Slope Stability Assessment

The spur becomes narrow beyond this, with a number of drainage lines shedding to the north and south.
Therefore, the catchment is limited to the site, and would be reduced further by the divergent shape of
the spur crest and shallow gradients. Thus waters would be spread slightly, with little or no hydraulic
acceleration towards the site.
While the spur of the rounded spur on which construction is proposed was relatively shallow in gradient,
and wide, it is acknowledged that within a short distance there would be positive gradients away from
the future develop areas.
No signs of significant erosion or exposed soil was observed in the vicinity of the proposed buildings, or
existing slopes and earthworks batters in existing garden areas.

2.5      Vegetation
Around the south-western corner of the block there were a mixture of grazed and slashed, maintained
paddocks. To the southern edge of the existing shed (where the stables are proposed) were small
orchard trees, and slightly larger mature trees were located along the southern edge of the earthworks
footprint for the proposed residence. Around the existing residence, a mixture of overgrown gardens and
garden beds were observed, with some medium size trees closer to the house.
On the steepest slopes observed during our walk-over near the development area (up to 10° to the
north-east, where effluent disposal is proposed) there were tall, mature bunya and gum trees. The trees
were not notably leaning or otherwise distorted in their growth, such that signs of slope instability could
be inferred.

2.6      Buildings and Other Structures
The existing residence was accessed via. an unsealed driveway off Lukes Road, which ran past the existing
shed, and along the southern edge of the building footprint for the proposed residence.
The existing residence consisted of a single main level, being on ground to the east, and with an
undercroft installed to the west. The house had rendered masonry block walls, with timber suspended
verandahs to the northern/north-western edge. A smaller shade house was located to the north-east of
the residence, with a concrete floor slab, timber framing and walls and a sheetmetal roof. Beyond this,
were in-ground concrete water tanks.
As mentioned above, an in-ground pool was noted to the north of the house, in an area of fill. The pool
had a concrete shell and tiled coping, and did not appear to be cracked or leaking.
The existing structures on site appeared to be in relatively good condition from a slope stability
perspective, with no leaning, bulging, cracking or other structural distress observed that could be
attributed to slope instability.


3.       Assessment of Land Stability
3.1      Existing Conditions
NC landslide susceptibility mapping (Ref. extract in Text Figure 8, overleaf) indicates that the sites of the
proposed buildings mostly have a Low/Very Low susceptibility to landslide (no shading) with some
isolated areas of Moderate susceptibility to the north, on the lower flanks and invert of the central
drainage line.




13 February 2026
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