Attachment 7- Site Based Stormwater Management Plan

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 Disturbed Areas

Only clear land which will 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

To prevent the contamination of clean runoff, upslope runoff should be diverted away from
areas of exposed soil. 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 ensure that
any contaminated runoff is filtered before it enters the existing piped stormwater network.

Retain Sediment

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

Stabilised Vehicle Entry/Exit Point

To minimise the transport of sediment off site, a stabilised entry/exit point should be
constructed. All vehicles entering and leaving the site must use this designated entry/exit
point.

Site Based Stormwater Management Plan                                             Page 6 of 20
1856-SBSMP-01_Version 2.0 (April 2019)