Stages 4A, 4B and 6 Bushmead · 3. Bushfire assessment results 3.1 Assessment inputs 3.1.1 Vegetation classification Strategen assessed classified vegetation and exclusions within

Stages 4A, 4B and 6 Bushmead

Bushfire Management Plan Compliance Report

Prepared for Cedar Woods Properties Limited by Strategen July 2019


Bushfire Management Plan Compliance Report

Strategen is a trading name of Strategen Environmental Consultants Pty Ltd Level 1, 50 Subiaco Square Road Subiaco WA 6008 ACN: 056 190 419 July 2019

Limitations Scope of services This report (“the report”) has been prepared by Strategen Environmental Consultants Pty Ltd (Strategen) in accordance with the scope of services set out in the contract, or as otherwise agreed, between the Client and Strategen. In some circumstances, a range of factors such as time, budget, access and/or site disturbance constraints may have limited the scope of services. This report is strictly limited to the matters stated in it and is not to be read as extending, by implication, to any other matter in connection with the matters addressed in it.

Reliance on data In preparing the report, Strategen has relied upon data and other information provided by the Client and other individuals and organisations, most of which are referred to in the report (“the data”). Except as otherwise expressly stated in the report, Strategen has not verified the accuracy or completeness of the data. To the extent that the statements, opinions, facts, information, conclusions and/or recommendations in the report (“conclusions”) are based in whole or part on the data, those conclusions are contingent upon the accuracy and completeness of the data. Strategen has also not attempted to determine whether any material matter has been omitted from the data. Strategen will not be liable in relation to incorrect conclusions should any data, information or condition be incorrect or have been concealed, withheld, misrepresented or otherwise not fully disclosed to Strategen. The making of any assumption does not imply that Strategen has made any enquiry to verify the correctness of that assumption. The report is based on conditions encountered and information received at the time of preparation of this report or the time that site investigations were carried out. Strategen disclaims responsibility for any changes that may have occurred after this time. This report and any legal issues arising from it are governed by and construed in accordance with the law of Western Australia as at the date of this report.

Environmental conclusions Within the limitations imposed by the scope of services, the preparation of this report has been undertaken and performed in a professional manner, in accordance with generally accepted environmental consulting practices. No other warranty, whether express or implied, is made.

Document control

Client: Cedar Woods Properties Limited

Report Version Revision No. Purpose Strategen author Strategen

reviewer Submitted to Client

Form Date Final Report Rev A For client

review Brodie

Mastrangelo (BPAD 45985,

Level 1)

Zac Cockerill (BPAD 37803,

Level 2)

Electronic (email)

10/07/2019

Filename: CED19314_01 R001 Rev A - 10 July 2019

Table of Contents

CED19314_01 R001 Rev A 10-Jul-19

Table of contents 1. Introduction 1

1.1 Site/development summary 1 1.2 Purpose of report 1

2. Implementation of relevant bushfire management measures 2 3. Bushfire assessment results 3

3.1 Assessment inputs 3 3.1.1 Vegetation classification 3 3.1.2 Effective slope 3 3.1.3 Summary of inputs 3

3.2 Assessment outputs 5 3.2.1 Bushfire Attack Level (BAL) contour assessment 5 3.2.2 BAL certificates 8

4. Conclusion and recommendations 10 5. References 11

List of tables Table 1: Development summary 1 Table 2: Bushfire compliance table 2 Table 2: Summary of vegetation classifications, exclusions and effective slope 3 Table 3: BAL contour assessment results 5

List of figures Figure 1: Vegetation classification and effective slope 4 Figure 2: BAL contour map 9

List of appendices Appendix 1 BAL certificates Appendix 2 Vegetation plot photos and description Appendix 3 Water reticulation plans for Stages 4A, 4B and 6 Appendix 4 Roads plans for Stages 4A, 4B and 6 Appendix 5 Stage 6 Emergency Access Way alignment Appendix 6 Landscape plans


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1. Introduction

1.1 Site/development summary Table 1 provides a summary of the site and proposed development. The development layout and subject lots are shown in Figure 1 and Figure 2.

