Request for Further Information - 010.2008.00001128.001 [As Published] · 132008.1128

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25.   The Cardno Engineering Report (24 June 2008) indicates that rain water tanks will only be
      incorporated into the “Residential Unit Dwellings” within the proposed development. Drawing
      238301-SK01 only refers to “Residential Aged Care” and “Independent Living Units”. Please
      advise whether the reference to “Residential Unit Dwellings” applies to “Independent Living
      Units” as shown on Drawing 238301-SK01 and advise of any proposed water reuse to be
      incorporated into the “Residential Aged Care” component of the development.
26.   Demonstrate that rainwater tanks will comply with the Queensland Development Code.
Earthworks
27.   Indicate on a plan the footprint of earthworks including the location of batters and banks
      required for construction.
Stormwater Modelling
28.   Council does not accept stormwater modelling based on rainfall data from Nambour – which is
      located within a separate locality and catchment from the site. Council requires the stormwater
      modelling to be re-run using site specific rainfall data.
29.   Provide details on the infiltration rates of soils underlying the bioretention basin and provide
      comment whether sealing of the bioretention basin is required.
30.   Provide an indicative maintenance program for the bioretention basins. The plan must include
      details of access requirements.
31.   Advise whether the impact of earthworks (i.e. changed site contours) and rainwater tanks has
      been taken into account within the stormwater modelling presented in the Cardno Engineering
      Report (24 June 2008).
32.   There is inconsistency (due to rounding error) associated with the capacity of the bioretention
      basins shown on Drawing 238301-SK02 and page 12 of the Cardno Engineering Report (24
      June 2008). Council requests confirmation that early rounding of figures has not led to
      inaccuracy of calculations.
33.   Provide comment on the suitability of the 0.3m freeboard within the Lot 1 bioretention basin –
      or otherwise resize the basin appropriately.
34.   Advise the anticipated pH range of water leaving the site following stormwater treatment.
35.   Council requires certification from a RPEQ that the proposed stormwater design will achieve
      the required runoff velocities and water quality objectives.
36.   In order to better integrate Water Sensitive Urban Design into the proposed development,
      consider integration of multiple stormwater quality improvement devices throughout the
      development design.
37.   Overland flow paths are necessary in the event of a failure of the constructed stormwater
      network. Consider integration of overland stormwater flow paths into the design.
38.   Council is concerned that the 1:2 batters on the spreader channel are too steep and may be
      unstable and / or result in scouring during periods of high flow. Provide comment regarding the
      suitability of the proposed batter grade.
39.   Advise of the intent to include grease and oil arrestors within the design.
40.   Please provide a preliminary stormwater management plan for drainage of basements. Within
      that preliminary plan demonstrate that all basements can drain by gravity means, as The
      Noosa Plan does not permit the use of pumps within basement car parks.
41.   Demonstrate how all water that lands on the driveways to the basements will be collected and
      drained and that overland flow drainage (from Grasstree Court for example) will not enter the
      basement car parks.
Ecological Impacts