Town of Gawler Council Assessment Panel

ATTACHMENTS UNDER SEPARATE COVER

Monday 11 December 2017 Item Page No

5.3 Development Application: 490/147/2017 117 Applicant: Stimson Consulting Address: 5-7 Penrith Avenue, Gawler West Nature of Development: Land Division 1 allotment into 3 (Torrens title)

including public reserve, associated earthworks and removal of 1 Regulated Tree Eucalyptus camaldulesis - River Red Gum

Attachment 1 - Attachment 2 - Attachment 3 -

Application Plans and Documentation Arborist report supplied by applicant Council Commissioned Arborist Report

119 139 150

Page 117 of 403

Page 118 of 403

CENTERLINE OF RIVER THE BOUNDARY

Development No. 490 / D007 / 17

Town of Gawler

Proposed Plan of Division

Allotment 21 in D62331

Hundred of Mudla Wirra

in the area named

GAWLER WEST

CT 6142/80

Portion of allotment 211 marked R is to be subjectto a right of way in favour of Council (6m wide).

Existing Council easement A is to be extinguished.

Existing Council easement B is to be extinguished.

Dimensions and areas are subject to survey.

W E

S

N

P

E

N

R

IT

H

A

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D62331

Alexander & Symonds Pty Ltd

11 King William Street Kent Town,

South Australia 5067

PO Box 1000 Kent Town, SA 5071

DX 209 ABN 93007 753 988

T (08) 8130 1666

F (08) 8362 0099

W www.alexander.com.au

E adelaide@alexander.com.au

+ Property + Land Development +

+ Construction + Mining +

+ Spatial Information Management +

Surveying

Alexander

Symonds

Consultants

LICENSED SURVEYOR

Original Sheet Size B2© ALEXANDER & SYMONDS PTY. LTD.

REF:

DWG NO.:REVISION:

A002117.0000

A002117PROP(B)B

RHF 11.09.2017

5 PENRITH AVENUE

GAWLER WEST

m

1:1000 @ B2

10080604020100

D62331

F4529

D78633

D85515

D74600

F121671

GAWLER

RIVER

R

11.0817.2

7.825

5

70

25

70

15.57

59.79

43.8

1

260.

14

160.06

28.1

9

52.79

115.09

12.72

15.9

14.14

38.01

27.67

24.97

40.45

19.38 9.5617.82

48.8

17.5

6

16.29.89

37.3

25.25

31.4424.84

67.52

119.11

7.181 ha211

1750m²212

1633m²213

2.46 ha approxRESERVE

ST

RE

ET

BR

IGA

LO

EASEMENT BOUNDARY ON EXISTING FENCE

Top of bank.

Regulated tree to be removed asper Adelaide ARB tree report dated11.01.2017

26.36

45

AMENDED PLAN

11.09.2017

ATTACHMENT 1

Page 119 of 403

EL:N:E:

44.68m

TBM: NAIL IN KERB292098.9646168747.619

21

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43 65

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7 8 109 1211

DRAWN

DATE

SCALES

CHECKED

ENGINEER

OCTOBER 2017

COPYRIGHT RESERVED

DRAWING No.

C H

DRAWING TITLE

PROJECT

No REVISION CHE'KDDRAWN DATE

G

F

E

7 8 9 10

D

C

B

11 12

A

CONSUL

TING EN

GINEERS

Civil StructuralEnvironmental GeotechnicalMechanical ElectricalFire HydraulicsLifts Green ESD

Level 6, 100 Pirie Street,Adelaide SA 5000Telephone 08 8238 4100Facsimile 08 8410 1405Berri Office: 25 Vaughan Terrace,Berri SA 5343

NOT F

OR C

ONSTRUCTIO

N

PA. PLANNING APPROVAL ISSUE BH CAT 23.10.17

BH

AS SHOWN

BH

CAT

Page 120 of 403

1 Victoria Terrace GAWLER SA 5118

Phone: +61 402134568

john@stimsonconsulting.net.au www.stimsonconsulting.net.au

ABN 87 096 337 576

27 October2017

Mr J Booker Senior Development Assessment Planner Town of Gawler PO Box 130 GAWLER SA 5118

Dear James 5 Penrith Avenue Gawler West – Land Division 490/D007/17

With regard to the above land division application I have been engaged by the owners –

P and H Bayet – to assist with gaining planning approval. This letter provides a town planning assessment of the proposal. The proposal has been the subject of considerable discussion between Council staff and the applicant including myself. The Site and Locality

The subject land is allotment 21 in Deposited Plan 62331 and is more accurately described in Certificate of Title Volume 6142 Folio 80 (copy attached). The land is 9.99ha in size, has a frontage to Penrith Ave of 66.08m and has the Gawler River as its northern and western boundaries. There are two easements in favour of Council over the land for the carrying out of works – presumably to be associated with works associated with the Gawler River. The easements are not a public right of way.

