Reference Document - MCU24/0002 [As Published]

                                                                                                           Job No: 23-458
                                                                                                                   Page 7

                  2.4 Geotechnical Site Walkover

                  A site inspection was undertaken to confirm the geological, geomorphology, fill conditions, and to assess
                  the likely hazard rating based on site features that contribute to the initiation of a landslide.

                  The slope stability walkover assessment was undertaken on October 17, 2023.

                  A site report and frequency analysis were undertaken during the visit. The site report is a standard form
                  that identifies the site features that contribute to the occurrence of a landslide.

                  The major site features relevant to this assessment for natural and man-made slopes are:

                       1. Slope Angle: In general, the steeper the average surface slope angle, the higher the risk of
                          slope instability. Slope angles were directly measured onsite as well as calculated based on the
                          detailed survey plan;

                       2. Slope Shape and Features: The shape of the slope provides an indication of the method of
                          slope development and the materials below the surface. Concave shapes often indicate past
                          movements;

                       3. Engineering Properties of Sub-surface Materials: The engineering properties of the materials
                          forming the subsurface profile contribute to the risk of slope instability. Most slope failures occur
                          in soil-strength material, and deeper soils increase the likelihood of slope failure.

                       4. The Concentration of Surface/Ground Water: Water is one of the most important factors in
                          landslides' occurrence. The majority of slope failures occur during or following rainfall events
                          when there is a combination of surface erosion and saturation of subsurface materials. The
                          concentration of Groundwater: The presence of a high groundwater table can provide a similar
                          long-term situation to a rainfall event and contribute to slope failure without a major rainfall event;

                       5. Evidence of Instability: In many cases, slope failures occur due to the reactivation of previous
                          landslides. The presence of features that indicate past slope instability provides evidence that
                          could initiate future slope movement;

                       6. Regional position on a hillside; and

                       7. Site geology

                       8. Cut depth;
                       9. Cut batter angle;
                       10. Cut batter support;
                       11. Fill depth;
                       12. Fill batter angle;
                       13. Fill Batter Support;
                       14. Type of fill;
                       15. Wastewater, sewerage, etc;
                       16. Stormwater disposal;
                       17. Expandable/mechanical stormwater and drainage pipe connectors;
                       18. Footing system;
                       19. The foundation strata;
                       20. In-ground tanks (any type); and
                       21. Landscaping.

                  Additional observations onsite include:

                       •    Minor distress of a small section of the block retaining wall;
                       •    No groundwater or seepage was observed throughout the site;

                                                                                                                   Ref: 4602
                                                                                              399 Sunrise Road, Tinbeerwah
Document Set ID: 22750694
Version: 1, Version Date: 03/01/2024