1
All trees in group retained.
Proposed cabins positioned to
give priority to individual tree
locations
Mixed
Details in
observations n/a
G 40
Semi mature
to
11 2
2 25
to
30
See plan
Group of even aged, mixed oak and Birch. Oaks are single
stemmed with good vigour and forms, Birch generally twin-
stemmed with reasonable vigour.
GOOD GOOD LOW
LOW
to
HIGH
40+ B 2 All trees in group retained Mixed
Details in
observations n/a
G 41
Semi mature
to
8 1
1 #Av.
15 See plan
Young willow form dense understorey to Ash and occasional
Birch. Crowns merge and display good vigour. No significant
defects.
GOOD FAIR LOW
LOW
to
HIGH
20+ C 2
The southernmost 8no. trees
of this group of 54no. Trees
removed to enable
consrtuction of Facilities
Building and associated
hardstand
Mixed
Details in
observations n/a
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 24 of 26
APPENDIX B
Cross Section of construction detail for concrete pads
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 25 of 26
APPENDIX C
Method Statement for Piling
Where piling is to be installed near to trees, the smallest practical pile diameter should be used, as
this reduces the possibility of striking major tree roots, and reduces the size of the rig required to sink
the piles.
If a piling mat is required, this should conform to the parameters for temporary ground protection
given in item 6.2.3 of the British Standard Institute Publication ‘Trees in Relation to Design,
Demolition and Construction – Recommendations’ 2012.
Use of the smallest practical piling rig is also important where piling within the branch spread is
proposed, as this can reduce the need for access facilitation pruning. The pile type should be selected
bearing in mind the need to protect the soil and adjacent roots from the potentially toxic effects of
uncured concrete, e.g. sleeved bored pile or screw pile.
Where the design engineer is satisfied that pile and beam is acceptable, a Piling Rig will be necessary
to drive foundation piles within the RPA. The following principles must apply:
• The project arborist shall be informed of the dates of each mini pile operation in each RPA, so
that supervision can be arranged and the LPA informed.
• Piling must avoid the Mechanically Effective Root-plate Radius (MERR) of any retained tree
and this must be assessed by the Project Arboriculturalist.
• Design should allow for the free movement of air between the soil and atmosphere.
• Consideration must be given to allowing gravitational water to enter the RPA beneath any
structure where it exceeds 20% of the RPA area.
• Limit the diameter of pile excavations to 200-mm or less if possible with a minimum distance
between the centre of each pile of 1000-mm where possible.
• Piling should be undertaken with the Rig situated on top of ‘load spreaders’ able to support
the full load of the Rig without causing any soil compaction and to protect the underlying
roots from compressive injury, this protection should include tracking inwards and outwards
from the RPA.
• Consider the choice of piling rig, its working height and clearance with overhanging branches,
to avoid damaging tree branches.
• Any necessary facilitation pruning should be carried out with the approval of the LPA prior to
works commencing
• The augured excavated material shall be collected carefully and removed from the RPA
Arboricultural Assessment and Method Statement – Gulliver’s Glades, Warrington (Rev A, July 2020) Page 26 of 26
• Take precautions to prevent soil contamination, which may involve using a non-permeable
sheet below the rig during its operation to prevent leaking fuel and hydraulic oil entering the
soil.
• Spill kits should be carried and in the event of any contamination, it shall be collected
immediately and disposed of in a proper manner and the Arboriculturalist and Site Manager
informed
• When applying concrete to fill the augured holes, great care shall be taken not to spill or
contaminate the soil. In the event of spillage, then item D above shall be followed.
All works within the RPA of any retained tree should be overseen by a Project Arborist.
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