Information Request RAL23 0021

Information Required
3. Provide a piped inlet into the proposed gully pit (Structure 1-5) in accordance with Revision
   D of External Roadworks Layout Plan 184-001-800 as referenced in Condition 18 of
   Attachment A of the P&E Court Appeal.


Issue – Retaining Wall Detail
Council requires additional detail of the three retaining wall types proposed across the site to
assess the application.
Information Required
4. Provide amended earthworks drawings including the cross-sectional typical details of each
   wall type proposed including the extent of subsoil drainage required and any additional
   construction notes.

   Note that all retaining walls that are publicly accessible and exceed 1.0m in height must
   be fitted with a commercial grade safety fence in accordance with Condition 36 of
   Attachment A of the P&E Court Appeal.


Issue – Filter Media Area
Table 11 of the Hydraulic Impact Assessment approved as part of Condition 2 of the P&E
Court Appeal nominates a combined filter area of 53m2 for the bioretention basins. The
submitted Plans only include 50m2 of filter area.
Information Required
5. Provide amended plans demonstrating that the recommended filter media area of 53m2
   can be accommodated in accordance with the approved Hydraulic Impact Assessment.

   Or alternatively,

   Provide an amended report with supporting modelling demonstrating that the reduced area
   is acceptable.


Issue – Bio Basin Access & Maintenance
Council has concerns with the maintenance and access locations for the proposed bio
retention basins given the steep batters proposed. Water by Design – Bioretention Technical
Design Guidelines (2014) recommends a limiting width of 10 meters from the access point
and bio basin perimeter when construction and maintenance access is available from one
side. The distance from the end of the shared driveway to the far perimeter of Bio Basin 1 is
approximately 16m.
Information Required
6. Provide amended plans nominating the access point for each bioretention basin and
   demonstrate that the minimum access and maintenance requirements of Water by Design
   – Bioretention Technical Design Guidelines (2014) can be achieved.


Issue – Open Drain Access & Maintenance
It is unclear how drainage easements A, B, C & D are able to be accessed internally within
the site for maintenance purposes given the extensive earthworks and associated retaining
walls proposed.



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