Appendix B - Driveway Slope & Stability Assessment (Tectonic)

Contour Consulting Engineers                                                                            23038-001-Rev0
                                                                                                          6 March 2023

3.0      ASSESSMENT OF LAND STABILITY
3.1    Existing Conditions
The Noosa Planning Scheme 2020 includes a landslide hazard overlay map (Ref. extract in Text Figure 8),
which indicates that most of the proposed driveway alignment has a Moderate (pale brown shading) and
High (orange shading) landslide hazard.




                                               Indicative Proposed Driveway Location




Text Figure 8: Extract from NC landslide hazard overlay mapping

It should be noted that the NC map is a broad-scale indication of the potential landslide susceptibility only
and is superseded by this site-specific assessment. At the time of our visit, the proposed driveway
alignment and immediate surrounds did not exhibit any indicators of global slope instability. No landslide
back scarps, groundwater springs, tension cracks, or areas of naturally ‘hummocky’ ground were observed.
The existing structures appeared to be in good condition.
Surface cracking was noted in an inferred fill batter to the north of the proposed driveway alignment, which
appeared to be related to soil shrinkage due to drying, rather than slope instability. Irregular, semi-circular
and convex shaped features were observed downslope (south-east) of the existing shed; however, these
features were well away from the proposed development area, on the opposite side of the spur, and not
relevant to the proposed works.




Text Figure 9: Inferred shrinkage cracking in fill batter near development area (LHS) and semi-circular feature to the
south of the existing shed (RHS)




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