Appendix F Engineering Report - 14-16 Mary Street, Noosaville - Bounce Hostels 15.6.2018

    4.3. Stormwater Quality

Under the State Planning Policy – Water, the assessment benchmark for water quality treatment states
that treatment of stormwater is required only if a material change of use application involves premises
greater than 2,500m2. As the development is on a land area of 2293m2, the requirement for stormwater
quality treatment is therefore not triggered. Notwithstanding, it has been suggested by Council officers
that Division 20 of the Noosa Plan — Water Sensitive Design Code, which outlines water quality
objectives, needs to be addressed and in particular objective items O1, O7 and O10. Extracts from
these codes follow:


             column 1 Specific Outcomes                                  column 2 Probable solutions
 Maintenance of environmental values                          S1.1 Development meets the applicable
 and water quality objectives                                 performance outcomes of the State Planning
 O1- Downstream ecosystems, properties                        Policy Appendix 2 SPP Code: Water Quality; AND
 and infrastructure are not adversely                         S1.2 Design and construction methods for
 impacted by either changes to flow, water                    stormwater quality treatment assets are in
 quality or ecosystem health caused by                        accordance with Healthy Waterways Water By
 development.                                                 Design Guidelines; AND
                                                              S1.3 Commitments are made to implement a
                                                              cost effective maintenance strategy for the life
                                                              cycle of any engineered water quality treatment
                                                              device; AND
                                                              S1.4 Water quality nutrient load modelling is
                                                              undertaken in accordance with Water by Design
                                                              Music Modelling Guidelines to demonstrate
                                                              compliance with the SPP nutrient reduction
                                                              requirements; AND
                                                              S1.5 Stormwater outlets that directly discharge
                                                              to naturally acidic environments are managed to
                                                              prevent eutrophication; AND
                                                              S1.6 Suitable methods are incorporated to
                                                              prevent the spread of invasive environmental
                                                              weed species at stormwater outlets.



 O7 Natural treatment strategies, including                   S7.1 No probable solution
 grass swales and bio-retention systems,
 vegetated filtration strips and gross pollutant
 traps, are used wherever possible.
 O10 Development design and operation                         S10.1 Methods to prevent gross pollutants
 facilitates nil increase in gross pollutants                 entering stormwater systems and waterways
 entering stormwater systems.                                 are adopted that— a) are low maintenance; b)
                                                              prevent nutrient leaching in the event scheduled
                                                              maintenance is delayed; and c) facilitate human
                                                              behaviour change (e.g. signage, bins)




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17699 - Bounce Hostel, 16 Mary Street Noosaville – Engineering Report – Rev A