Attachment B - Geotechnical Analysis

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4.0 Lab Testing
Laboratory testing is summarised in Table 2.

Table 2: Laboratory Testing Summary
      Test
                   Depth (m)                  Material                  Shrink-Swell Index (%)
    Location
      BH1           0.0 - 0.5                   Sand                                    1*



5.0 Geotechnical Comments
Geotechnical comments are based on the factual findings of the investigation, best practice,
local experience, published correlations; however, are fundamentally founded in opinion and
this should be considered.

5.1 Earthworks and Site Preparation
The following comments are provided in relation to site preparation for earthworks.
•   The area should be stripped of uncontrolled fill, soft, overly wet, foreign, or otherwise
    deemed unsuitable material (material that is potentially compressible) down to a relatively
    stiff dry base ensuring no organics material is present.
•   Stripped areas must be inspected by the geotechnical testing authority (GTA) to ensure no
    soft spots or loose zones are present. This should be done with the use of a loaded body
    truck or 12 tonne roller as a minimum. Areas showing signs of movement under the action
    of the testing equipment should be either over excavated and replaced with select fill or
    conditioned onsite through tyning, blending or other suitable methods.
•   Although no standard exists for the moisture content of soils, it is recommended that the
    site soils be placed at or near optimum moisture content (OMC) for general earthworks
    operations. This increases efficiency during earthworks operations. A range of +/- 2% of
    OMC is recommend for general earthworks.
•    Where site soils are proposed for use as fill in other areas, won material will need to have
    a maximum particle size of 75 mm or be observed to break down under the energy of
    compactive equipment.
•   Fill materials should be placed in relatively horizontal layers with a maximum placement
    thickness of 200 mm. The materials should be compacted to a minimum dry density ratio
    of 95% relative to Standard compactive effort.
•   Highly plastic clays at this site will be very sensitive to the presence or lack of moisture and
    therefore care should be used to place the material within the range nominated and to a
    maximum dry density of 102% relative to Standard compactive effort. Where this does not
    happen, the material could readily swell, soften, or be subject to significant trafficability
    issues.



09 Feb 2021                                                          Proposed Residential Dwelling