Appendix B - Global Stability Assessment Report

                                                   -5-
                                                                                       Job No: ML21/188

All fill was observed to be placed in thin layers appropriate for the above plant carrying out several
passes (up and back). The fill was moisture conditioned during placement and thoroughly mixed to
achieve moisture contents suitable for compaction. Materials containing excessive amounts of silts or
deleterious materials such as sticks, or construction debris were sorted to remove contaminants prior
to placement or rejected for use.

Sloping areas requiring filling were benched and continually keyed into the slope prior to and during
placement. Some oversize particles may remain in the fill profile however are not considered to have
any consequence on the performance of the fill as a mass. This method of placement and compaction
was observed to be consistent for the entire thickness of fill.

Compaction Testing was carried out on the bulk earthworks fill materials in accordance with Table 5.1
and 8.1 of AS3798-2007 (Guidelines on Earthworks for Commercial and Residential Developments),
General Notes on Bulk Earthworks Plans and tested to AS1289 test methods (Testing of Soils for
Engineering Purposes). Testing achieved the required specification of 95% of the Hilf Density.

Fill placed and compacted at measured density ratios less than 95% were tyned, moisture conditioned
and re-compacted until the required specification was achieved. Retesting (if required) was carried out
using Random Stratified locations within the reworked areas.


Test reports are attached as Appendix A.

Test locations and levels were not obtained by survey and are therefore should only be considered as
approximate.


4.0     STATEMENT OF COMPLIANCE

Our representative observed all the relevant earthworks operations including the stripped surfaces,
filling operations and carried out compaction tests in accordance with the required standard. It is
confirmed that Level 1 Supervision in accordance with AS3798-2007 has been carried out on the bulk
earthworks for this project.

The fill and the top 150mm of the existing ground at The Site can be classed as Controlled as defined
in AS2870 (Residential Slabs and Footings).

Controlled Fill (Level 1) provides an overview that the earthworks specification has been met. There
are sites where long-term settlements of controlled fill can occur. Large total and differential settlements
can be expected where fill has been placed over soft and compressible soils and where the thickness
of controlled fill varies significantly.


5.0     EXCLUSIONS

This statement does not include any topsoil, which may be placed for use as lot dressing or any other
subsequent earthworks or trench backfill after 19th August 2021.

Our on-site attendance specifically excludes assessments of fill material quality and engineering
properties that are outside the requirements of AS3798-2007, including material quality such as soaked
CBR, site classifications and batter stability. The reactivity of this site to moisture content changes has
not been assessed by this commission. This aspect of the geotechnical characterisation of the site
should be checked by the design consultants.

Footings and ground slabs for any structures constructed over natural soils or compacted fill should be
designed to accommodate the characteristic ground surface movements and settlement potential.
Assessments of these design parameters are beyond the scope of this Report.

This report is not to be relied upon for settlement analysis and soft soils engineering advice. This is
beyond the scope of this report and outside our engagement.

3332 – Geoff Hussin                                                              MORRISON GEOTECHNIC
Tunba Court - Cooroy Mtn