Response to Information Request - Received on 19/04/2012 · OPW11/0335

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        Development details (site layout, sub-catchments, conceptual earthworks and conceptual
        drainage) are provided as plan drawings in Appendix A (drawing numbers 1108-155C-01-01 to
        1108-155C-01-06). Specifications of the site layout (roof area, balance area) are given in
        Appendix B. There are south, mid, and north sub-catchments (drawing J-1 005-31 0-06), each
        with a design treatment train that flows toward the existing heath wetland and the receiving
        node of the receiving waters next to therNoosa National Park.


        The Solutions state minimum sizes of Rainwater Tanks and Bio-retention                                                                  systems that are
        required     to meet the Queensland Development Code Mandatory Part 4.2 and 4.3, and the
        stormwater quality objectives outlined in the Best Practice Environmental Guidelines                                                                    -
                                                                                                                                                                    Urban
        Stormwater. The stated dimensions proposed for the Essence of Peregian development are
        listed in Table 10-2.

                                                                                                                                                                 .


                                                                           I SoI utlons
           Table 10-2: Dimensions 0fRainwater Tanks andWSUD Deemed to Comply

                Deemed to Comply                               Deemed to Comply
                                                                                                         I’
                                                                                                                     ’"’"
                                                                                                                            "" ,
                                                                                                                                     Development size               ,

                                                                                                                                                                    .J’
                                                                                                                                                                        ,,’

                      Solution                                     Requirement
                                                                                                                ..




                                                                                                         ’.~’!;             ,
                                                                                                                                                                    \,


                                                    3 kL.

                                                    Old Development Code
         Rainwater tank for                                                                                   3 kL. per beach shack
                                                    MP 4.3 requires1.5 kL per
         attached dwellings in the
                                                                                                              2 x 100 kL               =   200 kL (apartment
         Sunshine Coast Regional                    required pedestal in
                                                    commercial buildings with                                 buildings)
         Council (North Coast)
                                                    a class 3 code (Le. motels                                1 x 100kL = commercial building
         region:
                                                    or boarding houses that
                                                                                                                     ~-.~       ,A
                                                                                                                            .

                                                    unrelated people co-habit).
                                                                                                                "’
                                                                                                                     "


                                                                                                              Bio;retention A 1 (north)                  =   1.5 %
                                                                       /- J,;’
                                                                        ’"
                                                                                                                     J      ’




                                                                                                              Bio-retention B1 (Mid)= 1.5 %
         Bio-retention System Filter
         Media Area (%of                                                1.1 %               1
                                                                                                              Bio-retention C1A (south)= 1.5 %
                                                                                            .1
         catchment area):                                                                        I
                                                                                                              Bioretention C1 B (south)= 1.5%
                                                                                 t.)
                                                                                       .I
                                                                                            3~                              l

                                                                                                     ,    Total Bio-retention Area = 1 5%
                                                                                                                     "J
                                                                                            j


        The Rainwater Tanks are sized       app~opriately for the accommodation units (3 kL per beach
        shack).      The surface areas represented by the ’Bio-retention Trenches (1.5% of the catchment
        area) complies the WSUD Deemed to Comply Solutions (1’:1 %).

        It is possible to design a stormwater treatment train outside the prescribed parameters,
        provided that the Best Practice Environmental Management Guidelines Urban Stormwater                                                -




        (DERM 2009) and the planning requirements of the assessment authority are followed. A
        carefully designed stormwater treatment train has been proposed by the Stormwater
        Management Plan, and has been supported by detailed MUSIC modelling (section 6.0).

        In summary, the Environmental Impact Assessment indicated that the proposed Essence of
        Peregian development will have negligible consequences resulting from total suspended solids,
        total nitrogen and total phosphorus entering Noosa National Park. The treatment train for the
        SWP has been designed to minimise the effects of rainfall and stormwater erosion of the
        landscape, retain rainwater collected on roofs and hard surfaces for irrigation and domestic use,
        and direct remaining overflow through Bio-retention Trenches.


        Detailed MUSIC modelling identified that the proposed development will achieve the required
                    objectives (Appendix B). Suspended solids and total nutrients will be removed
        water quality
        early in the treatment sequence (Appendix B). It is predicted that the maximum concentrations
        of pollutants in stormwater during extreme events (Appendix B) will be substantially less than
        concentrations presently measured in stormwater entering the existing heath wetland from the
        existing caravan park site (Table 4-1).



        @2012 Simmonds & Bristow Pty LId                              Contrast Constructions                                                J-1005-310   -
                                                                                                                                                             22 March 2012
        1:ICLlENTFILESIContrast Constructionsl11 08-155c   -   Essence of Peregian SCEP Stage 1 Updatel09_Output Documentsl1108-155C SWMP                _




        SCEMP_Scanlon Property Group_V4 0_la_120321 ,doc                                                                                                     Page 18 of 24