14169-001-Rev0 17 Webb Rd -Revised Draft · 132002.220527.1

                             17 WEBB ROAD, SUNSHINE BEACH
                             PROPOSED RESIDENCE

3.0      AIMS & METHOD OF INVESTIGATION
The main aims of the investigation are to address geotechnical (including slope stability) issues for the
proposed residence, with our report prepared to address the requirements of the relevant Noosa Shire
Council (NSC) codes and policies.

3.1      Fieldwork
An experienced geotechnical engineer from Tectonic undertook a site walk-over on 16 February 2015 to
make a visual assessment of surface features relevant to the geotechnical investigation. The walk-over
included assessment of soil and rock outcrops, surface drainage conditions, topography, evidence of
erosion, condition of existing/surrounding structures, and vegetation coverage/condition.

This was incorporated with a subsurface investigation comprising three boreholes (designated BH1 to BH3)
drilled using hand auger equipment to depths of up to 3.2 m below ground level (BGL). Dynamic cone
penetrometer (DCP) testing was conducted adjacent to, and within, the boreholes, and at one additional
location (DCP1), to enable estimation of the in situ soil strength.

Disturbed soil samples were taken from the boreholes for laboratory testing. The boreholes were backfilled
with drilling spoil to the surface upon completion.

The fieldwork was undertaken in the presence of an experienced geotechnical engineer from Tectonic.
Borehole and DCP reports, along with explanatory notes, are presented in Appendix A. Borehole and DCP
locations are shown in the Figure 1 (at end of text).

3.2      Laboratory Testing
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One disturbed soil sample recovered from borehole BH1 was dispatched to Geotech (SC) Pty Ltd, a NATA
accredited geotechnical laboratory located in Kawana, for geotechnical testing. Laboratory testing was
undertaken in accordance with Australian Standard AS1289 Method for Testing Soils for Engineering
Purposes and comprised Particle Size Distribution analysis to assess the soil classification. Laboratory test
results are summarised in Section 5.3. The laboratory test certificate is attached in Appendix B.
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4.0      THE SITE
The site is described as Lot 1 on RP151243 and covers an area of 2,015 m². A ‘handle’ provides access
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from Webb Road to the west, with surrounding properties occupied by one to two storey residences.
Foredunes leading down to Sunshine Beach are located to the west. Text Figure 2 illustrates the site
position and surrounding development. Text Figure 3 shows the topography of the broader area.




Text Figure 2: Aerial image of site and surrounding area (courtesy Queensland Globe)

26 February 2015
Report No. 14169-001-Rev0                              2