Operational Works Report_RosesRd Access 29 April2025

                                                                                                      Callaghan & Toth
5.0 STATE ASSESSMENT AND OTHER MATTERS
5.1           Waterway Barrier Works
The works will involve crossing of Skyring Creek, which is mapped as a High Risk (Red) waterway
under Fisheries Mapping.

The Planning Regulation 2017, triggers assessment under Schedule 10, Part 6, Division 4 for the
proposed Waterway Barrier Works.

The current design details proposed waterway barrier works as follows:
   • Three reinforced concrete box culverts, two x 1800W x 900H RCBC and one central cell
       being 1800W x 1450H link slab.

The proposed works requires assessment against State Code 18 – see Appendix E.
5.1.1 Justification for Waterway Barrier Works
The owner of Lot 2 requires an independent access to this site. Current access arrangement for
Lot 2 is through Lot 1 RP56225, located at 14 Sankeys Road, Federal. Lot 2 has previously had
an access driveway and crossing of Skyring Creek, generally in the same location as the proposed
driveway and crossing.

5.1.2 Alternatives considered
The owner considered a number of options relating to alternatives to the proposed access to Lot 2
including:
    1.     No works – this was determined to be unsuitable, as independent access is preferred
           for this separate lot.
    2.     Low level crossing – this was considered not possible due to the high southern bank of
           Skyring Creek, requiring excessive earthworks to achieve the low level crossing and as
           such greater impacts to Skyring Creek.
    3.     Culvert crossing – as an access to one lot the use of box culverts is considered to be
           the most appropriate for the creek profile and cost to construct in this location. As such
           this is the preferred option of the owner.

5.1.3 Design Details
The crossing design plans are attached with the operational works application. The replacement
culverts will have the following features:

Table 10:              Culvert Design Features
      PARAMETERS                                                  Proposed Culvert
      Culvert Size (mm)                                   2 x 1800mm x 900mm RCBC; and
                                                           1 x 1800mm x 1450mm link slab
      Number of cells                                                      3
      Material                                      Reinforced Concrete box culverts with link slab
      Length (m)                                                         3.66
      Width (m)                                                           6.0
      U/S Invert level (AHD m)                              81.744 (RCBC’s – outer cells)
      – Apron edge                                         81.444 (link slab – low flow cell)
      D/S Invert level (m AHD)                              81.595 (RCBC’s - outer cells)



Operational Works Application – Supporting Information                                                April 2025
36 Roses Road, Federal                                                                                        27