RFI - 21327-001-Rev0 Plover St

                             PROPOSED RESIDENCE
                             34 PLOVER STREET, PEREGIAN BEACH

4.5      Groundwater
No signs of groundwater seepage (‘springs’) were observed during our walk-over. Groundwater was not
encountered in the boreholes at the time of investigation. Groundwater conditions are expected to be
reflective of prevailing weather conditions and seepage may develop, particularly following periods of
prolonged or heavy rainfall.

4.6      Surface Drainage
Surface drainage would be expected to follow natural surface contours towards the eastern boundary. It is
noted that the site has a relatively large catchment; however, most runoff from upslope of the property is
anticipated to be intercepted by the existing stormwater infrastructure along Plover Street.

Given the sandy nature of the site, rainfall would normally be anticipated to infiltrate the ground surface.
However, as the proposed development will occupy a large part of the block, significant run-off from hard
surfaces will occur. Nevertheless, where directed into swales rather than pipes, such run-off would be
expected to infiltrate into the natural sands relatively rapidly.

No significant surface run-off features were noted during our assessment (e.g. deep rilling or scour/wash out
scars). This indicates that significant overland flow is generally absent during rainfall events.

5.0      SLOPE STABILITY ASSESSMENT
5.1      Existing Conditions
The Noosa Planning Scheme 2020 includes a landslide hazard overlay map (Ref. extract in Text Figure 7)
which indicates that most of the site is within a Very Low/Low (no shading) Landslide Hazard Area. Isolated
areas in the north-western corner and along the eastern boundary are mapped as being within a Moderate
(pale yellow shading) Landslide Hazard Area.




                                                               Approx. Site Location




Text Figure 7: Extract from NSC landslide hazard overlay mapping

It should be noted that the Noosa landslide hazard map is a broad-scale indication of the potential
landslide susceptibility and is superseded by this site-specific assessment. The allotment did not exhibit
any visible surface features which would indicate global slope instability during our walkover: no landslide
back scarps, noteworthy groundwater seepage or areas of naturally ‘hummocky’ ground were observed.
Medium dense sands were encountered at relatively shallow depth.




10 September 2021
Report No. 21327-001-Rev0                              5