SUPERSEDED Compiled Reference Document - MCU24 0153 & OPW24 0202 (As Published)

        4.4             Subsurface Conditions
        Detailed descriptions of the subsurface conditions encountered in the boreholes are provided in the
        borehole reports attached in Appendix A, along with definition sheets which describe terms and
        abbreviations used on the reports. The subsurface conditions encountered in the boreholes are
        summarised as follows:
        ▪     Topsoil – comprising loose silty sand to depths of 0.1 m to 0.2 m below ground level (BGL); then
        ▪     Fill – comprising loose silty sand to depths of between 0.4 m and 0.1.3 m BGL; then
        ▪     Natural Sands – comprising poorly graded sands mostly being loose to depths of between 1.4 m
              and 2.6 m BGL; then becoming medium dense and increasing to dense below depths of about
              2.8 to 3.8 m BGL.
        Table 1 below summarises the subsurface profile in each borehole.

        Table 1: Summary of Subsurface Conditions

                                                                                                Medium         Dense (or
            Borehole No.        Topsoil             Fill                 Loose Sands
                                                                                                Dense Sands    denser) Sands
                                0.0 – 0.2           0.2 – 0.4            0.4 – 1.5              1.5 – 2.8      2.8 – 8.0TD
            BH1


                                0.0 – 0.1           0.1 – 0.4            0.4 – 1.4              1.4 – 3.0TD    3.3* – 4.7DCP
            BH2


                                0.0 – 0.1           0.1 – 1.3            1.3 – 2.6              2.6 – 3.0 TD   3.7* – 4.8DCP
            BH3


            BH4                 0.0 – 0.1           -                    0.1 – 1.7              1.7 – 3.0TD    3.8 – 4.8TD
        Notes: 1.           Depths noted in m BGL at time of investigation (22 February 2022)

        2.        NE denotes not encountered

        3.        TD denotes borehole terminated at target depth


        4.        * inferred from DCP testing

        5.        DCP denotes DCP termination depth




        A site classification ‘soil test’ report by Australian Soil Investigations (ASI) (Ref. Report No. 230154(S),
        dated 12 June 2023) comprised the drilling of two boreholes (designated BH1 and BH2) in accessible
        locations to the east of the property. Rubbish was noted by ASI in BH2 at a depth of 0.7 m BGL. Three
        boreholes (designated BH2, BH2A and BH2B) were drilled by Tectonic in this area to delineate the extent
        of this rubbish, however, no deleterious material was encountered at those locations.
        ASI has classified the site as Class P, as per AS2870, due to poor bearing capacity and fill; however, has
        stated that the site would have the shrink-swell characteristics of a Class S site.




        Proposed Unit Development
        30 September 2024 | 24265-001-Rev0                                                                                     6
Document Set ID: 23376055
Version: 1, Version Date: 28/11/2024