Geotech

                              PROPOSED UNIT DEVELOPMENT
                              27 BOTTLEBRUSH AVENUE, NOOSA HEADS

In-situ testing, using the dynamic cone penetrometer (DCP) method, was carried out from the ground surface
and within each borehole. Boreholes were backfilled on completion using spoil arising during drilling, with
excess material slightly mounded at surface.
Laboratory testing was not warranted due to the sandy nature of the subsurface conditions encountered.

Borehole locations are shown in Figure 1 attached at the end of this report, with borehole and DCP logs
presented in Appendix A, together with explanatory notes. Borehole coordinates were recorded using a
handheld global positioning system (GPS).

The results of the desk-top study and walk-over survey are included in Section 4 below.


4.0      RESULTS OF INVESTIGATION
4.1      Site Description
The site is formally described as Lot 138 on RP88934, covering an area of about 506 m2, with frontage to




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Bottlebrush Avenue along the south-western boundary. At the time of the investigation a single storey
residence occupied most of the eastern part of the site, with an asphalt and concrete driveway providing
direct access off Bottlebrush Avenue. Most of the ground surface around the existing residence was
terraced by timber sleeper, concrete block and loosely stacked boulder walls typically ranging between about
1 m and 1.5 m high.
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Based on a visual assessment the existing building was noted to be in good structural condition exhibiting no
obvious signs of distress (e.g. cracking, misalignment, etc.). Dilapidation was evident across the existing
driveway and retaining walls (cracking, bulging, misalignment), which appeared to be related to age, poor
construction and possibly consolidation of the upper loose sands.

Similar residential unit developments and houses occupied properties to the north, south/east and west of
the site. It appeared that the surrounding buildings comprised mostly at grade carparking, with the lower
level partially excavated into the hillside. Based on a visual assessment, it appeared that excavations up to
about 3 m deep had been undertaken on neighbouring properties. Observable walls appeared to be in
relatively good structural condition, based on an external assessment. It was noted that part of a concrete
kerb and channel on the opposing (southern) side of Bottlebrush Avenue displayed misalignment, with
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cracking evident in the Bottlebrush Avenue asphalt seal. It appeared that this distressed was due to
consolidation of fill materials, which are inferred to have been placed during the construction of the road.

A 2021 aerial image of the site and surrounds is shown in Text Figure 2.
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                                                    Subject Site




Text Figure 2: 2021 aerial image of the site and immediate surrounds (courtesy Nearmap imagery)



10 November 2021
Report No. 21286-001-Rev0                                2