Geotehnical Investigation Report · OPW22/0140

                                             PROPOSED UNIT DEVELOPMENT
                                             37 BOTTLEBRUSH AVENUE, NOOSA HEADS

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

Table 2: Stability Risk Levels .............................................................................................................................................. 7

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

Table 4: Retaining Structure Design Parameters .............................................................................................................. 14



TEXT FIGURES
Text Figure 1: Cross-sectional view (RHS) and basement layout plan (LHS), courtesy PCA Architects ............................. 1

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

Text Figure 3: Panoramic view of the existing unit block ..................................................................................................... 3

Text Figure 4: Brick retaining wall south of driveway (LHS) and southern terraced outdoor area (RHS) ............................ 4

Text Figure 5: Western frontage of the allotment (LHS) and distressed wooden retaining wall located downslope
          of the unit building (RHS) ................................................................................................................................... 4

Text Figure 6: Plan showing ground surface contours (courtesy Noosa Council ‘Intramaps’) ............................................. 5

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

Text Figure 8: Extract from NSC landslide hazard overlay mapping ................................................................................... 7

Text Figure 9: Slope/W output for long term conditions...................................................................................................... 9

Text Figure 10: Footing depth required to prevent undermining....................................................................................... 13



FIGURES
Figure 1: Site Plan



APPENDICES
APPENDIX A
Borehole Reports & Explanatory Notes

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

APPENDIX C
Limitations




13 May 2022
Report No. 22151-001-Rev0                                                             iv