Att 9 - Geotech and PASS report

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2.     Site Description

The site is located at 11-19 Hilton Terrace, Tewantin (refer to Drawing 1 in Appendix B). The site is
bounded by Hilton Terrace to the north, Ernest Street to the east and Earl Street to the west.

At the time of investigation the site was occupied by existing commercial developments consisting of a
number of buildings and detached sheds, surrounded by pavements.




3.     Regional Geology

Reference to the Geological Survey of Queensland’s 1:100,000 scale geological maps indicate the site
is underlain by Pleistocene aged Estuarine channels and banks typically comprising “sandy mud,
muddy sand, minor gravel”.

The natural subsurface conditions encountered during the investigation comprised silty sand and
sandy/silty clays, inferred to be alluvial, which is considered to be consistent with the above described
geology.




4.     Field Work Methods

The field work was undertaken on 18 April 2017 and comprised the drilling and sampling of six bores
(designated Bores 1 to 6) to between 2 m and 6 m depth. The bore locations were set out with
reference to site features, with locations recorded using a hand-held GPS device and surface levels
interpolated from survey plan provided. The approximate bore locations are indicated on Drawing 1 in
Appendix B.

The bores were drilled using a 4WD mounted Jacro 200 drilling rig using continuous flight augers fitted
with a tungsten carbide (TC) bit. Strata identification was undertaken through observation of cutting
returns and recovered samples. Dynamic cone penetrometer (DCP) tests were carried out adjacent to
the bores to assess the relative density/strength consistency of the subsurface soils. On completion,
the bores were backfilled with drilling spoil after checking for groundwater.

The field work was undertaken by experienced geotechnical personnel who logged the bores,
collected disturbed samples for visual and tactile assessment and for subsequent laboratory testing.




5.     Field Work Results

The subsurface conditions encountered in the bores are given in detail on the borehole logs in
Appendix C, together with notes defining the classification methods and descriptive terms used. The
depths were measured below existing surface levels at the time of investigation.




Geotechnical Investigation, Proposed Commercial Development                            90151.00.R.001.docx
11-19 Hilton Terrace, Tewantin                                                                   May 2017