080624 2383-01 FINAL Engineering Report for DA.pdf [As Published] · 132008.1128

Job Number: 3381 PROPOSED AGED CARE FACILITY, SUNRISE BEACH

5.0

6.0

7.0

8.0

9.0

10.0

Subsurface Profile

The borehole logs indicate that the subsurface profile at the site
was relatively uniform, with only silty sands and clean sands
encountered at all test locations.

Groundwater

A groundwater level was noted in borehole 4 which is located in
lower area of the site. Dewatering of excavations would be
required below any groundwater level.

Allowable Bearing Capacity

The results of the fieldwork indicate that the near surface
foundations at the site will provide an allowable bearing capacity
of less than 100kPa.

Generally, the test results indicate that an allowable bearing
capacity of 100kPa would be provided by the medium dense
strata shown on the borehole log sheets.

Topsoil Stripping Depth

Based on the results of the fieldwork, it is estimated that
between 300mm and 400mm of topsoil would need to be
removed from the site to expose a suitable subgrade surface for
construction.

Pavements

Two soaked California Bearing Ratio (CBR) tests were performed
on soils sampled from likely positions for pavement
construction, and the soaked CBR results were 16% and 17%.

The subsurface soils at the site were relatively uniform in all
areas tested and it is suggested that a conservative nominal
design soaked CBR value of 12% may be appropriate for
pavement design at the site.

Suitability of On Site Soils for Filling

The subsurface soil at the site is poorly graded dune sand. This
type of soil exhibits desirable engineering properties, provided
that it is adequately compacted and confined.

DATE PREPARED: 15/5/2008