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nts aiasc 2.01 0.1 1 8 cover sheet
arboricultural impact assessment, proposed development 22-26 smallwood avenue, homebush 25th September 2014
prepared by Melanie Howden - Ass. Dip. Hort. (Haw. Ag. C.), SoA. Arb. MAIH, MIACA Executive Summary This report has been prepared to assess the condition and significance of a number of trees on the properties known as 22, 24 & 26 Smallwood Avenue, Homebush and assess the potential impact of the proposed development on the identified trees.
The report was commissioned by Develotek Management PL and site instructions have been provided by PBD Architects. The site inspection and arboricultural assessments were conducted on 12th August 2014.
The assessments carried out in this report are based upon the Australian Standard 4970 - 2009, Protection of Trees on Development Sites. The terminology used in this report is also consistent with that used in the AS 4970-2009. The definition of a tree in this report is consistent with that described in Strathfield Council’s Tree Preservation Order, 2007 being “any tree having a height greater than four (4.0) metres or a girth greater than half (0.5) metre measured at a point one (1.0) metres above ground level”.
The site is situated on the eastern side of Smallwood Avenue and is a gently sloping site that falls towards the street frontage. The site is currently developed and contains 3 residential dwellings with detached garages and sheds. The landscape character consists of intermittent trees which are dominated by exotic and non-indigenous native plantings. The proposed development involves demolition of the existing built structures on the site and construction of multi-level apartments with basement car parking (PBD Architects, 2014) with associated landscaping (ATC, 2014).
There are 25 trees that have been considered in this report of which, 18 trees are located on the site, 3 trees are located within the road reserve & 4 trees are located on the adjoining allotments. Of the 25 trees considered in this report based upon the proposed plans:
5 trees are to be retained (0 on the site, 1 within the road reserve & 4 on the adjoining allotments), and 20 trees are proposed to be removed (18 on the site & 2 within the road reserve).
Contents
sheet 1 - this cover page
sheet 2 - existing site - tree locations & reference numbers
sheet 3-4 - arboricultural assessment - tree data sheets
sheet 5 - proposed development - tree retention & removal
sheet 6-7 - impact of proposed development on individual trees
sheet 8 - tree protection measures and report summary
RH 19.55
RH 18.63
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CONCRETE DRIVEWAY
HOUSE TILE ROOF No. 22
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110°59'30"42.67
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LOT 5 DP 9481
LOT 6 DP 9481
TIMBER FENCE
projectdate dwg no. rev.arboricultural impact assessment- 22-26 smallwood avenue, homebush
25/09/14 aiatn2.01 0.1 existing site - tree locations &reference numbers
scale at A3 sheet of3 8
prepared by
1: 200melanie howden
This plan is based upon:
Detail and Level Survey, Dwg. No. 9525 DET, Issue A, Dated 17/12/13,(CityServ Pty Ltd, Strathfield, NSW)
In addition to the trees identified on the survey 18 trees have beenadded to this plan as they are of a size / dimensions covered by StrathfieldCouncil's Tree Preservation Order. The additional trees are Tree No. 1, 2, 5,7, 8, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 24 & 25 and their locations,whilst based upon surveyed features, are approximate.
The tree canopy spreads on this plan have been adjusted from those on thesurvey to better reflect the actual canopy spreads however they remain asindicative graphics.
tree locations &reference numbers
tree legend
999
1
2 3
4
5
6
7
8
9 10111213141516
17
18
19
20 21
22
23
24
25
melanie howden nts 25/09/14 aiasd 2.01 0.1 3 8
project arboricultural impact assessment - 22-26 smallwood ave. homebush
drawing title arboricultural assessment – tree data sheet
tree significance
significance in the environment Trees need to be considered in the overall environment and are subject to specific legislation such as:
Threatened Species Conservation Act (NSW) 1995, and Noxious Weeds Act (NSW) 1993.
Threatened Species Conservation Act (NSW) 1995 The Threatened Species Conservation Act lists in its schedules a number of species, populations or ecological communities that are either endangered or vulnerable. The Act requires the preparation of a species impact statement if an activity or development is going to have a significant effect on species, populations or endangered ecological communities listed in the schedules of the Act. Where identified on or adjacent the site, threatened tree species are considered in this report, however no attempt is made to identify threatened ecological communities or populations.