There is an existing detached dwellling located approximately in the centre of the subject land and has vehicular access via an unsealed driveway that is located in the northern portion of the site (see photo below) and also has access (largely unused) via another driveway which also accesses Penrith Ave almost opposite Brigalo St (see photo on following page). There are numerous trees on site including regulated and significant trees. The land has been used for horse keeping and growing of crops. A large proportion of the land is flood affected from the Gawler River.

Photo of site looking southwest at existing (northern) access point

Page 121 of 403

PAGE 2

Photo looking west at existing (southern) access point

The character of the locality (see aerial photo with cadastral boundaries shown on the following page) is mixed with residential on standard suburban allotments being located to the east. The Gawler River is a significant feature to the north, west and south of the land with numerous large trees. The heritage listed Para Para House is located to the

south. There are a few more modern detached dwellings on larger allotments located immediately to the south. On the northwestern side of the Gawler River are suburban sized residential allotments that have been developed in the last decade as well as some detached dwellings on larger allotments that are older.

Page 122 of 403

PAGE 3

Proposal

The proposed land division will create two allotments both with 25m frontages to Penrith Ave, a reserve that is 2.46ha in size and a remainder allotment (with existing detached dwelling) that is 7.18ha in size. This larger allotment will have vehicular access to Penrith Ave via a 6m wide “handle” adjacent the southern boundary which will utilise the existing driveway.

The width of the reserve is at least 20m and will provide at least a 10m wide corridor above the top of bank along the Gawler River. It widens out as it gets closer to Penrith

Ave so the gradient between the top of bank and the northern boundary of proposed lot 213 is no greater than 3%. Achieving this meant the northwest corner of proposed lot 213 was amended. See blue arrow on plan above. A public right of way is proposed running NE – SW between two parts of the river. The placement of this right of way is aligned with existing fencing and is directly in line with the end of the bike path on the

northern side of the Gawler River. Potentially in the future, a pedestrian / bicycle bridge across the river would enable the existing trail system to be extended through the subject land and hopefully further south along the river and towards Ryde St.

Page 123 of 403

TMK CONSULTING ENGINEERS 1611009_SMR/C

12th October 2017

STORMWATER HYDROLOGICAL REPORT

5-7 PENRITH AVENUE, GAWLER WEST SA

prepared for

STIMSON CONSULTING

Page 124 of 403

Our Ref: 1611009_SMR/B <BH/cat> 12 October 2017 STIMSON CONSULTING JOHN STIMSON 1 VICTORIA TERRACE GAWLER SA 5118 ATTENTION: JOHN STIMSON Dear John, RE: STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE, GAWLER WEST

TMK Consulting Engineers is pleased to present a copy of our Stormwater Hydrological Report for the above mentioned Project. This report has been prepared to comply with the following relevant SAA Standards and Guides:

ARRB Special Report 35: Subsurface drainage of road structures; Australian Rainfall and Runoff, Volumes 1 & 2: A guide to flood estimation; Australian Runoff Quality: A guide to water sensitive urban design; Urban Stormwater Best Practice Environmental Management Guidelines; Storm Drainage Design in Small Urban Catchments: A handbook for Australian practice; Water Sensitive Urban Design (WSUD) Technical Manual for the Greater Adelaide Region.

This report must be read in conjunction with all attachments. Changes to the design or construction must not be made without further written advice from the Engineer. This report is valid for a period of 24 months, based on current standards and regulations. If you require further information or clarification regarding any aspect of this report, please do not hesitate to contact the undersigned. For and on behalf of TMK Consulting Engineers

BENOIT HOPKINS Engineer

Page 125 of 403

Our Ref: 1611009_SMR-C October 2017

STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE

GAWLER WEST SA

Document Title: Stormwater Management Report © Document Code: CF029 03 K:\2017\09\1709034\Civil Drawings and Calcs\Design Calculations and Details\1611009_SMR-C.docx 3 of 7

A. General INTRODUCTION

This report details the stormwater hydrology for the proposed residential land division located at 5-7 Penrith Avenue, Gawler West. The objective of the report is to provide hydrological advice with respect to the 1 in 100 year ARI flood level and the Town of Gawler flood plain management requirements and to recommend a minimum Finished Floor Level (FFL) and appropriate location for the proposed residential dwelling/s. Our recommendations are based on the available survey data (Alexander & Symonds drawing no. A002117_DETAIL dated: 24/01/17 found in Appendix A) and from information documented within the Gawler River Floodplain Mapping Report (Australian Water Environments, September 2015) undertaken for the Gawler River Floodplain Management Authority (GRFMA).

