RFI -Attachment 6 - Geotechnical Investigation Report CORE.pdf

Walsh Consulting Engineers



Table 1: Summary of geotechnical classification testing.
                               Depth                                                                                                         Fines
     Borehole
                                       To                Soil description                     CBR (%)                ECN       Sand (%)    (Clay/Silt)
       no.              From
                                                                                                                                              (%)
                         (m)          (m)
        BH1              0.6           1.1          SAND (POSSIBLY FILL)                            -                    -        95           4
                                                        SAND (POSSIBLY
        BH2             0.05           0.4                                                          16                   -          -           -
                                                         AEOLIAN SOIL)
        BH4              1.5           2.3          SAND (AEOLIAN SOIL)                             -                    5          -           -

        BH5              0.1           0.7                  SAND (FILL)                             11                   -          -           -

        BH6              0.4           1.1          SAND (AEOLIAN SOIL)                             10                   -          -           -
                                                        SAND (POSSIBLY
        HA1              1.2           1.9                                                          -                    -        93           3
                                                         AEOLIAN SOIL)


Classification testing generally confirms the field descriptions.
Table 2: Summary of soil aggressivity testing.
                                Depth
       Borehole                                                                                              Sulfate         Chloride     Resistivity
                                                         Soil description                     pH
         no.               From         To                                                                   (mg/kg)         (mg/kg)       (ohm.m)
                            (m)         (m)
          BH6               0.4         1.1         SAND (AEOLIAN SOIL)                       6.1               < 30           <5            2100


These results are discussed in Section 6.6.

5.0            INVESTIGATION FINDINGS
5.1         Published Geological Information
Available geological mapping1 indicates that the site is underlain by Quaternary age “Pleistocene dune:
quartz sand” (Qpd2)
Image 4 below shows an extract from the geology map.




                                                                                                         Approximate site location




Image 4: Extract from Gympie Special 1:100,000 geology map.




1
    GYMPIE SPECIAL 1:100,000 Geology Map, Sheet 9445 and part 9545, First Edition 1999, Department of Mines and Energy



J001390-001-R-Rev0                                                             5