Table 1: Development summary Site details

Address details 112 lots within Stages 4A, 4B and 6 Bushmead Local government area City of Swan Description of building works Construction of a single residential dwelling (Class 1a building and

associated Class 10a structures) within each lot

1.2 Purpose of report This Bushfire Attack Level (BAL) compliance report has been prepared for 112 residential lots within Stages 4A, 4B and 6 Bushmead Estate (hereafter referred to as the project area). Lots within Stages 4A, 4B and 6 are subject to WAPC subdivision approval (WAPC Ref. 157337), issued on 26 October 2018.

This report provides a post-subdivisional works update of the Bushfire Attack Level (BAL) ratings for individual lots within the project area and has been prepared for the benefit of the developer, future lot purchasers and decision makers. BAL certificates for each individual lot within Stages 4A and 6 only (total of 76 residential lots, contained in Appendix 1) have been prepared based on the final site compliance check and are appended to this report for use at the building permit stage.

The BAL assessment outlined in this report is the most up to date assessment relating to the project area and has been prepared in consideration of the previous BAL contour assessment documented in the Bushfire Management Plan (BMP) prepared to accompany the subdivision application stage of the development (Strategen 2018, Ref: CED18414_01 R001 Rev 0). The approach for preparation of this BAL compliance report is consistent with Section 4.2 and Appendix 3 of Guidelines for Planning in Bushfire Prone Areas (the Guidelines; WAPC 2017).


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2. Implementation of relevant bushfire management measures The endorsed BMP includes several bushfire management strategies that are inherent to the ability for the residential lots to achieve the BAL ratings shown indicatively on the original BAL Contour Map. Strategen can confirm that the following relevant bushfire management strategies detailed in the endorsed BMP have been implemented as intended throughout the duration of subdivisional works. Table 2 provides a summary of the implemented works.

Table 2: Bushfire compliance table BMP reference Action Implementation status Evidence of

compliance Compliant/ non-compliant

Refer to Section 5.1

Construct the public roads and reticulated water supply/hydrants to the standard stated in the endorsed BMP.

Service alignments for proposed public roads and reticulated water are under construction.

Refer to approved water reticulation plans in (see Appendix 3) and road plans (see Appendix 4).

Compliant


Implement and maintain the 100 m wide low threat staging buffer to the west and around all proposed stages to the dimensions and standard state in the endorsed BMP.

The 100 m wide staging buffer has been established as per the BMP to meet the APZ standards.

Refer to Figure 2 and site photographs in Appendix 2.

Compliant


Comply with the City of Swan Fire Break Notice issued under Section 33 of the Bush Fires Act 1954.

All land within and adjacent to the proposed lots is compliant with the firebreak notice.

Grass/weeds maintained to a height of no greater than 5 cm (see Plot 5 photos in Appendix 2). The 20 m wide APZs required under the firebreak notice are achieved through surrounding low threat POS, road reserves and the 100 m wide staging buffer.

Compliant


Maintain the project area to ensure that it is excluded under Clauses 2.2.3.2 (e) or (f), including individual lots, road reserves, POS and any associated APZs.

All land on-site and surrounding road reserves and POS are currently being managed in a low threat state. Proposed POS will be designed, landscaped and managed to a low threat state.

Refer to site photographs in Appendix 2 and POS landscape plans contained in Appendix 6.

Compliant


Construction of temporary Emergency Access Ways to address access issues associated with staging of development.

The proposed alignment for the temporary EAW linking Stage 6 to Ashgrove entrance is currently under construction.

Refer to Appendix 5 for the approved EAW alignment.

Compliant


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3. Bushfire assessment results

3.1 Assessment inputs

3.1.1 Vegetation classification

Strategen assessed classified vegetation and exclusions within the 150 m assessment area through on-ground verification on 19 June 2019 in accordance with AS 3959—2018 Construction of Buildings in Bushfire-Prone Areas (AS 3959; SA 2018) and the Visual Guide for Bushfire Risk Assessment in Western Australia (DoP 2016). Georeferenced site photos and a description of the vegetation classifications and exclusions are contained in Appendix 2.