PROPOSED DIVISION

It is our understanding that a land division is proposed within the allotment situated adjacent Penrith Avenue at the eastern boundary of the site. The subject land is classified as being within the Rural Living Zone and Gawler River Floodplains Area.

B. Hydrology OVERVIEW

The subject site is located east of the Gawler River and covers an area of approximately 9.56ha consisting of an existing residential dwelling and open pastures (refer Figure 1 – Site Aerial View). The land generally falls toward the Gawler River from the centre of the site. In accordance with GRFMA flood hazard ratings the allotment could be categorized as having an extreme flood hazard, however there are various areas located to the east of the site that are nominated as being flood free or of a low/moderate hazard risk (refer Appendix B – 1 in 100 ARI Flood Hazard Map).

Figure 1 - Site Aerial View

Page 126 of 403

Our Ref: 1611009_SMR-C October 2017

STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE

GAWLER WEST SA

Document Title: Stormwater Management Report © Document Code: CF029 03 K:\2017\09\1709034\Civil Drawings and Calcs\Design Calculations and Details\1611009_SMR-C.docx 4 of 7

FLOOD ASSESSMENT REQUIREMENTS Our assessment considers the following requirements. In accordance with the Rural Living Zone Principles of Development Control as outlined in the Gawler (CT) Council Development Plan (Consolidated – 28 April 2016) it is stated that; Hazards 5 Detached dwellings should only be developed where:

a) the finished floor level is equal to or greater than 300 millimetres above the predicted level of a

1 in 100 ARI flood event. FLOOD ASSESSMENT FINDINGS

Current floodplain mapping for the 1 in 100 year ARI was overlaid with the land title (CT 6142/80) in order to predict the extent of flooding within the site (refer Appendix C – Flood Hazard Overlay). Colored shading indicates the depth of flooding with respect to the existing surface level in the corresponding area. The proposed residential dwellings should be located in areas of minimal inundation. Areas highlighted green (low 0-0.3m), light blue (moderate 0.3-0.6m) and orange (high 0.6-1.2m) are abundant within the area proposed for division. The findings are as follows (all levels denoted in Australian Height Datum format);

The flood level is classified as being ‘high’ at the frontage of both lots 212 and 213.

The flood level is classified as being ‘low’ at the rear of both lots 212 and 213.

The 1 in 100 year ARI flood level is approximately 45.4m. The location of the proposed dwellings is not considered to impeded the flow of floodwaters

through the land nor increase the risk of flooding to neighboring properties due to the set back from the lower lying Penrith Avenue.

C. Recommendations

Given our assessment based on information provided by Alexander & Symonds and a review of the Gawler River Floodplain Mapping Report for the 1 in 100 year ARI flood event, it is recommended that any residential development within the proposed area of division should ensure the following:

The minimum finished floor level (FFL) of the proposed residential dwellings located within

allotments 212 & 213 should provide the required minimum of 300mm freeboard above the maximum 1 in 100 year ARI flood level of 45.4m. Hence, the minimum FFL should be 45.7m.

In order to provide safe access to and from proposed dwellings during a 1 in 100 year ARI flood

event an access driveway to Penrith Avenue should be constructed at a minimum level of 45.4m adjacent the boundary of allotment D62331.

Page 127 of 403

Our Ref: 1611009_SMR-C October 2017

STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE

GAWLER WEST SA

Document Title: Stormwater Management Report © Document Code: CF029 03 K:\2017\09\1709034\Civil Drawings and Calcs\Design Calculations and Details\1611009_SMR-C.docx 5 of 7

APPENDIX A

SITE SURVEY

Page 128 of 403

TEL MARKER POST

TREES WERE SURVEYED ON THE SOUTH-EASTERN SIDE OF THE TRUNK

EXISTING

CENTERLINE OF GAWLER RIVER

DIRT DRIVEWAY

EL:N:E:

44.68m

TBM: NAIL IN KERB292098.2866168746.937

SUBJECT TO AN EASEMENT TO THE COUNCIL

PROPOSED BOUNDARY LINE

CONTOUR INTERVAL:SURVEY:DRAWN:CHECKED:

0.2mAHM 16.01.2017AHM 24.01.2017 ME

VERTICAL:HORIZONTAL:

SCALE: GROUND (CSF = )

