RFI Response (rec. 4.09.25) S25-137 Stormwater Report_Optimized

The effectiveness of the erosion and sediment control devices can be monitored by visual audits. All ESC measures are
to be inspected:
    •      at least daily (when work is occurring on site) or weekly (when work is not occurring on site)
    •      within 24 hours of expected rain
    •      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 run-off shall be prevented from entering neighbouring properties. This shall be achieved by
landscaping disturbed areas immediately and prior to a rainfall event.
An erosion hazard assessment has been conducted in accordance with IECA.
The proposed development scored 18 on the 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.

4.2.2      Maintenance and Monitoring Requirements

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 2.


                                          Table 2 - Maintenance of ESC measures

                                                                                      Timeframe for Completion of
              ESC Measure                         Maintenance Trigger
                                                                                               Maintenance

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

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


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




 S25-137                                        Stormwater Management Report                                   Page 4 of 6
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