Request for Further Information - 010.2008.00001896.001 [As Published] · 142008.1896

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8.    Outlet protection should be provided for the low flow pipe at the earth weir.
9.    The microphyte discharge riser is not indicated on the plan view.
10.   Engineering drawings and calculations are to be signed off by RPEQ.
11.   Full drainage calculations are to be submitted for assessment.
12.   Access ramps should be provided for the maintenance of the forebay sediment pond.
13.   Provide cross sections along the major storm bypass swale, together with calculations
      supporting the sizing of the same.
14.   The sediment forebay shall have a concrete base for cleaning/ maintenance purposes.
15.   Please provide an indication of the sump location for the sediment forebay.
16.   Council prefers that gabions not be considered for these works due to the high maintenance
      costs.
17.   Please provide koala food trees across the bund.
18.   Please provide fence details on walls and bunds for pedestrians and public access.
19.   Batter slopes are to be planted out with suitable vegetation for public safety from ponds.
20.   Final plans, calculations and documentation may be referred to Council’s external consultants
      for review at the applicants cost.


Land Development (Environmental Scientist)
ENVIRONMENTAL REQUIREMENTS
21.   Given that the receiving environment may have adapted over time to the ongoing loads from
      Noosa Junction, Council is concerned that the wetland concept has been designed to
      establish water quality that may not be applicable to the current environmental requirements of
      the receiving environment. Therefore, provide a report that details:
      21.1.     Current nutrient loads and stormwater flow velocities to the wetland area.

      21.2.     Likely sources of pollution to the wetland, positive and negative impacts of the pollution
                loads and indicate whether there is any opportunity pollution /waterquality
                management measures to be installed upstream of the proposed wetland.

      21.3.     Environmental requirements for species protected by legislation in the proposed
                wetland area and receiving environment and their essential habitat in terms of nutrient
                concentrations and water flow variability pattern requirements.

      21.4.     Measures proposed to be incorporated into the wetland design to minimise the
                opportunity for cane toad and mosquito breeding.

WETLAND DESIGN
22.   Council officers are concerned that the design and performance of both wetlands and
      bioretention basins have advanced significantly since the feasibility study was undertaken.
      The wetland design should be updated to reflect current best practice. The updated design
      must specify:
           i.velocities through the wetland and bypass channel;
          ii.weir sizing and levels;
         iii.maintenance requirements in detail and the their costs; and
         iv. use Tewantin/Noosa rainfall and evaporation data as opposed to Cooroy data that was
             used in the initial study.
          v. Whether the wetland will mitigate >1yr ARI flows.