COORDINATE SYSTEMAHDGROUND PLANE ORIENTEDTO: MGA 94 ZONE 54

1.00012454

ADOPTED STATION & AUTHORITYPSM RL:PSM E:

N:

6628/26428 44.448292122.446

6168729.608

SDB

SDBSDB

SDB denotes SA Government survey data basevalues ( Dated: 15 / 09 / 1995 )

ADDITIONS, AMENDMENTS AND APPROVALS

DESCRIPTIONDATEREV CALC FIELD

0 24.01.2017 INITIAL DETAIL & LEVEL AHM AHMAlexander & Symonds Pty Ltd

11 King William Street Kent Town,

South Australia 5067

PO Box 1000 Kent Town, SA 5071

ABN 93007 753 988

T (08) 8130 1666

F (08) 8362 0099

W www.alexander.com.au

E adelaide@alexander.com.au

+ Property + Land Development +

+ Construction + Mining +

+ Spatial Information Management +

Surveying

Alexander

Symonds

Consultants

© ALEXANDER & SYMONDS PTY. LTD. ORIGINAL SHEET SIZE A2

Notes:Property boundaries shown hereon as DCDB have beensourced from the relevant government authority and may beof poor accuracy. DCDB data has been provided for generalinformation only. Centreline of Gawler River has beenprovided from DCDB data.

SHEET REVISIONDRAWING No.

DETAIL & LEVEL SURVEY21 PENRITH AVENUE

GAWLER WEST

A002117_DETAIL 0

m

1:500

504030201050

1 OF 22 OF 2

Page 129 of 403

Our Ref: 1611009_SMR-C October 2017

STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE

GAWLER WEST SA

Document Title: Stormwater Management Report © Document Code: CF029 03 K:\2017\09\1709034\Civil Drawings and Calcs\Design Calculations and Details\1611009_SMR-C.docx 6 of 7

APPENDIX B

1 IN 100 ARI FLOOD HAZARD MAP

Page 130 of 403

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Page 131 of 403

Our Ref: 1611009_SMR-C October 2017

STORMWATER HYDROLOGICAL REPORT 5-7 PENRITH AVENUE

GAWLER WEST SA

Document Title: Stormwater Management Report © Document Code: CF029 03 K:\2017\09\1709034\Civil Drawings and Calcs\Design Calculations and Details\1611009_SMR-C.docx 7 of 7

APPENDIX C

FLOOD HAZARD OVERLAY

Page 132 of 403

Page 133 of 403

PAGE 4

The proposal also proposes some fill so that the bench levels for future dwellings and driveways are at the appropriate height – as detailed in the TMK Stormwater Hydrological Report (attached). See plan below.

The bench shown on the plan on the previous page is 20m deep and 33m wide. This will easily allow two substantial dwellings to be built with outbuildings. Fencing outside of the benched area will be open style fencing so as to not impede flood waters. A regulated tree (eucalyptus camaldulensis) is proposed to be removed as part of the

development. The arborist report by Adelaide ARB (Shane Selway) recommends its removal due to its poor state of health including a large amount of terminal deadwood throughout the crown. A copy of the report is attached. Infrastructure services can be provided to the proposed allotments. Electricity, telecommuications and water is in Penrith St. Sewer will require a 50m extension from Brigalo St to the proposed allotments. This has been confirmed with SA Water. Proposed

lot 211 (with the existing detached dwelling) will continue to use its own septic tank.

Page 134 of 403

PAGE 5

Development Plan Considerations

The subject land is located within the Rural Living Zone. Land division within the zone is a consent on merit use. A major benefit to the community of the proposal is the creation of a reserve that will perform as an extension of the existing Gawler Rivers linear park. This is in accordance with General Section Objectives 61-64 and PDCs 167 – 169. It is also in accordance with

Objective 47 and PDCs 123, 125 and 126 relating to the Metropolitan Open Space System. Zone PDC 2 seeks new allotments to be at least 4 hectares in size and have a frontage to depth ratio of at least 1:3. Clearly the two proposed allotments (1633sqm and 1750sqm)

are less than 4ha in size, however they do meet the frontage to depth ratio.

The proposal is able to create allotments that would result in dwellings and access to those dwellings that are not within the flood affected area. The proposed bench levels of lots 212 and 213 are 45.4m so any future FFL of detached dwellings is at least 45.7m. As such the proposal complies with Zone PDCs 4, 5 and 9, as well as General Section Hazard Objectives 24, 25, 27 - 29 and PDCs 54-58, 64, 68 and 70.