Noxious Weeds Act (NSW) 1993 The Noxious Weeds Act provides the Minister with the powers to issue an Order declaring a plant noxious and these plants can be either agricultural or significant environmental pest species. The Minister’s declaration may specify a plant to be noxious in part or all of the State and the Minister also may specify the level of noxious weed control required for that species.
Environmental Pest Species There are a number of environmental pest species that commonly cause problems in developed urban areas or readily spread into natural bushland areas. In urban areas these species can have aggressive root systems and cause damage to built structures or services. Alternatively some species can be problematic in natural bushland areas degrading habitats and reducing natural biodiversity. Many of these are not considered noxious but are recognised by Councils as pest species and are exempt from protection under Council’s Tree Preservation Order.
significance in the landscape Assessment of a tree’s significance in the landscape is generally categorised as either:
Very High Landscape Significance- prominent from a broad landscape perspective; High Landscape Significance - prominent from a neighbourhood perspective; Moderate Landscape Significance - prominent from adjacent areas surrounding the site,
and Low Landscape Significance - prominent from a site perspective only.
tree condition & life expectancy
condition The assessment of the trees condition is undertaken by visual inspection of the trees themselves, surrounding vegetation and the site conditions. An assessment of each tree is undertaken taking into account the condition of the tree’s roots, trunk, branches, foliage, previous pruning works, pests and disease, nesting hollows, fauna scratchings and the surrounding environment that may influence the condition of the tree.
Safe Useful Life Expectancy (SULE) The condition information is used to determine the Safe Useful Life Expectancy (SULE) of each tree and takes into account the age of the tree, the life span of the species, local environment conditions, estimated life expectancy, the location of the tree and safety aspects. The SULE method takes into account whether a tree can be retained with an acceptable level of risk based on the information available at the time of inspection. A SULE assessment is not static as it relates to the tree’s health and the surrounding conditions. Whilst it is recognised that changes to the tree’s condition will affect the assessment, changes to the surrounding environment may result in changes to the SULE assessment.
Table 1 Safe Useful Life Expectancy (SULE), (Barrell, 2001) Category Description
1 Long -Life span greater than 40 years
2 Medium - Life span from 15 to 40 years
3 Short - Life span from 5 to 15 years
4 Should be removed within 5 years
5 Small, Young or Regularly Pruned, Trees that can readily be moved or replaced.
In addition to the categories listed above, trees that show signs of imminent structural failure are listed as ‘Unstable’.
Unstable Unstable in the ground or have significant trunk damage rendering them structurally hazardous.
development planning & general impacts on trees
tree protection zones Where trees are intended to be retained, development footprints should be located away from trees so as to provide adequate clearances for a tree protection zone. Disturbance within Tree Protection Zones can be detrimental to the tree’s root system and in turn affect the stability, health and condition of the tree. In many cases damage to the root systems is the major cause of tree decline in urban areas. Figure 3.1 Typical diagram of a Tree Protection Zone & Structural Root Zone of a tree based upon AS 4970 – 2009.
Where trees are multi-trunk specimens assessment needs to be made based upon the number of trunks and the diameter of each trunk. Based upon the Australian Standard for Protection of Trees on Development Sites, AS 4970 – 2009, the DBH of multi-trunk trees is calculated by:
development design & Tree Protection Zones
Where trees are intended to be retained, proposed developments must provide an adequate Tree Protection Zone around trees. This Tree Protection Zone is set aside for the tree’s root zone and it is essential for the stability and longevity of the tree. Existing soil levels should be retained within the Tree Protection Zone. Based upon the Australian Standard for Protection of Trees on Development Sites, AS 4970 – 2009, the radius of the Tree Protection Zone (TPZ) is calculated as: TPZ = 12 x DBH with a minimum 2.0m radius and a maximum 15m radius.
developments within the Tree Protection Zone
Minor encroachments into Tree Protection Zones Based upon AS 4970 – 2009 some development activity can occur within the vicinity of trees and minor encroachments can occur within the calculated Tree Protection Zone provided that: no more that 10% of the area (m2) of the Tree Protection Zone is removed (0.7 x
TPZ radius on 1 side only); the encroachment does not extend into the Structural Root Zone, and the area (m2) to be removed is compensated for by increasing the distance of the
Tree Protection Zone in other directions so that there is no net loss in area (m2) of the Tree Protection Zone
Major encroachments into Tree Protection Zones Where the proposed development activity is greater than that described as a minor encroachment (refer above); the activity is considered to be a major encroachment into the Tree Protection Zone. Where major encroachments are to occur within the Tree Protection Zone of trees intended to be retained, it must be demonstrated that the works or activities will not have a significant impact on the health and condition of the tree. To demonstrate this detailed root mapping investigation by non invasive methods may be necessary; and other factors such as the age class, health & vigour, trunk lean, disturbance tolerance of the species, and building design may need to be taken into account in the arboricultural assessment. Where major encroachments are proposed to occur into the Tree Protection Zone the tree’s Structural Root Zone should also be taken into account.