Site observations show that the vegetation classifications align with the post-development vegetation classifications determined by the endorsed BMP (Strategen 2018), including:

• Class B woodland northwest, west, south and east of the project area • Class A forest west of Stage 6 • Class D scrub west of Stage 6 • land excluded from classification under Clause 2.2.3.2 (e) and (f), including non-vegetated or

managed in a low threat state throughout all cleared/earthworked areas (i.e. within the project area and adjacent low threat staging buffer).

3.1.2 Effective slope

Strategen assessed effective slope under classified vegetation within the 150 m assessment area through on-ground verification on 19 June 2019 in accordance with AS 3959. Results were cross-referenced with DPIRD 2 m contour data. Site observations show that effective slope under the classified vegetation aligns with the effective slopes identified within the endorsed BMP (Strategen 2018).

Site observations confirm that the project area is generally flat. Topographic elevation across the project area ranges from approximately 30 m Australian Height Datum (mAHD) in the north to approximately 35 mAHD in the south. Effective slope under classified vegetation is down-slope >0–5 degrees to the east of the project area in relation to Kadina Brook foreshore reserve and either flat land or up-slope to the south, west and north of the project area.

3.1.3 Summary of inputs

Figure 1 illustrates the current post-development vegetation classifications and exclusions observed during the inspection. The vegetation classifications/exclusions and effective slope are summarised in Table 2.

Table 3: Summary of vegetation classifications, exclusions and effective slope Vegetation

plot Vegetation classification Effective slope Comments

1 Class A Forest Flat/upslope (0°) West of Stage 6

2 Class B Woodland Flat/upslope (0°) Northwest and west of Stages 4A and 4B, southwest of Stage 6

3 Class B Woodland Downslope >0–5° East of Stage 6

4 Class D Scrub Flat/upslope (0°) West of Stage 6

5 Excluded – Non-vegetated & Low threat (Clauses 2.2.3.2 [e] and [f])

N/A Non-vegetated and low threat areas including staging buffers, road reserves, buildings, low threat POS, cleared vacant lots

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ZJob No: 56648

Client: JBS&G Australia

Version: FINALDrawn By: CT Date: 10‐Jul‐2019Checked By: BM

Scale at A3

Coord. Sys. GDA 1994 MGA Zone 50

FIGURE: 1

0 100

metres

Project area100m assessment area150m assessment areaKadina Brook foreshore reserve100m wide low threat staging bufferCadastre

Stage boundarySubject lotsIndicative lot layout

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Photo point and direction

Document Path: W:\Strategen\GIS\Consult\2019\CED\CED19314\01_GIS_documents\ArcMap_documents\CED19314_G003_RevA.mxd

Image Reference Nearmap Imagery flown 05/2019.

Lot 9002 Leeuwin Boulevard,Hazelmere

VEGETATION CLASSIFICATIONAND EFFECTIVE SLOPE

1:4,750

Legend:

Vegetation class

Class A ForestClass B WoodlandClass D ScrubArea to be modified to low threat stateExcluded under Clauses 2.2.3.2 (e) and (f)


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3.2 Assessment outputs

3.2.1 Bushfire Attack Level (BAL) contour assessment

Strategen has undertaken a BAL contour assessment in accordance with Method 1 of AS 3959 for the project area (Figure 2). The Method 1 procedure incorporates the following factors:

• state-adopted FDI 80 rating • vegetation classification • effective slope • distance maintained between proposed development areas and the classified vegetation.

The BAL contours are based on the current on-ground site conditions and take into consideration the bushfire management measures that have been implemented on site as listed in Table 2.

Results of the BAL contour assessment are detailed in Table 3 and illustrated in Figure 2. Where applicable, Table 3 recommends building setbacks for future buildings to achieve a lower BAL.

Table 4: BAL contour assessment results Method 1 BAL determination

Lot Vegetation Plot

Vegetation classification Effective slope Separation

distance Highest

BAL

Setback required to

achieve lower BAL

Potential modified

BAL^

299 Plot 3 Class B Woodland

Downslope >0–5° 37 m BAL–12.5 N/A N/A






Downslope >0–5° 20 m BAL–29 5 m BAL–19


























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Method 1 BAL determination

Lot Vegetation Plot


distance Highest

BAL

Setback required to

achieve lower BAL

Potential modified

BAL^























326 Plot 4 Class D Scrub Flat/upslope (0°) 34 m BAL–12.5 N/A N/A


























Downslope >0–5° 108 m BAL–Low N/A N/A


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Lot Vegetation Plot


distance Highest

BAL

Setback required to

achieve lower BAL

Potential modified

BAL^






Downslope >0–5° 105.5 m BAL–Low N/A N/A















Flat/upslope (0°) 178 m BAL–Low N/A N/A






























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Lot Vegetation Plot


distance Highest

BAL

Setback required to

achieve lower BAL

Potential modified

BAL^



















^ The modified BAL can only be confirmed once the building plan for the relevant lot has been prepared to demonstrate compliance with the recommended setback.