PDC66 is partly complied with and partly not. The proposed reserve allotment complies with 66b, but the two proposed allotments for residential purposes do not comply with 66a. The removal of the regulated tree complies with PDC 208. It should be noted that a future application for a dwelling within 100m of the top of bank to the Gawler River will be classified as non-complying. Council has dealt with this previously in recent times with the land division and many of the subsequent dwellings in

Hogben Ave Cunningham St, Lawes Tce, Jamieson Ct and Richardson Dr in Deposited Plan 91929 located on the northern side of the Gawler River. On the basis any future dwellings will have FFL and their vehicular access will have a bench level above the flood level the hazard risks have been dealt with. Conclusion

The proposal seeks to create two additional allotments for residential use which are considerably larger than suburban allotments and are similar to two other allotments located on the western side of Penrith Ave but are smaller than the Development Plan policy seeks, as well as creating a 2.46ha reserve that will enable an extension of the Gawler River linear park. This will be of considerable benefit to the community. The removal of one regulated tree that is in poor health is considered appropriate. On balance

the proposal is considered to warrant the consent of the Assessment Panel. If you have any queries regarding this application could you please give me a call on

0402134568. Yours sincerely STIMSON CONSULTING PTY LTD

JOHN STIMSON Managing Director Enc.

Page 135 of 403

The Registrar-General certifies that this Title Register Search displays the records maintained in the RegisterBook and other notations at the time of searching.

Registrar-General

Certificate of Title - Volume 6142 Folio 80Parent Title(s) CT 5921/611

Dealing(s)Creating Title

DDA 12159703

Title Issued 25/07/2014

Edition 2

Edition Issued 15/07/2015

Estate TypeFEE SIMPLE

Registered ProprietorPHILIPPE BAYETHELEN ELIZABETH BAYET

OF 5 PENRITH AVENUE GAWLER WEST SA 5118AS JOINT TENANTS

Description of LandALLOTMENT 21 DEPOSITED PLAN 62331IN THE AREA NAMED GAWLER WESTHUNDRED OF MUDLA WIRRA

EasementsSUBJECT TO EASEMENT(S) OVER THE LAND MARKED A TO THE COUNCIL FOR THE AREA (T 3743579)

SUBJECT TO EASEMENT(S) OVER THE LAND MARKED B TO THE COUNCIL FOR THE AREA (AQ 6353470)

Schedule of DealingsDealing Number Description

7713477 AGREEMENT UNDER DEVELOPMENT ACT, 1993 PURSUANT TO SECTION 57(2) OVERPORTION

NotationsDealings Affecting Title

NIL

Product Register SearchDate/Time 11/01/2017 11:29AMCustomer Reference A002117Order ID 20170111004967Cost $27.75

Land Services Page 1 of 3Copyright Privacy Disclaimer: www.sailis.sa.gov.au/home/showCopyright www.sailis.sa.gov.au/home/showPrivacyStatement www.sailis.sa.gov.au/home/showDisclaimer

Page 136 of 403

Priority Notices

NIL

Notations on Plan

NIL

Registrar-General's Notes

NIL

Administrative Interests

NIL

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Document # - R0076-005PenStEcam PO Box 381 Prepared for the Phil and Helen Bayet Goodwood SA 5034 PO Box 1169 Ph. 08 7329 9521 Clare SA 5453 Mob. 0428 827 007 11th January 2017 E. shane@adelaidearb.com.au

Tree Report – 5 Penrith Avenue, Gawler West

Executive Summary

The tree is situated within a central location of the currently vacant residential allotment and is identified as Eucalyptus camaldulensis – River Red Gum. This tree has a trunk circumference that exceeds two metres however is less than three metres at one metre above ground level and is therefore classified as a Regulated Tree under the Development Act 1993.

The tree displays substantial health decline with reduced foliage density and a high proportion of terminal deadwood throughout the crown. Furthermore, the existing growing environment is unsuitable for sustainable tree retention and therefore alterations to the growing environment to enable tree recover is not expected to be successful.

This tree is therefore recommended to be removed due to the unmanageable health decline which is expected to deteriorate further over the coming years.

ATTACHMENT 2

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Thank you for the opportunity to provide you with this advice. Should you require any further assistance or clarification, please do not hesitate to call or email me. Yours sincerely SHANE SELWAY Senior Consulting Arboriculturist Diploma of Arboriculture International Society of Arboriculture – Certified Arborist AU-0270A

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Table of Contents

Executive Summary 1

Table of Contents 3

Brief 4

Tree and Environmental Observations 5

Tree 1 – Eucalyptus camaldulensis - River Red Gum 5

General Observations 6

Development Plan Assessment 7

Discussion 9

Recommendations 10

Site Plan 11

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Brief Adelaide Arb Consultants were commissioned by Helen Bayet to conduct a comprehensive tree assessment of the subject tree within a central aspect of the vacant allotment at 5 Penrith Avenue, Gawler West. The subject property is noted to be a residential allotment that is currently utilised for horse grazing with three trees located within the allotment. Of these three trees, only the subject tree is controlled under the current provisions of the Development Act 1993. The tree is identified as Eucalyptus camaldulensis – River Red Gum and is noted to display sustainable structural integrity however below average health and reduced Useful Life Expectancy. The assessment criteria included the following attributes:

The tree’s current health, structure and sustainability within its current environmental conditions.

