Stormwater Management Report · MCU19/0008

4.2.2 Ero si o n an d Sed i men t Con tro l

The proposed development received an erosion hazard score of 16 on the International Erosion Control
Association (IECA) erosion hazard assessment form. An erosion and sediment control plan shall be
prepared at the detailed design phase in accordance with IECA 2008 best practice documentation to
ensure the impacts of erosion, turbidity and sedimentation from construction activities will be managed
appropriately. 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 continually maintained in an effective operational condition and
amended as required to minimise environmental harm. 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.
4. 3       Mai n ten an ce an d Mon i to rin g Req ui remen ts

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 8.




4 April 2019                               Stormwater Management Report                                     13
S18-030                                        22 Arakoon Crescent,