RESPONSE TO FURTHER ADVICE -Geotechnical Report · MCU25/0054

                                                                                                                 PTG/02023 – 0001 – Rev1



                                  Field pH after Oxidisation (pHFOX) 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
                                                              pHFOX (pH units)

Figure 8: Field pH after peroxide (pHFOX) test results. The pink zone (pH < 3) indicates the possible presence of Potential ASS (PASS).


                                             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
                                                   Drop in pH after peroxide (pH units)

Figure 9: Change (drop) in pH following oxidisation. The pink area indicates a drop in pH of greater than 1.0 pH units.

After receiving the results of the above testing, a subsequent selection of samples was sent for further Chromium
Reducible Sulfur (CRS) testing. The results of the CRS testing will be presented in a revised report. At the time of
writing this report, the provided commentary is not deemed to be in accordance with QAASTM. Subsequent
investigation will need to be undertaken to ensure regulatory guidelines are met for the site.



8 GEOTECHNICAL COMMENTS
The geotechnical comments in this report are based on information collected during the fieldwork, common practice,
local experience and published literature; however, they are fundamentally opinions.

In summary, the ground conditions that are likely to be encountered at the site can be characterised as comprising a
surficial layer of topsoil, then silty sand. Further investigation will be required to provide sufficient commentary for the
proposed development.



                                                                                                                                      9