geotech

                                   PROPOSED UNIT DEVELOPMENT
                                   9 BOTTLEBRUSH AVENUE, NOOSA HEADS

4.2          Topography
As illustrated in Text Figure 6 below, the site is located on the south-westerly facing flank of an ancient sand
dune which crests about 200 m to the east/north-east. During the site walk-over, topographic features
specific to the site were noted, and ground slopes were recorded using a hand-held clinometer.

The natural surface profile had been interrupted by historic landscaping and residential construction; with
inferred unaltered ground slopes along the side boundaries measured at the time of our assessment of
between about 10° and 12°. Based on our observations it appeared that cut and fill earthworks in the order
of about 2 m deep and 1 m high had been undertaken across the site. To the rear of the residence the
ground surface was gently sloping, typically being less than 3°, with the north-eastern property boundary
supported by a timber sleeper wall about 1 m high and remaining areas primarily supported by the existing
residential building. The front of the property comprised a gently sloping carparking area, being less than 5°,
with the driveway continuing down to Bottlebrush Avenue at about 12°.

Generally, no irregular surface features were noted which would indicate global slope instability.




                                              Subject Site




Text Figure 6: Site plan showing ground surface contours (courtesy Noosa Council ‘Intramaps’)

4.3          Geology
Available geological information 1 indicates that the site is underlain by Pleistocene age dune sand
(Ref: Text Figure 7) and is near the contact with the older Noosa Quartz Diorite formation.




                                                      Approx. Site Location



Text Figure 7: Extract of Gympie Special 1:100,000 Geology Map



1
    Queensland Government, Department of Mines and Energy, 1:100,000 Gympie Special Geology Map, Sheet 9445 & Part 9545, 1999


13 July 2021
Report No. 21169-001-Rev0                                       4