Minor Change Existing Approval - 132002.220212.3 (As Published).pdf

               Vegetation Protection from Impervious Pavements
               40.    Any internal pavements within the drip zone of any of the existing trees on site shall be
                      designed as a pervious pavement and constructed so as not to damage the tree or their root
                      system in anyway whatsoever. In this regard, plans shall be submitted to the Council for
                      approval that clearly show the type and extent of the pervious pavement prior to obtaining a
                      Development Permit for Operational Works.
               Stormwater Drainage
               41.    All stormwater drainage shall be collected on site and discharged to Council’s existing
                      drainage structures. In this regard, plans shall be prepared by a Registered Professional
                      Civil Engineer and submitted to Council prior to obtaining a Development Permit for
                      Operational Works.
               42.    A Gross Pollution Trap (GPT) shall be installed within the development site, just prior to any
                      stormwater drainage being discharged into Council’s drainage system. To this end the GPT
                      shall be capable of capturing solids, floatables, oils and grease from the stormwater run-off
                      and details of the GPT shall be submitted to Council for approval prior to obtaining a
                      Development Permit for Operational Works.
               43.    Grease/oil arrestors shall be provided throughout each of the carparking areas (Basements
                      1, 2 & 3) and on the driveway areas of the site to minimise the potential volume of
                      contaminants that would otherwise need to be captured by the GPT.
                      In this regard stormwater run-off from the carparking and driveway areas shall have the first
                      flush (the first 12 mm of rainfall or hose-down) collected in the grease/oil arrestors provided
                      throughout the site prior to being permitted to discharge to the GPT.
                      All other clean stormwater, such as roof water, can bypass the grease/oil arrestors and the
                      GPT.
               44.    A detailed maintenance plan shall be prepared for the proposed GPT and the grease/oil
                      arrestors, which shall be submitted to the Council for approval prior to obtaining a
                      Development Permit for Operational Works.
               45.    Tabulated hydrologic and hydraulic calculations that demonstrate the adequacy or otherwise
                      of Council’s existing stormwater drainage system shall be submitted in conjunction with a
                      Development Permit for Operational Works. Such calculations shall include any remedial
                      measures necessary to rectify defects in the existing system.
                      Where proposed site drainage is to be connected to Council’s existing system, the
                      calculations shall clearly demonstrate the adequacy of the existing drainage network to
                      accept the additional stormwater flows.
                      Should Council’s existing drainage system not be adequate, the applicant will be required to
                      either upgrade Council’s system and/or provide on-site detention/storage tanks to reduce
                      peak flows.
               46.    Plans detailing the existing and proposed drainage network including plans and longitudinal
                      sections of pipeline, the location of pits, pipe invert and pit surface levels, junction details,
                      size and class of pipes, trench conditions and details of surface flow paths together with
                      tabulated hydrologic and hydraulic calculations that detail the drainage network and the
                      capacities of the various surface flow regimes shall be submitted to the Council for approval
                      prior to obtaining a Development Permit for Operational Works.
                      Where flows are in excess of 100 litres/second then a hydraulic grade line analysis will be
                      required.




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Document Set ID: 25012091
Version: 5, Version Date: 29/07/2026


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Vegetation Protection from Impervious Pavements

40.

Any internal pavements within the drip zone of any of the existing trees on site shall be
designed as a pervious pavement and constructed so as not to damage the tree or their root
system in anyway whatsoever. In this regard, plans shall be submitted to the Council for
approval that clearly show the type and extent of the pervious pavement prior to obtaining a
Development Permit for Operational Works.

Stormwater Drainage

41.

42.

43.

44.

45.

46.

All stormwater drainage shall be collected on site and discharged to Council’s existing
drainage structures. In this regard, plans shall be prepared by a Registered Professional
Civil Engineer and submitted to Council prior to obtaining a Development Permit for
Operational Works.

A Gross Pollution Trap (GPT) shall be installed within the development site, just prior to any
stormwater drainage being discharged into Council's drainage system. To this end the GPT
shall be capable of capturing solids, floatables, oils and grease from the stormwater run-off
and details of the GPT shall be submitted to Council for approval prior to obtaining a
Development Permit for Operational Works.

Grease/oil arrestors shall be provided throughout each of the carparking areas (Basements
1, 2 & 3) and on the driveway areas of the site to minimise the potential volume of
contaminants that would otherwise need to be captured by the GPT.

In this regard stormwater run-off from the carparking and driveway areas shall have the first
flush (the first 12 mm of rainfall or hose-down) collected in the grease/oil arrestors provided
throughout the site prior to being permitted to discharge to the GPT.

All other clean stormwater, such as roof water, can bypass the grease/oil arrestors and the
GPT.

A detailed maintenance plan shall be prepared for the proposed GPT and the grease/oil
arrestors, which shall be submitted to the Council for approval prior to obtaining a
Development Permit for Operational Works.

Tabulated hydrologic and hydraulic calculations that demonstrate the adequacy or otherwise
of Council’s existing stormwater drainage system shall be submitted in conjunction with a
Development Permit for Operational Works. Such calculations shall include any remedial
measures necessary to rectify defects in the existing system.

Where proposed site drainage is to be connected to Council’s existing system, the
calculations shall clearly demonstrate the adequacy of the existing drainage network to
accept the additional stormwater flows.

Should Council’s existing drainage system not be adequate, the applicant will be required to
either upgrade Council's system and/or provide on-site detention/storage tanks to reduce
peak flows.

Plans detailing the existing and proposed drainage network including plans and longitudinal
sections of pipeline, the location of pits, pipe invert and pit surface levels, junction details,
size and class of pipes, trench conditions and details of surface flow paths together with
tabulated hydrologic and hydraulic calculations that detail the drainage network and the
capacities of the various surface flow regimes shall be submitted to the Council for approval
prior to obtaining a Development Permit for Operational Works.

Where flows are in excess of 100 litres/second then a hydraulic grade line analysis will be
required.

Page 6 of 14

Document Set ID: 25012091
Version: 5, Version Date: 29/07/2026