developments within the tree’s Structural Root Zone The Structural Root Zone is the area surrounding the tree where the severance of roots and excavation is likely to affect the structural stability of the tree and is likely to have a significant detrimental impact on the health & condition of the tree. Based upon AS 4970 – 2009 the radius of a tree’s Structural Root Zone (SRZ) is determined by measuring the diameter of the trunk immediately above the root buttress (DAB) and calculated by: SRZ = (DAB x 50) 0.42 x 0.64. Developments should not encroach into the tree’s Structural Root Zone and existing soil levels must remain unchanged. Excavation should not occur within this area unless a detailed arboricultural assessment is undertaken and Specific Tree Protection measures will be required.
Tree No Genus Species Common
Name Height
(m) Canopy Spread
(m) DBH (mm)
DAB (mm) Description
Environmental / Landscape
Significance Condition Foliage
Condition
% Canopy
Dead Wood
Evidence of Pests, Disease, Cavity, Bracket Fungi SULE On / off
site TPZ
Radius (m)
Area of
TPZ (m2)
1 Tristaniopsis laurina Water Gum 4 2 120 220 Semi-mature single trunk tree with an upright rounded form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 5% The tree has hollows at the base and at 0.7m on the eastern site.
2 Within road reserve
2.00 12.57
2 Lagerstroemia indica
Crepe Myrtle 5 6 1*120, 2*200, 1*180, 2*160
500 Mature multi trunk tree with an upright spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Deciduous None
10% Decay present in some branch stubs 2 On site 4.85 74.04
3 Rondeletia amoena - 4 4 15-20-40
300 Mature multi trunk tree with a low spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 10% Ivy is growing throughout the tree. 3 On site 2.00 12.57
4 Lagerstroemia indica
Crepe Myrtle 6 5 3*140 320 Mature multi trunk tree with a broad spreading form; an upright trunk/s and balanced canopy and branch development. Lower limbs of the tree have been pruned to 3m.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Deciduous None
<5% None evident 2 On site 2.38 17.74
5 Melaleuca sp. 7 6 1*300, 2*200
500 Dead multi trunk tree with an upright spreading form; an upright trunk/s and balanced branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree stability is suspect and its branch attachment appears poor. The tree is considered to be dead and displays no signs of any vigour.
None 100% The tree is dead Unstable On adjacent allotment
4.95 76.94
6 Cinnamomum camphora
Camphor Laurel
15 14 1*500, 1*400. 1*600
1600 Mature multi trunk tree with an upright spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
High L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in moderate health and displays fair vigour.
Good 10% None evident 1 On site 10.53 348.48
7 Erythrina crista-galli Cockscomb Coral Tree
11 7 1*400, 1*240
600 Mature twin trunk tree with a broad spreading form; an upright trunk/s and majority of canopy and branch development is towards the south east. No evidence of significant branch pruning.
Moderate L/scape Sig.
The tree appears stable and its branch attachment appears sound. The tree is considered to be in moderate health and displays fair vigour.
Deciduous None
10% The tree appears to be suppressed by the adjacent vegetation
2 On adjacent allotment
5.60 98.48
melanie howden nts 25/09/14 aiasd 2.01 0.1 4 8
project arboricultural impact assessment - 22-26 smallwood ave. homebush
drawing title arboricultural assessment – tree data sheet
Tree No Genus Species Common
Name Height
(m) Canopy Spread
(m) DBH (mm)
DAB (mm) Description
Environmental / Landscape
Significance Condition Foliage
Condition
% Canopy
Dead Wood
Evidence of Pests, Disease, Cavity, Bracket Fungi SULE On / off
site TPZ
Radius (m)
Area of
TPZ (m2)
8 Ligustrum lucidum Large Leaf Privet
7 4 5*200 300 Mature multi trunk tree with an upright elliptical form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Noxious Weed The tree appears stable and its branch attachment appears sound. The tree is considered to be in moderate health and displays fair vigour.
