Bushfire Hazard Assessment & Management Plan v4 - 7 Triller Court, Pomona

Bushfire Hazard Assessment & Management Plan v4                                  NCES REF: J000841
Lot 4 on SP320405 – 7 Triller Court, Pomona



therefore to be available t the frontage of Lots 4-6 and the extents of the APZ on Lot 7 are
considered trafficable by a QFES yellow truck given the gentle grades present therein.
The proposed shared access easement is bordered to the south by a low threat area
consisting of existing cleared residential development, therefore the risk of access/egress
becoming constrained during a bushfire event is low. The driveway also directs
traffic/occupants in an easterly direction away from the most likely risk of a fire front approach
being from the north to north-west. Given the shared driveway length of up to 90m it is
recommended a passing bay be installed approximately halfway along to enable vehicles to
navigate past each other during an emergency as well as on a day to day basis.
To ensure suitable access design for emergency purposes it is recommended the road design
satisfy the QLD QFES Fire Hydrant and Vehicle Access Guidelines for Residential
Commercial and Industrial Lots 03/2019 ( refer Appendix 2). Particular attention is to be paid
to cleared widths both laterally and vertically and suitable turnaround areas for QFES MRV’s.
The proposed new road and shared easement is immediately flanked by open forest
vegetation which represents risk of limb fallout blocking or constraining access to and or
egress from the proposed new Lots during a bushfire event. It is therefore recommended the
trees overhanging the northern boundary of the new road and shared access easement be
assessed by a qualified minimum Level 5 arborist and any identified necessary remedial works
be undertaken to remove large dead wood and hazardous limbs prior to plan sealing.
Vehicular access to the southern APZ’s on Lots 4-6 is not proposed. Slopes present therein
are moderate and construction of a trafficable firebreak trail would require extensive landform
modification, which may impact the root zones of the adjacent ecologically important open
forest. The layout deliberately incorporates a minimum 2m side boundary setback on at least
one side boundary of each lot which offers direct emergency services pedestrian access to
the rear of the lots. Whilst the proximity of the building envelopes to the forest hazard to the
south satisfies the applicable SPP APZ separation requirements (i.e., <29kW/m² RHF), it is
evident that QFES operational officers would be unlikely to attempt to defend a forest fire from
such close proximity to the fire front, noting that radiant heat in excess of 3-4kW/m² is
considered the upper safe working exposure threshold for a fire fighter in full firefighting PPE
kit. To ensure unimpeded access is available along the respective side boundaries a
pedestrian gate is to be incorporated into any fenceline which extends from the side boundary
to the dwelling. Any such gate is to remain readily openable by emergency services officers
without the need for a key or combination pin.

5.6 Landscaping and Regrowth
Existing and future landscaping within the site should avoid increasing the potential for
bushfire hazard. Assessment Benchmark 5 of the SPP Bushfire 2019 seeks that the site layout
places the landscape and open spaces within the site between premises and adjacent mapped
medium, high or very high potential bushfire intensity areas. This landscaping and open space
comprises protective landscape treatments that:
1. Comprise only low threat vegetation (for example grassland managed in a minimal fuel
condition, maintained lawns, golf courses and cultivated gardens); or
2. Are designed to ensure a potential available fuel load is maintained at less than 8
tonnes/hectare in aggregate and with a fuel structure that remains discontinuous.
To reduce the potential for bushfire impact to buildings, structures and occupants as a result
of future regrowth and landscaping works within the site, it is recommended:
    •    Any landscaping within the nominated APZ’s satisfies Assessment Benchmark 5 of the
         SPP Bushfire 2019, including the low threat vegetation criteria prescribed in section
         2.2.3.2 of AS 3959:2018 or later iterations thereof;
    •    No woody mulch is used within 2m of buildings;
    •    No trees or large shrubs are retained within 6m of the buildings;
    •    Beyond 6m, any trees desired to be retained are to be continuously defoliated below



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