Applicant's Response to Council's Information Request

scenario. Healthy Land and Water Music Modelling Guidelines outline modelling requirements to
achieve these required outcomes.

The stormwater management plan provided with the application proposes water quality to be managed
using SPEL stormsacks and vault 9.8/0.85 QUT and 7/SPEL filter. The pollutant reduction targets were
modelled in music using Rainfall Station 40063 Dayboro Post Office, 6 minute time step from 1980 to
1989. These input parameters to the MUSIC model are inconsistent with the Healthy Land and Water
Music Modelling Guidelines.

Healthy Land and Water Music Modelling Guidelines outline appropriate rainfall for Noosa area is
Cooroy Composite Station ID 40059 from period 1/1/1973-31/12/1983. Additionally, the Healthy Land
and Water Music Modelling guidelines outline that Councils require device performance to be
demonstrated using both Stormwater Australia’s Stormwater Quality Improvement Device Evaluation
Protocol, verification against local parameters and that modelled pollutant reduction efficiency reflects
published figures and expected maintenance schedule.

Information Required

14. Update the stormwater quality treatment train and stormwater management plan to
   demonstrate the required pollutant reduction efficiencies are modelled consistent with the
   Healthy Land and Water Music Modelling guidelines, including correct rainfall station data. In
   particular, where a proprietary device is proposed, provide:

           i. The Stormwater Australia verification certificate for the proposed device along with
              evidence that the verification certificate applies to a development of size and type of
              the proposed development.

          ii. Certification from the SQUIDEP Independent Evaluation Panel to confirm that the
              climatic conditions that the proprietary product was tested under is not statistically
              different from the climate experienced at the Cooroy Composite Rainfall station
              (Station ID 40059) 1/1/1973-31/12/1983.

          iii. The MUSIC model along with a full list of parameter inputs for the MUSIC node provided
               for the proprietary device to achieve the nominated pollutant reduction.

          iv. A lifecycle costing assessment for the proposed treatment train in comparison to
              alternative treatment measures pursuant to AS/NZS4536:1999 and Chapter 5 of Healthy
              Land and Water Music Modelling guidelines.

Applicant’s Response
The Council’s items are addressed below:

    i) & ii) The attached letter from SPEL confirms that its application for certification has been delayed
             as a result of governance issues at Stormwater Australia. These matters are beyond its control.

   iii)     A copy of the music model is included with the supporting documents.

   iv)      A Lifecycle costing assessment prepared SPEL is included in the supporting documents. The
            document does not provide a comparison with an alternative treatment train as this approach
            is not considered appropriate for this particular site.

Council Issue

PO7 of the Water Quality and Drainage Code requires that Water quality treatment systems use natural
processes and materials, whenever possible, and are integrated into development to enhance
biodiversity and landscape benefits. The acceptable solution for this is Water quality treatment systems
are designed to be integrated into the landscape consistent with the technical design guideline
published by Healthy Land and Water by Design for the feature. (eg. For Bioretention Basins: Bioretention
Technical Design Guidelines (October 2014) and for Wetland Systems the Wetland Technical Design