The tree’s control status under the current provisions of the Development Act 1993 including an assessment against the relevant local council’s Principles of Development Control.

Crown management requirements under the current guidelines of Australian Standard AS4373-2007 Pruning of amenity trees to reduce the risk of potential branch failure and prolong the Useful Life Expectancy of the tree where possible.

Any other factors that were relevant to tree management in the situation considering development and construction activities may occur within the vicinity of the tree.

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Tree and Environmental Observations

Tree 1 – Eucalyptus camaldulensis - River Red Gum

Assessment Date

16th December 2016

GPS Location

34°36'7" S 138°43'57" E

Height 15 metres

Spread (Diameter)

12 metres

Age Over-Mature

Health Fair-Poor

Structure Fair-Good

Useful Life Expectancy

< 10 years

Right: Tree 1 viewed from the north east and within the driveway area of the existing subject allotment.

Circumference 2.68 metres

Legislative Control

The circumference of the trunk measured at one metre above ground level is greater than two metres however less than three metres. The tree is therefore classified as a Regulated Tree under the current provisions of the Development Act 1993.

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General Observations The tree is located within the northern portion of the subject vacant allotment at 5 Penrith Avenue and is marked Tree 1 on the attached site plan. The tree consists of a single trunk to three metres above ground level at which point it divides into several ascending stems and large diameter lateral branches. The trunk to this point and each ascending stem supports many radiating lateral branches with reduced foliage density to form a domed and open crown that is typical of the species with the exception of the reduced foliage density. The tree's root zone consists of open soil and dry grass areas surrounding the trunk with a compacted gravel driveway approximately eight metres north of the stem. There have been no obvious recent disturbances within this area however the land is currently being utilised for horse grazing which will be causing a minor soil erosion and compaction concerns to occur. Tree health is considered to be fair to poor. Foliage colour is noted to be dull green while size and density is reduced and abnormal of the species. A moderate proportion of small to medium diameter deadwood is notable throughout the crown which is terminally arranged and there is an above average boring insect infestation noted within the primary tree form. All of the above are indicators of environmental stress and health decline. Tree structure is considered to be fair to good. Root and trunk buttressing is well developed and this leads into good trunk and branch taper. Branch unions throughout the form are free of recognisable flaws and typical in formation for the species while lateral branches display moderate elongation with good options for future pruning management. A small cavity is notable at the northern stem buttress however no signs of fungal development or integrity loss is present at this point.

Image 1 (Right): the poor foliage density and terminal deadwood which is notable throughout the crown.

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Development Plan Assessment

Objectives

The Town of Gawler considers the conservation of Regulated Trees that provide important aesthetic and environmental benefit.

The subject tree provides low to moderate aesthetic benefit to the local area however as an indigenous species, its environmental value is important. Development should occur in balance with preserving regulated trees that demonstrate one or more of the following attributes: a) The tree does not make a significant contribution to the character or visual amenity of

the local area. The tree displays substantial health decline with an elevated proportion of terminal deadwood present as well as poor foliage density throughout the crown. Therefore, the contribution made to the character or visual amenity of the local area by the tree may be considered as a negative contribution.

b) The species is indigenous to the local area. Eucalyptus camaldulensis is indigenous to most parts of Mainland Australia.

c) The species is not listed as rare or endangered under the National Parks and Wildlife Act 1972.

d) The tree represents important habitat for native fauna. The tree is linked to the wildlife corridor created by Gawler River to the north of the property however no nesting sites or wildlife were present within the crown at the time of the assessment.

Principles of Development Control

Development should have minimum adverse effects on regulated trees. The development proposal will cause substantial adverse effects to the future sustainability of the subject tree and the tree is recommended to be removed.

A regulated tree should not be removed or damaged other than where it can be demonstrated that one or more of the following apply:

a) The tree is diseased and has a short life expectancy. The tree displays substantial health decline with poor foliage density and terminal deadwood throughout the form.

b) The tree does not represent a material risk to public or private safety.

