Minor Change Existing Approval OPW12 0095 03 · OPW12/0095.03

               5.        Council reserves the right to call up any performance bond held or levy charges against the
                         property, should emergency works be required to be undertaken by Council to make the
                         site safe due to inactivity on the development site for extended periods of time.
               6.        Should any changes or modifications to the approved plans be required as a result of
                         construction constraints, a “Request to change an existing approval” under the Sustainable
                         Planning Act 2009 must be made. Amended plans clearly indicating the changes must be
                         lodged with this application along with the appropriate fees.
                         Erosion and Sediment Control
               1.        In this document, an effectively stabilised surface is defined as one that does not:
                         (a)      have visible evidence of soil loss caused by sheet, rill or gully erosion or
                         (b)      lead to sedimentation, or
                         (c)      lead to water contamination
               2.        Diverting clean stormwater runoff into a sediment basin is an inferior option to diverting
                         clean stormwater around or through the site because it will cause an increase in the volume
                         and frequency of contaminated releases from the sediment basin. For this reason, diverting
                         clean stormwater into a sediment basin is not acceptable unless the proponent
                         demonstrates that diverting clean stormwater around or through the site is not feasible.
               3.        Compensatory controls are erosion controls, flow controls and sediment controls which
                         compensate for the lack of sediment basin and are applied such that the type, timing,
                         placement and management of controls minimise the potential for water contamination and
                         environmental harm. This is primarily achieved by reducing the risk of erosion and
                         subsequent sediment release, for example by turfing or mulching and managing
                         concentrated flows in the area
               4.        Research has shown that sediment basins designed on a “batch” or total storm capture
                         approach are only capable of treating a small percentage of the annual runoff volume
                         without basin size becoming excessive. Innovation in sediment basin design to incorporate
                         continuous flow treatment is likely to occur in the future and as this technology becomes
                         available in best practice guidelines it is required that this technology be adopted where a
                         better water quality outcome will result. In the interim the minimum basin size is as specified
                         in the condition.
               5.        Dewatered flows from sediment basins must be treated to ensure total suspended solids
                         concentrations of less than 50mg/L and that pH is within 6.5-8.5 unless it can be
                         demonstrated that a non compliant release occurred to facilitate a better environmental
                         outcome. For example, higher total suspended solids concentrations may be acceptable in
                         circumstances where further rain is imminent and it can be substantiated that releasing
                         partially treated basin water which has a TSS concentration exceeding the release limit,
                         would minimise the total contamination released from the site, by providing for the capture
                         and treatment of expected runoff. However, releasing waters from sediment basins without
                         treatment is not acceptable
                         Unitywater
               1.        All internal water supply mains and reticulated sewerage is privately owned and maintained,
                         and is the responsibility of the body corporate.
               2.        Connection of the proposed works to existing Unitywater water supply and sewerage
                         reticulation can only be performed by Unitywater. A quotation for such works will be
                         prepared upon request.
               3.        Unitywater currently requires the installation of Elster PSM 50100/39 dual check meters.
                         Water meters may be purchased direct from “Elster” and installed by the developer, or
                         Unitywater can provide the meters and undertake the works.
               4.        Where connection to the existing reticulation system is required, the depth of the existing
                         pipework must be determined prior to initiation of works to ensure that the connection can


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Document Set ID: 23113824
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[OCR of page images]
5. Council reserves the right to call up any performance bond held or levy charges against the
property, should emergency works be required to be undertaken by Council to make the
site safe due to inactivity on the development site for extended periods of time.

6. Should any changes or modifications to the approved plans be required as a result of
construction constraints, a “Request to change an existing approval” under the Sustainable
Planning Act 2009 must be made. Amended plans clearly indicating the changes must be
lodged with this application along with the appropriate fees.

Erosion and Sediment Control
1. In this document, an effectively stabilised surface is defined as one that does not:

(a) have visible evidence of soil loss caused by sheet, rill or gully erosion or

(b) lead to sedimentation, or
(c) lead to water contamination
2. Diverting clean stormwater runoff into a sediment basin is an inferior option to diverting

clean stormwater around or through the site because it will cause an increase in the volume
and frequency of contaminated releases from the sediment basin. For this reason, diverting
clean stormwater into a sediment basin is not acceptable unless the proponent
demonstrates that diverting clean stormwater around or through the site is not feasible.

3. Compensatory controls are erosion controls, flow controls and sediment controls which
compensate for the lack of sediment basin and are applied such that the type, timing,
placement and management of controls minimise the potential for water contamination and
environmental harm. This is primarily achieved by reducing the risk of erosion and
subsequent sediment release, for example by turfing or mulching and managing
concentrated flows in the area

4. Research has shown that sediment basins designed on a “batch” or total storm capture
approach are only capable of treating a small percentage of the annual runoff volume
without basin size becoming excessive. Innovation in sediment basin design to incorporate
continuous flow treatment is likely to occur in the future and as this technology becomes
available in best practice guidelines it is required that this technology be adopted where a
better water quality outcome will result. In the interim the minimum basin size is as specified
in the condition.

5. Dewatered flows from sediment basins must be treated to ensure total suspended solids
concentrations of less than 50mg/L and that pH is within 6.5-8.5 unless it can be
demonstrated that a non compliant release occurred to facilitate a better environmental
outcome. For example, higher total suspended solids concentrations may be acceptable in
circumstances where further rain is imminent and it can be substantiated that releasing
partially treated basin water which has a TSS concentration exceeding the release limit,
would minimise the total contamination released from the site, by providing for the capture
and treatment of expected runoff. However, releasing waters from sediment basins without
treatment is not acceptable

Unitywater

1. All internal water supply mains and reticulated sewerage is privately owned and maintained,
and is the responsibility of the body corporate.

2. Connection of the proposed works to existing Unitywater water supply and sewerage
reticulation can only be performed by Unitywater. A quotation for such works will be
prepared upon request.

3. Unitywater currently requires the installation of Elster PSM 50100/39 dual check meters.
Water meters may be purchased direct from “Elster” and installed by the developer, or
Unitywater can provide the meters and undertake the works.

4. Where connection to the existing reticulation system is required, the depth of the existing
pipework must be determined prior to initiation of works to ensure that the connection can

Page 8 of 11
Document Set ID: 23113824

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