2008/0169 Response to information request - 71 Seaview Tce Sunshine Beach · 132008.169

    i.   The development will achieve a no net worsening in runoff via the detention of post-development
         flows in a series of underground storage tanks with a capacity of up to 60kL;
   ii.   No direct discharge of stormwater (treated/untreated) to wetland areas. All tank discharge points at
         least 50m from wetland areas and via areas of areas of native vegetation/ rehabilitation;
  iii.   Scour protection and energy dissipaters will be installed at all stormwater outlets in areas of
         retained/rehabilitated native vegetation to reduce the likelihood of erosion; and,
  iv.    Stormwater from driveway impervious areas will be treated via a Gross Pollutant Trap prior to
         discharge into areas of native vegetation at least 100m from wetland areas (Fox Environmental
         Systems: Baffled Gross Pollutant Trap - Model BPT600 (or approved equivalent). The GPT is expected
         to capture silt, organic matter, floating debris and hydrocarbons attached to suspended solids.


The measures outlined in the above plans are greater than typically required for a domestic residence and
reflect the environmental qualities and constraints of the site.

Even in the absence of detailed information on groundwater inflows, the proposed development manages
impacts on surface runoff and quality to mitigate potential impacts on downstream wetlands. Retention of
native vegetation and rehabilitation of disturbed areas are proposed as part of a natural buffer between the
house and downstream wetlands.




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