20220109 - Geotech · OPW23/0182

                             PROPOSED RESIDENCE
                             21 MAHER TERRACE, SUNSHINE BEACH




Text Figure 5: View of the existing pool (LHS) and longitudinal cracking in Maher Terrace (RHS)


4.2      Topography
As illustrated in Text Figure 6 below, the site is located on the north-easterly facing flank of a ridge which
crests about 200 m to the west. An inferred ancient sand dune appears to crest slightly to the south-east of
the site, with an easterly trending natural drainage line commencing slightly to the north. 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°. Slightly steeper ground surfaces were observed to the north of the site, ranging
between about 15° and 18°. 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. Areas immediately surrounding the
residence were gently sloping (less than 3°), mostly supported by timber/block retaining walls. Unsupported
fill batters (less than 1 m high) were observed to the east of the residence, typically battered no steeper than
25°. The front of the property comprised moderately sloping driveway, being about 12°, down to gently
sloping ground adjacent to Maher Terrace (less than 5°).

Generally, no irregular surface features were noted across the subject site which would indicate global slope
instability.




                                                    Subject Site




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




16 July 2021
Report No. 21236-001-Rev0                              4