Att 4 - SWMP · MCU21/0117

                    3. Filter sock sediment traps are to be used in the table drains downstream of works
                       within the road reserve.

            In addition to these measures, stockpiles and construction materials are not permitted to be
            stored within the road reserve and shall be contained using sediment fencing downstream
            of these areas, turfed diversion swales are to be provided at upstream boundaries to reduce
            flows to earthworks areas and sediment disposal from the site shall be undertaken to the
            satisfaction of Noosa Shire Council.

                        4.1.2 Erosion and Sediment Control Monitoring

            The control measures described above must be maintained in an effective operational
            condition during the construction works. Regular inspections should be carried out by the
            contractor and any defects in erosion and sediment control devices specified for the site
            are to be remedied as soon as practicable. Any damage to either temporary or permanent
            water quality control structures is to be immediately rectified at the contractor’s expense.
            The inspection of the ESC devices is to be carried out as follows:

                             1. Routine Inspection – is to be carried out daily while work is being carried out
                                on site, or weekly while works are not being carried out.
                             2. Preventative inspection – to be carried out a maximum of 24 hours before
                                rain is forecast.
                             3. Reactive inspection – to be carried out within 18 hours of a rainfall event
                                sufficient to mobilise surface sediment on the site.

            Documentation of these defects is to be carried out, recording the date the defect was
            identified, a description of the defect, the cause of the defect and measures that can be
            implemented to reduce the likelihood of the defect occurring in the future. Once the
            device has been repaired, the date of repair and the solution implemented should also be
            recorded in the documentation. An example template for this documentation has been
            provided in Appendix B Example ESC Defect Documentation Template.


                    4. 2. O P E R A T I O N A L

            The development is to comply with the Noosa Council Water Quality and Drainage Code,
            AO6.2 which states:

            “All stormwater runoff is treated to achieve maximum removal of nutrients, gross pollutants
            and suspended solids as determined by cost to efficiency ratios. (e.g. bioretention basins
            must be sized to achieve at least 80% reduction in total suspended solids, 60% reduction in
            total phosphorous, 45% reduction in total nitrogen and 90% reduction in gross pollutants
            >5mm).”

            It is proposed that the following measures to be implemented will provide the required
            level of stormwater quality improvement to minimise impacts to the downstream network:

                    •   First-flush divertors will be installed for roof-water drainage to divert initial run-off
                        capture to irrigation of the vegetated areas on site.



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