H - Revised Integrated Water Management Plan by Cardno (inc MUSIC file) (13.09.19)

                                                                                   Integrated Water Management Plan
                                                                           Noosa Marketplace : 2-20 HOFMANN DRIVE




6         Stormwater Quality Management

The incorporation of Water Sensitive Urban Design (WSUD) features and the development of a Stormwater
Quality Management Plan will ensure that the quality of the stormwater discharging from the site does not
negatively influence receiving environments. The site of the proposed development drains south towards Eenie
Creek.
Noosa Plan Table 7-1 outlines the specific outcomes, acceptable solutions and probable solutions for the
Noosa Plan Water Sensitive Design Code (WSDC) (Noosa Shire Local Government, 2018). This table
recommends the adoption of the Water Quality Objectives outlined in the State Planning Policy 2017 (SPP)
(Department of Infrastructure, Local Government and Planning, 2017) for Queensland as the target objectives.

6.1       Stormwater Quality Objectives
6.1.1     Operational Phase
The stormwater quality design objectives applicable to the site, as outlined in Table B of the State Planning
Policy (SPP) (Department of Infrastructure, Local Government and Planning, 2017) are:
> Total Suspended Solids (TSS)                80% removal of mean annual load from unmitigated development.
> Total Phosphorous (TP)                      60% removal of mean annual load from unmitigated development.
> Total Nitrogen (TN)                         45% removal of mean annual load from unmitigated development.
> Gross Pollutants > 5mm                      90% removal of mean annual load from unmitigated development.

6.1.2     Construction Stage
The construction phase stormwater quality design objectives applicable to the site are outlined in Table A of
the DILGP State Planning Policy (Department of Infrastructure, Local Government and Planning, 2017).
The release values for stormwater captured in a sediment basin are not to exceed the following limits:
> Total Suspended Solids (TSS):                          50 mg/L
> pH:                                                    6.5 – 8.0
Appropriate erosion and sediment control measures will be required to be designed, constructed and operated
in accordance with the SPP 2017 guidelines during the construction phase of the development.




V190428 | 10 September 2019 | Commercial in Confidence                                                          16