PART Response to Information Request · OPW11/0335

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-1005-310-06), each
with a design treatment train that flows toward the terminal wetland and the receiving node of
the receiving waters next to the Noosa National Park.

The Solutions state minimum sizes of Rainwater Tanks, Bio-retention systems and Constructed
Wetlands 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.

    Table 10-2: Dimensions of Rainwater Tanks and WSUD Deemed to Comply Solutions
      Deemed to Comply                         Deemed to Comply
                                                                                              Development size
          Solution                               Requirement
                                          3 kL.

  Rainwater tank for                      QId Development Code
                                                                                  3 kL. per beach shack
  attached dwellings in the               MP 4.3 requiresl.5 kL per
                                          required pedestal in                    2 x 100 kL = 200 kL (apartment
  Sunshine Coast Regional
                                          commercial buildings with               buildings)
  Council (North Coast)
  region:                                 a class 3 code (i.e. motels             1 x 100kL = commercial building
                                          or boarding houses that
                                          unrelated people co-habit).
                                                                                  Bio-retention Al (north) = 1.5 %
 Bio-retention System Filter                                                      Bio-retention B1 (Mid) = 1.5 %
 Media Area (% of                                        1.1 %                    Bio-retention C1A (south) = 1.5 %
 catchment area):                                                                 Bioretention C1B (south) = 1.5%
                                                                                  Total Bio-retention Area = 1 5%

The Rainwater Tanks are sized appropriately 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 and the Constructed Wetland
System.

Detailed MUSIC modelling identified that the proposed development will achieve the required
water quality objectives (Appendix B). Suspended solids and total nutrients will be removed
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 terminal wetland from the
existing caravan park site (Table 4-1).

©2012 Simmonds & Bristow Pty Ltd                        Contrast Constructions                          J-1005-310 - 13 January 2012
I \CLIENTFILES\Contrast Constructions\1108-155c- Essence of Peregian SCEP Stage I Update\09_Output Documents\1108-155C_SWMP
SCEMP_Scanlon Property Group V3 0 ta_120113.doc                                                                         Page 17 of 24