bushfire attack level (bal) compliance report stage 1a ......bal rating recommended setback to...

Level 1, 50 Subiaco Square Road Subiaco WA 6008 PO Box 243 Subiaco WA 6904 Phone (08) 9380 3100 Fax (08) 9380 4606 177 Spencer Street Bunbury WA 6230 PO Box 287 Bunbury WA 6231 Phone (08) 9792 4797 Fax (08) 9792 4708

CED16321_01 M001 Rev 0 28-Feb-18 1

To: Marcus Deshon Date: 28 February 2018

Company: Cedar Woods Properties Limited Project No: CED16321.01

Fax/email: [email protected] Inquiries: Zac Cockerill

Bushfire Attack Level (BAL) Compliance Report Stage 1A Millars Landing

Site Details

Address: 72 residential lots within Stage 1A Millars LandingSuburb: Baldivis State: Western AustraliaLocal Government Area: City of RockinghamDescription of building works: Class 1a buildings with associated Class 10a buildings

Report details

Report/Job number: CED16321.01 Report version: M001 Rev 0 Assessment date: 22/02/2018 Report date: 28/02/2018 Report Review Endorsement

Z Cockerill 28/02/2018 BPAD37803 Level 2 Accredited

Introduction

This Bushfire Attack Level (BAL) compliance report has been prepared for 72 residential lots within Stage 1A Millars Landing (hereon referred to as the project area), located in Baldivis, City of Rockingham.

This report provides a post-subdivisional works update of the 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 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 therefore supersedes any previous BAL assessments undertaken within the project area, including previous BAL contour mapping contained in Bushfire Management Plans (BMPs) prepared by RUIC Fire (2017) to accompany both the Structure Planning and Stage 1A subdivision planning applications.

This BAL compliance report also takes into consideration the proposed landscaping, drainage and planting regime detail outlined in the most up to date versions of the relevant landscape concepts for POS Areas 1, 2 and 3 to account for the reintroduction of classified vegetation and associated BAL response.

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 and the report is considered suitable for the purposes of addressing Condition 16 of subdivision approval (WAPC Ref. 154840).

The BAL compliance assessment has been completed by a Level 2 accredited Bushfire Planning and Design practitioner (Zac Cockerill, BPAD37803) in accordance with Method 1 of AS 3959–2009 Construction of Buildings in Bushfire-prone Areas (AS 3959; SA 2009) and results are consistent with on-ground conditions observed at the time of inspection on 22 February 2018.

Bushfire Attack Level (BAL) Compliance Report

CED16321_01 M001 Rev 0

28-Feb-18 2

Should subdivision design or the classified vegetation extent be further modified prior to building construction, then an updated BAL contour assessment for the affected lots may need to be undertaken to account for these changes.

Updated BAL contour assessment

Results of the updated BAL contour assessment are provided in Figure 1 and a summary of assessment parameters are provided in the following subsections.

Fire Danger Index

A blanket rating of FDI 80 is adopted for Western Australian environments, as outlined in AS 3959 and endorsed by Australasian Fire and Emergency Service Authorities Council.

Classified vegetation

The spatial extent of classified vegetation and exclusions are depicted in Figure 1, along with site photo points to verify the location of classified vegetation and exclusions observed. The photo points depicted in Figure 1 relate to the georeferenced site photographs provided in Appendix 1.

Subdivisional and landscaping works have or will result in the following classified vegetation and exclusions within and adjacent to the project area:

• POS 1 situated southwest of the project area is currently excluded from classification under a combination of Clause 2.2.3.2 (b) for the central wetland area, Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• following full implementation of POS 1 landscaping works as per Appendix 2, future exclusions for POS 1 will include a combination of Clause 2.2.3.2 (b) for the central wetland area, Clause 2.2.3.2 (c) for the two small drainage basins situated either side of the central wetland area, Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• POS 2 situated northwest of the project area is currently excluded from classification under a combination of Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• following full implementation of POS 2 landscaping works as per Appendix 2, future classified vegetation for POS 2 will include Class G grassland throughout planted drainage areas and future exclusions will include a combination of Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• POS 3 situated northeast of the project area is currently excluded from classification under a combination of Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• following full implementation of POS 3 landscaping works as per Appendix 2, future classified vegetation for POS 3 will include Class G grassland throughout planted drainage areas and future exclusions will include a combination of Clause 2.2.3.2 (e) for any non-vegetated areas and Clause 2.2.3.2 (f) for any low threat managed areas

• all proposed residential lots and road reserves are in a cleared, non-vegetated state and are excluded from classification under Clause 2.2.3.2 (e)

