Attachment D - Stormwater Report · MCU18/0013

                             local flooding problems;

                             aesthetic pollution of drainage paths; and

                             damage to local ecosystems.
      Best practice erosion and sediment controls must be installed to minimise the discharge of sediment laden
      runoff during construction. Erosion and sediment control plans shall be developed during detailed design
      phase and must be continually maintained and amended as required to minimise environmental harm.
      Erosion and sediment control plans are based on three sets of control measures:

                             drainage control;

                             erosion control; and
                             sediment control.

      These control measures must be maintained in an effective operational condition. Sediment disposal from
      site is to occur to the satisfaction of NSC. 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 received an erosion hazard score of 16. An erosion and sediment control plan
      shall be prepared at the detailed design phase to ensure the impacts of erosion, turbidity and sedimentation
      from construction activities will be managed appropriately. See Appendix A for the competed erosion hazard
      assessment form.

       5.1           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.



                                       24 Arakoon Street, Sunshine Beach QLD 4567
Job No – S18-003                          STORMWATER MANAGEMENT REPORT                                               8