Appendix D - Geotechnical Report

Downslope to the north-eastern corner of proposed Lot 1, an established dam was present, which was
holding water at the time of our assessment. The drainage line upstream was noted to be wet underfoot
at the base, but with no discernible flow. Some exposed soils were observed on the lower flanks of the
spur to the south, described as pale brown and pale grey silty clay, however in general the ground cover
was maintained and no signs of significant channelised erosion was observed.
Text Figure 4 provides some context to the above.




                                                Approx. spur
                                                crest on Lot 1




            Text Figure 4: Site layout (courtesy MWA) and aerial view of Lot 1, looking south

5.1.2        Proposed Lot 2
Proposed Lot 2 also featured a well defined spur running through the allotment, approximately from
south to north. However, the crest of the spur extends on to Lot 3 to the east. This means that at the
frontage, a drainage line head and upper gully ran oblique across the south of the proposed block,
potentially limiting access to a building location on the spur further down in to the lot. We understand
that ultimately a building envelope may be established on the drainage line flanks in the south-western
corner or considered on the spur crest further downslope to the north.
To the south-west of the block, the drainage line flanks were moderately steep, increasing from about 8°
at the road frontage to 13° downslope towards the drainage line invert. While the slope shape was
convex, the overall shape was approximately linear. This type of ground would naturally tend to promote
sheet flow of surface water, rather than cause concentrated/channelised run-off.
To the south-east of the proposed block a ‘pinch-point’ would potentially existing around the head of
the drainage line. An established track and shed were present, which could be utilised for access to the
spur further downslope, however on the downslope side there was sloping ground of up to 18°.
The spur downslope included a relatively wide crest area (~30 m) which dipped at 8° to 9°, and the flanks
which extended to between 15° and 18°. The rounded crest of the spur would help to shed water in a
divergent manner, with positive gradients available down and away from proposed building areas to the
north, east and west.




Geotechnical Investigation
10 June 2026 | 26073-001-Rev0                                                                              6