• 100 m wide staging buffers, as documented in the RUIC (2017) BMPs, have been implemented where possible within future development areas adjacent to the project area and are excluded from classification under a combination of Clause 2.2.3.2 (e) for non-vegetated components and Clause 2.2.3.2 (f) for managed low threat components

• adjacent land to the southeast is currently Class G grassland

• following transfer of land for the purposes of road widening associated with the upgrade of the Mundijong Road/Kwinana Freeway intersection, adjacent land to the southeast will potentially comprise Class B woodland to account for potential natural establishment or replanting of vegetation (as per RUIC Fire 2017 BMPs)


CED16321_01 M001 Rev 0

28-Feb-18 3

• adjacent land to the east within the Kwinana Freeway reserve has been classified as Class D scrub

• adjacent land beyond the 100 m wide staging buffer (particularly to the north), has been classified as Class G grassland due to the unmanaged status of these areas.

Effective slope

All current and future areas of classified vegetation occur on flat land (i.e. effective slope of 0 degrees) as depicted in Figure 1. Topographic contours have also been provided on Figure 1 to support this observation.

BAL calculations

The BAL impact to the project area has been assessed in the form of BAL contours, utilising assessment results as outlined above. Results of the BAL contour assessment are outlined in Table 1 and depicted in the BAL contour map (Figure 1).

Table 1: BAL contour assessment Classified vegetation

Effective slope

Separation distance (BAL contour width) BAL rating Comment

Class B woodland

Flat land (0 degrees)

<10 m BAL–FZ No development is proposed in this area

10–<14 m BAL–40 No development is proposed in this area



29–<100 m BAL–12.5 Development will occur in this area

Class G grassland

Flat land (0 degrees)

<6 m BAL–FZ No development is proposed in this area




17–<50 m BAL–12.5 Development will occur in this area

BAL certificates

BAL certificates are provided in Appendix 3 for all 72 residential lots situated within Stage 1A Millars Landing as per the BAL contour assessment outlined in Figure 1. Where more than one BAL rating applies to a single lot, the highest (worst case) BAL rating has been applied. Should a lower BAL rating be realistically achievable through a minor building setback then the landowner can refer to detailed advice for recommended setbacks in Table 2. 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.

Table 2: Recommended setbacks to achieve a lower BAL rating

Lot number

Current separation distance to lot

boundary

Current BAL rating Recommended setback to achieve lower BAL New BAL

rating*

193 48.5 m BAL-12.5 1.5 m tapered side setback BAL-Low



*The new BAL rating in Table 2 can only be confirmed once the building plan for the relevant lot has been prepared to demonstrate compliance with the recommended setback. Once the setback has been confirmed, a new BAL certificate for the lower BAL rating can be prepared and issued to accompany the building permit application.


CED16321_01 M001 Rev 0

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Conclusion and recommendations

This BAL compliance report has been prepared for 72 residential lots within Stage 1A Millars Landing to provide a final BAL check for individual lots for use as part of subdivision clearance (Condition 16) and at the building permit stage. Assessment results are consistent with current on-ground conditions observed at time of inspection on 22 February 2018 and account for future areas of classified vegetation within POS and future road widening areas. From these results, Strategen can confirm that the existing BMPs over the site (RUIC 2017) have been implemented as intended throughout the duration of subdivisional works to achieve the bushfire management outcome as planned for in these documents.

In the absence of any change in development design or post-development classified vegetation extent that has not already been accounted for, Strategen considers that the BAL assessment and BAL certificates outlined in this report are accurate to inform individual lot building permit applications.

Should the extent of classified vegetation change or new vegetation be introduced within 100 m of proposed development that has not already been accounted for, then the BAL should be reassessed at the building permit stage to ensure accuracy with on-ground conditions.

Should it be determined through demonstration on the building plan that compliance with the recommended building setbacks has been achieved and subsequently a lower BAL rating has been achieved (as per Table 2), then the lower BAL rating should apply and be reflected in an updated BAL certificate prepared at that time.

The BAL assessment outlined in this report is the most up to date assessment relating to the project area and therefore supersedes any previous BAL assessments undertaken within the project area.

Ongoing requirements of the RUIC (2017) BMPs and current City of Rockingham annual firebreak notice should continue to be implemented as required, particularly with regards to ongoing fuel management of vacant land, POS, road reserves and APZs.

Figure 1 BAL compliance: Stage 1A Millars Landing

Path: Q:\Consult\2016\CED\CED16321\01_GIS_documents\ArcMap_documents\CED16321_G001_RevC.mxd

[email protected]

Note that positional errors may occur in some areasCoordinate System: GDA 1994 MGA Zone 50

Date: 28/02/2018Author: JCrute

at A41:4,234Scale

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264 265 266 267 268 269 270 271 272 2779001

2751 POS

Flat land Flat land

Flat land

Flat land

Flat land

Flat land

Flat land

1

2

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34

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POS 1

POS 3POS 2

POS 2

5

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0 50 100 150m

Source: Aerial image: Nearmap, flown 02/2018. Existing cadastre: Landgate 2017. Subdivision layout: Client 02/2018.

