Reference Document - MCU24/0143 (As Published)

        Although no design drawings were provided, based on a visual appraisal the existing cabins comprised
        two trailer mounted ‘tiny homes’, both of which had timber decking extending off the eastern edges.
        The decks appeared to be permanently fixed to the ground via piled footings, whereas the trailer
        mounted cabins were sited on gravel hardstand areas. Ancillary structures included water tanks, raised
        garden beds and effluent disposal units.
        Access to the existing cabins was via an asphalt driveway which extended into the site in the north-
        eastern corner. Both cabins were situated on relatively level cut and fill platforms, with previous cut to fill
        earthworks estimated to range up to about 1 m deep and 1.5 m high, respectively.
        Text Figure 2 below illustrates the existing cabins at the time of the site visits.




                                       Text Figure 2: Typical views of the existing cabins

        1.2         Method and Scope of Investigation
        As part of our slope stability assessment, a desk-top study was carried out comprising a review of
        published geological maps and slope stability studies. An initial walk-over survey was conducted by an
        experienced geotechnical engineer from Tectonic on 21 November 2024 in order to make an appraisal of
        the general condition of the site in regard to topography, drainage, vegetation cover, geology, erosion
        and condition of existing structures.
        As several signs of both historic and recent landslide activity were observed, a geotechnical investigation
        was carried out to assess the ground conditions on 21 January 2025. The investigation comprised the
        excavation of four test pits (designated TP1 to TP4) around the tiny homes to depths between 2.8 m and
        5.5 m below ground level (BGL). Test pits were excavated using a 5.5 tonne excavator owned and
        operated by Bebrok Excavations, generally with toothed buckets and ripper attachments. A pendulum
        auger attachment and extensions also utilised in test pit TP2.
        Test pit logs and explanatory notes are attached to this report. Logging was carried out in accordance
        with Australian Standard AS1726 Geotechnical site investigations. The approximate test pit locations are
        shown in the Figure 1, also attached to this report. One soil sample was dispatched to a NATA
        accredited laboratory based in Birtinya, for geotechnical testing. Laboratory testing was undertaken in
        accordance with Australian Standard AS1289 Methods for Testing Soils for Engineering Purposes and
        comprised one Atterberg Limits and Particle Size Distribution test for soil classification purposes. The
        laboratory report is also attached.




        4 June 2025
        24378-001-Rev1                                                                                         2 of 12
Document Set ID: 24125427
                  24010296
Version: 1, Version Date: 17/09/2025
                          07/08/2025