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c) The tree is not causing damage to a building.

d) The tree is not preventing development that is reasonable and expected.

e) The work is not required for the removal of deadwood, treatment of disease and is not in the general interests of tree health.

The work recommended involves the complete removal of the tree.

Tree damaging activity other than removal should seek to maintain the aesthetic appearance and structural integrity of the tree.

The development application involves tree removal and therefore the aesthetic contribution (however limited this may be) and structural integrity of the subject tree cannot be maintained.

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Discussion

The tree is situated within a central location of the currently vacant residential allotment at 5 Penrith Avenue, Gawler West and is identified as Eucalyptus camaldulensis – River Red Gum. This tree has a trunk circumference that exceeds two metres however is less than three metres at one metre above ground level and is therefore classified as a Regulated Tree under the Development Act 1993. The health of the tree is noted to be fair to poor due to the reduced and poor foliage density of small leaf size and dull colour with a high proportion of terminal deadwood also noted throughout the crown. The boring insect infestation throughout the primary structure is also a clear indicator of environmental stress. Remedial treatments to promote tree health and prolong the trees Useful Life Expectancy may include improvements to the root development area and promote root growth. The growing environment includes open grassland with the only inhibiting factor being grazing horses. This environment is not hostile to vegetation establishment and therefore this is not expected to be the cause of tree health decline neither will soil treatments such as nutrient additives or mulch application be likely to improve tree health and sustainability for a suitable time period. The structure of the tree is notably fair to good. In the event that tree retention is required, some pruning to reduce branch extension will be required which in turn will have a negative effect to tree health and sustainability due to the futher loss of foliage density. This is not recommended and is expected to result in the tree’s demise over a reduced time frame. Giving consideration to the level of health decline displayed throughout the form of the tree, a lack of remedial treatments to promote tree health and that tree retention would require crown management which will lead to further crown loss and health decline, the tree is not likely to recover and its complete removal is recommended.

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Recommendations The removal of the subject tree is recommended for the following reasons:

The tree displays substantial health decline.

The trees’ life expectancy is short.

The level of decline is such that long-term health cannot be guaranteed.

There are no reasonable remedial treatments, development options or design solutions available to rejuvenate the tree’s health and prolong its Useful Life Expectancy.

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Site Plan

Subject Tree

5 Penrith Avenue, Gawler West

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D.Nicolle, 5 Penrith Ave Gawler West SA, 3rd Apr 2017, Euca.cama 1

CalyptraPtyLtdtradingas

DeanNicollePh.D.;B.Sc.(Hons.)Botany;B.App.Sc.(NaturalResourceManagement)

POBox808MelrosePark,SA5039Phone:0413214303Email:dn@dn.com.auWeb:www.dn.com.au

Arboriculture-Botany-Ecology-EucalyptResearch

Condensed Tree Report – 5 Penrith Avenue, Gawler West, SA

Arboricultural assessment of a regulated Eucalyptus camaldulensis (river red gum) tree

Arboricultural assessment and report requested by James Booker, Senior Development Assessment Planner at the Town of Gawler Council, on the 27th of March 2017.

Arboricultural report prepared by Dean Nicolle following a site visit and tree inspection on the 3rd of April 2017.

Report dated the 3rd of April 2017.

ATTACHMENT 3

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Figure 1. The subject tree, looking approximately south-west from the subject site.

TREE ASSESSMENT Species: Eucalyptus camaldulensis subsp. camaldulensis (river red gum). Key references: Nicolle (2016). Taller Eucalypts for Planting in Australia -

Their Selection, Cultivation and Management. Pp. 56 – 59. Nicolle (2013). Native Eucalypts of South Australia. Pp. 44 – 45. Legal status: A regulated tree as defined by the Development Act 1993. - Species: Eucalyptus camaldulensis - Trunk circ. at one metre: 2.69 metres - Distance to dwelling/pool: >20 metres from nearest dwelling/pool - Bushfire Risk: Excluded area - Living/dead status: Alive - Exemptions: No generic exemptions Current size: About 17 metres tall, average of 12 metres wide. Stem structure: Single trunk up to 2.8 metres above ground level, from where

irregularly-spaced, small- to medium-sized branches of

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medium length and of erect tending to spreading habit begins (see Figure 1).

Crown structure: Upright oval in shape, slightly sparse in density, and generally evenly weighted.

Anticipated size: Near fully-grown under the existing environmental and site conditions and considering the age, health and structure of the tree. Eventual size about 20 metres tall x 18 metres spread.

Species origin: The species is indigenous to the area, but possibly not to the

actual site (being an upland site away from nearby watercourses).