Legend!( Photo points

Photo direction

Surface elevation (mAHD)

Project area

POS

Proposed lots

Existing cadastre

100m wide assessment area

150m wide assessment area

Carriageways

Cell boundary

30m wide REW buffer

REW

Vegetation classClass B Woodland

Class D Scrub

Class G Grassland

Excluded under Clause 2.2.3.2 (b)

Excluded under Clause 2.2.3.2 (c)

BAL contoursBAL FZ

BAL 40

BAL 29

BAL 19

BAL 12.5

BAL Low

Appendix 1 Site photographs

Photo 1: Low threat managed land excluded from classification under Clause 2.2.3.2 (f) in foreground (i.e. within 100 m wide staging buffer), Class G grassland in background

Photo 2: Low threat managed land and non-vegetated land excluded from classification under Clauses 2.2.3.2 (e) and (f)

Photo 3: Low threat managed land excluded from classification under Clause 2.2.3.2 (f) in foreground (i.e. within 100 m wide staging buffer), Class G grassland in background



Photo 6: Low threat managed land and non-vegetated land excluded from classification under Clauses 2.2.3.2 (e) and (f) in foreground (i.e. within 100 m wide staging buffer), Class G grassland in background

Photo 7: Low threat managed land excluded from classification under Clause 2.2.3.2 (f)

Photo 8: Currently low threat managed land and non-vegetated land excluded from classification under Clauses 2.2.3.2 (e) and (f), future Class G grassland within POS 3

Photo 9: Non-vegetated land excluded from classification under Clause 2.2.3.2 (e)

Photo 10: Currently Class G grassland in foreground (future Class B woodland within road reserve/road widening), Class D scrub within Kwinana Freeway reserve in background

Photo 13: Low threat managed land excluded from classification under Clause 2.2.3.2 (f) right of shot, central wetland area excluded from classification under Clause 2.2.3.2 (b) left of shot

Photo 14: Low threat managed land excluded from classification under Clause 2.2.3.2 (f) left of shot, central wetland area excluded from classification under Clause 2.2.3.2 (b) right of shot

Photo 15: Low threat managed land excluded from classification under Clause 2.2.3.2 (f) in foreground, central wetland area excluded from classification under Clause 2.2.3.2 (b) in background

Appendix 2 POS landscape concept plans

N O R T H B A L D I V I S P O S 1

L A N D S C A P E C O N C E P T P L A N

P R E P A R E D F O R C E D A R W O O D S

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L A N D S C A P E A R C H I T E C T SL A N D S C A P E A R C H I T E C T S4 1 4 R O K E B Y R D S U B I A C O W A 6 0 0 8T : ( 0 8 ) 9 3 8 8 9 5 6 6 E : m a i l @ p l a n e . c o m . a uL A N D S P A C E P T Y L T D A C N 0 5 6 5 3 8 6 7 9COPYRIGHT This document i s and sha l l rema in the property o f P lan E

EX

TE

NT

OF

S IT

E

EXTENT OF S ITE

FEATURE SHADE STRUCTURE

FORMAL PARK ENTRY

SHADE SHELTER OVERLOOKING REW WETLANDWITH BOARDWALK.

CONCRETE FOOTPATHS

FEATURE PLAYGROUND WITH INDICATIVE LAYOUT PROVIDED

SHADE STRUCTURE & BARBECUE

MANAGED LANDSCAPE PLANTING OF LOW SHRUBS AND GROUNDCOVERS



MANAGED LANDSCAPE PLANTING OF LOW SHRUBS

AND GROUNDCOVERS

TIMBER BOARDWALK TO PATH CROSSINGS

WETLAND BUFFER PLANTING. REEDS AND SEDGES

1.5M GRAVEL MAINTENANCE STRIP

MANAGED LOW WETLAND GROUNDCOVER PLANTING @ 100MM HIGH WITH GRAVEL MULCH

RESOURCE ENHANCEMENT WETLAND

EXISTING VEGETATION TO BE RETAINED & PROTECTED

1 : 5 YR DRAINAGE

REW = 8720m 2

REW + PLANTED BUFFER = 99975m2

1 : 1 YR BASIN560m 2

1 : 1 YR BASIN860m 2

TURFKICKABOUT

AREA

REW

RESOURCE ENHANCEMENT WETLAND PLANTED WITH

NATIVE REEDS AND SEDGES

FUTURE 1:1 YEAR BASIN, PLANTED WITH APPROPRIATE NATIVE REEDS AND SEDGES

DRAINAGE OVERFLOW TO REW.

