07/0616 - Response to Information Request [As Published] · 132007.616

The classification has been calculated from test work performed on the soil profile encountered on the
day of our fieldwork and consideration of AS2870-1996. The 'P’ classification relates to the loose sands
encountered in the upper profile of our test sites. Any disturbance of the soil profile, may result in a
change to the classification. The attached design, has allowed for the influence of the earthworks
described in section 5.0 below.

Any disturbance of the soil profile, may result in a change to the classification. The attached design, has
allowed for the influence of the earthworks described in section 5.0 below.

3.0 SITE DESCRIPTION:
The construction area has a gradient in the order of 8%.
Vegetation on the construction area (and nearby surrounds) consists of grasses and scattered trees.

The existing surface drainage is good and sub-surface drainage is good.

4.0 FINDINGS: .
The soil profiles encountered are shown on the attached log sections.
No water table was encountered during our testing program.

The sandy soils encountered are susceptible to collapse when unconfined. This may effect excavations
and result in additional earthworks and increased concrete volumes. For further information please refer
to the attached critical line diagram.

The samples classified on site were assessed as having low to negligible plasticity, therefore laboratory
testing was considered unnecessary.

For buildings within the scope of AS 2870-1996, safe bearing 100KPa is available at 300mm into the
NATURAL MEDIUM DENSE SANDS. This strata is shown shaded on the attached logs

5.0 SITE PREPARATION DETAILS:

We recommend scraping this site free of all organic material and debris, then cutting and filling the
construction area to form a level pad. The fill should be clean material from the cut, laid out in 150mm
(maximum) layers and tracked rolled with the excavator (six passes in each direction) and extended out
2.0m (minimum) from the building footprint. Cut batters of 1 to 2 (vertical to horizontal) and fill batters of 4
to 3 will be stable providing all fill is compacted as above and exposed banks are protected against
erosion. The earthworks must incorporate surface spoon drains at the base and on the high side of the
cut. Both drains must have an efficient outflow downslope and clear of the dwelling.

Where a retaining wall is required, a cut batter of 1 to 2 (vertical to horizontal) in the sand profile taken
from the base of the proposed wall should be excavated. These earthworks must incorporate shallow
surface spoon drains at the base and along the high side of the cut. Drains must have an efficient outflow
down-siope and clear of the construction area. The exposed face should also be protected against the
potential for stormwater erosion. Should these recommendations be un-achievable the builder should
seek guidance from this office on temporary shoring, benching or other suitable techniques.

Areas where existing structures or trees are removed shall be backfilled with engineer approved fill
material compacted in accordance with AS2870-1996, or alternative measures to be provided by the
engineer.

Any loose or soft material uncovered in the site preparation shall be removed and replaced with approved

fill material compacted in accordance with AS2870-1996, or alternative measures to be provided by the
engineer.

SCG CONSULTING ENGINEERS 2 SCG Ref: 17177(S)