ECM_22343539_v1_Stormwater Management Report · 132000.200173.1

                 These control measures must be maintained in an effective operational condition. Sediment disposal
                 from site is to occur to the satisfaction of Noosa Council. Defects in erosion and sediment control
                 devices, such as sediment fences, are to be inspected and documented. Upon Inspection, the
                 Contractor is to determine whether the device should be replaced or repaired. Documentation is to
                 include how the damage was caused and what measures can be implemented to reduce the possibility
                 of repeat occurrences. Any damage to either permanent or temporary water quality control structures
                 or devices is to be immediately rectified at the contractor’s expense.

                 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; and
                     •    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 18 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.
                 4.2.3 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 5.

                 Table 5 - 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%.




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Document Set ID: 22343539
Version: 1, Version Date: 16/03/2023