Landslide Hazard Report_compressed

Specialists in transport geotechnics

Slow, creeping landslides and historic events may be recognisable by consistently bent trees; as
the ground moves and tilts the trees will continue to grow near vertically, which can lead to a kink
in the trunks – this will be exhibited by a number of trees and single specimens are not likely
representative of slope movements. Creep and lateral spread in low-angle slopes may be seen
by linear irregularities in the slope.
Historic landslides may also be picked up in high-resolution topographic maps: downslope lobes
and hummocks can often be seen, and when combined with irregularities in the slope and gullies,
can identify areas which warrant further investigation.
Anthropogenic features may also be disturbed by landslides; powerlines may be tilted, retaining
walls can bulge, roads and railway lines may show cracking and offset.
Sometimes, areas which are in danger of developing landslides can be picked up by the
formation of tension cracks and the presence of springs and altered drainage, however, for the
most part these areas need to be assessed by considering a combination of slope angles,
material types and assessing the risk from historical records and context.

3 EXISTING SITE CONDITIONS
Information on existing site conditions during this initial assessment have been gathered from the
following information sources:
   •   Desktop study
   •   Non-intrusive site investigation comprising of a site walkover and assessment.
Refer below for summary details.

3.1 Desktop Study
A desktop study has been conducted to examine and report available geotechnical information
associated with the proposed development and surrounds. Refer below for details.

3.1.1 Detailed Surface Geology
With reference to Queensland Governments “GeoResGlobe” 1:100,000 scaled detailed surface
geological mapping, Figure 4 below identifies the surrounding geology of the proposed site (416-
411 Black Pinch Road). The overlay indicates the property is overlain by the Kin Kin Beds (Rk).




10 May 2022                        CGC-SR-2022-011-R01-Rev01                                 Page 7