Stormwater Management Plan 12_05_26

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Maintenance
Maintenance of erosion and control treatment measures (such as sediment fences) will be undertaken if it is
observed that they have not been properly installed or the capacity of the measure falls below 75%.

Minimise Disturbance Area
Clearing of land is to be minimised to areas planned to be actively under construction in the near term (e.g.
within the next 3-6 months).

Stabilise Disturbed Areas
Provide temporary stabilisation of disturbed soils whenever active construction is not occurring on a portion of
the site. Provide permanent stabilisation during finish grade and landscape the site.

Protect Slopes and Channels
Safely convey runoff from the top of the slope and stabilise temporary and permanent channel crossings as
quickly as possible and ensure that increases in runoff velocity caused by the project do not erode the channel.

Diversions of Upslope Runoff
Upslope runoff should be diverted away from areas of exposed soil to prevent the contamination of clean
runoff. This may be achieved by installing tightly abutting sandbags, creating a 'sandbag perimeter bank' to
divert flow.

Sediment Fences and Inlet Protection
Delineate site perimeter to prevent disturbing areas outside the project limits. Sediment fences should be
installed around the perimeter of works to ensure contaminated runoff is filtered and sediment is trapped before
leaving the site. Sandbags or geofabric should also be placed around/over existing stormwater inlets/grates
throughout the site to filter any contaminated runoff before entering the existing piped stormwater network.

Retain Sediment
Retain sediment-laden waters from disturbed, active areas within the site.

Stabilised Vehicle Entry/Exit Point
A stabilised entry/exit point should be constructed to minimise the transport of sediment off-site. All vehicles
entering and leaving the site must use this designated entry/exit point.

Stockpiles
Stockpile locations should be identified before the commencement of works. Ideally, they should be located in
a flat area at least 15m from any water body or stormwater inlet. Sediment fences should be installed
downslope of all erodible stockpiles, and upslope protection measures should be used (i.e. sandbags or
sediment fence) to divert runoff in the event of rain. At the end of each working day, stockpiles should be
covered with geofabric if rain or high winds are forecast.

Street Sweeping
Ensure that local roads are swept as required. This will minimise the potential for sediment tracked onto the
road to be washed into the stormwater system. If there is a large quantity of sediment being tracked onto the
surrounding streets, the stabilised entry/exit point may need to be raked or reinforced with rock treatment to
provide more effective sediment removal for vehicles.




12 May 2026