Good 5% None evident 2 On adjacent allotment
5.37 90.51
9 Callistemon viminalis
Weeping Bottlebrush
8 7 2*400 550 Mature multi trunk tree with a broad spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Moderate L/scape Sig.
The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 10% Some epicormic growth appearing on 1st order branches.
3 On site 6.79 144.82
10 Cupressus sp. Cypress 5 2 3*160 260 Semi-mature twin trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 3.33 34.76
11 Cupressus sp. Cypress 5 1 4*160 260 Semi-mature multi trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 5% None evident 2 On site 3.84 46.34
12 Cupressus sp. Cypress 5 1 3*160 260 Semi-mature multi trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 3.33 34.76
13 Cupressus sp. Cypress 5 2 200 260 Semi-mature single trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 2.40 18.10
14 Cupressus sp. Cypress 5 2 3*160 260 Semi-mature multi trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 3.33 34.76
15 Cupressus sp. Cypress 5 2 2*160, 1*180
260 Semi-mature multi trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 3.97 49.42
16 Cupressus sp. Cypress 5 2 1*180, 2*160
260 Semi-mature multi trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good <5% None evident 2 On site 3.47 37.83
17 Tristaniopsis laurina Water Gum 5 6 1*200, 1*150, 1*160
380 Mature multi trunk tree with a broad spreading form; an upright trunk/s and balanced canopy and branch development. Appears that the central leader has been pruned/removed at 5m to provide clearances to overhead wires.
Low L/scape Sig. The tree appears stable and its branch attachment appears fair. The tree is considered to be in poor health and displays poor vigour.
Poor The tree has sparse foliage and twiggy dead wood through the canopy. Decay is present in branch stubs and the tree has a lower trunk wound on the southern side.
4 Within road reserve
15.00 707.14
18 Tibouchina sp. - 4 3 3*100, 1*120, 1*200
500 Over mature multi trunk tree with a low spreading form; an upright trunk/s and balanced canopy and branch development. Appears that the central leader has been pruned/removed at 2m and the upper branches have been pruned at 3m for overhead wire clearances.
Low L/scape Sig. The tree appears stable and its branch attachment appears fair. The tree is considered to be in moderate health and displays fair vigour.
Fair 15% There is epicormic growth through the tree and some cracking in the lower trunk.
4 On site 3.49 38.20
19 Tristaniopsis laurina Water Gum 4 5 1*180, 1*280, 2*60
420 Mature multi trunk tree with a low spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in moderate health and displays fair vigour.
Good 10% None evident 2 Within road reserve
4.12 53.40
20 Camellia japonica Camellia 4 2 7*40 200 Mature multi trunk tree with a low rounded form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Very Good 5% None evident 2 On site 2.00 12.57
21 Camellia japonica Camellia 4 2 2*40, 1*50, 1*60
200 Mature multi trunk tree with a low rounded form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 5% None evident 2 On site 2.00 12.57
22 Grevillea banksii Crimson Grevillea
6 6 220 400 Over mature single trunk tree with an upright spreading form; an upright trunk/s and majority of canopy and branch development is towards the north No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears fair. The tree is considered to be in moderate health and displays fair vigour.
Fair 20% None evident 4 On site 2.64 21.90
23 Leptospermum petersonii
Lemon-Scented Tea Tree
6 5 300 380 Mature single trunk tree with an upright spreading form; an upright trunk/s and balanced canopy and branch development. Lower limbs of the tree have been pruned to 2m.
Low L/scape Sig. The tree appears stable and its branch attachment appears fair. The tree is considered to be in moderate health and displays fair vigour.
Fair 5% Dieback is evident in the upper canopy where there is twiggy dead wood. The tree has a trunk wound on the southern side at 2-3m where a leader has failed.
3 On site 3.60 40.73
24 Grevillea robusta Silky Oak 6 3 180 220 Immature single trunk tree with an upright pyramidal form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Good 5% None evident 2 On site 2.16 14.66
25 Howea forsteriana Kentia Palm 5 3 180 200 Mature single trunk tree with an elevated spreading form; an upright trunk/s and balanced canopy and branch development. No evidence of significant branch pruning.
