20220109 - Geotech · OPW23/0182

                                             PROPOSED RESIDENCE
                                             21 MAHER TERRACE, SUNSHINE BEACH

TABLES
Table 1: Summary of Subsurface Profiles ........................................................................................................................... 6

Table 2: Stability Risk Levels .............................................................................................................................................. 8

Table 3: Details of Qualitative Risk Assessment for Property (AGS 2007) ......................................................................... 8

Table 4: Retaining Structure Design Parameters .............................................................................................................. 16



TEXT FIGURES
Text Figure 1: Layout plan (LHS) and cross-sectional views (RHS) of proposed development, courtesy of Kelder............ 1

Text Figure 2: 2021 aerial image of the site and immediate surrounds (courtesy Nearmap imagery)................................. 3

Text Figure 3: View of the northern corner of the site, whilst drilling borehole BH1 ............................................................ 3

Text Figure 4: Panoramic view of the eastern edge of the site, looking west from Maher Terrace ..................................... 3

Text Figure 5: View of the existing pool (LHS) and longitudinal cracking in Maher Terrace (RHS) ..................................... 4

Text Figure 6: Site plan showing ground surface contours (courtesy Noosa Council ‘Intramaps’) ...................................... 4

Text Figure 7: Extract of Gympie Special 1:100,000 Geology Map ..................................................................................... 5

Text Figure 8: Medium strength sandstone exposed on upslope side of Seaview Terrace ................................................. 5

Text Figure 9: Extract from NSC landslide hazard overlay mapping ................................................................................... 7

Text Figure 10: Slope/W output for long term conditions.................................................................................................. 10

Text Figure 11: Slope/W output for short term conditions (with groundwater) ................................................................... 10

Text Figure 12: Footing depth required to prevent undermining....................................................................................... 14



FIGURES
Figure 1: Site Plan



APPENDICES
APPENDIX A
Borehole & DCP Reports & Explanatory Notes

APPENDIX B
Laboratory Test Certificate

APPENDIX C
AGS Guidelines - Qualitative Terminology for Use in Assessing Risk to Property
Some Guidelines for Hillside Construction

APPENDIX D
Limitations




16 July 2021
Report No. 21236-001-Rev0                                                             iv