Reference Documents - RAL22/0032

                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                and is superseded by this site-specific assessment.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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Document Set ID: 22374434
Version: 1, Version Date: 14/04/2023