TURF

TURF

TURF

26m

27.5m

TURF

+5.60

+5.60

+RL5.10

+RL5.10

TURF

TURF

TURFTURF

DRAINAGE OVERFLOW TO REW.

1:1 YEAR BASIN, PLANTED WITH APPROPRIATE NATIVE REEDS AND SEDGES

BOARDWALK THROUGH EXISTING VEGETATION.

BOARDWALK THROUGH EXISTING VEGETATION.

A

B

A

B

+5.60

+5.60

EXTENT OF S ITE

TURF

TURF

TURF

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COPYRIGHT This document i s and sha l l rema in the property o f P lan E

SHADE STRUCTURE

BOARDWALK

13M MIN OFFSET

CONCRETE FOOTPATHS

FULLY IRRIGATED GARDEN BED

TURF

TURF

TURF TURF MAX 1:6

TURF MAX 1:6

1:1 YEAR BASIN, PLANTED WITH APPROPRIATE NATIVE

REEDS AND SEDGES1:1 TOP WATER LEVEL 5.75

1:1 BASE LEVEL 5.40

AGGREGATE MULCH WITH SPARSE PLANTING TO BASE OF CONVEYANCE SWALE WHERE LOCATED WITHIN FIRE SEPARATION ZONE

Conveyance Swale5 Year ARI (20% AEP)Volume detained (m3) 38Maximum depth (m) 0.21TWL (m AHD) 5.21Inundated Area (m2) 396

100 Year ARI (1% AEP)Volume detained (m3) 274Maximum depth (m) 0.56TWL (m AHD) 5.56Inundated Area (m2) 947

Bio Retent ion bas in1 Year ARIVolume detained (m3) 103Maximum depth (m) 0.35TWL (m AHD) 5.75Inundated Area (m2) 295

STONE PITCHED 1:1 BASIN OVERFLOW

LEVEL 5.75

BC

BC

EXTENT OF WORKS/SITE

EXTENT OF WORKS/SITE

13M MIN OFFSET

EXTE

NT

OF

WO

RK

S/SI

TE

+ 5 .00

EXISTING TREES POTENTIALLY SUITABLE FOR RETENTION PENDING ASSESSMENT

BY A QUALIFIED ARBORIST

FUTURE FOOTPATH CONNECTIONS

EXISTING TREES POTENTIALLY SUITABLE FOR RETENTION PENDING ASSESSMENT BY A QUALIFIED ARBORIST

RL 5.33

RL 5.35

RL 5.15

RL 5.19RL 5.05

RL 5.06

RL 5.28RL 5.30

RL 5.35

RL 5.49

RL 5.67

+ 5.15

+ 5.65

+ 5.65

+ TW 5.60+ BW 5.10

+ TW 5.95

EXTENT OF S ITE

TURF

TURF

TURF

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TURF

TURF

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L A N D S C A P E A R C H I T E C T SL A N D S C A P E A R C H I T E C T S4 1 4 R O K E B Y R D S U B I A C O W A 6 0 0 8T : ( 0 8 ) 9 3 8 8 9 5 6 6 E : m a i l @ p l a n e . c o m . a uL A N D S P A C E P T Y L T D A C N 0 5 6 5 3 8 6 7 9

COPYRIGHT This document i s and sha l l rema in the property o f P lan E

SHADE STRUCTURE SEATING NODE OVERLOOKING TURF AND BASIN

FUTURE BASIN

FUTURE BASIN

FUTURE BASIN

BOARDWALK

EXISTING TREES TO BE RETAINED

CONCRETE FOOTPATHS

FULLY IRRIGATED GARDEN BED

TURF

1:100 CONVEYANCE SWALE PLANTED WITH

APPROPRIATE NATIVE REEDS AND SEDGES

TWL 4.90STONE PITCHED 1:1 BASIN OVERFLOW LEVEL 5.00

MANAGED LOW WETLAND GROUNDCOVER PLANTING @ 100MM HIGH WITH GRAVEL MULCH

DD

EXTENT OF WORKS/SITEE

XT

EN

T O

F W

OR

KS

/SIT

E

1 :1 YR BASIN PLANTED WITH APPROPRIATE NATIVE REEDS AND SEDGES1:1 TOP WATER LEVEL 5.201:1 BASE LEVEL 4.80

6.00 +

+ 3.90

+ 6.00 + 6.00

+ 5.80

+ 3.80 + 3.70

bushfire attack level (bal) compliance report stage 1a ......bal rating recommended setback to...

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