Reference Document - OPW25 0085 (AS Published)

                     7.3.4           Maintenance and Inspection ............................................................................................................ 26
                     7.3.5           Water Resource Catchment Overlay .............................................................................................. 27
8.        Limitations ............................................................................................................................................................ 27

Tables
Table 1: Summary of Subsurface Profiles ................................................................................................................................ 9
Table 2: Summary of Quality of Materials Testing............................................................................................................. 11
Table 3: Stability Risk Levels ....................................................................................................................................................... 13
Table 4: Details of Qualitative Risk Assessment for Property (AGS 2007) ................................................................ 14
Table 5: Retaining Wall Design Parameters.......................................................................................................................... 21

Text Figures
Text Figure 1: Conceptual subdivision layout, courtesy of IPS........................................................................................ 1
Text Figure 2: Conceptual earthworks plan for the subdivision, courtesy of Walsh ............................................... 2
Text Figure 3: 2025 aerial image of the site and surrounds (courtesy of Nearmap imagery) ............................. 4
Text Figure 4: North-easterly view across proposed Lots 8, natural drainage line behind .................................. 5
Text Figure 5: Oblique drone image of the site looking south-west along the central ridgeline ..................... 5
Text Figure 6: Looking east across the natural drainge line, drone image................................................................. 6
Text Figure 7: Drone image looking north, towards Hoy Road ...................................................................................... 6
Text Figure 8: Image showing ground surface contours (courtesy of QGlobe)........................................................ 7
Text Figure 9: Extract from Gympie Surface Geology Map .............................................................................................. 8
Text Figure 10: Typical subsurface profiles TP1 - sandstone (LHS) and TP7 - siltstone (RHS) .......................... 10
Text Figure 11: Extract from SCC landslide hazard overlay mapping ......................................................................... 12
Text Figure 12: Slope/W analysis output for proposed residential construction – short term
      conditions .............................................................................................................................................................................. 15
Text Figure 13: Footing depth required to minimize risk of undermining and surcharging ............................. 20
Text Figure 14: Location of site relative to Mary River ..................................................................................................... 27



Figures
Figure 1: Site Plan

Appendices
Appendix A                      Test Pit Logs & Explanatory Notes
Appendix B                      Geotechnical Laboratory Test Certificates
Appendix C                      AGS Guidelines – Qualitative Terminology for Use in Assessing Risk to Property
Appendix D                      Limitations




Geo-Environmental Investigation for Proposed Subdivision
7 February 2025 | 24386-001-Rev0                                                                                                                                                               v