Low L/scape Sig. The tree appears stable and its branch attachment appears sound. The tree is considered to be in good health and displays good vigour.
Very Good 5% None evident 2 On adjacent allotment
1.00 3.14
RH 19.55
RH
18.
39
RH
18.
75
FL 14.47
PP
TEL
VERANDA
TEL
PIT
BRICK GARAGE
GARAGE
56°5
7'00"
11.47
5
290°59'30"61.435
290°59'30"42.67
200°
59'3
0"12
.19
20°5
9'30
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0"12
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RL 15.4
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projectdate dwg no. rev.arboricultural impact assessment- 22-26 smallwood avenue, homebush
25/09/14 aiatn2.01 0.1 proposed development - treeretention & removal
scale at A3 sheet of5 8
prepared by
1: 200melanie howden
This plan is based upon:
Detail and Level Survey, Dwg.No. 9525 DET, Issue A, Dated 17/12/13,(CityServ Pty Ltd, Strathfield, NSW)
Ground Floor Plan. Dwg.No. DA05, Issue A, Dated 17/09/14,(PBD Architects, Surry Hills, NSW)
In addition to the trees identified on the survey 18 trees have beenadded to this plan as they are of a size / dimensions covered by StrathfieldCouncil's Tree Preservation Order. The additional trees are Tree No. 1, 2, 5,7, 8, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 24 & 25 and their locations,whilst based upon surveyed features, are approximate.
The tree canopy spreads on this plan have been adjusted from those on thesurvey to better reflect the actual canopy spreads however they remain asindicative graphics.
trees to be retained
tree legend
trees to be removed
tree protection fencing
999
1
2 3
4
5
6
7
8
9 10111213141516
17
18
19
20 21
22
23
24
25
999
melanie howden nts 25/09/14 aiasi 2.01 0.1 6 8
project
arboricultural impact assessment - 22-26 smallwood ave. homebush
drawing title impact of proposed development on individual trees
typical application of Australian Standard 4970-2009 - Protection of Trees on Development Sites
Tree No Genus Species DBH
(mm)DAB (mm) SULE
Env./ L/scape
Sig.
TPZ Radius
(m)
Area of TPZ (m2)
Radius of 90% of TPZ area
(7/10)
SRZ Radius
(m) Adjacent Works Influence on Tree Plan Status On / off
site
1 Tristaniopsis laurina
120 220 2 Low L/scape
Sig.
2.00 12.57 1.40 1.75 The existing concrete footpath is within 0.5m (east) of the tree and the path is likely to be replaced.
No significant impact with appropriate Tree Protection Measures.
Retained with Specific Tree Protection Measures
Within road reserve
2 Lagerstroemia indica
1*120, 2*200, 1*180, 2*160
500 2 Low L/scape
Sig.
4.85 74.04 3.40 2.47 The proposed basement car park and ground floor terrace spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
3 Rondeletia amoena
15-20-40
300 3 Low L/scape
Sig.
2.00 12.57 1.40 2.00 The proposed basement car park and ground floor terrace spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
4 Lagerstroemia indica
3*140 320 2 Low L/scape
Sig.
2.38 17.74 1.66 2.05 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
5 Melaleuca sp. 1*300, 2*200
500 Unstable Low L/scape
Sig.
4.95 76.94 3.46 2.47 The proposed paved external landscape terrace is within 4.1m (south) of the tree.
No significant impact with appropriate Tree Protection Measures.
Retained with General Tree Protection Measures
On adjacent allotment
6 Cinnamomum camphora
1*500, 1*400. 1*600
1600 1 High L/scape
Sig.
10.53 348.48 7.37 4.03 The proposed paved external landscape terrace is within 1.8m (south) of the tree.
Excavation is likely to involve severance of significant tree roots resulting in the decline of the tree and/or rendering it unstable.
To be Removed
On site
7 Erythrina crista-galli
1*400, 1*240
600 2 Moderate L/scape
Sig.
5.60 98.48 3.92 2.67 No proposed works apart from soft landscaping within the tree's Tree protection Zone.
No significant impact with appropriate Tree Protection Measures.
Retained with General Tree Protection Measures
On adjacent allotment
8 Ligustrum lucidum
5*200 300 2 Noxious Weed
5.37 90.51 3.76 2.00 No proposed works apart from soft landscaping within the tree's Tree protection Zone.
No significant impact with appropriate Tree Protection Measures.
