Appendix B - Amended Biome Consulting Response

1         INTRODUCTION
Calibre Consulting (QLD) Pty Ltd has been commissioned by Palm Lake Resort to prepare a Stormwater Management
Plan (SWMP) to support the Operational Works Approval for Stage 2 and subsequent stages of the Palm Lakes
Retirement Community. The development is located on 2 & 4 Lamonts Road and 19 & 20 Trading Post Road Cooroy,
within the Noosa Shire Council (NSC) Local Government Area. This submission follows the Stage 2 Operational Works
Approval (OPW16/0203) for the site.

This project has an extensive history, involving an interim reduced site layout (excludes property on 20 Trading Post
Road/Lot 4 on RP215922), numerous submissions to and correspondence with Council to achieve approval of the
stormwater management strategy.

Issue A of this report was provided to Council in September 2016 to support the Operational Works Approval for Stage 2
and subsequent stages of the overall site layout. This was in accordance with Framework Letter Report
(No. B14158.W.07L dated 8 October 2015) and addressed Council’s Decision Notice MCU approval conditions.

The current issue (B) of this report, has been undertaken to address the stormwater items of the Stage 2 Operational
Works Approval Conditions (Application No. OPW16/0203 dated 9 January 2017). Since the previous issue, liaison has
been undertaken with Council Officer Cherie O’Sullivan to update the stormwater quality management strategy to treat
external catchments. A revised strategy was developed alongside Council as per Table 1-1 and was subsequently
approved. As per Stage 2 Operational Works Approval Condition 41(a), the stormwater strategy is to reflect the MUSIC
model with reference SC2G Palm Lakes provided to Noosa Council on 12 December 2016. Details from this approved
MUSIC model have been incorporated into this updated report. Also refer to the email correspondence between Council
provided in Appendix I for details.

                                      Table 1-1: Approved Bioretention Basin Sizing

                            Location of Stormwater             Functional Filter Media Area
                            Quality Treatment                  Size
                            Northern Basin                     525m2
                            Central Basin                      650m2
                            Southern Basin                     305m2
                            Biopod D3                          75m2
                            Biopod D2                          75m2
                            C2                                 SW Treatment Device/s to meet
                                                               90/60/45 %Reduction

Since there was only a minor update to stormwater strategy the only changes to this updated Issue B report other than
this introduction include the following:

•   Section 3.2.5 – While the peak flow mitigation strategy has remained the same, modifications to the central basin has
    changed the stage-storage-discharge relationship, which has been updated in XP-RAFTS modelling.
•   Section 3.2.6 – Updated hydrological results indicate that the same outcome has been achieved (i.e. no adverse
    impact and no increase of peak flows from existing conditions discharging from the site).
•   Section 3.2.7 – Updated hydrological results indicate that the top of the embankment is not overtopped during
    extreme storm events as per the previous report.
•   Section 4.3 – The stormwater quality management strategy has been updated to incorporate Table 1-1.
•   Section 4.4.4 – Treatment Node for bioretention basins/pods have been updated accordingly.
•   Section 4.5 – MUSIC modelling results were updated and demonstrate compliance with WQO’s.

Any changes to the report other than this introduction and conclusion have been indicated in indented italicised text.




16-001014-01B | STORMWATER MANAGEMENT PLAN                       COOROY RETIREMENT COMMUNITY, TRADING POST
(SWMP) | PALM LAKE RESORTS                                                                   ROAD, COOROY                |1