RFI - Attachment C - Slope Stability Assessment and Geotechnical report · MCU20/0026

Project No. 1-22543                                                                                                          Page | 7
June, 2020
Ref: 1-22543, 2020-05-20, BR SSA VER 1
Sanya Holdings – Slope Stability Assessment and Geotechnical Report - Proposed Residence, 40 Park Crescent, Sunshine Beach




           3.6.2       Groundwater and Seepage

Groundwater seepage was not noted during the site investigation. However, seepage through
the upper granular material and along the fill/natural interface may be expected during and
following periods of rainfall.

           3.6.3       Laboratory Testing

Due to the subsurface profile of sands intersected, no laboratory testing was carried out.
Samples were retained should any future testing be required.

    3.7 Evidence of Possible Instability
Existing Land Slips

No obvious visual evidence of landslide instability was noted on the site at the time of the site
walkover and investigation.

A review of air photos of the site does not indicate any likely areas of medium to large scale
instability on the natural slopes. Any existing small areas of instability would not be able to be
detected using this method due to photo scale.

Surface Scour

Minimal evidence of surface scour was noted on the site, generally located within the exposed
sand surface beneath the existing residence. The majority of steeper areas were generally well
vegetated but overland flow paths could still produce continual scour paths during major rain
events.

Soil Creep

Slight leaning and/or bowed trunks of trees are generally considered to be indicative of soil
creep, with the affected trees being progressively tilted by the slow movement of soil down the
slope. The degree of tilting or bowing of these trees is considered to be a sign of relatively
minor movements, and is typical for trees growing on such a steep slope. Rapid or gross
movements of soil downslope would be likely to uproot or kill the trees.

The small to medium sized trees on the existing natural slopes showed minor (if any) signs of
curved or bowed trunks.




                                                                                                               SOIL SURVEYS