Geotehnical Investigation Report · OPW22/0140

                               PROPOSED UNIT DEVELOPMENT
                               37 BOTTLEBRUSH AVENUE, NOOSA HEADS




                       2.2 m
                                                                      0.5 m

                                                                                       BH2




Text Figure 4: Brick retaining wall south of driveway (LHS) and southern terraced outdoor area (RHS)




                                                         Bottlebrush Avenue




Text Figure 5: Western frontage of the allotment (LHS) and distressed wooden retaining wall located
downslope of the unit building (RHS)



4.2       Topography
As illustrated in Text Figure 6 overleaf, the site is located on the south-westerly facing flank of an ancient
sand dune which crests about 230 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 less altered ground slopes along Berrima Row. The inferred natural slopes in the area were
measured at the time of our assessment between about 9° and 11°. Based on our observations it appeared
that cut and fill earthworks had been undertaken across the site, resulting in a generally flat building platform
supported by various retaining walls, as discussed in above in Section 4.1.

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




13 May 2022
Report No. 22151-001-Rev0                               4