Attachment 3 - Revised Slope Stability Assessment

                                                                                                                                                                                                                                                                                                                                                                                                                                         Borehole No.

                                                                                                                                                                                                                                                                                                                                                                                                                                               BH2
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                                                                                                                                                                                                            Engineering Log - Borehole                                                                                                                                 Project No.:                       22328

                                                                                                                                                                                                                 Client:                                  Brett Hage                                                                                                   Commenced:                         19/8/2022
                                                                                                                                                                                                                 Project Name:                            Proposed Subdivision                                                                                         Completed:                         19/8/2022
                                                                                                                                                                                                                 Hole Location:                           96 Black Mountain Range Road, Black Mountain                                                                 Logged By:                         LM
                                                                                                                                                                                                                 Hole Position:                           486544.9 m E 7079377.0 m N MGA2020 Zone 56                                                                   Checked By:                        RKG
                                                                                                                                                                                                                 Drill Model and Mounting:                                4WD Auger                                                   Inclination: -90°                RL Surface:                No survey
                                                                                                                                                                                                                 Hole Diameter:                                           100 mm                                                      Bearing:     360°                Datum:                     AHD             Operator:         Tectonic

                                                                                                                                                                                                                                    Drilling Information                                                                                             Material Description and Observations




                                                                                                                                                                                                                                                                                                                                                                               Relative Density
                                                                                                                                                                                                                                                                                                       Classification
                                                                                                                                                                                                                                                                                                                                                                                                     Pocket                         DCP TEST
                                                                                                                                                                                                                     Penetration




                                                                                                                                                                                                                                                                                                                                                                               Consistency
                                                                                                                                                                                                                                                                                         Graphic Log


                                                                                                                                                                                                                                                     Samples                                                                            Material Description                                                                   (AS 1289.6.3.2-1997)
                                                                                                                                                                                                                                                                                                                                                                                                  Penetrometer
                                                                                                                                                                                                                                                               Recovery




                                                                                                                                                                                                                                                                                                                                                                               Condition
                                                                                                                                                                                                                                                      Tests                                                               soil type: plasticity or particle characteristics,




                                                                                                                                                                                                                                                                                                                                                                               Moisture
                                                                                                                                                                                                                                                                                                                                                                                                      UCS                       Blows per 100 mm
                                                                                                                                                                                                                                                                                                       Symbol
                                                                                                                                                                                                            Method




                                                                                                                                                                                                                                                     Remarks                                                               secondary and minor components, colour
                                                                                                                                                                                                                                   Water




                                                                                                                                                                                                                                                                           RL    Depth                                                                                                               (kPa)
                                                                                                                                                                                                                                                                           (m)    (m)                                                                                                                             0       5        10     15     20    25




                                                                                                                                                                                                                                                                                                                                                                                                  100
                                                                                                                                                                                                                                                                                                                                                                                                  200
                                                                                                                                                                                                                                                                                                                                                                                                  300
                                                                                                                                                                                                                                                                                                                                                                                                  400
                                                                                                                                                                                                                                                                                                                                                                                                  500
                                                                                                                                                                                                                                                                                                         CH             Silty CLAY, high plasticity, pale brown, with
                                                                                                                                                                                                                                                                                                                        medium to coarse sized gravel and fine grained
                                                                                                                                                                                                                                                                                                                        sand (RESIDUAL)
                                                                                                                                                                                                                                                                                                         CH             Silty CLAY, high plasticity, pale brown                                     180




                                                                                                                                                                                                                                                                                                                                                                                        St to
                                                                                                                                                                                                                                                                                                                        becoming friable                                         M
                                                                                                                                                                                                                                                                                                                                                                                        VSt



                                                                                                                                                                                                                                                                                   1



                                                                                                                                                                                                                                                                                                                        Silty Gravelly CLAY, medium to high plasticity,
                                                                                                                                                                                                                                                                                                                        pale grey brown, fine to coarse size gravel, trace
                                                                                                                                                                                                                                                                                                                        fine grained sand (XW MATERIAL)                                                               Augered to 1.6m
TECTONIC 3.00.2 LIB.GLB Log 1 TECTONIC BOREHOLE 22328.GPJ <<DrawingFile>> 13/9/2022 16:40 10.02.00.04 Datgel Lab and In Situ Tool - DGD | Lib: Tectonic 3.00.2 2021-03-30 Prj: Tectonic 3.00.2 2021-03-30




                                                                                                                                                                                                                                   Not Encountered




                                                                                                                                                                                                                                                                                   2
                                                                                                                                                                                                                                                                                                         CH             becoming grey brown mottled orange
                                                                                                                                                                                                                                                                                                                                                                               D to VSt to                            Augered to 2.7m
                                                                                                                                                                                                                                                                                                                                                                                M    H
                                                                                                                                                                                                            AD/T




                                                                                                                                                                                                                                                                                                                                                                                                                      20/100mm
                                                                                                                                                                                                                                                                                   3
                                                                                                                                                                                                                                                                                                                        META-MUDSTONE, distinctly weathered, very                                                     Refusal
                                                                                                                                                                                                                                                                                                                        low strength (recovered as dry, grey silt)




                                                                                                                                                                                                                                                                                   4



                                                                                                                                                                                                                                                                                                                        grading to low stregth

                                                                                                                                                                                                                                                                                                                        Hole Terminated at 4.50 m
                                                                                                                                                                                                                                                                                                                        Auger Drilling Refusal




                                                                                                                                                                                                                      Method                                        Penetration                                         Water                     Samples and Tests                        Moisture Condition                 Consistency/Relative Density
                                                                                                                                                                                                                 AD/T-Auger Drilling TC Bit                                  VE - Very Easy         Level (Date)                           U## - Undisturbed Sample (## mm)                    D - Dry                           VS - Very Soft
                                                                                                                                                                                                                 AD/V-Auger Drilling V Bit                                   E - Easy                                                      DS - Disturbed Sample                               M - Moist                         S - Soft
                                                                                                                                                                                                                 RT - Rotary Tri-cone Bit                                                           Inflow                                 BDS - Bulk Disturbed Sample                         W - Wet                           F    - Firm
                                                                                                                                                                                                                 RD - Rotary Drilling                                        F - Firm                                                      SPT - Standard Penetration Test                                                       VSt - Very Stiff
                                                                                                                                                                                                                                                                                                    Partial Loss
                                                                                                                                                                                                                 NMLC -Rock Core                                             H - Hard                                                                                                                                            H - Hard
                                                                                                                                                                                                                                                                             VH - Very hard        Complete Loss
                                                                                                                                                                                                                 HA - Hand Auger                                                                                                                                                                  Plastic Limit                  VL - Very Loose
                                                                                                                                                                                                                                                                           Graphic Log/Core Loss                                                                                                                                 L    - Loose
                                                                                                                                                                                                                                                                                                                                               Classification Symbols and                            < PL                        MD - Medium Dense
                                                                                                                                                                                                                                                                              Core recovered (hatching                                              Soil Descriptions
                                                                                                                                                                                                                                                                              indicates material)                                                                                                    = PL                        D - Dense
                                                                                                                                                                                                                                                                                                                                                  Based on Unified Soil                              < PL                        VD - Very Dense
                                                                                                                                                                                                                                                                              Core loss                                                                                                                                          Fr - Friable
                                                                                                                                                                                                                                                                                                                                                  Classification System