Further information re Request to Change Approval MCU 132003.221132.8

CONCLUSION                                                                                                        3-1


3           CONCLUSION

            The    approved Doonella Noosa Storm water and Water Quality Management Plan (WBM, 2005)
            identified that achievement of a no-net-increase was not always possible for nutrients as shown in

            Tables 2-9 to 2-13 of this earlier report. These minor shortcomings were acceptable to Council and

            its third party reviewers at the time and approved for development.


            Currently only Stage C of the development remains to be approved.                 Due to loss of area for
            stormwater treatment resulting from incorporation of the Link Road, the no-net-increase target is not

            achievable, particularly for total nitrogen loadings.


            The stormwater management system proposed for Stage C remains consistent with the intent of the

            approved Doonella Noosa Stormwater and Water Quality Management Plan (WBM,2005), and there
            are no further       options to increase stormwater treatment within the proposed development layout for
            Stage C.

            Stage C when assessed against typical load based reduction targets for urban development in SEQ
            is found to far exceed them.


3.1         Recommendation

            Based on the fact that the proposed stormwater management system for Stage C is consistent with

            the approved Doonella Noosa Storm water and Water Quality Management Plan (WBM,2005), and

            that there     are    no   further obvious options for incorporation of additional treatment elements, the

            recommended stormwater system for Stage C remains appropriate.


             It comes close to achieving a no-net-worsening, and easily achieves the typical load based reduction

            targets for urban development.

             It would be appropriate that the typical load based reduction targets for urban development were

            adopted for the approval of Stage C, noting that the proposed system will operate at a much higher
            level than this minimum requirement.


             It is important to note also that all modelling completed to date, has not taken into any polishing effect

            that may occur by the transfer of water through the very large bushland buffer (previously part of the

            site and     now     owned by SCRC) which surrounds the site.       It is expected that through the natural

             processes, there will be further significant reductions in flows and pollutants before these enter into

            any surrounding waters.




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