Meeting papers

                                                    reduction in total suspended solids, 60%
                                                    reduction in total phosphorous, 45% reduction
                                                    in total nitrogen and 90% reduction in gross
                                                    pollutants >5mm).

 Assessment
 The subject site is mapped as being an MSES high ecological significance wetland and MSES
 declared High Ecological Value (HEV) waters (wetland) under the Biodiversity, Waterways and
 Wetlands Overlay. The application material has not addressed these aspects of the site in
 relation to stormwater management, nor how the development will prevent any direct or indirect
 impacts to this ecologically important area. Development should protect the physical and
 ecological integrity and biodiversity of the ecologically important areas through protection of
 terrestrial habitat and existing riparian, waterway and wetland habitat areas.
 The Stormwater Management Plan (SMMP) provided with the application material proposes to
 achieve AO6.1 and AO6.2 by the provision of a rainwater tank for each cabin, plus the provision
 of a bioretention basin (ie stormwater treatment device), which would receive runoff from the
 carpark and also the rainwater tank overflows from the cabins. Council’s stormwater
 management consultant has raised concerns with the methodology used in the SMP to
 demonstrate compliance with the AO’s. Council’s stormwater consultant has rerun the modelling
 and estimates that the bioretention basin would be required to triple in size to that which is
 currently proposed, in order to achieve the required stormwater treatment targets, stating:
       The revised model also shows increased pollutant loads compared to pre-development
       conditions, and also the minimum pollutant load reductions required will not be achieved.
       This demonstrates quantitatively that developing a forested land parcel adjacent to a HEV
       waterway is unsustainable and will result in a worsening of off-site water quality, even
       when fairly extreme measures, which go well beyond normal practice, are employed. As
       such, PO6 of the Water Quality and Drainage Code is not achieved.
       It is considered that the stormwater quality issues are not able to be conditioned to achieve
       compliance with the scheme.
 Stormwater treatment is critical for the protection of downstream receiving waters and without a
 finalised design that Council can be sure meets the water quality reduction targets, sufficient
 evidence has not been provided to confirm that the development can achieve the protection of
 biodiversity areas on and adjacent to the site as required under the planning scheme. The
 proposal therefore has not provided evidence of compliance with PO6.
 Additionally, it is noted that the requirement to triple the size of the bioretention basin has the
 potential to increase the total number of native trees/koala habitat required to be removed.
 Without knowing the total area and location required for this device, the total number of additional
 trees to be removed cannot be accurately quantified.


BUSHFIRE HAZARD OVERLAY
The subject site is mapped as containing High Potential Bushfire Intensity and Potential Impact
Buffer under the Bushfire Hazard Overlay (refer to Figure 19). The area of mapped high potential
bushfire intensity coincides with the mapped area of biodiversity significance under the
Biodiversity, Waterways and Wetlands Overlay.




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