Retained with General Tree Protection Measures
On adjacent allotment
9 Callistemon viminalis
2*400 550 3 Moderate L/scape
Sig.
6.79 144.82 4.75 2.57 The existing garage is to be demolished within 0.6m (south east) of the tree and
Likely to be damaged in conjunction with the proposed demolition works
To be Removed
On site
10 Cupressus sp. 3*160 260 2 Low L/scape
Sig.
3.33 34.76 2.33 1.88 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
11 Cupressus sp. 4*160 260 2 Low L/scape
Sig.
3.84 46.34 2.69 1.88 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
12 Cupressus sp. 3*160 260 2 Low L/scape
Sig.
3.33 34.76 2.33 1.88 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
13 Cupressus sp. 200 260 2 Low L/scape
Sig.
2.40 18.10 1.68 1.88 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
14 Cupressus sp. 3*160 260 2 Low L/scape
Sig.
3.33 34.76 2.33 1.88 The proposed building footprint spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
melanie howden nts 25/09/14 aiasi 2.01 0.1 7 8
project
arboricultural impact assessment - 22-26 smallwood ave. homebush
drawing title impact of proposed development on individual trees
Tree No Genus Species DBH
(mm) DAB (mm) SULE
Env./ L/scape
Sig.
TPZ Radius
(m)
Area of TPZ (m2)
Radius of 90% of TPZ area
(7/10)
SRZ Radius
(m) Adjacent Works Influence on Tree Plan Status On / off
site
15 Cupressus sp. 2*160, 1*180
260 2 Low L/scape
Sig.
3.97 49.42 2.78 1.88 The proposed building footprint spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
16 Cupressus sp. 1*180, 2*160
260 2 Low L/scape
Sig.
3.47 37.83 2.43 1.88 The proposed building footprint spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
17 Tristaniopsis laurina
1*200, 1*150, 1*160
380 4 Low L/scape
Sig.
15.00 707.14 10.50 2.20 The existing concrete footpath is within 0.5m (east) of the tree and the path is likely to be replaced.
No significant impact however the tree is in poor condition.
To be Removed
Within road reserve
18 Tibouchina sp. 3*100, 1*120, 1*200
500 4 Low L/scape
Sig.
3.49 38.20 2.44 2.47 The proposed basement car park and ground floor terrace spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
19 Tristaniopsis laurina
1*180, 1*280, 2*60
420 2 Low L/scape
Sig.
4.12 53.40 2.89 2.30 The proposed driveway crossing spatially conflicts with the location of the tree.
Not applicable To be Removed
Within road reserve
20 Camellia japonica 7*40 200 2 Low L/scape
Sig.
2.00 12.57 1.40 1.68 The proposed basement car park spatially conflicts with the location of the tree.
Not applicable To be Removed
On site
21 Camellia japonica 2*40, 1*50, 1*60
200 2 Low L/scape
Sig.
2.00 12.57 1.40 1.68 The proposed basement car park is within 0.5m (west) of the tree.
Excavation is likely to involve severance of significant tree roots resulting in the decline of the tree and/or rendering it unstable.
To be Removed
On site
22 Grevillea banksii 220 400 4 Low L/scape
Sig.
2.64 21.90 1.85 2.25 The proposed landscape path is within 1.7m (west) of the tree.
No significant impact however, the tree is considered to be in poor condition.
To be Removed
On site
23 Leptospermum petersonii
300 380 3 Low L/scape
Sig.
3.60 40.73 2.52 2.20 The proposed landscape path is within 1.7m (west) of the tree.
No significant impact however, retention of the tree conflicts with the landscape plan.
To be Removed
On site
24 Grevillea robusta 180 220 2 Low L/scape
Sig.
2.16 14.66 1.51 1.75 The proposed landscape path is within 1.7m (west) of the tree.
No significant impact however, retention of the tree conflicts with the landscape plan.
To be Removed
On site
25 Howea forsteriana
180 200 2 Low L/scape
Sig.
1.00 3.14 0.70 0.70 No proposed works apart from soft landscaping within the tree's Tree protection Zone.
No significant impact with appropriate Tree Protection Measures.
Retained with General Tree Protection Measures
On adjacent allotment
Figure 7.1 Tree No. 1 within the Smallwood Avenue road reserve outside 22 Smallwood Avenue.
