Reference Document - MCU24/0143 (As Published)

              blocks less than 300 mm across, with the relict bedding generally dipping with the direction of the
              slope at about 20 to 30 degrees.
        During the investigation it was noted that the sidewalls in test pit TP1 (excavated above an existing
        landslide backscarp) were collapsing between about 0.3 m and 2 m BGL (in the colluvial materials), which
        can be indicative of low shear strengths.
        Laboratory testing indicated that the sample from test pit TP1 between 0.8 m and 1.2 m BGL was a
        gravelly clay of high plasticity, tending towards a silt. The laboratory test certificate is attached.

        2.2         Topography
        During the site walk-overs, topographic features specific to the site were noted, and ground slopes were
        recorded using a hand-held clinometer. As shown in Text Figure 5 overleaf, the site is dominated by
        three southerly dipping ridgelines, all of which emanate off a ridge crest approximately traced by Black
        Mountain Road to the north. Drainage lines between the ridges feed into a creek in the lower lying
        ground in the southern part of the site. Concave shaped ground was present around the natural
        drainage lines and near gully heads.
        The existing cabins are situated below a saddle, on the easterly facing flank of a ridge which roughly
        follows the western boundary. Although the ground surface around the cabins was somewhat convex in
        shape, drainage lines and concave shaped ground was present to the north and south.
        Both tiny homes were situated on relatively level earthworks platforms. Based on a visual appraisal it
        appeared that cut and fill earthworks in the order of about 1 m deep and 1.5 m high had been
        undertaken, with batters typically dipping between about 15° and 25°. Previous earthworks had also
        been undertaken around the site to construct the existing driveway and walking tracks, estimated to
        range up to about 2 m depth/height.
        Gradients around the cabin area typically varied between about 10° and 15°, which increased to between
        about 20° and 30° progressing eastwards. Steeper gradients were observed in drainage lines in the
        north-western part of the site. The existing driveways and track cuttings around the cabin area were
        battered between 40° and 60°, sometimes showing evidence of scouring and slumping.




                                       Text Figure 4: Typical views of track and driveway cuttings




        4 June 2025
        24378-001-Rev1                                                                                       4 of 12
Document Set ID: 24125427
                  24010296
Version: 1, Version Date: 17/09/2025
                          07/08/2025