tree inspection for design, demolition and construction to ... … · the information produced in...
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Tree inspection for design, demolition and construction to BS: 5837 2012
Blackburn with Darwen Borough Council Furthergate Plot 4, Blackburn
15th May 2019 by
Inspections conducted by qualified and experienced tree specialists in Arboriculture.
Arborist: Daniel Thomson, Foundation Degree in Arboriculture. [email protected] . Mob: 0742 6571 460
Contents
Brief History/ limitations Page Number 3
Introduction Page Number 3
Root protection Fence Page Number 4
Definitions on individual tree survey Page Number 5
Appendices
Individual tree Survey
Sight map with RPA (Root protection area)
2
Brief History/ limitations
I have been instructed by Blackburn with Darwen Borough council to comment upon
Plot 1 Furthergate, 13 existing individual trees, 3 groups of trees and Plot 4
Furthergate, ?? existing trees, ?? groups of trees within the proposed development
site, to provide a plan of protection for the trees to be retained on a construction site
according to the guidance laid out in BS 5837 Trees in relation to construction –
Recommendations 2012. The report is required to validate a planning application.
Measurements have been taken from the trees closest to the area of proposed
development to form a cell that complies with the British Standard. Works to the trees
may be specified but this report by Blackburn with Darwen Borough Council. No
works should be undertaken to any trees with TPO notices with out pre application
notice obtained by our arboricultural manager Russell Critchley.
The area contains a number of trees in an urban location and as the trees have formed
a natural association each individual tree is not debated in depth on an individual
basis. The purpose of this report is only to examine in detail the effect of a proposed
future development of the land on the existing vegetation during construction of the
proposed development.
The tree survey was conducted from the ground level only. Any defects in the high
crown or covering vegetation in the trees have been detected to the best of our
abilities.
Introduction
The information produced in the ‘BS 5837 Tree Survey’ by our qualified Arborists
shows the tree locations on the map layout and the root protection zones in relation to
BS 5837 2012 Trees in relation to design, demolition and construction
Recommendations. The root protection zone should clearly demonstrates how the
proposed development can be undertaken with minimal damage to the trees to be
retained, both above and below ground level. Regarding fencing round the trees intent
on retaining fig 1 picture an example of a protective barrier reducing compaction to
the roots in the demolition and or construction stage of the development.
3
Root protection fence
4
fig 1. Recommendation for root protection fencing round the tree roots
Definitions on individual tree survey
Retention category
The retention category will be documented in a table or spread sheet outlining the
trees that are worth keeping in categories A, B, C and trees under category U meaning
un-retainable. Refer to fig 2 for retention category and the meanings. Understanding
the tree quality around development will make decisions around the trees.
fig 2. Retention category
Tree number, In each table or spread sheet in the survey we include the tree number referred in the survey map,
Tree species, commonly understood English names of the tree species or
the genus of the Latin name used.
Trees height, measure with the use of trigonometry.
Trunk diameter at 1.5 meters, measured as one or multiple stems, at or close to 1.5 meters.
The crown spread of the trees, longest measurement of the crown from
the tree trunk is taken.
The crown clearance from the floor, shortest distance from the branches to the floor is taken in individual or groups of trees.
5
Age class, estimated from young, young mature, Mature or over mature.
Physical condition, describes the vigour or growth as good, average or poor.
Structural condition, describes the tree structures from roots, trunk and branches as good, average or poor.
Management recommendations, this is any recommendation to improve
the physical or structural health of the tree.
Remaining contribution of the trees life. This is a guide to the length useful contribution of the trees life. Remaining linkes in with the retention category in BS: 5837, 2012.
Retention category, refer to fig 2. This a guide to the value of the trees in the
survey, relating to BS:5837, 2012.
This data is for giving a clear picture if what you have, what you want and the best way to plan development round the existing trees on site for the best way to preserve the trees root to crow.
6
Individual tree survey Plot 4 Furthergate
Tree Number
Species Common
Name
Height
Diameter @ 1.6
RPA X 12
Diameter
Crown Spread
Crown Clear
Physical Condition
Structural Condition
Age Class
Management Recommendations
Remaining Contribution
Retention Category
1 Willow 4 0.11 1.32 2 0 Good Average Young No Recommendations 10 20 B
2 Willow 9 0.59 7.08 5 1.5 Good Average Mature Clear branches from the
fence. 10 20 B
3 Willow 11 0.21 2.52 2 3 Good Good Young
Mature No Recommendations 10 20 B
4 Willow 8 0.11 1.32 2 0 Good Good Young No Recommendations 10 20 B
5 Willow 7 0.11 1.32 2 0 Good Good Young No Recommendations 10 20 B
6
Willow
9
0.65
7.8
5
2
Good
Average
Mature
Remove the tree if the intention is to fix the
fence.
<10
C
7 Birch 5 0.07 0.84 1 0 Good Good Young No Recommendations 10 20 B
8 Willow 7 0.29 3.48 3 0 Good Good Young
Mature No Recommendations 10 20 B
9 Birch 8 0.12 1.44 2 1 Good Good Young No Recommendations 10 20 B
10 Willow 7 0.14 1.68 3 0 Good Average Young
Mature No Recommendations 10 20 B
11
Alder
7
Stem 1 0.17,
stem 2 0.10
3.24
4
1
Good
Good
Young
Mature
No Recommendations
10 20
B
12 Cherry 9 0.44 5.28 5 3 Good Good Mature Clear branches from the
fence 10 20 B
13
Alder
4
0.25
3
8
0
Good
Good
Mature
No Recommendations
<10
C
14 Willow 7 0.28 3.36 4 3 Good Average Young
Mature No Recommendations 10 20 B
15
Willow
9
Stem 1 0.33,
Stem 2 0.28
6.96
4
0
Good
Good
Mature
No Recommendations
10 20
B
Group Number
Species Common
Name
Height
Diameter @ 1.6
RPA X 12
Diameter
Crown Spread
Crown Clear
Physical Condition
Structural Condition
Age Class
Management Recommendations
Remaining Contribution
Retention Category
1
Willow
8
0.13
1.56
3
0
Good
Good
Young
No Recommendations
10 20
B
2
Willow
5
0.90
10.80
3
0
Good
Good
Mature
No Recommendations
10 20
B
3 Willow,
Alder, Birch
8
0.14
1.68
3
0
Good
Good
Young
No Recommendations
10 20
B
Sight map with RPA Furthergate Plot 4
RPA Root protection is in blue. Refer to “RPA X 12 Diameter” on the individual tree survey for the tree root protection area
