Reference Document - MCU26 0001 & OPW26 0002 - AS PUBLISHED · MCU26/0001

                                                                                     Approx. Site Location




                                Text Figure 7: Extract of 1:100,000 Laguna Bay Surface Geology Map


        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 very loose to loose organic sand, to a depth of 0.1 m BGL; then
              Fill – comprising loose sand, to depths of between 0.7 m and 1.1 m BGL; with underlying
              Natural Sands – comprising poorly graded sands, mostly being loose to depths of between 1.2 m
               and 1.7 m BGL; then becoming medium dense and increasing to dense below depths of between
               3.2 m and 3.6 m BGL.
        Table 1 below summarises the subsurface profile encountered.

        Table 1: Summary of Subsurface Conditions
                                                                                                        Medium Dense      Dense (or denser)
            Borehole No.               Topsoil                 Fill              Loose Sands
                                                                                                           Sands               Sands


                 BH1                   0.0 – 0.1            0.1 – 1.1              1.1 – 1.3                 1.3 – 3.3      3.3 – 4.8*DCP



                 BH2                   0.0 – 0.1            0.1 – 0.7              0.7 – 1.2                 1.2 – 3.2*     3.2 – 4.7*DCP



                 DCP3                                                              0.0 – 1.7*                1.7 – 3.6*      3.6 – 3.9DCP

        Notes:    1.        Depths noted in m BGL at time of investigation (19 January 2026)
                  2.        * inferred from DCP testing
                  3.        DCP
                                denotes DCP termination depth




        Geotechnical Investigation
        30 January 2026 | 25408-001-Rev0                                                                                                      6
Document Set ID: 25158026
                  24528612
Version: 1,
         2, Version Date: 10/09/2026
                          13/02/2026