Att 9 - Geotech and PASS report

                                                                                             Page 4 of 13




6.2      Compaction and Soaked CBR Testing

A Standard compaction and single point soaked California bearing ratio (CBR) test was undertaken on
a bulk sample recovered from Bore 1. The sample was first screened over the 19 mm sieve, as
required by the test standard, then compacted to 98% Standard dry density ratio and soaked for four
days under a 4.5 kg surcharge.

The results of the compaction and CBR testing are summarised in Table 2 with a material test report in
Appendix D.

Table 2: Results of Compaction and CBR Testing
 Bore      Depth           Material            MDD            OMC    Swell     CBR
                                                   3
 No.        (m)                                (t/m )          (%)    (%)      (%)
     1     0.2-0.7        Silty sand            1.69          13.5    0.0       35
Where MDD = Maximum Dry Density, OMC = Optimum moisture content




6.3      Acid Sulfate Soils

Samples were recovered from selected bores at 0.25 m depth intervals to 2.0 m depth and were
screened by measurement of pH after the addition of distilled water (pH f) and peroxide (pHfox). The pHf
test provides a preliminary indication of past oxidation of sulfides resulting in the presence of actual
acid sulfate soils (AASS). The pHfox test provides a preliminary indication of the presence of
unoxidised sulfides and therefore, potential acid sulfate soils (PASS).

Based on the results of the screening tests and visual inspection of the samples, selected samples
were subjected to more rigorous Chromium Suite analytical testing. The results of this testing are
discussed further in Section 8.9 and detailed report sheets are provided in Appendix D.

Preliminary field screening and chemical laboratory tests for ASS were carried out with reference to
the QASSIT Guidelines (Ref 2), the Soil Management Guidelines (Ref 3) and the Laboratory Methods
Guidelines (Ref 4).




7.       Proposed Development

It is understood that the proposed development will consist of a single storey commercial building
                                                                                           2
surrounded by car parking and pavements. It is further understood that filling the 3,665 m site from
existing surface levels at around 1.3 m AHD up to design surface level of 2.5 m AHD is required.




Geotechnical Investigation, Proposed Commercial Development                           90151.00.R.001.docx
11-19 Hilton Terrace, Tewantin                                                                  May 2017