Attachment 2 - Geotechnical Stability Assessment

                                                     Notes Relating to this Report


Reports                                                other particles present (e.g. sandy clay) as set
                                                       out below:
The report has been prepared by qualified
personnel, is based on the information                         Soil
                                                                                   Particle Size
obtained from field and laboratory testing, and           Classification
has been undertaken to current engineering             Clay                less than 0.002mm
standards of interpretation and analysis.              Silty               0.002 to 0.06mm
                                                       Sand                0.06 to 2mm
                                                       Gravel              2 to 60mm
Every care has been taken with the report as it
relates  to     interpretation   of   subsurface
                                                       Non-cohesive soils are classified on the basis of
conditions,     discussion    of    geotechnical
                                                       relative density which can be correlated from
conditions and contains recommendations or
                                                       the results of Standard Penetration Test (SPT) as
suggestions for design and construction.
                                                       below:
However, unexpected variations in ground
conditions will occur. The potential for this will
                                                                                   SPT ‘N’ Value
depend partly on testing, spacing and                  Relative Density
                                                                                  (blows/300mm)
sampling frequency.                                    Very Loose          less than 4
                                                       Loose               4 – 10
If variations are identified, Pacific Geotech          Medium Dense        10 – 30
would be pleased to assist with additional             Dense               30 – 50
investigations or advice to resolve the matter.        Very Dense          greater than 50

Copyright                                              Cohesive soils are classified on the basis of
                                                       strength (consistency) and can be quantified
This report is the property of Pacific Geotech         by the Pocket Penetrometer test, Vane Shear
Pty Ltd. The report may only be used for the           test,    laboratory testing   or  engineering
purpose for which it was commissioned and in           examination. The strength terms are defined as
accordance with the Terms of Engagement of             follows:
proposal. Unauthorised use of this report is
prohibited.                                                                  Unconfined Compressive
                                                        Classification
                                                                                    Strength kPa
Borehole and Test Pit Logs                             Very Soft           less than 25
                                                       Soft                25 - 50
The borehole and test pit logs presented in this       Firm                50 – 100
report are an engineering and/or geological            Stiff               100 – 200
interpretation of the subsurface conditions, and       Very Stiff          200 - 400
                                                       Hard                greater than 400
their reliability will depend to some extent on
                                                       Friable             strength not attainable – soil
frequency of sampling and the method of                                    crumbles
drilling or excavation.
                                                       Rock types are classified by their geological
Interpretation of the information and its
                                                       names, together with descriptive terms
application to design and construction should
                                                       regarding weathering, strength, defects, etc.
therefore take into account the spacing of
boreholes or pits, the frequency of sampling,                               Planarity
and the possibility of other than ‘straight line’      CU                  Curved
variations between the test locations.                 DIS                 Discontinuous
                                                       IR                  Irregular
Description and Classification Methods                 PR                  Planar
                                                       ST                  Stepped
The description and classification of soils and        UN                  Undulose
rocks used in this report are based on AS 1726.

Soil types are described according to the
predominating particle size and behaviour as
set out in the attached Unified Soil
Classification Table qualified by the percent of



October 2017                                                                                       pg. 1