2019-10-08 Planning & Environment Committee Agenda

PLANNING & ENVIRONMENT COMMITTEE MEETING AGENDA                               8 OCTOBER 2019


          a.   The flood detention function is to be completely removed from the bioretention
               device and the downstream detention tank increased in size to fully serve the
               required detention function. Retaining walls surrounding the bioretention device
               are to be reduced in height so that amenity, accessibility and light penetration
               are improved; and
          b.   Revised detention tank design calculations and documentation is to be provided
               which identifies all assumptions and the methodology applied in deriving the
               tank design and which is based on the recommendations of Australian Rainfall
               and Runoff 2019 and QUDM 2017. Ensemble temporal patterns are to be
               utilised for the analysis as well as the current rainfall intensities recommended
               by Bureau of Meteorology. The detention tank is to either achieve non-
               worsening for the range of durations relevant to the downstream drainage
               network or is to demonstrate flows are consistent with the design of the
               network.
    48.   Bioretention devices are to be designed in accordance with the Bioretention
          Technical Design Guidelines (Water by Design, 2012), and IPWEQA Standard
          Drawing No. WSUD-001 and are to be provided with a free-draining outlet from the
          sub-soil drainage system.
    49.   Permanent educational signage must be erected to educate the public about the
          function of the bioretention device(s). The dimensions, standard, presentation and
          location of the educational signage must be in accordance with an Operational Works
          approval.
    50.   All stormwater quality treatment devices must be maintained in accordance with the
          Water by Design (2009) Maintaining Vegetated Stormwater Assets (Version 1).
          Records of all maintenance activities undertaken must be kept and made available to
          Council upon request.
    51.   Any proposed Community Management Statement required for the development
          must include Water by Design (2009) Maintaining Vegetated Stormwater Assets
          (Version 1) and must include the full cost of maintaining the system in accordance
          with Water by Design (2009) Maintaining Vegetated Stormwater Assets (Version 1).
          The cost of maintaining the system must be included in the proposed levies for each
          shed owner.
          Acid Sulfate Soils
    52.   All works must be carried out in accordance with an Acid Sulfate Soil and
          Groundwater Management Plan for the development prepared by a suitably qualified
          person and referenced in a Development Permit for Operational Works. The Acid
          Sulfate Soil and Groundwater Management Plan submitted with the application for
          Operational Works must detail:
          a.   Management necessary for the proposed filling to avoid any impacts of the
               Potential Acid Sulfate Soils identified on the site – in particular impacts related
               to compacting Acid Sulfate Soils into the groundwater table and releasing water
               contaminants;
          b.   design measures necessary to prevent any oxidation of the potential acid
               sulfate soils or transfer of acid sulfate soil leachates via dewatering of
               groundwater through underground pipe bedding material;
          c.   Any other matters necessary to prevent the oxidation of potential acid sulfate
               soils or release of Acid Sulfate Soil related water contaminants.
    53.   All waters, including stormwater runoff, groundwater seepage and leachate from acid
          sulfate soils must be suitable for the downstream environment prior to release from
          the site.

                                                                                  Page 10 of 48