Figure 7.2 Tree No. 17 within the Smallwood Avenue road reserve outside 24 Smallwood Avenue.
melanie howden nts 25/09/14 aiacp 2.01 0.1 8 8
project
arboricultural impact assessment - 22-26 smallwood ave. homebush
drawing title tree protection measured & report summary
tree protection measures
specific tree protection measures
Proposed Works within the Vicinity of Tree No. 1
Prior to demolition or construction, secure protective fencing is to be erected around Tree No. 1 along the western side of the existing concrete footpath as shown on sheet 5 of this report.
The existing concrete footpath is within 0.5m (east) of the Tree No.1 and the path is likely to be replaced. To minimise disturbance to the root zone of the tree, all works within the 2m radius of Tree Protection Zone must be undertaken under the supervision of an experienced and qualified project arborist in accordance with the specification below.
general tree protection during construction
Prior to demolition or construction, the trees identified as being removed shall be removed ensuring that no damage occurs to the root system, trunk, branches or foliage of trees identified as being retained.
Prior to demolition or construction, secure protective fencing is to be erected incorporating Tree Protection Zone Signage
The building contractor shall ensure that at all times during site works no activities, stock piles, storage or disposal of materials shall take place within the fenced off areas and that all Protective Fences remain secure throughout the development work period.
All access within the tree protection fencing for temporary and permanent works must be carried out under the instructions of an experienced and qualified project arborist.
Tree Protection Fencing shall remain in functional condition for the duration of building works and can be removed to allow for works identified in the landscape plan.
Specific excavation for services that require critical fall (eg. sewer, stormwater) may be undertaken within the tree protection zones only under the direct supervision of the project arborist.
Outside the approved building footprints or retaining walls, landscape works in the vicinity of the trees must be sympathetic to tree retention and existing ground levels within the Tree Protection Zones (refer TPZ sheets 6-7) must remain unchanged.
Any tree damage that occurs to trees or tree roots during site works is to be treated by an experienced and qualified arborist.
Should branch pruning be required, all pruning works including the removal of deadwood are to be undertaken in accordance with Australian Standard AS 4373-2007 Pruning of Amenity Trees and the work is to be undertaken by an experienced and qualified arborist.
tree report summary
conclusion
This report has been prepared to assess the condition and significance of a number of trees on the properties known as 22, 24 & 26 Smallwood Avenue, Homebush and assess the potential impact of the proposed development on the identified trees.
The assessments carried out in this report are based upon the Australian Standard 4970 - 2009, Protection of Trees on Development Sites. The terminology used in this report is also consistent with that used in the AS 4970-2009. The definition of a tree in this report is consistent with that described in Strathfield Council’s Tree Preservation Order, 2007 being “any tree having a height greater than four (4.0) metres or a girth greater than half (0.5) metre measured at a point one (1.0) metres above ground level”.
The site is situated on the eastern side of Smallwood Avenue and is a gently sloping site that falls towards the street frontage. The site is currently developed and contains 3 residential dwellings with detached garages and sheds. The landscape character consists of intermittent trees which are dominated by exotic and non-indigenous native plantings. The proposed development involves demolition of the existing built structures on the site and construction of multi-level apartments with basement car parking (PBD Architects, 20414) with associated landscaping (ATC, 2014).
There are 25 trees that have been considered in this report of which, 18 trees are located on the site, 3 trees are located within the road reserve & 4 trees are located on the adjoining allotments. Of the 25 trees considered in this report based upon the proposed plans:
• 5 trees are to be retained (0 on the site, 1 within the road reserve & 4 on the adjoining allotments), and
• 21 trees are proposed to be removed (18 on the site & 2 within the road reserve)
Details of the 5 Trees to be Retained Adjacent the Site Condition Environmental / Landscape Significance
Noxious Env. Pest (Exempt
from TPO)
Low L/scape
Sig.
Moderate L/scape
Sig.
High L/scape
Sig.
Very High L/scape
Sig.
SULE - 1 SULE - 2 1 2 1 SULE - 3 SULE - 4 Unstable 1
Details of the 20 Trees to be Removed On Site & within Road Reserve
Condition Environmental / Landscape Significance
Noxious Env. Pest (Exempt
from TPO)
Low L/scape
Sig.
Moderate L/scape
Sig.
High L/scape
Sig.
Very High L/scape
Sig.
SULE - 1 1 SULE - 2 13 SULE - 3 2 1 SULE - 4 3 Unstable
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