Minor Change Existing Approval OPW12 0095 03 · OPW12/0095.03

                                       III. Temporary vehicular crossings of waterways must be designed and
                                            constructed to convey flows and remain stable for all rainfall events up to the
                                            1 in 10-year average recurrence interval (ARI) event of critical duration.
                         (f)      Ensure clean stormwater is diverted or managed around or through the site without
                                  increasing the concentration of total suspended solids or other contaminants in the
                                  flow and without causing erosion (on site or off site). If it is not feasible to divert all
                                  areas discharging clean stormwater around or through the site, manage the clean
                                  stormwater runoff as for contaminated stormwater runoff, and ensure that sediment
                                  basins are sized to accommodate the additional volume of runoff (See E&SC
                                  Advice Note 2).
                         (g)      Ensure sheet flows of stormwater are managed such that sheet and rill erosion is
                                  prevented or minimised.
                         (h)      Ensure that all concentrated stormwater flows including drainage lines, diversion
                                  drains, channels and batter chutes are managed onto, through, and at release
                                  points from the site in all rain events up to and including the average recurrence
                                  interval (ARI) event of 1 in 2 year ARI without causing water contamination, sheet,
                                  rill or gully erosion, sedimentation, or damage to structures or property
                         (i)      Ensure measures have been implemented such that the runoff from all disturbed
                                  areas flows to a sediment basin or basins. Where it is not feasible to divert runoff
                                  from small disturbed areas of the site to a sediment basin, implement compensatory
                                  erosion and sediment controls (See E&SC Advice Note 3).
                         (j)      Ensure each sediment basin has the capacity to treat flows to current best practice
                                  standards (see E&SC Advice Note 4) and as a minimum to contain all the
                                  stormwater runoff from the 80th percentile 5 day rainfall depth and store 2 months
                                  sediment from the receiving catchment, as determined using the Revised Universal
                                  Soil Loss Equation.
                         (k)      Ensure sediment basins are maintained with sufficient storage capacity to capture
                                  and treat the runoff for the design rainfall depth or event. Where sediment basins
                                  are proposed to be oversized for storage of captured water for re-use, install survey
                                  markers in each such basin to indicate the level that water within the basin must be
                                  lowered to, in order to meet the storage capacity specified in the above requirement.
                         (l)      Ensure sediment basins are dewatered as soon as practicable after each rainfall
                                  event.
                         (m)      Ensure stormwater captured in sediment basins is treated prior to discharge to
                                  minimise the volume and concentration of contaminants released from site, having
                                  due regard to forecast rainfall (See E&SC Advice Note 5).
                         (n)      Ensure sediment basins and associated structures such as inlets, outlets and
                                  spillways are structurally sound for 10 year ARI rainfall event, under normal
                                  circumstances and for 100 year ARI rainfall event, if failure of the basin poses a
                                  threat to downstream dwellings or public safety.
                         (o)      Ensure accumulated sediment from basins and other controls is removed and
                                  disposed of appropriately without causing water contamination.
                         (p)      Ensure sediment does not leave the site on the tyres of vehicles.
               UNITYWATER
               17.       A single Unitywater installed primary water meter must be provided immediately inside the
                         property boundary. Additional water meters must be installed for each title of a community
                         title or sub-lease scheme. Meters must be Unitywater approved, installed in accordance
                         with Unitywater requirements and remain accessible at all times for reading and
                         maintenance purposes.




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Document Set ID: 23113824
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(f)

(g)

(h)

(i)

(i)

(k)

(I)

(m)

(n)

(0)

(Pp)

Ill. Temporary vehicular crossings of waterways must be designed and
constructed to convey flows and remain stable for all rainfall events up to the
1 in 10-year average recurrence interval (ARI) event of critical duration.

Ensure clean stormwater is diverted or managed around or through the site without
increasing the concentration of total suspended solids or other contaminants in the
flow and without causing erosion (on site or off site). If it is not feasible to divert all
areas discharging clean stormwater around or through the site, manage the clean
stormwater runoff as for contaminated stormwater runoff, and ensure that sediment
basins are sized to accommodate the additional volume of runoff (See E&SC
Advice Note 2).

Ensure sheet flows of stormwater are managed such that sheet and rill erosion is
prevented or minimised.

Ensure that all concentrated stormwater flows including drainage lines, diversion
drains, channels and batter chutes are managed onto, through, and at release
points from the site in all rain events up to and including the average recurrence
interval (ARI) event of 1 in 2 year ARI without causing water contamination, sheet,
rill or gully erosion, sedimentation, or damage to structures or property

Ensure measures have been implemented such that the runoff from all disturbed
areas flows to a sediment basin or basins. Where it is not feasible to divert runoff
from small disturbed areas of the site to a sediment basin, implement compensatory
erosion and sediment controls (See E&SC Advice Note 3).

Ensure each sediment basin has the capacity to treat flows to current best practice
standards (see E&SC Advice Note 4) and as a minimum to contain all the
stormwater runoff from the 80th percentile 5 day rainfall depth and store 2 months
sediment from the receiving catchment, as determined using the Revised Universal
Soil Loss Equation.

Ensure sediment basins are maintained with sufficient storage capacity to capture
and treat the runoff for the design rainfall depth or event. Where sediment basins
are proposed to be oversized for storage of captured water for re-use, install survey
markers in each such basin to indicate the level that water within the basin must be
lowered to, in order to meet the storage capacity specified in the above requirement.

Ensure sediment basins are dewatered as soon as practicable after each rainfall
event.

Ensure stormwater captured in sediment basins is treated prior to discharge to
minimise the volume and concentration of contaminants released from site, having
due regard to forecast rainfall (See E&SC Advice Note 5).

Ensure sediment basins and associated structures such as inlets, outlets and
spillways are structurally sound for 10 year ARI rainfall event, under normal
circumstances and for 100 year ARI rainfall event, if failure of the basin poses a
threat to downstream dwellings or public safety.

Ensure accumulated sediment from basins and other controls is removed and
disposed of appropriately without causing water contamination.

Ensure sediment does not leave the site on the tyres of vehicles.

UNITYWATER

17. A single Unitywater installed primary water meter must be provided immediately inside the
property boundary. Additional water meters must be installed for each title of a community
title or sub-lease scheme. Meters must be Unitywater approved, installed in accordance
with Unitywater requirements and remain accessible at all times for reading and
maintenance purposes.

Document Set ID: 23113824

Page 5 of 11

Version: 2, Version Date: 17/07/2024