RESPONSE TO SARA IR - Attachment 1A - RFA24-059-SARA IR Response 310725

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    8. This will result in the loss of 166.03 sq.m. of Category B regulated vegetation (green
       polygon). This additional clearing may be included within what is defined as a firebreak as
       part of the MCU under the State Code 16.
    9. However, we further note that the fact sheet provides with the following clarification with
       respect to a necessary firebreak or necessary fire management line. The fact sheet states
       in reference to what is necessary clearing “Landholders intending to operate under this
       exemption may only clear firebreaks and fire management lines where they are necessary
       to protect lives and property”.
    10. Therefore, the necessary clearing is only that which is required to provide an acceptable
        level of bushfire risk for the proposed development.
    11. The State Planning Policy, Natural Hazards, Risk and Resilience Technical Guideline
        indicates that an acceptable risk as achieve a Radiant Heat Flux of no greater than
        29kW/m2.
    12. The minimal separation distance that achieves a Radiant Heat Flux of 29kW/m2 is
        calculated using the Flamesol Method 2 minimal distance calculator with the local input
        values for the FFDI and attributed fuel load values for the mapped Vegetation Hazard
        Class. Table 1 below provides the minimal distance calculation that achieves the Radiant
        heat flux value of 29kW/m2.
Table 1 – Minimal distance Calculation
Doonan Waste Management Facility - Minimum Distance Calculator - AS3959-2018 (Method 2)
(Calculated July 25, 2025, 4:39 pm (MDc v.4.9))
               Inputs                                            Outputs
Fire Danger Index       48          Rate of spread                1.25 km/h
Vegetation              Forest      Flame length                  11.04 m
Classification
Understorey fuel load   21 t/ha     Flame angle                   53.5 °, 63.5 °, 72.5 °, 77.5 °, 78.5 ° &
                                                                  84.5 °
Total fuel load         24.2 t/ha   Elevation of receiver         4.35 m, 4.83 m, 5.1 m, 5.16 m, 5.13 m
                                                                  & 4.79 m
Vegetation height       n/a         Fire intensity                15,654 kW/m
Effective slope         .5 °        Transmissivity                0.879, 0.863, 0.841, 0.816, 0.803 &
                                                                  0.736
Site slope              .5 °        Viewfactor                    0.5971, 0.4385, 0.2966, 0.2007,
                                                                  0.1633 & 0.0445
Flame width             100 m       Minimum distance to < 40      9.1 m
                                    kW/m²
Windspeed               n/a         Minimum distance to < 29                      12.4 m
                                    kW/m²
Heat of combustion      18,600      Minimum distance to < 19                      18.2 m
                        kJ/kg       kW/m²
Flame temperature       1,090 K     Minimum distance to < 12.5                    26.3 m
                                    kW/m²
                                    Minimum distance to < 10                      31.5 m
                                    kW/m²
Rate of Spread - Mcarthur, 1973 & Noble et al., 1980
Flame length - NSW Rural Fire Service, 2001 & Noble et al., 1980