Appendix D - Geotechnical Report

9.        Limitations ............................................................................................................................................................ 25

Tables
Table 1: Summary of Soil Classification & Shrink-Swell Index Testing ...................................................................... 12
Table 2: Stability Risk Levels ....................................................................................................................................................... 14
Table 3: Details of Qualitative Risk Assessment for Property (AGS 2007) ................................................................ 15
Table 4: Retaining Wall Design Parameters.......................................................................................................................... 20
Table 5: Required EAAs ................................................................................................................................................................ 23
Table 6: Setbacks for subsurface land application area for on-site sewage treatment plant ........................... 23
Table 7: Setbacks for surface irrigated land application area for on-site sewage treatment plant ................ 23
Table 8: Setback distances for on-site sewerage facilities (Protection of surface and groundwater) ............ 24

Text Figures
Text Figure 1: Extract of sketch layout plans (courtesy MWA) ........................................................................................ 2
Text Figure 2: 2025 aerial image of the site and close surrounds (courtesy NC Intramaps) ............................... 4
Text Figure 3: Oblique aerial view looking south across site ........................................................................................... 5
Text Figure 4: Site layout (courtesy MWA) and aerial view of Lot 1, looking south ............................................... 6
Text Figure 5: Site layout (courtesy MWA), aerial view (centre) and looking north along spur (RHS)............. 7
Text Figure 6: View of western shed gable ............................................................................................................................. 7
Text Figure 7: Site layout (courtesy MWA) existing residence (centre) and general view looking
      north over spur (RHS) ......................................................................................................................................................... 8
Text Figure 8: View of concrete water tanks to east of house (LHS) & spearated apron slab (RHS)................ 9
Text Figure 9: Site layout (courtesy MWA) and oblique aerial view looking south................................................. 9
Text Figure 10: Site layout (courtesy MWA) and looking north along spur within proposed buiding
      area (RHS) .............................................................................................................................................................................. 10
Text Figure 11: Extract of Gympie Surface Geology Map................................................................................................ 11
Text Figure 12: Extract from NC landslide hazard overlay mapping ........................................................................... 13
Text Figure 13: Slope/W Analysis output (critical plane indicated) ............................................................................. 16
Text Figure 14: Footing depth required to minimise risk of undermining and surcharging ............................. 19

Figures
Figure 1: Site Plan

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




Geotechnical Investigation
10 June 2026 | 26073-001-Rev0                                                                                                                                                                 iv