Attachment E - Stormwater Management Report · MCU24/0112

    •   within 18 hours of a rainfall event (i.e. an event of sufficient intensity and duration to mobilise
        sediment on site).
Drainage paths are to be inspected to ensure the sediment fences are not being bypassed as a result
of soil erosion.

Sediment laden runoff shall be prevented from entering neighbouring properties. This shall be achieved
by landscaping disturbed areas immediately and prior to a rainfall event.
The proposed development has scored a ‘13’ on the IECA erosion hazard assessment with one trigger
score value exceeded as a result of the site slope (refer Appendix A for details). Further details of
proposed on site erosion and sediment control measures will be required at the detailed design phase
of the development.
4.3.3 Ma int en an ce and M o nit o ri ng Re qui r em ent s

Periodic maintenance and monitoring of stormwater devices proposed in this report is crucial to ensure
effective operation and design life.
Inspect field inlet grates, pits and underground pipes for blockage or damage at least 6 monthly or after
significant rainfall event. The filter baskets shall be inspected and maintained preferably by the
manufacturer to avoid damage to units and to ensure adequate cleaning and record keeping. For the
first 12 months routine inspections of filter baskets shall be carried out monthly with routine clean out
at alternate months. Results of the initial 12 months maintenance program shall be used to determine
future maintenance intervals. Refer manufactures maintenance and monitoring methodology for
specific details.

Maintenance of ESC measures must occur in accordance with Table 7.

Table 7 - ESC maintenance requirements.

        ESC Measure                  Maintenance Trigger              Timeframe for Completion
                                                                           of Maintenance

 Sediment basins              When settled sediment exceeds          Within 7 days of the
                              the volume of the sediment             inspection.
                              storage zone

 Other ESC measures           The capacity of ESC measures           By the end of the day.
                              falls below 75%.

Sediment accumulation on ESC devices is to be removed and disposed of to the satisfaction of Noosa
Council.




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