3.2.2 BAL certificates

BAL certificates for the 76 lots within Stages 4A and 6 are provided in Appendix 2 in accordance with the BAL contour assessment results detailed in Table 3 and Figure 2.

Should a lower BAL rating be realistically achievable through an appropriate building setback, then the landowner can refer to the recommended setbacks listed in Table 3. The lower BAL rating may be achieved if the recommended building setback is reflected on the building plan for that lot and a revised BAL certificate can be issued at that time. BAL certificates for Stage 4B will be prepared at a date closer to the release of these lots to the public.

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ZJob No: 56648

Client: JBS&G Australia

Version: FINALDrawn By: CT Date: 10‐Jul‐2019Checked By: BM

Scale at A3

Coord. Sys. GDA 1994 MGA Zone 50

FIGURE: 2

0 100

metres

Project area100m assessment area150m assessment areaExisting cadastre

Kadina Brook foreshore reserve100m wide low threat staging buffer

Classified vegetationExisting and proposed 20m wide APZ

Stage boundarySubject lotsIndicative lot layout

Document Path: W:\Strategen\GIS\Consult\2019\CED\CED19314\01_GIS_documents\ArcMap_documents\CED19314_G002_RevA.mxd

Image Reference Nearmap Imagery flown 05/2019.

Lot 9002 Leeuwin Boulevard,Hazelmere

STAGES 4A, 4B AND 6 BUSHMEAD ESTATEBMP COMPLIANCE: BAL CONTOUR MAP

1:4,750

Legend:

BAL contours

BAL FZBAL 40BAL 29BAL 19BAL 12.5

BAL Low


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4. Conclusion and recommendations This BAL compliance report has been prepared for 112 residential lots within Stages 4A, 4B and 6 Bushmead Estate to provide a final BAL check for individual lots for use at the building permit stage. Assessment results are consistent with current on-ground conditions. Strategen can confirm that the endorsed BMP over the site has been implemented as intended throughout the duration of subdivisional works for the relevant Stage 4A, 4B and 6 areas and adjacent land to achieve the BAL outcomes as planned for in this document.

Should it be determined through demonstration on individual building plans that compliance with the recommended building setbacks has been achieved and subsequently a lower BAL rating has been attained (as per Table 3), then the lower BAL rating should apply and be reflected in an updated BAL certificate prepared at that time.

Ongoing requirements of the current City of Swan annual firebreak notice should continue to be implemented as required, particularly with regards to ongoing fuel management of vacant land and road reserves.


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5. References Department of Fire and Emergency Services (DFES) 2019, Map of Bush Fire Prone Areas, [Online],

Government of Western Australia, available from: https://maps.slip.wa.gov.au/landgate/bushfireprone/, [13/06/2019].

Department of Planning (DoP) 2016, Visual guide for bushfire risk assessment in Western Australia, Department of Planning, Perth.

Standards Australia (SA) 2018, Australian Standard AS 3959–2018 Construction of Buildings in Bushfire-prone Areas, Standards Australia, Sydney.

Strategen Environmental (Strategen), Bushfire Management Plan Stages 4, 5, 6A and 6B Bushmead Estate, Bushmead, report prepared for Cedar Woods, October 2018.

Western Australian Planning Commission (WAPC) 2017, Guidelines for Planning in Bushfire Prone Areas, Version 1.3 August 2017, Western Australian Planning Commission, Perth.

Documents

Stages 4A, 4B and 6 Bushmead · 3. Bushfire assessment results 3.1 Assessment inputs 3.1.1 Vegetation classification Strategen assessed classified vegetation and exclusions within