Reference Document - MCU24/0002 [As Published]

                  Qualtest Geotechnics Slope Stability Assessment Tool – Hargreaves & Kidd (2012)

                                      Slope Hazard Rating at 399 Sunrise Road, Tinbeerwah QLD

             Grade       (1) Natural Surface                 Level      Factor   Grade   (8) Cut Depth               Level   Factor
                         Conditions                                                      No cut existing nor         L       0.9
                         <5                                  L          0.1              proposed
                         50 to 150                           M          0.5              <1m                         M       1.1
             ✓           150 to 300                          M          0.8      ✓       1 to 3m                     M       1.5
                         300 to 450                          H          0.8              3 to 6m                     H       1.7
                         > 450                               M          0.8              >6m                         VH      2.5


                         (2) Slope Shape/Appearance          Level      Factor   Grade   (9) Cut batter angle        Level   Factor
                         Crest or ridge                      L          0.7      ✓       <30o                        L       0.5
             ✓           Planar/convex                       M          0.9              30o to 45o                  M       1.0
                         Rough/irregular                     H          1.2              45o to 60o                  M       1.5
                         Concave                             H          1.5              >60o                        VH      3.0


             Grade     (3) Site Geology                      Level      Factor   Grade   (10) Cut Batter Support     Level   Factor
                       Problematical geological              VH         1.5
                                                                                         Engineered concrete /       L       0.5
                       boundary
                                                                                         masonry wall
                       Volcanic extrusive (basalts etc)      H          1.2
                                                                                         Engineered crib wall        M       0.9
                       Volcanic intrusive (granites etc)     M          1.0
             ✓         Sedimentary rocks                     M          1.0              V gabion wall               M       1.0
                       Low-grade metamorphic rocks           M          1.0              Engineered dry rock stack   H       1.2
                       High-grade metamorphic rocks          L          0.9              wall
                       Hill wash (recent colluvial)          VH         2.0      ✓       Engineered post and wale    H       1.5
                                                                                         wall
                                                                                         Other (including non-       VH      2.0
             Grade     (4) Soil Profile                      Level      Factor           engineered)
                       Bedrock as surface                    VL         0.1
                       Residual Soil – bedrock < 1m          L          0.5
                       Residual Soil – bedrock 1 to 3m       M          0.9      Grade   (11) Fill                   Level   Factor
             ✓         Residual Soil – bedrock > 3m          H          1.5              No fill – existing nor      L       0.9
                       Transported Soil - < 1m deep          H          1.5              proposed
                       Transported Soil - 1 to 3m deep       VH         2.0              <1m                         M       1.1
                       Transported Soil – 3 to 6m deep       VH         4.0      ✓       1 to 3m                     M       1.5
                       Transported Soil - > 6m deep          VH         2.0
                                                                                         3 to 6m                     H       1.7
                                                                                         >6m                         VH      2.5
             Grade     (5) Regional Position on              Level      Factor
                       Hillside (refer AS4055-2066)
                       Ridgeline                             VL         0.7      Grade   (12) Fill Batter Angle      Level   Factor
                       Crest                                 L          0.8
                       Upper 1/3 of slope                    M          0.9      ✓       <30                         L       0.5
             ✓         Mid 1/3 of slope                      H          1.2              30o to 45o                  H       1.2
                       Lower 1/3 of slope                    H          1.5              45o to 60o                  VH      2.0
                                                                                         >60o                        VH      4.0

             Grade     (6) Evidence of Groundwater           Level      Factor
             ✓         No evidence                           L          0.7
                                                                                 Grade   (13) Fill Batter Support    Level   Factor
                       Minor moistness                       M          0.9
                                                                                         Engineered concrete /       L       0.8
                       Generally wet                         H          1.5
                                                                                         masonry wall
                       Evidence of spring                    VH         3.0
                                                                                         Engineered crib wall        M       1.0
                       Do not know                           VH         4.0
                                                                                         V gabion wall               H       1.2
                                                                                         Engineered dry rock stack   VH      1.5
             Grade     (7) Evidence of Slope                 Level      Factor           wall
                       Instability                                               ✓       Engineered post and wale    V       1.8
                       No sign of instability                L          0.8              wall
             ✓         Indicators of soil creep              H          1.2              Other (including non-       VH      4.0
                                                                                         engineered)
                       Minor irregularity                    VH         2.0
                       Major irregularity                    VH         5.0
                       Active instability                    VH         10.0
                       Don’t know                            VH         15.0
              Pre Construction Output = 0.8x0.9x1.0x1.5x1.2x0.7x1.2 =   1.09
Document Set ID: 22750694
Version: 1, Version Date: 03/01/2024