PTG_00259 - 0001 - Rev0 - Geotechnical Investigation Report (1)

                                                                                                          PTG Consulting
                                                                                                     ABN: 89 668 880 448
                                                                                               www.ptgconsulting.com.au




                                                pH(fox) measurements
                 0

                0.5

                 1
    Depth (m)




                1.5

                 2

                2.5

                 3
                      0   1   2      3     4      5     6      7      8     9      10     11       12      13       14
                                                       pH(fox) (pH units)

Figure 5: Field pHfox test results


                                         Change in pH following oxidation
                 0

                0.5

                 1
    Depth (m)




                1.5

                 2

                2.5

                 3
                      0       1            2            3             4             5                6               7
                                                       pH(fox) (pH units)

Figure 6: Change in pHfox following oxidation

Chromium suite testing was undertaken on selected samples by a NATA accredited laboratory in accordance
with the ‘Queensland Acid Sulfate Soils Technical Manual, Soil Management Guidelines v4.0, 2014’. The action
criteria for existing plus potential acidity calculated in units of percent-sulfur equivalents (e.g. s-TAA + s-SNAS +
SCR in % S units), is 0.03%S for a course texture sand and 0.1%S for a fine texture clay in excavations under 1000
tonnes. The results of the chromium testing are attached in Appendix 3 and are summarised in Table 3 below.




PTG/00259 – 25 Wyuna Drive, Noosaville                Page 9 of 15                                        28 June 2024