Tree origin: Either planted or of self-seeded semi-remnant origin. Biodiversity value: Moderate (a reproductively mature but sparse-crowned

specimen of a locally indigenous species; no bird-habitable hollows are evident).

Estimated age: 25 – 50 years. Actual life expectancy: Another 10 – 20+ years. Useful life expectancy: Another 10 – 20+ years. Health: Poor. The tree appears to be improving in health from a

previously poorer state of health, possibly associated with drought stress and/or severe insect damage to the foliage.

Vigour: Low. Borer activity: Moderate and past-damaging longicorn borer activity is

evident, with some cambium scaring on the trunk and at the root buttress.

Termite activity: None visibly evident. Fungal wood decay: Some active fungal wood decay is evident at an old cambium

scar at the base of the trunk. Basal structure: Well buttressed but with some cambium scaring and fungal

wood decay. Trunk structure: Ongoing longicorn borer activity and some cambium scaring. WTSF likelihood: The likelihood of Whole-of-Tree Structural Failure is currently

considered to be very low. Branch structure: Generally sound. Branches are not over-extended nor heavily

end-weighted. BF likelihood: The likelihood of Branch Failure is currently considered to be

low. Failure history: The tree has no evidence of any past significant branch failure

events. Risk to safety: Currently very low and acceptable. The risk to safety is partly

correlated to the very low under-crown use of the site.

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Tree-caused damage: No tree-caused damage to nearby structures of value is visibly evident.

Landscape value: Moderate to high. The tree is quite visible from Penrith

Avenue. ADDRESSING THE DEVELOPMENT PLAN Gawler (CT), consolidated 28 April 2016 REGULATED TREES OBJECTIVES Objective 69: The conservation of regulated trees that provide important aesthetic

and/or environmental benefit. The tree provides a moderate to high, but not an important aesthetic benefit to the

local area. The tree is quite visible from Penrith Avenue. The tree is considered to be of moderate, but not an important, environmental

benefit. Objective 70: Development in balance with preserving regulated trees that

demonstrate one or more of the following attributes:

(a) significantly contributes to the character or visual amenity of the locality; The tree provides a moderate to high, but not a significant contribution to the character and amenity of the local area. The tree is quite visible from Penrith Avenue.

(b) indigenous to the local area;

The tree is of a species that is indigenous to the local area, but possibly not to the specific site.

(c) a rare or endangered species;

The tree is of a species that is not listed as rare or endangered. (d) an important habitat for native fauna.

The tree is a reproductively mature specimen but sparse-crowned specimen of a locally indigenous species. No faunal hollow are evident. Therefore, the tree arguably represents an important habitat for native fauna.

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PRINCIPLES OF DEVELOPMENT CONTROL 208 A regulated tree should not be removed or damaged other than where it can

be demonstrated that one or more of the following apply: (a) the tree is diseased and its life expectancy is short;

The tree is not unusually diseased. The tree is in a poor state of health, but nevertheless has a Useful Life Expectancy of another 10 – 20+ years.

(b) the tree represents a material risk to public or private safety;

The tree currently represents a very low risk to safety. This risk assessment is partly associated with the very low under-crown use of the site.

(c) The tree is causing damage to a building;

The tree is not currently causing damage to a building. (d) development that is reasonable and expected would not otherwise be

possible; I have not seen the site layout plans for the proposed subdivision. In any case, I am not qualified to comment on planning issues and what may be reasonably and expected on the site.

(e) the work is required for the removal of dead wood, treatment of disease,

or is in the general interests of the health of the tree. No work is proposed regarding the removal of dead wood, treatment of disease, or is in the general interests of the health of the tree.

209 Tree damaging activity other than removal should seek to maintain the

health, aesthetic appearance and structural integrity of the tree. Not applicable (no tree-damaging activity is proposed).

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RECOMMENDATIONS The subject tree is not worthy of enforcing development constraints on the site, and I am supportive of the removal of the tree in the case of site redevelopment. I therefore recommended that the development application to remove the regulated tree, as part of a subdivision application, be approved. My support of tree removal in the case of site redevelopment is made on the basis of:

1. The marginal suitability of the species to the local environmental conditions; 2. The poor health of the tree; 3. The short to moderate life expectancy of the tree; 4. The cambium scaring and wood decay at the base of the tree; 5. The lack of any faunal hollows or other important faunal habitats in the tree;

and 6. The reduced aesthetic appeal of the tree associated with its poor health.

I thank you for the opportunity to provide this report and trust it meets your requirements. If you require further information or clarification please contact me for assistance.

Dean Nicolle Ph.D.; B.Sc.(Hons.) Botany; B.App.Sc. (Natural Resource Management).

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