Z40770_Response to InformationRequest_NC_final

No water table was encountered during our testing program.

We have calculated the following Ys value for the soil profile:

                                                 Ys = 40-45 mm

Excavatable rock was encountered at the following depths below our test surface level:

                                              Test Site 2 - 1500 mm

Our field testing did not encounter any unexcavatable rock, but we do anticipate stable unexcavatable rock at
relatively shallow depths beneath the base of our test sites.

Fill, which we have described as controlled was encountered to the following depths and overlays the entire
site.

                               Test Site 1 - 1200 mm           Test Site 2 – 1000 mm

The following foundation material will provide a safe bearing capacity (100 kPa) for buildings within the scope of
AS 2870-2011 and is shown shaded on the attached logs;

                   FOUNDATION MATERIAL - NATURAL STIFF SILTY CLAY

5       SITE PREPARATION DETAILS

Areas where existing structures or trees are removed shall be backfilled with engineer approved fill material
compacted to achieve a minimum relative field density of 95% and be in accordance with AS2870-2011.
Where trees are removed prior to construction the moisture conditions of the soils must be allowed to normalise
across the site prior to commencing foundation preparations.

Any loose or soft material uncovered in the site preparation shall be removed and replaced with approved fill
material compacted in accordance with AS2870-2011, or alternative measures to be provided by the engineer.

Site drainage during construction is important. Stormwater run-off should be diverted away from any
foundation excavations and not be able to pond within 5.0m of the building footprint. Temporary piping or
spoon drains or other practical methods should be used. Please refer to the Appendices to the rear of this
report for drainage management.

The final surface profile should fall away from any slab on ground for a minimum of 1.5m at a grade of no less
than 1 in 20. Refer to appendices for drainage recommendations.

Where site drainage and landscaping does not conform to the specifications of AS 2870-2011 and CSIRO
Information Service Sheet BTF-18 significant damage to the building can be expected. A single copy of this
document is issued with the original issue of this report. Please consult your builder or contact this office to
obtain a copy.

The builder must ensure the stability of neighbouring/existing structures is maintained through not
undermining their foundations. This is achieved via restricting any excavations to above a line
radiating downwards at an angle of 1 in 1.5 (vertical to horizontal) from the base of the
foundation/structure to be protected.

Any new vegetation including trees planted adjacent the structure should follow the recommendations
appended to this report.

Note:     As this is an “H” site, trees must be a distance equal to the mature height of the tree away
          from the house footings. Refer to appendices for recommendations for building near trees.




    SCG Consulting Engineers                               2                                  SCG Ref: 26232(S)